7.0.1.0

* ntf server: shard push workers per notification token

* ntf server: inline push worker shard calculation

.github/CODEOWNERS

@@ -1 +1,4 @@
-* @epoberezkin @efim-poberezkin
+* @epoberezkin @spaced4ndy
+/Dockerfile @shumvgolove
+/scripts/docker/ @shumvgolove
+/scripts/main/ @shumvgolove

.github/actions/swap/action.yml

@@ -0,0 +1,44 @@
+name: 'Set Swap Space'
+description: 'Add moar swap'
+branding:
+  icon: 'crop'
+  color: 'orange'
+inputs:
+  swap-size-gb:
+    description: 'Swap space to create, in Gigabytes.'
+    required: false
+    default: '10'
+runs:
+  using: "composite"
+  steps:
+    - name: Swap space report before modification
+      shell: bash
+      run: |
+        echo "Memory and swap:"
+        free -h
+        echo
+        swapon --show
+        echo
+    - name: Set Swap
+      shell: bash
+      run: |
+          export SWAP_FILE=$(swapon --show=NAME | tail -n 1)
+          echo "Swap file: $SWAP_FILE"
+          if [ -z "$SWAP_FILE" ]; then
+            SWAP_FILE=/opt/swapfile
+          else
+            sudo swapoff $SWAP_FILE
+            sudo rm $SWAP_FILE
+          fi
+          sudo fallocate -l ${{ inputs.swap-size-gb }}G $SWAP_FILE
+          sudo chmod 600 $SWAP_FILE
+          sudo mkswap $SWAP_FILE
+          sudo swapon $SWAP_FILE
+    - name: Swap space report after modification
+      shell: bash
+      run: |
+        echo "Memory and swap:"
+        free -h
+        echo
+        swapon --show
+        echo

.github/workflows/build.yml

@@ -10,38 +10,27 @@ on:
   pull_request:
 
 jobs:
-  build:
-    runs-on: ubuntu-20.04
+
+# =============================
+#       Create release
+# =============================
+
+# Create release, but only if it's triggered by tag push.
+# On pull requests/commits push, this job will always complete.
+
+  maybe-release:
+    runs-on: ubuntu-latest
     steps:
       - name: Clone project
-        uses: actions/checkout@v2
-
-      - name: Setup Stack
-        uses: haskell/actions/setup@v1
+        if: startsWith(github.ref, 'refs/tags/v')
+        uses: actions/checkout@v3
         with:
-          ghc-version: "8.10.7"
-          enable-stack: true
-          stack-version: "latest"
-
-      - name: Cache dependencies
-        uses: actions/cache@v2
-        with:
-          path: ~/.stack
-          key: ${{ hashFiles('stack.yaml') }}
-
-      - name: Build & test
-        id: build_test
-        shell: bash
-        run: |
-          stack build --test --force-dirty
-          install_root=$(stack path --local-install-root)
-          mv ${install_root}/bin/smp-server smp-server-ubuntu-20_04-x86-64
-          mv ${install_root}/bin/ntf-server ntf-server-ubuntu-20_04-x86-64
+          submodules: recursive
 
       - name: Build changelog
-        if: startsWith(github.ref, 'refs/tags/v')
         id: build_changelog
-        uses: mikepenz/release-changelog-builder-action@v1
+        if: startsWith(github.ref, 'refs/tags/v')
+        uses: simplex-chat/release-changelog-builder-action@v5
         with:
           configuration: .github/changelog_conf.json
           failOnError: true
@@ -50,31 +39,265 @@ jobs:
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
-      - name: Extract release candidate
-        if: startsWith(github.ref, 'refs/tags/v')
-        id: extract_release_candidate
-        shell: bash
-        run: |
-          if [[ ${GITHUB_REF} == *rc* ]]; then
-            echo "::set-output name=release_candidate::true"
-          else
-            echo "::set-output name=release_candidate::false"
-          fi
-
       - name: Create release
         if: startsWith(github.ref, 'refs/tags/v')
-        uses: softprops/action-gh-release@v1
+        uses: simplex-chat/action-gh-release@v2
         with:
           body: |
             See full changelog [here](https://github.com/simplex-chat/simplexmq/blob/master/CHANGELOG.md).
 
             Commits:
             ${{ steps.build_changelog.outputs.changelog }}
-          prerelease: ${{ steps.extract_release_candidate.outputs.release_candidate }}
+          prerelease: true
           files: |
             LICENSE
-            smp-server-ubuntu-20_04-x86-64
-            ntf-server-ubuntu-20_04-x86-64
           fail_on_unmatched_files: true
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+# =============================
+#        Main build job
+# =============================
+
+  build:
+    name: "ubuntu-${{ matrix.os }}-${{ matrix.arch }}, GHC: ${{ matrix.ghc }}"
+    needs: maybe-release
+    env:
+      apps: "smp-server xftp-server ntf-server xftp"
+    runs-on: ${{ matrix.runner }}
+    services:
+      postgres:
+        image: postgres:15
+        env:
+          POSTGRES_HOST_AUTH_METHOD: trust # Allows passwordless access
+        options: >-
+          --health-cmd pg_isready
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
+        ports:
+          # Maps tcp port 5432 on service container to the host
+          - 5432:5432
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - os: 22.04
+            os_underscore: 22_04
+            arch: x86-64
+            runner: "ubuntu-22.04"
+            ghc: "8.10.7"
+            should_run: ${{ !(github.ref == 'refs/heads/stable' || startsWith(github.ref, 'refs/tags/v')) }}
+          - os: 22.04
+            os_underscore: 22_04
+            arch: x86-64
+            runner: "ubuntu-22.04"
+            ghc: "9.6.3"
+            should_run: true
+          - os: 24.04
+            os_underscore: 24_04
+            arch: x86-64
+            runner: "ubuntu-24.04"
+            ghc: "9.6.3"
+            should_run: true
+          - os: 22.04
+            os_underscore: 22_04
+            arch: aarch64
+            runner: "ubuntu-22.04-arm"
+            ghc: "9.6.3"
+            should_run: true
+          - os: 24.04
+            os_underscore: 24_04
+            arch: aarch64
+            runner: "ubuntu-24.04-arm"
+            ghc: "9.6.3"
+            should_run: true
+    steps:
+      - name: Clone project
+        if: matrix.should_run == true
+        uses: actions/checkout@v3
+        with:
+          submodules: recursive
+
+      - name: Set up Docker Buildx
+        if: matrix.should_run == true
+        uses: simplex-chat/docker-setup-buildx-action@v3
+
+      - name: Setup swap
+        if: matrix.ghc == '8.10.7' && matrix.should_run == true
+        uses: ./.github/actions/swap
+        with:
+          swap-size-gb: 20
+
+      - name: Install PostgreSQL 15 client tools
+        if: matrix.os == '22.04' && matrix.should_run == true
+        shell: bash
+        run: |
+          # Import the repository signing key
+          sudo install -d /usr/share/postgresql-common/pgdg
+          sudo curl -o /usr/share/postgresql-common/pgdg/apt.postgresql.org.asc --fail https://www.postgresql.org/media/keys/ACCC4CF8.asc
+          # Add the PostgreSQL APT repository
+          sudo sh -c 'echo "deb [signed-by=/usr/share/postgresql-common/pgdg/apt.postgresql.org.asc] https://apt.postgresql.org/pub/repos/apt $(lsb_release -cs)-pgdg main" > /etc/apt/sources.list.d/pgdg.list'
+          # Update repository and install postgresql tools
+          sudo apt update
+          sudo apt -y install postgresql-client-15
+
+      - name: Build and cache Docker image
+        if: matrix.should_run == true
+        uses: simplex-chat/docker-build-push-action@v6
+        with:
+          context: .
+          load: true
+          file: Dockerfile.build
+          tags: build/${{ matrix.os }}:latest
+          build-args: |
+            TAG=${{ matrix.os }}
+            GHC=${{ matrix.ghc }}
+
+      - name: Cache dependencies
+        if: matrix.should_run == true
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cabal/store
+            dist-newstyle
+          key: ubuntu-${{ matrix.os }}-${{ matrix.arch }}-ghc${{ matrix.ghc }}-${{ hashFiles('cabal.project', 'simplexmq.cabal') }}
+
+      - name: Start container
+        if: matrix.should_run == true
+        shell: bash
+        run: |
+          docker run -t -d \
+            --device /dev/fuse \
+            --cap-add SYS_ADMIN \
+            --security-opt apparmor:unconfined \
+            --name builder \
+            -v ~/.cabal:/root/.cabal \
+            -v /home/runner/work/_temp:/home/runner/work/_temp \
+            -v ${{ github.workspace }}:/project \
+            build/${{ matrix.os }}:latest
+
+      - name: Build smp-server, xftp-server (postgresql) and tests
+        if: matrix.should_run == true
+        shell: docker exec -t builder sh -eu {0}
+        run: |
+          chmod -fR 777 ~/.cabal ./dist-newstyle || :; git config --global --add safe.directory '*'
+          cabal clean
+          cabal update
+          cabal build --jobs=$(nproc) --enable-tests -fserver_postgres
+          mkdir -p /out
+          for i in smp-server xftp-server simplexmq-test; do
+            bin=$(find /project/dist-newstyle -name "$i" -type f -executable)
+            chmod +x "$bin"
+            mv "$bin" /out/
+          done
+          strip /out/smp-server /out/xftp-server
+
+      - name: Copy simplexmq-test from container
+        if: matrix.should_run == true
+        shell: bash
+        run: |
+          docker cp builder:/out/simplexmq-test .
+
+      - name: Copy smp-server, xftp-server (postgresql) from container and prepare it
+        if: startsWith(github.ref, 'refs/tags/v') && matrix.should_run == true
+        id: prepare-postgres
+        shell: bash
+        run: |
+          printf 'bins<<EOF\n' > bins.output
+          printf 'hashes<<EOF\n' > hashes.output
+
+          for i in smp-server xftp-server; do
+            name="${i}-postgres-ubuntu-${{ matrix.os_underscore }}-${{ matrix.arch }}"
+            docker cp builder:/out/$i $name
+
+            path="${{ github.workspace }}/$name"
+            hash="SHA2-256($name)= $(openssl sha256 $path | cut -d' ' -f 2)"
+
+            printf '%s\n' "$path" >> bins.output
+            printf '%s\n\n' "$hash" >> hashes.output
+          done
+          printf 'EOF\n' >> bins.output
+          printf 'EOF\n' >> hashes.output
+
+          cat bins.output >> "$GITHUB_OUTPUT"
+          cat hashes.output >> "$GITHUB_OUTPUT"
+
+      - name: Build everything else (standard)
+        if: matrix.should_run == true
+        shell: docker exec -t builder sh -eu {0}
+        run: |
+          cabal build --jobs=$(nproc)
+          mkdir -p /out
+          for i in ${{ env.apps }}; do
+            bin=$(find /project/dist-newstyle -name "$i" -type f -executable)
+            strip "$bin"
+            chmod +x "$bin"
+            mv "$bin" /out/
+          done
+
+      - name: Copy binaries from container and prepare them
+        id: prepare-regular
+        if: startsWith(github.ref, 'refs/tags/v') && matrix.should_run == true
+        shell: bash
+        run: |
+          docker cp builder:/out .
+
+          printf 'bins<<EOF\n' > bins.output
+          printf 'hashes<<EOF\n' > hashes.output
+          for i in ${{ env.apps }}; do
+            name="$i-ubuntu-${{ matrix.os_underscore }}-${{ matrix.arch }}"
+
+            mv ./out/$i ./$name
+
+            path="${{ github.workspace }}/$name"
+            hash="SHA2-256($name)= $(openssl sha256 $path | cut -d' ' -f 2)"
+
+            printf '%s\n' "$path" >> bins.output
+            printf '%s\n\n' "$hash" >> hashes.output
+          done
+          printf 'EOF\n' >> bins.output
+          printf 'EOF\n' >> hashes.output
+
+          cat bins.output >> "$GITHUB_OUTPUT"
+          cat hashes.output >> "$GITHUB_OUTPUT"
+
+      - name: Upload binaries
+        if: startsWith(github.ref, 'refs/tags/v') && matrix.should_run == true
+        uses: simplex-chat/action-gh-release@v2
+        with:
+          append_body: true
+          prerelease: true
+          fail_on_unmatched_files: true
+          body: |
+            ${{ steps.prepare-regular.outputs.hashes }}
+            ${{ steps.prepare-postgres.outputs.hashes }}
+          files: |
+            ${{ steps.prepare-regular.outputs.bins }}
+            ${{ steps.prepare-postgres.outputs.bins }}
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Test
+        if: matrix.should_run == true && matrix.arch == 'x86-64'
+        timeout-minutes: 120
+        shell: bash
+        env:
+          PGHOST: localhost
+        run: |
+          i=1
+          attempts=1
+          ${{ (github.ref == 'refs/heads/stable' || startsWith(github.ref, 'refs/tags/v')) }} && attempts=3
+          while [ "$i" -le "$attempts" ]; do
+            if ./simplexmq-test; then
+              break
+            else
+              echo "Attempt $i failed, retrying..."
+              i=$((i + 1))
+              sleep 1
+            fi
+          done
+          if [ "$i" -gt "$attempts" ]; then
+            echo "All "$attempts" attempts failed."
+            exit 1
+          fi

.github/workflows/docker-image.yml

@@ -0,0 +1,60 @@
+name: Build and push Docker image to Docker Hub
+
+on:
+  push:
+    tags:
+      - "v*"
+
+jobs:
+  build-and-push:
+    name: Build and push Docker image
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - app: smp-server
+            app_port: "443 5223"
+          - app: xftp-server
+            app_port: 443
+    steps:
+      - name: Clone project
+        uses: actions/checkout@v4
+        with:
+          submodules: recursive
+
+      - name: Log in to Docker Hub
+        uses: simplex-chat/docker-login-action@v3
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_PASSWORD }}
+
+      - name: Extract metadata for Docker image
+        id: meta
+        uses: simplex-chat/docker-metadata-action@v5
+        with:
+          images: ${{ secrets.DOCKERHUB_USERNAME }}/${{ matrix.app }}
+          flavor: |
+            latest=auto
+          tags: |
+            type=semver,pattern=v{{version}}
+            type=semver,pattern=v{{major}}.{{minor}}
+            type=semver,pattern=v{{major}}
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Build and push Docker image
+        uses: simplex-chat/docker-build-push-action@v6
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm64
+          push: true
+          build-args: |
+            APP=${{ matrix.app }}
+            APP_PORT=${{ matrix.app_port }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

.github/workflows/reproduce-schedule.yml

@@ -0,0 +1,47 @@
+name: Reproduce latest release
+
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: '0 2 * * *' # every day at 02:00 night
+
+jobs:
+  reproduce:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+        with:
+          submodules: recursive
+
+      - name: Get latest release
+        shell: bash
+        run: |
+          curl --proto '=https' \
+               --tlsv1.2 \
+               -sSf -L \
+               'https://api.github.com/repos/simplex-chat/simplexmq/releases/latest' \
+               2>/dev/null | \
+          grep -i "tag_name" | \
+          awk -F \" '{print "TAG="$4}' >> $GITHUB_ENV
+
+      - name: Execute reproduce script
+        run: |
+          ${GITHUB_WORKSPACE}/scripts/simplexmq-reproduce-builds.sh "$TAG" || :
+
+      - name: Check if build has been reproduced
+        env:
+          url: ${{ secrets.STATUS_SIMPLEX_WEBHOOK_URL }}
+          user: ${{ secrets.STATUS_SIMPLEX_WEBHOOK_USER }}
+          pass: ${{ secrets.STATUS_SIMPLEX_WEBHOOK_PASS }}
+        run: |
+          if [ -f "${GITHUB_WORKSPACE}/${TAG}-simplexmq/_sha256sums" ]; then
+            exit 0
+          else
+            curl --proto '=https' --tlsv1.2 -sSf \
+              -u "${user}:${pass}" \
+              -H 'Content-Type: application/json' \
+              -d '{"title": "👾 GitHub: Runner", "description": "⛔️ '"$TAG"' did not reproduce."}' \
+              "$url"
+            exit 1
+          fi

.gitignore

@@ -5,4 +5,10 @@
 tests/tmp
 dist-newstyle/
 
-src/tor
+cabal.project.local
+cabal.project.local~
+
+.hpc/
+*.tix
+.coverage
+

.gitmodules

@@ -0,0 +1,6 @@
+[submodule "cbits/libbbs"]
+	path = cbits/libbbs
+	url = https://github.com/simplex-chat/libbbs.git
+[submodule "cbits/blst"]
+	path = cbits/blst
+	url = https://github.com/supranational/blst.git

.hlint.yaml

@@ -0,0 +1 @@
+- ignore: {name: "Use underscore"}

2026-02-04-xftp-web-persistent-connections.md

@@ -0,0 +1,53 @@
+# XFTPClientAgent Pattern
+
+## TOC
+1. Executive Summary
+2. Changes: client.ts
+3. Changes: agent.ts
+4. Changes: test/browser.test.ts
+5. Verification
+
+## Executive Summary
+
+Add `XFTPClientAgent` — a per-server connection pool matching the Haskell pattern. The agent caches `XFTPClient` instances by server URL. All orchestration functions (`uploadFile`, `downloadFile`, `deleteFile`) take `agent` as first parameter and use `getXFTPServerClient(agent, server)` instead of calling `connectXFTP` directly. Connections stay open on success; the caller creates and closes the agent.
+
+`connectXFTP` and `closeXFTP` stay exported (used by `XFTPWebTests.hs` Haskell tests). The `browserClients` hack, per-function `connections: Map`, and `getOrConnect` are deleted.
+
+## Changes: client.ts
+
+**Add** after types section: `XFTPClientAgent` interface, `newXFTPAgent`, `getXFTPServerClient`, `closeXFTPServerClient`, `closeXFTPAgent`.
+
+**Delete**: `browserClients` Map and all `isNode` browser-cache checks in `connectXFTP` and `closeXFTP`.
+
+**Revert `closeXFTP`** to unconditional `c.transport.close()` (browser transport.close() is already a no-op).
+
+`connectXFTP` stays exported (backward compat) but becomes a raw low-level function — no caching.
+
+## Changes: agent.ts
+
+**Imports**: replace `connectXFTP`/`closeXFTP` with `getXFTPServerClient`/`closeXFTPAgent` etc.
+
+**Re-export** from agent.ts: `newXFTPAgent`, `closeXFTPAgent`, `XFTPClientAgent`.
+
+**`uploadFile`**: add `agent: XFTPClientAgent` as first param. Replace `connectXFTP` → `getXFTPServerClient`. Remove `finally { closeXFTP }`. Pass `agent` to `uploadRedirectDescription`.
+
+**`uploadRedirectDescription`**: change from `(client, server, innerFd)` to `(agent, server, innerFd)`. Get client via `getXFTPServerClient`.
+
+**`downloadFile`**: add `agent` param. Delete local `connections: Map`. Replace `getOrConnect` → `getXFTPServerClient`. Remove finally cleanup. Pass `agent` to `downloadWithRedirect`.
+
+**`downloadWithRedirect`**: add `agent` param. Same replacements. Remove try/catch cleanup. Recursive call passes `agent`.
+
+**`deleteFile`**: add `agent` param. Same pattern.
+
+**Delete**: `getOrConnect` function entirely.
+
+## Changes: test/browser.test.ts
+
+Create agent before operations, pass to upload/download, close in finally.
+
+## Verification
+
+1. `npx vitest --run` — browser round-trip test passes
+2. No remaining `browserClients`, `getOrConnect`, or per-function `connections: Map` locals
+3. `connectXFTP` and `closeXFTP` still exported (XFTPWebTests.hs compat)
+4. All orchestration functions take `agent` as first param

CHANGELOG.md

@@ -1,3 +1,718 @@
+# 6.5.1
+
+Version 6.5.1.0
+
+XFTP client:
+- backwards compatible file header decoding.
+
+# 6.5.0
+
+Version 6.5.0.17
+
+SMP agent:
+- improve subscriptions
+  - reduce memory usage and retries during initial subscription (#1758)
+  - fix race resulting in pending subscriptions never subscribed (#1756)
+  - batch processing of subscription results and errors (#1652)
+  - reduce memory usage of active subscriptions.
+- drop message after N reception attempts (#1762)
+- fix possible deadlocks of queue overloading when processing messages (#1713)
+- improved APIs for short link management and creation.
+- support multiple link owners in link data (#1701)
+
+SMP server:
+- store messages in PostgreSQL (#1622).
+- reduce memory usage with PostgreSQL database - do not use queue cache (#1637)
+- fix in-memory server not restoring queue/service associations after 2+ restarts (#1618)
+
+XFTP server:
+- support PostgreSQL database.
+- add server page.
+- support uploads from web clients.
+
+Servers:
+- better socket leak prevention during TLS handshake, NetworkError type to bette diagnose connection errors (#1619)
+- use "=" as default INI key-value separator (#1767)
+
+# 6.4.4
+
+Servers:
+- fix server pages when source code is not specified.
+- include commit SHA in printed version and in web page (#1608).
+
+SMP server:
+- support short SimpleX addresses in server information page (#1600).
+- wrap all queries in transactions (#1603).
+
+SMP agent:
+- chat relay address type for short links (#1602).
+- extend xrcp certificate validity 1 hour in the past, to allow out of sync clocks (#1601).
+
+# 6.4.3
+
+SMP agent:
+- fix some connection errors by updating contact request server hosts to match server in short link (#1597).
+
+SMP server:
+- support short link URI as queue identifier in control port commands (#1596).
+
+# 6.4.2
+
+SMP server:
+- fix memory leak when connection interrupts straight after client connects.
+- do not include repeated queue blocking into stats/quota.
+
+XFTP server:
+- prometheus metrics
+
+# 6.4.1
+
+SMP protocol:
+- create notification credentials via NEW command that creates the queue (#1586)
+
+SMP server:
+- control port session improvements (#1591)
+- additional stat counter for ntf credentials created together with the queue (#1589)
+
+# 6.4.0
+
+SMP protocol (server/client):
+- support associated queue data and short connection links (see [RFC](./rfcs/2025-03-16-smp-queues.md)).
+- service certificates to optimize subscriptions.
+
+SMP agent:
+- support retries for interactive connection handshakes.
+- use web port 443 by default for preset servers.
+- use static RNG function to avoid creating dynamic C stubs when generating sntrup keys (it was detected as Dynamic Code Loading in GrapheneOS).
+- different timeouts for interactive and background operations.
+
+Ntf server:
+- PostgreSQL storage.
+- Prometheus metrics.
+- use service certificates.
+- fix repeat token registration.
+
+# 6.3.2
+
+Servers:
+- enable store log by default (#1501).
+
+SMP server:
+- reduce memory usage (#1498)
+
+SMP agent:
+- handle client/agent version downgrades after connection was established (#1508).
+
+# 6.3.1
+
+Servers:
+- handle ECONNABORTED error on client connections.
+- reproducible builds.
+- blocking records for content moderation.
+- update script (simplex-servers-update) downloads scripts from the specified or the latest stable tag.
+
+SMP server:
+- support for PostgreSQL database for queue records for higher traffic servers.
+- fix old clients sending messages to new servers (#1443)
+- remove empty journals when opening message queues and expiring idle queues (#1456, #1458).
+- additional start options (#1465):
+  - `maintenance` to run all start/stop operations without starting server.
+  - `skip-warnings` to ignore the last corrupted line in store log (can happen on abnormal termination).
+
+Ntf server:
+- record date of last token activity, to allow expiring inactive tokens.
+- additional token invalidation reasons in logs.
+
+SMP agent:
+- store message sent to multiple connections only once, to reduce storage when sending to groups (#1453).
+- encrypt messages on delivery, to reduce database writes (#1446).
+- don't block method calls on congested sockets for better concurrency (#1454).
+- check notification token status on client connection.
+- option to skip SQLite vacuum on migrations.
+
+# 6.3.0
+
+SMP agent: fix joining connection after failure by using the same ratchet.
+
+# 6.2.2
+
+SMP server:
+- add optional Prometheus metrics (#1411).
+
+Build:
+- remove three modules from client library.
+
+# 6.2.0
+
+Version 6.2.0.7
+
+Build:
+- client_library flag to build only used modules in the clients, remove package yaml
+
+SMP server:
+- journal storage for messages (BETA).
+- prevent race condition when deleting queue and to avoid "orphan" messages (#1395).
+
+SMP agent:
+- support SMP and XFTP server roles (storage/proxy) and operators (#1343).
+- treat blocked STM and other critical errors that offer restart as temporary for message delivery (#1405).
+- fix inconsistent state after app restart while accepting contact request (#1412).
+
+# 6.1.3
+
+SMP server: fix restoring notification credentials.
+
+# 6.1.2
+
+Servers: more reliable restoring of state.
+
+SMP server: reduced memory usage and faster start.
+
+Notifications: compensate for iOS notifications being dropped by Apple while device is offline (#1378):
+- Ntf server: send multiple SMP notifications in one iOS notification.
+- Agent: get multiple messages for one iOS notification.
+
+# 6.1.1
+
+SMP:
+- stop server faster (#1371)
+- add STORE error (#1372)
+
+# 6.1.0
+
+Version 6.1.0.7
+
+SMP server and client:
+- transport block encryption (#1317).
+
+Agent:
+- batch and optimize iOS notifications processing (#1308, #1311, #1313, #1316, #1330, #1331, #1333, #1337, #1346).
+- allow receiving multiple messages from single iOS notification (#1355, #1362).
+- prepare connection to accept to avoid race condition with events (#1365).
+- transport isolation mode "Session" (default) to use new SOCKS credentials when client restarts or SOCKS proxy configuration changes (#1321).
+
+Ntf server:
+- control port (#1354).
+- enable pings on ntf subscriptions, to resubscribe on reconnection (#1353).
+
+SMP server:
+- support multiple server ports (#1319).
+- support serving HTTPS and SMP transport on the same port (#1326, #1327).
+- persist iOS notifications to avoid losing them when Ntf server is offline (#1336, #1339, #1350).
+- fix lost notification subscriptions (#1347).
+- reject SKEY with different key earlier, at verification step (#1366).
+- pass server information via CLI during server initialization (#1356).
+- show version on server page (#1341).
+- explicit graceful shutdown on SIGINT (#1360).
+
+XRCP (remote access protocol):
+- use SHA3-256 in hybrid key agreement (#1302).
+- session encryption with forward secrecy (#1328).
+
+# 6.0.5
+
+SMP agent:
+- support generic SOCKS proxy (without isolate-by-auth).
+- reduce max message sizes
+
+# 6.0.4
+
+SMP server:
+- better performance/memory: fewer map updates on re-subscriptions (#1297), split and reduce STM transactions (#1294)
+- send DELD when subscribed queue is deleted (#1312)
+- add created/updated/used date to queues to manage expiration (#1306)
+
+XFTP server: truncate file creation time to 1 hour (#1310)
+
+Servers:
+- bind control port only to 127.0.0.1 for better security in case of firewall misconfiguration (#1280)
+- reduce memory used for period stats (#1298)
+
+Agent: process last notification from list (#1307)
+- report receive file error with redirected file ID, when redirect is present (#1304)
+- special error when deleted user record is not in database (#1303)
+- fix race when sending a message to the deleted connection (#1296)
+- support for multiple messages in a single notification
+
+Ntf server:
+- only use SOCKS proxy for servers without public address (#1314)
+
+# 6.0.3
+
+Agent:
+- fix possible stuck queue rotation (#1290).
+
+SMP server:
+- batch END responses when subscribed client switches to reduce server and client traffic.
+- reduce STM transactions for better performance.
+- add stats for END events and for SUB/DEL event batches.
+- remove "expensive" stats to save memory.
+
+# 6.0.2
+
+SMP agent:
+- fix stuck connection commands when a server is not responding.
+- store query errors, reduce slow query threshold to 1ms.
+
+Notification server:
+- reduce PING interval to 1 minute.
+- fix subscriptions disabled on race condition (only mark subscriptions with END status when received via the active connection).
+
+# 6.0.1
+
+SMP agent:
+- support changing user of the new connection.
+- do not start delivery workers when there are no messages to deliver.
+- enable notifications for all connections.
+- combine database transactions when subscribing.
+
+SMP server:
+- safe compacting of store log.
+- fix possible race when creating client that might lead to memory leak.
+
+Dependencies: upgrade tls to 1.9
+
+# 6.0.0
+
+Version 6.0.0.8
+
+Agent:
+- enabled fast handshake support.
+- batch-send multiple messages in each connection.
+- resume subscriptions as soon as agent moves to foreground or as network connection resumes.
+- "known" servers to determine whether to use SMP proxy.
+- retry on SMP proxy NO_SESSION error.
+- fixes to notification subscriptions.
+- persistent server statistics.
+- better concurrency.
+
+SMP server:
+- reduce threads usage.
+- additional statistics.
+- improve disabling inactive clients.
+- additional control port commands for monitoring.
+
+Notification server:
+- support onion-only SMP servers.
+
+# 5.8.2
+
+Agent:
+- fast handshake support (disabled).
+- new statistics api.
+
+SMP server:
+- fast handshake support (SKEY command).
+- minor changes to reduce memory usage.
+
+# 5.8.1
+
+Agent:
+- API to reconnect one server.
+- Better error handling of file errors and remote control connection errors.
+- Only start uploading file once all chunks were registered on the servers.
+
+SMP server:
+- additional stats for sent message notifications.
+- fix server page layout.
+
+# 5.8.0
+
+Version 5.8.0.10
+
+SMP server and client:
+- protocol extension to forward messages to the destination servers, to protect sending client IP address and transport session.
+
+Agent:
+- process timed out subscription responses to reduce the number of resubscriptions.
+- avoid sending messages and commands when waiting for response timed out (except batched SUB and DEL commands).
+- fix issue with stuck message reception on slow connection (when response to ACK timed out, and the new message was not processed until resubscribed).
+- fix issue when temporary file sending or receiving error was treated as permanent.
+
+SMP server:
+- include OK responses to all batched SUB requests to reduce subscription timeouts.
+
+XFTP server:
+- report file upload timeout as TIMEOUT, to avoid delivery failure.
+
+# 5.7.6
+
+XFTP agent:
+- treat XFTP handshake timeouts and network errors as temporary, to retry file operations.
+
+# 5.7.5
+
+SMP agent:
+- fail if non-unique connection IDs are passed to sendMessages (to prevent client errors and deadlocks).
+
+# 5.7.4
+
+SMP agent:
+- remove re-subscription timeouts (as they are tracked per operation, and could cause failed subscriptions).
+- reconnect XFTP clients when network settings changes.
+- fix lock contention resulting in stuck subscriptions on network change.
+
+# 5.7.3
+
+SMP/NTF protocol:
+- add ALPN for handshake version negotiation, similar to XFTP (to preserve backwards compatibility with the old clients).
+- upgrade clients to versions v7/v2 of the protocols.
+
+SMP server:
+- faster responses to subscription requests.
+
+XFTP client:
+- fix network exception during file download treated as permanent file error.
+
+SMP agent:
+- do not report subscription timeouts while client is offline.
+
+# 5.7.2
+
+SMP agent:
+- fix connections failing when connecting via link due to race condition on slow network.
+- remove concurrency limit when waiting for connection subscription.
+- remove TLS timeout.
+
+# 5.7.1
+
+SMP agent:
+- increase timeout for TLS connection via SOCKS
+
+# 5.7.0
+
+Version 5.7.0.4
+
+_Please note_: the earliest SimpleX Chat clients supported by this version of the servers is 5.5.3 (released on February 11, 2024).
+
+SMP server:
+- increase max SMP protocol version to 7 (support for deniable authenticators).
+
+NTF server:
+- increase max NTF protocol version to 2 (support for deniable authenticators).
+
+XFTP server:
+- version handshake using ALPN.
+
+SMP agent:
+- increase timeouts for XFTP files.
+- don't send commands after timeout.
+- PQ encryption support.
+
+# 5.6.2
+
+Version 5.6.2.2.
+
+SMP agent:
+- Lower memory consumption (~20-25%).
+- More stable XFTP file uploads and downloads.
+- API to receive network connectivity changes from the apps.
+- to reduce battery consumption: connection attempts interval growing to every 2 hours when app reports as offline.
+- to reduce retries and traffic: 50% increased timeouts when on mobile network.
+
+XFTP server:
+- expire files on start.
+- version negotiation based on TLS ALPN and handshake.
+
+NTF server:
+- reduced downtime by ~100x faster start time.
+- exclude test tokens from statistics.
+
+# 5.6.1
+
+Version 5.6.1.0.
+
+- Much faster iOS notification server start time (fewer skipped notifications).
+- Fix SMP server stored message stats.
+- Prevent overwriting uploaded XFTP files with subsequent upload attempts.
+- Faster base64 encoding/parsing.
+- Control port audit log and authentication.
+
+# 5.6.0
+
+Version 5.6.0.4.
+
+SMP protocol/client/server:
+- support deniable sender command authorization (to be enabled in the next version).
+- remove support for SMP protocol versions (prior to v4, 07/2022).
+
+Agent:
+- optional post-quantum key agreement using sntrup761 in double ratchet protocol.
+- improve performance of deleting multiple connections and files by batching database operations.
+- delay connection deletion to deliver pending messages.
+- API to test for notifications server.
+- remove support for client protocols versions (prior to 10/2022).
+
+XFTP server:
+- restore storage quota in case of failed uploads.
+
+Performance and stability improvements.
+
+# 5.5.3
+
+Agent:
+- notification token API also returns active notifications server.
+- support file descriptions with redirection and file URIs.
+
+Servers:
+- CLI commands for online key and certificate rotation.
+- Configure config and log paths via environment variables.
+
+# 5.5.2
+
+Extensible handshake for clients and SMP/NTF servers (ignore extra data).
+
+# 5.5.1
+
+SMP servers:
+- do not keep stats file open
+- additional stats about currently stored messages
+
+Agent:
+- support multiple notification servers (only one can be used at a time).
+- expire messages after "quota exceeded" error after 7 days (instead of 21 days previously).
+- stabilize message delivery, remove unnecessary subscription retries and traffic.
+- improve database performance for message delivery.
+- fix sockets/memory leak - a very old bug "activated" by improvements in v5.5.0.
+
+# 5.5.0
+
+Code:
+- compatible with GHC 8.10.7 to support compilation for armv7a.
+- migrate to `crypton` from deprecated `cryptonite` (the seed for DRG is now sha512-hashed).
+- use ChaChaDRG for all random IDs, keys and nonces, only using hashed entropy as seed.
+- more efficient transaction batching in SMP protocol client and server.
+
+Agent:
+- stabilize message reception and delivery, migrate message delivery to database queue.
+- additional event MSGNTF confirming that message received via notification is processed.
+- efficient processing of messages sent to multiple recipients with batched database transactions.
+- new worker abstraction for all queued tasks resilient to race conditions and some database errors.
+- many fixed race conditions.
+- background mode for iOS NSE.
+- additional error reporting to client on critical errors (to be show as alert in the clients).
+- functional api to get worker statistics.
+
+SMP/XFTP servers:
+- fix socket and memory leak on servers with high load (inactive clients without subscriptions are disconnected after set time of inactivity).
+- control port improvements.
+- fix statistics for stored queues, messages and files.
+- make writing to store log atomic (fixes a rare bug in XFTP server).
+
+# 5.4.0
+
+Migrate to GHC 9.6.3
+
+Agent:
+- database improvements:
+  - track slow queries.
+  - better performance.
+  - "busy" error handling.
+  - create parent folder when needed.
+  - support closing and re-opening database.
+- SMP agent improvements
+  - streaming for batched SMP commands.
+  - fix asynchronous JOINing connection.
+  - handle repeating JOINs without failure.
+  - api to get subscribed connections.
+  - return simplex:/ links as invitations.
+  - fix memory leak.
+- XFTP improvements:
+  - suspend when agent is suspended.
+  - support locally encrypted files.
+  - fixes - create empty file, prevent permanent error treated as temporary.
+  - upgrade HTTP2 library (fixes error handling and flow control).
+- Remote control protocol (XRCP)
+
+SMP server:
+- control port commands for GHC threads introspection.
+- allow creating new queues without subscriptions (required for iOS).
+
+XFTP server:
+- allow 64kb file chunks.
+
+NTF server:
+- faster startup.
+
+# 5.3.0
+
+Agent:
+- improve performance, track slow database queries.
+- support delivery receipts.
+
+SMP server:
+- control port
+
+# 5.2.0 (NTF server 1.5.0)
+
+Agent:
+- treat agent INACTIVE error as temporary - fixes failed message delivery in some race conditions.
+- restore connection confirmations after client restart - fixes failed connections.
+- ratchet resynchronization protocol and API.
+- increase connection version to mutually supported by both peers on each received message.
+
+Client:
+- make timeout for batched functions dependent on the number of batches - fixes expiry on large batches.
+
+Servers:
+- add timeout in case of sending TCP traffic and in case of partial delivery of requested blocks to avoid resource leaks.
+
+# 5.1.2, 5.1.3 (NTF server 1.4.1, 1.4.2)
+
+Agent:
+- ACK message on decryption error (fixes stuck message delivery bug)
+- more robust connection switching logic, API to abort switching the address
+
+Notification server:
+- batch subscriptions to SMP servers
+
+# 5.1.1 (NTF server 1.4.0)
+
+Agent:
+- store and check hashes of previous encrypted messages to differentiate between duplicates and decryption errors
+
+Server:
+- larger processing queues
+- expire messages when restoring them
+
+# 5.1.0
+
+XFTP client:
+- check encrypted file exists when uploading
+- remove user ID from deletion API
+
+Agent:
+- vacuum database on migrations
+
+SMP server:
+- configure message expiration time in INI file
+
+# 5.0.0
+
+SimpleX File Transfer Protocol (XFTP):
+- XFTP server
+- XFTP CLI
+- support XFTP in the agent
+
+Other changes:
+- preserve retry interval for sending messages on agent restarts
+- support IPv6 in the servers and in the agent
+- support for 32-bit platforms
+
+Read more about XFTP in this post: https://simplex.chat/blog/20230301-simplex-file-transfer-protocol.html
+
+# 4.4.1
+
+SMP agent:
+
+- fix handling of server addresses.
+- prevent message delivery getting stuck on IO error in SMP client.
+
+# 4.4.0
+
+SMP agent:
+
+- support multiple user profiles with transport session isolation.
+- support optional transport isolation per connection.
+- batch connection deletion
+- improve asynchronous connection deletion – it may now be completed after the client is restarted as well.
+- improve subscription logic to retry if initial attempt fails.
+- end SMP client connection after a number of failed PINGs (default is 3).
+
+# 4.3.0
+
+SMP server:
+
+- additional server usage statistics.
+
+SMP agent:
+
+- increase retry interval when sending messages after ERR QUOTA.
+
+# 4.2.0
+
+SMP agent and server:
+
+- reduce sender traffic in cases when queue quota is exceeded:
+  - server sends quota exceeded message to the recipient when sender receives ERR QUOTA.
+  - recipient sends QCONT message to the send once the queue is drained (via reply queue).
+  - sender retry delays are increased, reducing traffic, but sender instantly resumes delivery where QCONT is received.
+
+SMP server:
+
+- increase internal queue sizes.
+
+SMP agent:
+
+- deduplicate connection IDs in connect/disconnect responses.
+- unit tests for Crypto.hs.
+- fix connection switch to another queue: correctly set primary send queue.
+
+Notification server (v1.3.0):
+
+- check token status when sending verification notification.
+
+# 4.1.0
+
+SMP agent and server:
+
+- option to toggle TLS handshake error logs (disabled by default).
+
+SMP agent:
+
+- include server address in BROKER error.
+- api to get hash of double ratchet associated data (for connection verification).
+- api to get agent statistics.
+
+# 4.0.0
+
+SMP server:
+
+- Basic authentication. The server address can now include an optional password that is required to create messaging queues, so the contacts who message you will not be able to receive messages via your server, unless you share with them the address with the password. It is recommended to enable basic authentication on all private servers by adding `create_password` parameter into AUTH section of server INI file (the previously deployed servers do not have this section, you need to add it).
+- Disable creating new queues completely with `new_queues: off` parameter in AUTH section of INI file - it can be used to simplify migrating the existing connections to another server.
+- Updated server CLI with changed defaults:
+  - interactive server initialization, use -y flag to initialize the server non-interactively.
+  - store log is now enabled by default, so messaging queues and messages are restored when the server is restarted (to restore undelivered messages the server needs to be stopped with SIGINT signal).
+  - a random password is now generated by default during the server initialization.
+
+SMP agent:
+
+- API to test SMP servers. It connects to the server, creates and deletes a messaging queue. The new SimpleX Chat client uses this API to allow you to test that you have the correct server address, with the valid certificate fingerprint and password, before enabling the new server.
+
+# 3.4.0
+
+SMP agent:
+
+- increase concurrency with connection-level locks
+- fix issues identified in security assessment (see the announcement: https://github.com/simplex-chat/simplex-chat/blob/stable/blog/20221108-simplex-chat-v4.2-security-audit-new-website.md)
+- manual connection queue rotation
+- optional client data in connection requests links
+
+SMP server:
+
+- specialize monad stack to improve performance
+- log slow commands
+
+# 3.3.0
+
+SMP server:
+
+- allow repeated KEY command with the same key (to avoid failures on retries)
+
+SMP agent:
+
+- enable/disable connection notifications
+- asynchronous commands that retry on network error
+- use SQLCipher
+
+# 3.2.0
+
+SMP agent:
+
+- Support multiple server hostnames (including onion hostnames) in server addresses.
+- Network configuration options.
+- Options to define rules to choose server hostname.
+
 # 3.1.0
 
 SMP server and agent:
@@ -8,9 +723,9 @@ SMP server and agent:
 
 SMP server:
 
-- restore undeliverd messages when the server is restarted.
+- restore undelivered messages when the server is restarted.
 - SMP protocol v3 to support push notification:
-  - updated SEND and MSG to add message flags (for notification flag that contros whether the notification is sent and for any future extensions) and to move message meta-data sent to the recipient into the encrypted envelope.
+  - updated SEND and MSG to add message flags (for notification flag that confirm whether the notification is sent and for any future extensions) and to move message meta-data sent to the recipient into the encrypted envelope.
   - update NKEY and NID to add e2e encryption keys (for the notification meta-data encryption between SMP server and the client), and update NMSG to include this meta-data.
   - update ACK command to include message ID (to avoid acknowledging unprocessed message).
   - add NDEL commands to remove notification subscription credentials from SMP queue.
@@ -21,7 +736,7 @@ SMP agent:
 - new protocol for duplex connection handshake reducing traffic and connection time.
 - support for SMP notifications server and managing device token.
 - remove redundant FQDN validation from TLS handshake to prepare for access via Tor.
-- support for fully stopping agent and for termporary suspending agent operations.
+- support for fully stopping agent and for temporary suspending agent operations.
 - improve management of duplicate message delivery.
 
 SMP notifications server v1.0:

Dockerfile

@@ -0,0 +1,85 @@
+# syntax=docker/dockerfile:1.7.0-labs
+ARG TAG=24.04
+
+FROM ubuntu:${TAG} AS build
+
+### Build stage
+
+# Install curl and git and simplexmq dependencies
+RUN apt-get update && apt-get install -y curl git build-essential libgmp3-dev zlib1g-dev llvm-18 llvm-18-dev libnuma-dev libssl-dev
+
+# Specify bootstrap Haskell versions
+ENV BOOTSTRAP_HASKELL_GHC_VERSION=9.6.3
+ENV BOOTSTRAP_HASKELL_CABAL_VERSION=3.12.1.0
+
+# Do not install Stack
+ENV BOOTSTRAP_HASKELL_INSTALL_NO_STACK=true
+ENV BOOTSTRAP_HASKELL_INSTALL_NO_STACK_HOOK=true
+
+# Install ghcup
+RUN curl --proto '=https' --tlsv1.2 -sSf https://get-ghcup.haskell.org | BOOTSTRAP_HASKELL_NONINTERACTIVE=1 sh
+
+# Adjust PATH
+ENV PATH="/root/.cabal/bin:/root/.ghcup/bin:$PATH"
+
+# Set both as default
+RUN ghcup set ghc "${BOOTSTRAP_HASKELL_GHC_VERSION}" && \
+    ghcup set cabal "${BOOTSTRAP_HASKELL_CABAL_VERSION}"
+
+# Copy only the source code
+COPY apps /project/apps/
+COPY cbits /project/cbits/
+COPY src /project/src/
+
+COPY cabal.project Setup.hs simplexmq.cabal LICENSE /project
+
+WORKDIR /project
+
+# Debug
+#ARG CACHEBUST=1
+
+#ADD --chmod=755 https://github.com/MShekow/directory-checksum/releases/download/v1.4.6/directory-checksum_1.4.6_linux_amd64 /usr/local/bin/directory-checksum
+#RUN directory-checksum --max-depth 2 .
+
+# Set build arguments and check if they exist
+ARG APP
+RUN if [ -z "$APP" ]; then printf "Please spcify \$APP build-arg.\n"; exit 1; fi
+
+# Compile app
+RUN cabal update
+RUN cabal build exe:$APP
+
+# Copy scripts
+COPY scripts /project/scripts/
+
+# Create new path containing all files needed
+RUN mkdir /final
+WORKDIR /final
+
+# Strip the binary from debug symbols to reduce size
+RUN bin="$(find /project/dist-newstyle -name "$APP" -type f -executable)" && \
+    mv "$bin" ./ && \
+    strip ./"$APP" &&\
+    mv /project/scripts/docker/entrypoint-"$APP" ./entrypoint &&\
+    mv /project/scripts/main/simplex-servers-stopscript ./simplex-servers-stopscript
+
+### Final stage
+FROM ubuntu:${TAG}
+
+# Install OpenSSL dependency
+RUN apt-get update && apt-get install -y openssl libnuma-dev
+
+# Copy compiled app from build stage
+COPY --from=build /final /usr/local/bin/
+
+# Open app listening port
+ARG APP_PORT
+RUN if [ -z "$APP_PORT" ]; then printf "Please spcify \$APP_PORT build-arg.\n"; exit 1; fi
+
+EXPOSE $APP_PORT
+
+# simplexmq requires using SIGINT to correctly preserve undelivered messages and restore them on restart
+STOPSIGNAL SIGINT
+
+# Finally, execute helper script
+ENTRYPOINT [ "/usr/local/bin/entrypoint" ]

Dockerfile.build

@@ -0,0 +1,31 @@
+# syntax=docker/dockerfile:1.7.0-labs
+ARG TAG=24.04
+FROM ubuntu:${TAG} AS build
+
+### Build stage
+
+ARG GHC=9.6.3
+ARG CABAL=3.14.1.1
+
+# Install curl, git and and simplexmq dependencies
+RUN apt-get update && apt-get install -y curl libpq-dev git sqlite3 libsqlite3-dev build-essential libgmp3-dev zlib1g-dev llvm llvm-dev libnuma-dev libssl-dev
+
+# Specify bootstrap Haskell versions
+ENV BOOTSTRAP_HASKELL_GHC_VERSION=${GHC}
+ENV BOOTSTRAP_HASKELL_CABAL_VERSION=${CABAL}
+
+# Do not install Stack
+ENV BOOTSTRAP_HASKELL_INSTALL_NO_STACK=true
+ENV BOOTSTRAP_HASKELL_INSTALL_NO_STACK_HOOK=true
+
+# Install ghcup
+RUN curl --proto '=https' --tlsv1.2 -sSf https://get-ghcup.haskell.org | BOOTSTRAP_HASKELL_NONINTERACTIVE=1 sh
+
+# Adjust PATH
+ENV PATH="/root/.cabal/bin:/root/.ghcup/bin:$PATH"
+
+# Set both as default
+RUN ghcup set ghc "${GHC}" && \
+    ghcup set cabal "${CABAL}"
+
+WORKDIR /project

README.md

@@ -1,6 +1,6 @@
 # SimpleXMQ
 
-[![GitHub build](https://github.com/simplex-chat/simplexmq/workflows/build/badge.svg)](https://github.com/simplex-chat/simplexmq/actions?query=workflow%3Abuild)
+[![GitHub build](https://github.com/simplex-chat/simplexmq/actions/workflows/build.yml/badge.svg)](https://github.com/simplex-chat/simplexmq/actions/workflows/build.yml)
 [![GitHub release](https://img.shields.io/github/v/release/simplex-chat/simplexmq)](https://github.com/simplex-chat/simplexmq/releases)
 
 📢 SimpleXMQ v1 is released - with many security, privacy and efficiency improvements, new functionality - see [release notes](https://github.com/simplex-chat/simplexmq/releases/tag/v1.0.0).
@@ -11,7 +11,7 @@ If you have a server deployed please deploy a new server to a new host and retir
 
 ## Message broker for unidirectional (simplex) queues
 
-SimpleXMQ is a message broker for managing message queues and sending messages over public network. It consists of SMP server, SMP client library and SMP agent that implement [SMP protocol](https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md) for client-server communication and [SMP agent protocol](https://github.com/simplex-chat/simplexmq/blob/master/protocol/agent-protocol.md) to manage duplex connections via simplex queues on multiple SMP servers.
+SimpleXMQ is a message broker for managing message queues and sending messages over public network. It consists of SMP server, SMP client library and SMP agent that implement [SMP protocol](./protocol/simplex-messaging.md) for client-server communication and [SMP agent protocol](./protocol/agent-protocol.md) to manage duplex connections via simplex queues on multiple SMP servers.
 
 SMP protocol is inspired by [Redis serialization protocol](https://redis.io/topics/protocol), but it is much simpler - it currently has only 10 client commands and 8 server responses.
 
@@ -27,19 +27,19 @@ SimpleXMQ is implemented in Haskell - it benefits from robust software transacti
 
 ### SMP server
 
-[SMP server](https://github.com/simplex-chat/simplexmq/blob/master/apps/smp-server/Main.hs) can be run on any Linux distribution, including low power/low memory devices. OpenSSL library is required for initialization.
+[SMP server](./apps/smp-server/Main.hs) can be run on any Linux distribution, including low power/low memory devices. OpenSSL library is required for initialization.
 
 To initialize the server use `smp-server init -n <fqdn>` (or `smp-server init --ip <ip>` for IP based address) command - it will generate keys and certificates for TLS transport. The fingerprint of offline certificate is used as part of the server address to protect client/server connection against man-in-the-middle attacks: `smp://<fingerprint>@<hostname>[:5223]`.
 
 SMP server uses in-memory persistence with an optional append-only log of created queues that allows to re-start the server without losing the connections. This log is compacted on every server restart, permanently removing suspended and removed queues.
 
-To enable store log, initialize server using `smp-server -l` command, or modify `smp-server.ini` created during initialization (uncomment `enable: on` option in the store log section). Use `smp-server --help` for other usage tips.
+To enable store log, initialize server using `smp-server -l` command, or modify `smp-server.ini` created during initialization (uncomment `enable = on` option in the store log section). Use `smp-server --help` for other usage tips.
 
 Starting from version 2.3.0, when store log is enabled, the server would also enable saving undelivered messages on exit and restoring them on start. This can be disabled via a separate setting `restore_messages` in `smp-server.ini` file. Saving messages would only work if the server is stopped with SIGINT signal (keyboard interrupt), if it is stopped with SIGTERM signal the messages would not be saved.
 
 > **Please note:** On initialization SMP server creates a chain of two certificates: a self-signed CA certificate ("offline") and a server certificate used for TLS handshake ("online"). **You should store CA certificate private key securely and delete it from the server. If server TLS credential is compromised this key can be used to sign a new one, keeping the same server identity and established connections.** CA private key location by default is `/etc/opt/simplex/ca.key`.
 
-SMP server implements [SMP protocol](https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md).
+SMP server implements [SMP protocol](./protocol/simplex-messaging.md).
 
 #### Running SMP server on MacOS
 
@@ -62,7 +62,7 @@ Now `openssl version` should be saying "OpenSSL". You can now run `smp-server in
 
 ### SMP client library
 
-[SMP client](https://github.com/simplex-chat/simplexmq/blob/master/src/Simplex/Messaging/Client.hs) is a Haskell library to connect to SMP servers that allows to:
+[SMP client](./src/Simplex/Messaging/Client.hs) is a Haskell library to connect to SMP servers that allows to:
 
 - execute commands with a functional API.
 - receive messages and other notifications via STM queue.
@@ -70,13 +70,13 @@ Now `openssl version` should be saying "OpenSSL". You can now run `smp-server in
 
 ### SMP agent
 
-[SMP agent library](https://github.com/simplex-chat/simplexmq/blob/master/src/Simplex/Messaging/Agent.hs) can be used to run SMP agent as part of another application and to communicate with the agent via STM queues, without serializing and parsing commands and responses.
+[SMP agent library](./src/Simplex/Messaging/Agent.hs) can be used to run SMP agent as part of another application and to communicate with the agent via STM queues, without serializing and parsing commands and responses.
 
-Haskell type [ACommand](https://github.com/simplex-chat/simplexmq/blob/master/src/Simplex/Messaging/Agent/Protocol.hs) represents SMP agent protocol to communicate via STM queues.
+Haskell type [ACommand](./src/Simplex/Messaging/Agent/Protocol.hs) represents SMP agent protocol to communicate via STM queues.
 
 See [simplex-chat](https://github.com/simplex-chat/simplex-chat) terminal UI for the example of integrating SMP agent into another application.
 
-[SMP agent executable](https://github.com/simplex-chat/simplexmq/blob/master/apps/smp-agent/Main.hs) can be used to run a standalone SMP agent process that implements plaintext [SMP agent protocol](https://github.com/simplex-chat/simplexmq/blob/master/protocol/agent-protocol.md) via TCP port 5224, so it can be used via telnet. It can be deployed in private networks to share access to the connections between multiple applications and services.
+[SMP agent executable](./apps/smp-agent/Main.hs) can be used to run a standalone SMP agent process that implements plaintext [SMP agent protocol](./protocol/agent-protocol.md) via TCP port 5224, so it can be used via telnet. It can be deployed in private networks to share access to the connections between multiple applications and services.
 
 ## Using SMP server and SMP agent
 
@@ -90,27 +90,175 @@ You can either run your own SMP server locally or deploy using [Linode StackScri
 
 It's the easiest to try SMP agent via a prototype [simplex-chat](https://github.com/simplex-chat/simplex-chat) terminal UI.
 
-## Deploy SMP server on Linux
+## Deploy SMP/XFTP servers on Linux
 
-You can run your SMP server as a Linux process, optionally using a service manager for booting and restarts.
+You can run your SMP/XFTP server as a Linux process, optionally using a service manager for booting and restarts.
 
-- For Ubuntu you can download a binary from [the latest release](https://github.com/simplex-chat/simplexmq/releases).
+Notice that `smp-server` and `xftp-server` requires `openssl` as run-time dependency (it is used to generate server certificates during initialization). Install it with your packet manager:
 
-  If you're using other Linux distribution and the binary is incompatible with it, you can build from source using [Haskell stack](https://docs.haskellstack.org/en/stable/README/):
+```sh
+# For Ubuntu
+apt update && apt install openssl
+```
 
-  ```shell
-  curl -sSL https://get.haskellstack.org/ | sh
-  ...
-  stack install
-  ```
+### Install binaries
+
+#### Using Docker
+
+On Linux, you can deploy smp and xftp server using Docker. This will download image from [Docker Hub](https://hub.docker.com/r/simplexchat).
+
+1. Create directories for persistent Docker configuration:
+
+   ```sh
+   mkdir -p $HOME/simplex/{xftp,smp}/{config,logs} && mkdir -p $HOME/simplex/xftp/files
+   ```
+
+2. Run your Docker container.
+
+   - `smp-server`
+
+     You must change **your_ip_or_domain**. `-e "pass=password"` is optional variable to password-protect your `smp` server:
+     ```sh
+     docker run -d \
+         -e "ADDR=your_ip_or_domain" \
+         -e "PASS=password" \
+         -p 5223:5223 \
+         -v $HOME/simplex/smp/config:/etc/opt/simplex:z \
+         -v $HOME/simplex/smp/logs:/var/opt/simplex:z \
+         simplexchat/smp-server:latest
+     ```
+
+   - `xftp-server`
+
+     You must change **your_ip_or_domain** and **maximum_storage**.
+     ```sh
+     docker run -d \
+         -e "ADDR=your_ip_or_domain" \
+         -e "QUOTA=maximum_storage" \
+         -p 443:443 \
+         -v $HOME/simplex/xftp/config:/etc/opt/simplex-xftp:z \
+         -v $HOME/simplex/xftp/logs:/var/opt/simplex-xftp:z \
+         -v $HOME/simplex/xftp/files:/srv/xftp:z \
+         simplexchat/xftp-server:latest
+     ```
+
+#### Using installation script
+
+**Please note** that currently, only Ubuntu distribution is supported.
+
+You can install and setup servers automatically using our script:
+
+```sh
+curl --proto '=https' --tlsv1.2 -sSf https://raw.githubusercontent.com/simplex-chat/simplexmq/stable/install.sh -o simplex-server-install.sh &&\
+if echo '53fcdb4ceab324316e2c4cda7e84dbbb344f32550a65975a7895425e5a1be757 simplex-server-install.sh' | sha256sum -c; then
+  chmod +x ./simplex-server-install.sh
+  ./simplex-server-install.sh
+  rm ./simplex-server-install.sh
+else
+  echo "SHA-256 checksum is incorrect!"
+  rm ./simplex-server-install.sh
+fi
+```
+
+### Build from source
+
+#### Using Docker
+
+> **Please note:** to build the app use source code from [stable branch](https://github.com/simplex-chat/simplexmq/tree/stable).
+
+On Linux, you can build smp server using Docker.
+
+1. Build your images:
+
+   ```sh
+   git clone https://github.com/simplex-chat/simplexmq
+   cd simplexmq
+   git checkout stable
+   DOCKER_BUILDKIT=1 docker build -t local/smp-server --build-arg APP="smp-server" --build-arg APP_PORT="5223" . # For xmp-server
+   DOCKER_BUILDKIT=1 docker build -t local/xftp-server --build-arg APP="xftp-server" --build-arg APP_PORT="443" . # For xftp-server
+   ```
+
+2. Create directories for persistent Docker configuration:
+
+   ```sh
+   mkdir -p $HOME/simplex/{xftp,smp}/{config,logs} && mkdir -p $HOME/simplex/xftp/files
+   ```
+
+3. Run your Docker container.
+
+   - `smp-server`
+
+     You must change **your_ip_or_domain**. `-e "pass=password"` is optional variable to password-protect your `smp` server:
+     ```sh
+     docker run -d \
+         -e "ADDR=your_ip_or_domain" \
+         -e "PASS=password" \
+         -p 5223:5223 \
+         -v $HOME/simplex/smp/config:/etc/opt/simplex:z \
+         -v $HOME/simplex/smp/logs:/var/opt/simplex:z \
+         simplexchat/smp-server:latest
+     ```
+
+   - `xftp-server`
+
+     You must change **your_ip_or_domain** and **maximum_storage**.
+     ```sh
+     docker run -d \
+         -e "ADDR=your_ip_or_domain" \
+         -e "QUOTA=maximum_storage" \
+         -p 443:443 \
+         -v $HOME/simplex/xftp/config:/etc/opt/simplex-xftp:z \
+         -v $HOME/simplex/xftp/logs:/var/opt/simplex-xftp:z \
+         -v $HOME/simplex/xftp/files:/srv/xftp:z \
+         simplexchat/xftp-server:latest
+     ```
+
+#### Using your distribution
+
+1. Install dependencies and build tools (`GHC`, `cabal` and dev libs):
+
+   ```sh
+   # On Ubuntu. Depending on your distribution, use your package manager to determine package names.
+   sudo apt-get update && apt-get install -y build-essential curl libffi-dev libffi7 libgmp3-dev libgmp10 libncurses-dev libncurses5 libtinfo5 pkg-config zlib1g-dev libnuma-dev libssl-dev
+   export BOOTSTRAP_HASKELL_GHC_VERSION=9.6.3
+   export BOOTSTRAP_HASKELL_CABAL_VERSION=3.10.3.0
+   curl --proto '=https' --tlsv1.2 -sSf https://get-ghcup.haskell.org | BOOTSTRAP_HASKELL_NONINTERACTIVE=1 sh
+   ghcup set ghc "${BOOTSTRAP_HASKELL_GHC_VERSION}"
+   ghcup set cabal "${BOOTSTRAP_HASKELL_CABAL_VERSION}"
+   source ~/.ghcup/env
+   ```
+
+2. Build the project:
+
+   ```sh
+   git clone https://github.com/simplex-chat/simplexmq
+   cd simplexmq
+   git checkout stable
+   cabal update
+   cabal build exe:smp-server exe:xftp-server
+   ```
+
+3. List compiled binaries:
+
+   `smp-server`
+   ```sh
+   cabal list-bin exe:smp-server
+   ```
+
+   `xftp-server`
+   ```sh
+   cabal list-bin exe:xftp-server
+   ```
 
 - Initialize SMP server with `smp-server init [-l] -n <fqdn>` or `smp-server init [-l] --ip <ip>` - depending on how you initialize it, either FQDN or IP will be used for server's address.
 
 - Run `smp-server start` to start SMP server, or you can configure a service manager to run it as a service.
 
+- Optionally, `smp-server` can be setup for having an onion address in `tor` network. See: [`scripts/tor`](./scripts/tor/). In this case, the server address can have both public and onion hostname pointing to the same server, to allow two people connect when only one of them is using Tor. The server address would be: `smp://<fingerprint>@<public_hostname>,<onion_hostname>`
+
 See [this section](#smp-server) for more information. Run `smp-server -h` and `smp-server init -h` for explanation of commands and options.
 
-[<img alt="Linode" src="https://raw.githubusercontent.com/simplex-chat/simplexmq/master/img/linode.svg" align="right" width="200">](https://cloud.linode.com/stackscripts/748014)
+[<img alt="Linode" src="./img/linode.svg" align="right" width="200">](https://cloud.linode.com/stackscripts/748014)
 
 ## Deploy SMP server on Linode
 
@@ -134,7 +282,7 @@ Deployment on Linode is performed via StackScripts, which serve as recipes for L
 
 Please submit an [issue](https://github.com/simplex-chat/simplexmq/issues) if any problems occur.
 
-[<img alt="DigitalOcean" src="https://raw.githubusercontent.com/simplex-chat/simplexmq/master/img/digitalocean.png" align="right" width="300">](https://marketplace.digitalocean.com/apps/simplex-server)
+[<img alt="DigitalOcean" src="/img/digitalocean.png" align="right" width="300">](https://marketplace.digitalocean.com/apps/simplex-server)
 
 ## Deploy SMP server on DigitalOcean
 
@@ -162,12 +310,12 @@ smp-server init [-l] -n <fqdn>
 
 ## SMP server design
 
-![SMP server design](https://raw.githubusercontent.com/simplex-chat/simplexmq/master/design/server.svg)
+![SMP server design](./design/server.svg)
 
 ## SMP agent design
 
-![SMP agent design](https://raw.githubusercontent.com/simplex-chat/simplexmq/master/design/agent2.svg)
+![SMP agent design](./design/agent2.svg)
 
 ## License
 
-[AGPL v3](https://github.com/simplex-chat/simplexmq/blob/master/LICENSE)
+[AGPL v3](./LICENSE)

apps/common/Web/Embedded.hs

@@ -0,0 +1,15 @@
+{-# LANGUAGE TemplateHaskell #-}
+
+module Web.Embedded where
+
+import Data.FileEmbed (embedDir, embedFile)
+import Simplex.Messaging.Server.Web (EmbeddedContent (..))
+
+embeddedContent :: EmbeddedContent
+embeddedContent =
+  EmbeddedContent
+    { indexHtml = $(embedFile "apps/common/Web/static/index.html"),
+      linkHtml = $(embedFile "apps/common/Web/static/link.html"),
+      mediaContent = $(embedDir "apps/common/Web/static/media/"),
+      wellKnown = $(embedDir "apps/common/Web/static/.well-known/")
+    }

apps/common/Web/static/.well-known/apple-app-site-association

@@ -0,0 +1,49 @@
+{
+  "applinks": {
+    "details": [
+      {
+        "appIDs": [
+          "5NN7GUYB6T.chat.simplex.app"
+        ],
+        "components": [
+          {
+            "/": "/contact/*"
+          },
+          {
+            "/": "/contact"
+          },
+          {
+            "/": "/invitation/*"
+          },
+          {
+            "/": "/invitation"
+          },
+          {
+            "/": "/a/*"
+          },
+          {
+            "/": "/a"
+          },
+          {
+            "/": "/c/*"
+          },
+          {
+            "/": "/c"
+          },
+          {
+            "/": "/g/*"
+          },
+          {
+            "/": "/g"
+          },
+          {
+            "/": "/i/*"
+          },
+          {
+            "/": "/i"
+          }
+        ]
+      }
+    ]
+  }
+}

apps/common/Web/static/.well-known/assetlinks.json

@@ -0,0 +1,16 @@
+[
+    {
+        "relation": [
+            "delegate_permission/common.handle_all_urls"
+        ],
+        "target": {
+            "namespace": "android_app",
+            "package_name": "chat.simplex.app",
+            "sha256_cert_fingerprints": [
+                "5E:3E:DC:C2:00:FB:A8:D5:F4:88:F3:CA:4C:32:5B:05:78:C5:6A:9C:03:A1:CC:B5:92:9C:D7:5C:7E:57:E2:4D",
+                "3C:52:C4:FD:3C:AD:1C:07:C9:B0:0A:70:80:E3:58:FA:B9:FE:FC:B8:AF:5A:EC:14:77:65:F1:6D:0F:21:AD:85",
+                "AE:C1:95:DC:FD:46:14:BD:3A:91:EC:26:D1:D5:14:C8:75:71:C5:CC:8D:CF:48:08:3F:92:83:14:3C:A2:B9:A6"
+            ]
+        }
+    }
+]

apps/common/Web/static/media/apple_store.svg

@@ -0,0 +1,26 @@
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+</svg>

apps/common/Web/static/media/contact.js

@@ -0,0 +1,77 @@
+(function () {
+
+  let complete = false
+  run()
+  window.onload = run
+
+  async function run() {
+    const connURIel = document.getElementById("conn_req_uri_text");
+    const mobileConnURIanchor = document.getElementById("mobile_conn_req_uri");
+    const connQRCodes = document.getElementsByClassName("conn_req_uri_qrcode");
+    console.log(connQRCodes);
+    if (complete || !connURIel || !mobileConnURIanchor || connQRCodes < 2) return
+    complete = true
+    let connURI = document.location.toString()
+    const parsedURI = new URL(connURI)
+    const path = parsedURI.pathname.split("/")
+    const len = path.length
+    const action = path[len - (path[len - 1] == "" ? 2 : 1)]
+    parsedURI.protocol = "https"
+    parsedURI.pathname = "/" + action
+    connURI = parsedURI.toString()
+    console.log("connection URI: ", connURI)
+    const hash = parsedURI.hash
+    const hostname = parsedURI.hostname
+    let appURI = "simplex:" + parsedURI.pathname
+    appURI += action.length > 1 // not short link
+              ? hash
+              : !hash.includes("?") // otherwise add server hostname
+              ? hash + "?h=" + hostname // no parameters
+              : !hash.includes("?h=") && !hash.includes("&h=")
+              ? hash + "&h=" + hostname // no "h" parameter
+              : hash.replace(/([?&])h=([^&]+)/, `$1h=${hostname},$2`) // add as the first hostname to "h" parameter
+    mobileConnURIanchor.href = appURI
+    console.log("app URI: ", appURI)
+    connURIel.innerText = "/c " + connURI
+    for (const connQRCode of connQRCodes) {
+      try {
+        await QRCode.toCanvas(connQRCode, connURI, {
+          errorCorrectionLevel: "M",
+          color: {dark: "#062D56"}
+        });
+        connQRCode.style.width = "320px";
+        connQRCode.style.height = "320px";
+      } catch (err) {
+        console.error(err);
+      }
+    }
+
+    function contentCopyWithTooltip(parent) {
+      const content = parent.querySelector(".content");
+      const tooltip = parent.querySelector(".tooltiptext");
+      console.log(parent.querySelector(".content_copy"), 111)
+      console.log(parent)
+      const copyButton = parent.querySelector(".content_copy");
+      copyButton.addEventListener("click", copyAddress)
+      copyButton.addEventListener("mouseout", resetTooltip)
+
+      function copyAddress() {
+        navigator.clipboard.writeText(content.innerText || content.value);
+        tooltip.innerHTML = "Copied!";
+      }
+
+      function resetTooltip() {
+        tooltip.innerHTML = "Copy to clipboard";
+      }
+    }
+
+    function copyAddress() {
+      navigator.clipboard.writeText(connURI);
+      tooltipEl.innerHTML = "Copied!";
+    }
+
+    function resetTooltip() {
+      tooltipEl.innerHTML = "Copy to clipboard";
+    }
+  }
+})();

apps/common/Web/static/media/f_droid.svg

@@ -0,0 +1,372 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   width="560"
+   height="164"
+   version="1.1"
+   id="svg1048"
+   sodipodi:docname="f_droid.svg"
+   inkscape:version="1.1.2 (0a00cf5339, 2022-02-04, custom)"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:xlink="http://www.w3.org/1999/xlink"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg">
+  <sodipodi:namedview
+     id="namedview1050"
+     pagecolor="#505050"
+     bordercolor="#ffffff"
+     borderopacity="1"
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+<path d="M27.1 16.3001L12.5 8.00005C11.6 7.50005 10.9 7.60005 10.4 8.10005L22.9 20.5001L27.1 16.3001V16.3001Z" fill="url(#paint3_linear_7_408)"/>
+<path opacity="0.2" d="M27 24.6L12.5 32.8C11.7 33.3 11 33.2 10.5 32.8L10.4 32.9L10.5 33C11 33.4 11.7 33.5 12.5 33L27 24.6Z" fill="black"/>
+<path opacity="0.12" d="M10.4 32.8C10.1 32.5 10 32 10 31.4V31.5C10 32.1 10.2 32.6 10.5 32.9V32.8H10.4ZM32 21.8L27 24.6L27.1 24.7L32 21.9C32.7 21.5 33 21 33 20.5C33 21 32.6 21.4 32 21.8V21.8Z" fill="black"/>
+<path opacity="0.25" d="M12.5 8.10003L32 19.2C32.6 19.6 33 20 33 20.5C33 20 32.7 19.5 32 19.1L12.5 8.00003C11.1 7.20003 10 7.80003 10 9.40003V9.50003C10 8.00003 11.1 7.30003 12.5 8.10003Z" fill="white"/>
+<defs>
+<linearGradient id="paint0_linear_7_408" x1="21.8" y1="9.21" x2="5.017" y2="25.992" gradientUnits="userSpaceOnUse">
+<stop stop-color="#00A0FF"/>
+<stop offset="0.007" stop-color="#00A1FF"/>
+<stop offset="0.26" stop-color="#00BEFF"/>
+<stop offset="0.512" stop-color="#00D2FF"/>
+<stop offset="0.76" stop-color="#00DFFF"/>
+<stop offset="1" stop-color="#00E3FF"/>
+</linearGradient>
+<linearGradient id="paint1_linear_7_408" x1="33.834" y1="20.501" x2="9.63699" y2="20.501" gradientUnits="userSpaceOnUse">
+<stop stop-color="#FFE000"/>
+<stop offset="0.409" stop-color="#FFBD00"/>
+<stop offset="0.775" stop-color="#FFA500"/>
+<stop offset="1" stop-color="#FF9C00"/>
+</linearGradient>
+<linearGradient id="paint2_linear_7_408" x1="24.827" y1="22.796" x2="2.069" y2="45.554" gradientUnits="userSpaceOnUse">
+<stop stop-color="#FF3A44"/>
+<stop offset="1" stop-color="#C31162"/>
+</linearGradient>
+<linearGradient id="paint3_linear_7_408" x1="7.29699" y1="0.676051" x2="17.46" y2="10.8391" gradientUnits="userSpaceOnUse">
+<stop stop-color="#32A071"/>
+<stop offset="0.069" stop-color="#2DA771"/>
+<stop offset="0.476" stop-color="#15CF74"/>
+<stop offset="0.801" stop-color="#06E775"/>
+<stop offset="1" stop-color="#00F076"/>
+</linearGradient>
+</defs>
+</svg>

apps/common/Web/static/media/logo-symbol-dark.svg

@@ -0,0 +1,10 @@
+<svg width="34" height="35" viewBox="0 0 34 35" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path fill-rule="evenodd" clip-rule="evenodd" d="M3.02958 8.60922L8.622 14.2013L14.3705 8.45375L17.1669 11.2498L11.4183 16.9972L17.0114 22.5895L14.1373 25.4633L8.54422 19.871L2.79636 25.6187L0 22.8227L5.74794 17.075L0.155484 11.483L3.02958 8.60922Z" fill="white"/>
+<path fill-rule="evenodd" clip-rule="evenodd" d="M14.0923 25.5156L16.944 22.6642L16.9429 22.6634L22.6467 16.9612L17.0513 11.3675L17.0523 11.367L14.2548 8.56979L8.65972 2.97535L11.5114 0.123963L17.1061 5.71849L22.8099 0.015625L25.6074 2.81285L19.9035 8.51562L25.4984 14.1099L31.2025 8.40729L34 11.2045L28.2958 16.907L33.8917 22.5017L31.0399 25.3531L25.4442 19.7584L19.7409 25.4611L25.3365 31.0559L22.4848 33.9073L16.8892 28.3124L11.1864 34.0156L8.38885 31.2184L14.0923 25.5156Z" fill="url(#paint0_linear_656_10815)"/>
+<defs>
+<linearGradient id="paint0_linear_656_10815" x1="12.8381" y1="-0.678252" x2="9.54355" y2="31.4493" gradientUnits="userSpaceOnUse">
+<stop stop-color="#01F1FF"/>
+<stop offset="1" stop-color="#0197FF"/>
+</linearGradient>
+</defs>
+</svg>

apps/common/Web/static/media/logo-symbol-light.svg

@@ -0,0 +1,15 @@
+<svg width="34" height="34" viewBox="0 0 34 34" fill="none" xmlns="http://www.w3.org/2000/svg">
+<g clip-path="url(#clip0_14_10)">
+<path fill-rule="evenodd" clip-rule="evenodd" d="M3.02972 8.59396L8.62219 14.186L14.3703 8.43848L17.1668 11.2346L11.4182 16.982L17.0112 22.5742L14.1371 25.448L8.5441 19.8557L2.79651 25.6035L0 22.8074L5.74813 17.0597L0.155656 11.4678L3.02972 8.59396Z" fill="#023789"/>
+<path fill-rule="evenodd" clip-rule="evenodd" d="M14.0922 25.5L16.9434 22.6486L16.9423 22.6478L22.6464 16.9456L17.0512 11.3519L17.0518 11.3514L14.2542 8.55418L8.65961 2.95973L11.5114 0.108337L17.106 5.70288L22.8095 0L25.607 2.79722L19.903 8.5L25.4981 14.0943L31.2022 8.39169L33.9997 11.1889L28.2957 16.8914L33.8914 22.4861L31.0396 25.3375L25.4439 19.7428L19.7404 25.4454L25.3361 31.0403L22.4843 33.8917L16.8887 28.2968L11.1862 34L8.38867 31.2028L14.0922 25.5Z" fill="url(#paint0_linear_14_10)"/>
+</g>
+<defs>
+<linearGradient id="paint0_linear_14_10" x1="12.8379" y1="-0.693875" x2="9.54344" y2="31.4337" gradientUnits="userSpaceOnUse">
+<stop stop-color="#01F1FF"/>
+<stop offset="1" stop-color="#0197FF"/>
+</linearGradient>
+<clipPath id="clip0_14_10">
+<rect width="34" height="34" fill="white"/>
+</clipPath>
+</defs>
+</svg>

apps/common/Web/static/media/moon.svg

@@ -0,0 +1,3 @@
+<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M2.92814 12.6789C6.17655 15.9347 11.7044 15.6463 14.5425 12.0117C14.6636 11.8566 14.6825 11.6448 14.5907 11.4708C14.4989 11.2967 14.3136 11.1926 14.1172 11.2049C11.5269 11.3673 8.97627 10.4315 7.0743 8.52765C5.17264 6.62414 4.23958 4.06868 4.40169 1.47281C4.41397 1.2762 4.30965 1.09069 4.13526 0.999048C3.96088 0.907402 3.74893 0.926696 3.59396 1.04833C3.36099 1.23117 3.13828 1.42685 2.92823 1.63726C-0.111372 4.68223 -0.111585 9.63533 2.92814 12.6789Z" stroke="black" stroke-miterlimit="10" stroke-linejoin="round"/>
+</svg>

apps/common/Web/static/media/script.js

@@ -0,0 +1,39 @@
+const isMobile = {
+    Android: () => navigator.userAgent.match(/Android/i),
+    iOS: () => navigator.userAgent.match(/iPhone|iPad|iPod/i)
+};
+
+window.addEventListener('click', clickHandler)
+
+if (isMobile.iOS) {
+    for (const btn of document.getElementsByClassName("close-overlay-btn")) {
+        btn.addEventListener("touchend", (e) => setTimeout(() => closeOverlay(e), 100))
+    }
+}
+
+function clickHandler(e) {
+    if (e.target.closest('.contact-tab-btn')) {
+        e.target.closest('.contact-tab').classList.toggle('active')
+    }
+}
+
+window.addEventListener('load', () => {
+    const googlePlayBtn = document.querySelector('.google-play-btn');
+    const appleStoreBtn = document.querySelector('.apple-store-btn');
+    const fDroidBtn = document.querySelector('.f-droid-btn');
+    if (!googlePlayBtn || !appleStoreBtn || !fDroidBtn) return;
+
+
+    if (isMobile.Android()) {
+        googlePlayBtn.classList.remove('hidden');
+        fDroidBtn.classList.remove('hidden');
+    }
+    else if (isMobile.iOS()) {
+        appleStoreBtn.classList.remove('hidden');
+    }
+    else {
+        appleStoreBtn.classList.remove('hidden');
+        googlePlayBtn.classList.remove('hidden');
+        fDroidBtn.classList.remove('hidden');
+    }
+})

apps/common/Web/static/media/style.css

@@ -0,0 +1,414 @@
+@font-face {
+  font-family: Gilroy;
+  src: url("GilroyRegular.woff2") format("woff2");
+  font-weight: 400;
+  font-style: normal;
+}
+
+@font-face {
+  font-family: Gilroy;
+  src: url("GilroyLight.woff2") format("woff2");
+  font-weight: 300;
+  font-style: normal;
+}
+
+@font-face {
+  font-family: Gilroy;
+  src: url("GilroyMedium.woff2") format("woff2");
+  font-weight: 500;
+  font-style: normal;
+}
+
+@font-face {
+  font-family: Gilroy;
+  src: url("GilroyBold.woff2") format("woff2");
+  font-weight: 700;
+  font-style: normal;
+}
+
+@font-face {
+  font-family: Gilroy;
+  src: url("GilroyRegularItalic.woff2") format("woff2");
+  font-weight: 400;
+  font-style: italic;
+}
+
+html {
+  scroll-behavior: smooth;
+  font-family: Gilroy, Helvetica, sans-serif;
+  ;
+  letter-spacing: 0.003em;
+}
+
+img {
+  user-select: none;
+  -webkit-user-select: none;
+  /* For Safari and older Chrome versions */
+  -moz-user-select: none;
+  /* For Firefox */
+  -ms-user-select: none;
+  /* For Internet Explorer and Edge */
+}
+
+a{
+  word-wrap: break-word;
+}
+
+/* NEW SITE */
+.container,
+.container-fluid,
+.container-xxl,
+.container-xl,
+.container-lg,
+.container-md,
+.container-sm {
+  width: 100%;
+  /* padding: 0 20px; */
+  margin-right: auto;
+  margin-left: auto;
+}
+
+@media (min-width: 576px) {
+
+  .container-sm,
+  .container {
+    max-width: 540px;
+  }
+}
+
+@media (min-width: 768px) {
+
+  .container-md,
+  .container-sm,
+  .container {
+    max-width: 720px;
+  }
+}
+
+@media (min-width: 992px) {
+
+  .container-lg,
+  .container-md,
+  .container-sm,
+  .container {
+    max-width: 960px;
+  }
+}
+
+@media (min-width: 1200px) {
+
+  .container-xl,
+  .container-lg,
+  .container-md,
+  .container-sm,
+  .container {
+    max-width: 1140px;
+  }
+}
+
+@media (min-width: 1400px) {
+
+  .container-xxl,
+  .container-xl,
+  .container-lg,
+  .container-md,
+  .container-sm,
+  .container {
+    max-width: 1320px;
+  }
+}
+
+.gradient-text {
+  background: -webkit-linear-gradient(to bottom, #53C1FF -50%, #0053D0 160%);
+  background: linear-gradient(to bottom, #53C1FF -50%, #0053D0 160%);
+  -webkit-background-clip: text;
+  -webkit-text-fill-color: transparent;
+  background-clip: text;
+  text-fill-color: transparent;
+}
+
+.dark .border-gradient {
+  background:
+    linear-gradient(#11182F, #11182F) padding-box,
+    linear-gradient(to bottom, transparent, #01F1FF 58%) border-box;
+  border: 1px solid transparent;
+}
+
+.dark .only-light {
+  display: none;
+}
+
+.only-dark {
+  display: none;
+}
+
+.dark .only-dark {
+  display: inherit;
+}
+
+.menu-link {
+  font-size: 16px;
+  line-height: 33.42px;
+  color: #0D0E12;
+}
+
+.dark .menu-link {
+  color: #fff;
+}
+
+.nav-link ul li a.active {
+  color: #0053D0;
+
+}
+
+.dark .nav-link ul li a.active {
+  color: #66D9E2;
+}
+
+@media (min-width:1024px) {
+
+  .nav-link-text,
+  .menu-link {
+    display: inline-block;
+    position: relative;
+    color: #0D0E12;
+  }
+
+  .nav-link-text::before,
+  .active .nav-link-text::before,
+  .menu-link::before {
+    content: "";
+    position: absolute;
+    width: 0;
+    height: 1px;
+    bottom: 0;
+    right: 0;
+    /* background-color: initial; */
+    transition: width 0.25s ease-out;
+  }
+
+  .menu-link::before {
+    background-color: #0D0E12;
+  }
+
+  .dark .menu-link::before {
+    background-color: #fff;
+  }
+
+  .active .nav-link-text::before {
+    width: 100%;
+  }
+
+  .nav-link:hover .nav-link-text::before,
+  .menu-link:hover::before {
+    width: 100%;
+    left: 0;
+    right: auto;
+  }
+}
+
+
+.sub-menu {
+  visibility: hidden;
+  opacity: 0;
+  color: #505158;
+}
+
+.sub-menu .no-hover {
+  color: #505158 !important;
+}
+
+.dark .sub-menu,
+.dark .sub-menu .no-hover {
+  color: #fff !important;
+}
+
+.dark .sub-menu li:hover {
+  color: #66D9E2;
+}
+
+.sub-menu li:hover {
+  color: #0053D0;
+}
+
+.sub-menu {
+  transition: all .3s ease !important;
+}
+
+.nav-link span svg,
+header nav {
+  transition: all 0.5s ease;
+}
+
+.nav-link:hover span svg {
+  transform: rotate(180deg);
+}
+
+@media (min-width:1024px) {
+
+  .nav-link:hover .sub-menu,
+  .nav-link:focus-within .sub-menu {
+    visibility: visible;
+    opacity: 1;
+    margin-top: 0;
+  }
+}
+
+@media (max-width: 1024px) {
+  .sub-menu {
+    max-height: 0;
+    transform: translateY(-10px);
+    transition: all .7s ease !important;
+  }
+
+  .active .sub-menu {
+    max-height: 600px;
+    transform: translateY(0px);
+    opacity: 1;
+    visibility: visible;
+    margin-top: 0;
+  }
+
+  header nav {
+    visibility: hidden;
+    opacity: 0;
+    transform: translateX(100%);
+  }
+
+  header nav.open {
+    visibility: visible;
+    opacity: 1;
+    transform: translateX(0);
+  }
+}
+
+.lock-scroll {
+  overflow: hidden;
+}
+
+/* hero */
+header {
+  transition: all .7s ease;
+}
+
+.primary-header {
+  background: linear-gradient(270deg, #0053D0 35.85%, #0197FF 94.78%);
+  -webkit-background-clip: text;
+  -webkit-text-fill-color: transparent;
+  background-clip: text;
+  text-shadow: 0px 4px 74px #e9e7e2;
+}
+
+.dark .primary-header {
+  background: linear-gradient(270deg, #70F0F9 100%, #70F0F9 100%);
+  -webkit-background-clip: text;
+  -webkit-text-fill-color: transparent;
+  background-clip: text;
+  text-shadow: none;
+}
+
+.secondary-header {
+  color: #606c71;
+  text-shadow: 0px 4px 74px #e9e7e2;
+}
+
+.dark .secondary-header {
+  color: #fff;
+  text-shadow: none;
+}
+
+.description {
+  width: 31rem;
+}
+
+p a {
+  color: #0053D0;
+  text-decoration: underline;
+  text-underline-offset: 2px;
+}
+
+.dark p a {
+  color: #70F0F9;
+}
+
+/* For Contact & Invitation Page */
+.primary-header-contact {
+  background: linear-gradient(251.16deg, #53c1ff 1.1%, #0053d0 100.82%);
+  -webkit-background-clip: text;
+  -webkit-text-fill-color: transparent;
+  background-clip: text;
+  text-shadow: 0px 4px 74px #e9e7e2;
+}
+
+.dark .primary-header-contact {
+  background: linear-gradient(270deg, #70F0F9 100%, #70F0F9 100%);
+  -webkit-background-clip: text;
+  -webkit-text-fill-color: transparent;
+  background-clip: text;
+  text-shadow: none;
+}
+
+.secondary-header-contact {
+  text-shadow: 0px 4px 74px #e9e7e2;
+}
+
+.dark .secondary-header-contact {
+  text-shadow: none;
+}
+
+.content_copy_with_tooltip {
+  background-color: #f8f8f6;
+  border-radius: 50px;
+  padding-bottom: 4px;
+  padding-top: 8px;
+  margin-top: 16px;
+  margin-bottom: 16px;
+}
+
+.content_copy_with_tooltip .tooltip {
+  vertical-align: -6px;
+}
+
+.content_copy_with_tooltip .content {
+  font-size: 15px;
+}
+
+.contact-tab>.contact-tab-content,
+.job-tab>.job-tab-content {
+  opacity: 0;
+  max-height: 0;
+  transition: all 0.5s ease;
+  visibility: hidden;
+  transform: translateY(10px);
+  overflow: hidden;
+}
+
+.contact-tab svg,
+.job-tab svg {
+  transform: rotate(-180deg);
+  transition: all .5s ease;
+}
+
+.contact-tab.active>.contact-tab-content,
+.job-tab.active>.job-tab-content {
+  opacity: 1;
+  max-height: 300px;
+  visibility: visible;
+  transform: translateY(0px);
+}
+
+.for-tablet .contact-tab.active>.contact-tab-content,
+.for-tablet .job-tab.active>.job-tab-content {
+  min-height: 450px;
+}
+
+.contact-tab.active svg,
+.contact-tab:hover svg,
+.job-tab.active svg,
+.job-tab:hover svg {
+  transform: rotate(0deg);
+}
+
+.d-none-if-js-disabled {
+  display: none !important;
+}

apps/common/Web/static/media/sun.svg

@@ -0,0 +1,11 @@
+<svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M23.9958 12.2815C23.9363 12.3954 23.8849 12.5146 23.8158 12.6224C23.5945 12.9674 23.2766 13.1624 22.8654 13.1685C22.2182 13.1782 21.5707 13.1764 20.9234 13.17C20.2781 13.1636 19.7772 12.6464 19.7773 11.9999C19.7774 11.3535 20.2754 10.8389 20.9237 10.8303C21.532 10.8221 22.1405 10.8258 22.7488 10.8278C23.3522 10.8298 23.7281 11.0908 23.9462 11.6508C23.956 11.6761 23.9789 11.6964 23.9958 11.719C23.9958 11.9064 23.9958 12.094 23.9958 12.2815Z" fill="white"/>
+<path d="M11.7154 24.0003C11.6217 23.9526 11.5256 23.9088 11.4345 23.8564C11.0545 23.6377 10.836 23.3104 10.8286 22.87C10.8175 22.2149 10.8179 21.5593 10.828 20.9042C10.8378 20.2738 11.3597 19.7812 11.9967 19.7812C12.6336 19.7812 13.155 20.2739 13.1654 20.9042C13.1757 21.5359 13.1717 22.168 13.1682 22.7998C13.1652 23.3392 12.8885 23.7369 12.3906 23.937C12.3509 23.9529 12.3153 23.979 12.2779 24.0003C12.0904 24.0003 11.9029 24.0003 11.7154 24.0003Z" fill="white"/>
+<path d="M17.2592 11.9958C17.2733 14.8825 14.9232 17.2468 12.0032 17.2612C9.11732 17.2754 6.75397 14.9264 6.73836 12.0041C6.72295 9.12027 9.07502 6.75326 11.9946 6.73835C14.8788 6.72363 17.2449 9.07587 17.2592 11.9958Z" stroke="white" stroke-width="1.5"/>
+<path d="M13.1693 2.11324C13.1692 2.43329 13.1744 2.75345 13.1682 3.07341C13.1555 3.7216 12.6425 4.21934 11.995 4.21864C11.3493 4.21789 10.8358 3.71808 10.828 3.06768C10.8204 2.42766 10.8201 1.78736 10.8283 1.14738C10.8365 0.500704 11.3562 -0.000843934 12.0007 1.06615e-06C12.6437 0.000846066 13.1564 0.504314 13.1684 1.15307C13.1743 1.47303 13.1694 1.79318 13.1693 2.11324Z" fill="white"/>
+<path d="M2.10878 13.1714C1.78877 13.1714 1.46872 13.1754 1.14885 13.1705C0.504832 13.1605 -0.000422735 12.6426 2.65407e-07 11.9987C0.000423265 11.3553 0.503376 10.838 1.15138 10.8301C1.79126 10.8223 2.43138 10.8222 3.07126 10.8303C3.72034 10.8385 4.21822 11.3541 4.21794 12.0012C4.21766 12.6477 3.71555 13.1609 3.06872 13.1706C2.7488 13.1753 2.42875 13.1714 2.10878 13.1714Z" fill="white"/>
+<path d="M6.85268 5.524C6.82732 6.152 6.60944 6.52005 6.16969 6.72981C5.73844 6.93552 5.29738 6.90378 4.94534 6.58208C4.41604 6.09838 3.90431 5.59148 3.42451 5.05894C3.02923 4.62023 3.09727 3.9209 3.51626 3.50792C3.9361 3.09409 4.63284 3.03567 5.06893 3.43194C5.59381 3.90888 6.09569 4.41446 6.57188 4.93996C6.73726 5.12252 6.79642 5.4014 6.85268 5.524Z" fill="white"/>
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apps/ntf-server/Main.hs

@@ -1,77 +1,20 @@
-{-# LANGUAGE DuplicateRecordFields #-}
-{-# LANGUAGE NamedFieldPuns #-}
-
 module Main where
 
 import Control.Logger.Simple
-import Simplex.Messaging.Client.Agent (defaultSMPClientAgentConfig)
-import Simplex.Messaging.Notifications.Server (runNtfServer)
-import Simplex.Messaging.Notifications.Server.Env (NtfServerConfig (..))
-import Simplex.Messaging.Notifications.Server.Push.APNS (defaultAPNSPushClientConfig)
-import Simplex.Messaging.Server.CLI (ServerCLIConfig (..), protocolServerCLI)
-import System.FilePath (combine)
+import Simplex.Messaging.Server.CLI (getEnvPath)
+import Simplex.Messaging.Notifications.Server.Main
 
-cfgPath :: FilePath
-cfgPath = "/etc/opt/simplex-notifications"
+defaultCfgPath :: FilePath
+defaultCfgPath = "/etc/opt/simplex-notifications"
 
-logPath :: FilePath
-logPath = "/var/opt/simplex-notifications"
+defaultLogPath :: FilePath
+defaultLogPath = "/var/opt/simplex-notifications"
 
 logCfg :: LogConfig
 logCfg = LogConfig {lc_file = Nothing, lc_stderr = True}
 
 main :: IO ()
 main = do
-  setLogLevel LogDebug -- change to LogError in production
-  withGlobalLogging logCfg $ protocolServerCLI ntfServerCLIConfig runNtfServer
-
-ntfServerCLIConfig :: ServerCLIConfig NtfServerConfig
-ntfServerCLIConfig =
-  let caCrtFile = combine cfgPath "ca.crt"
-      serverKeyFile = combine cfgPath "server.key"
-      serverCrtFile = combine cfgPath "server.crt"
-   in ServerCLIConfig
-        { cfgDir = cfgPath,
-          logDir = logPath,
-          iniFile = combine cfgPath "ntf-server.ini",
-          storeLogFile = combine logPath "ntf-server-store.log",
-          caKeyFile = combine cfgPath "ca.key",
-          caCrtFile,
-          serverKeyFile,
-          serverCrtFile,
-          fingerprintFile = combine cfgPath "fingerprint",
-          defaultServerPort = "443",
-          executableName = "ntf-server",
-          serverVersion = "SMP notifications server v1.1.1",
-          mkIniFile = \enableStoreLog defaultServerPort ->
-            "[STORE_LOG]\n\
-            \# The server uses STM memory for persistence,\n\
-            \# that will be lost on restart (e.g., as with redis).\n\
-            \# This option enables saving memory to append only log,\n\
-            \# and restoring it when the server is started.\n\
-            \# Log is compacted on start (deleted objects are removed).\n\
-            \# The messages are not logged.\n"
-              <> ("enable: " <> (if enableStoreLog then "on" else "off") <> "\n\n")
-              <> "[TRANSPORT]\n\
-                 \port: "
-              <> defaultServerPort
-              <> "\n\
-                 \websockets: off\n",
-          mkServerConfig = \storeLogFile transports _ ->
-            NtfServerConfig
-              { transports,
-                subIdBytes = 24,
-                regCodeBytes = 32,
-                clientQSize = 16,
-                subQSize = 64,
-                pushQSize = 128,
-                smpAgentCfg = defaultSMPClientAgentConfig,
-                apnsConfig = defaultAPNSPushClientConfig,
-                inactiveClientExpiration = Nothing,
-                storeLogFile,
-                resubscribeDelay = 50000, -- 50ms
-                caCertificateFile = caCrtFile,
-                privateKeyFile = serverKeyFile,
-                certificateFile = serverCrtFile
-              }
-        }
+  cfgPath <- getEnvPath "NTF_SERVER_CFG_PATH" defaultCfgPath
+  logPath <- getEnvPath "NTF_SERVER_LOG_PATH" defaultLogPath
+  withGlobalLogging logCfg $ ntfServerCLI cfgPath logPath

apps/smp-agent/Main.hs

@@ -1,30 +1,46 @@
 {-# LANGUAGE DuplicateRecordFields #-}
+{-# LANGUAGE NamedFieldPuns #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE TypeApplications #-}
 
 module Main where
 
 import Control.Logger.Simple
+import Data.ByteArray (ScrubbedBytes)
 import qualified Data.List.NonEmpty as L
+import qualified Data.Map.Strict as M
 import Simplex.Messaging.Agent.Env.SQLite
 import Simplex.Messaging.Agent.Server (runSMPAgent)
+import Simplex.Messaging.Agent.Store.SQLite (MigrationConfirmation (..))
+import Simplex.Messaging.Client (defaultNetworkConfig)
 import Simplex.Messaging.Transport (TLS, Transport (..))
 
 cfg :: AgentConfig
 cfg = defaultAgentConfig
 
+agentDbFile :: String
+agentDbFile = "smp-agent.db"
+
+agentDbKey :: ScrubbedBytes
+agentDbKey = ""
+
 servers :: InitialAgentServers
 servers =
   InitialAgentServers
-    { smp = L.fromList ["smp://bU0K-bRg24xWW__lS0umO1Zdw_SXqpJNtm1_RrPLViE=@localhost:5223"],
-      ntf = []
+    { smp = M.fromList [(1, L.fromList ["smp://bU0K-bRg24xWW__lS0umO1Zdw_SXqpJNtm1_RrPLViE=@localhost:5223"])],
+      ntf = [],
+      xftp = M.empty,
+      netCfg = defaultNetworkConfig
     }
 
 logCfg :: LogConfig
 logCfg = LogConfig {lc_file = Nothing, lc_stderr = True}
 
+-- Warning: this SMP agent server is experimental - it does not work correctly with multiple connected TCP clients in some cases.
 main :: IO ()
 main = do
-  putStrLn $ "SMP agent listening on port " ++ tcpPort (cfg :: AgentConfig)
+  let AgentConfig {tcpPort} = cfg
+  putStrLn $ maybe (error "no agent port") (\port -> "SMP agent listening on port " ++ port) tcpPort
   setLogLevel LogInfo -- LogError
-  withGlobalLogging logCfg $ runSMPAgent (transport @TLS) cfg servers
+  Right st <- createAgentStore agentDbFile agentDbKey False MCConsole
+  withGlobalLogging logCfg $ runSMPAgent (transport @TLS) cfg servers st

apps/smp-server/Main.hs

@@ -1,110 +1,22 @@
-{-# LANGUAGE DuplicateRecordFields #-}
-{-# LANGUAGE NamedFieldPuns #-}
-{-# LANGUAGE NumericUnderscores #-}
-{-# LANGUAGE OverloadedStrings #-}
-{-# LANGUAGE TypeApplications #-}
-
 module Main where
 
 import Control.Logger.Simple
-import Data.Functor (($>))
-import Data.Ini (lookupValue)
-import Simplex.Messaging.Server (runSMPServer)
-import Simplex.Messaging.Server.CLI (ServerCLIConfig (..), protocolServerCLI, readStrictIni)
-import Simplex.Messaging.Server.Env.STM (ServerConfig (..), defaultInactiveClientExpiration, defaultMessageExpiration)
-import Simplex.Messaging.Server.Expiration
-import Simplex.Messaging.Transport (simplexMQVersion, supportedSMPServerVRange)
-import System.FilePath (combine)
+import Simplex.Messaging.Server.CLI (getEnvPath)
+import Simplex.Messaging.Server.Main (smpServerCLI_)
+import Simplex.Messaging.Server.Web (serveStaticFiles, attachStaticFiles)
+import SMPWeb (smpGenerateSite)
 
-cfgPath :: FilePath
-cfgPath = "/etc/opt/simplex"
+defaultCfgPath :: FilePath
+defaultCfgPath = "/etc/opt/simplex"
 
-logPath :: FilePath
-logPath = "/var/opt/simplex"
+defaultLogPath :: FilePath
+defaultLogPath = "/var/opt/simplex"
 
 logCfg :: LogConfig
 logCfg = LogConfig {lc_file = Nothing, lc_stderr = True}
 
 main :: IO ()
 main = do
-  setLogLevel LogInfo
-  withGlobalLogging logCfg . protocolServerCLI smpServerCLIConfig $ \cfg@ServerConfig {inactiveClientExpiration} -> do
-    putStrLn $ case inactiveClientExpiration of
-      Just ExpirationConfig {ttl, checkInterval} -> "expiring clients inactive for " <> show ttl <> " seconds every " <> show checkInterval <> " seconds"
-      _ -> "not expiring inactive clients"
-    runSMPServer cfg
-
-smpServerCLIConfig :: ServerCLIConfig ServerConfig
-smpServerCLIConfig =
-  let caCrtFile = combine cfgPath "ca.crt"
-      serverKeyFile = combine cfgPath "server.key"
-      serverCrtFile = combine cfgPath "server.crt"
-   in ServerCLIConfig
-        { cfgDir = cfgPath,
-          logDir = logPath,
-          iniFile = combine cfgPath "smp-server.ini",
-          storeLogFile = combine logPath "smp-server-store.log",
-          caKeyFile = combine cfgPath "ca.key",
-          caCrtFile,
-          serverKeyFile,
-          serverCrtFile,
-          fingerprintFile = combine cfgPath "fingerprint",
-          defaultServerPort = "5223",
-          executableName = "smp-server",
-          serverVersion = "SMP server v" <> simplexMQVersion,
-          mkIniFile = \enableStoreLog defaultServerPort ->
-            "[STORE_LOG]\n\
-            \# The server uses STM memory for persistence,\n\
-            \# that will be lost on restart (e.g., as with redis).\n\
-            \# This option enables saving memory to append only log,\n\
-            \# and restoring it when the server is started.\n\
-            \# Log is compacted on start (deleted objects are removed).\n"
-              <> ("enable: " <> (if enableStoreLog then "on" else "off") <> "\n")
-              <> "# Undelivered messages are optionally saved and restored when the server restarts,\n\
-                 \# they are preserved in the .bak file until the next restart.\n"
-              <> ("restore_messages: " <> (if enableStoreLog then "on" else "off") <> "\n")
-              <> ("log_stats: off\n\n")
-              <> "[TRANSPORT]\n"
-              <> ("port: " <> defaultServerPort <> "\n")
-              <> "websockets: off\n\n"
-              <> "[INACTIVE_CLIENTS]\n\
-                 \# TTL and interval to check inactive clients\n\
-                 \disconnect: off\n"
-              <> ("# ttl: " <> show (ttl defaultInactiveClientExpiration) <> "\n")
-              <> ("# check_interval: " <> show (checkInterval defaultInactiveClientExpiration) <> "\n"),
-          mkServerConfig = \storeLogFile transports ini ->
-            let settingIsOn section name = if lookupValue section name ini == Right "on" then Just () else Nothing
-                logStats = settingIsOn "STORE_LOG" "log_stats"
-             in ServerConfig
-                  { transports,
-                    tbqSize = 16,
-                    serverTbqSize = 64,
-                    msgQueueQuota = 128,
-                    queueIdBytes = 24,
-                    msgIdBytes = 24, -- must be at least 24 bytes, it is used as 192-bit nonce for XSalsa20
-                    caCertificateFile = caCrtFile,
-                    privateKeyFile = serverKeyFile,
-                    certificateFile = serverCrtFile,
-                    storeLogFile,
-                    storeMsgsFile =
-                      let messagesPath = combine logPath "smp-server-messages.log"
-                       in case lookupValue "STORE_LOG" "restore_messages" ini of
-                            Right "on" -> Just messagesPath
-                            Right _ -> Nothing
-                            -- if the setting is not set, it is enabled when store log is enabled
-                            _ -> storeLogFile $> messagesPath,
-                    allowNewQueues = True,
-                    messageExpiration = Just defaultMessageExpiration,
-                    inactiveClientExpiration =
-                      settingIsOn "INACTIVE_CLIENTS" "disconnect"
-                        $> ExpirationConfig
-                          { ttl = readStrictIni "INACTIVE_CLIENTS" "ttl" ini,
-                            checkInterval = readStrictIni "INACTIVE_CLIENTS" "check_interval" ini
-                          },
-                    logStatsInterval = logStats $> 86400, -- seconds
-                    logStatsStartTime = 0, -- seconds from 00:00 UTC
-                    serverStatsLogFile = combine logPath "smp-server-stats.daily.log",
-                    serverStatsBackupFile = logStats $> combine logPath "smp-server-stats.log",
-                    smpServerVRange = supportedSMPServerVRange
-                  }
-        }
+  cfgPath <- getEnvPath "SMP_SERVER_CFG_PATH" defaultCfgPath
+  logPath <- getEnvPath "SMP_SERVER_LOG_PATH" defaultLogPath
+  withGlobalLogging logCfg $ smpServerCLI_ smpGenerateSite serveStaticFiles attachStaticFiles cfgPath logPath

apps/smp-server/SMPWeb.hs

@@ -0,0 +1,43 @@
+{-# LANGUAGE NamedFieldPuns #-}
+{-# LANGUAGE OverloadedStrings #-}
+
+module SMPWeb
+  ( smpGenerateSite,
+    serverInformation,
+  ) where
+
+import Data.ByteString (ByteString)
+import Data.String (fromString)
+import Web.Embedded (embeddedContent)
+import Simplex.Messaging.Encoding.String (strEncode)
+import Simplex.Messaging.Server.Information
+import Simplex.Messaging.Server.Main (simplexmqSource)
+import qualified Simplex.Messaging.Server.Web as Web
+import Simplex.Messaging.Server.Web (render, serverInfoSubsts, timedTTLText)
+import Simplex.Messaging.Transport.Client (TransportHost (..))
+
+smpGenerateSite :: ServerInformation -> Maybe TransportHost -> FilePath -> IO ()
+smpGenerateSite si onionHost path =
+  Web.generateSite embeddedContent (serverInformation si onionHost) smpLinkPages path
+
+smpLinkPages :: [String]
+smpLinkPages = ["contact", "invitation", "a", "c", "g", "r", "i"]
+
+serverInformation :: ServerInformation -> Maybe TransportHost -> ByteString
+serverInformation ServerInformation {config, information} onionHost = render (Web.indexHtml embeddedContent) substs
+  where
+    substs = [("smpConfig", Just "y"), ("xftpConfig", Nothing)] <> substConfig <> serverInfoSubsts simplexmqSource information <> [("onionHost", strEncode <$> onionHost), ("iniFileName", Just "smp-server.ini")]
+    substConfig =
+      [ ( "persistence",
+          Just $ case persistence config of
+            SPMMemoryOnly -> "In-memory only"
+            SPMQueues -> "Queues"
+            SPMMessages -> "Queues and messages"
+        ),
+        ("messageExpiration", Just $ maybe "Never" (fromString . timedTTLText) $ messageExpiration config),
+        ("statsEnabled", Just . yesNo $ statsEnabled config),
+        ("newQueuesAllowed", Just . yesNo $ newQueuesAllowed config),
+        ("basicAuthEnabled", Just . yesNo $ basicAuthEnabled config)
+      ]
+    yesNo True = "Yes"
+    yesNo False = "No"

apps/xftp-server/Main.hs

@@ -0,0 +1,23 @@
+module Main where
+
+import Control.Logger.Simple
+import Simplex.FileTransfer.Server.Main (xftpServerCLI_)
+import Simplex.Messaging.Server.CLI (getEnvPath)
+import Simplex.Messaging.Server.Web (serveStaticFiles)
+import XFTPWeb (xftpGenerateSite)
+
+defaultCfgPath :: FilePath
+defaultCfgPath = "/etc/opt/simplex-xftp"
+
+defaultLogPath :: FilePath
+defaultLogPath = "/var/opt/simplex-xftp"
+
+logCfg :: LogConfig
+logCfg = LogConfig {lc_file = Nothing, lc_stderr = True}
+
+main :: IO ()
+main = do
+  setLogLevel LogDebug -- change to LogError in production
+  cfgPath <- getEnvPath "XFTP_SERVER_CFG_PATH" defaultCfgPath
+  logPath <- getEnvPath "XFTP_SERVER_LOG_PATH" defaultLogPath
+  withGlobalLogging logCfg $ xftpServerCLI_ xftpGenerateSite serveStaticFiles cfgPath logPath

apps/xftp-server/XFTPWeb.hs

@@ -0,0 +1,67 @@
+{-# LANGUAGE NamedFieldPuns #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE TemplateHaskell #-}
+
+module XFTPWeb
+  ( xftpGenerateSite,
+    xftpServerInformation,
+  ) where
+
+import Control.Monad (forM_)
+import qualified Data.ByteString.Char8 as B
+import Data.ByteString (ByteString)
+import Data.FileEmbed (embedDir, embedFile)
+import Data.Maybe (isJust)
+import Data.String (fromString)
+import Web.Embedded (embeddedContent)
+import Simplex.FileTransfer.Server.Env (XFTPServerConfig (..))
+import Simplex.Messaging.Encoding.String (strEncode)
+import Simplex.Messaging.Server.Expiration (ExpirationConfig (..))
+import Simplex.Messaging.Server.Information (ServerPublicInfo)
+import Simplex.Messaging.Server.Main (simplexmqSource)
+import qualified Simplex.Messaging.Server.Web as Web
+import Simplex.Messaging.Server.Web (render, serverInfoSubsts, timedTTLText)
+import Simplex.Messaging.Transport.Client (TransportHost (..))
+import System.Directory (createDirectoryIfMissing)
+import System.FilePath ((</>))
+
+xftpWebContent :: [(FilePath, ByteString)]
+xftpWebContent = $(embedDir "apps/xftp-server/static/xftp-web-bundle/")
+
+xftpMediaContent :: [(FilePath, ByteString)]
+xftpMediaContent = $(embedDir "apps/xftp-server/static/media/")
+
+xftpFilePageHtml :: ByteString
+xftpFilePageHtml = $(embedFile "apps/xftp-server/static/file.html")
+
+xftpGenerateSite :: XFTPServerConfig s -> Maybe ServerPublicInfo -> Maybe TransportHost -> FilePath -> IO ()
+xftpGenerateSite cfg info onionHost path = do
+  let substs = xftpSubsts cfg info onionHost
+  Web.generateSite embeddedContent (render (Web.indexHtml embeddedContent) substs) [] path
+  let xftpDir = path </> "xftp-web-bundle"
+      mediaDir = path </> "media"
+      fileDir = path </> "file"
+  filePage xftpDir xftpWebContent
+  filePage mediaDir xftpMediaContent
+  createDirectoryIfMissing True fileDir
+  B.writeFile (fileDir </> "index.html") $ render xftpFilePageHtml substs
+  where
+    filePage dir content_ = do
+      createDirectoryIfMissing True dir
+      forM_ content_ $ \(fp, content) -> B.writeFile (dir </> fp) content
+
+xftpServerInformation :: XFTPServerConfig s -> Maybe ServerPublicInfo -> Maybe TransportHost -> ByteString
+xftpServerInformation cfg info onionHost = render (Web.indexHtml embeddedContent) (xftpSubsts cfg info onionHost)
+
+xftpSubsts :: XFTPServerConfig s -> Maybe ServerPublicInfo -> Maybe TransportHost -> [(ByteString, Maybe ByteString)]
+xftpSubsts XFTPServerConfig {fileExpiration, logStatsInterval, allowNewFiles, newFileBasicAuth} information onionHost =
+  [("smpConfig", Nothing), ("xftpConfig", Just "y")] <> substConfig <> serverInfoSubsts simplexmqSource information <> [("onionHost", strEncode <$> onionHost), ("iniFileName", Just "file-server.ini")]
+  where
+    substConfig =
+      [ ("fileExpiration", Just $ maybe "Never" (fromString . timedTTLText . ttl) fileExpiration),
+        ("statsEnabled", Just . yesNo $ isJust logStatsInterval),
+        ("newUploadsAllowed", Just . yesNo $ allowNewFiles),
+        ("basicAuthEnabled", Just . yesNo $ isJust newFileBasicAuth)
+      ]
+    yesNo True = "Yes"
+    yesNo False = "No"

apps/xftp-server/static/media/xftp-protocol-dark.svg

@@ -0,0 +1,115 @@
+<svg width="440" height="520" viewBox="-20 0 440 520" fill="none" xmlns="http://www.w3.org/2000/svg">
+  <!-- Sender browser -->
+  <rect x="120" y="16" width="160" height="56" rx="10" stroke="#70F0F9" stroke-width="1.5"/>
+  <text x="200" y="40" text-anchor="middle" font-family="system-ui, sans-serif" font-size="13" font-weight="600" fill="#70F0F9">Sender's browser</text>
+  <text x="200" y="56" text-anchor="middle" font-family="system-ui, sans-serif" font-size="11" fill="rgba(112,240,249,0.7)">encrypts file</text>
+
+  <!-- Arrow down from sender to chunks -->
+  <line x1="200" y1="72" x2="200" y2="120" stroke="#70F0F9" stroke-width="1.5" marker-end="url(#arrowC)"/>
+
+  <!-- Chunks row -->
+  <rect x="112" y="120" width="176" height="40" rx="8" fill="none" stroke="#70F0F9" stroke-width="1" stroke-dasharray="4 3"/>
+  <text x="200" y="145" text-anchor="middle" font-family="system-ui, sans-serif" font-size="12" fill="#70F0F9">encrypted chunks</text>
+
+  <!-- Arrows from chunks to routers -->
+  <line x1="152" y1="160" x2="80" y2="220" stroke="#70F0F9" stroke-width="1.5" marker-end="url(#arrowC)"/>
+  <line x1="200" y1="160" x2="200" y2="220" stroke="#70F0F9" stroke-width="1.5" marker-end="url(#arrowC)"/>
+  <line x1="248" y1="160" x2="320" y2="220" stroke="#70F0F9" stroke-width="1.5" marker-end="url(#arrowC)"/>
+
+  <!-- Router 1 (SimpleX) -->
+  <rect x="20" y="220" width="120" height="56" rx="6" fill="none" stroke="#70F0F9" stroke-width="1.5"/>
+  <g transform="translate(28, 227)">
+    <rect width="14" height="4" rx="1" fill="rgba(112,240,249,0.5)"/>
+    <rect y="6" width="14" height="4" rx="1" fill="rgba(112,240,249,0.5)"/>
+    <rect y="12" width="14" height="4" rx="1" fill="rgba(112,240,249,0.5)"/>
+    <circle cx="11" cy="2" r="1" fill="#70F0F9"/>
+    <circle cx="11" cy="8" r="1" fill="#70F0F9"/>
+    <circle cx="11" cy="14" r="1" fill="#70F0F9"/>
+  </g>
+  <text x="80" y="244" text-anchor="middle" font-family="system-ui, sans-serif" font-size="11" font-weight="600" fill="#70F0F9">SimpleX</text>
+  <text x="80" y="258" text-anchor="middle" font-family="system-ui, sans-serif" font-size="9" fill="rgba(112,240,249,0.7)">XFTP router</text>
+
+  <!-- Router 2 (Flux) -->
+  <rect x="155" y="220" width="90" height="56" rx="6" fill="none" stroke="#70F0F9" stroke-width="1.5"/>
+  <g transform="translate(163, 227)">
+    <rect width="14" height="4" rx="1" fill="rgba(112,240,249,0.5)"/>
+    <rect y="6" width="14" height="4" rx="1" fill="rgba(112,240,249,0.5)"/>
+    <rect y="12" width="14" height="4" rx="1" fill="rgba(112,240,249,0.5)"/>
+    <circle cx="11" cy="2" r="1" fill="#70F0F9"/>
+    <circle cx="11" cy="8" r="1" fill="#70F0F9"/>
+    <circle cx="11" cy="14" r="1" fill="#70F0F9"/>
+  </g>
+  <text x="200" y="244" text-anchor="middle" font-family="system-ui, sans-serif" font-size="11" font-weight="600" fill="#70F0F9">Flux</text>
+  <text x="200" y="258" text-anchor="middle" font-family="system-ui, sans-serif" font-size="9" fill="rgba(112,240,249,0.7)">XFTP router</text>
+
+  <!-- Router 3 (SimpleX) -->
+  <rect x="260" y="220" width="120" height="56" rx="6" fill="none" stroke="#70F0F9" stroke-width="1.5"/>
+  <g transform="translate(268, 227)">
+    <rect width="14" height="4" rx="1" fill="rgba(112,240,249,0.5)"/>
+    <rect y="6" width="14" height="4" rx="1" fill="rgba(112,240,249,0.5)"/>
+    <rect y="12" width="14" height="4" rx="1" fill="rgba(112,240,249,0.5)"/>
+    <circle cx="11" cy="2" r="1" fill="#70F0F9"/>
+    <circle cx="11" cy="8" r="1" fill="#70F0F9"/>
+    <circle cx="11" cy="14" r="1" fill="#70F0F9"/>
+  </g>
+  <text x="320" y="244" text-anchor="middle" font-family="system-ui, sans-serif" font-size="11" font-weight="600" fill="#70F0F9">SimpleX</text>
+  <text x="320" y="258" text-anchor="middle" font-family="system-ui, sans-serif" font-size="9" fill="rgba(112,240,249,0.7)">XFTP router</text>
+
+  <!-- Arrows from routers down -->
+  <line x1="80" y1="276" x2="152" y2="336" stroke="#70F0F9" stroke-width="1.5" marker-end="url(#arrowC)"/>
+  <line x1="200" y1="276" x2="200" y2="336" stroke="#70F0F9" stroke-width="1.5" marker-end="url(#arrowC)"/>
+  <line x1="320" y1="276" x2="248" y2="336" stroke="#70F0F9" stroke-width="1.5" marker-end="url(#arrowC)"/>
+
+  <!-- Re-encrypt label -->
+  <text x="330" y="310" text-anchor="start" font-family="system-ui, sans-serif" font-size="10" fill="rgba(112,240,249,0.7)">re-encrypted</text>
+  <text x="330" y="322" text-anchor="start" font-family="system-ui, sans-serif" font-size="10" fill="rgba(112,240,249,0.7)">per recipient</text>
+
+  <!-- Chunks row (download) -->
+  <rect x="112" y="336" width="176" height="40" rx="8" fill="none" stroke="#70F0F9" stroke-width="1" stroke-dasharray="4 3"/>
+  <text x="200" y="361" text-anchor="middle" font-family="system-ui, sans-serif" font-size="12" fill="#70F0F9">encrypted chunks</text>
+
+  <!-- Arrow down to recipient -->
+  <line x1="200" y1="376" x2="200" y2="424" stroke="#70F0F9" stroke-width="1.5" marker-end="url(#arrowC)"/>
+
+  <!-- Recipient browser -->
+  <rect x="120" y="424" width="160" height="56" rx="10" stroke="#70F0F9" stroke-width="1.5"/>
+  <text x="200" y="448" text-anchor="middle" font-family="system-ui, sans-serif" font-size="13" font-weight="600" fill="#70F0F9">Recipient's browser</text>
+  <text x="200" y="464" text-anchor="middle" font-family="system-ui, sans-serif" font-size="11" fill="rgba(112,240,249,0.7)">decrypts file</text>
+
+  <!-- Key path (dashed, side) -->
+  <path d="M120 44 L8 44 L8 452 L120 452" stroke="#70F0F9" stroke-width="1.5" stroke-dasharray="6 4" fill="none" marker-end="url(#arrowC)"/>
+  <text x="-6" y="240" text-anchor="middle" font-family="system-ui, sans-serif" font-size="10" fill="#70F0F9" transform="rotate(-90 -6 240)">key in URL fragment - never sent to page server or data router</text>
+
+
+  <!-- Closed padlock: encryption (between sender and chunks) -->
+  <g transform="translate(192, 88)">
+    <path d="M4,7 V4 C4,1.2 12,1.2 12,4 V7" stroke="#60a5fa" stroke-width="1.5" fill="none" stroke-linecap="round"/>
+    <rect x="2" y="7" width="12" height="9" rx="2" fill="#60a5fa"/>
+    <circle cx="8" cy="12" r="1.2" fill="#0B2A59"/>
+  </g>
+
+  <!-- Open padlock: decryption (between chunks and recipient) -->
+  <g transform="translate(192, 392)">
+    <path d="M4,7 V4 C4,1.2 12,1.2 12,4 V2" stroke="#60a5fa" stroke-width="1.5" fill="none" stroke-linecap="round"/>
+    <rect x="2" y="7" width="12" height="9" rx="2" fill="#60a5fa"/>
+    <circle cx="8" cy="12" r="1.2" fill="#0B2A59"/>
+  </g>
+
+  <!-- Key icon on dashed line -->
+  <g transform="translate(8, 410)">
+    <circle cx="0" cy="0" r="6" stroke="#FBBF24" stroke-width="2" fill="#FBBF24"/>
+    <circle cx="0" cy="0" r="2" fill="#0B2A59"/>
+    <line x1="6" y1="0" x2="16" y2="0" stroke="#FBBF24" stroke-width="2"/>
+    <line x1="14" y1="0" x2="14" y2="4" stroke="#FBBF24" stroke-width="2"/>
+    <line x1="11" y1="0" x2="11" y2="3.5" stroke="#FBBF24" stroke-width="2"/>
+  </g>
+
+  <!-- Annotation: no shared IDs -->
+  <text x="200" y="510" text-anchor="middle" font-family="system-ui, sans-serif" font-size="10" fill="rgba(112,240,249,0.7)">Each file fragment uses unique anonymous credentials - no shared identifiers</text>
+
+  <defs>
+    <marker id="arrowC" viewBox="0 0 10 10" refX="9" refY="5" markerWidth="6" markerHeight="6" orient="auto-start-reverse">
+      <path d="M 0 0 L 10 5 L 0 10 z" fill="#70F0F9"/>
+    </marker>
+  </defs>
+</svg>

apps/xftp-server/static/media/xftp-protocol.svg

@@ -0,0 +1,130 @@
+<svg width="440" height="520" viewBox="-20 0 440 520" fill="none" xmlns="http://www.w3.org/2000/svg">
+  <!-- Sender browser -->
+  <rect x="120" y="16" width="160" height="56" rx="10" fill="url(#gBox)" stroke="#606C71" stroke-width="1.5"/>
+  <text x="200" y="40" text-anchor="middle" font-family="system-ui, sans-serif" font-size="13" font-weight="600" fill="#fff">Sender's browser</text>
+  <text x="200" y="56" text-anchor="middle" font-family="system-ui, sans-serif" font-size="11" fill="rgba(255,255,255,0.8)">encrypts file</text>
+
+  <!-- Arrow down from sender to chunks -->
+  <line x1="200" y1="72" x2="200" y2="120" stroke="#606C71" stroke-width="1.5" marker-end="url(#arrowG)"/>
+
+  <!-- Chunks row -->
+  <rect x="112" y="120" width="176" height="40" rx="8" fill="#f0f7ff" stroke="#0053D0" stroke-width="1" stroke-dasharray="4 3"/>
+  <text x="200" y="145" text-anchor="middle" font-family="system-ui, sans-serif" font-size="12" fill="#0053D0">encrypted chunks</text>
+
+  <!-- Arrows from chunks to routers -->
+  <line x1="152" y1="160" x2="80" y2="220" stroke="#606C71" stroke-width="1.5" marker-end="url(#arrowG)"/>
+  <line x1="200" y1="160" x2="200" y2="220" stroke="#606C71" stroke-width="1.5" marker-end="url(#arrowG)"/>
+  <line x1="248" y1="160" x2="320" y2="220" stroke="#606C71" stroke-width="1.5" marker-end="url(#arrowG)"/>
+
+  <!-- Router 1 (SimpleX) -->
+  <rect x="20" y="220" width="120" height="56" rx="6" fill="#f0f4f8" stroke="#606C71" stroke-width="1.5"/>
+  <g transform="translate(28, 227)">
+    <rect width="14" height="4" rx="1" fill="#606C71"/>
+    <rect y="6" width="14" height="4" rx="1" fill="#606C71"/>
+    <rect y="12" width="14" height="4" rx="1" fill="#606C71"/>
+    <circle cx="11" cy="2" r="1" fill="#53C1FF"/>
+    <circle cx="11" cy="8" r="1" fill="#53C1FF"/>
+    <circle cx="11" cy="14" r="1" fill="#53C1FF"/>
+  </g>
+  <text x="80" y="244" text-anchor="middle" font-family="system-ui, sans-serif" font-size="11" font-weight="600" fill="#3F484B">SimpleX</text>
+  <text x="80" y="258" text-anchor="middle" font-family="system-ui, sans-serif" font-size="9" fill="#606C71">XFTP router</text>
+
+  <!-- Router 2 (Flux) -->
+  <rect x="155" y="220" width="90" height="56" rx="6" fill="#f0f4f8" stroke="#606C71" stroke-width="1.5"/>
+  <g transform="translate(163, 227)">
+    <rect width="14" height="4" rx="1" fill="#606C71"/>
+    <rect y="6" width="14" height="4" rx="1" fill="#606C71"/>
+    <rect y="12" width="14" height="4" rx="1" fill="#606C71"/>
+    <circle cx="11" cy="2" r="1" fill="#53C1FF"/>
+    <circle cx="11" cy="8" r="1" fill="#53C1FF"/>
+    <circle cx="11" cy="14" r="1" fill="#53C1FF"/>
+  </g>
+  <text x="200" y="244" text-anchor="middle" font-family="system-ui, sans-serif" font-size="11" font-weight="600" fill="#3F484B">Flux</text>
+  <text x="200" y="258" text-anchor="middle" font-family="system-ui, sans-serif" font-size="9" fill="#606C71">XFTP router</text>
+
+  <!-- Router 3 (SimpleX) -->
+  <rect x="260" y="220" width="120" height="56" rx="6" fill="#f0f4f8" stroke="#606C71" stroke-width="1.5"/>
+  <g transform="translate(268, 227)">
+    <rect width="14" height="4" rx="1" fill="#606C71"/>
+    <rect y="6" width="14" height="4" rx="1" fill="#606C71"/>
+    <rect y="12" width="14" height="4" rx="1" fill="#606C71"/>
+    <circle cx="11" cy="2" r="1" fill="#53C1FF"/>
+    <circle cx="11" cy="8" r="1" fill="#53C1FF"/>
+    <circle cx="11" cy="14" r="1" fill="#53C1FF"/>
+  </g>
+  <text x="320" y="244" text-anchor="middle" font-family="system-ui, sans-serif" font-size="11" font-weight="600" fill="#3F484B">SimpleX</text>
+  <text x="320" y="258" text-anchor="middle" font-family="system-ui, sans-serif" font-size="9" fill="#606C71">XFTP router</text>
+
+  <!-- Arrows from routers down -->
+  <line x1="80" y1="276" x2="152" y2="336" stroke="#606C71" stroke-width="1.5" marker-end="url(#arrowG)"/>
+  <line x1="200" y1="276" x2="200" y2="336" stroke="#606C71" stroke-width="1.5" marker-end="url(#arrowG)"/>
+  <line x1="320" y1="276" x2="248" y2="336" stroke="#606C71" stroke-width="1.5" marker-end="url(#arrowG)"/>
+
+  <!-- Re-encrypt label -->
+  <text x="330" y="310" text-anchor="start" font-family="system-ui, sans-serif" font-size="10" fill="#606C71">re-encrypted</text>
+  <text x="330" y="322" text-anchor="start" font-family="system-ui, sans-serif" font-size="10" fill="#606C71">per recipient</text>
+
+  <!-- Chunks row (download) -->
+  <rect x="112" y="336" width="176" height="40" rx="8" fill="#f0f7ff" stroke="#0053D0" stroke-width="1" stroke-dasharray="4 3"/>
+  <text x="200" y="361" text-anchor="middle" font-family="system-ui, sans-serif" font-size="12" fill="#0053D0">encrypted chunks</text>
+
+  <!-- Arrow down to recipient -->
+  <line x1="200" y1="376" x2="200" y2="424" stroke="#606C71" stroke-width="1.5" marker-end="url(#arrowG)"/>
+
+  <!-- Recipient browser -->
+  <rect x="120" y="424" width="160" height="56" rx="10" fill="url(#gBox)" stroke="#606C71" stroke-width="1.5"/>
+  <text x="200" y="448" text-anchor="middle" font-family="system-ui, sans-serif" font-size="13" font-weight="600" fill="#fff">Recipient's browser</text>
+  <text x="200" y="464" text-anchor="middle" font-family="system-ui, sans-serif" font-size="11" fill="rgba(255,255,255,0.8)">decrypts file</text>
+
+  <!-- Key path (dashed, side) -->
+  <path d="M120 44 L8 44 L8 452 L120 452" stroke="#0053D0" stroke-width="1.5" stroke-dasharray="6 4" fill="none" marker-end="url(#arrowB)"/>
+  <text x="-6" y="240" text-anchor="middle" font-family="system-ui, sans-serif" font-size="10" fill="#0053D0" transform="rotate(-90 -6 240)">key in URL fragment - never sent to page server or data router</text>
+
+
+  <!-- Closed padlock: encryption (between sender and chunks) -->
+  <g transform="translate(192, 88)">
+    <path d="M4,7 V4 C4,1.2 12,1.2 12,4 V7" stroke="#0053D0" stroke-width="1.5" fill="none" stroke-linecap="round"/>
+    <rect x="2" y="7" width="12" height="9" rx="2" fill="#0053D0"/>
+    <circle cx="8" cy="12" r="1.2" fill="#fff"/>
+  </g>
+
+  <!-- Open padlock: decryption (between chunks and recipient) -->
+  <g transform="translate(192, 392)">
+    <path d="M4,7 V4 C4,1.2 12,1.2 12,4 V2" stroke="#0053D0" stroke-width="1.5" fill="none" stroke-linecap="round"/>
+    <rect x="2" y="7" width="12" height="9" rx="2" fill="#0053D0"/>
+    <circle cx="8" cy="12" r="1.2" fill="#fff"/>
+  </g>
+
+  <!-- Key icon on dashed line -->
+  <g transform="translate(8, 410)">
+    <circle cx="0" cy="0" r="6" stroke="#D97706" stroke-width="2" fill="#D97706"/>
+    <circle cx="0" cy="0" r="2" fill="#fff"/>
+    <line x1="6" y1="0" x2="16" y2="0" stroke="#D97706" stroke-width="2"/>
+    <line x1="14" y1="0" x2="14" y2="4" stroke="#D97706" stroke-width="2"/>
+    <line x1="11" y1="0" x2="11" y2="3.5" stroke="#D97706" stroke-width="2"/>
+  </g>
+
+  <!-- Annotation: no shared IDs -->
+  <text x="200" y="510" text-anchor="middle" font-family="system-ui, sans-serif" font-size="10" fill="#606C71">Each file fragment uses unique anonymous credentials - no shared identifiers</text>
+
+  <defs>
+    <linearGradient id="gBox" x1="120" y1="16" x2="280" y2="72" gradientUnits="userSpaceOnUse">
+      <stop stop-color="#0053D0"/>
+      <stop offset="1" stop-color="#53C1FF"/>
+    </linearGradient>
+    <linearGradient id="gSrv1" x1="20" y1="220" x2="140" y2="276" gradientUnits="userSpaceOnUse">
+      <stop stop-color="#0053D0"/>
+      <stop offset="1" stop-color="#53C1FF"/>
+    </linearGradient>
+    <linearGradient id="gSrv2" x1="155" y1="220" x2="245" y2="276" gradientUnits="userSpaceOnUse">
+      <stop stop-color="#0053D0"/>
+      <stop offset="1" stop-color="#53C1FF"/>
+    </linearGradient>
+    <marker id="arrowG" viewBox="0 0 10 10" refX="9" refY="5" markerWidth="6" markerHeight="6" orient="auto-start-reverse">
+      <path d="M 0 0 L 10 5 L 0 10 z" fill="#606C71"/>
+    </marker>
+    <marker id="arrowB" viewBox="0 0 10 10" refX="9" refY="5" markerWidth="6" markerHeight="6" orient="auto-start-reverse">
+      <path d="M 0 0 L 10 5 L 0 10 z" fill="#0053D0"/>
+    </marker>
+  </defs>
+</svg>

apps/xftp-server/static/xftp-web-bundle/index.css

@@ -0,0 +1,145 @@
+#app, [data-xftp-app] {
+  font-family: system-ui, -apple-system, sans-serif;
+  color: #333;
+  width: 100%;
+  max-width: 480px;
+  padding: 16px;
+  box-sizing: border-box;
+  --xftp-ring-fg: #3b82f6;
+}
+
+:is(#app, [data-xftp-app]) .card {
+  background: #fff;
+  border-radius: 12px;
+  padding: 32px 24px;
+  box-shadow: 0 1px 3px rgba(0,0,0,.1);
+  text-align: center;
+}
+
+:is(#app, [data-xftp-app]) h1 {
+  font-size: 1.25rem;
+  font-weight: 600;
+  margin-bottom: 24px;
+}
+
+:is(#app, [data-xftp-app]) .stage { margin-top: 16px; }
+
+/* Drop zone */
+:is(#app, [data-xftp-app]) .drop-zone {
+  border: 2px dashed #ccc;
+  border-radius: 8px;
+  padding: 32px 16px;
+  transition: border-color .15s, background .15s;
+}
+:is(#app, [data-xftp-app]) .drop-zone.drag-over {
+  border-color: #3b82f6;
+  background: #eff6ff;
+}
+
+/* Buttons */
+:is(#app, [data-xftp-app]) .btn {
+  display: inline-block;
+  padding: 10px 24px;
+  border: none;
+  border-radius: 6px;
+  background: #3b82f6;
+  color: #fff;
+  font-size: .9rem;
+  font-weight: 500;
+  cursor: pointer;
+  transition: background .15s;
+}
+:is(#app, [data-xftp-app]) .btn:hover { background: #2563eb; }
+:is(#app, [data-xftp-app]) .btn-secondary { background: #6b7280; }
+:is(#app, [data-xftp-app]) .btn-secondary:hover { background: #4b5563; }
+
+/* Hints */
+:is(#app, [data-xftp-app]) .hint { color: #999; font-size: .85rem; margin-top: 8px; }
+:is(#app, [data-xftp-app]) .expiry { margin-top: 12px; }
+
+/* Progress */
+:is(#app, [data-xftp-app]) .progress-ring { display: block; margin: 0 auto 12px; }
+:is(#app, [data-xftp-app]) #upload-status,
+:is(#app, [data-xftp-app]) #dl-status { font-size: .9rem; color: #666; margin-bottom: 12px; }
+
+/* Share link row */
+:is(#app, [data-xftp-app]) .link-row {
+  display: flex;
+  gap: 8px;
+  margin-top: 12px;
+}
+:is(#app, [data-xftp-app]) .link-row input {
+  flex: 1;
+  padding: 8px 10px;
+  border: 1px solid #ccc;
+  border-radius: 6px;
+  font-size: .85rem;
+  background: #f9fafb;
+}
+
+/* Upload link */
+:is(#app, [data-xftp-app]) .upload-link {
+  margin-top: 12px;
+  color: #3b82f6;
+  font-size: .9rem;
+  text-decoration: none;
+  cursor: pointer;
+}
+:is(#app, [data-xftp-app]) .upload-link:not([hidden]) {
+  display: inline-block;
+}
+:is(#app, [data-xftp-app]) .upload-link:hover { text-decoration: underline; }
+
+/* Messages */
+:is(#app, [data-xftp-app]) .success { color: #16a34a; font-weight: 600; }
+:is(#app, [data-xftp-app]) .error { color: #dc2626; font-weight: 500; margin-bottom: 12px; }
+
+/* Security note */
+:is(#app, [data-xftp-app]) .security-note {
+  margin-top: 20px;
+  padding: 12px;
+  background: #f0fdf4;
+  border-radius: 6px;
+  font-size: .8rem;
+  color: #555;
+  text-align: left;
+}
+:is(#app, [data-xftp-app]) .security-note p + p { margin-top: 6px; }
+:is(#app, [data-xftp-app]) .security-note a { color: #3b82f6; text-decoration: none; }
+:is(#app, [data-xftp-app]) .security-note a:hover { text-decoration: underline; }
+
+/* ── Dark mode ─────────────────────────────────── */
+.dark :is(#app, [data-xftp-app]) {
+  color: #e5e7eb;
+  --xftp-ring-bg: #374151;
+  --xftp-ring-fg: #60a5fa;
+  --xftp-ring-text: #e5e7eb;
+  --xftp-ring-done: #4ade80;
+}
+.dark :is(#app, [data-xftp-app]) .card {
+  background: #1f2937;
+  box-shadow: 0 1px 3px rgba(0,0,0,.4);
+}
+.dark :is(#app, [data-xftp-app]) .drop-zone { border-color: #4b5563; }
+.dark :is(#app, [data-xftp-app]) .drop-zone.drag-over {
+  border-color: #60a5fa;
+  background: rgba(59,130,246,.15);
+}
+.dark :is(#app, [data-xftp-app]) .btn-secondary { background: #4b5563; }
+.dark :is(#app, [data-xftp-app]) .btn-secondary:hover { background: #374151; }
+.dark :is(#app, [data-xftp-app]) .hint { color: #9ca3af; }
+.dark :is(#app, [data-xftp-app]) #upload-status,
+.dark :is(#app, [data-xftp-app]) #dl-status { color: #9ca3af; }
+.dark :is(#app, [data-xftp-app]) .link-row input {
+  background: #374151;
+  border-color: #4b5563;
+  color: #e5e7eb;
+}
+.dark :is(#app, [data-xftp-app]) .success { color: #4ade80; }
+.dark :is(#app, [data-xftp-app]) .error { color: #f87171; }
+.dark :is(#app, [data-xftp-app]) .security-note {
+  background: rgba(34,197,94,.1);
+  color: #d1d5db;
+}
+.dark :is(#app, [data-xftp-app]) .upload-link { color: #60a5fa; }
+.dark :is(#app, [data-xftp-app]) .security-note a { color: #60a5fa; }

apps/xftp/Main.hs

@@ -0,0 +1,6 @@
+module Main where
+
+import Simplex.FileTransfer.Client.Main
+
+main :: IO ()
+main = xftpClientCLI

cabal.project

@@ -1,6 +1,53 @@
 packages: .
+-- packages: . ../direct-sqlcipher ../sqlcipher-simple
+-- packages: . ../hs-socks
+-- packages: . ../http2
+-- packages: . ../network-transport
+
+-- uncomment two sections below to run tests with coverage
+-- package *
+   -- coverage: True
+   -- library-coverage: True
+
+-- package attoparsec
+   -- coverage: False
+   -- library-coverage: False
+
+index-state: 2023-12-12T00:00:00Z
+
+package cryptostore
+    flags: +use_crypton
 
 source-repository-package
     type: git
     location: https://github.com/simplex-chat/aeson.git
-    tag: 3eb66f9a68f103b5f1489382aad89f5712a64db7
+    tag: aab7b5a14d6c5ea64c64dcaee418de1bb00dcc2b
+
+source-repository-package
+    type: git
+    location: https://github.com/simplex-chat/hs-socks.git
+    tag: a30cc7a79a08d8108316094f8f2f82a0c5e1ac51
+
+source-repository-package
+    type: git
+    location: https://github.com/simplex-chat/direct-sqlcipher.git
+    tag: f814ee68b16a9447fbb467ccc8f29bdd3546bfd9
+
+source-repository-package
+    type: git
+    location: https://github.com/simplex-chat/sqlcipher-simple.git
+    tag: a46bd361a19376c5211f1058908fc0ae6bf42446
+
+-- waiting for published warp-tls-3.4.7
+source-repository-package
+    type: git
+    location: https://github.com/yesodweb/wai.git
+    tag: ec5e017d896a78e787a5acea62b37a4e677dec2e
+    subdir: warp-tls
+
+-- backported fork due http-5.0
+source-repository-package
+    type: git
+    location: https://github.com/simplex-chat/wai.git
+    tag: 2f6e5aa5f05ba9140ac99e195ee647b4f7d926b0
+    subdir: warp

cbits/README.md

@@ -0,0 +1,3 @@
+# Streamlined NTRU Prime: sntrup761
+
+The implementation of sntrup761 is the _exact_ copy from this [Internet draft](https://www.ietf.org/archive/id/draft-josefsson-ntruprime-streamlined-00.html).

cbits/getentropy_win.c

@@ -0,0 +1,24 @@
+// SPDX-License-Identifier: Apache-2.0
+// getentropy() shim for Windows, where it is absent from the CRT.
+// Follows the POSIX contract: fills `buffer` with `length` random bytes
+// (length must not exceed 256), returns 0 on success or -1 with errno set.
+#ifdef _WIN32
+#include <errno.h>
+#include <stddef.h>
+#include <windows.h>
+#include <bcrypt.h>
+
+int getentropy(void *buffer, size_t length) {
+    if (length > 256) {
+        errno = EIO;
+        return -1;
+    }
+    NTSTATUS status = BCryptGenRandom(NULL, (PUCHAR)buffer, (ULONG)length,
+                                      BCRYPT_USE_SYSTEM_PREFERRED_RNG);
+    if (!BCRYPT_SUCCESS(status)) {
+        errno = EIO;
+        return -1;
+    }
+    return 0;
+}
+#endif

cbits/sha512.c

@@ -0,0 +1,9 @@
+#include <openssl/sha.h>
+#include "sha512.h"
+
+void crypto_hash_sha512 (unsigned char *out,
+                         const unsigned char *in,
+                         unsigned long long inlen)
+{
+  SHA512(in, inlen, out);
+}

cbits/sha512.h

@@ -0,0 +1,3 @@
+void crypto_hash_sha512 (unsigned char *out,
+                         const unsigned char *in,
+                         unsigned long long inlen);

cbits/sntrup761.h

@@ -0,0 +1,33 @@
+/*
+ * Derived from public domain source, written by (in alphabetical order):
+ * - Daniel J. Bernstein
+ * - Chitchanok Chuengsatiansup
+ * - Tanja Lange
+ * - Christine van Vredendaal
+ */
+
+#ifndef SNTRUP761_H
+#define SNTRUP761_H
+
+#include <string.h>
+#include <stdint.h>
+
+#define SNTRUP761_SECRETKEY_SIZE 1763
+#define SNTRUP761_PUBLICKEY_SIZE 1158
+#define SNTRUP761_CIPHERTEXT_SIZE 1039
+#define SNTRUP761_SIZE 32
+
+typedef void sntrup761_random_func (void *ctx, size_t length, uint8_t *dst);
+
+void
+sntrup761_keypair (uint8_t *pk, uint8_t *sk,
+                   void *random_ctx, sntrup761_random_func *random);
+
+void
+sntrup761_enc (uint8_t *c, uint8_t *k, const uint8_t *pk,
+               void *random_ctx, sntrup761_random_func *random);
+
+void
+sntrup761_dec (uint8_t *k, const uint8_t *c, const uint8_t *sk);
+
+#endif /* SNTRUP761_H */

contributing/CODE.md

@@ -0,0 +1,104 @@
+# Coding and building
+
+This file provides guidance on coding style and approaches and on building the code.
+
+## Code Security
+
+When designing code and planning implementations:
+- Apply adversarial thinking, and consider what may happen if one of the communicating parties is malicious.
+- Formulate an explicit threat model for each change - who can do which undesirable things and under which circumstances.
+
+## Code Quality Standards
+
+Haskell client and server code serves as system specification, not just implementation — we use type-driven design to reflect the business domain in types. Quality, conciseness, and clarity of Haskell code are critical.
+
+## Code Style, Formatting and Approaches
+
+The project uses **fourmolu** for Haskell code formatting. Configuration is in `fourmolu.yaml`.
+
+**Key formatting rules:**
+- 2-space indentation
+- Trailing function arrows, commas, and import/export style
+- Record brace without space: `{field = value}`
+- Single newline between declarations
+- Never use unicode symbols
+- Inline `let` style with right-aligned `in`
+
+**Format code before committing:**
+
+```bash
+# Format a single file
+fourmolu -i src/Simplex/Messaging/Protocol.hs
+```
+
+Some files that use CPP language extension cannot be formatted as a whole, so individual code fragments need to be formatted.
+
+**Follow existing code patterns:**
+- Match the style of surrounding code
+- Use qualified imports with short aliases (e.g., `import qualified Data.ByteString.Char8 as B`)
+- Use record syntax for types with multiple fields
+- Prefer explicit pattern matching over partial functions
+
+**Comments policy:**
+- Avoid redundant comments that restate what the code already says
+- Only comment on non-obvious design decisions or tricky implementation details
+- Function names and type signatures should be self-documenting
+- Do not add comments like "wire format encoding" (Encoding class is always wire format) or "check if X" when the function name already says that
+- Assume a competent Haskell reader
+
+**Diff and refactoring:**
+- Avoid unnecessary changes and code movements
+- Never do refactoring unless it substantially reduces cost of solving the current problem, including the cost of refactoring
+- Aim to minimize the code changes - do what is minimally required to solve users' problems
+
+**Document and code structure:**
+- **Never move existing code or sections around** - add new content at appropriate locations without reorganizing existing structure.
+- When adding new sections to documents, continue the existing numbering scheme.
+- Minimize diff size - prefer small, targeted changes over reorganization.
+
+**Code analysis and review:**
+- Trace data flows end-to-end: from origin, through storage/parameters, to consumption. Flag values that are discarded and reconstructed from partial data (e.g. extracted from a URI missing original fields) — this is usually a bug.
+- Read implementations of called functions, not just signatures — if duplication involves a called function, check whether decomposing it resolves the duplication.
+- Do not save time on analysis. Read every function in the data flow even when the interface seems clear — wrong assumptions about internals are the main source of missed bugs.
+
+### Haskell Extensions
+- `StrictData` enabled by default
+- Use STM for safe concurrency
+- Assume concurrency in PostgreSQL queries
+- Comprehensive warning flags with strict pattern matching
+
+## Build Commands
+
+```bash
+# Standard build
+cabal build
+
+# Fast build
+cabal build --ghc-options -O0
+
+# Build specific executables
+cabal build exe:smp-server exe:xftp-server exe:ntf-server exe:xftp
+
+# Build with PostgreSQL server support
+cabal build -fserver_postgres
+
+# Client-only library build (no server code)
+cabal build -fclient_library
+
+# Find binary location
+cabal list-bin exe:smp-server
+```
+
+### Cabal Flags
+
+- `swift`: Enable Swift JSON format
+- `client_library`: Build without server code
+- `client_postgres`: Use PostgreSQL instead of SQLite for agent persistence
+- `server_postgres`: PostgreSQL support for server queue/notification store
+
+## External Dependencies
+
+Custom forks specified in `cabal.project`:
+- `aeson`, `hs-socks` (SimpleX forks)
+- `direct-sqlcipher`, `sqlcipher-simple` (encrypted SQLite)
+- `warp`, `warp-tls` (HTTP server)

contributing/PROJECT.md

@@ -0,0 +1,105 @@
+# SimpleXMQ repository
+
+This file provides guidance on the project structure to help working with code in this repository.
+
+## Project Overview
+
+SimpleXMQ is a Haskell message broker implementing unidirectional (simplex) queues for privacy-preserving messaging. 
+
+Key components:
+
+- **SimpleX Messaging Protocol**: SMP protocol definition and encodings ([code](../src/Simplex/Messaging/Protocol.hs), [transport code](../src/Simplex/Messaging/Transport.hs), [spec](../protocol/simplex-messaging.md)).
+- **SMP Server**: Message broker with TLS, in-memory queues, optional persistence ([main code](../src/Simplex/Messaging/Server.hs), [all code files](../src/Simplex/Messaging/Server/), [executable](../apps/smp-server/)). For proxying SMP commands the server uses [lightweight SMP client](../src/Simplex/Messaging/Client/Agent.hs).
+- **SMP Client**: Functional API with STM-based message delivery ([code](../src/Simplex/Messaging/Client.hs)).
+- **SMP Agent**: High-level duplex connections via multiple simplex queues with E2E encryption ([code](../src/Simplex/Messaging/Agent.hs)). Implements Agent-to-agent protocol ([code](../src/Simplex/Messaging/Agent/Protocol.hs), [spec](../protocol/agent-protocol.md)) via intermediary agent client ([code](../src/Simplex/Messaging/Agent/Client.hs)).
+- **XFTP**: SimpleX File Transfer Protocol, server and CLI client ([code](../src/Simplex/FileTransfer/), [spec](../protocol/xftp.md)).
+- **XRCP**: SimpleX Remote Control Protocol ([code](`../src/Simplex/RemoteControl/`), [spec](../protocol/xrcp.md)).
+- **Notifications**: Push notifications server requires PostgreSQL ([code](../src/Simplex/Messaging/Notifications), [executable](../apps/ntf-server/)). Client protocol is used for clients to communicate with the server ([code](../src/Simplex/Messaging/Notifications/Protocol.hs), [spec](../protocol/push-notifications.md)). For subscribing to SMP notifications the server uses [lightweight SMP client](../src/Simplex/Messaging/Client/Agent.hs).
+
+## Architecture
+
+For general overview see `../protocol/overview-tjr.md`.
+
+SMP Protocol Layers:
+
+```
+TLS Transport → SMP Protocol → Agent Protocol → Application protocol
+```
+
+XFTP Protocol Layers:
+
+```
+TLS Transport (HTTP2 encoding) → XFTP Protocol → Out-of-band file descriptions
+```
+
+## Key Patterns
+
+1. **Persistence**: All queue state managed via Software Transactional Memory or via PostgreSQL
+   - `Simplex.Messaging.Server.MsgStore.STM` - in-memory messages
+   - `Simplex.Messaging.Server.QueueStore.STM` - in-memory queue state
+   - `Simplex.Messaging.Server.MsgStore.Postgres` - message storage
+   - `Simplex.Messaging.Server.QueueStore.Postgres` - queue storage
+
+2. **Append-Only Store Log**: Optional persistence via journal for in-memory storage
+   - `Simplex.Messaging.Server.StoreLog` - queue creation log
+   - Compacted on restart
+
+3. **Agent Storage**:
+   - SQLite (default) or PostgreSQL
+   - Migrations in `src/Simplex/Messaging/Agent/Store/{SQLite,Postgres}/Migrations/`
+
+4. **Protocol Versioning**: All layers support version negotiation
+   - `Simplex.Messaging.Version` - version range utilities
+
+5. **Double Ratchet E2E**: Per-connection encryption
+   - `Simplex.Messaging.Crypto.Ratchet`
+   - SNTRUP761 post-quantum KEM (`src/Simplex/Messaging/Crypto/SNTRUP761/`)
+
+## Source Layout
+
+```
+src/Simplex/
+├── Messaging/
+│   ├── Agent.hs          # Main agent (~210KB)
+│   ├── Server.hs         # SMP server (~130KB)
+│   ├── Client.hs         # Client API (~65KB)
+│   ├── Protocol.hs       # Protocol types (~77KB)
+│   ├── Crypto.hs         # E2E encryption (~52KB)
+│   ├── Transport.hs      # Transport encoding over TLS
+│   ├── Agent/Store/      # SQLite/Postgres persistence
+│   ├── Server/           # Server internals (QueueStore, MsgStore, Control)
+│   └── Notifications/    # Push notification system
+├── FileTransfer/         # XFTP implementation for file transfers
+└── RemoteControl/        # XRCP implementation for device discovery & control
+```
+
+## Protocol Documentation
+
+- `protocol/overview-tjr.md`: SMP protocols stack overview
+- `protocol/simplex-messaging.md`: SMP protocol spec (v19)
+- `protocol/agent-protocol.md`: Agent protocol spec (v7)
+- `protocol/xftp.md`: File transfer protocol
+- `protocol/xrcp.md`: Remote control protocol
+- `rfcs/`: Design RFCs for features
+
+## Testing
+
+```bash
+# Run all tests
+cabal test --test-show-details=streaming
+
+# Run specific test group (uses HSpec)
+cabal test --test-option=--match="/Core tests/Encryption tests/"
+
+# Run single test
+cabal test --test-option=--match="/SMP client agent/functional API/"
+```
+
+Tests require PostgreSQL running on `localhost:5432` when using `-fserver_postgres` or `-fclient_postgres`.
+
+Test files are in `tests/` with structure:
+- `Test.hs`: Main runner
+- `AgentTests/`: Agent protocol and connection tests
+- `CoreTests/`: Crypto, encoding, storage tests
+- `ServerTests.hs`: SMP server tests
+- `XFTPServerTests.hs`: File transfer tests

contributing/README.md

@@ -0,0 +1,23 @@
+# Contributing to SimpleX repositories
+
+## Focus on user problems
+
+We do not make code changes to improve code - any change must address a specific user problem or request.
+
+## Discuss the plans as early as possible
+
+Please discuss the problem you want to solve and your detailed implementation plan with the project team prior to contributing, to avoid wasted time and additional changes. Acceptance of your contribution depends on your willingness and ability to iterate the proposed contribution to achieve the required quality level, coding style, test coverage, and alignment with user requirements as they are understood by the project team.
+
+## Follow project structure, coding style and approaches
+
+./PROJECT.md has information about the structure of this `simplexmq` repository.
+
+./CODE.md has details about general requirements common for `simplexmq` and `simplex-chat` repositories.
+
+This files can be used with LLM prompts, e.g. if you use Claude Code you can create CLAUDE.md file in project root importing content from these files:
+
+```markdown
+@README.md
+@contributing/PROJECT.md
+@contributing/CODE.md
+```

fourmolu.yaml

@@ -0,0 +1,30 @@
+indentation: 2
+column-limit: none
+function-arrows: trailing
+comma-style: trailing
+import-export-style: trailing
+indent-wheres: true
+record-brace-space: true
+newlines-between-decls: 1
+haddock-style: single-line
+haddock-style-module: null
+let-style: inline
+in-style: right-align
+single-constraint-parens: never
+unicode: never
+respectful: true
+fixities:
+  - infixr 9 .
+  - infixr 8 .:, .:., .=
+  - infixr 6 <>
+  - infixr 5 ++
+  - infixl 4 <$>, <$, $>,  <$$>, <$?>
+  - infixl 4 <*>, <*, *>, <**>
+  - infix 4 ==, /=
+  - infixr 3 &&
+  - infixl 3 <|>
+  - infixr 2 ||
+  - infixl 1 >>, >>=
+  - infixr 1 =<<, >=>, <=<
+  - infixr 0 $, $!
+reexports: []

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install.sh

@@ -0,0 +1,228 @@
+#!/usr/bin/env sh
+set -eu
+
+# Links to scripts/configs
+scripts="https://raw.githubusercontent.com/simplex-chat/simplexmq/stable/scripts/main"
+scripts_systemd_smp="$scripts/smp-server.service"
+scripts_systemd_xftp="$scripts/xftp-server.service"
+scripts_update="$scripts/simplex-servers-update"
+scripts_uninstall="$scripts/simplex-servers-uninstall"
+scripts_stopscript="$scripts/simplex-servers-stopscript"
+
+# Default installation paths
+path_bin="/usr/local/bin"
+path_bin_smp="$path_bin/smp-server"
+path_bin_xftp="$path_bin/xftp-server"
+path_bin_update="$path_bin/simplex-servers-update"
+path_bin_uninstall="$path_bin/simplex-servers-uninstall"
+path_bin_stopscript="$path_bin/simplex-servers-stopscript"
+
+path_conf_etc="/etc/opt"
+path_conf_var="/var/opt"
+path_conf_smp="$path_conf_etc/simplex $path_conf_var/simplex"
+path_conf_xftp="$path_conf_etc/simplex-xftp $path_conf_var/simplex-xftp /srv/xftp"
+
+path_conf_info="$path_conf_etc/simplex-info"
+
+path_systemd="/etc/systemd/system"
+path_systemd_smp="$path_systemd/smp-server.service"
+path_systemd_xftp="$path_systemd/xftp-server.service"
+
+# Defaut users
+user_smp="smp"
+user_xftp="xftp"
+
+GRN='\033[0;32m'
+BLU='\033[1;34m'
+YLW='\033[1;33m'
+RED='\033[0;31m'
+NC='\033[0m'
+
+logo='
+ ____  _                 _     __  __
+/ ___|(_)_ __ ___  _ __ | | ___\ \/ /
+\___ \| | '"'"'_ ` _ \| '"'"'_ \| |/ _ \\  / 
+ ___) | | | | | | | |_) | |  __//  \ 
+|____/|_|_| |_| |_| .__/|_|\___/_/\_\
+                  |_|                            
+'
+
+welcome="Welcome to SMP/XFTP installation script! Here's what we're going to do:
+${GRN}1.${NC} Install latest binaries from GitHub releases:
+    - smp: ${YLW}${path_bin_smp}${NC}
+    - xftp: ${YLW}${path_bin_xftp}${NC}
+${GRN}2.${NC} Create server directories:
+    - smp: ${YLW}${path_conf_smp}${NC}
+    - xftp: ${YLW}${path_conf_xftp}${NC}
+${GRN}3.${NC} Setup user for server:
+    - xmp: ${YLW}${user_smp}${NC}
+    - xftp: ${YLW}${user_xftp}${NC}
+${GRN}4.${NC} Create systemd services:
+    - smp: ${YLW}${path_systemd_smp}${NC}
+    - xftp: ${YLW}${path_systemd_xftp}${NC}
+${GRN}5.${NC} Install stopscript (systemd), update and uninstallation script:
+    - all: ${YLW}${path_bin_update}${NC}, ${YLW}${path_bin_uninstall}${NC}, ${YLW}${path_bin_stopscript}${NC}
+
+Press:
+  - ${GRN}1${NC} to install smp server
+  - ${GRN}2${NC} to install xftp server
+  - ${RED}Ctrl+C${NC} to cancel installation
+  
+Selection: "
+
+end="Installtion is complete!
+
+Please checkout our server guides:
+- smp: ${GRN}https://simplex.chat/docs/server.html${NC}
+- xftp: ${GRN}https://simplex.chat/docs/xftp-server.html${NC}
+
+To uninstall with full clean-up, simply run: ${YLW}sudo /usr/local/bin/simplex-servers-uninstall${NC}
+"
+
+set_version() {
+  ver="${VER:-latest}"
+
+  case "$ver" in 
+    latest)
+      bin="https://github.com/simplex-chat/simplexmq/releases/latest/download"
+      remote_version="$(curl --proto '=https' --tlsv1.2 -sSf -L https://api.github.com/repos/simplex-chat/simplexmq/releases/latest | grep -i "tag_name" | awk -F \" '{print $4}')"
+      ;;
+    *)
+      bin="https://github.com/simplex-chat/simplexmq/releases/download/${ver}"
+      remote_version="${ver}"
+      ;;
+  esac
+}
+
+os_test() {
+ . /etc/os-release
+
+ case "$VERSION_ID" in
+  20.04|22.04) : ;;
+  24.04) VERSION_ID='22.04' ;;
+  *) printf "${RED}Unsupported Ubuntu version!${NC}\nPlease file Github issue with request to support Ubuntu %s: https://github.com/simplex-chat/simplexmq/issues/new\n" "$VERSION_ID" && exit 1 ;;
+ esac
+
+ version="$(printf '%s' "$VERSION_ID" | tr '.' '_')"
+ arch="$(uname -p)"
+
+ case "$arch" in
+  x86_64) arch="$(printf '%s' "$arch" | tr '_' '-')" ;;
+  *)  printf "${RED}Unsupported architecture!${NC}\nPlease file Github issue with request to support %s architecture: https://github.com/simplex-chat/simplexmq/issues/new" "$arch" && exit 1 ;;
+ esac
+
+ bin_smp="$bin/smp-server-ubuntu-${version}-${arch}"
+ bin_xftp="$bin/xftp-server-ubuntu-${version}-${arch}"
+}
+
+setup_bins() {
+ eval "bin=\$bin_${1}"
+ eval "path=\$path_bin_${1}"
+
+ curl --proto '=https' --tlsv1.2 -sSf -L "$bin" -o "$path" && chmod +x "$path"
+
+ unset bin path
+}
+
+setup_users() {
+ eval "user=\$user_${1}"
+
+ useradd -M "$user" 2> /dev/null || true
+
+ unset user
+}
+
+setup_dirs() {
+ # Unquoted varibles, so field splitting can occur
+ eval "path_conf=\$path_conf_${1}"
+ eval "user=\$user_${1}"
+
+ mkdir -p $path_conf
+ mkdir -p $path_conf_info
+ printf "local_version_%s='%s'\n" "$1" "$remote_version" >> "$path_conf_info/release"
+ chown -R "$user":"$user" $path_conf
+
+ unset path_conf user
+}
+
+setup_systemd() {
+ eval "scripts_systemd=\$scripts_systemd_${1}"
+ eval "path_systemd=\$path_systemd_${1}"
+
+ curl --proto '=https' --tlsv1.2 -sSf -L "$scripts_systemd" -o "$path_systemd"
+
+ unset scripts_systemd path_systemd
+}
+
+setup_scripts() {
+ curl --proto '=https' --tlsv1.2 -sSf -L "$scripts_update" -o "$path_bin_update" && chmod +x "$path_bin_update"
+ curl --proto '=https' --tlsv1.2 -sSf -L "$scripts_uninstall" -o "$path_bin_uninstall" && chmod +x "$path_bin_uninstall"
+ curl --proto '=https' --tlsv1.2 -sSf -L "$scripts_stopscript" -o "$path_bin_stopscript" && chmod +x "$path_bin_stopscript"
+ }
+
+checks() {
+ if [ "$(id -u)" -ne 0 ]; then
+  printf "This script is intended to be run with root privileges. Please re-run script using sudo."
+  exit 1
+ fi
+ 
+ set_version
+ os_test
+
+ mkdir -p $path_conf_info  
+}
+
+main() {
+ checks
+ 
+ printf "%b\n%b" "${BLU}$logo${NC}" "$welcome"
+ read ans
+
+ case "$ans" in
+  1) setup='smp' ;;
+  2) setup='xftp' ;;
+  *) printf 'Installation aborted.\n' && exit 0 ;;
+ esac
+
+ printf "Installing binaries..."
+ 
+ for i in $setup; do
+  setup_bins "$i"
+ done
+ 
+ printf "${GRN} Done!${NC}\n"
+
+ printf "Creating users..."
+
+ for i in $setup; do
+  setup_users "$i"
+ done
+
+ printf "${GRN} Done!${NC}\n"
+ 
+ printf "Creating directories..."
+
+ for i in $setup; do
+  setup_dirs "$i"
+ done
+
+ printf "${GRN} Done!${NC}\n"
+
+ printf "Creating systemd services..."
+
+ for i in $setup; do
+  setup_systemd "$i"
+ done
+
+ printf "${GRN} Done!${NC}\n"
+
+ printf "Installing stopscript, update and uninstallation script..."
+
+ setup_scripts
+
+ printf "${GRN} Done!${NC}\n"
+
+ printf "%b" "$end"
+}
+
+main

package.yaml

@@ -1,133 +0,0 @@
-name: simplexmq
-version: 3.1.0
-synopsis: SimpleXMQ message broker
-description: |
-  This package includes <./docs/Simplex-Messaging-Server.html server>,
-  <./docs/Simplex-Messaging-Client.html client> and
-  <./docs/Simplex-Messaging-Agent.html agent> for SMP protocols:
-  .
-  * <https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md SMP protocol>
-  * <https://github.com/simplex-chat/simplexmq/blob/master/protocol/agent-protocol.md SMP agent protocol>
-  .
-  See <https://github.com/simplex-chat/simplex-chat terminal chat prototype> built with SimpleXMQ broker.
-
-homepage: https://github.com/simplex-chat/simplexmq#readme
-license: AGPL-3
-author: simplex.chat
-maintainer: chat@simplex.chat
-copyright: 2020-2022 simplex.chat
-category: Chat, Network, Web, System, Cryptography
-extra-source-files:
-  - README.md
-  - CHANGELOG.md
-
-dependencies:
-  - aeson == 2.0.*
-  - ansi-terminal >= 0.10 && < 0.12
-  - asn1-encoding == 0.9.*
-  - asn1-types == 0.3.*
-  - async == 2.2.*
-  - attoparsec == 0.14.*
-  - base >= 4.14 && < 5
-  - base64-bytestring >= 1.0 && < 1.3
-  - bytestring == 0.10.*
-  - case-insensitive == 1.2.*
-  - composition == 1.0.*
-  - constraints >= 0.12 && < 0.14
-  - containers == 0.6.*
-  - cryptonite >= 0.27 && < 0.30
-  - cryptostore == 0.2.*
-  - data-default == 0.7.*
-  - direct-sqlite == 2.3.*
-  - directory == 1.3.*
-  - filepath == 1.4.*
-  - http-types == 0.12.*
-  - http2 == 3.0.*
-  - generic-random >= 1.3 && < 1.5
-  - ini == 0.4.*
-  - iso8601-time == 0.1.*
-  - memory == 0.15.*
-  - mtl == 2.2.*
-  - network >= 3.1.2.7 && < 3.2
-  - network-transport == 0.5.*
-  - optparse-applicative >= 0.15 && < 0.17
-  - QuickCheck == 2.14.*
-  - process == 1.6.*
-  - random >= 1.1 && < 1.3
-  - simple-logger == 0.1.*
-  - sqlite-simple == 0.4.*
-  - stm == 2.5.*
-  - template-haskell == 2.16.*
-  - text == 1.2.*
-  - time == 1.9.*
-  - time-compat == 1.9.*
-  - time-manager == 0.0.*
-  - tls >= 1.6.0 && < 1.7
-  - transformers == 0.5.*
-  - unliftio == 0.2.*
-  - unliftio-core == 0.2.*
-  - websockets == 0.12.*
-  - x509 == 1.7.*
-  - x509-store == 1.6.*
-  - x509-validation == 1.6.*
-
-flags:
-  swift:
-    description: Enable swift JSON format
-    manual: True
-    default: False
-
-when:
-  - condition: flag(swift)
-    cpp-options:
-      - -DswiftJSON
-
-library:
-  source-dirs: src
-
-executables:
-  smp-server:
-    source-dirs: apps/smp-server
-    main: Main.hs
-    dependencies:
-      - simplexmq
-    ghc-options:
-      - -threaded
-
-  ntf-server:
-    source-dirs: apps/ntf-server
-    main: Main.hs
-    dependencies:
-      - simplexmq
-    ghc-options:
-      - -threaded
-
-  smp-agent:
-    source-dirs: apps/smp-agent
-    main: Main.hs
-    dependencies:
-      - simplexmq
-    ghc-options:
-      - -threaded
-
-tests:
-  smp-server-test:
-    source-dirs: tests
-    main: Test.hs
-    dependencies:
-      - simplexmq
-      - hspec == 2.7.*
-      - hspec-core == 2.7.*
-      - HUnit == 1.6.*
-      - QuickCheck == 2.14.*
-      - timeit == 2.0.*
-
-ghc-options:
-  # - -haddock
-  - -Wall
-  - -Wcompat
-  - -Werror=incomplete-patterns
-  - -Wredundant-constraints
-  - -Wincomplete-record-updates
-  - -Wincomplete-uni-patterns
-  - -Wunused-type-patterns

plans/2026-03-25-xftp-postgres-backend-design.md

@@ -0,0 +1,472 @@
+# XFTP Server PostgreSQL Backend
+
+## Overview
+
+Add PostgreSQL backend support to xftp-server, following the SMP server pattern. Supports bidirectional migration between STM (in-memory with StoreLog) and PostgreSQL backends.
+
+## Goals
+
+- PostgreSQL-backed file metadata storage as an alternative to STM + StoreLog
+- Polymorphic server code via `FileStoreClass` typeclass with IO-based methods (following `QueueStoreClass` pattern)
+- Bidirectional migration: StoreLog <-> PostgreSQL via CLI commands
+- Shared `server_postgres` cabal flag (same flag enables both SMP and XFTP Postgres support)
+- INI-based backend selection at runtime
+
+## Architecture
+
+### FileStoreClass Typeclass
+
+IO-based typeclass following the `QueueStoreClass` pattern — each method is a self-contained IO action, with the implementation responsible for its own atomicity (STM backend wraps in `atomically`, Postgres backend uses database transactions):
+
+```haskell
+class FileStoreClass s where
+  type FileStoreConfig s
+
+  -- Lifecycle
+  newFileStore :: FileStoreConfig s -> IO s
+  closeFileStore :: s -> IO ()
+
+  -- File operations
+  addFile :: s -> SenderId -> FileInfo -> RoundedFileTime -> ServerEntityStatus -> IO (Either XFTPErrorType ())
+  setFilePath :: s -> SenderId -> FilePath -> IO (Either XFTPErrorType ())
+  addRecipient :: s -> SenderId -> FileRecipient -> IO (Either XFTPErrorType ())
+  getFile :: s -> SFileParty p -> XFTPFileId -> IO (Either XFTPErrorType (FileRec, C.APublicAuthKey))
+  deleteFile :: s -> SenderId -> IO (Either XFTPErrorType ())
+  blockFile :: s -> SenderId -> BlockingInfo -> Bool -> IO (Either XFTPErrorType ())
+  deleteRecipient :: s -> RecipientId -> FileRec -> IO ()
+  ackFile :: s -> RecipientId -> IO (Either XFTPErrorType ())
+
+  -- Expiration (with LIMIT for Postgres; called in a loop until empty)
+  expiredFiles :: s -> Int64 -> Int -> IO [(SenderId, Maybe FilePath, Word32)]
+
+  -- Storage and stats (for init-time computation)
+  getUsedStorage :: s -> IO Int64
+  getFileCount :: s -> IO Int
+```
+
+- STM backend: each method wraps its STM transaction in `atomically` internally.
+- Postgres backend: each method runs its query via `withDB` / database connection internally.
+
+No polymorphic monad or `runStore` dispatcher needed — unlike `MsgStoreClass`, XFTP file operations are individually atomic and don't require grouping multiple operations into backend-dependent transactions.
+
+### PostgresFileStore Data Type
+
+```haskell
+data PostgresFileStore = PostgresFileStore
+  { dbStore :: DBStore,
+    dbStoreLog :: Maybe (StoreLog 'WriteMode)
+  }
+```
+
+- `dbStore` — connection pool created via `createDBStore`, runs schema migrations on init.
+- `dbStoreLog` — optional parallel log file (enabled by `db_store_log` INI setting). When present, every mutation (`addFile`, `setFilePath`, `deleteFile`, `blockFile`, `addRecipient`, `ackFile`) also writes to this log via a `withLog` wrapper. `withLog` is called AFTER the DB operation succeeds (so the log reflects committed state only). Log write failures are non-fatal (logged as warnings, do not fail the DB operation). This provides an audit trail and enables recovery via export.
+
+`closeFileStore` for Postgres calls `closeDBStore` (closes connection pool) then `mapM_ closeStoreLog dbStoreLog` (flushes and closes the parallel log). For STM, it closes the storeLog. Called from a `finally` block during server shutdown, matching SMP's `stopServer` → `closeMsgStore` → `closeQueueStore` pattern.
+
+### STMFileStore Type
+
+After extracting from current `Store.hs`, `STMFileStore` retains the file and recipient maps but no longer owns `usedStorage` (moved to `XFTPEnv`):
+
+```haskell
+data STMFileStore = STMFileStore
+  { files :: TMap SenderId FileRec,
+    recipients :: TMap RecipientId (SenderId, RcvPublicAuthKey)
+  }
+```
+
+`closeFileStore` for STM is a no-op (TMaps are garbage-collected; the env-level `storeLog` is closed separately by the server).
+
+### Error Handling
+
+Postgres operations follow SMP's `withDB` / `handleDuplicate` pattern:
+
+```haskell
+withDB :: Text -> PostgresFileStore -> (DB.Connection -> IO (Either XFTPErrorType a)) -> ExceptT XFTPErrorType IO a
+withDB op st action =
+  ExceptT $ E.try (withTransaction (dbStore st) action) >>= either logErr pure
+  where
+    logErr :: E.SomeException -> IO (Either XFTPErrorType a)
+    logErr e = logError ("STORE: " <> err) $> Left INTERNAL
+      where
+        err = op <> ", withDB, " <> tshow e
+
+handleDuplicate :: SqlError -> IO (Either XFTPErrorType a)
+handleDuplicate e = case constraintViolation e of
+  Just (UniqueViolation _) -> pure $ Left DUPLICATE_
+  _ -> E.throwIO e
+```
+
+- All DB operations wrapped in `withDB` — catches exceptions, logs, returns `INTERNAL`.
+- Unique constraint violations caught by `handleDuplicate` and mapped to `DUPLICATE_`.
+- UPDATE operations verified with `assertUpdated` — returns `AUTH` if 0 rows affected (matching SMP pattern, prevents silent failures when WHERE clause doesn't match).
+- Critical sections (DB write + TVar update) wrapped in `uninterruptibleMask_` to prevent async exceptions from leaving inconsistent state between DB and TVars.
+
+### FileRec and TVar Fields
+
+`FileRec` retains its `TVar` fields (matching SMP's `PostgresQueue` pattern):
+
+```haskell
+data FileRec = FileRec
+  { senderId :: SenderId,
+    fileInfo :: FileInfo,
+    filePath :: TVar (Maybe FilePath),
+    recipientIds :: TVar (Set RecipientId),
+    createdAt :: RoundedFileTime,
+    fileStatus :: TVar ServerEntityStatus
+  }
+```
+
+- **STM backend**: TVars are the source of truth, as currently.
+- **Postgres backend**: `getFile` reads from DB and creates a `FileRec` with fresh TVars populated from the DB row (matching SMP's `mkQ` pattern — `newTVarIO` per load). Mutation methods (`setFilePath`, `blockFile`, etc.) update both the DB (persistence) and the TVars (in-session consistency). The `recipientIds` TVar is initialized to `S.empty` — no subquery needed because no server code reads `recipientIds` directly; all recipient operations go through the typeclass methods (`addRecipient`, `deleteRecipient`, `ackFile`), which query the `recipients` table for Postgres.
+
+### usedStorage Ownership
+
+`usedStorage :: TVar Int64` moves from the store to `XFTPEnv`. The store typeclass does **not** manage `usedStorage` — it only provides `getUsedStorage` for init-time computation.
+
+- **STM init**: StoreLog replay calls `setFilePath` (which only sets the filePath TVar — the STM `setFilePath` implementation is changed to **not** update `usedStorage`). Similarly, STM `deleteFile` (Store.hs line 117) and `blockFile` (line 125) are changed to **not** update `usedStorage` — the server handles all `usedStorage` adjustments externally. After replay, `getUsedStorage` computes the sum over all file sizes (matching current `countUsedStorage` behavior).
+- **Postgres init**: `getUsedStorage` executes `SELECT COALESCE(SUM(file_size), 0) FROM files`.
+- **Runtime**: Server manages `usedStorage` TVar directly for reserve/commit/rollback during uploads, and adjusts after `deleteFile`/`blockFile` calls.
+
+**Note on `getUsedStorage` semantics**: The current STM `countUsedStorage` sums all file sizes unconditionally (including files without `filePath` set, i.e., created but not yet uploaded). The Postgres `getUsedStorage` matches this: `SELECT SUM(file_size) FROM files` (no `WHERE file_path IS NOT NULL`). In practice, orphaned files (created but never uploaded) are rare and short-lived (expired within 48h), so the difference is negligible. A future improvement could filter by `file_path IS NOT NULL` in both backends to reflect actual disk usage more accurately.
+
+### Server.hs Refactoring
+
+`Server.hs` becomes polymorphic over `FileStoreClass s`. Since all typeclass methods are IO, call sites replace `atomically` with direct IO calls to the store.
+
+**Call sites requiring changes** (exhaustive list):
+
+1. **`receiveServerFile`** (line 563): `atomically $ writeTVar filePath (Just fPath)` → `setFilePath store senderId fPath`. The `reserve` logic (line 551-555) stays as direct TVar manipulation on `usedStorage` from `XFTPEnv`.
+
+2. **`verifyXFTPTransmission`** (line 453): `atomically $ verify =<< getFile st party fId` — the `getFile` call and subsequent `readTVar fileStatus` are in a single `atomically` block. Refactored to: `getFile st party fId` (IO), then `readTVarIO (fileStatus fr)` from the returned `FileRec` (safe for both backends — STM TVar is the source of truth, Postgres TVar is a fresh snapshot from DB).
+
+3. **`retryAdd`** (line 516): Signature `XFTPFileId -> STM (Either XFTPErrorType a)` → `XFTPFileId -> IO (Either XFTPErrorType a)`. The `atomically` call (line 520) replaced with `liftIO`.
+
+4. **`deleteOrBlockServerFile_`** (line 620): Parameter `FileStore -> STM (Either XFTPErrorType ())` → `FileStoreClass s => s -> IO (Either XFTPErrorType ())`. The `atomically` call (line 626) removed — the store method is already IO. After the store action, server adjusts `usedStorage` TVar in `XFTPEnv` based on `fileInfo.size`.
+
+5. **`ackFileReception`** (line 605): `atomically $ deleteRecipient st rId fr` → `deleteRecipient st rId fr`.
+
+6. **Control port `CPDelete`/`CPBlock`** (lines 371, 377): `atomically $ getFile fs SFRecipient fileId` → `getFile fs SFRecipient fileId`.
+
+7. **`expireServerFiles`** (line 636): Replace per-file `expiredFilePath` iteration with batched `expiredFiles st old batchSize`, which returns `[(SenderId, Maybe FilePath, Word32)]` — the `Word32` file size is needed so the server can adjust the `usedStorage` TVar after each deletion. Called in a loop until the returned list is empty. The `itemDelay` between files applies to the deletion loop over each batch, not the query itself. STM backend ignores the batch size limit (returns all expired files from TMap scan); Postgres uses `LIMIT`.
+
+8. **`restoreServerStats`** (line 694): `FileStore {files, usedStorage} <- asks store` accesses store fields directly. Refactored to: `usedStorage` from `XFTPEnv` via `asks usedStorage`, file count via `getFileCount store`. STM: `M.size <$> readTVarIO files`. Postgres: `SELECT COUNT(*) FROM files`.
+
+### Store Config Selection
+
+GADT in `Env.hs`:
+
+```haskell
+data XFTPStoreConfig s where
+  XSCMemory :: Maybe FilePath -> XFTPStoreConfig STMFileStore
+#if defined(dbServerPostgres)
+  XSCDatabase :: PostgresFileStoreCfg -> XFTPStoreConfig PostgresFileStore
+#endif
+```
+
+`XFTPEnv` becomes polymorphic:
+
+```haskell
+data XFTPEnv s = XFTPEnv
+  { config :: XFTPServerConfig,
+    store :: s,
+    usedStorage :: TVar Int64,
+    storeLog :: Maybe (StoreLog 'WriteMode),
+    ...
+  }
+```
+
+The `M` monad (`ReaderT (XFTPEnv s) IO`) and all functions in `Server.hs` gain `FileStoreClass s =>` constraints.
+
+**StoreLog lifecycle per backend:**
+
+- **STM mode**: `storeLog = Just sl` (current behavior — append-only log for persistence and recovery).
+- **Postgres mode**: `storeLog = Nothing` (main storeLog disabled — Postgres is the source of truth). The optional parallel `dbStoreLog` inside `PostgresFileStore` provides audit/recovery if enabled via `db_store_log` INI setting.
+
+The existing `withFileLog` pattern in Server.hs continues to work unchanged — it maps over `Maybe (StoreLog 'WriteMode)`, which is `Nothing` in Postgres mode so the calls become no-ops.
+
+### Main.hs Store Type Dispatch
+
+The `Start` CLI command gains a `--confirm-migrations` flag (default `MCConsole` — manual prompt, matching SMP's `StartOptions`). For automated deployments, `--confirm-migrations up` auto-applies forward migrations. The import command uses `MCYesUp` (always auto-apply).
+
+Following SMP's existential dispatch pattern (`AStoreType` + `run`), `Main.hs` selects the store type from INI config and dispatches to the polymorphic server:
+
+```haskell
+runServer ini = do
+  let storeType = fromRight "memory" $ lookupValue "STORE_LOG" "store_files" ini
+  case storeType of
+    "memory" -> run $ XSCMemory (enableStoreLog $> storeLogFilePath)
+    "database" ->
+#if defined(dbServerPostgres)
+      run $ XSCDatabase PostgresFileStoreCfg {..}
+#else
+      exitError "server not compiled with Postgres support"
+#endif
+    _ -> exitError $ "Invalid store_files value: " <> storeType
+  where
+    run :: FileStoreClass s => XFTPStoreConfig s -> IO ()
+    run storeCfg = do
+      env <- newXFTPServerEnv storeCfg config
+      runReaderT (xftpServer config) env
+```
+
+**`newXFTPServerEnv` refactored signature:**
+
+```haskell
+newXFTPServerEnv :: FileStoreClass s => XFTPStoreConfig s -> XFTPServerConfig -> IO (XFTPEnv s)
+newXFTPServerEnv storeCfg config = do
+  (store, storeLog) <- case storeCfg of
+    XSCMemory storeLogPath -> do
+      st <- newFileStore ()
+      sl <- mapM (`readWriteFileStore` st) storeLogPath
+      pure (st, sl)
+    XSCDatabase dbCfg -> do
+      st <- newFileStore dbCfg
+      pure (st, Nothing)  -- main storeLog disabled for Postgres
+  usedStorage <- newTVarIO =<< getUsedStorage store
+  ...
+  pure XFTPEnv {config, store, usedStorage, storeLog, ...}
+```
+
+### Startup Config Validation
+
+Following SMP's `checkMsgStoreMode` pattern, `Main.hs` validates config before starting:
+
+- **`store_files=database` + StoreLog file exists** (without `db_store_log=on`): Error — "StoreLog file present but store_files is `database`. Use `xftp-server database import` to migrate, or set `db_store_log: on`."
+- **`store_files=database` + schema doesn't exist**: Error — "Create schema in PostgreSQL or use `xftp-server database import`."
+- **`store_files=memory` + Postgres schema exists**: Warning — "Postgres schema exists but store_files is `memory`. Data in Postgres will not be used."
+- **Binary compiled without `server_postgres` + `store_files=database`**: Error — "Server not compiled with Postgres support."
+
+## Module Structure
+
+```
+src/Simplex/FileTransfer/Server/
+  Store.hs                    -- FileStoreClass typeclass + shared types (FileRec, FileRecipient, etc.)
+  Store/
+    STM.hs                    -- STMFileStore (extracted from current Store.hs)
+    Postgres.hs               -- PostgresFileStore                [CPP-guarded]
+    Postgres/
+      Migrations.hs           -- Schema migrations                [CPP-guarded]
+      Config.hs               -- PostgresFileStoreCfg             [CPP-guarded]
+  StoreLog.hs                 -- Unchanged (interchange format for both backends + migration)
+  Env.hs                      -- XFTPStoreConfig GADT, polymorphic XFTPEnv
+  Main.hs                     -- Store selection, migration CLI commands
+  Server.hs                   -- Polymorphic over FileStoreClass
+```
+
+## PostgreSQL Schema
+
+Initial migration (`20260325_initial`):
+
+```sql
+CREATE TABLE files (
+  sender_id BYTEA NOT NULL PRIMARY KEY,
+  file_size INT4 NOT NULL,
+  file_digest BYTEA NOT NULL,
+  sender_key BYTEA NOT NULL,
+  file_path TEXT,
+  created_at INT8 NOT NULL,
+  status TEXT NOT NULL DEFAULT 'active'
+);
+
+CREATE TABLE recipients (
+  recipient_id BYTEA NOT NULL PRIMARY KEY,
+  sender_id BYTEA NOT NULL REFERENCES files ON DELETE CASCADE,
+  recipient_key BYTEA NOT NULL
+);
+
+CREATE INDEX idx_recipients_sender_id ON recipients (sender_id);
+CREATE INDEX idx_files_created_at ON files (created_at);
+```
+
+- `file_size` is `INT4` matching `Word32` in `FileInfo.size`
+- `sender_key` and `recipient_key` stored as `BYTEA` using binary encoding via `C.encodePubKey` / `C.decodePubKey` (matching SMP's `ToField`/`FromField` instances for `APublicAuthKey` — includes algorithm type tag in the binary format)
+- `file_path` nullable (set after upload completes via `setFilePath`)
+- `ON DELETE CASCADE` for recipients when file is hard-deleted
+- `created_at` stores rounded epoch seconds (1-hour precision, `RoundedFileTime`)
+- `status` as TEXT via `StrEncoding` (`ServerEntityStatus`: `EntityActive`, `EntityBlocked info`, `EntityOff`)
+- Hard deletes (no `deleted_at` column)
+- No PL/pgSQL functions needed; `setFilePath` uses `WHERE file_path IS NULL` to prevent duplicate uploads (the `UPDATE` itself acquires a row-level lock)
+- `used_storage` computed on startup: `SELECT COALESCE(SUM(file_size), 0) FROM files` (matches STM `countUsedStorage` — all files, see usedStorage Ownership section)
+
+### Migrations Module
+
+Following SMP's `QueueStore/Postgres/Migrations.hs` pattern:
+
+```haskell
+module Simplex.FileTransfer.Server.Store.Postgres.Migrations
+  ( xftpServerMigrations,
+  )
+where
+
+import Data.List (sortOn)
+import Data.Text (Text)
+import Simplex.Messaging.Agent.Store.Shared
+import Text.RawString.QQ (r)
+
+xftpSchemaMigrations :: [(String, Text, Maybe Text)]
+xftpSchemaMigrations =
+  [ ("20260325_initial", m20260325_initial, Nothing)
+  ]
+
+xftpServerMigrations :: [Migration]
+xftpServerMigrations = sortOn name $ map migration xftpSchemaMigrations
+  where
+    migration (name, up, down) = Migration {name, up, down = down}
+
+m20260325_initial :: Text
+m20260325_initial =
+  [r|
+CREATE TABLE files (
+  sender_id BYTEA NOT NULL PRIMARY KEY,
+  ...
+);
+  |]
+```
+
+The `Migration` type (from `Simplex.Messaging.Agent.Store.Shared`) has fields `{name :: String, up :: Text, down :: Maybe Text}`. Initial migration has `Nothing` for `down`. Future migrations should include `Just down_migration` for rollback support. Called via `createDBStore dbOpts xftpServerMigrations (MigrationConfig confirmMigrations Nothing)`.
+
+### Postgres Operations
+
+Key query patterns:
+
+- **`addFile`**: `INSERT INTO files (...) VALUES (...)`, return `DUPLICATE_` on unique violation.
+- **`setFilePath`**: `UPDATE files SET file_path = ? WHERE sender_id = ? AND file_path IS NULL`, verified with `assertUpdated` (returns `AUTH` if 0 rows affected — file not found or already uploaded). The `WHERE file_path IS NULL` prevents duplicate uploads; the `UPDATE` acquires a row lock implicitly. Only persists the path; `usedStorage` managed by server.
+- **`addRecipient`**: `INSERT INTO recipients (...)`, plus check for duplicates. No need for `recipientIds` TVar update — Postgres derives it from the table.
+- **`getFile`** (sender): `SELECT ... FROM files WHERE sender_id = ?`, returns auth key from `sender_key` column.
+- **`getFile`** (recipient): `SELECT f.*, r.recipient_key FROM recipients r JOIN files f ON ... WHERE r.recipient_id = ?`.
+- **`deleteFile`**: `DELETE FROM files WHERE sender_id = ?` (recipients cascade).
+- **`blockFile`**: `UPDATE files SET status = ? WHERE sender_id = ?`. When `deleted = True`, the server adjusts `usedStorage` externally (matching current STM behavior where `blockFile` only updates status and storage, not `filePath`).
+- **`expiredFiles`**: `SELECT sender_id, file_path, file_size FROM files WHERE created_at + ? < ? LIMIT ?` — batched query replaces per-file iteration, includes `file_size` for `usedStorage` adjustment. Called in a loop until no rows returned.
+
+## INI Configuration
+
+New keys in `[STORE_LOG]` section:
+
+```ini
+[STORE_LOG]
+enable: on
+store_files: memory            # memory | database
+db_connection: postgresql://xftp@/xftp_server_store
+db_schema: xftp_server
+db_pool_size: 10
+db_store_log: off
+expire_files_hours: 48
+```
+
+`store_files` selects the backend (`store_files` rather than `store_queues` because XFTP stores files, not queues):
+- `memory` -> `XSCMemory` (current behavior)
+- `database` -> `XSCDatabase` (requires `server_postgres` build flag)
+
+### INI Template Generation (`xftp-server init`)
+
+The `iniFileContent` function in `Main.hs` must be updated to generate the new keys in the `[STORE_LOG]` section. Following SMP's `iniDbOpts` pattern with `optDisabled'` (prefixes `"# "` when value equals default), Postgres keys are generated commented out by default:
+
+```ini
+[STORE_LOG]
+enable: on
+
+# File storage mode: `memory` or `database` (PostgreSQL).
+store_files: memory
+
+# Database connection settings for PostgreSQL database (`store_files: database`).
+# db_connection: postgresql://xftp@/xftp_server_store
+# db_schema: xftp_server
+# db_pool_size: 10
+
+# Write database changes to store log file
+# db_store_log: off
+
+expire_files_hours: 48
+```
+
+Reuses `iniDBOptions` from `Simplex.Messaging.Server.CLI` for runtime parsing (falls back to defaults when keys are commented out or missing). `enableDbStoreLog'` pattern (`settingIsOn "STORE_LOG" "db_store_log"`) controls `dbStoreLogPath`.
+
+### PostgresFileStoreCfg
+
+```haskell
+data PostgresFileStoreCfg = PostgresFileStoreCfg
+  { dbOpts :: DBOpts,
+    dbStoreLogPath :: Maybe FilePath,
+    confirmMigrations :: MigrationConfirmation
+  }
+```
+
+No `deletedTTL` (hard deletes).
+
+### Default DB Options
+
+```haskell
+defaultXFTPDBOpts :: DBOpts
+defaultXFTPDBOpts =
+  DBOpts
+    { connstr = "postgresql://xftp@/xftp_server_store",
+      schema = "xftp_server",
+      poolSize = 10,
+      createSchema = False
+    }
+```
+
+## Migration CLI
+
+Bidirectional migration via StoreLog as interchange format:
+
+```
+xftp-server database import [--database DB_CONN] [--schema DB_SCHEMA] [--pool-size N]
+xftp-server database export [--database DB_CONN] [--schema DB_SCHEMA] [--pool-size N]
+```
+
+No `--table` flag needed (unlike SMP which has queues/messages/all) — XFTP has a single entity type (files + recipients, always migrated together).
+
+CLI options reuse `dbOptsP` parser from `Simplex.Messaging.Server.CLI`.
+
+### Import (StoreLog -> PostgreSQL)
+
+1. Confirm: prompt user with database connection details and StoreLog path
+2. Read and replay StoreLog into temporary `STMFileStore`
+3. Connect to PostgreSQL, run schema migrations (`createSchema = True`, `confirmMigrations = MCYesUp`)
+4. Batch-insert file records into `files` table using PostgreSQL COPY protocol (matching SMP's `batchInsertQueues` pattern for performance). Progress reported every 10k files.
+5. Batch-insert recipient records into `recipients` table using COPY protocol
+6. Verify counts: `SELECT COUNT(*) FROM files` / `recipients` — warn if mismatch
+7. Rename StoreLog to `.bak` (prevents accidental re-import, preserves original for rollback)
+8. Report counts
+
+### Export (PostgreSQL -> StoreLog)
+
+1. Confirm: prompt user with database connection details and output path. Fail if output file already exists.
+2. Connect to PostgreSQL
+3. Open new StoreLog file for writing
+4. Fold over all file records, writing per file (in this order, matching existing `writeFileStore`): `AddFile` (with `ServerEntityStatus` — this preserves `EntityBlocked` state), `AddRecipients`, then `PutFile` (if `file_path` is set)
+5. Report counts
+
+Note: `AddFile` carries `ServerEntityStatus` which includes `EntityBlocked info`, so blocking state is preserved through export/import without needing separate `BlockFile` log entries.
+
+File data on disk is untouched by migration — only metadata moves between backends.
+
+## Cabal Integration
+
+Shared `server_postgres` flag. New Postgres modules added to existing conditional block:
+
+```cabal
+if flag(server_postgres)
+  cpp-options: -DdbServerPostgres
+  exposed-modules:
+    ...existing SMP modules...
+    Simplex.FileTransfer.Server.Store.Postgres
+    Simplex.FileTransfer.Server.Store.Postgres.Migrations
+    Simplex.FileTransfer.Server.Store.Postgres.Config
+```
+
+CPP guards (`#if defined(dbServerPostgres)`) in:
+- `Store.hs` — Postgres `FromField`/`ToField` instances for XFTP-specific types if needed
+- `Env.hs` — `XSCDatabase` constructor
+- `Main.hs` — database CLI commands, store selection for `database` mode, Postgres imports
+- `Server.hs` — Postgres-specific imports if needed
+
+## Testing
+
+- **Parameterized server tests**: Existing `xftpServerTests` refactored to accept a store type parameter (following SMP's `SpecWith (ASrvTransport, AStoreType)` pattern). The same server tests run against both STM and Postgres backends — STM tests run unconditionally, Postgres tests added under `#if defined(dbServerPostgres)` with `postgressBracket` for database lifecycle (drop → create → test → drop).
+- **Unit tests**: `PostgresFileStore` operations — add/get/delete/block/expire, duplicate detection, auth errors
+- **Migration round-trip**: STM store → export to StoreLog → import to Postgres → export back → verify StoreLog equality (including blocked file status)
+- **Tests location**: in `tests/` alongside existing XFTP tests, guarded by `server_postgres` CPP flag
+- **Test database**: PostgreSQL on `localhost:5432`, using a dedicated `xftp_server_test` schema (dropped and recreated per test run via `postgressBracket`, following SMP's test database lifecycle pattern)
+- **Test fixtures**: `testXFTPStoreDBOpts :: DBOpts` with `createSchema = True`, `confirmMigrations = MCYesUp`, in `tests/XFTPClient.hs`

plans/2026-03-25-xftp-postgres-implementation-plan.md

@@ -0,0 +1,648 @@
+# XFTP PostgreSQL Backend — Implementation Plan
+
+> **For agentic workers:** REQUIRED: Use superpowers-extended-cc:subagent-driven-development (if subagents available) or superpowers-extended-cc:executing-plans to implement this plan. Steps use checkbox (`- [ ]`) syntax for tracking.
+
+**Goal:** Add PostgreSQL backend support to xftp-server as an alternative to STM + StoreLog, with bidirectional migration.
+
+**Architecture:** Introduce `FileStoreClass` typeclass (IO-based, following `QueueStoreClass` pattern). Extract current STM store into `Store/STM.hs`, make `Server.hs` polymorphic, then add `Store/Postgres.hs` behind `server_postgres` CPP flag. `usedStorage` moves from store to `XFTPEnv` so the server manages quota tracking externally.
+
+**Tech Stack:** Haskell, postgresql-simple, STM, fourmolu, cabal with CPP flags
+
+**Design spec:** `plans/2026-03-25-xftp-postgres-backend-design.md`
+
+---
+
+## File Structure
+
+**Existing files modified:**
+- `src/Simplex/FileTransfer/Server/Store.hs` — rewritten: becomes typeclass + shared types
+- `src/Simplex/FileTransfer/Server/Env.hs` — polymorphic `XFTPEnv s`, `XFTPStoreConfig` GADT
+- `src/Simplex/FileTransfer/Server.hs` — polymorphic over `FileStoreClass s`
+- `src/Simplex/FileTransfer/Server/StoreLog.hs` — update for IO store functions
+- `src/Simplex/FileTransfer/Server/Main.hs` — INI config, dispatch, CLI commands
+- `simplexmq.cabal` — new modules
+- `tests/XFTPClient.hs` — Postgres test fixtures
+- `tests/Test.hs` — Postgres test group
+
+**New files created:**
+- `src/Simplex/FileTransfer/Server/Store/STM.hs` — `STMFileStore` (extracted from current `Store.hs`)
+- `src/Simplex/FileTransfer/Server/Store/Postgres.hs` — `PostgresFileStore` [CPP-guarded]
+- `src/Simplex/FileTransfer/Server/Store/Postgres/Config.hs` — `PostgresFileStoreCfg` [CPP-guarded]
+- `src/Simplex/FileTransfer/Server/Store/Postgres/Migrations.hs` — schema SQL [CPP-guarded]
+- `tests/CoreTests/XFTPStoreTests.hs` — Postgres store unit tests [CPP-guarded]
+
+---
+
+## Task 1: Move `usedStorage` from `FileStore` to `XFTPEnv`
+
+**Files:**
+- Modify: `src/Simplex/FileTransfer/Server/Store.hs`
+- Modify: `src/Simplex/FileTransfer/Server/Env.hs`
+- Modify: `src/Simplex/FileTransfer/Server.hs`
+
+- [ ] **Step 1: Remove `usedStorage` from `FileStore` in `Store.hs`**
+
+  1. Remove `usedStorage :: TVar Int64` field from `FileStore` record (line 47).
+  2. Remove `usedStorage <- newTVarIO 0` from `newFileStore` (line 75) and drop the field from the record construction (line 76).
+  3. In `setFilePath` (line 92-97): remove `modifyTVar' (usedStorage st) (+ fromIntegral (size fileInfo))` — keep only `writeTVar filePath (Just fPath)`. Change pattern from `\FileRec {fileInfo, filePath}` to `\FileRec {filePath}` (fileInfo is now unused — `-Wunused-matches` error).
+  4. In `deleteFile` (line 112-119): remove `modifyTVar' usedStorage $ subtract (fromIntegral $ size fileInfo)`. Change outer pattern match from `FileStore {files, recipients, usedStorage}` to `FileStore {files, recipients}`. Change inner pattern from `Just FileRec {fileInfo, recipientIds}` to `Just FileRec {recipientIds}` (`fileInfo` is now unused — `-Wunused-matches` error).
+  5. In `blockFile` (line 122-127): remove `when deleted $ modifyTVar' usedStorage $ subtract (fromIntegral $ size fileInfo)`. Change pattern match from `st@FileStore {usedStorage}` to `st`. The `deleted` parameter and `fileInfo` in the inner pattern become unused — prefix with `_` or remove from pattern to avoid `-Wunused-matches`.
+
+- [ ] **Step 2: Add `usedStorage` to `XFTPEnv` in `Env.hs`**
+
+  1. Add `usedStorage :: TVar Int64` field to `XFTPEnv` record (between `store` and `storeLog`, line 93).
+  2. In `newXFTPServerEnv` (line 112-126): replace lines 117-118:
+     ```
+     used <- countUsedStorage <$> readTVarIO (files store)
+     atomically $ writeTVar (usedStorage store) used
+     ```
+     with:
+     ```
+     usedStorage <- newTVarIO =<< countUsedStorage <$> readTVarIO (files store)
+     ```
+  3. Add `usedStorage` to the `pure XFTPEnv {..}` construction.
+
+- [ ] **Step 3: Update all `usedStorage` access sites in `Server.hs`**
+
+  1. Line 552: `us <- asks $ usedStorage . store` → `us <- asks usedStorage`.
+  2. Line 569: `us <- asks $ usedStorage . store` → `us <- asks usedStorage`.
+  3. Line 639: `usedStart <- readTVarIO $ usedStorage st` → `usedStart <- readTVarIO =<< asks usedStorage`.
+  4. Line 647: `usedEnd <- readTVarIO $ usedStorage st` → `usedEnd <- readTVarIO =<< asks usedStorage`.
+  5. Line 694: `FileStore {files, usedStorage} <- asks store` → split into `FileStore {files} <- asks store` and `usedStorage <- asks usedStorage`.
+  6. In `deleteOrBlockServerFile_` (line 620): after `void $ atomically $ storeAction st`, add usedStorage adjustment — `us <- asks usedStorage` then `atomically $ modifyTVar' us $ subtract (fromIntegral $ size fileInfo)` when file had a path (check `path` from `readTVarIO filePath` earlier in the function).
+
+- [ ] **Step 4: Build and verify**
+
+  Run: `cabal build`
+
+- [ ] **Step 5: Run existing tests**
+
+  Run: `cabal test --test-show-details=streaming --test-option=--match="/XFTP/"`
+
+- [ ] **Step 6: Format and commit**
+
+  ```bash
+  fourmolu -i src/Simplex/FileTransfer/Server/Store.hs src/Simplex/FileTransfer/Server/Env.hs src/Simplex/FileTransfer/Server.hs
+  git add src/Simplex/FileTransfer/Server/Store.hs src/Simplex/FileTransfer/Server/Env.hs src/Simplex/FileTransfer/Server.hs
+  git commit -m "refactor(xftp): move usedStorage from FileStore to XFTPEnv"
+  ```
+
+---
+
+## Task 2: Add `getUsedStorage`, `getFileCount`, `expiredFiles` functions
+
+**Files:**
+- Modify: `src/Simplex/FileTransfer/Server/Store.hs`
+- Modify: `src/Simplex/FileTransfer/Server/Env.hs`
+- Modify: `src/Simplex/FileTransfer/Server.hs`
+
+- [ ] **Step 1: Add three new functions to `Store.hs`**
+
+  1. Add to exports: `getUsedStorage`, `getFileCount`, `expiredFiles`.
+  2. Remove `expiredFilePath` from exports AND delete the function definition (dead code → `-Wunused-binds` error). Also remove `($>>=)` from import `Simplex.Messaging.Util (ifM, ($>>=))` → `Simplex.Messaging.Util (ifM)` — `$>>=` was only used by `expiredFilePath`.
+  3. Add import: `qualified Data.Map.Strict as M` (needed for `M.foldl'` in `getUsedStorage` and `M.toList` in `expiredFiles`).
+  4. Implement:
+     ```haskell
+     getUsedStorage :: FileStore -> IO Int64
+     getUsedStorage FileStore {files} =
+       M.foldl' (\acc FileRec {fileInfo = FileInfo {size}} -> acc + fromIntegral size) 0 <$> readTVarIO files
+
+     getFileCount :: FileStore -> IO Int
+     getFileCount FileStore {files} = M.size <$> readTVarIO files
+
+     expiredFiles :: FileStore -> Int64 -> Int -> IO [(SenderId, Maybe FilePath, Word32)]
+     expiredFiles FileStore {files} old _limit = do
+       fs <- readTVarIO files
+       fmap catMaybes . forM (M.toList fs) $ \(sId, FileRec {fileInfo = FileInfo {size}, filePath, createdAt = RoundedSystemTime createdAt}) ->
+         if createdAt + fileTimePrecision < old
+           then do
+             path <- readTVarIO filePath
+             pure $ Just (sId, path, size)
+           else pure Nothing
+     ```
+  5. Add imports: `Data.Maybe (catMaybes)`, `Data.Word (Word32)` (note: `qualified Data.Map.Strict as M` already added in item 3).
+
+- [ ] **Step 2: Replace `countUsedStorage` in `Env.hs`**
+
+  1. Replace `countUsedStorage <$> readTVarIO (files store)` with `getUsedStorage store` in `newXFTPServerEnv`.
+  2. Remove `countUsedStorage` function definition and its export.
+  3. Remove `qualified Data.Map.Strict as M` import if no longer used.
+
+- [ ] **Step 3: Update `restoreServerStats` in `Server.hs` to use `getFileCount`**
+
+  In `restoreServerStats` (line 694-696): replace `FileStore {files} <- asks store` and `_filesCount <- M.size <$> readTVarIO files` with `st <- asks store` and `_filesCount <- liftIO $ getFileCount st` (eliminates the `FileStore` pattern match — `files` binding no longer needed).
+
+- [ ] **Step 4: Replace `expireServerFiles` iteration in `Server.hs`**
+
+  1. Replace the body of `expireServerFiles` (lines 636-660). Remove `files' <- readTVarIO (files st)` and the `forM_ (M.keys files')` loop.
+  2. New body: call `expiredFiles st old 10000` in a loop. For each `(sId, filePath_, fileSize)` in returned list: apply `itemDelay`, remove disk file if present, call `atomically $ deleteFile st sId`, adjust `usedStorage` TVar by `fileSize`, increment `filesExpired` stat. Loop until `expiredFiles` returns `[]`.
+  3. Remove `Data.Map.Strict` import from Server.hs if no longer needed (was used for `M.size` and `M.keys` — now replaced by `getFileCount` and `expiredFiles`).
+
+- [ ] **Step 5: Build and verify**
+
+  Run: `cabal build`
+
+- [ ] **Step 6: Run existing tests**
+
+  Run: `cabal test --test-show-details=streaming --test-option=--match="/XFTP/"`
+
+- [ ] **Step 7: Format and commit**
+
+  ```bash
+  fourmolu -i src/Simplex/FileTransfer/Server/Store.hs src/Simplex/FileTransfer/Server/Env.hs src/Simplex/FileTransfer/Server.hs
+  git add src/Simplex/FileTransfer/Server/Store.hs src/Simplex/FileTransfer/Server/Env.hs src/Simplex/FileTransfer/Server.hs
+  git commit -m "refactor(xftp): add getUsedStorage, getFileCount, expiredFiles store functions"
+  ```
+
+---
+
+## Task 3: Change `Store.hs` functions from STM to IO
+
+**Files:**
+- Modify: `src/Simplex/FileTransfer/Server/Store.hs`
+- Modify: `src/Simplex/FileTransfer/Server.hs`
+- Modify: `src/Simplex/FileTransfer/Server/StoreLog.hs`
+
+- [ ] **Step 1: Change all Store.hs function signatures from STM to IO**
+
+  For each of: `addFile`, `setFilePath`, `addRecipient`, `getFile`, `deleteFile`, `blockFile`, `deleteRecipient`, `ackFile`:
+  1. Change return type from `STM (Either XFTPErrorType ...)` to `IO (Either XFTPErrorType ...)` (or `STM ()` to `IO ()` for `deleteRecipient`).
+  2. Wrap the function body in `atomically $ do ...`.
+  3. Keep `withFile` and `newFileRec` as internal STM helpers (called inside the `atomically` blocks).
+
+- [ ] **Step 2: Update Server.hs call sites — remove `atomically` wrappers**
+
+  1. Line 563 (`receiveServerFile`): change `atomically $ writeTVar filePath (Just fPath)` → add `st <- asks store` then `void $ liftIO $ setFilePath st senderId fPath` (design call site #1 — `store` is not in scope in `receiveServerFile`'s `receive` helper, so bind via `asks`; `void` avoids `-Wunused-do-bind` warning on the `Either` result).
+  2. Line 453 (`verifyXFTPTransmission`): split `atomically $ verify =<< getFile st party fId` into: `liftIO (getFile st party fId)` (IO→M lift), then pattern match on result, use `readTVarIO (fileStatus fr)` instead of `readTVar`.
+  3. Lines 371, 377 (control port `CPDelete`/`CPBlock`): change `ExceptT $ atomically $ getFile fs SFRecipient fileId` → `ExceptT $ liftIO $ getFile fs SFRecipient fileId` (inside `unliftIO u $ do` block which runs in M monad — `liftIO` required to lift IO into M).
+  4. Line 508 (`addFile` in `createFile`): the `ExceptT $ addFile st sId file ts EntityActive` — `addFile` is now IO, `ExceptT` wraps IO directly. Remove any `atomically`.
+  5. Line 514 (`addRecipient`): same — `ExceptT . addRecipient st sId` works directly in IO.
+  6. Line 516 (`retryAdd`): change parameter type from `(XFTPFileId -> STM (Either XFTPErrorType a))` to `(XFTPFileId -> IO (Either XFTPErrorType a))`. Line 520: change `atomically (add fId)` to `liftIO (add fId)`.
+  7. Line 605 (`ackFileReception`): change `atomically $ deleteRecipient st rId fr` to `liftIO $ deleteRecipient st rId fr`.
+  8. Line 620 (`deleteOrBlockServerFile_`): change third parameter type from `(FileStore -> STM (Either XFTPErrorType ()))` to `(FileStore -> IO (Either XFTPErrorType ()))`. Line 626: change `void $ atomically $ storeAction st` to `void $ liftIO $ storeAction st`.
+  9. `expireServerFiles` `delete` helper: change `atomically $ deleteFile st sId` to `liftIO $ deleteFile st sId` (deleteFile is now IO; `liftIO` required because the helper runs in M monad, not IO).
+
+- [ ] **Step 3: Update `StoreLog.hs` — remove `atomically` from replay**
+
+  In `readFileStore` (line 93), function `addToStore`:
+  1. Change `atomically (addToStore lr)` to `addToStore lr` — store functions are now IO.
+  2. The `addToStore` body calls `addFile`, `setFilePath`, `deleteFile`, `blockFile`, `ackFile` — all IO now, no `atomically` needed.
+  3. For `AddRecipients`: `runExceptT $ mapM_ (ExceptT . addRecipient st sId) rcps` — `addRecipient` returns `IO (Either ...)`, so `ExceptT . addRecipient st sId` works directly.
+
+- [ ] **Step 4: Build and verify**
+
+  Run: `cabal build`
+
+- [ ] **Step 5: Run existing tests**
+
+  Run: `cabal test --test-show-details=streaming --test-option=--match="/XFTP/"`
+
+- [ ] **Step 6: Format and commit**
+
+  ```bash
+  fourmolu -i src/Simplex/FileTransfer/Server/Store.hs src/Simplex/FileTransfer/Server.hs src/Simplex/FileTransfer/Server/StoreLog.hs
+  git add src/Simplex/FileTransfer/Server/Store.hs src/Simplex/FileTransfer/Server.hs src/Simplex/FileTransfer/Server/StoreLog.hs
+  git commit -m "refactor(xftp): change file store operations from STM to IO"
+  ```
+
+---
+
+## Task 4: Extract `FileStoreClass` typeclass, move STM impl to `Store/STM.hs`
+
+**Files:**
+- Rewrite: `src/Simplex/FileTransfer/Server/Store.hs`
+- Create: `src/Simplex/FileTransfer/Server/Store/STM.hs`
+- Modify: `src/Simplex/FileTransfer/Server/StoreLog.hs`
+- Modify: `src/Simplex/FileTransfer/Server/Env.hs`
+- Modify: `src/Simplex/FileTransfer/Server.hs`
+- Modify: `simplexmq.cabal`
+
+- [ ] **Step 1: Create `Store/STM.hs` — move all implementation code**
+
+  1. Create directory `src/Simplex/FileTransfer/Server/Store/`.
+  2. Create `src/Simplex/FileTransfer/Server/Store/STM.hs`.
+  3. Move from `Store.hs`: `FileStore` data type (rename to `STMFileStore`), all function implementations, internal helpers (`withFile`, `newFileRec`), all STM-specific imports.
+  4. Rename all `FileStore` references to `STMFileStore` in the new file.
+  5. Module declaration: `module Simplex.FileTransfer.Server.Store.STM` exporting only `STMFileStore (..)` — do NOT export standalone functions (`addFile`, `setFilePath`, etc.) to avoid name collisions with the typeclass methods from `Store.hs`.
+
+- [ ] **Step 2: Rewrite `Store.hs` as the typeclass module**
+
+  1. Add `{-# LANGUAGE TypeFamilies #-}` pragma to `Store.hs` (required for `type FileStoreConfig s` associated type).
+  2. Keep in `Store.hs`: `FileRec (..)`, `FileRecipient (..)`, `RoundedFileTime`, `fileTimePrecision` definitions and their `StrEncoding` instance.
+  3. Add `FileStoreClass` typeclass:
+     ```haskell
+     class FileStoreClass s where
+       type FileStoreConfig s
+
+       -- Lifecycle
+       newFileStore :: FileStoreConfig s -> IO s
+       closeFileStore :: s -> IO ()
+
+       -- File operations
+       addFile :: s -> SenderId -> FileInfo -> RoundedFileTime -> ServerEntityStatus -> IO (Either XFTPErrorType ())
+       setFilePath :: s -> SenderId -> FilePath -> IO (Either XFTPErrorType ())
+       addRecipient :: s -> SenderId -> FileRecipient -> IO (Either XFTPErrorType ())
+       getFile :: s -> SFileParty p -> XFTPFileId -> IO (Either XFTPErrorType (FileRec, C.APublicAuthKey))
+       deleteFile :: s -> SenderId -> IO (Either XFTPErrorType ())
+       blockFile :: s -> SenderId -> BlockingInfo -> Bool -> IO (Either XFTPErrorType ())
+       deleteRecipient :: s -> RecipientId -> FileRec -> IO ()
+       ackFile :: s -> RecipientId -> IO (Either XFTPErrorType ())
+
+       -- Expiration
+       expiredFiles :: s -> Int64 -> Int -> IO [(SenderId, Maybe FilePath, Word32)]
+
+       -- Stats
+       getUsedStorage :: s -> IO Int64
+       getFileCount :: s -> IO Int
+     ```
+  4. Do NOT re-export from `Store/STM.hs` — this would create a circular module dependency (Store.hs imports Store/STM.hs, Store/STM.hs imports Store.hs). Consumers must import `Store.STM` directly where they need `STMFileStore`.
+  5. Remove all STM-specific imports that are no longer needed.
+
+- [ ] **Step 3: Add `FileStoreClass` instance in `Store/STM.hs`**
+
+  1. Import `FileStoreClass` from `Simplex.FileTransfer.Server.Store`.
+  2. Inline all implementations directly in the instance body (do NOT delegate to standalone functions — the standalone names collide with typeclass method names, causing ambiguous occurrences for importers):
+     ```haskell
+     instance FileStoreClass STMFileStore where
+       type FileStoreConfig STMFileStore = ()
+       newFileStore () = do
+         files <- TM.emptyIO
+         recipients <- TM.emptyIO
+         pure STMFileStore {files, recipients}
+       closeFileStore _ = pure ()
+       addFile st sId fileInfo createdAt status = atomically $ ...
+       setFilePath st sId fPath = atomically $ ...
+       -- ... (each method's body is the existing function body, inlined)
+     ```
+  3. Remove the standalone top-level function definitions — they are now instance methods. Keep only `withFile` and `newFileRec` as internal helpers used by the instance methods.
+
+- [ ] **Step 4: Update importers**
+
+  1. `Env.hs`: add `import Simplex.FileTransfer.Server.Store.STM (STMFileStore (..))`. Change `FileStore` → `STMFileStore` in `XFTPEnv` type and `newXFTPServerEnv`. Change `store <- newFileStore` to `store <- newFileStore ()` (typeclass method now takes `FileStoreConfig STMFileStore` which is `()`). Keep `import Simplex.FileTransfer.Server.Store` for `FileRec`, `FileRecipient`, `FileStoreClass`, etc.
+  2. `Server.hs`: add `import Simplex.FileTransfer.Server.Store.STM`. Change `FileStore` → `STMFileStore` in any explicit type annotations. Import `FileStoreClass` from `Simplex.FileTransfer.Server.Store`.
+  3. `StoreLog.hs`: add `import Simplex.FileTransfer.Server.Store.STM` to access concrete `STMFileStore` type and store functions used during log replay. Change `FileStore` → `STMFileStore` in `readWriteFileStore` and `writeFileStore` parameter types.
+
+- [ ] **Step 5: Update cabal file**
+
+  Add `Simplex.FileTransfer.Server.Store.STM` to `exposed-modules` in the `!flag(client_library)` section, alongside existing XFTP server modules.
+
+- [ ] **Step 6: Build and verify**
+
+  Run: `cabal build`
+
+- [ ] **Step 7: Run existing tests**
+
+  Run: `cabal test --test-show-details=streaming --test-option=--match="/XFTP/"`
+
+- [ ] **Step 8: Format and commit**
+
+  ```bash
+  fourmolu -i src/Simplex/FileTransfer/Server/Store.hs src/Simplex/FileTransfer/Server/Store/STM.hs src/Simplex/FileTransfer/Server/Env.hs src/Simplex/FileTransfer/Server.hs src/Simplex/FileTransfer/Server/StoreLog.hs
+  git add src/Simplex/FileTransfer/Server/Store.hs src/Simplex/FileTransfer/Server/Store/STM.hs src/Simplex/FileTransfer/Server/Env.hs src/Simplex/FileTransfer/Server.hs src/Simplex/FileTransfer/Server/StoreLog.hs simplexmq.cabal
+  git commit -m "refactor(xftp): extract FileStoreClass typeclass, move STM impl to Store.STM"
+  ```
+
+---
+
+## Task 5: Make `XFTPEnv` and `Server.hs` polymorphic over `FileStoreClass`
+
+**Files:**
+- Modify: `src/Simplex/FileTransfer/Server/Env.hs`
+- Modify: `src/Simplex/FileTransfer/Server.hs`
+- Modify: `src/Simplex/FileTransfer/Server/Main.hs`
+- Modify: `tests/XFTPClient.hs` (if it calls `runXFTPServerBlocking` directly)
+
+- [ ] **Step 1: Make `XFTPEnv` polymorphic in `Env.hs`**
+
+  1. Add `XFTPStoreConfig` GADT: `data XFTPStoreConfig s where XSCMemory :: Maybe FilePath -> XFTPStoreConfig STMFileStore`.
+  2. Change `data XFTPEnv` to `data XFTPEnv s` — field `store :: FileStore` becomes `store :: s`.
+  3. Change `newXFTPServerEnv :: XFTPServerConfig -> IO XFTPEnv` to `newXFTPServerEnv :: FileStoreClass s => XFTPStoreConfig s -> XFTPServerConfig -> IO (XFTPEnv s)`.
+  4. Pattern match on `XSCMemory storeLogPath` in `newXFTPServerEnv` body. Create store via `newFileStore ()`, storeLog via `mapM (`readWriteFileStore` st) storeLogPath`.
+
+- [ ] **Step 2: Make `Server.hs` polymorphic**
+
+  1. Change `type M a = ReaderT XFTPEnv IO a` to `type M s a = ReaderT (XFTPEnv s) IO a`.
+  2. Add `FileStoreClass s =>` constraint to all functions using `M s a`. Use `forall s.` in signatures of functions that have `where`-block bindings with `M s` type annotations — `ScopedTypeVariables` requires explicit `forall` to bring `s` into scope for inner type signatures (matching SMP's `smpServer :: forall s. MsgStoreClass s => ...` pattern). Full list: `xftpServer`, `processRequest`, `verifyXFTPTransmission`, `processXFTPRequest` and all its `where`-bound functions (`createFile`, `addRecipients`, `receiveServerFile`, `sendServerFile`, `deleteServerFile`, `ackFileReception`, `retryAdd`, `addFileRetry`, `addRecipientRetry`), `deleteServerFile_`, `blockServerFile`, `deleteOrBlockServerFile_`, `expireServerFiles`, `randomId`, `getFileId`, `withFileLog`, `incFileStat`, `saveServerStats`, `restoreServerStats`, `randomDelay` (inside `#ifdef slow_servers` CPP block). Also update `encodeXftp` (line 236) and `runCPClient` (line 339) which use explicit `ReaderT XFTPEnv IO` instead of the `M` alias — change to `ReaderT (XFTPEnv s) IO`.
+  3. Change `runXFTPServerBlocking` and `runXFTPServer` to take `XFTPStoreConfig s` parameter.
+  4. Add `closeFileStore store` call to the server shutdown path (in the `finally` block or `stopServer` equivalent — after saving stats, before logging "Server stopped"). This ensures Postgres connection pool and `dbStoreLog` are properly closed. For STM this is a no-op.
+
+- [ ] **Step 3: Update `Main.hs` dispatch**
+
+  1. In `runServer`: construct `XSCMemory (enableStoreLog $> storeLogFilePath)`.
+  2. Add dispatch function that calls the updated `runXFTPServer` (which creates `started` internally):
+     ```haskell
+     run :: FileStoreClass s => XFTPStoreConfig s -> IO ()
+     run storeCfg = runXFTPServer storeCfg serverConfig
+     ```
+  3. Call `run` with the `XSCMemory` config.
+
+- [ ] **Step 4: Update test helper if needed**
+
+  If `tests/XFTPClient.hs` calls `runXFTPServerBlocking` directly, update the call to pass an `XSCMemory` config. Check the `withXFTPServer` / `serverBracket` helper.
+
+- [ ] **Step 5: Build and verify**
+
+  Run: `cabal build && cabal build test:simplexmq-test`
+
+- [ ] **Step 6: Run existing tests**
+
+  Run: `cabal test --test-show-details=streaming --test-option=--match="/XFTP/"`
+
+- [ ] **Step 7: Format and commit**
+
+  ```bash
+  fourmolu -i src/Simplex/FileTransfer/Server/Env.hs src/Simplex/FileTransfer/Server.hs src/Simplex/FileTransfer/Server/Main.hs
+  git add src/Simplex/FileTransfer/Server/Env.hs src/Simplex/FileTransfer/Server.hs src/Simplex/FileTransfer/Server/Main.hs tests/XFTPClient.hs simplexmq.cabal
+  git commit -m "refactor(xftp): make XFTPEnv and server polymorphic over FileStoreClass"
+  ```
+
+---
+
+## Task 6: Add Postgres config, migrations, and store skeleton
+
+**Files:**
+- Create: `src/Simplex/FileTransfer/Server/Store/Postgres/Config.hs`
+- Create: `src/Simplex/FileTransfer/Server/Store/Postgres/Migrations.hs`
+- Create: `src/Simplex/FileTransfer/Server/Store/Postgres.hs`
+- Modify: `src/Simplex/FileTransfer/Server/Env.hs`
+- Modify: `simplexmq.cabal`
+
+- [ ] **Step 1: Create `Store/Postgres/Config.hs`**
+
+  ```haskell
+  module Simplex.FileTransfer.Server.Store.Postgres.Config
+    ( PostgresFileStoreCfg (..),
+      defaultXFTPDBOpts,
+    )
+  where
+
+  import Simplex.Messaging.Agent.Store.Postgres.Options (DBOpts (..))
+  import Simplex.Messaging.Agent.Store.Shared (MigrationConfirmation)
+
+  data PostgresFileStoreCfg = PostgresFileStoreCfg
+    { dbOpts :: DBOpts,
+      dbStoreLogPath :: Maybe FilePath,
+      confirmMigrations :: MigrationConfirmation
+    }
+
+  defaultXFTPDBOpts :: DBOpts
+  defaultXFTPDBOpts =
+    DBOpts
+      { connstr = "postgresql://xftp@/xftp_server_store",
+        schema = "xftp_server",
+        poolSize = 10,
+        createSchema = False
+      }
+  ```
+
+- [ ] **Step 2: Create `Store/Postgres/Migrations.hs`**
+
+  Full migration module with `xftpServerMigrations :: [Migration]` and `m20260325_initial` containing CREATE TABLE SQL for `files` and `recipients` tables plus indexes. Follow SMP's `QueueStore/Postgres/Migrations.hs` pattern exactly: tuple list → `sortOn name . map migration`.
+
+- [ ] **Step 3: Create `Store/Postgres.hs` with stub instance**
+
+  1. Define `PostgresFileStore` with `dbStore :: DBStore` and `dbStoreLog :: Maybe (StoreLog 'WriteMode)`.
+  2. `instance FileStoreClass PostgresFileStore` with `error "not implemented"` for all methods except `newFileStore` (calls `createDBStore` + opens `dbStoreLog`) and `closeFileStore` (closes both). `type FileStoreConfig PostgresFileStore = PostgresFileStoreCfg`.
+  3. Add `withDB`, `handleDuplicate`, `assertUpdated`, `withLog` helpers.
+
+- [ ] **Step 4: Add `XSCDatabase` GADT constructor in `Env.hs` (CPP-guarded)**
+
+  ```haskell
+  #if defined(dbServerPostgres)
+  import Simplex.FileTransfer.Server.Store.Postgres (PostgresFileStore)
+  import Simplex.FileTransfer.Server.Store.Postgres.Config (PostgresFileStoreCfg)
+  #endif
+
+  data XFTPStoreConfig s where
+    XSCMemory :: Maybe FilePath -> XFTPStoreConfig STMFileStore
+  #if defined(dbServerPostgres)
+    XSCDatabase :: PostgresFileStoreCfg -> XFTPStoreConfig PostgresFileStore
+  #endif
+  ```
+
+- [ ] **Step 5: Update cabal**
+
+  Add to existing `if flag(server_postgres)` block:
+  ```
+  Simplex.FileTransfer.Server.Store.Postgres
+  Simplex.FileTransfer.Server.Store.Postgres.Config
+  Simplex.FileTransfer.Server.Store.Postgres.Migrations
+  ```
+
+- [ ] **Step 6: Build both ways**
+
+  Run: `cabal build && cabal build -fserver_postgres`
+
+- [ ] **Step 7: Format and commit**
+
+  ```bash
+  fourmolu -i src/Simplex/FileTransfer/Server/Store/Postgres.hs src/Simplex/FileTransfer/Server/Store/Postgres/Config.hs src/Simplex/FileTransfer/Server/Env.hs
+  git add src/Simplex/FileTransfer/Server/Store/Postgres.hs src/Simplex/FileTransfer/Server/Store/Postgres/Config.hs src/Simplex/FileTransfer/Server/Store/Postgres/Migrations.hs src/Simplex/FileTransfer/Server/Env.hs simplexmq.cabal
+  git commit -m "feat(xftp): add PostgreSQL store skeleton with schema migration"
+  ```
+
+---
+
+## Task 7: Implement `PostgresFileStore` operations
+
+**Files:**
+- Modify: `src/Simplex/FileTransfer/Server/Store/Postgres.hs`
+
+- [ ] **Step 1: Implement `addFile`**
+
+  `INSERT INTO files (sender_id, file_size, file_digest, sender_key, file_path, created_at, status) VALUES (?,?,?,?,NULL,?,?)`. Catch unique violation with `handleDuplicate` → `DUPLICATE_`. Call `withLog "addFile"` after.
+
+- [ ] **Step 2: Implement `getFile`**
+
+  For `SFSender`: `SELECT ... FROM files WHERE sender_id = ?`. Construct `FileRec` with `newTVarIO` per TVar field. `recipientIds = S.empty`.
+  For `SFRecipient`: `SELECT f.*, r.recipient_key FROM recipients r JOIN files f ON r.sender_id = f.sender_id WHERE r.recipient_id = ?`.
+
+- [ ] **Step 3: Implement `setFilePath`**
+
+  `UPDATE files SET file_path = ? WHERE sender_id = ? AND file_path IS NULL`. Use `assertUpdated`. Call `withLog "setFilePath"`.
+
+- [ ] **Step 4: Implement `addRecipient`**
+
+  `INSERT INTO recipients (recipient_id, sender_id, recipient_key) VALUES (?,?,?)`. `handleDuplicate` → `DUPLICATE_`. Call `withLog "addRecipient"`.
+
+- [ ] **Step 5: Implement `deleteFile`, `blockFile`**
+
+  `deleteFile`: `DELETE FROM files WHERE sender_id = ?` (CASCADE). `withLog "deleteFile"`.
+  `blockFile`: `UPDATE files SET status = ? WHERE sender_id = ?`. `assertUpdated`. `withLog "blockFile"`.
+
+- [ ] **Step 6: Implement `deleteRecipient`, `ackFile`**
+
+  `deleteRecipient`: `DELETE FROM recipients WHERE recipient_id = ?`. `withLog "deleteRecipient"`.
+  `ackFile`: same + return `Left AUTH` if 0 rows.
+
+- [ ] **Step 7: Implement `expiredFiles`, `getUsedStorage`, `getFileCount`**
+
+  `expiredFiles`: `SELECT sender_id, file_path, file_size FROM files WHERE created_at + ? < ? LIMIT ?`.
+  `getUsedStorage`: `SELECT COALESCE(SUM(file_size), 0) FROM files`.
+  `getFileCount`: `SELECT COUNT(*) FROM files`.
+
+- [ ] **Step 8: Add `ToField`/`FromField` instances**
+
+  For `RoundedFileTime` (Int64 wrapper), `ServerEntityStatus` (Text via StrEncoding), `C.APublicAuthKey` (Binary via `encodePubKey`/`decodePubKey`). Check SMP's `QueueStore/Postgres.hs` for existing instances to import.
+
+- [ ] **Step 9: Wrap mutation operations in `uninterruptibleMask_`**
+
+  Operations that combine a DB write with a TVar update (e.g., `getFile` constructs `FileRec` with `newTVarIO`) must be wrapped in `E.uninterruptibleMask_` to prevent async exceptions from leaving inconsistent state. Follow SMP's `addQueue_`, `deleteStoreQueue` pattern.
+
+- [ ] **Step 10: Build**
+
+  Run: `cabal build -fserver_postgres`
+
+- [ ] **Step 11: Format and commit**
+
+  ```bash
+  fourmolu -i src/Simplex/FileTransfer/Server/Store/Postgres.hs
+  git add src/Simplex/FileTransfer/Server/Store/Postgres.hs
+  git commit -m "feat(xftp): implement PostgresFileStore operations"
+  ```
+
+---
+
+## Task 8: Add INI config, Main.hs dispatch, startup validation
+
+**Files:**
+- Modify: `src/Simplex/FileTransfer/Server/Main.hs`
+- Modify: `src/Simplex/FileTransfer/Server/Env.hs`
+
+- [ ] **Step 1: Update `iniFileContent` in `Main.hs`**
+
+  Add to `[STORE_LOG]` section: `store_files: memory`, commented-out `db_connection`, `db_schema`, `db_pool_size`, `db_store_log` keys. Follow SMP's `optDisabled'` pattern for commented defaults.
+
+- [ ] **Step 2: Add `StartOptions` and `--confirm-migrations` flag**
+
+  ```haskell
+  data StartOptions = StartOptions
+    { confirmMigrations :: MigrationConfirmation
+    }
+  ```
+  Add to `Start` command parser with default `MCConsole`. Thread through to `runServer`.
+
+- [ ] **Step 3: Add store_files INI parsing and CPP-guarded Postgres dispatch**
+
+  In `runServer`: read `store_files` from INI (`fromRight "memory" $ lookupValue "STORE_LOG" "store_files" ini`). Add `"database"` branch (CPP-guarded) that constructs `PostgresFileStoreCfg` using `iniDBOptions ini defaultXFTPDBOpts` and `enableDbStoreLog'` pattern. Non-postgres build: `exitError`.
+
+- [ ] **Step 4: Add `XSCDatabase` branch in `newXFTPServerEnv` (`Env.hs`)**
+
+  CPP-guarded pattern match on `XSCDatabase dbCfg`: `newFileStore dbCfg`, `storeLog = Nothing`.
+
+- [ ] **Step 5: Add startup config validation**
+
+  Add `checkFileStoreMode` (CPP-guarded) before `run`: validate conflicting storeLog file + database mode, missing schema, etc. per design doc.
+
+- [ ] **Step 6: Build both ways**
+
+  Run: `cabal build && cabal build -fserver_postgres`
+
+- [ ] **Step 7: Format and commit**
+
+  ```bash
+  fourmolu -i src/Simplex/FileTransfer/Server/Main.hs src/Simplex/FileTransfer/Server/Env.hs
+  git add src/Simplex/FileTransfer/Server/Main.hs src/Simplex/FileTransfer/Server/Env.hs
+  git commit -m "feat(xftp): add PostgreSQL INI config, store dispatch, startup validation"
+  ```
+
+---
+
+## Task 9: Add database import/export CLI commands
+
+**Files:**
+- Modify: `src/Simplex/FileTransfer/Server/Main.hs`
+
+- [ ] **Step 1: Add `Database` CLI command (CPP-guarded)**
+
+  Add `Database StoreCmd DBOpts` constructor to `CliCommand`. Add `database` subcommand parser with `import`/`export` subcommands + `dbOptsP defaultXFTPDBOpts`.
+
+- [ ] **Step 2: Implement `importFileStoreToDatabase`**
+
+  1. `confirmOrExit` with database details.
+  2. Create temporary `STMFileStore`, replay StoreLog via `readWriteFileStore`.
+  3. Create `PostgresFileStore` with `createSchema = True`, `confirmMigrations = MCYesUp`.
+  4. Batch-insert files using PostgreSQL COPY protocol. Progress every 10k.
+  5. Batch-insert recipients using COPY protocol.
+  6. Verify counts: `SELECT COUNT(*)` — warn on mismatch.
+  7. Rename StoreLog to `.bak`.
+  8. Report counts.
+
+- [ ] **Step 3: Implement `exportDatabaseToStoreLog`**
+
+  1. `confirmOrExit`. Fail if output file exists.
+  2. Create `PostgresFileStore` from config.
+  3. Open StoreLog for writing.
+  4. Fold over file records: write `AddFile` (with status), `AddRecipients`, `PutFile` per file.
+  5. Close StoreLog, report counts.
+
+- [ ] **Step 4: Build**
+
+  Run: `cabal build -fserver_postgres`
+
+- [ ] **Step 5: Format and commit**
+
+  ```bash
+  fourmolu -i src/Simplex/FileTransfer/Server/Main.hs
+  git add src/Simplex/FileTransfer/Server/Main.hs
+  git commit -m "feat(xftp): add database import/export CLI commands"
+  ```
+
+---
+
+## Task 10: Add Postgres tests
+
+**Files:**
+- Modify: `tests/XFTPClient.hs`
+- Modify: `tests/Test.hs`
+- Create: `tests/CoreTests/XFTPStoreTests.hs`
+
+- [ ] **Step 1: Add test fixtures in `tests/XFTPClient.hs`**
+
+  ```haskell
+  testXFTPStoreDBOpts :: DBOpts
+  testXFTPStoreDBOpts =
+    DBOpts
+      { connstr = "postgresql://test_xftp_server_user@/test_xftp_server_db",
+        schema = "xftp_server_test",
+        poolSize = 10,
+        createSchema = True
+      }
+  ```
+  Add `testXFTPDBConnectInfo :: ConnectInfo` matching the connection string.
+
+- [ ] **Step 2: Add Postgres server test group in `tests/Test.hs`**
+
+  CPP-guarded block that runs existing `xftpServerTests` with Postgres store config, wrapped in `postgressBracket testXFTPDBConnectInfo`. Parameterize `withXFTPServer` to accept store config if needed.
+
+- [ ] **Step 3: Create `tests/CoreTests/XFTPStoreTests.hs` — unit tests**
+
+  Test `PostgresFileStore` operations directly:
+  - `addFile` + `getFile SFSender` round-trip.
+  - `addFile` duplicate → `DUPLICATE_`.
+  - `getFile` nonexistent → `AUTH`.
+  - `setFilePath` + verify `WHERE file_path IS NULL` guard.
+  - `addRecipient` + `getFile SFRecipient` round-trip.
+  - `deleteFile` cascades recipients.
+  - `blockFile` + verify status.
+  - `expiredFiles` batch semantics.
+  - `getUsedStorage`, `getFileCount` correctness.
+
+- [ ] **Step 4: Add migration round-trip test**
+
+  Create `STMFileStore` with test data (files + recipients + blocked status) → export to StoreLog → import to Postgres → export back → compare StoreLog files byte-for-byte.
+
+- [ ] **Step 5: Build and run tests**
+
+  ```bash
+  cabal build -fserver_postgres test:simplexmq-test
+  cabal test --test-show-details=streaming --test-option=--match="/XFTP/" -fserver_postgres
+  ```
+
+- [ ] **Step 6: Format and commit**
+
+  ```bash
+  fourmolu -i tests/CoreTests/XFTPStoreTests.hs tests/XFTPClient.hs
+  git add tests/CoreTests/XFTPStoreTests.hs tests/XFTPClient.hs tests/Test.hs
+  git commit -m "test(xftp): add PostgreSQL backend tests"
+  ```

plans/2026-06-01-bbs-bindings.md

@@ -0,0 +1,126 @@
+# BBS+ Bindings for simplexmq
+
+Haskell FFI bindings to libbbs for BBS+ signatures. General-purpose - the module knows nothing about specific applications.
+
+## How BBS+ works
+
+BBS+ signs a fixed list of N messages. Each message is an arbitrary byte array. The signer signs all N messages at once with one signature.
+
+The holder of the signature can then generate a proof that selectively discloses some messages and hides others. The verifier learns the disclosed messages and confirms they were signed by the signer, but learns nothing about the hidden messages. Different proofs from the same signature are unlinkable.
+
+Key constraint: the total number of messages N is fixed at signing time. The verifier must know N. A proof generated from a 3-message signature cannot be verified as a 2-message proof.
+
+## Types
+
+```haskell
+newtype BBSSecretKey = BBSSecretKey ByteString  -- 32 bytes
+newtype BBSPublicKey = BBSPublicKey ByteString  -- 96 bytes (BLS12-381 G2 point)
+newtype BBSSignature = BBSSignature ByteString  -- 80 bytes
+newtype BBSProof = BBSProof ByteString          -- 272 + 32 * numUndisclosed bytes
+newtype BBSHeader = BBSHeader ByteString        -- always-disclosed context (e.g. protocol identifier)
+newtype BBSPresHeader = BBSPresHeader ByteString -- random nonce for proof unlinkability
+```
+
+All newtypes get StrEncoding (base64url), ToJSON/FromJSON (via strToJSON/strParseJSON), Eq, Show.
+
+## Functions
+
+```haskell
+bbsKeyGen :: IO (Either String BBSKeyPair)  -- BBSKeyPair = (BBSPublicKey, BBSSecretKey)
+
+-- pk is derived from sk internally, so it is not a parameter
+bbsSign
+  :: BBSSecretKey
+  -> BBSHeader            -- always-disclosed context
+  -> [ByteString]         -- all N messages
+  -> IO (Either String BBSSignature)
+
+-- C order: pk, signature, header, presentation_header, disclosed_indexes, messages
+bbsProofGen
+  :: BBSPublicKey
+  -> BBSSignature
+  -> BBSHeader            -- must match what was signed
+  -> BBSPresHeader        -- random nonce bound into the proof
+  -> [Int]                -- disclosed indexes (0-based)
+  -> [ByteString]         -- all N messages (needed internally, hidden ones not revealed in proof)
+  -> IO (Either String BBSProof)
+
+-- C order: pk, proof, header, presentation_header, disclosed_indexes, n, messages
+bbsProofVerify
+  :: BBSPublicKey
+  -> BBSProof
+  -> BBSHeader            -- must match what was signed
+  -> BBSPresHeader        -- must match what was used in bbsProofGen
+  -> [Int]                -- disclosed indexes
+  -> Int                  -- total message count N
+  -> [ByteString]         -- disclosed messages only
+  -> IO Bool
+```
+
+## How applications use it
+
+An application defines:
+- A message layout: which index means what
+- Which indexes are disclosed vs hidden
+- How to encode application values as ByteString messages
+
+### Badge example (in simplex-chat, not in this module)
+
+Message layout (always 3 messages):
+- Index 0: master secret (32 random bytes) - HIDDEN
+- Index 1: expiry (UTF-8 encoded timestamp string) - DISCLOSED
+- Index 2: badge type (UTF-8 encoded, e.g. "supporter") - DISCLOSED
+
+Signing (v2, on the server):
+```
+bbsSign sk header [ms, encodeUtf8 "2026-07-31", encodeUtf8 "supporter"]
+```
+
+Proof generation (v2, on the client):
+```
+bbsProofGen pk sig header presHeader [1, 2] [ms, encodeUtf8 "2026-07-31", encodeUtf8 "supporter"]
+```
+
+Proof verification (v1, on the recipient):
+```
+bbsProofVerify pk proof header presHeader 3 [1, 2] [encodeUtf8 "2026-07-31", encodeUtf8 "supporter"]
+```
+
+The recipient only sees the proof, presentationHeader, expiry string, and badge type string. They verify these were signed by the server (pk is hardcoded). They never see the master secret.
+
+Expiry is always present as a string. Monthly badges use a date like `"2026-07-31"`, lifetime badges use `"lifetime"`. BBS+ doesn't interpret the bytes - expiry semantics are the application's responsibility. This keeps the message count fixed at 3 for all badge types.
+
+## libbbs C API mapping
+
+```c
+int bbs_keygen_full(ciphersuite, sk, pk)
+int bbs_sign(ciphersuite, sk, pk, signature, header, header_len, n, messages, message_lens)
+int bbs_proof_gen(ciphersuite, pk, signature, proof, header, header_len, presentation_header, presentation_header_len, disclosed_indexes, disclosed_indexes_len, n, messages, message_lens)
+int bbs_proof_verify(ciphersuite, pk, proof, proof_len, header, header_len, presentation_header, presentation_header_len, disclosed_indexes, disclosed_indexes_len, n, messages, message_lens)
+```
+
+We use `bbs_sha256_ciphersuite`. The header parameter is exposed in all Haskell functions - the application decides what to put there. Tests use `"SimpleX"` as header.
+
+The `presentation_header` parameter is what we call `presentationHeader`.
+
+In `bbs_proof_verify`, the `n` parameter is the total number of messages (not the number of disclosed messages). The `messages` array contains only the disclosed messages, and `disclosed_indexes` maps each to its position in the original message list.
+
+## Build
+
+Submodules in cbits/:
+- `cbits/libbbs` - https://github.com/Fraunhofer-AISEC/libbbs
+- `cbits/blst` - https://github.com/supranational/blst (libbbs dependency)
+
+C sources in cabal: `cbits/blst/src/server.c`, `cbits/blst/build/assembly.S`, libbbs source files.
+Include dirs: `cbits/blst/bindings/`, `cbits/blst/src/`, `cbits/libbbs/include/`, `cbits/libbbs/src/`.
+C flags: `-D__BLST_PORTABLE__` for cross-CPU-generation compatibility.
+
+## Tests
+
+- Keygen produces keys of correct size
+- Sign + proofGen + proofVerify roundtrip succeeds
+- Tampered proof fails verification
+- Tampered disclosed message fails verification
+- Wrong public key fails verification
+- Two proofs from same credential with different nonces both verify
+- Proof size matches expected (272 + 32 * numUndisclosed)

plans/2026-06-27-service-subscriptions-memory-leak.md

@@ -0,0 +1,57 @@
+## Root cause: orphaned `Sub` entries in the service client's `subscriptions` map
+
+**The leak is service-specific and was introduced by PR #1667 "messaging services" (`f0b7a4be`).** A long-lived messaging-service connection accumulates per-queue `Sub` records in its `Client.subscriptions` map that are **never removed** when the associated queues are deleted or unassociated — only the counter is decremented. Over normal queue churn the map grows monotonically for the entire lifetime of the service connection.
+
+### The proof — an asymmetry between two handlers in `serverThread`
+
+Both individual queue subscriptions and service subscriptions store a `Sub` per queue in `Client.subscriptions` (= `clientSubs` for the SMP subscriber thread, wired at `Server.hs:189`). When a queue ends/is deleted, the two paths diverge:
+
+**Individual subscriber — entry IS removed** (`Server.hs:332`, `346`):
+```haskell
+CSAEndSub qId -> atomically (endSub c qId) >>= a unsub_   -- :332
+  ...
+endSub c qId = TM.lookupDelete qId (clientSubs c) >>= (removeWhenNoSubs c $>)  -- :346
+```
+
+**Service subscriber — entry is NOT removed** (`Server.hs:336-340`):
+```haskell
+CSAEndServiceSub qId -> atomically $ do
+  modifyTVar' (clientServiceSubs c) decrease   -- decrements serviceSubsCount
+  modifyTVar' totalServiceSubs decrease        -- decrements global count
+  where decrease = subtractServiceSubs (1, queueIdHash qId)
+  -- never touches (clientSubs c) — the Sub for qId stays forever
+```
+
+### Where the orphaned entries are added (both new in this PR)
+- `Server.hs:1860-1862` — on service subscribe (`SSUB`), one `Sub` inserted per queue that has a pending message.
+- `Server.hs:2039-2043` (`newServiceDeliverySub`) — on **every** `SEND` to a service-associated queue with no existing sub, a `Sub` is inserted into the service client's `subscriptions`. After delivery the thread state resets to `NoSub` (`:2069`) but the map entry remains as a "already delivering" marker (`:1856-1859`).
+
+### Why they leak
+The only places the service client's `subscriptions` map is cleared are:
+- `clientDisconnected` — `swapTVar subscriptions M.empty` (`Server.hs:1097`) — only on disconnect.
+- `CSADecreaseSubs` — `swapTVar (clientSubs c) M.empty` (`Server.hs:343`) — only on full service takeover by another connection.
+- `delQueueAndMsgs` — `TM.lookupDelete entId $ subscriptions clnt` (`Server.hs:2164`) — but `clnt` here is **the recipient deleting its own queue, not the service client**. The service's entry for that queue is reached only via the `CSDeleted → endServiceSub → CSAEndServiceSub` path (`Server.hs:306, 313, 336`), which decrements the counter but leaves the map entry.
+
+**Concrete scenario (fully traced):** Service `S` subscribes (`SSUB`) and stays connected for days. Recipient `R` owns service-associated queue `Q`. A `SEND` to `Q` inserts a `Sub` into `S.subscriptions[Q]` (`:2042`). `R` later deletes `Q` → `delQueueAndMsgs` runs on `R`'s connection, removes `Q` from `R.subscriptions`, decrements counters, enqueues `CSDeleted Q (Just S)` (`:2167`) → `serverThread` runs `CSAEndServiceSub Q` for `S` (`:336`), decrementing `S.serviceSubsCount` but **leaving `S.subscriptions[Q]` in place**. Net: one orphaned `Sub` (record + 2 TVars) per service-associated queue ever deleted/unassociated, never reclaimed until `S` disconnects. The logical counter `serviceSubsCount` correctly drops, so the map size diverges from the counter — making the leak invisible to the existing service-sub metric.
+
+### Verdict
+This is a deterministic, static-provable memory leak — no production logging needed to confirm the existence; the asymmetry between `CSAEndSub` (removes) and `CSAEndServiceSub` (doesn't) is the smoking gun. It is specific to messaging-service certificate clients, which is exactly the population added by the services/certificate PR.
+
+### Secondary findings (lower impact, same PR area, not the primary cause)
+- **`forkClient` register-after-fork race** (`Server.hs:1356-1359`): if the forked action's `finally` delete (`:1358`) runs before the parent's `IM.insert` (`:1359`), a `Weak ThreadId` of a dead thread is left in `endThreads` until disconnect. Pre-existing, tiny per-entry, but exercised far more by the PR's higher END/DELD volume.
+- **Wrong-client counter decrement** (`Server.hs:2166`): `delQueueAndMsgs` decrements `serviceSubsCount` of the *deleting* client, not the service; harmless for non-service deleters (floored at 0) but corrupts accounting if a service deletes its own queue.
+
+---
+
+### Recommended fix (mirror `endSub` in the service path)
+Make `CSAEndServiceSub` also delete the per-queue `Sub` and cancel its delivery thread, exactly as `CSAEndSub`/`endSub` do for individual subscribers. Roughly:
+
+```haskell
+CSAEndServiceSub qId -> do
+  s_ <- atomically $ do
+    modifyTVar' (clientServiceSubs c) decrease
+    modifyTVar' totalServiceSubs decrease
+    TM.lookupDelete qId (clientSubs c) <* removeWhenNoSubs c
+  forM_ unsub_ $ \unsub -> mapM_ unsub s_
+  where decrease = subtractServiceSubs (1, queueIdHash qId)
+```

plans/20260328_01_server_batched_sub_processing.md

@@ -0,0 +1,152 @@
+# Server: batched SUB command processing
+
+Implementation plan for Part 1 of [RFC 2026-03-28-subscription-performance](../rfcs/2026-03-28-subscription-performance.md).
+
+## Current state
+
+When a batch of ~135 SUB commands arrives, the server already batches:
+- Queue record lookups (`getQueueRecs` in `receive`, Server.hs:1151)
+- Command verification (`verifyLoadedQueue`, Server.hs:1152)
+
+But command processing is per-command (`foldrM process` in `client`, Server.hs:1372-1375). Each SUB calls `subscribeQueueAndDeliver` which calls `tryPeekMsg` - one DB query per queue. For Postgres, that's ~135 individual `SELECT ... FROM messages WHERE recipient_id = ? ORDER BY message_id ASC LIMIT 1` queries per batch.
+
+## Goal
+
+Replace ~135 individual message peek queries with 1 batched query per batch. No protocol changes.
+
+## Implementation
+
+### Step 1: Add `tryPeekMsgs` to MsgStoreClass
+
+File: `src/Simplex/Messaging/Server/MsgStore/Types.hs`
+
+Add to `MsgStoreClass`:
+
+```haskell
+tryPeekMsgs :: s -> [StoreQueue s] -> ExceptT ErrorType IO (Map RecipientId Message)
+```
+
+Returns a map from recipient ID to earliest pending message for each queue that has one. Queues with no messages are absent from the map.
+
+### Step 2: Parameterize `deliver` to accept pre-fetched message
+
+File: `src/Simplex/Messaging/Server.hs`
+
+Currently `deliver` (inside `subscribeQueueAndDeliver`, line 1641) calls `tryPeekMsg ms q`. Add a parameter for an optional pre-fetched message:
+
+```haskell
+deliver :: Maybe Message -> (Bool, Maybe Sub) -> M s ResponseAndMessage
+deliver prefetchedMsg (hasSub, sub_) = do
+  stats <- asks serverStats
+  fmap (either ((,Nothing) . err) id) $ liftIO $ runExceptT $ do
+    msg_ <- maybe (tryPeekMsg ms q) (pure . Just) prefetchedMsg
+    ...
+```
+
+When `Nothing` is passed, falls back to individual `tryPeekMsg` (existing behavior). When `Just msg` is passed, uses it directly (batched path).
+
+### Step 3: Pre-fetch messages before the processing loop
+
+File: `src/Simplex/Messaging/Server.hs`
+
+Currently (lines 1372-1375):
+
+```haskell
+forever $
+  atomically (readTBQueue rcvQ)
+    >>= foldrM process ([], [])
+    >>= \(rs_, msgs) -> ...
+```
+
+Add a pre-fetch step before the existing loop:
+
+```haskell
+forever $ do
+  batch <- atomically (readTBQueue rcvQ)
+  msgMap <- prefetchMsgs batch
+  foldrM (process msgMap) ([], []) batch
+    >>= \(rs_, msgs) -> ...
+```
+
+`prefetchMsgs` scans the batch, collects queues from SUB commands that have a verified queue (`q_ = Just (q, _)`), calls `tryPeekMsgs` once, returns the map. For batches with no SUBs it returns an empty map (no DB call).
+
+`process` passes the looked-up message (or Nothing) through to `processCommand` and down to `deliver`.
+
+The `foldrM process` loop, `processCommand`, `subscribeQueueAndDeliver`, and all other command handlers stay structurally the same. Only `deliver` gains one parameter, and the `client` loop gains one pre-fetch call.
+
+### Step 4: Review
+
+Review the typeclass signature and server usage. Confirm the interface has the right shape before implementing store backends.
+
+### Step 5: Implement for each store backend
+
+#### Postgres
+
+File: `src/Simplex/Messaging/Server/MsgStore/Postgres.hs`
+
+Single query using `DISTINCT ON`:
+
+```sql
+SELECT DISTINCT ON (recipient_id)
+  recipient_id, msg_id, msg_ts, msg_quota, msg_ntf_flag, msg_body
+FROM messages
+WHERE recipient_id IN ?
+ORDER BY recipient_id, message_id ASC
+```
+
+Build `Map RecipientId Message` from results.
+
+#### STM
+
+File: `src/Simplex/Messaging/Server/MsgStore/STM.hs`
+
+Loop over queues, call `tryPeekMsg` for each, collect into map.
+
+#### Journal
+
+File: `src/Simplex/Messaging/Server/MsgStore/Journal.hs`
+
+Loop over queues, call `tryPeekMsg` for each, collect into map.
+
+### Step 6: Handle edge cases
+
+1. **Mixed batches**: `prefetchMsgs` collects only SUB queues. Non-SUB commands get Nothing for the pre-fetched message and process unchanged.
+
+2. **Already-subscribed queues**: Include in pre-fetch - `deliver` is called for re-SUBs too (delivers pending message).
+
+3. **Service subscriptions**: The pre-fetch doesn't care about service state. `sharedSubscribeQueue` handles service association in STM; message peek is the same.
+
+4. **Error queues**: Verification errors from `receive` are Left values in the batch. `prefetchMsgs` only looks at Right values with SUB commands.
+
+5. **Empty pre-fetch**: If batch has no SUBs (e.g., all ACKs), `prefetchMsgs` returns empty map, no DB call made.
+
+### Step 7: Batch other commands (future, not in scope)
+
+The same pattern (pre-fetch before loop, parameterize handler) can extend to:
+- `ACK` with `tryDelPeekMsg` - batch delete+peek
+- `GET` with `tryPeekMsg` - same map lookup
+
+Lower priority since these don't have the N-at-once pattern of subscriptions.
+
+## File changes summary
+
+| File | Change |
+|---|---|
+| `src/Simplex/Messaging/Server/MsgStore/Types.hs` | Add `tryPeekMsgs` to typeclass |
+| `src/Simplex/Messaging/Server/MsgStore/Postgres.hs` | Implement `tryPeekMsgs` with batch SQL |
+| `src/Simplex/Messaging/Server/MsgStore/STM.hs` | Implement `tryPeekMsgs` as loop |
+| `src/Simplex/Messaging/Server/MsgStore/Journal.hs` | Implement `tryPeekMsgs` as loop |
+| `src/Simplex/Messaging/Server.hs` | Add `prefetchMsgs`, parameterize `deliver` |
+
+## Testing
+
+1. Existing server tests must pass unchanged (correctness preserved).
+2. Add a test that subscribes a batch of queues (some with pending messages, some without) and verifies all get correct SOK + MSG responses.
+3. Prometheus metrics: existing `qSub` stat should still increment correctly.
+
+## Performance expectation
+
+For 300K queues across ~2200 batches:
+- Before: ~300K individual DB queries
+- After: ~2200 batched DB queries (one per batch of ~135)
+- ~136x reduction in DB round-trips

plans/20260401_01_batch_queue_associations.md

@@ -0,0 +1,126 @@
+# Server: batch queue service associations
+
+When a batch of SUB or NSUB commands arrives from a service client, each command that needs a new or removed service association calls `setQueueService` individually - one DB write per command. For 135 commands per batch, that's 135 individual `UPDATE msg_queues` queries.
+
+## Goal
+
+Reduce to at most 2 DB queries per batch (one for rcv associations, one for ntf associations), using `UPDATE ... RETURNING recipient_id` to identify which queues were actually updated.
+
+Also fuse message pre-fetch and association batching into a single batch preparation step with a clean contract.
+
+## Contract
+
+```haskell
+prepareBatch :: Maybe ServiceId -> NonEmpty (VerifiedTransmission s) -> M s (Either ErrorType (Map RecipientId (Maybe Message, Maybe (Either ErrorType ()))))
+```
+
+`Left e` = batch-level failure (message pre-fetch or association query failed entirely). All SUBs/NSUBs in the batch get this error.
+
+`Right map` = per-queue results as a tuple:
+- `Maybe Message` - pre-fetched message for SUB queues, `Nothing` for NSUB or no message
+- `Maybe (Either ErrorType ())` - association result. `Nothing` = no update needed. `Just (Right ())` = update succeeded. `Just (Left e)` = update failed for this queue.
+
+One map, one lookup per queue. `processCommand` passes both values to `subscribeQueueAndDeliver` / `subscribeNotifications` -> `sharedSubscribeQueue`.
+
+Queues not in the map (non-SUB/NSUB commands, failed verification) are not affected.
+
+## prepareBatch implementation
+
+One accumulating fold over the batch, collecting three lists:
+- `subMsgQs :: [StoreQueue s]` - SUB queues for message pre-fetch
+- `rcvAssocQs :: [StoreQueue s]` - SUB queues needing `rcv_service_id` update (`clntServiceId /= rcvServiceId qr`)
+- `ntfAssocQs :: [StoreQueue s]` - NSUB queues needing `ntf_service_id` update (`clntServiceId /= ntfServiceId` from `NtfCreds`)
+
+Classification reads from the already-loaded `QueueRec` in `VerifiedTransmission` - no extra DB query.
+
+Then three store calls (each skipped if its list is empty):
+1. `tryPeekMsgs ms subMsgQs` -> `Map RecipientId Message`
+2. `setRcvQueueServices (queueStore ms) clntServiceId rcvAssocQs` -> `Set RecipientId`
+3. `setNtfQueueServices (queueStore ms) clntServiceId ntfAssocQs` -> `Set RecipientId`
+
+Then one pass to merge results into `Map RecipientId (Maybe Message, Maybe (Either ErrorType ()))`:
+- For each SUB queue: `(M.lookup rId msgMap, assocResult rId rcvUpdated rcvAssocQs)`
+- For each NSUB queue: `(Nothing, assocResult rId ntfUpdated ntfAssocQs)`
+
+Where `assocResult rId updated assocQs` = if the queue was in `assocQs` (needed update), then `Just (Right ())` if `rId` is in `updated`, else `Just (Left AUTH)`. If not in `assocQs` (no update needed), `Nothing`.
+
+If any of the three calls fails entirely, return `Left e`.
+
+## Store interface
+
+Replace the polymorphic `setQueueServices` with two plain functions in `QueueStoreClass`:
+
+```haskell
+setRcvQueueServices :: s -> Maybe ServiceId -> [q] -> IO (Set RecipientId)
+setNtfQueueServices :: s -> Maybe ServiceId -> [q] -> IO (Set RecipientId)
+```
+
+No `SParty p` polymorphism. Each function knows its column.
+
+### Postgres implementation
+
+`setRcvQueueServices`:
+```sql
+UPDATE msg_queues SET rcv_service_id = ?
+WHERE recipient_id IN ? AND deleted_at IS NULL
+RETURNING recipient_id
+```
+
+`setNtfQueueServices`:
+```sql
+UPDATE msg_queues SET ntf_service_id = ?
+WHERE recipient_id IN ? AND notifier_id IS NOT NULL AND deleted_at IS NULL
+RETURNING recipient_id
+```
+
+After each batch query, for each queue in the returned set:
+1. Read QueueRec TVar, update with new serviceId
+2. Write store log entry
+
+### STM implementation
+
+Loop over queues, call existing per-item logic, collect succeeded `RecipientId`s into a Set.
+
+## Downstream changes in Server.hs
+
+### processCommand
+
+Gains one parameter: `Map RecipientId (Maybe Message, Maybe (Either ErrorType ()))`.
+
+SUB case: `M.lookup entId prepared` gives `Just (msg_, assocResult)` or `Nothing`. Pass both to `subscribeQueueAndDeliver`.
+
+NSUB case: `M.lookup entId prepared` gives `Just (Nothing, assocResult)` or `Nothing`. Pass `assocResult` to `subscribeNotifications`.
+
+Forwarded commands: pass `M.empty`.
+
+### subscribeQueueAndDeliver
+
+Takes `Maybe Message` and `Maybe (Either ErrorType ())` as before. No change in how it uses them.
+
+### sharedSubscribeQueue
+
+Takes `Maybe (Either ErrorType ())`. On paths needing association update:
+- `Just (Left e)` -> return error
+- `Just (Right ())` -> skip `setQueueService`, proceed with STM work
+- `Nothing` -> no update needed, proceed with existing logic
+
+## Implementation order (top-down)
+
+1. Define the `prepareBatch` contract and thread one map through `processCommand` -> `subscribeQueueAndDeliver` / `subscribeNotifications` -> `sharedSubscribeQueue` (Server.hs)
+2. Implement `prepareBatch` with the fold, three calls, and merge (Server.hs)
+3. Add `setRcvQueueServices` and `setNtfQueueServices` to `QueueStoreClass` (Types.hs)
+4. Implement for Postgres with batch `UPDATE ... RETURNING` (Postgres.hs)
+5. Implement for STM as loop (STM.hs)
+6. Implement for Journal as delegation (Journal.hs)
+
+At step 2, store functions can initially be stubs returning empty sets. Steps 3-6 fill in the real implementations.
+
+## Files changed
+
+| File | Change |
+|---|---|
+| `src/Simplex/Messaging/Server.hs` | `prepareBatch` with fold + merge; one map parameter through `processCommand` -> `subscribeQueueAndDeliver` / `subscribeNotifications` -> `sharedSubscribeQueue` |
+| `src/Simplex/Messaging/Server/QueueStore/Types.hs` | Add `setRcvQueueServices`, `setNtfQueueServices` to `QueueStoreClass` |
+| `src/Simplex/Messaging/Server/QueueStore/Postgres.hs` | Implement with batch `UPDATE ... RETURNING` + per-item TVar/log updates |
+| `src/Simplex/Messaging/Server/QueueStore/STM.hs` | Implement as loop |
+| `src/Simplex/Messaging/Server/MsgStore/Journal.hs` | Delegate to underlying store |

plans/20260522_01_smp_public_namespaces.md

@@ -0,0 +1,455 @@
+# Server: SMP support for public namespaces
+
+> **⚠ Implementation diverged from this plan.** Six audit rounds reshaped the
+> original design. **The shipped code differs in several load-bearing ways:**
+>
+> - **Wire format**: `NameRecord` is now JSON (aeson), not the custom binary
+>   ABNF this plan documents. See `protocol/simplex-messaging.md` §Resolver
+>   commands and `src/Simplex/Messaging/Protocol.hs` ToJSON/FromJSON instances.
+> - **No cache**: the TTL + FIFO + byte-cap cache, in-flight coalescing,
+>   `psqueues` dep, and `cache_*` INI keys are all gone. Every RSLV becomes
+>   one `eth_call` bounded by `rpcMaxConcurrency` + `rpcTimeoutMs`. See
+>   `src/Simplex/Messaging/Server/Names.hs`.
+> - **No `allow_dangerous_colocation` flag**: the proxy co-location guard
+>   was demoted to a startup `logWarn` (the flag was always-on because
+>   `[PROXY]` has no enable toggle).
+> - **Module shape**: `Names/Resolver.hs` was merged into `Names.hs`; only
+>   `Names/Eth/RPC.hs` and `Names/Eth/SNRC.hs` remain as separate modules.
+> - **Test list**: of the 15 specs listed below, ~7 shipped; the rest were
+>   either superseded by the cache removal (CacheSpec) or deferred
+>   (ForwardedRslvSpec, MockRpcSpec, StartupGuardSpec, UrlValidationSpec,
+>   EipChecksumSpec).
+>
+> Sources of truth: `CHANGELOG.md` (release notes),
+> `protocol/simplex-messaging.md` §Resolver commands (wire format),
+> `src/Simplex/Messaging/Server/Names*.hs` (implementation). This file is
+> retained as historical context; do not treat it as a specification.
+
+Implementation plan for Part 2 of [RFC 2026-05-21-public-namespaces](https://github.com/simplex-chat/simplex-chat/blob/ep/namespace/docs/rfcs/2026-05-21-public-namespaces.md). Adds a forwarded-only `RSLV <lookup_key>` SMP command that returns `NAME <NameRecord>` read from the SNRC contract via a Reth+Nimbus JSON-RPC endpoint. Smp-server becomes name-capable by `[NAMES] enable: on`.
+
+Out of scope: `Simplex.Messaging.Client` API, agent-side resolution flow, `ServerRoles.names` in the agent, default-router list, reverse resolution, multicoin/text records, state proofs.
+
+## Architecture
+
+```mermaid
+sequenceDiagram
+  participant C as Client
+  participant P as Proxy (storage role)
+  participant N as Name server (names role)
+  participant E as Ethereum endpoint<br/>(Reth+Nimbus)
+
+  C ->> P: PFWD(enc(RSLV key))
+  P ->> N: RFWD(enc(RSLV key))
+  note over N: verifyTransmission True →<br/>vc SResolver (RSLV _) → VRVerified
+  N ->> N: cache lookup
+  alt cache miss
+    N ->> E: eth_call(SNRC, namehash(key))
+    E -->> N: ABI bytes
+    note over N: ABI decode + zero-owner check + cache insert
+  end
+  N -->> P: RFWD(enc(NAME rec | ERR AUTH))
+  P -->> C: PRES(enc(NAME rec | ERR AUTH))
+```
+
+RSLV is **forwarded-only** — direct RSLV is rejected `CMD PROHIBITED`. This preserves the RFC's two-server resolution: the name server sees the lookup key but never the client's IP, session, or identity.
+
+## Protocol
+
+Shared library: `src/Simplex/Messaging/Protocol.hs` and `src/Simplex/Messaging/Transport.hs`.
+
+**Version.** `Transport.hs:226`: `namesSMPVersion = VersionSMP 20`. Bump `currentClientSMPRelayVersion`, `currentServerSMPRelayVersion`, `proxiedSMPRelayVersion` to 20. Pre-v20 binaries lack the `RSLV_` tag; v20 binaries with sessions negotiated at v < 20 reject `RSLV_` at the parameter parser. The proxied-version bump 18 → 20 is safe (v19's `RecipientService`/`NotifierService` aren't in the forwarded whitelist; v18's `BLOCKED info` is already version-branched at `Protocol.hs:1943`).
+
+**Party kind.** Append `Resolver` to `Party` (line 335); add `SResolver` (line 349), `TestEquality` clause (line 361), `PartyI Resolver` (line 394). `queueParty SResolver = Nothing` (falls through line 412). `partyClientRole SResolver = Nothing`.
+
+**`RSLV` command.**
+
+```haskell
+RSLV :: LookupKey -> Command Resolver
+newtype LookupKey = LookupKey ByteString
+
+instance Encoding LookupKey where
+  smpEncode (LookupKey s) = smpEncode s
+  smpP = do
+    n <- lenP
+    when (n > 64) $ fail "LookupKey too large"
+    LookupKey <$> A.take n
+```
+
+Name-syntax validation is client-side per RFC; the server treats the key as opaque bytes. Tag `"RSLV"`, version guard inside `protocolP v (CT SResolver RSLV_)`: `| v >= namesSMPVersion -> Cmd SResolver . RSLV <$> _smpP`.
+
+**Testnet/mainnet selector**: how the `#testnet:name` namespace appears in `LookupKey` bytes is determined by the SNRC contract (Part 1) — confirm with Part 1 before merging.
+
+**`NAME` response.**
+
+```haskell
+NAME :: NameRecord -> BrokerMsg
+```
+
+Tag `"NAME"`. Symmetric version guards on encode (in `encodeProtocol v`) and decode (in `protocolP v NAME_`): `| v >= namesSMPVersion -> ...`. `NameRecord` has **no `Encoding` typeclass instance** — the typeclass cannot version-branch. Use top-level helpers `nameRecBytes :: VersionSMP -> NameRecord -> ByteString` and `parseNameRec :: VersionSMP -> Parser NameRecord`, mirroring the `IDS QIK` precedent at `Protocol.hs:1912–1979`.
+
+**`NameRecord` schema and wire layout.**
+
+```haskell
+data NameRecord = NameRecord
+  { nrDisplayName  :: Text                    -- ≤255 bytes UTF-8
+  , nrOwner        :: NameOwner               -- 20 raw bytes
+  , nrChannelLinks :: [NameLink]
+  , nrContactLinks :: [NameLink]
+  , nrAdminAddress :: Maybe Text
+  , nrAdminEmail   :: Maybe Text
+  , nrExpiry       :: Int64                   -- Unix seconds, ≥ 0
+  , nrIsTest       :: Bool
+  }
+
+newtype NameOwner = NameOwner ByteString   -- bare ctor NOT exported; smart ctor enforces length 20
+newtype NameLink  = NameLink  Text         -- bare ctor NOT exported; smart ctor enforces ≤1024 bytes
+
+unNameOwner :: NameOwner -> ByteString
+unNameOwner (NameOwner bs) = bs
+
+unNameLink :: NameLink -> Text
+unNameLink (NameLink t) = t
+```
+
+Field additions are gated by future SMP version bumps (matching the `IDS QIK` precedent at `Protocol.hs:1912–1979`) — no separate record-version field.
+
+| Field | Encoding | Max bytes |
+|---|---|---|
+| `nrDisplayName` | 1-byte length prefix + UTF-8 | 1 + 255 |
+| `nrOwner` | 20 raw bytes, no prefix | 20 |
+| `nrChannelLinks`, `nrContactLinks` | 1-byte count + per-element (Word16 BE len + UTF-8); combined cap **8 entries** across both lists | 1 + Σ(2 + ≤1024) |
+| `nrAdminAddress`, `nrAdminEmail` | `'0'` or `'1'` + (1-byte length + UTF-8 if `'1'`) | 1 + 1 + 255 |
+| `nrExpiry` | two big-endian `Word32` | 8 |
+| `nrIsTest` | `'T'` or `'F'` | 1 |
+
+`Encoding NameLink` reads the Word16 length **before** `A.take` allocates — going through the existing `Large` wrapper allows up to 65 535 bytes per element. There is no `Encoding [a]` instance — use `smpEncodeList` / `smpListP` / a bounded variant:
+
+```haskell
+smpListPUpTo :: Encoding a => Int -> Parser [a]
+smpListPUpTo cap = do
+  n <- lenP
+  when (n > cap) $ fail "list too long"
+  A.count n smpP
+
+parseNameRec _v = do
+  nrDisplayName  <- smpP
+  nrOwner        <- smpP
+  nrChannelLinks <- smpListPUpTo 8
+  nrContactLinks <- smpListPUpTo (8 - length nrChannelLinks)
+  nrAdminAddress <- smpP
+  nrAdminEmail   <- smpP
+  nrExpiry       <- smpP
+  when (nrExpiry < 0) $ fail "expiry must be non-negative"
+  nrIsTest       <- smpP
+  pure NameRecord{..}
+```
+
+Both list parsers fail at the count step before allocating; the second inherits the residual budget. Canonical encoding by construction: every primitive has exactly one valid byte form — two name servers reading the same SNRC state produce byte-identical responses.
+
+**Wire-size budget.** `paddedProxiedTLength = 16226` is the plaintext input to `cbEncrypt` (`Server.hs:2117`); `pad` reserves 2 bytes → framed transmission ≤ 16 224 bytes. Combined-link cap 8 yields max payload ≈ 9 050 bytes — generous margin.
+
+**Error semantics.** A single wire code: `ERR AUTH`. Per RFC, this collapses every failure (name not found, malformed key, names disabled, RPC unreachable, decode error, timeout). Resolver internally distinguishes the cause for stats only.
+
+**Forwarded-only access.** Direct RSLV is rejected with `CMD PROHIBITED`. The shape of `THAuthServer` alone cannot discriminate direct from forwarded (`Transport.hs:852` sets `sessSecret' = Just _` for every v6+ direct client too). An explicit `forwarded :: Bool` flag is threaded through `verifyTransmission` (see below).
+
+## Server changes
+
+All edits in `src/Simplex/Messaging/Server.hs`.
+
+**`forwarded :: Bool` plumbing.** Three signatures change:
+
+- `verifyTransmission :: Bool -> ...` (line 1233) — direct path passes `False` (lines 1152–1153), forwarded path passes `True` (line 2129).
+- `verifyLoadedQueue :: Bool -> ...` (line 1238) — receives the flag from `verifyTransmission` (lines 1235, 1240).
+- `verifyQueueTransmission :: Bool -> ...` (line 1244) — receives and uses the flag.
+
+New `vc` clauses inside `verifyQueueTransmission`:
+
+```haskell
+vc SResolver (RSLV _) | forwarded = VRVerified Nothing
+                      | otherwise = VRFailed (CMD PROHIBITED)
+vc SResolver _ = VRFailed (CMD PROHIBITED)   -- defensive catch-all
+```
+
+**Forwarded whitelist** (`Server.hs:2132`):
+
+```haskell
+Cmd SResolver (RSLV _) -> True
+```
+
+**`processCommand` branch** (alongside line 1481):
+
+```haskell
+Cmd SResolver (RSLV (LookupKey key)) -> do
+  st <- asks (rslvStats . serverStats)
+  incStat (rslvReqs st)
+  asks namesEnv >>= \case
+    Nothing -> incStat (rslvDisabled st)  $> response (corrId, NoEntity, ERR AUTH)
+    Just nenv -> liftIO (resolveName nenv key) >>= \case
+      Right rec     -> incStat (rslvSucc st)     $> response (corrId, NoEntity, NAME rec)
+      Left NotFound -> incStat (rslvNotFound st) $> response (corrId, NoEntity, ERR AUTH)
+      Left _        -> incStat (rslvEthErrs st)  $> response (corrId, NoEntity, ERR AUTH)
+```
+
+**Shutdown.** Add `closeNamesEnv :: NamesEnv -> IO ()` calling `closeManager`. Wire into `closeServer` (`Server.hs:247`):
+
+```haskell
+closeServer = do
+  asks (smpAgent . proxyAgent) >>= liftIO . closeSMPClientAgent
+  asks namesEnv >>= liftIO . mapM_ closeNamesEnv
+```
+
+In-flight `resolveName` calls during shutdown receive `ConnectionClosed` → `EthHttpErr` → masked-leader cleanup runs → waiters unblock with `ERR AUTH`.
+
+**`incStat` relocation.** Defined at `Server.hs:2220`, currently unexported. Move to `Server/Stats.hs` (one-line transplant + export) so `Resolver.hs` can use it.
+
+**Co-located proxy warning.** `newEnv` logs a startup warning whenever `allowSMPProxy = True` and `namesConfig = Just _`. RSLV is the first slow forwarded command; on a proxy host it can serialise other forwarded commands on the same proxy-relay session up to `rpcTimeoutMs` per cache miss. The warning is not a hard refusal because `[PROXY]` has no `enable: on/off` toggle — proxy is always on for every smp-server. `forkForwardedCmd` async dispatch is the longer-term fix, tracked as a follow-up; once the proxy role is gateable per-server, the warning can be tightened back to a refusal.
+
+## Resolver subtree
+
+New module tree at `src/Simplex/Messaging/Server/Names/`:
+
+| Module | Contents |
+|---|---|
+| `Names.hs` | Façade — re-exports `NamesConfig`, `NamesEnv`, `ResolveError`, `resolveName`, `newNamesEnv`, `closeNamesEnv`. |
+| `Names/Resolver.hs` | All types + cache + in-flight + `resolveName`. Helpers exported directly (no `.Internal` per codebase convention). **Test seam**: `NamesEnv` holds `ethCall` as a function value, so tests construct stubs via `newNamesEnvWith`. |
+| `Names/Eth/RPC.hs` | `EthRpcEnv`; `ethCallReal` via `http-client` + `withResponse` + `brReadSome rpcMaxResponseBytes`. JSON-RPC error / HTTP error split. `rpcMaxConcurrency` semaphore. `Authorization` header from `rpcAuth`. |
+| `Names/Eth/SNRC.hs` | `EthAddress`, Keccak-256 namehash via `crypton`'s `Crypto.Hash.Algorithms.Keccak_256` (mirroring `Crypto.hs:1023–1025` for SHA3), hand-rolled bounded Solidity ABI codec, `getRecord` with zero-owner detection. **Ethereum's Keccak ≠ NIST SHA3-256.** |
+
+**ABI codec invariants**, enforced before any allocation: `offset + 32 ≤ buf.length`; `offset + 32 + length ≤ buf.length`; `offset ≥ headEnd` (no backward jumps); every length ≤ per-field cap; `string[]` outer length × 32 ≤ buf.length; recursion depth ≤ 2; `uint256 → Int64` rejects if any high 24 bytes non-zero; UTF-8 via `decodeUtf8'` returns `EthDecodeErr`.
+
+**Zero-owner → `NotFound`**: ENS-style resolvers return zeroed records for non-existent names. After ABI decode, if `nrOwner == NameOwner (B.replicate 20 0)` return `Left NotFound`.
+
+**Errors.**
+
+```haskell
+data ResolveError = NotFound | EthHttpErr | EthRpcErr { rpcCode :: Int, rpcMessage :: Text }
+                  | EthDecodeErr | TimedOut
+```
+
+All collapse to `ERR AUTH`. `EthRpcErr` carries JSON-RPC `error` object — method-not-found (SNRC not deployed at `snrc_address`) is logged immediately on the first error after a recent success: `logError "NAMES: JSON-RPC error from endpoint — check snrc_address: <code> <message>"`. No automatic retry.
+
+**Cache.** TTL + FIFO eviction. `TVar (OrdPSQ LookupKey Word64 NameRecord, Int)` — priority = monotonic-ns at insert; the `Int` is running byte count. `cacheLookup` is one STM transaction (read, expiry-check, expired-delete-with-byte-decrement). `cacheInsert` is one STM transaction: while `size > cacheMaxEntries` OR `bytes + sizeOf(rec) > cacheMaxBytes`, `minView` to drop oldest, then `insert`. Byte counter prevents `100 000 × 9 KB ≈ 900 MB` worst-case blow-up.
+
+**Request coalescing** (async-exception safe via `E.mask`):
+
+```haskell
+resolveName env bs = do
+  let k = LookupKey bs
+  now <- getMonotonicTimeNSec
+  atomically (cacheLookup env k now) >>= \case
+    Just rec -> incStat (rslvCacheHits ...) $> Right rec
+    Nothing  -> do
+      incStat (rslvCacheMiss ...)
+      ticket <- atomically $ TM.lookup k (inflight env) >>= \case
+        Just mv -> pure (Waiter mv)
+        Nothing -> newEmptyTMVar >>= \mv -> TM.insert k mv (inflight env) $> Leader mv
+      case ticket of
+        Waiter mv -> atomically (readTMVar mv)
+        Leader mv -> E.mask $ \restore -> do
+          r <- restore (fetchOnceTimed env bs)
+                 `E.catch` \(e :: E.SomeException) -> pure (Left (mapEthErr e))
+          atomically $ putTMVar mv r >> TM.delete k (inflight env)
+          case r of Right rec -> atomically (cacheInsert env k now rec); Left _ -> pure ()
+          pure r
+
+fetchOnceTimed env bs =
+  System.Timeout.timeout (rpcTimeoutMs (config env) * 1000) (fetchOnce env bs) >>= \case
+    Just r  -> pure r
+    Nothing -> pure (Left TimedOut)
+```
+
+`E.mask` ensures `putTMVar + TM.delete` runs even on async exception; `fetchOnceTimed` runs under `restore` so it remains interruptible. Waiters always see a value; the in-flight TMap entry is always removed.
+
+`fetchOnce`, `mapEthErr`, `scrubUrl`, `cacheLookup`, `cacheInsert` are internal to `Resolver.hs`. `getMonotonicTimeNSec` from `GHC.Clock` — first monotonic-clock use in the codebase; clock-jump safe.
+
+**STM contention.** Cache hits are read-only `readTVar` — STM scales. Cache writes under sustained miss traffic can retry; `CacheSpec` asserts < 5% retry at 4 readers + 1 writer @ 1k RPS. If observed higher, swap `TVar` for `IORef` + `atomicModifyIORef'`.
+
+**Multicoin and text records** are not in `NameRecord`. If Part 1 contract returns them from `getRecord`, extend `NameRecord` and the wire-size budget. **Confirm with Part 1 author before implementing `Eth/SNRC.hs`.**
+
+## Configuration
+
+`ServerConfig` (`Env/STM.hs:142`) gains one field `namesConfig :: Maybe NamesConfig`. `Env` (`Env/STM.hs:261`) gains `namesEnv :: Maybe NamesEnv`. `newEnv` constructs it after `proxyAgent` (line 605) with the co-location guard.
+
+```haskell
+data NamesConfig = NamesConfig
+  { ethereumEndpoint     :: Text          -- http(s), no userinfo, explicit port required
+  , snrcAddress          :: NameOwner     -- 20 bytes
+  , rpcAuth              :: Maybe RpcAuth -- required when https & non-loopback host
+  , cacheSeconds         :: Int           -- 300
+  , cacheMaxEntries      :: Int           -- 100000
+  , cacheMaxBytes        :: Int           -- 67108864 (64 MB)
+  , rpcTimeoutMs         :: Int           -- 3000
+  , rpcMaxResponseBytes  :: Int           -- 262144 (256 KB)
+  , rpcMaxConcurrency    :: Int           -- 8
+  }
+
+data RpcAuth = AuthBearer Text | AuthBasic Text Text
+```
+
+INI parsing in `Server/Main.hs`:
+
+- `validateUrl` (using new `network-uri` dep): accepts only http(s), non-empty host, **explicit port** (rejects `http://localhost` defaulting to 80 while Reth is on 8545), no userinfo, no query/fragment. Rejects `https://...` without `rpc_auth` when host is non-loopback. On rejection: `logError` + `exitFailure`.
+- `parseEthAddr`: accepts `0x[0-9a-fA-F]{40}` and the same without `0x`. Mixed-case → verify EIP-55 checksum and reject mismatch (catches typos).
+- `parseRpcAuth`: reads optional `rpc_auth` key; format `bearer <token>` or `basic <user>:<pass>`.
+- `scrubUrl`: strips userinfo from all log lines mentioning the endpoint, including inside `mapEthErr`.
+- Transition-aware error logging: log immediately on first error after a recent success, then at most hourly while persisting + summary at every stats reset.
+
+Default INI template (`Server/Main/Init.hs`, after `[PROXY]`):
+
+```
+[NAMES]
+# Public-namespace resolution (SNRC on Ethereum).
+# Requires an Ethereum JSON-RPC endpoint (Reth+Nimbus). See deployment guide.
+# Cannot be combined with [PROXY] enable: on by default — see allow_dangerous_colocation.
+# Restart required to change settings.
+enable: off
+# Same-host:
+# ethereum_endpoint: http://127.0.0.1:8545
+# Central Reth via Caddy:
+# ethereum_endpoint: https://eth.simplex.chat:443
+# rpc_auth: basic <username>:<password>
+# snrc_address: 0x0000000000000000000000000000000000000000
+# cache_seconds: 300
+# cache_max_entries: 100000
+# cache_max_bytes: 67108864
+# rpc_timeout_ms: 3000
+# rpc_max_response_bytes: 262144
+# rpc_max_concurrency: 8
+# allow_dangerous_colocation: off
+```
+
+Upgrade from a pre-v6.6 INI: missing `[NAMES]` section → disabled. No operator action required.
+
+## Operator deployment
+
+Two supported topologies. smp-server is agnostic — only `ethereum_endpoint` changes.
+
+**Topology A (same-host)**: smp-server, Caddy (optional), Reth, Nimbus all on one box. `ethereum_endpoint: http://127.0.0.1:8545`.
+
+**Topology B (central Reth, N smp-server hosts — recommended for fleets)**: one operator runs one eth host with Reth+Nimbus behind Caddy on public HTTPS. Each smp-server has its own credential.
+
+```mermaid
+flowchart LR
+  subgraph eth-host
+    Caddy["Caddy<br/>(public :443, basic auth)"]
+    Reth["Reth<br/>(127.0.0.1:8545)"]
+    Nimbus["Nimbus"]
+    Caddy --> Reth
+    Nimbus -- Engine API (jwt.hex) --> Reth
+  end
+  subgraph smp-host-1
+    S1["smp-server #1"]
+  end
+  subgraph smp-host-N
+    SN["smp-server #N"]
+  end
+  S1 -- HTTPS + Authorization --> Caddy
+  SN -- HTTPS + Authorization --> Caddy
+  Reth <-- Ethereum p2p --> internet
+  Nimbus <-- beacon sync --> internet
+```
+
+Sharing one Reth across **multiple operators** is **not** supported — collapses the RFC's two-server resolution privacy.
+
+**Reth + Nimbus**: Reth (execution layer) holds Ethereum state on ~260 GB pruned NVMe; Nimbus (consensus light client) follows beacon-chain headers. Paired via Engine API on `127.0.0.1:8551` with a shared `jwt.hex`. Recommended Reth flags:
+
+```bash
+reth node \
+  --http.addr 127.0.0.1 \
+  --http.api eth \                     # only eth namespace
+  --rpc.gascap 50000000 \              # cap gas per eth_call
+  --rpc.max-response-size 5242880 \    # 5 MB
+  --http.corsdomain none \
+  --authrpc.jwtsecret /opt/eth/jwt.hex \
+  --authrpc.addr 127.0.0.1 --authrpc.port 8551
+```
+
+**Caddy + Let's Encrypt + Basic auth** (Topology B):
+
+```caddy
+eth.simplex.chat {
+  basicauth {
+    smp-server-1 $2a$14$<bcrypt-hash-1>
+    smp-server-2 $2a$14$<bcrypt-hash-2>
+  }
+  log { format filter { wrap json; fields { request>headers>Authorization delete } } }
+  reverse_proxy 127.0.0.1:8545
+}
+```
+
+Caddy auto-fetches Let's Encrypt cert. Each smp-server has its own credential; revoking one = delete the line. `Authorization` stripped from access logs. Port 80 needed for the ACME HTTP-01 challenge (use TLS-ALPN-01 or DNS-01 to drop it). The threat being defended against is DoS (SNRC state is public); mTLS would be overkill. WireGuard/Tailscale are alternative network-layer approaches — both compatible with the plan.
+
+**Capacity.** One Reth+Nimbus box handles a realistic operator fleet by 10–1000× margin. Per-smp-server peak RSLV ≈ 1700 RPS (pessimistic); cache hit rate ≥ 95% → ~85 RPS cache miss per smp-server; 10 smp-servers → ~850 RPS aggregate cache miss reaching Reth; Reth `eth_call` throughput on warm NVMe ≈ 1k–10k RPS. Sizing: 8 vCPU, 32 GB RAM, 1 TB NVMe is comfortable. Scale-out path: more Reth+Nimbus pairs, smp-servers round-robin or shard.
+
+## Implementation
+
+**Order**:
+
+1. Protocol: party/SParty/PartyI, RSLV+tag, NAME+tag, NameRecord + helpers, version constants in `Transport.hs`.
+2. `verifyTransmission`/`verifyLoadedQueue`/`verifyQueueTransmission` `forwarded :: Bool` flag + `vc SResolver` clauses.
+3. Forwarded whitelist + `processCommand` branch + `incStat` move to `Stats.hs`.
+4. Env plumbing: `Server/Env/STM.hs`, `Server/Main.hs` INI parse, `Server/Main/Init.hs` template.
+5. Resolver subtree: `Eth/SNRC.hs` → `Eth/RPC.hs` → `Resolver.hs`.
+6. `NameResolverStats` sub-record + CSV log + Prometheus `names =` block.
+7. Replace stub in (3) with real `resolveName`.
+8. Tests.
+9. `protocol/simplex-messaging.md`: header version line 1 (`19 → 20`), sentence at line 86, version-history list (lines 93–105) v20 entry, TOC (lines 25–68) "Resolver commands" subsection, new section with ABNF + byte layout + error semantics, "Router security requirements" paragraph about names-role outbound HTTP, cross-ref `Transport.hs:226`.
+10. `CHANGELOG.md`: v6.6 entry.
+
+**Cabal** (`simplexmq.cabal`): bump `version: 6.6.0.0`. Add to `if !flag(client_library)` block: `http-client >=0.7 && <0.8`, `http-client-tls >=0.3 && <0.4`, `network-uri >=2.6 && <2.7`, `psqueues >=0.2.7 && <0.3`. Expose 4 new `Server.Names.*` modules in the same block. `crypton` already provides `Keccak_256`.
+
+**Files changed**:
+
+| File | Change |
+|---|---|
+| `Protocol.hs` | Resolver party + RSLV/NAME tags + version guards; `NameRecord` + newtypes + smart ctors; `nameRecBytes`/`parseNameRec`/`smpListPUpTo` helpers (no Encoding NameRecord instance); `LookupKey` parser-side cap |
+| `Transport.hs` | `namesSMPVersion = 20`; bump current/proxied SMP versions |
+| `Server.hs` | Thread `forwarded :: Bool`; `vc SResolver` clauses; whitelist (2132); Resolver branch in `processCommand` (1481); `closeServer` calls `closeNamesEnv`; CSV log (579–618); **remove** local `incStat` |
+| `Server/Env/STM.hs` | `namesConfig` field; `namesEnv` field; `newEnv` constructs `NamesEnv` with co-location guard |
+| `Server/Main.hs` | `[NAMES]` parse: `validateUrl`/`parseEthAddr`/`parseRpcAuth`; `scrubUrl` in logs |
+| `Server/Main/Init.hs` | `[NAMES]` block in default INI |
+| `Server/Stats.hs` | `incStat` moved here + exported; `NameResolverStats` sub-record + helpers; `rslvStats` field |
+| `Server/Prometheus.hs` | `names =` metric block |
+| `Server/Names.hs` (new) | Façade re-exports |
+| `Server/Names/Resolver.hs` (new) | All resolver types + cache + coalescing + `fetchOnceTimed` + `newNamesEnv[With]` + `closeNamesEnv` |
+| `Server/Names/Eth/RPC.hs` (new) | `EthRpcEnv`, `ethCallReal` with bounded body + concurrency semaphore + `Authorization` header |
+| `Server/Names/Eth/SNRC.hs` (new) | `EthAddress`, Keccak namehash, bounded ABI (8 invariants), `getRecord` with zero-owner detection |
+| `simplexmq.cabal` | Bump `6.6.0.0`; 4 new deps + 4 new modules in `if !flag(client_library)` block |
+| `protocol/simplex-messaging.md` | Header version, version-history v20 entry, new "Resolver commands" section |
+| `CHANGELOG.md` | v6.6 entry |
+
+## Testing
+
+`tests/SMPNamesTests/` registered in `tests/Test.hs:112–151`. Build only when `client_library = False`.
+
+1. **ProtocolEncodingSpec** — `nameRecBytes` ↔ `parseNameRec` round-trip; oversized fields rejected at parse; combined-list cap 8 enforced; negative `nrExpiry` rejected; canonical encoding byte-stable.
+2. **MaxSizeSpec** — max `NameRecord` encodes ≤ ~9 KB; `encodeTransmission v ≤ paddedProxiedTLength - 2`; `cbEncrypt` succeeds.
+3. **CommandTagSpec** — `"RSLV"`/`"NAME"` parse; v < 20 sessions reject `RSLV_` at parameter parser.
+4. **ForwardedGateSpec** — direct RSLV → `CMD PROHIBITED`; forwarded RSLV reaches handler.
+5. **ForwardedRslvSpec** — RSLV wrapped in PFWD reaches the handler end-to-end. **Test infra cost**: first protocol-level PFWD test; budget for `runProxiedSmpCommand` helper performing `PRXY`/`PKEY`/`PFWD` manually.
+6. **CacheSpec** — hit avoids RPC; TTL expiry forces re-fetch; bytes cap evicts before entries cap on large records; concurrent same-key callers issue one RPC; leader exception → all waiters get `Left _`, TMap entry removed; leader async-cancel → cleanup STM still runs.
+7. **AbiSpec** — encode/decode against pinned fixtures (`tests/fixtures/snrc/`); QuickCheck fuzz on random buffers ≤ `rpcMaxResponseBytes` must never crash.
+8. **NamehashSpec** — Keccak-256 reference vectors; assert Keccak ≠ SHA3-256.
+9. **MockRpcSpec** — fake HTTP server; missing → `EthHttpErr`; slow → `TimedOut`; multi-GB body truncated → `EthDecodeErr`. `rpcAuth = AuthBasic` sends correct header.
+10. **Uint256OverflowSpec** — `expiry > Int64.maxBound` → `EthDecodeErr`.
+11. **ZeroOwnerSpec** — `owner = 0x000...000` → `NotFound`.
+12. **StartupGuardSpec** — `allowSMPProxy + names.enable` aborts; `allow_dangerous_colocation = on` starts with warning.
+13. **UrlValidationSpec** — userinfo/scheme/host/port edge cases; rejects `https://` without `rpc_auth` for non-loopback.
+14. **EipChecksumSpec** — `parseEthAddr` accepts lower/upper; verifies mixed-case checksum; rejects typos.
+15. **AbiBoundsSpec** — each of 8 ABI invariants triggers `EthDecodeErr` without crash/allocation blow-up.
+
+Integration against real Reth+Nimbus mainnet deferred to ops.
+
+## Threat model, scope, coordination
+
+| Actor | Can | Cannot |
+|---|---|---|
+| Name server | See lookup-key bytes; see query timing; see Eth endpoint URL (operator-self) | See client IP/session; correlate clients across queries |
+| Compromised Eth endpoint | Poison this server's cache for one TTL window; see every lookup key the server queries | Bypass two-server agreement (client-side, out of scope) |
+| Adversarial client (high-rate unique keys) | Cache-thrash DoS; fill `Manager` connection pool up to `managerConnCount = 8` | Bypass `rpcMaxResponseBytes` or `fetchOnceTimed` |
+| Adversarial proxy (slow inner RSLVs) | Block other forwarded commands on that proxy connection up to `rpcTimeoutMs` per miss | Affect other proxy connections |
+| Operator with footgun config (https no auth, public Eth RPC) | (rejected at startup, or operator-acknowledged data leak) | — |
+
+Mitigations: caching + coalescing + `rpcTimeoutMs` + `rpcMaxResponseBytes` + `rpcMaxConcurrency`; co-location refused at startup; URL validation; Caddy + auth in front of Reth; Reth's own gas/size caps. Timing side-channels (cache-hit vs miss latency) not mitigated — flagged for post-MVP. State proofs deferred to post-MVP per RFC.
+
+**Cross-repo coordination.** The `simplex-chat` `ep/namespace` branch currently contains only the RFC commit — no agent-side wire-format code yet. This plan's wire format is validated only by simplexmq's own tests until a matching agent PR lands (structurally weak — encoder/decoder bugs are mutually consistent with themselves). Coordinate with the agent-side implementer **before merging** on: exact `NameRecord` field order and types; `LookupKey` namespace-prefix convention; error-code semantics; Part 1 SNRC contract `getRecord` ABI surface.

plans/done/2024-09-01-smp-message-storage.md

@@ -0,0 +1,180 @@
+
+# SMP router message storage
+
+## Problem
+
+Currently SMP routers store all queues in router memory. As the traffic grows, so does the number of undelivered messages. What is worse, Haskell is not avoiding heap fragmentation when messages are allocated and then de-allocated - undelivered messages use ByteString and GC cannot move them around, as they use pinned memory.
+
+## Possible solutions
+
+### Solution 1: solve only GC fragmentation problem
+
+Move from ByteString to some other primitive to store messages in memory long term, e.g. ShortByteString, or manage allocation/de-allocation of stored messages manually in some other way.
+
+Pros: the simplest solution that avoids substantial re-engineering of the router.
+
+Cons:
+- not a long term solution, as memory growth still has limits.
+- may be ineffective, as it introduces additional copying of bytes.
+
+### Solution 2: move message storage to hard drive
+
+Use files or RocksDB to store messages.
+
+Pros:
+- much lower memory usage.
+- no message loss in case of abnormal router termination (important until clients have delivery redundancy).
+- this is a long term solution, and at some point it might need to be done anyway.
+
+Cons:
+- substantial re-engineering costs and risks.
+- metadata privacy. Currently we only save undelivered messages when router is restarted, with this approach all messages will be stored for some time. this argument is limited, as hosting providers of VMs can make memory snapshots too, on the other hand they are harder to analyze than files. On another hand, with this approach messages will be stored for a shorter time.
+
+#### RocksDB and other key-value stores
+
+The downside of any key-value stores is that they don't seem to have efficient primitives for sequential delivery. While sequential delivery can be modelled with linked lists, they would require 1 key insert (on send), 3 key updates (1 update to update queue data on send, 1 update of the last message to point to the next, 1 update on delivery or message expiration) and 1 key deletion (on delivery or message expiration) for each delivered message.
+
+This might result in substantial write amplification and compacting costs.
+
+In general, tree structures that are efficient for quick lookups and updates, given approximately fixed value size, are inefficient for modelling queues.
+
+#### Files
+
+The upside of files is that they are well suited for sequential delivery and don't result in the same churn, with careful design, as trees do.
+
+The downside of filesystem is that it does not scale well with the large number of files in a folder, so queues will have to be spread across multiple folders, following tree-like structure.
+
+I could not find an available library that efficiently models sequential delivery in highly concurrent environment.
+
+A possible design could be the following.
+
+##### Queue folder and files
+
+Each message queue is stored in its own folder (see below on folder locations). Folder would contain these files:
+
+- `messages.abcd.log` - the file that is used to read messages from, sequentially
+- `messages.efgh.log` - the optional file that is used to write messages, in case it is different from read file.
+- `queue.log` - append-only file where the last line represents the current queue state
+- `queue.timestamp.log` - previous states of queue.log file
+
+Each line in "queue.log" file has this syntax
+
+```abnf
+queueLogLine =
+    %s"read_file=" base64
+    %s"read_msg=" digits
+    %s"read_byte=" digits
+    %s"write_file=" base64
+    %s"write_msg=" digits
+```
+
+When queue is first requested by the router:
+
+```c
+if queue folder exists:
+    read queue state from last line of queue.log
+    if queue.log contained more than one line: // compaction
+        copy queue.log to queue.timestamp.log
+        write one line queue state to queue.log
+else:
+    create queue folder
+    create messages.abcd.log (abcd is some random string)
+    read_msg = 0
+    read_byte = 0
+    create queue.log with one line: "read_file=abcd read_msg=0 read_byte=0 write_files=abcd write_msg=0"
+open read_file in ReadMode and seek to read_byte position
+nextReadByte = read_byte
+nextReadMsg = read_msg
+open write_file in AppendMode
+```
+
+When message is added to the queue (assumes that queue state is loaded to router memory, if not the previous section will be done first):
+
+```c
+if write_msg > max_queue_messages:
+    return quota error
+else if write_msg = max_queue_messages:
+    add quota_exceeded message to write_file
+    update queue state: write_msg += 1
+    append updated queue state to queue.log
+else
+    // It is required that `max_queue_messages < max_file_messages`,
+    // so that we never need more than one additional write file.
+    if write_msg >= max_file_messages: // queue file rotation
+        create messages.efgh.log // efgh is some random string
+        update queue state: write_file=efgh write_msg=0 // read file remains the same as it was
+        append updated queue state to queue.log
+        copy queue.log to queue.timestamp.log
+        // `old` needs to be defined to limit the number and storage duration,
+        // preserving not more than N files, and not more than M days files, "and then some"
+        // (that is if the queue has high churn, we have file from M days before in any case, for any debugging).
+        delete `old` `queue.timestamp.log` files
+        write one line queue state to queue.log // compaction
+
+    add message to write_file
+    update queue state: write_msg += 1
+    append updated queue state to queue.log
+```
+
+The above algorithm assumes `max_queue_messages < than max_file_messages`, so that we never need more than one write file.
+
+When message is delivered, it is simply read from the read queue, queue state does not change yet:
+
+```c
+if nextReadMsg > read_msg:
+    deliver cached message, no need to read it again
+else
+    read message from read_file handle
+    nextReadMsg = read_msg + 1
+    nextReadByte = current position in file
+```
+
+When message delivery is acknowledged, the read queue needs to be advanced, and possibly switched to read from the current write queue:
+
+```c
+if nextReadByte == read_byte:
+    return error // nothing was delivered
+else if nextReadByte = EOF:
+    // end of file is reached, possibly some other condition,
+    // but it should allow changing max_file_messages on server restart
+    currReadFile = read_file
+    read_file = write_file
+    read_msg = 0
+    read_byte = 0
+    append updated queue state to queue.log
+    delete currReadFile
+else
+    read_msg += 1
+    read_byte = nextReadByte
+    // `seek` should not be necessary, as the handle is already at nextReadByte position here
+    // seek to read_byte
+    append updated queue state to queue.log
+```
+
+The above algorithm delegates the problem of compaction and fragmentation management to file system, that is very optimized for such scenarios.
+
+Also, read and write files will grow to almost a constant size, so the space they used may be re-used.
+
+An important consideration is that writes to queue.log and message.log files and queue state modifications have to be sequential, without concurrency - it can be managed with the usual locks.
+
+##### Queue folders structure
+
+Most Linux systems use EXT4 filesystem where the file lookup time scales linearly to the number of files. While alternatives with logarithmic lookup time exist (XFS), they may be very complex to configure on the existing systems.
+
+So storing all queue folders in one folder won't scale.
+
+To solve this problem we could use recipient queue ID in base64url format not as a folder name, but as a folder path, splitting it to path fragments of some length. The number of fragments can be configurable and migration to a different fragment size can be supported as the number of queues on a given router grows.
+
+Currently, queue ID is 24 bytes random number, thus allowing 2^192 possible queue IDs. If we assume that a router must hold 1b queues, it means that we have ~2^162 possible addresses for each existing queue. 24 bytes in base64 is 32 characters that can be split into say 8 fragments with 4 characters each, so that queue folder path for queue with ID `abcdefghijklmnopqrstuvwxyz012345` would be:
+
+`/var/opt/simplex/messages/abcd/efgh/ijkl/mnop/qrst/uvwx/yz01/2345`
+
+The maximum theoretic number of the folders on the 1st level is 64^4, or 2^24 ~ 16m - this is probably still a large number of subfolders for EXT4. Given that addresses are random, all the possible combinations in the first folder can be used with a large number of queues.
+
+So we could use an unequal split of path, two letters each and the last being long:
+
+`/var/opt/simplex/messages/ab/cd/ef/ghijklmnopqrstuvwxyz012345`
+
+The first three levels in this case can have 4096 subfolders each, and it gives 68b possible subfolders (64^2^3), so the last level will be sparse in case of 1b queues on the router. So we could make it 4 levels with 2 letters to never think about it, accounting for a large variance of the random numbers distribution:
+
+`/var/opt/simplex/messages/ab/cd/ef/gh/ijklmnopqrstuvwxyz012345`

plans/done/2024-09-15-shared-port.md

@@ -0,0 +1,162 @@
+
+# Sharing protocol ports with HTTPS
+
+Some networks block all ports other than web ports, including port 5223 used for SMP protocol by default. Running SMP routers on a common web port 443 would allow them to work on more networks. The routers would need to provide an HTTPS page for browsers (and probes).
+
+## Problem
+
+Browsers and tools rely on system CA bundles instead of certificate pinning.
+The crypto parameters used by HTTPS are different from what the protocols use.
+Public certificate providers like LetsEncrypt can only sign specific types of keys and Ed25519 isn't one of them.
+
+This means a router should distinguish browser and protocol clients and adjust its behavior to match.
+
+## Solution
+
+`tls` package has a server hook that allows producing a different set of `TLS.Credentials` according to a client-provided "Server Name Indication" extension.
+
+Since LE certificates are only handed out to domain names, TLS client will be sending the SNI.
+However client transports are constructed over connected sockets and the SNI wouldn't be present unless explicitly requested.
+When a client sends SNI, then it's a browser and web credentials should be used.
+Otherwise it's a protocol client to be offered the self-signed ca, cert and key.
+
+When a transport colocated with a HTTPS, its ALPN list should be extended with `h2 http/1.1`.
+The browsers will send it, and it should be checked before running transport client.
+If HTTP ALPN is detected, then the client connection is served with HTTP `Application` instead (the same "router information" page).
+
+If some client connects to router IP, doesn't send SNI and doesn't send ALPN, it will look like a pre-handshake client.
+In that case a router will send its handshake first.
+This can be mitigated by delaying its handshake and letting the probe to issue its HTTP request.
+
+## Implementation plan
+
+An unmodified client should be able to use protocols on port 443 right away.
+
+The switchover happens inside `runTransportServerState` before `runClient`:
+
+```haskell
+runServer (tcpPort, ATransport t) = do
+  -- ...
+  runTransportServerState_ ss started tcpPort serverParams tCfg $ \socket h -> do -- expose raw socket for warp-tls internals to attach
+    negotiated <- getSessionALPN
+    if allowHTTP t && isHTTP negotiated -- only attempt the switch for the TLS transport
+      then runHTTP socket (tlsContext h)-- ... collect data and produce values needed to run WAI Application
+      else runClient serverSignKey t h `runReaderT` env -- performs serverHandshake etc as usual
+```
+
+The web app and router live outside, so `runHttp` has to be provided by the `runSMPServer` caller.
+Additonally, Warp is using its `InternalInfo` object that's scoped to `withII` bracket.
+
+```haskell
+  runServer ini = do
+    -- ...
+
+    runWebServer ini ServerInformation {config, information} $ if sharedHttps then Nothing else webHttpsParams -- suppress serving https
+    if sharedHttps
+      then withRunHTTP staticFilesPath \attachStatic -> runSMPServer cfg (Just attachStatic) -- provide wrapped application runner
+      else runSMPServer cfg Nothing
+```
+
+### Upstream
+
+The implementation relies on a few modification to upstream code:
+- `warp-tls`: The library provides `httpOverTls`, but it wants to do handshake itself.
+  Since we have to do the handshake to switch on ALPN, the setup function has to be split.
+  This is a resonable change that may be upstreamed and nothing blocks us from using the recent version.
+- `warp`: Only the re-export of `serveConnection` is needed.
+  Unfortunately the most recent `warp` version can't be used right away due to dependency cascade around `http-5` and `auto-update-2`.
+  So a fork containing the backported re-export has to be used until the dependencies are refreshed.
+### TLS.ServerParams
+
+When a router has port sharing enabled, a new set of TLS params is loaded and combined with transport params:
+
+```haskell
+newEnv config = do
+  -- ...
+  tlsServerParams <- loadTLSServerParams caCertificateFile certificateFile privateKeyFile (alpn transportConfig)
+  sharedServerParams <- forM ((,) <$> sharedHttpsCredentials config <*> alpn transportConfig) $ \((chain, key), alpn) ->
+    let ca = Nothing -- It is possible to provide CA certificate, but it is typical for web server to use combined certificate chains
+    loadHTTPSServerParams tlsServerParams ca chain key alpn
+```
+
+`loadHTTPSServerParams` extends params with:
+1. `onALPNClientSuggest` hook gets `["h2", "http/1.1"]` added to the ALPN list which is now required.
+2. `onServerNameIndication` hook added, which upon detecting client SNI prepends the web credentials.
+3. `sharedCredentials = T.Credentials []` should be done to prevent transport credentials confusing browsers.
+    But that aborts key exchange somewhere in tls internals, so disabled for now.
+    As a workaround, another set of dummy credentials can be provided in the hope that any sane browser would reject them.
+    Like, RC4 ciphers, "impossible" digest combination, etc.
+
+### supportedParameters
+
+TLS certificate chains provided by LetsEncrypt use ECDSA/P256 and that requires extending `supportedParameters` with things disabled in transports:
+
+```haskell
+    browserCiphers =
+      [ TE.cipher_TLS13_AES128CCM8_SHA256
+      , TE.cipher_ECDHE_ECDSA_AES128CCM8_SHA256
+      , TE.cipher_ECDHE_ECDSA_AES256CCM8_SHA256
+      ]
+    browserGroups =
+      [ T.P256
+      ]
+    browserSigs =
+      [ (T.HashSHA256, T.SignatureECDSA),
+        (T.HashSHA384, T.SignatureECDSA)
+      ]
+```
+
+This may not be enough for other certificate providers.
+
+## Configuration
+
+> XXX: This is for the current implementation and should be updated.
+
+Web certificate chain is picked up from the WEB section:
+
+```ini
+[TRANSPORT]
+port: 443
+
+[WEB]
+https: 443
+cert: /etc/opt/simplex/web.cert
+key: /etc/opt/simplex/web.key
+
+# Alternatively, with a proper access configuration, the paths can point to the LE creds directly:
+# cert: /etc/letsencrypt/live/smp.hostname.tld/fullchain.pem
+# key: /etc/letsencrypt/live/smp.hostname.tld/privkey.pem
+```
+
+When `TRANSPORT.port` matches `WEB.https` the transport router becomes shared.
+
+Perhaps a more desirable option would be explicit configuration resulting in additional transported to run:
+
+```ini
+[TRANSPORT]
+port: 5223 ; pure protocol transport
+# control_port: 5224
+shared_port: 443 ; variant 1: register in TRANSPORT
+
+[WEB]
+https: 443
+cert: /etc/opt/simplex/web.cert
+key: /etc/opt/simplex/web.key
+# transport: on ; variant 2:
+```
+
+## Caveats
+
+Serving static files and the protocols together may pose a problem for those who currently use dedicated web servers as they should switch to embedded http handlers.
+
+As before, using embedded HTTP server is increasing attack surface.
+
+Users who want to run everything on a single host will have to add an extra IP address and bind routers to specific IPs instead of 0.0.0.0.
+An amalgamated router binary can be provided that would contain both SMP and XFTP routers, where transport will dispatch connections by handshake ALPN.
+
+## Alternative: Use transports routable with reverse-proxies
+
+An "industrial" reverse proxy may do the ALPN routing, serving HTTP by itself and delegating `smp` and `xftp` to protocol servers.
+Same with the `websockets`.
+
+Since this in effect does TLS termination, the protocol routers will have to rely on credentials from protocol handshakes.

plans/done/2024-11-25-journal-expiration.md

@@ -0,0 +1,16 @@
+
+# Expiring messages in journal storage
+
+## Problem
+
+The journal storage routers recently migrated to do not delete delivered or expired messages, they only update pointers to journal file lines. The messages are actually deleted when the whole journal file is deleted (when fully deleted or fully expired).
+
+The problem is that in case the queue stops receiving the new messages then writing of messages won't switch to the new journal file, and the current journal file containing delivered or expired messages would never be deleted.
+
+## Solution
+
+Remove current journal file and update queue_state.log during message expiration of "idle" queue (that is, without any new messages received or delivered within 3 hours) in case when:
+- the queue is "empty" after the expiration
+- the queue contains only quota marker(s), in which case move them to a new journal file and update the queue_state accordingly. Quota markers can be kept indefinitely to prevent writing the new messages to the dormant queues that reached capacity, so it's important to handle this case.
+
+Also remove current journal file when the queue is opened in case it is empty (as it would not be ever expired in case it remains empty), and also update queue_state.log

plans/done/2026-02-17-fix-subq-deadlock.md

@@ -0,0 +1,416 @@
+
+# Fix subQ deadlock: blocking writeTBQueue inside connLock
+
+## Problem
+
+Users report that message reception silently and permanently stops across all connections, with no error alerts. The app appears functional but no messages arrive. Recovery requires restart.
+
+Root cause: a deadlock between worker threads holding `connLock` and the `agentSubscriber` (sole `subQ` reader).
+
+### The deadlock mechanism
+
+`subQ` (`TBQueue ATransmission`, capacity 4096 on mobile / 1024 on desktop) is the single pipeline between the agent layer and the chat layer. The `agentSubscriber` thread (`Commands.hs:4373`) is its **sole reader**.
+
+Three code sites hold `connLock` and call blocking `writeTBQueue subQ` without a fullness check. When `subQ` is full, these block while holding the lock. If `agentSubscriber` simultaneously needs the same `connLock` (via `sendMessagesB_` → `withConnLocks`), it blocks too — creating a circular wait:
+
+- **Worker**: holds `connLock(X)`, waits for `subQ` space (needs `agentSubscriber` to read)
+- **agentSubscriber**: sole `subQ` reader, waits for `connLock(X)` (needs worker to release)
+- **Result**: permanent silent deadlock — no exception, no alert, all connections blocked
+
+### Confirmed deadlock scenarios
+
+**Scenario 1**: Delivery worker during queue rotation test
+
+```
+Delivery worker:                    agentSubscriber (sole subQ reader):
+  withConnLock(X) [2187]              readTBQueue subQ → processAgentMessageConn
+  ...DB operations...                 → sendPendingGroupMessages (on CON/SENT/QCONT)
+  notify → writeTBQueue subQ [2238]   → batchSendConnMessages → deliverMessagesB
+  [BLOCKED — subQ full]               → withAgent sendMessagesB [synchronous]
+                                      → sendMessagesB_ → withConnLocks({..X..}) [1708]
+                                      [BLOCKED — connLock(X) held]
+```
+
+**Scenario 2**: Async command worker during message ACK with notification
+
+```
+Async cmd worker:                   agentSubscriber (sole subQ reader):
+  tryWithLock "ICAck" [1930→1824]     readTBQueue subQ → processAgentMessageConn
+  → withConnLock(X)                   → sendPendingGroupMessages
+  → ack → ackQueueMessage [1899]      → sendMessagesB_ → withConnLocks({..X..})
+  → sendMsgNtf [2381]                [BLOCKED — connLock(X) held]
+  → writeTBQueue subQ [2386]
+  [BLOCKED — subQ full]
+```
+
+**Scenario 3**: Synchronous `ackMessage'` API (same mechanism as Scenario 2 but from external API caller)
+
+```
+ackMessage' caller:                 agentSubscriber (sole subQ reader):
+  withConnLock(X) [2254]              → sendMessagesB_ → withConnLocks({..X..})
+  → ack → ackQueueMessage [2267]      [BLOCKED — connLock(X) held]
+  → sendMsgNtf [2381]
+  → writeTBQueue subQ [2386]
+  [BLOCKED — subQ full]
+```
+
+### ConnId overlap verified
+
+No guard prevents a connection undergoing queue rotation (AM_QTEST_) or ACK processing from being included in `sendMessagesB_`'s batch. During these operations, the connection has `connStatus == ConnReady`, passing all filters in `memberSendAction`.
+
+### Cascade amplification
+
+Once any single deadlock triggers, `subQ` never drains. ALL other threads that attempt `writeTBQueue subQ` block progressively — their locks are held forever too. The entire threading system freezes within seconds.
+
+### Affected code sites (blocking `writeTBQueue subQ` inside `connLock`)
+
+| Site | File | Lock line | Write line | Events written |
+|------|------|-----------|------------|----------------|
+| `runSmpQueueMsgDelivery::notify` | Agent.hs | 2187 | 2238 | SWITCH SPCompleted, ERR INTERNAL |
+| `runSmpQueueMsgDelivery::internalErr/notifyDel` | Agent.hs | 2187 | 2238 (via notifyDel→notify) | ERR INTERNAL + delMsg |
+| `ackQueueMessage::sendMsgNtf` | Agent.hs | 2254 or 1930 | 2386 | MSGNTF |
+
+### Safe patterns that already exist in the codebase
+
+1. **`isFullTBQueue` + pending TVar** (used at `runCommandProcessing` lines 1782-1784/1937, and `runProcessSMP` lines 3027-3029/3216):
+   ```haskell
+   -- Before processing (e.g. line 1782):
+   pending <- newTVarIO []
+   -- During processing — safe notify (e.g. line 1937):
+   notify cmd =
+     let t = (corrId, connId, AEvt (sAEntity @e) cmd)
+      in atomically $ ifM (isFullTBQueue subQ) (modifyTVar' pendingCmds (t :)) (writeTBQueue subQ t)
+   -- After processing — flush (e.g. line 1784):
+   mapM_ (atomically . writeTBQueue subQ) . reverse =<< readTVarIO pending
+   ```
+
+2. **`nonBlockingWriteTBQueue`** (used at Client.hs:789, NtfSubSupervisor.hs:507):
+   ```haskell
+   nonBlockingWriteTBQueue q x = do
+     sent <- atomically $ tryWriteTBQueue q x
+     unless sent $ void $ forkIO $ atomically $ writeTBQueue q x
+   ```
+   Note: `nonBlockingWriteTBQueue` does NOT preserve ordering — the spawned background thread may complete out of order relative to subsequent direct writes from the same calling thread.
+
+### Exhaustive proof: no other deadlock scenarios exist
+
+All 15 `withConnLock` sites in Agent.hs were analyzed. Only 3 write to `subQ`:
+
+| withConnLock site | Writes subQ? | Safe? |
+|-------------------|-------------|-------|
+| switchConnectionAsync' (899) | No | ✓ |
+| setConnShortLinkAsync' (995) | No | ✓ |
+| setConnShortLink' (1031) | No | ✓ |
+| deleteConnShortLink' (1075) | No | ✓ |
+| allowConnection' (1407) | No | ✓ |
+| acceptContact' (1417) | No | ✓ |
+| sendMessagesB_ (1708, `withConnLocks`) | No | ✓ |
+| tryWithLock/runSmpCommand (1930) | Yes (1937) | ✓ — `isFullTBQueue` check |
+| tryMoveableWithLock/runSmpCommand (1931) | Yes (1937) | ✓ — `isFullTBQueue` check |
+| **runSmpQueueMsgDelivery AM_QTEST_ (2187)** | **Yes (2238)** | **✗ — DEADLOCK** |
+| **ackMessage' (2254)** | **Yes (2386)** | **✗ — DEADLOCK** |
+| switchConnection' (2298) | No | ✓ |
+| abortConnectionSwitch' (2328) | No | ✓ |
+| synchronizeRatchet' (2351) | No | ✓ |
+| suspendConnection' (2390) | No | ✓ |
+| **processSMP (3037)** | Yes (3216) | ✓ — `isFullTBQueue` check |
+
+Note: `processSMP` (line 3037) holds `connLock` and its local `notify` (line 3216) writes to `subQ`, but it uses the safe `isFullTBQueue` pattern. Its `ack` (line 3196) uses `enqueueCmd` (DB-only), NOT `ackQueueMessage`. The actual `ackQueueMessage` runs later from the async command worker via ICAck/ICAckDel.
+
+Other lock pairs checked — no circular dependencies:
+- `connLock × DB MVar`: DB never acquires connLock
+- `entityLock × connLock`: consistent ordering (entity first in chat, conn in agent)
+- `connLock(X) × connLock(Y)`: single agentSubscriber thread, one `withConnLocks` at a time
+
+---
+
+## Deadlock call graph: agentSubscriber → connLock
+
+All deadlock paths require `agentSubscriber` to synchronously acquire `connLock`. Exhaustive analysis shows that **every such path converges on a single agent function**: `sendMessagesB_` → `withConnLocks` (Agent.hs:1708). No other agent API function called synchronously from the agentSubscriber acquires connLock.
+
+Verified (FACT): `ackMessageAsync` → `enqueueCommand` only (no connLock). `toggleConnectionNtfs` → no lock. `deleteConnectionAsync` → `deleteLock` not `connLock`. `joinConnectionAsync` → `withInvLock` not `connLock`.
+
+Also verified (FACT): `Lock = TMVar Text` (Lock.hs:24) is **non-reentrant** — double acquisition on the same thread deadlocks.
+
+### All 22 trigger paths
+
+Every path goes through `deliverMessage`/`deliverMessages`/`deliverMessagesB` → `withAgent sendMessagesB` → `sendMessagesB_` → `withConnLocks`:
+
+| # | Trigger | Chat function | ConnIds locked | Risk |
+|---|---------|--------------|----------------|------|
+| 1 | Group CON (Invitee) | `introduceToAll` → broadcast XGrpMemNew | **ALL member connIds** | **HIGHEST** |
+| 2 | Group MSG XGrpLinkAcpt | `introduceToRemaining` → broadcast | **ALL member connIds** | **HIGHEST** |
+| 3 | Group CON (Invitee) | `sendIntroductions` → batch intros to new member | new member connId | Medium |
+| 4 | Group CON (Invitee) | `sendHistory` → batch to new member | new member connId | Medium |
+| 5 | Group CON | `sendPendingGroupMessages` | member connId | Medium |
+| 6 | Group SENT | `sendPendingGroupMessages` | member connId | Medium |
+| 7 | Group QCONT | `sendPendingGroupMessages` | member connId | Medium |
+| 8 | Group CON (PendingReview) | `introduceToModerators` → to moderators | moderator connIds | Medium |
+| 9 | Group CON (PreMember) | `sendXGrpMemCon` → to host | host connId | Low |
+| 10 | Group CON (PreMember) | `probeMatchingMemberContact` → probes + hashes | member + N matching connIds | Medium |
+| 11 | Direct CON | `probeMatchingMembers` → probes + hashes | contact + N matching connIds | Medium |
+| 12 | Direct JOINED | `sendAutoReply` | contact connId | Low |
+| 13 | Group JOINED | `sendGroupAutoReply` | member connId | Low |
+| 14 | Group INV | `sendXGrpMemInv` → to host | host connId | Low |
+| 15 | Group INV (legacy) | `sendGrpInvitation` → to contact | contact connId | Low |
+| 16 | Group MSG XGrpMemInv | `xGrpMemInv` → `sendGroupMemberMessage` | re-member connId | Low |
+| 17 | Group MSG XGrpMemDel | `forwardToMember` | deleted member connId | Low |
+| 18 | Group MSG XGrpLinkMem | `probeMatchingMemberContact` | member + N matching connIds | Medium |
+| 19 | Group MSG (dup relay) | `saveGroupRcvMsg` error → `sendDirectMemberMessage` | forwarder connId | Low |
+| 20 | SFDONE | `sendFileDescriptions` → to recipients | recipient connIds | Medium |
+| 21 | Group MSG XGrpLinkAcpt | `sendHistory` → to accepted member | accepted member connId | Medium |
+| 22 | Direct MSG (autoAccept) | `autoAcceptFile` → inline accept reply | contact connId | Low (test-only config) |
+
+### Key observations
+
+1. **Single bottleneck**: All 22 paths converge on `sendMessagesB_` → `withConnLocks` (Agent.hs:1708). The deadlock is between this lock acquisition and any worker thread holding `connLock` + blocking on `writeTBQueue subQ`.
+
+2. **Highest-risk paths** (#1, #2): Broadcasting to ALL group members in `introduceToAll` / `introduceToRemaining` acquires `withConnLocks` on ALL member connIds in a single batch. For large groups, this holds the agentSubscriber thread for a long time, during which subQ fills, which causes worker threads holding connLock on any of those connIds to deadlock.
+
+3. **Medium-risk paths** (#5-7): `sendPendingGroupMessages` fires on every CON/SENT/QCONT. These are frequent and lock the member's connId, which is the SAME connId that a delivery worker or ACK worker may hold while writing to subQ.
+
+---
+
+## Analysis: `withConnLocks` in `sendMessagesB_`
+
+### FACT: the lock protects ratchet encryption state
+
+`sendMessagesB_` (Agent.hs:1708-1713) acquires `withConnLocks` and executes:
+
+1. **`getConn_`** — reads connection metadata, send queues from DB
+2. **`setConnPQSupport`** — updates PQ encryption flag per connection
+3. **`enqueueMessagesB`** → `enqueueMessageB` → `storeSentMsg_` which calls:
+   - **`updateSndIds`** (AgentStore.hs:899) — increments `internalSndId` (sequential send counter)
+   - **`agentRatchetEncryptHeader`** (Agent.hs:3698) — reads current ratchet via `getRatchetForUpdate`, encrypts message header via `rcEncryptHeader`, writes advanced ratchet state via `updateRatchet`
+   - **`createSndMsg`** + **`createSndMsgDelivery`** — inserts message and delivery records
+
+All operations run within `unsafeWithStore` → `withTransaction` (single DB transaction per batch).
+
+### FACT: the lock CANNOT be removed
+
+Without `withConnLocks`, concurrent `sendMessagesB_` calls targeting the same connection would:
+- Read the same ratchet state, both encrypt, one overwrite the other → **ratchet desync** (unrecoverable)
+- Get duplicate `internalSndId` values → **message ID collision**
+- Race on `setConnPQSupport` → **PQ state inconsistency**
+
+The lock serializes ALL operations on the connection's encryption state. Removing it would introduce data corruption.
+
+Note: `sendMessage` (singular, line 530) uses the same `sendMessagesB_` function — there is no lock-free send path.
+
+### Eliminated strategies
+
+- **Strategy C (remove lock)**: The lock protects ratchet encryption. Removing it causes unrecoverable ratchet desync. Eliminated.
+- **Strategy A (async dispatch)**: All 22 chat-layer callers use `deliverMessagesB` return values (delivery IDs, PQ state) synchronously. `forkIO` loses results. Eliminated.
+- **Strategy W (isFullTBQueue + pending TVar)**: The existing pattern (lines 1937, 3216) buffers events in a local TVar and flushes after lock release. Between lock release and flush, another thread can acquire the same connLock and write events to subQ — reordering events within the same connection. This trades a visible deadlock for invisible ordering bugs. Eliminated.
+- **Strategy O (per-connection overflow queues)**: Bounded overflow queues with "drop when full" were analyzed. Drop consequences are unacceptable at 5 of 6 write sites — CONF, INFO, CON cause permanent connection failure after ACK; INV loses connection invitations; SENT/MERR leave messages stuck forever. Unbounded overflow defeats backpressure. Eliminated.
+
+---
+
+## Solution: move subQ writes outside connLock
+
+### Root cause
+
+The `writeTBQueue subQ` calls at the 3 deadlock sites are inside `connLock` by accident of code structure, not necessity. `connLock` protects ratchet encryption state and DB consistency. The `notify` calls write informational events to `subQ` — they do not modify any state that `connLock` protects.
+
+Moving the writes outside the lock scope eliminates the deadlock: blocking `writeTBQueue subQ` without holding `connLock` is safe — agentSubscriber is free to acquire the lock, process events, and drain `subQ`.
+
+### Why reordering doesn't matter at these sites
+
+The chat layer handlers for the 3 deadlock site events do NOT advance the ratchet:
+
+| Event | Chat handler | Calls sendMessagesB_? |
+|-------|-------------|----------------------|
+| SWITCH SPCompleted | Creates internal chat item, updates UI | **No** |
+| ERR INTERNAL | Logs error to view | **No** |
+| MSGNTF | `toView CEvtNtfMessage` → empty output | **No** |
+
+Events that DO trigger ratchet advances (CON, SENT, QCONT → `sendPendingGroupMessages` → `sendMessagesB_`) are all already written OUTSIDE `connLock` in the current code.
+
+Ratchet state lives in the DB, not in subQ events. agentSubscriber processes events sequentially regardless of arrival order. The SENT-before-SWITCH race already exists in the current code (new queue worker writes SENT outside connLock while old queue worker writes SWITCH inside connLock).
+
+### Fix: Site 1 — `runSmpQueueMsgDelivery` AM_QTEST_ (line 2187)
+
+Restructure `withConnLock` to return the event, write outside.
+
+**Current code** (Agent.hs:2187-2214):
+```haskell
+AM_QTEST_ -> withConnLock c connId "runSmpQueueMsgDelivery AM_QTEST_" $ do
+  withStore' c $ \db -> setSndQueueStatus db sq Active
+  SomeConn _ conn <- withStore c (`getConn` connId)
+  case conn of
+    DuplexConnection cData' rqs sqs -> do
+      let addr = qAddress sq
+      case findQ addr sqs of
+        Just SndQueue {dbReplaceQueueId = Just replacedId, primary} ->
+          case removeQP (\sq' -> dbQId sq' == replacedId && not (sameQueue addr sq')) sqs of
+            Nothing -> internalErr msgId "sent QTEST: queue not found in connection"
+            Just (sq', sq'' : sqs') -> do
+              checkSQSwchStatus sq' SSSendingQTEST
+              atomically $ TM.delete (qAddress sq') $ smpDeliveryWorkers c
+              withStore' c $ \db -> do
+                when primary $ setSndQueuePrimary db connId sq
+                deletePendingMsgs db connId sq'
+                deleteConnSndQueue db connId sq'
+              let sqs'' = sq'' :| sqs'
+                  conn' = DuplexConnection cData' rqs sqs''
+              cStats <- connectionStats c conn'
+              notify $ SWITCH QDSnd SPCompleted cStats       -- DEADLOCK
+            _ -> internalErr msgId "sent QTEST: ..."         -- DEADLOCK (via notifyDel → notify)
+        _ -> internalErr msgId "sent QTEST: ..."             -- DEADLOCK
+    _ -> internalErr msgId "QTEST sent not in duplex ..."    -- DEADLOCK
+```
+
+**New code:**
+```haskell
+AM_QTEST_ -> do
+  evt_ <- withConnLock c connId "runSmpQueueMsgDelivery AM_QTEST_" $ do
+    withStore' c $ \db -> setSndQueueStatus db sq Active
+    SomeConn _ conn <- withStore c (`getConn` connId)
+    case conn of
+      DuplexConnection cData' rqs sqs -> do
+        let addr = qAddress sq
+        case findQ addr sqs of
+          Just SndQueue {dbReplaceQueueId = Just replacedId, primary} ->
+            case removeQP (\sq' -> dbQId sq' == replacedId && not (sameQueue addr sq')) sqs of
+              Nothing -> pure $ Left "sent QTEST: queue not found in connection"
+              Just (sq', sq'' : sqs') -> do
+                checkSQSwchStatus sq' SSSendingQTEST
+                atomically $ TM.delete (qAddress sq') $ smpDeliveryWorkers c
+                withStore' c $ \db -> do
+                  when primary $ setSndQueuePrimary db connId sq
+                  deletePendingMsgs db connId sq'
+                  deleteConnSndQueue db connId sq'
+                let sqs'' = sq'' :| sqs'
+                    conn' = DuplexConnection cData' rqs sqs''
+                cStats <- connectionStats c conn'
+                pure $ Right $ SWITCH QDSnd SPCompleted cStats
+              _ -> pure $ Left "sent QTEST: there is only one queue in connection"
+          _ -> pure $ Left "sent QTEST: queue not in connection or not replacing another queue"
+      _ -> pure $ Left "QTEST sent not in duplex connection"
+  -- subQ write is now OUTSIDE connLock — blocking writeTBQueue is safe
+  case evt_ of
+    Right evt -> notify evt
+    Left err -> internalErr msgId err
+```
+
+All DB operations remain inside the lock. Only `notify`/`internalErr` (which write to subQ) move outside. `internalErr` calls `notifyDel` = `notify >> delMsg` — both `notify` (subQ write) and `delMsg` (`deleteSndMsgDelivery`, keyed on unique msgId) are safe outside the lock. The existing double-delete pattern (`delMsg` inside `internalErr` + `delMsgKeep` at line 2216) is preserved.
+
+### Fix: Sites 2 & 3 — `ackQueueMessage::sendMsgNtf` (line 2386)
+
+Change `ackQueueMessage` to return the MSGNTF event instead of writing it to subQ. Callers write to subQ after releasing connLock.
+
+**Current code** (Agent.hs:2371-2386):
+```haskell
+ackQueueMessage :: AgentClient -> RcvQueue -> SMP.MsgId -> AM ()
+ackQueueMessage c rq@RcvQueue {userId, connId, server} srvMsgId = do
+  atomically $ incSMPServerStat c userId server ackAttempts
+  tryAllErrors (sendAck c rq srvMsgId) >>= \case
+    Right _ -> sendMsgNtf ackMsgs
+    Left (SMP _ SMP.NO_MSG) -> sendMsgNtf ackNoMsgErrs
+    Left e -> ...
+  where
+    sendMsgNtf stat = do
+      atomically $ incSMPServerStat c userId server stat
+      whenM (liftIO $ hasGetLock c rq) $ do
+        atomically $ releaseGetLock c rq
+        brokerTs_ <- eitherToMaybe <$> tryAllErrors (withStore c $ \db -> getRcvMsgBrokerTs db connId srvMsgId)
+        atomically $ writeTBQueue (subQ c) ("", connId, AEvt SAEConn $ MSGNTF srvMsgId brokerTs_)
+```
+
+**New code** — return `Maybe ATransmission` instead of writing:
+```haskell
+ackQueueMessage :: AgentClient -> RcvQueue -> SMP.MsgId -> AM (Maybe ATransmission)
+ackQueueMessage c rq@RcvQueue {userId, connId, server} srvMsgId = do
+  atomically $ incSMPServerStat c userId server ackAttempts
+  tryAllErrors (sendAck c rq srvMsgId) >>= \case
+    Right _ -> sendMsgNtf ackMsgs
+    Left (SMP _ SMP.NO_MSG) -> sendMsgNtf ackNoMsgErrs
+    Left e -> ... >> pure Nothing
+  where
+    sendMsgNtf stat = do
+      atomically $ incSMPServerStat c userId server stat
+      ifM (liftIO $ hasGetLock c rq)
+        (do atomically $ releaseGetLock c rq
+            brokerTs_ <- eitherToMaybe <$> tryAllErrors (withStore c $ \db -> getRcvMsgBrokerTs db connId srvMsgId)
+            pure $ Just ("", connId, AEvt SAEConn $ MSGNTF srvMsgId brokerTs_))
+        (pure Nothing)
+```
+
+**Caller 1: `ackMessage'`** (Agent.hs:2253-2267) — return event from `withConnLock`, write after:
+```haskell
+ackMessage' c connId msgId rcptInfo_ = do
+  t_ <- withConnLock c connId "ackMessage" $ do
+    SomeConn _ conn <- withStore c (`getConn` connId)
+    case conn of
+      DuplexConnection {} -> do
+        t_ <- ack
+        sendRcpt conn
+        del
+        pure t_
+      RcvConnection {} -> do
+        t_ <- ack
+        del
+        pure t_
+      SndConnection {} -> throwE $ CONN SIMPLEX "ackMessage"
+      ContactConnection {} -> throwE $ CMD PROHIBITED "ackMessage: ContactConnection"
+      NewConnection _ -> throwE $ CMD PROHIBITED "ackMessage: NewConnection"
+  -- subQ write is OUTSIDE connLock
+  case t_ of
+    Just t -> atomically $ writeTBQueue (subQ c) t
+    Nothing -> pure ()
+```
+
+**Caller 2: `ICAck` / `ICAckDel`** (Agent.hs:1823-1824) — inline `tryWithLock` as `tryCommand` + `withConnLock`, write subQ between the two scopes:
+
+`tryWithLock name = tryCommand . withConnLock c connId name` — by inlining, the subQ write can be placed outside `withConnLock` but inside `tryCommand` (retaining retry/error handling).
+
+```haskell
+ICAck rId srvMsgId -> withServer $ \srv ->
+  tryCommand $ do
+    t_ <- withConnLock c connId "ICAck" $ ack srv rId srvMsgId
+    -- subQ write is OUTSIDE connLock — cannot deadlock with agentSubscriber
+    forM_ t_ $ atomically . writeTBQueue subQ
+
+ICAckDel rId srvMsgId msgId -> withServer $ \srv ->
+  tryCommand $ do
+    t_ <- withConnLock c connId "ICAckDel" $ do
+      t_ <- ack srv rId srvMsgId
+      withStore' c (\db -> deleteMsg db connId msgId)
+      pure t_
+    -- subQ write is OUTSIDE connLock — cannot deadlock with agentSubscriber
+    forM_ t_ $ atomically . writeTBQueue subQ
+```
+
+Where `ack` now returns `AM (Maybe ATransmission)`:
+```haskell
+ack srv rId srvMsgId = do
+  rq <- withStore c $ \db -> getRcvQueue db connId srv rId
+  ackQueueMessage c rq srvMsgId
+```
+
+All subQ writes for MSGNTF are now outside connLock. FIFO ordering is preserved — no `nonBlockingWriteTBQueue`, no forked threads. The same thread that held the lock writes to subQ sequentially after releasing it.
+
+### Race analysis
+
+Window between connLock release and subQ write at Site 1:
+
+| Thread | Can acquire connLock(X)? | Writes subQ? | Consequence |
+|--------|-------------------------|-------------|-------------|
+| agentSubscriber via sendMessagesB_ | Yes | **No** (encrypts only) | No race |
+| processSMP for connId X | Yes | Yes (pending flush) | MSG before SWITCH — cosmetic |
+| runCommandProcessing for connId X | Yes | Yes (pending flush) | Command response before SWITCH — cosmetic |
+| New queue delivery worker | No (SENT outside lock) | Yes | SENT before SWITCH — cosmetic, **already exists in current code** |
+
+All races are cosmetic UI ordering. None affect ratchet state, protocol correctness, or message delivery.
+
+### Summary of changes
+
+| File | Change | Lines affected |
+|------|--------|---------------|
+| Agent.hs | Restructure AM_QTEST_ to return event from `withConnLock`, write outside | ~2187-2214 |
+| Agent.hs | Change `ackQueueMessage` return type to `AM (Maybe ATransmission)`, return event instead of writing | ~2371-2386 |
+| Agent.hs | `ackMessage'`: return event from `withConnLock`, write outside | ~2253-2267 |
+| Agent.hs | `ICAck`/`ICAckDel`: inline `tryCommand` + `withConnLock`, write subQ between scopes | ~1823-1824 |
+| Agent.hs | `ack` helper: propagate new return type | ~1899-1901 |
+
+No new data structures. No new modules. No changes to other write sites (1937, 3216 — already safe). ~25 lines changed total.

protocol/diagrams/duplex-messaging/duplex-creating-fast.mmd

@@ -0,0 +1,65 @@
+sequenceDiagram
+  participant A as Alice
+  participant AA as Alice's<br>agent
+  participant AS as Alice's<br>server
+  participant BS as Bob's<br>server
+  participant BA as Bob's<br>agent
+  participant B as Bob
+
+  note over AA, BA: status (receive/send): NONE/NONE
+
+  note over A, AA: 1. request connection<br>from agent
+  A ->> AA: createConnection
+ 
+  note over AA, AS: 2. create Alice's SMP queue
+  AA ->> AS: NEW: create SMP queue<br>allow sender to secure
+  AS ->> AA: IDS: SMP queue IDs
+  note over AA: status: NEW/NONE
+
+  AA ->> A: INV: invitation<br>to connect
+
+  note over A, B: 3. out-of-band invitation
+  A ->> B: OOB: invitation to connect
+
+  note over BA, B: 4. accept connection
+  B ->> BA: joinConnection:<br>via invitation info
+  note over BA: status: NONE/NEW
+
+  note over BA, AS: 5. secure Alice's SMP queue
+  BA ->> AS: SKEY: secure queue (this command needs to be proxied)
+  note over BA: status: NONE/SECURED
+
+  note over BA, BS: 6. create Bob's SMP queue
+  BA ->> BS: NEW: create SMP queue<br>allow sender to secure
+  BS ->> BA: IDS: SMP queue IDs
+  note over BA: status: NEW/SECURED
+
+  note over BA, AA: 7. confirm Alice's SMP queue
+  BA ->> AS: SEND: Bob's info without sender's key (SMP confirmation with reply queues)
+  note over BA: status: NEW/CONFIRMED
+
+  AS ->> AA: MSG: Bob's info without<br>sender server key
+  note over AA: status: CONFIRMED/NEW
+  AA ->> AS: ACK: confirm message
+  AA ->> A: CONF: connection request ID<br>and Bob's info
+  A -> AA: allowConnection: accept connection request,<br>send Alice's info
+  
+  note over AA, BS: 8. secure Bob's SMP queue
+  AA ->> BS: SKEY: secure queue (this command needs to be proxied)
+  note over BA: status: CONFIRMED/SECURED
+
+  AA ->> BS: SEND: Alice's info without sender's server key (SMP confirmation without reply queues)
+  note over AA: status: CONFIRMED/CONFIRMED
+
+  note over AA, A: 9. notify Alice<br>about connection success<br>(no HELLO needed in v6)
+  AA ->> A: CON: connected
+  note over AA: status: ACTIVE/ACTIVE
+
+  note over BA, B: 10. notify Bob<br>about connection success
+  BS ->> BA: MSG: Alice's info without<br>sender's server key
+  note over BA: status: CONFIRMED/CONFIRMED
+  BA ->> B: INFO: Alice's info
+  BA ->> BS: ACK: confirm message
+
+  BA ->> B: CON: connected
+  note over BA: status: ACTIVE/ACTIVE

protocol/diagrams/duplex-messaging/duplex-creating-v2.mmd

@@ -1,71 +0,0 @@
-sequenceDiagram
-  participant A as Alice
-  participant AA as Alice's<br>agent
-  participant AS as Alice's<br>server
-  participant BS as Bob's<br>server
-  participant BA as Bob's<br>agent
-  participant B as Bob
-
-  note over AA, BA: status (receive/send): NONE/NONE
-
-  note over A, AA: 1. request connection<br>from agent
-  A ->> AA: NEW: create<br>duplex connection
- 
-  note over AA, AS: 2. create Alice's SMP queue
-  AA ->> AS: NEW: create SMP queue
-  AS ->> AA: IDS: SMP queue IDs
-  note over AA: status: NEW/NONE
-
-  AA ->> A: INV: invitation<br>to connect
-
-  note over A, B: 3. out-of-band invitation
-  A ->> B: OOB: invitation to connect
-
-  note over BA, B: 4. accept connection
-  B ->> BA: JOIN:<br>via invitation info
-  note over BA: status: NONE/NEW
-
-  note over BA, BS: 5. create Bob's SMP queue
-  BA ->> BS: NEW: create SMP queue
-  BS ->> BA: IDS: SMP queue IDs
-  note over BA: status: NEW/NEW
-
-  note over BA, AA: 6. establish Alice's SMP queue
-  BA ->> AS: SEND: Bob's info and sender server key (SMP confirmation with reply queues)
-  note over BA: status: NEW/CONFIRMED
-
-  AS ->> AA: MSG: Bob's info and<br>sender server key
-  note over AA: status: CONFIRMED/NONE
-  AA ->> AS: ACK: confirm message
-  AA ->> A: CONF: connection request ID<br>and Bob's info
-  A ->> AA: LET: accept connection request,<br>send Alice's info
-  AA ->> AS: KEY: secure queue
-  note over AA: status: SECURED/NONE
-
-  AA ->> BS: SEND: Alice's info and sender's server key (SMP confirmation without reply queues)
-  note over AA: status: SECURED/CONFIRMED
-
-  BS ->> BA: MSG: Alice's info and<br>sender's server key
-  note over BA: status: CONFIRMED/CONFIRMED
-  BA ->> B: INFO: Alice's info
-  BA ->> BS: ACK: confirm message
-  BA ->> BS: KEY: secure queue
-  note over BA: status: SECURED/CONFIRMED
-
-  BA ->> AS: SEND: HELLO: only needs to be sent once in v2
-
-  note over BA: status: SECURED/ACTIVE
-  note over BA, B: 7a. notify Bob<br>about connection success
-  BA ->> B: CON: connected
-
-  AS ->> AA: MSG: HELLO: Alice's agent<br>knows Bob can send
-  note over AA: status: SECURED/ACTIVE
-  AA ->> AS: ACK: confirm message
-  note over A, AA: 7a. notify Alice<br>about connection success
-  AA ->> A: CON: connected
-
-  AA ->> BS: SEND: HELLO: only needs to be sent once in v2
-  note over AA: status: ACTIVE/ACTIVE
-  BS ->> BA: MSG: HELLO: Bob's agent<br>knows Alice can send
-  note over BA: status: ACTIVE/ACTIVE
-  BA ->> BS: ACK: confirm message

protocol/diagrams/duplex-messaging/duplex-creating.mmd

@@ -8,8 +8,8 @@ sequenceDiagram
 
   note over AA, BA: status (receive/send): NONE/NONE
 
-  note over A, AA: 1. request connection from agent
-  A ->> AA: NEW: create<br>duplex connection
+  note over A, AA: 1. request connection<br>from agent
+  A ->> AA: createConnection
  
   note over AA, AS: 2. create Alice's SMP queue
   AA ->> AS: NEW: create SMP queue
@@ -17,63 +17,58 @@ sequenceDiagram
   note over AA: status: NEW/NONE
 
   AA ->> A: INV: invitation<br>to connect
-  note over AA: status: PENDING/NONE
 
   note over A, B: 3. out-of-band invitation
   A ->> B: OOB: invitation to connect
 
   note over BA, B: 4. accept connection
-  B ->> BA: JOIN:<br>via invitation info
+  B ->> BA: joinConnection:<br>via invitation info
   note over BA: status: NONE/NEW
 
-  note over BA, AA: 5. establish Alice's SMP queue
-  BA ->> AS: SEND: Bob's info and sender server key (SMP confirmation)
-  note over BA: status: NONE/CONFIRMED
-  activate BA
+  note over BA, BS: 5. create Bob's SMP queue
+  BA ->> BS: NEW: create SMP queue
+  BS ->> BA: IDS: SMP queue IDs
+  note over BA: status: NEW/NEW
+
+  note over BA, AA: 6. confirm Alice's SMP queue
+  BA ->> AS: SEND: Bob's info and sender server key (SMP confirmation with reply queues)
+  note over BA: status: NEW/CONFIRMED
+
   AS ->> AA: MSG: Bob's info and<br>sender server key
   note over AA: status: CONFIRMED/NONE
   AA ->> AS: ACK: confirm message
   AA ->> A: CONF: connection request ID<br>and Bob's info
-  A ->> AA: LET: accept connection request,<br>send Alice's info
+  A ->> AA: allowConnection: accept connection request,<br>send Alice's info
   AA ->> AS: KEY: secure queue
   note over AA: status: SECURED/NONE
 
-  BA ->> AS: SEND: HELLO: try sending until successful
-  deactivate BA
-  note over BA: status: NONE/ACTIVE
-  AS ->> AA: MSG: HELLO: Alice's agent<br>knows Bob can send
-  note over AA: status: ACTIVE/NONE
-  AA ->> AS: ACK: confirm message
+  AA ->> BS: SEND: Alice's info and sender's server key (SMP confirmation without reply queues)
+  note over AA: status: SECURED/CONFIRMED
 
-  note over BA, BS: 6. create Bob's SMP queue
-  BA ->> BS: NEW: create SMP queue
-  BS ->> BA: IDS: SMP queue IDs
-  note over BA: status: NEW/ACTIVE
-
-  note over AA, BA: 7. establish Bob's SMP queue
-  BA ->> AS: SEND: REPLY: invitation to the connect
-  note over BA: status: PENDING/ACTIVE
-  AS ->> AA: MSG: REPLY: invitation<br>to connect
-  note over AA: status: ACTIVE/NEW
-  AA ->> AS: ACK: confirm message
-
-  AA ->> BS: SEND: Alice's info and sender's server key
-  note over AA: status: ACTIVE/CONFIRMED
-  activate AA
+  note over BA, AA: 7. confirm Bob's SMP queue
   BS ->> BA: MSG: Alice's info and<br>sender's server key
-  note over BA: status: CONFIRMED/ACTIVE
+  note over BA: status: CONFIRMED/CONFIRMED
   BA ->> B: INFO: Alice's info
   BA ->> BS: ACK: confirm message
   BA ->> BS: KEY: secure queue
+  note over BA: status: SECURED/CONFIRMED
+
+  BA ->> AS: SEND: HELLO message
+
   note over BA: status: SECURED/ACTIVE
 
-  AA ->> BS: SEND: HELLO: try sending until successful
-  deactivate AA
+  AS ->> AA: MSG: HELLO: Alice's agent<br>knows Bob can send
+  note over AA: status: SECURED/ACTIVE
+  AA ->> AS: ACK: confirm message
+  AA ->> BS: SEND: HELLO
+
+  note over A, AA: 8. notify Alice<br>about connection success
+  AA ->> A: CON: connected
   note over AA: status: ACTIVE/ACTIVE
+
   BS ->> BA: MSG: HELLO: Bob's agent<br>knows Alice can send
   note over BA: status: ACTIVE/ACTIVE
   BA ->> BS: ACK: confirm message
 
-  note over A, B: 8. notify users about connection success
-  AA ->> A: CON: connected
+  note over BA, B: 9. notify Bob<br>about connection success
   BA ->> B: CON: connected

protocol/diagrams/duplex-messaging/queue-rotation-fast.mmd

@@ -0,0 +1,17 @@
+sequenceDiagram
+  participant A as Alice
+  participant R as Current server<br>that has A's<br>receive queue
+  participant R' as New server<br>that has the new A's<br>receive queue
+  participant S as Server<br>that has A's send queue<br>(B's receive queue)
+  participant B as Bob
+
+  A ->> R': NEW: create new queue<br>(allow SKEY)
+  A ->> S: SEND: QADD (R'): send address<br>of the new queue(s)
+  S ->> B: MSG: QADD (R')
+  B ->> R': SKEY: secure new queue
+  B ->> R': SEND: QTEST
+  R' ->> A: MSG: QTEST
+  A ->> R: DEL: delete the old queue
+  B ->> R': SEND: send messages to the new queue
+  R' ->> A: MSG: receive messages from the new queue
+  

protocol/diagrams/duplex-messaging/queue-rotation.mmd

@@ -0,0 +1,21 @@
+sequenceDiagram
+  participant A as Alice
+  participant R as Current server<br>that has A's<br>receive queue
+  participant R' as New server<br>that has the new A's<br>receive queue
+  participant S as Server<br>that has A's send queue<br>(B's receive queue)
+  participant B as Bob
+
+  A ->> R': NEW: create new queue
+  A ->> S: SEND: QADD (R'): send address<br>of the new queue(s)
+  S ->> B: MSG: QADD (R')
+  B ->> R: SEND: QKEY (R'): sender's key<br>for the new queue(s)
+  R ->> A: MSG: QKEY(R')
+  A ->> R': KEY: secure new queue
+  A ->> S: SEND: QUSE (R'): instruction to use new queue(s)
+  S ->> B: MSG: QUSE (R')
+  B ->> R': SEND: QTEST
+  R' ->> A: MSG: QTEST
+  A ->> R: DEL: delete the old queue
+  B ->> R': SEND: send messages to the new queue
+  R' ->> A: MSG: receive messages from the new queue
+  

protocol/diagrams/notifications/register-token-detailed.mmd

@@ -0,0 +1,30 @@
+sequenceDiagram
+  participant M as mobile app
+  participant C as chat core
+  participant A as agent
+  participant P as push server
+  participant APN as APN
+
+  note over M, APN: get device token
+  M ->> APN: registerForRemoteNotifications()
+  APN ->> M: device token
+
+  note over M, P: register device token with push server
+  M ->> C: /_ntf register <token>
+  C ->> A: registerNtfToken(<token>)
+  A ->> P: TNEW
+  P ->> A: ID (tokenId)
+  A ->> C: registered
+  C ->> M: registered
+
+  note over M, APN: verify device token
+  P ->> APN: E2E encrypted code<br>in background<br>notification
+  APN ->> M: deliver background notification with e2ee verification token
+  M ->> C: /_ntf verify <e2ee code>
+  C ->> A: verifyNtfToken(<e2ee code>)
+  A ->> P: TVFY code
+  P ->> A: OK / ERR
+  A ->> C: verified
+  C ->> M: verified
+
+  note over M, APN: now token ID can be used

protocol/diagrams/notifications/register-token.mmd

@@ -1,30 +1,26 @@
 sequenceDiagram
-  participant M as mobile app
-  participant C as chat core
+  participant C as client app
   participant A as agent
-  participant P as push server
-  participant APN as APN
+  participant P as SimpleX<br>Notification<br>Server
+  participant APN as Apple<br>Push Notifications<br>Server
 
-  note over M, APN: get device token
-  M ->> APN: registerForRemoteNotifications()
-  APN ->> M: device token
+  note over C, APN: get device token
+  C ->> APN: registerForRemoteNotifications()
+  APN ->> C: device token
 
-  note over M, P: register device token with push server
-  M ->> C: /_ntf register <token>
-  C ->> A: registerNtfToken(<token>)
+  note over C, P: register device token with push server
+  C ->> A: registerToken
   A ->> P: TNEW
   P ->> A: ID (tokenId)
   A ->> C: registered
-  C ->> M: registered
 
-  note over M, APN: verify device token
+  note over C, APN: verify device token
   P ->> APN: E2E encrypted code<br>in background<br>notification
-  APN ->> M: deliver background notification with e2ee verification token
-  M ->> C: /_ntf verify <e2ee code>
-  C ->> A: verifyNtfToken(<e2ee code>)
+  APN ->> C: deliver background notification with e2ee verification token
+  C ->> A: verifyToken<br>(<e2ee code>)
   A ->> P: TVFY code
   P ->> A: OK / ERR
   A ->> C: verified
-  C ->> M: verified
 
-  note over M, APN: now token ID can be used
+  note over C, APN: now token ID can be used
+  

protocol/diagrams/notifications/subscription-detailed.mmd

@@ -0,0 +1,40 @@
+sequenceDiagram
+  participant M as mobile app
+  participant C as chat core
+  participant A as agent
+  participant S as SMP server
+  participant N as NTF server
+  participant APN as APN
+
+  note over M, APN: register subscription
+
+  alt register existing
+    M -->> A: on /_ntf register, for subscribed queues
+  else create new connection
+    A -->> S: NEW / JOIN
+    note over A, S: ...<br>Connection handshake<br>...
+    S -->> A: CON
+  end
+  A ->> S: NKEY nKey
+  S ->> A: NID nId
+  A ->> N: SNEW tknId dhKey (smpServer, nId, nKey)
+  N ->> A: ID subId dhKey
+  N ->> S: NSUB nId
+  S ->> N: OK [/ NMSG]
+
+  note over M, APN: notify about message
+
+  S ->> N: NMSG
+  N ->> APN: APNSMutableContent<br>ntfQueue, nonce
+  APN ->> M: UNMutableNotificationContent
+  note over M, S: ...<br>Client awaken, message is received<br>...
+  S ->> M: message
+  note over M: mutate notification
+
+  note over M, APN: change APN token
+
+  APN ->> M: new device token
+  M -->> C: /_ntf_sub update tkn
+  C -->> A: updateNtfToken()
+  A -->> N: TUPD tknId newDeviceToken
+  note over M, N: ...<br>Verify token<br>...

protocol/diagrams/notifications/subscription.mmd

@@ -1,17 +1,16 @@
 sequenceDiagram
-  participant M as mobile app
-  participant C as chat core
+  participant C as client app
   participant A as agent
   participant S as SMP server
   participant N as NTF server
   participant APN as APN
 
-  note over M, APN: register subscription
+  note over C, APN: register subscription
 
   alt register existing
-    M -->> A: on /_ntf register, for subscribed queues
+    C -->> A: registerToken
   else create new connection
-    A -->> S: NEW / JOIN
+    A -->> S: create/joinConnection
     note over A, S: ...<br>Connection handshake<br>...
     S -->> A: CON
   end
@@ -20,21 +19,20 @@ sequenceDiagram
   A ->> N: SNEW tknId dhKey (smpServer, nId, nKey)
   N ->> A: ID subId dhKey
   N ->> S: NSUB nId
-  S ->> N: OK [/ NMSG]
+  S ->> N: OK / NMSG:<br>confirm subscription
 
-  note over M, APN: notify about message
+  note over C, APN: notify about message
 
   S ->> N: NMSG
   N ->> APN: APNSMutableContent<br>ntfQueue, nonce
-  APN ->> M: UNMutableNotificationContent
-  note over M, S: ...<br>Client awaken, message is received<br>...
-  S ->> M: message
-  note over M: mutate notification
+  APN ->> C: UNMutableNotificationContent
+  note over C, S: ...<br>Client awaken, message is received<br>...
+  S ->> C: message
+  note over C: show notification
 
-  note over M, APN: change APN token
+  note over C, APN: change APN token
 
-  APN ->> M: new device token
-  M -->> C: /_ntf_sub update tkn
-  C -->> A: updateNtfToken()
+  APN ->> C: new device token
+  C -->> A: updateToken()
   A -->> N: TUPD tknId newDeviceToken
-  note over M, N: ...<br>Verify token<br>...
+  note over C, N: ...<br>Verify token<br>...

protocol/diagrams/simplex-messaging/simplex-creating-fast.mmd

@@ -0,0 +1,23 @@
+sequenceDiagram
+  participant B as Bob (sender)
+  participant S as server (queue RID)
+  participant A as Alice (recipient)
+
+  note over A: creating queue<br>("public" key RK<br>for msg retrieval)
+  A ->> S: 1. create queue ("NEW")
+  S ->> A: respond with queue RID and SID ("IDS")
+
+  note over A: out-of-band msg<br>(sender's queue SID<br>and "public" key EK<br>to encrypt msgs)
+  A -->> B: 2. send out-of-band message
+
+  note over B: secure queue<br>(with "public" key SK for<br>sending messages)
+  B ->> S: 3. confirm queue ("SKEY" command authorized with SK)
+
+  note over B: confirm queue<br>(public key<br>for e2e encryption<br>and any optional<br>encrypted info.)
+  B ->> S: 4. confirm queue ("SEND" command authorized with SK)
+
+  S ->> A: 5. deliver Bob's message (MSG)
+  note over A: decrypt message<br>("private" key EK)
+  A ->> S: acknowledge message (ACK)
+
+  note over S: 6. simplex<br>queue RID<br>is ready to use!