style: Make main green again

Update LICENSE
fix: Don't allow UIAA stages to be completed if no flow includes them
2026-04-02 18:35:42 +00:00 · 2026-03-31 18:07:44 +01:00 · 2026-03-31 02:26:22 +00:00 · 2026-03-31 02:20:59 +00:00 · 2026-03-31 02:20:59 +00:00 · 2026-03-31 02:20:59 +00:00
52 changed files with 2835 additions and 1519 deletions
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -72,6 +72,12 @@ dependencies = [
 "alloc-no-stdlib",
 ]

+[[package]]
+name = "allocator-api2"
+version = "0.2.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "683d7910e743518b0e34f1186f92494becacb047c7b6bf616c96772180fef923"
+
 [[package]]
 name = "android_system_properties"
 version = "0.1.5"
@@ -113,6 +119,15 @@ version = "1.0.102"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7f202df86484c868dbad7eaa557ef785d5c66295e41b460ef922eca0723b842c"

+[[package]]
+name = "ar_archive_writer"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7eb93bbb63b9c227414f6eb3a0adfddca591a8ce1e9b60661bb08969b87e340b"
+dependencies = [
+ "object",
+]
+
 [[package]]
 name = "arbitrary"
 version = "1.4.2"
@@ -820,6 +835,16 @@ dependencies = [
 "num-traits",
 ]

+[[package]]
+name = "chumsky"
+version = "0.9.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8eebd66744a15ded14960ab4ccdbfb51ad3b81f51f3f04a80adac98c985396c9"
+dependencies = [
+ "hashbrown 0.14.5",
+ "stacker",
+]
+
 [[package]]
 name = "clang-sys"
 version = "1.8.1"
@@ -957,6 +982,7 @@ dependencies = [
 "conduwuit_service",
 "const-str",
 "futures",
+ "lettre",
 "log",
 "ruma",
 "serde-saphyr",
@@ -986,6 +1012,7 @@ dependencies = [
 "hyper",
 "ipaddress",
 "itertools 0.14.0",
+ "lettre",
 "log",
 "rand 0.10.0",
 "reqwest",
@@ -1034,6 +1061,7 @@ dependencies = [
 "hyper-util",
 "ipaddress",
 "itertools 0.14.0",
+ "lettre",
 "libc",
 "libloading 0.9.0",
 "lock_api",
@@ -1144,15 +1172,18 @@ dependencies = [
 "const-str",
 "either",
 "futures",
+ "governor",
 "hickory-resolver",
 "http",
 "image",
 "ipaddress",
 "itertools 0.14.0",
 "ldap3",
+ "lettre",
 "log",
 "loole",
 "lru-cache",
+ "nonzero_ext",
 "rand 0.10.0",
 "recaptcha-verify",
 "regex",
@@ -1757,6 +1788,22 @@ dependencies = [
 "serde",
 ]

+[[package]]
+name = "email-encoding"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9298e6504d9b9e780ed3f7dfd43a61be8cd0e09eb07f7706a945b0072b6670b6"
+dependencies = [
+ "base64 0.22.1",
+ "memchr",
+]
+
+[[package]]
+name = "email_address"
+version = "0.2.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e079f19b08ca6239f47f8ba8509c11cf3ea30095831f7fed61441475edd8c449"
+
 [[package]]
 name = "encoding_rs"
 version = "0.8.35"
@@ -1958,6 +2005,12 @@ version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d9c4f5dac5e15c24eb999c26181a6ca40b39fe946cbe4c263c7209467bc83af2"

+[[package]]
+name = "foldhash"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "77ce24cb58228fbb8aa041425bb1050850ac19177686ea6e0f41a70416f56fdb"
+
 [[package]]
 name = "form_urlencoded"
 version = "1.2.2"
@@ -2074,6 +2127,12 @@ version = "0.3.32"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "037711b3d59c33004d3856fbdc83b99d4ff37a24768fa1be9ce3538a1cde4393"

+[[package]]
+name = "futures-timer"
+version = "3.0.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f288b0a4f20f9a56b5d1da57e2227c661b7b16168e2f72365f57b63326e29b24"
+
 [[package]]
 name = "futures-util"
 version = "0.3.32"
@@ -2164,6 +2223,25 @@ version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0cc23270f6e1808e30a928bdc84dea0b9b4136a8bc82338574f23baf47bbd280"

+[[package]]
+name = "governor"
+version = "0.10.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9efcab3c1958580ff1f25a2a41be1668f7603d849bb63af523b208a3cc1223b8"
+dependencies = [
+ "cfg-if",
+ "futures-sink",
+ "futures-timer",
+ "futures-util",
+ "hashbrown 0.16.1",
+ "nonzero_ext",
+ "parking_lot",
+ "portable-atomic",
+ "smallvec",
+ "spinning_top",
+ "web-time",
+]
+
 [[package]]
 name = "h2"
 version = "0.4.13"
@@ -2228,13 +2306,23 @@ version = "0.1.2+12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "647deb1583b14d160f85f3ff626f20b6edd366e3852c9843b06077388f794cb6"

+[[package]]
+name = "hashbrown"
+version = "0.14.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e5274423e17b7c9fc20b6e7e208532f9b19825d82dfd615708b70edd83df41f1"
+dependencies = [
+ "ahash",
+ "allocator-api2",
+]
+
 [[package]]
 name = "hashbrown"
 version = "0.15.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9229cfe53dfd69f0609a49f65461bd93001ea1ef889cd5529dd176593f5338a1"
 dependencies = [
- "foldhash",
+ "foldhash 0.1.5",
 ]

 [[package]]
@@ -2242,6 +2330,11 @@ name = "hashbrown"
 version = "0.16.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "841d1cc9bed7f9236f321df977030373f4a4163ae1a7dbfe1a51a2c1a51d9100"
+dependencies = [
+ "allocator-api2",
+ "equivalent",
+ "foldhash 0.2.0",
+]

 [[package]]
 name = "hdrhistogram"
@@ -2899,6 +2992,37 @@ version = "0.5.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7a79a3332a6609480d7d0c9eab957bca6b455b91bb84e66d19f5ff66294b85b8"

+[[package]]
+name = "lettre"
+version = "0.11.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9e13e10e8818f8b2a60f52cb127041d388b89f3a96a62be9ceaffa22262fef7f"
+dependencies = [
+ "async-trait",
+ "base64 0.22.1",
+ "chumsky",
+ "email-encoding",
+ "email_address",
+ "fastrand",
+ "futures-io",
+ "futures-util",
+ "hostname",
+ "httpdate",
+ "idna",
+ "mime",
+ "nom 8.0.0",
+ "percent-encoding",
+ "quoted_printable",
+ "rustls",
+ "rustls-native-certs",
+ "serde",
+ "socket2 0.6.3",
+ "tokio",
+ "tokio-rustls",
+ "tracing",
+ "url",
+]
+
 [[package]]
 name = "libc"
 version = "0.2.183"
@@ -3281,6 +3405,12 @@ version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e9e591e719385e6ebaeb5ce5d3887f7d5676fceca6411d1925ccc95745f3d6f7"

+[[package]]
+name = "nonzero_ext"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "38bf9645c8b145698bb0b18a4637dcacbc421ea49bef2317e4fd8065a387cf21"
+
 [[package]]
 name = "noop_proc_macro"
 version = "0.3.0"
@@ -4023,6 +4153,16 @@ dependencies = [
 "prost",
 ]

+[[package]]
+name = "psm"
+version = "0.1.30"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3852766467df634d74f0b2d7819bf8dc483a0eb2e3b0f50f756f9cfe8b0d18d8"
+dependencies = [
+ "ar_archive_writer",
+ "cc",
+]
+
 [[package]]
 name = "pulldown-cmark"
 version = "0.13.1"
@@ -4127,6 +4267,12 @@ dependencies = [
 "proc-macro2",
 ]

+[[package]]
+name = "quoted_printable"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "640c9bd8497b02465aeef5375144c26062e0dcd5939dfcbb0f5db76cb8c17c73"
+
 [[package]]
 name = "r-efi"
 version = "5.3.0"
@@ -5255,6 +5401,15 @@ dependencies = [
 "windows-sys 0.61.2",
 ]

+[[package]]
+name = "spinning_top"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d96d2d1d716fb500937168cc09353ffdc7a012be8475ac7308e1bdf0e3923300"
+dependencies = [
+ "lock_api",
+]
+
 [[package]]
 name = "spki"
 version = "0.7.3"
@@ -5271,6 +5426,19 @@ version = "1.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6ce2be8dc25455e1f91df71bfa12ad37d7af1092ae736f3a6cd0e37bc7810596"

+[[package]]
+name = "stacker"
+version = "0.1.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "08d74a23609d509411d10e2176dc2a4346e3b4aea2e7b1869f19fdedbc71c013"
+dependencies = [
+ "cc",
+ "cfg-if",
+ "libc",
+ "psm",
+ "windows-sys 0.59.0",
+]
+
 [[package]]
 name = "strict"
 version = "0.2.0"
@@ -6406,6 +6574,15 @@ dependencies = [
 "windows-targets 0.52.6",
 ]

+[[package]]
+name = "windows-sys"
+version = "0.59.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e38bc4d79ed67fd075bcc251a1c39b32a1776bbe92e5bef1f0bf1f8c531853b"
+dependencies = [
+ "windows-targets 0.52.6",
+]
+
 [[package]]
 name = "windows-sys"
 version = "0.60.2"
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -556,6 +556,19 @@ version = "1.0.1"
 [workspace.dependencies.askama]
 version = "0.15.0"

+[workspace.dependencies.lettre]
+version = "0.11.19"
+default-features = false
+features = ["smtp-transport", "pool", "hostname", "builder", "rustls", "aws-lc-rs", "rustls-native-certs", "tokio1", "tokio1-rustls", "tracing", "serde"]
+
+[workspace.dependencies.governor]
+version = "0.10.4"
+default-features = false
+features = ["std"]
+
+[workspace.dependencies.nonzero_ext]
+version = "0.3.0"
+
 #
 # Patches
 #
@@ -916,7 +929,6 @@ fn_to_numeric_cast_any = "warn"
 format_push_string = "warn"
 get_unwrap = "warn"
 impl_trait_in_params = "warn"
-let_underscore_untyped = "warn"
 lossy_float_literal = "warn"
 mem_forget = "warn"
 missing_assert_message = "warn"
--- a/3
+++ b/3
@@ -1,4 +1,3 @@
-
                                 Apache License
                           Version 2.0, January 2004
                        http://www.apache.org/licenses/
@@ -187,7 +186,7 @@
      same "printed page" as the copyright notice for easier
      identification within third-party archives.

-   Copyright 2023 June
+   Copyright 2023 Continuwuity Team and contributors

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
--- a/changelog.d/+1770db35.feature.md
+++ b/changelog.d/+1770db35.feature.md
@@ -0,0 +1 @@
+Added support for associating email addresses with accounts, requiring email addresses for registration, and resetting passwords via email. Contributed by @ginger
--- a/conduwuit-example.toml
+++ b/conduwuit-example.toml
@@ -2041,3 +2041,41 @@
 # web->synapseHTTPAntispam->authorization
 #
 #secret =
+
+#[global.smtp]
+
+# A `smtp://`` URI which will be used to connect to a mail server.
+# Uncommenting the [global.smtp] group and setting this option enables
+# features which depend on the ability to send email,
+# such as self-service password resets.
+#
+# For most modern mail servers, format the URI like this:
+# 	`smtps://username:password@hostname:port`
+# Note that you will need to URL-encode the username and password. If your
+# username _is_ your email address, you will need to replace the `@` with
+# `%40`.
+#
+# For a guide on the accepted URI syntax, consult Lettre's documentation:
+# https://docs.rs/lettre/latest/lettre/transport/smtp/struct.AsyncSmtpTransport.html#method.from_url
+#
+#connection_uri =
+
+# The outgoing address which will be used for sending emails.
+#
+# For a syntax guide, see https://datatracker.ietf.org/doc/html/rfc2822#section-3.4
+#
+# ...or if you don't want to read the RFC, for some reason:
+# - `Name <address@domain.org>` to specify a sender name
+# - `address@domain.org` to not use a name
+#
+#sender =
+
+# Whether to require that users provide an email address when they
+# register.
+#
+#require_email_for_registration = false
+
+# Whether to require that users who register with a registration token
+# provide an email address.
+#
+#require_email_for_token_registration = false
--- a/docs/calls.mdx
+++ b/docs/calls.mdx
@@ -11,7 +11,3 @@ # Calls

 - For legacy calls to work, you need to set up a TURN/STUN server. [Read the TURN guide for tips on how to set up coturn](./calls/turn.mdx)
 - For MatrixRTC / Element Call to work, you have to set up the LiveKit backend (foci). LiveKit also uses TURN/STUN to increase reliability - you can set up its built-in TURN server, or integrate with an existing one. [Read the LiveKit guide](./calls/livekit.mdx)
-
-:::info
-Our [`#matrixrtc:continuwuity.org`](https://matrix.to/#/#matrixrtc:continuwuity.org) room is all about calling on matrix. Join there if you have any questions!
-:::
--- a/docs/calls/livekit.mdx
+++ b/docs/calls/livekit.mdx
@@ -5,7 +5,7 @@ # Matrix RTC/Element Call Setup
 :::

 :::tip
-You can find help setting up Matrix RTC in our dedicated room - [#matrixrtc:continuwuity.org](https://matrix.to/#/%23matrixrtc%3Acontinuwuity.org)
+You can find help setting up MatrixRTC in our dedicated room - [#matrixrtc:continuwuity.org](https://matrix.to/#/%23matrixrtc%3Acontinuwuity.org)
 :::

 ## Instructions
--- a/docs/reference/admin/debug.md
+++ b/docs/reference/admin/debug.md
@@ -130,6 +130,10 @@ ## `!admin debug database-files`

 List database files

+## `!admin debug send-test-email`
+
+Send a test email to the invoking admin's email address
+
 ## `!admin debug tester`

 Developer test stubs
--- a/docs/reference/admin/users.md
+++ b/docs/reference/admin/users.md
@@ -12,6 +12,24 @@ ## `!admin users reset-password`

 Reset user password

+## `!admin users issue-password-reset-link`
+
+Issue a self-service password reset link for a user
+
+## `!admin users get-email`
+
+Get a user's associated email address
+
+## `!admin users get-user-by-email`
+
+Get the user with the given email address
+
+## `!admin users change-email`
+
+Update or remove a user's email address.
+
+If `email` is not supplied, the user's existing address will be removed.
+
 ## `!admin users deactivate`

 Deactivate a user
--- a/src/admin/Cargo.toml
+++ b/src/admin/Cargo.toml
@@ -80,6 +80,7 @@ conduwuit-macros.workspace = true
 conduwuit-service.workspace = true
 const-str.workspace = true
 futures.workspace = true
+lettre.workspace = true
 log.workspace = true
 ruma.workspace = true
 serde_json.workspace = true
--- a/src/admin/debug/commands.rs
+++ b/src/admin/debug/commands.rs
@@ -19,6 +19,7 @@
 	warn,
 };
 use futures::{FutureExt, StreamExt, TryStreamExt};
+use lettre::message::Mailbox;
 use ruma::{
 	CanonicalJsonObject, CanonicalJsonValue, EventId, OwnedEventId, OwnedRoomId,
 	OwnedRoomOrAliasId, OwnedServerName, RoomId, RoomVersionId,
@@ -876,3 +877,31 @@ pub(super) async fn trim_memory(&self) -> Result {

 	writeln!(self, "done").await
 }
+
+#[admin_command]
+pub(super) async fn send_test_email(&self) -> Result {
+	self.bail_restricted()?;
+
+	let mailer = self.services.mailer.expect_mailer()?;
+	let Some(sender) = self.sender else {
+		return Err!("No sender user provided in context");
+	};
+
+	let Some(email) = self
+		.services
+		.threepid
+		.get_email_for_localpart(sender.localpart())
+		.await
+	else {
+		return Err!("{} has no associated email address", sender);
+	};
+
+	mailer
+		.send(Mailbox::new(None, email.clone()), service::mailer::messages::Test)
+		.await?;
+
+	self.write_str(&format!("Test email successfully sent to {email}"))
+		.await?;
+
+	Ok(())
+}
--- a/src/admin/debug/mod.rs
+++ b/src/admin/debug/mod.rs
@@ -225,6 +225,9 @@ pub enum DebugCommand {
 		level: Option<i32>,
 	},

+	/// Send a test email to the invoking admin's email address
+	SendTestEmail,
+
 	/// Developer test stubs
 	#[command(subcommand)]
 	#[allow(non_snake_case)]
--- a/src/admin/user/commands.rs
+++ b/src/admin/user/commands.rs
@@ -11,6 +11,7 @@
 	warn,
 };
 use futures::{FutureExt, StreamExt};
+use lettre::Address;
 use ruma::{
 	OwnedEventId, OwnedRoomId, OwnedRoomOrAliasId, OwnedServerName, OwnedUserId, UserId,
 	events::{
@@ -1094,3 +1095,106 @@ pub(super) async fn enable_login(&self, user_id: String) -> Result {

 	self.write_str(&format!("{user_id} can now log in.")).await
 }
+
+#[admin_command]
+pub(super) async fn get_email(&self, user_id: String) -> Result {
+	self.bail_restricted()?;
+	let user_id = parse_local_user_id(self.services, &user_id)?;
+
+	match self
+		.services
+		.threepid
+		.get_email_for_localpart(user_id.localpart())
+		.await
+	{
+		| Some(email) =>
+			self.write_str(&format!("{user_id} has the associated email address {email}."))
+				.await,
+		| None =>
+			self.write_str(&format!("{user_id} has no associated email address."))
+				.await,
+	}
+}
+
+#[admin_command]
+pub(super) async fn get_user_by_email(&self, email: String) -> Result {
+	self.bail_restricted()?;
+
+	let Ok(email) = Address::try_from(email) else {
+		return Err!("Invalid email address.");
+	};
+
+	match self.services.threepid.get_localpart_for_email(&email).await {
+		| Some(localpart) => {
+			let user_id = OwnedUserId::parse(format!(
+				"@{localpart}:{}",
+				self.services.globals.server_name()
+			))
+			.unwrap();
+
+			self.write_str(&format!("{email} belongs to {user_id}."))
+				.await
+		},
+		| None =>
+			self.write_str(&format!("No user has {email} as their email address."))
+				.await,
+	}
+}
+
+#[admin_command]
+pub(super) async fn change_email(&self, user_id: String, email: Option<String>) -> Result {
+	self.bail_restricted()?;
+
+	let user_id = parse_local_user_id(self.services, &user_id)?;
+	let Ok(new_email) = email.map(Address::try_from).transpose() else {
+		return Err!("Invalid email address.");
+	};
+
+	if self.services.mailer.mailer().is_none() {
+		warn!("SMTP has not been configured on this server, emails cannot be sent.");
+	}
+
+	let current_email = self
+		.services
+		.threepid
+		.get_email_for_localpart(user_id.localpart())
+		.await;
+
+	match (current_email, new_email) {
+		| (None, None) =>
+			self.write_str(&format!(
+				"{user_id} already had no associated email. No changes have been made."
+			))
+			.await,
+		| (current_email, Some(new_email)) => {
+			self.services
+				.threepid
+				.associate_localpart_email(user_id.localpart(), &new_email)
+				.await?;
+
+			if let Some(current_email) = current_email {
+				self.write_str(&format!(
+					"The associated email of {user_id} has been changed from {current_email} to \
+					 {new_email}."
+				))
+				.await
+			} else {
+				self.write_str(&format!(
+					"{user_id} has been associated with the email {new_email}."
+				))
+				.await
+			}
+		},
+		| (Some(current_email), None) => {
+			self.services
+				.threepid
+				.disassociate_localpart_email(user_id.localpart())
+				.await;
+
+			self.write_str(&format!(
+				"The associated email of {user_id} has been removed (it was {current_email})."
+			))
+			.await
+		},
+	}
+}
--- a/src/admin/user/mod.rs
+++ b/src/admin/user/mod.rs
@@ -35,6 +35,24 @@ pub enum UserCommand {
 		username: String,
 	},

+	/// Get a user's associated email address.
+	GetEmail {
+		user_id: String,
+	},
+
+	/// Get the user with the given email address.
+	GetUserByEmail {
+		email: String,
+	},
+
+	/// Update or remove a user's email address.
+	///
+	/// If `email` is not supplied, the user's existing address will be removed.
+	ChangeEmail {
+		user_id: String,
+		email: Option<String>,
+	},
+
 	/// Deactivate a user
 	///
 	/// User will be removed from all rooms by default.
--- a/src/api/Cargo.toml
+++ b/src/api/Cargo.toml
@@ -85,6 +85,7 @@ http-body-util.workspace = true
 hyper.workspace = true
 ipaddress.workspace = true
 itertools.workspace = true
+lettre.workspace = true
 log.workspace = true
 rand.workspace = true
 reqwest.workspace = true
--- a/src/api/client/account.rs
+++ b/src/api/client/account.rs
@@ -1,980 +0,0 @@
-use std::fmt::Write;
-
-use axum::extract::State;
-use axum_client_ip::InsecureClientIp;
-use conduwuit::{
-	Err, Error, Event, Result, debug_info, err, error, info,
-	matrix::pdu::PduBuilder,
-	utils::{self, ReadyExt, stream::BroadbandExt},
-	warn,
-};
-use conduwuit_service::Services;
-use futures::{FutureExt, StreamExt};
-use register::RegistrationKind;
-use ruma::{
-	OwnedRoomId, UserId,
-	api::client::{
-		account::{
-			ThirdPartyIdRemovalStatus, change_password, check_registration_token_validity,
-			deactivate, get_3pids, get_username_availability,
-			register::{self, LoginType},
-			request_3pid_management_token_via_email, request_3pid_management_token_via_msisdn,
-			whoami,
-		},
-		uiaa::{AuthFlow, AuthType, UiaaInfo},
-	},
-	events::{
-		GlobalAccountDataEventType, StateEventType,
-		room::{
-			member::{MembershipState, RoomMemberEventContent},
-			message::RoomMessageEventContent,
-			power_levels::{RoomPowerLevels, RoomPowerLevelsEventContent},
-		},
-	},
-	push,
-};
-
-use super::{DEVICE_ID_LENGTH, SESSION_ID_LENGTH, TOKEN_LENGTH, join_room_by_id_helper};
-use crate::Ruma;
-
-const RANDOM_USER_ID_LENGTH: usize = 10;
-
-/// # `GET /_matrix/client/v3/register/available`
-///
-/// Checks if a username is valid and available on this server.
-///
-/// Conditions for returning true:
-/// - The user id is not historical
-/// - The server name of the user id matches this server
-/// - No user or appservice on this server already claimed this username
-///
-/// Note: This will not reserve the username, so the username might become
-/// invalid when trying to register
-#[tracing::instrument(skip_all, fields(%client), name = "register_available", level = "info")]
-pub(crate) async fn get_register_available_route(
-	State(services): State<crate::State>,
-	InsecureClientIp(client): InsecureClientIp,
-	body: Ruma<get_username_availability::v3::Request>,
-) -> Result<get_username_availability::v3::Response> {
-	// workaround for https://github.com/matrix-org/matrix-appservice-irc/issues/1780 due to inactivity of fixing the issue
-	let is_matrix_appservice_irc = body.appservice_info.as_ref().is_some_and(|appservice| {
-		appservice.registration.id == "irc"
-			|| appservice.registration.id.contains("matrix-appservice-irc")
-			|| appservice.registration.id.contains("matrix_appservice_irc")
-	});
-
-	if services
-		.globals
-		.forbidden_usernames()
-		.is_match(&body.username)
-	{
-		return Err!(Request(Forbidden("Username is forbidden")));
-	}
-
-	// don't force the username lowercase if it's from matrix-appservice-irc
-	let body_username = if is_matrix_appservice_irc {
-		body.username.clone()
-	} else {
-		body.username.to_lowercase()
-	};
-
-	// Validate user id
-	let user_id =
-		match UserId::parse_with_server_name(&body_username, services.globals.server_name()) {
-			| Ok(user_id) => {
-				if let Err(e) = user_id.validate_strict() {
-					// unless the username is from the broken matrix appservice IRC bridge, we
-					// should follow synapse's behaviour on not allowing things like spaces
-					// and UTF-8 characters in usernames
-					if !is_matrix_appservice_irc {
-						return Err!(Request(InvalidUsername(debug_warn!(
-							"Username {body_username} contains disallowed characters or spaces: \
-							 {e}"
-						))));
-					}
-				}
-
-				user_id
-			},
-			| Err(e) => {
-				return Err!(Request(InvalidUsername(debug_warn!(
-					"Username {body_username} is not valid: {e}"
-				))));
-			},
-		};
-
-	// Check if username is creative enough
-	if services.users.exists(&user_id).await {
-		return Err!(Request(UserInUse("User ID is not available.")));
-	}
-
-	if let Some(ref info) = body.appservice_info {
-		if !info.is_user_match(&user_id) {
-			return Err!(Request(Exclusive("Username is not in an appservice namespace.")));
-		}
-	}
-
-	if services.appservice.is_exclusive_user_id(&user_id).await {
-		return Err!(Request(Exclusive("Username is reserved by an appservice.")));
-	}
-
-	Ok(get_username_availability::v3::Response { available: true })
-}
-
-/// # `POST /_matrix/client/v3/register`
-///
-/// Register an account on this homeserver.
-///
-/// You can use [`GET
-/// /_matrix/client/v3/register/available`](fn.get_register_available_route.
-/// html) to check if the user id is valid and available.
-///
-/// - Only works if registration is enabled
-/// - If type is guest: ignores all parameters except
-///   initial_device_display_name
-/// - If sender is not appservice: Requires UIAA (but we only use a dummy stage)
-/// - If type is not guest and no username is given: Always fails after UIAA
-///   check
-/// - Creates a new account and populates it with default account data
-/// - If `inhibit_login` is false: Creates a device and returns device id and
-///   access_token
-#[allow(clippy::doc_markdown)]
-#[tracing::instrument(skip_all, fields(%client), name = "register", level = "info")]
-pub(crate) async fn register_route(
-	State(services): State<crate::State>,
-	InsecureClientIp(client): InsecureClientIp,
-	body: Ruma<register::v3::Request>,
-) -> Result<register::v3::Response> {
-	let is_guest = body.kind == RegistrationKind::Guest;
-	let emergency_mode_enabled = services.config.emergency_password.is_some();
-
-	// Allow registration if it's enabled in the config file or if this is the first
-	// run (so the first user account can be created)
-	let allow_registration =
-		services.config.allow_registration || services.firstrun.is_first_run();
-
-	if !allow_registration && body.appservice_info.is_none() {
-		match (body.username.as_ref(), body.initial_device_display_name.as_ref()) {
-			| (Some(username), Some(device_display_name)) => {
-				info!(
-					%is_guest,
-					user = %username,
-					device_name = %device_display_name,
-					"Rejecting registration attempt as registration is disabled"
-				);
-			},
-			| (Some(username), _) => {
-				info!(
-					%is_guest,
-					user = %username,
-					"Rejecting registration attempt as registration is disabled"
-				);
-			},
-			| (_, Some(device_display_name)) => {
-				info!(
-					%is_guest,
-					device_name = %device_display_name,
-					"Rejecting registration attempt as registration is disabled"
-				);
-			},
-			| (None, _) => {
-				info!(
-					%is_guest,
-					"Rejecting registration attempt as registration is disabled"
-				);
-			},
-		}
-
-		return Err!(Request(Forbidden(
-			"This server is not accepting registrations at this time."
-		)));
-	}
-
-	if is_guest && !services.config.allow_guest_registration {
-		info!(
-			"Guest registration disabled, rejecting guest registration attempt, initial device \
-			 name: \"{}\"",
-			body.initial_device_display_name.as_deref().unwrap_or("")
-		);
-		return Err!(Request(GuestAccessForbidden("Guest registration is disabled.")));
-	}
-
-	// forbid guests from registering if there is not a real admin user yet. give
-	// generic user error.
-	if is_guest && services.users.count().await < 2 {
-		warn!(
-			"Guest account attempted to register before a real admin user has been registered, \
-			 rejecting registration. Guest's initial device name: \"{}\"",
-			body.initial_device_display_name.as_deref().unwrap_or("")
-		);
-		return Err!(Request(Forbidden(
-			"This server is not accepting registrations at this time."
-		)));
-	}
-
-	let user_id = match (body.username.as_ref(), is_guest) {
-		| (Some(username), false) => {
-			// workaround for https://github.com/matrix-org/matrix-appservice-irc/issues/1780 due to inactivity of fixing the issue
-			let is_matrix_appservice_irc =
-				body.appservice_info.as_ref().is_some_and(|appservice| {
-					appservice.registration.id == "irc"
-						|| appservice.registration.id.contains("matrix-appservice-irc")
-						|| appservice.registration.id.contains("matrix_appservice_irc")
-				});
-
-			if services.globals.forbidden_usernames().is_match(username)
-				&& !emergency_mode_enabled
-			{
-				return Err!(Request(Forbidden("Username is forbidden")));
-			}
-
-			// don't force the username lowercase if it's from matrix-appservice-irc
-			let body_username = if is_matrix_appservice_irc {
-				username.clone()
-			} else {
-				username.to_lowercase()
-			};
-
-			let proposed_user_id = match UserId::parse_with_server_name(
-				&body_username,
-				services.globals.server_name(),
-			) {
-				| Ok(user_id) => {
-					if let Err(e) = user_id.validate_strict() {
-						// unless the username is from the broken matrix appservice IRC bridge, or
-						// we are in emergency mode, we should follow synapse's behaviour on
-						// not allowing things like spaces and UTF-8 characters in usernames
-						if !is_matrix_appservice_irc && !emergency_mode_enabled {
-							return Err!(Request(InvalidUsername(debug_warn!(
-								"Username {body_username} contains disallowed characters or \
-								 spaces: {e}"
-							))));
-						}
-					}
-
-					// Don't allow registration with user IDs that aren't local
-					if !services.globals.user_is_local(&user_id) {
-						return Err!(Request(InvalidUsername(
-							"Username {body_username} is not local to this server"
-						)));
-					}
-
-					user_id
-				},
-				| Err(e) => {
-					return Err!(Request(InvalidUsername(debug_warn!(
-						"Username {body_username} is not valid: {e}"
-					))));
-				},
-			};
-
-			if services.users.exists(&proposed_user_id).await {
-				return Err!(Request(UserInUse("User ID is not available.")));
-			}
-
-			proposed_user_id
-		},
-		| _ => loop {
-			let proposed_user_id = UserId::parse_with_server_name(
-				utils::random_string(RANDOM_USER_ID_LENGTH).to_lowercase(),
-				services.globals.server_name(),
-			)
-			.unwrap();
-			if !services.users.exists(&proposed_user_id).await {
-				break proposed_user_id;
-			}
-		},
-	};
-
-	if body.body.login_type == Some(LoginType::ApplicationService) {
-		match body.appservice_info {
-			| Some(ref info) =>
-				if !info.is_user_match(&user_id) && !emergency_mode_enabled {
-					return Err!(Request(Exclusive(
-						"Username is not in an appservice namespace."
-					)));
-				},
-			| _ => {
-				return Err!(Request(MissingToken("Missing appservice token.")));
-			},
-		}
-	} else if services.appservice.is_exclusive_user_id(&user_id).await && !emergency_mode_enabled
-	{
-		return Err!(Request(Exclusive("Username is reserved by an appservice.")));
-	}
-
-	// UIAA
-	let mut uiaainfo = UiaaInfo {
-		flows: Vec::new(),
-		completed: Vec::new(),
-		params: Box::default(),
-		session: None,
-		auth_error: None,
-	};
-	let skip_auth = body.appservice_info.is_some() || is_guest;
-
-	// Populate required UIAA flows
-
-	if services.firstrun.is_first_run() {
-		// Registration token forced while in first-run mode
-		uiaainfo.flows.push(AuthFlow {
-			stages: vec![AuthType::RegistrationToken],
-		});
-	} else {
-		if services
-			.registration_tokens
-			.iterate_tokens()
-			.next()
-			.await
-			.is_some()
-		{
-			// Registration token required
-			uiaainfo.flows.push(AuthFlow {
-				stages: vec![AuthType::RegistrationToken],
-			});
-		}
-
-		if services.config.recaptcha_private_site_key.is_some() {
-			if let Some(pubkey) = &services.config.recaptcha_site_key {
-				// ReCaptcha required
-				uiaainfo
-					.flows
-					.push(AuthFlow { stages: vec![AuthType::ReCaptcha] });
-				uiaainfo.params = serde_json::value::to_raw_value(&serde_json::json!({
-					"m.login.recaptcha": {
-						"public_key": pubkey,
-					},
-				}))
-				.expect("Failed to serialize recaptcha params");
-			}
-		}
-
-		if uiaainfo.flows.is_empty() && !skip_auth {
-			// Registration isn't _disabled_, but there's no captcha configured and no
-			// registration tokens currently set. Bail out by default unless open
-			// registration was explicitly enabled.
-			if !services
-				.config
-				.yes_i_am_very_very_sure_i_want_an_open_registration_server_prone_to_abuse
-			{
-				return Err!(Request(Forbidden(
-					"This server is not accepting registrations at this time."
-				)));
-			}
-
-			// We have open registration enabled (😧), provide a dummy stage
-			uiaainfo = UiaaInfo {
-				flows: vec![AuthFlow { stages: vec![AuthType::Dummy] }],
-				completed: Vec::new(),
-				params: Box::default(),
-				session: None,
-				auth_error: None,
-			};
-		}
-	}
-
-	if !skip_auth {
-		match &body.auth {
-			| Some(auth) => {
-				let (worked, uiaainfo) = services
-					.uiaa
-					.try_auth(
-						&UserId::parse_with_server_name("", services.globals.server_name())
-							.unwrap(),
-						"".into(),
-						auth,
-						&uiaainfo,
-					)
-					.await?;
-				if !worked {
-					return Err(Error::Uiaa(uiaainfo));
-				}
-				// Success!
-			},
-			| _ => match body.json_body {
-				| Some(ref json) => {
-					uiaainfo.session = Some(utils::random_string(SESSION_ID_LENGTH));
-					services.uiaa.create(
-						&UserId::parse_with_server_name("", services.globals.server_name())
-							.unwrap(),
-						"".into(),
-						&uiaainfo,
-						json,
-					);
-					return Err(Error::Uiaa(uiaainfo));
-				},
-				| _ => {
-					return Err!(Request(NotJson("JSON body is not valid")));
-				},
-			},
-		}
-	}
-
-	let password = if is_guest { None } else { body.password.as_deref() };
-
-	// Create user
-	services.users.create(&user_id, password, None).await?;
-
-	// Default to pretty displayname
-	let mut displayname = user_id.localpart().to_owned();
-
-	// If `new_user_displayname_suffix` is set, registration will push whatever
-	// content is set to the user's display name with a space before it
-	if !services.globals.new_user_displayname_suffix().is_empty()
-		&& body.appservice_info.is_none()
-	{
-		write!(displayname, " {}", services.server.config.new_user_displayname_suffix)?;
-	}
-
-	services
-		.users
-		.set_displayname(&user_id, Some(displayname.clone()));
-
-	// Initial account data
-	services
-		.account_data
-		.update(
-			None,
-			&user_id,
-			GlobalAccountDataEventType::PushRules.to_string().into(),
-			&serde_json::to_value(ruma::events::push_rules::PushRulesEvent {
-				content: ruma::events::push_rules::PushRulesEventContent {
-					global: push::Ruleset::server_default(&user_id),
-				},
-			})?,
-		)
-		.await?;
-
-	// Generate new device id if the user didn't specify one
-	let no_device = body.inhibit_login
-		|| body
-			.appservice_info
-			.as_ref()
-			.is_some_and(|aps| aps.registration.device_management);
-	let (token, device) = if !no_device {
-		// Don't create a device for inhibited logins
-		let device_id = if is_guest { None } else { body.device_id.clone() }
-			.unwrap_or_else(|| utils::random_string(DEVICE_ID_LENGTH).into());
-
-		// Generate new token for the device
-		let new_token = utils::random_string(TOKEN_LENGTH);
-
-		// Create device for this account
-		services
-			.users
-			.create_device(
-				&user_id,
-				&device_id,
-				&new_token,
-				body.initial_device_display_name.clone(),
-				Some(client.to_string()),
-			)
-			.await?;
-		debug_info!(%user_id, %device_id, "User account was created");
-		(Some(new_token), Some(device_id))
-	} else {
-		(None, None)
-	};
-
-	let device_display_name = body.initial_device_display_name.as_deref().unwrap_or("");
-
-	// log in conduit admin channel if a non-guest user registered
-	if body.appservice_info.is_none() && !is_guest {
-		if !device_display_name.is_empty() {
-			let notice = format!(
-				"New user \"{user_id}\" registered on this server from IP {client} and device \
-				 display name \"{device_display_name}\""
-			);
-
-			info!("{notice}");
-			if services.server.config.admin_room_notices {
-				services.admin.notice(&notice).await;
-			}
-		} else {
-			let notice = format!("New user \"{user_id}\" registered on this server.");
-
-			info!("{notice}");
-			if services.server.config.admin_room_notices {
-				services.admin.notice(&notice).await;
-			}
-		}
-	}
-
-	// log in conduit admin channel if a guest registered
-	if body.appservice_info.is_none() && is_guest && services.config.log_guest_registrations {
-		debug_info!("New guest user \"{user_id}\" registered on this server.");
-
-		if !device_display_name.is_empty() {
-			if services.server.config.admin_room_notices {
-				services
-					.admin
-					.notice(&format!(
-						"Guest user \"{user_id}\" with device display name \
-						 \"{device_display_name}\" registered on this server from IP {client}"
-					))
-					.await;
-			}
-		} else {
-			#[allow(clippy::collapsible_else_if)]
-			if services.server.config.admin_room_notices {
-				services
-					.admin
-					.notice(&format!(
-						"Guest user \"{user_id}\" with no device display name registered on \
-						 this server from IP {client}",
-					))
-					.await;
-			}
-		}
-	}
-
-	if !is_guest {
-		// Make the first user to register an administrator and disable first-run mode.
-		let was_first_user = services.firstrun.empower_first_user(&user_id).await?;
-
-		// If the registering user was not the first and we're suspending users on
-		// register, suspend them.
-		if !was_first_user && services.config.suspend_on_register {
-			// Note that we can still do auto joins for suspended users
-			services
-				.users
-				.suspend_account(&user_id, &services.globals.server_user)
-				.await;
-			// And send an @room notice to the admin room, to prompt admins to review the
-			// new user and ideally unsuspend them if deemed appropriate.
-			if services.server.config.admin_room_notices {
-				services
-					.admin
-					.send_loud_message(RoomMessageEventContent::text_plain(format!(
-						"User {user_id} has been suspended as they are not the first user on \
-						 this server. Please review and unsuspend them if appropriate."
-					)))
-					.await
-					.ok();
-			}
-		}
-	}
-
-	if body.appservice_info.is_none()
-		&& !services.server.config.auto_join_rooms.is_empty()
-		&& (services.config.allow_guests_auto_join_rooms || !is_guest)
-	{
-		for room in &services.server.config.auto_join_rooms {
-			let Ok(room_id) = services.rooms.alias.resolve(room).await else {
-				error!(
-					"Failed to resolve room alias to room ID when attempting to auto join \
-					 {room}, skipping"
-				);
-				continue;
-			};
-
-			if !services
-				.rooms
-				.state_cache
-				.server_in_room(services.globals.server_name(), &room_id)
-				.await
-			{
-				warn!(
-					"Skipping room {room} to automatically join as we have never joined before."
-				);
-				continue;
-			}
-
-			if let Some(room_server_name) = room.server_name() {
-				match join_room_by_id_helper(
-					&services,
-					&user_id,
-					&room_id,
-					Some("Automatically joining this room upon registration".to_owned()),
-					&[services.globals.server_name().to_owned(), room_server_name.to_owned()],
-					&body.appservice_info,
-				)
-				.boxed()
-				.await
-				{
-					| Err(e) => {
-						// don't return this error so we don't fail registrations
-						error!(
-							"Failed to automatically join room {room} for user {user_id}: {e}"
-						);
-					},
-					| _ => {
-						info!("Automatically joined room {room} for user {user_id}");
-					},
-				}
-			}
-		}
-	}
-
-	Ok(register::v3::Response {
-		access_token: token,
-		user_id,
-		device_id: device,
-		refresh_token: None,
-		expires_in: None,
-	})
-}
-
-/// # `POST /_matrix/client/r0/account/password`
-///
-/// Changes the password of this account.
-///
-/// - Requires UIAA to verify user password
-/// - Changes the password of the sender user
-/// - The password hash is calculated using argon2 with 32 character salt, the
-///   plain password is
-/// not saved
-///
-/// If logout_devices is true it does the following for each device except the
-/// sender device:
-/// - Invalidates access token
-/// - Deletes device metadata (device id, device display name, last seen ip,
-///   last seen ts)
-/// - Forgets to-device events
-/// - Triggers device list updates
-#[tracing::instrument(skip_all, fields(%client), name = "change_password", level = "info")]
-pub(crate) async fn change_password_route(
-	State(services): State<crate::State>,
-	InsecureClientIp(client): InsecureClientIp,
-	body: Ruma<change_password::v3::Request>,
-) -> Result<change_password::v3::Response> {
-	// Authentication for this endpoint was made optional, but we need
-	// authentication currently
-	let sender_user = body
-		.sender_user
-		.as_ref()
-		.ok_or_else(|| err!(Request(MissingToken("Missing access token."))))?;
-
-	let mut uiaainfo = UiaaInfo {
-		flows: vec![AuthFlow { stages: vec![AuthType::Password] }],
-		completed: Vec::new(),
-		params: Box::default(),
-		session: None,
-		auth_error: None,
-	};
-
-	match &body.auth {
-		| Some(auth) => {
-			let (worked, uiaainfo) = services
-				.uiaa
-				.try_auth(sender_user, body.sender_device(), auth, &uiaainfo)
-				.await?;
-
-			if !worked {
-				return Err(Error::Uiaa(uiaainfo));
-			}
-
-			// Success!
-		},
-		| _ => match body.json_body {
-			| Some(ref json) => {
-				uiaainfo.session = Some(utils::random_string(SESSION_ID_LENGTH));
-				services
-					.uiaa
-					.create(sender_user, body.sender_device(), &uiaainfo, json);
-
-				return Err(Error::Uiaa(uiaainfo));
-			},
-			| _ => {
-				return Err!(Request(NotJson("JSON body is not valid")));
-			},
-		},
-	}
-
-	services
-		.users
-		.set_password(sender_user, Some(&body.new_password))
-		.await?;
-
-	if body.logout_devices {
-		// Logout all devices except the current one
-		services
-			.users
-			.all_device_ids(sender_user)
-			.ready_filter(|id| *id != body.sender_device())
-			.for_each(|id| services.users.remove_device(sender_user, id))
-			.await;
-
-		// Remove all pushers except the ones associated with this session
-		services
-			.pusher
-			.get_pushkeys(sender_user)
-			.map(ToOwned::to_owned)
-			.broad_filter_map(async |pushkey| {
-				services
-					.pusher
-					.get_pusher_device(&pushkey)
-					.await
-					.ok()
-					.filter(|pusher_device| pusher_device != body.sender_device())
-					.is_some()
-					.then_some(pushkey)
-			})
-			.for_each(async |pushkey| {
-				services.pusher.delete_pusher(sender_user, &pushkey).await;
-			})
-			.await;
-	}
-
-	info!("User {sender_user} changed their password.");
-
-	if services.server.config.admin_room_notices {
-		services
-			.admin
-			.notice(&format!("User {sender_user} changed their password."))
-			.await;
-	}
-
-	Ok(change_password::v3::Response {})
-}
-
-/// # `GET /_matrix/client/v3/account/whoami`
-///
-/// Get `user_id` of the sender user.
-///
-/// Note: Also works for Application Services
-pub(crate) async fn whoami_route(
-	State(services): State<crate::State>,
-	body: Ruma<whoami::v3::Request>,
-) -> Result<whoami::v3::Response> {
-	let is_guest = services
-		.users
-		.is_deactivated(body.sender_user())
-		.await
-		.map_err(|_| {
-			err!(Request(Forbidden("Application service has not registered this user.")))
-		})? && body.appservice_info.is_none();
-	Ok(whoami::v3::Response {
-		user_id: body.sender_user().to_owned(),
-		device_id: body.sender_device.clone(),
-		is_guest,
-	})
-}
-
-/// # `POST /_matrix/client/r0/account/deactivate`
-///
-/// Deactivate sender user account.
-///
-/// - Leaves all rooms and rejects all invitations
-/// - Invalidates all access tokens
-/// - Deletes all device metadata (device id, device display name, last seen ip,
-///   last seen ts)
-/// - Forgets all to-device events
-/// - Triggers device list updates
-/// - Removes ability to log in again
-#[tracing::instrument(skip_all, fields(%client), name = "deactivate", level = "info")]
-pub(crate) async fn deactivate_route(
-	State(services): State<crate::State>,
-	InsecureClientIp(client): InsecureClientIp,
-	body: Ruma<deactivate::v3::Request>,
-) -> Result<deactivate::v3::Response> {
-	// Authentication for this endpoint was made optional, but we need
-	// authentication currently
-	let sender_user = body
-		.sender_user
-		.as_ref()
-		.ok_or_else(|| err!(Request(MissingToken("Missing access token."))))?;
-
-	let mut uiaainfo = UiaaInfo {
-		flows: vec![AuthFlow { stages: vec![AuthType::Password] }],
-		completed: Vec::new(),
-		params: Box::default(),
-		session: None,
-		auth_error: None,
-	};
-
-	match &body.auth {
-		| Some(auth) => {
-			let (worked, uiaainfo) = services
-				.uiaa
-				.try_auth(sender_user, body.sender_device(), auth, &uiaainfo)
-				.await?;
-
-			if !worked {
-				return Err(Error::Uiaa(uiaainfo));
-			}
-			// Success!
-		},
-		| _ => match body.json_body {
-			| Some(ref json) => {
-				uiaainfo.session = Some(utils::random_string(SESSION_ID_LENGTH));
-				services
-					.uiaa
-					.create(sender_user, body.sender_device(), &uiaainfo, json);
-
-				return Err(Error::Uiaa(uiaainfo));
-			},
-			| _ => {
-				return Err!(Request(NotJson("JSON body is not valid")));
-			},
-		},
-	}
-
-	// Remove profile pictures and display name
-	let all_joined_rooms: Vec<OwnedRoomId> = services
-		.rooms
-		.state_cache
-		.rooms_joined(sender_user)
-		.map(Into::into)
-		.collect()
-		.await;
-
-	full_user_deactivate(&services, sender_user, &all_joined_rooms)
-		.boxed()
-		.await?;
-
-	info!("User {sender_user} deactivated their account.");
-
-	if services.server.config.admin_room_notices {
-		services
-			.admin
-			.notice(&format!("User {sender_user} deactivated their account."))
-			.await;
-	}
-
-	Ok(deactivate::v3::Response {
-		id_server_unbind_result: ThirdPartyIdRemovalStatus::NoSupport,
-	})
-}
-
-/// # `GET _matrix/client/v3/account/3pid`
-///
-/// Get a list of third party identifiers associated with this account.
-///
-/// - Currently always returns empty list
-pub(crate) async fn third_party_route(
-	body: Ruma<get_3pids::v3::Request>,
-) -> Result<get_3pids::v3::Response> {
-	let _sender_user = body.sender_user.as_ref().expect("user is authenticated");
-
-	Ok(get_3pids::v3::Response::new(Vec::new()))
-}
-
-/// # `POST /_matrix/client/v3/account/3pid/email/requestToken`
-///
-/// "This API should be used to request validation tokens when adding an email
-/// address to an account"
-///
-/// - 403 signals that The homeserver does not allow the third party identifier
-///   as a contact option.
-pub(crate) async fn request_3pid_management_token_via_email_route(
-	_body: Ruma<request_3pid_management_token_via_email::v3::Request>,
-) -> Result<request_3pid_management_token_via_email::v3::Response> {
-	Err!(Request(ThreepidDenied("Third party identifiers are not implemented")))
-}
-
-/// # `POST /_matrix/client/v3/account/3pid/msisdn/requestToken`
-///
-/// "This API should be used to request validation tokens when adding an phone
-/// number to an account"
-///
-/// - 403 signals that The homeserver does not allow the third party identifier
-///   as a contact option.
-pub(crate) async fn request_3pid_management_token_via_msisdn_route(
-	_body: Ruma<request_3pid_management_token_via_msisdn::v3::Request>,
-) -> Result<request_3pid_management_token_via_msisdn::v3::Response> {
-	Err!(Request(ThreepidDenied("Third party identifiers are not implemented")))
-}
-
-/// # `GET /_matrix/client/v1/register/m.login.registration_token/validity`
-///
-/// Checks if the provided registration token is valid at the time of checking.
-pub(crate) async fn check_registration_token_validity(
-	State(services): State<crate::State>,
-	body: Ruma<check_registration_token_validity::v1::Request>,
-) -> Result<check_registration_token_validity::v1::Response> {
-	// TODO: ratelimit this pretty heavily
-
-	let valid = services
-		.registration_tokens
-		.validate_token(body.token.clone())
-		.await
-		.is_some();
-
-	Ok(check_registration_token_validity::v1::Response { valid })
-}
-
-/// Runs through all the deactivation steps:
-///
-/// - Mark as deactivated
-/// - Removing display name
-/// - Removing avatar URL and blurhash
-/// - Removing all profile data
-/// - Leaving all rooms (and forgets all of them)
-pub async fn full_user_deactivate(
-	services: &Services,
-	user_id: &UserId,
-	all_joined_rooms: &[OwnedRoomId],
-) -> Result<()> {
-	services.users.deactivate_account(user_id).await.ok();
-
-	services
-		.users
-		.all_profile_keys(user_id)
-		.ready_for_each(|(profile_key, _)| {
-			services.users.set_profile_key(user_id, &profile_key, None);
-		})
-		.await;
-
-	// TODO: Rescind all user invites
-
-	let mut pdu_queue: Vec<(PduBuilder, &OwnedRoomId)> = Vec::new();
-
-	for room_id in all_joined_rooms {
-		let room_power_levels = services
-			.rooms
-			.state_accessor
-			.room_state_get_content::<RoomPowerLevelsEventContent>(
-				room_id,
-				&StateEventType::RoomPowerLevels,
-				"",
-			)
-			.await
-			.ok();
-
-		let user_can_demote_self =
-			room_power_levels
-				.as_ref()
-				.is_some_and(|power_levels_content| {
-					RoomPowerLevels::from(power_levels_content.clone())
-						.user_can_change_user_power_level(user_id, user_id)
-				}) || services
-				.rooms
-				.state_accessor
-				.room_state_get(room_id, &StateEventType::RoomCreate, "")
-				.await
-				.is_ok_and(|event| event.sender() == user_id);
-
-		if user_can_demote_self {
-			let mut power_levels_content = room_power_levels.unwrap_or_default();
-			power_levels_content.users.remove(user_id);
-			let pl_evt = PduBuilder::state(String::new(), &power_levels_content);
-			pdu_queue.push((pl_evt, room_id));
-		}
-
-		// Leave the room
-		pdu_queue.push((
-			PduBuilder::state(user_id.to_string(), &RoomMemberEventContent {
-				avatar_url: None,
-				blurhash: None,
-				membership: MembershipState::Leave,
-				displayname: None,
-				join_authorized_via_users_server: None,
-				reason: None,
-				is_direct: None,
-				third_party_invite: None,
-				redact_events: None,
-			}),
-			room_id,
-		));
-
-		// TODO: Redact all messages sent by the user in the room
-	}
-
-	super::update_all_rooms(services, pdu_queue, user_id).await;
-	for room_id in all_joined_rooms {
-		services.rooms.state_cache.forget(room_id, user_id);
-	}
-
-	Ok(())
-}
--- a/src/api/client/account/mod.rs
+++ b/src/api/client/account/mod.rs
@@ -0,0 +1,426 @@
+use axum::extract::State;
+use axum_client_ip::InsecureClientIp;
+use conduwuit::{
+	Err, Event, Result, err, info,
+	pdu::PduBuilder,
+	utils::{ReadyExt, stream::BroadbandExt},
+};
+use conduwuit_service::Services;
+use futures::{FutureExt, StreamExt};
+use lettre::{Address, message::Mailbox};
+use ruma::{
+	OwnedRoomId, OwnedUserId, UserId,
+	api::client::{
+		account::{
+			ThirdPartyIdRemovalStatus, change_password, check_registration_token_validity,
+			deactivate, get_username_availability, request_password_change_token_via_email,
+			whoami,
+		},
+		uiaa::{AuthFlow, AuthType},
+	},
+	events::{
+		StateEventType,
+		room::{
+			member::{MembershipState, RoomMemberEventContent},
+			power_levels::{RoomPowerLevels, RoomPowerLevelsEventContent},
+		},
+	},
+};
+use service::{mailer::messages, uiaa::Identity};
+
+use super::{DEVICE_ID_LENGTH, TOKEN_LENGTH, join_room_by_id_helper};
+use crate::Ruma;
+
+pub(crate) mod register;
+pub(crate) mod threepid;
+
+/// # `GET /_matrix/client/v3/register/available`
+///
+/// Checks if a username is valid and available on this server.
+///
+/// Conditions for returning true:
+/// - The user id is not historical
+/// - The server name of the user id matches this server
+/// - No user or appservice on this server already claimed this username
+///
+/// Note: This will not reserve the username, so the username might become
+/// invalid when trying to register
+#[tracing::instrument(skip_all, fields(%client), name = "register_available", level = "info")]
+pub(crate) async fn get_register_available_route(
+	State(services): State<crate::State>,
+	InsecureClientIp(client): InsecureClientIp,
+	body: Ruma<get_username_availability::v3::Request>,
+) -> Result<get_username_availability::v3::Response> {
+	// Validate user id
+	let user_id =
+		match UserId::parse_with_server_name(&body.username, services.globals.server_name()) {
+			| Ok(user_id) => {
+				if let Err(e) = user_id.validate_strict() {
+					return Err!(Request(InvalidUsername(debug_warn!(
+						"Username {} contains disallowed characters or spaces: {e}",
+						body.username
+					))));
+				}
+
+				user_id
+			},
+			| Err(e) => {
+				return Err!(Request(InvalidUsername(debug_warn!(
+					"Username {} is not valid: {e}",
+					body.username
+				))));
+			},
+		};
+
+	// Check if username is creative enough
+	if services.users.exists(&user_id).await {
+		return Err!(Request(UserInUse("User ID is not available.")));
+	}
+
+	if let Some(ref info) = body.appservice_info {
+		if !info.is_user_match(&user_id) {
+			return Err!(Request(Exclusive("Username is not in an appservice namespace.")));
+		}
+	}
+
+	if services.appservice.is_exclusive_user_id(&user_id).await {
+		return Err!(Request(Exclusive("Username is reserved by an appservice.")));
+	}
+
+	Ok(get_username_availability::v3::Response { available: true })
+}
+
+/// # `POST /_matrix/client/r0/account/password`
+///
+/// Changes the password of this account.
+///
+/// - Requires UIAA to verify user password
+/// - Changes the password of the sender user
+/// - The password hash is calculated using argon2 with 32 character salt, the
+///   plain password is
+/// not saved
+///
+/// If logout_devices is true it does the following for each device except the
+/// sender device:
+/// - Invalidates access token
+/// - Deletes device metadata (device id, device display name, last seen ip,
+///   last seen ts)
+/// - Forgets to-device events
+/// - Triggers device list updates
+#[tracing::instrument(skip_all, fields(%client), name = "change_password", level = "info")]
+pub(crate) async fn change_password_route(
+	State(services): State<crate::State>,
+	InsecureClientIp(client): InsecureClientIp,
+	body: Ruma<change_password::v3::Request>,
+) -> Result<change_password::v3::Response> {
+	let identity = if let Some(ref user_id) = body.sender_user {
+		// A signed-in user is trying to change their password, prompt them for their
+		// existing one
+
+		services
+			.uiaa
+			.authenticate(
+				&body.auth,
+				vec![AuthFlow::new(vec![AuthType::Password])],
+				Box::default(),
+				Some(Identity::from_user_id(user_id)),
+			)
+			.await?
+	} else {
+		// A signed-out user is trying to reset their password, prompt them for email
+		// confirmation. Note that we do not _send_ an email here, their client should
+		// have already hit `/account/password/requestToken` to send the email. We
+		// just validate it.
+
+		services
+			.uiaa
+			.authenticate(
+				&body.auth,
+				vec![AuthFlow::new(vec![AuthType::EmailIdentity])],
+				Box::default(),
+				None,
+			)
+			.await?
+	};
+
+	let sender_user = OwnedUserId::parse(format!(
+		"@{}:{}",
+		identity.localpart.expect("localpart should be known"),
+		services.globals.server_name()
+	))
+	.expect("user ID should be valid");
+
+	services
+		.users
+		.set_password(&sender_user, Some(&body.new_password))
+		.await?;
+
+	if body.logout_devices {
+		// Logout all devices except the current one
+		services
+			.users
+			.all_device_ids(&sender_user)
+			.ready_filter(|id| *id != body.sender_device())
+			.for_each(|id| services.users.remove_device(&sender_user, id))
+			.await;
+
+		// Remove all pushers except the ones associated with this session
+		services
+			.pusher
+			.get_pushkeys(&sender_user)
+			.map(ToOwned::to_owned)
+			.broad_filter_map(async |pushkey| {
+				services
+					.pusher
+					.get_pusher_device(&pushkey)
+					.await
+					.ok()
+					.filter(|pusher_device| pusher_device != body.sender_device())
+					.is_some()
+					.then_some(pushkey)
+			})
+			.for_each(async |pushkey| {
+				services.pusher.delete_pusher(&sender_user, &pushkey).await;
+			})
+			.await;
+	}
+
+	info!("User {} changed their password.", &sender_user);
+
+	if services.server.config.admin_room_notices {
+		services
+			.admin
+			.notice(&format!("User {} changed their password.", &sender_user))
+			.await;
+	}
+
+	Ok(change_password::v3::Response {})
+}
+
+/// # `POST /_matrix/client/v3/account/password/email/requestToken`
+///
+/// Requests a validation email for the purpose of resetting a user's password.
+pub(crate) async fn request_password_change_token_via_email_route(
+	State(services): State<crate::State>,
+	body: Ruma<request_password_change_token_via_email::v3::Request>,
+) -> Result<request_password_change_token_via_email::v3::Response> {
+	let Ok(email) = Address::try_from(body.email.clone()) else {
+		return Err!(Request(InvalidParam("Invalid email address.")));
+	};
+
+	let Some(localpart) = services.threepid.get_localpart_for_email(&email).await else {
+		return Err!(Request(ThreepidNotFound(
+			"No account is associated with this email address"
+		)));
+	};
+
+	let user_id =
+		OwnedUserId::parse(format!("@{localpart}:{}", services.globals.server_name())).unwrap();
+	let display_name = services.users.displayname(&user_id).await.ok();
+
+	let session = services
+		.threepid
+		.send_validation_email(
+			Mailbox::new(display_name.clone(), email),
+			|verification_link| messages::PasswordReset {
+				display_name: display_name.as_deref(),
+				user_id: &user_id,
+				verification_link,
+			},
+			&body.client_secret,
+			body.send_attempt.try_into().unwrap(),
+		)
+		.await?;
+
+	Ok(request_password_change_token_via_email::v3::Response::new(session))
+}
+
+/// # `GET /_matrix/client/v3/account/whoami`
+///
+/// Get `user_id` of the sender user.
+///
+/// Note: Also works for Application Services
+pub(crate) async fn whoami_route(
+	State(services): State<crate::State>,
+	body: Ruma<whoami::v3::Request>,
+) -> Result<whoami::v3::Response> {
+	let is_guest = services
+		.users
+		.is_deactivated(body.sender_user())
+		.await
+		.map_err(|_| {
+			err!(Request(Forbidden("Application service has not registered this user.")))
+		})? && body.appservice_info.is_none();
+	Ok(whoami::v3::Response {
+		user_id: body.sender_user().to_owned(),
+		device_id: body.sender_device.clone(),
+		is_guest,
+	})
+}
+
+/// # `POST /_matrix/client/r0/account/deactivate`
+///
+/// Deactivate sender user account.
+///
+/// - Leaves all rooms and rejects all invitations
+/// - Invalidates all access tokens
+/// - Deletes all device metadata (device id, device display name, last seen ip,
+///   last seen ts)
+/// - Forgets all to-device events
+/// - Triggers device list updates
+/// - Removes ability to log in again
+#[tracing::instrument(skip_all, fields(%client), name = "deactivate", level = "info")]
+pub(crate) async fn deactivate_route(
+	State(services): State<crate::State>,
+	InsecureClientIp(client): InsecureClientIp,
+	body: Ruma<deactivate::v3::Request>,
+) -> Result<deactivate::v3::Response> {
+	// Authentication for this endpoint is technically optional,
+	// but we require the user to be logged in
+	let sender_user = body
+		.sender_user
+		.as_ref()
+		.ok_or_else(|| err!(Request(MissingToken("Missing access token."))))?;
+
+	// Prompt the user to confirm with their password using UIAA
+	let _ = services
+		.uiaa
+		.authenticate_password(&body.auth, Some(Identity::from_user_id(sender_user)))
+		.await?;
+
+	// Remove profile pictures and display name
+	let all_joined_rooms: Vec<OwnedRoomId> = services
+		.rooms
+		.state_cache
+		.rooms_joined(sender_user)
+		.map(Into::into)
+		.collect()
+		.await;
+
+	full_user_deactivate(&services, sender_user, &all_joined_rooms)
+		.boxed()
+		.await?;
+
+	info!("User {sender_user} deactivated their account.");
+
+	if services.server.config.admin_room_notices {
+		services
+			.admin
+			.notice(&format!("User {sender_user} deactivated their account."))
+			.await;
+	}
+
+	Ok(deactivate::v3::Response {
+		id_server_unbind_result: ThirdPartyIdRemovalStatus::Success,
+	})
+}
+
+/// # `GET /_matrix/client/v1/register/m.login.registration_token/validity`
+///
+/// Checks if the provided registration token is valid at the time of checking.
+pub(crate) async fn check_registration_token_validity(
+	State(services): State<crate::State>,
+	body: Ruma<check_registration_token_validity::v1::Request>,
+) -> Result<check_registration_token_validity::v1::Response> {
+	// TODO: ratelimit this pretty heavily
+
+	let valid = services
+		.registration_tokens
+		.validate_token(body.token.clone())
+		.await
+		.is_some();
+
+	Ok(check_registration_token_validity::v1::Response { valid })
+}
+
+/// Runs through all the deactivation steps:
+///
+/// - Mark as deactivated
+/// - Removing display name
+/// - Removing avatar URL and blurhash
+/// - Removing all profile data
+/// - Leaving all rooms (and forgets all of them)
+pub async fn full_user_deactivate(
+	services: &Services,
+	user_id: &UserId,
+	all_joined_rooms: &[OwnedRoomId],
+) -> Result<()> {
+	services.users.deactivate_account(user_id).await.ok();
+
+	if services.globals.user_is_local(user_id) {
+		let _ = services
+			.threepid
+			.disassociate_localpart_email(user_id.localpart())
+			.await;
+	}
+
+	services
+		.users
+		.all_profile_keys(user_id)
+		.ready_for_each(|(profile_key, _)| {
+			services.users.set_profile_key(user_id, &profile_key, None);
+		})
+		.await;
+
+	// TODO: Rescind all user invites
+
+	let mut pdu_queue: Vec<(PduBuilder, &OwnedRoomId)> = Vec::new();
+
+	for room_id in all_joined_rooms {
+		let room_power_levels = services
+			.rooms
+			.state_accessor
+			.room_state_get_content::<RoomPowerLevelsEventContent>(
+				room_id,
+				&StateEventType::RoomPowerLevels,
+				"",
+			)
+			.await
+			.ok();
+
+		let user_can_demote_self =
+			room_power_levels
+				.as_ref()
+				.is_some_and(|power_levels_content| {
+					RoomPowerLevels::from(power_levels_content.clone())
+						.user_can_change_user_power_level(user_id, user_id)
+				}) || services
+				.rooms
+				.state_accessor
+				.room_state_get(room_id, &StateEventType::RoomCreate, "")
+				.await
+				.is_ok_and(|event| event.sender() == user_id);
+
+		if user_can_demote_self {
+			let mut power_levels_content = room_power_levels.unwrap_or_default();
+			power_levels_content.users.remove(user_id);
+			let pl_evt = PduBuilder::state(String::new(), &power_levels_content);
+			pdu_queue.push((pl_evt, room_id));
+		}
+
+		// Leave the room
+		pdu_queue.push((
+			PduBuilder::state(user_id.to_string(), &RoomMemberEventContent {
+				avatar_url: None,
+				blurhash: None,
+				membership: MembershipState::Leave,
+				displayname: None,
+				join_authorized_via_users_server: None,
+				reason: None,
+				is_direct: None,
+				third_party_invite: None,
+				redact_events: None,
+			}),
+			room_id,
+		));
+
+		// TODO: Redact all messages sent by the user in the room
+	}
+
+	super::update_all_rooms(services, pdu_queue, user_id).await;
+	for room_id in all_joined_rooms {
+		services.rooms.state_cache.forget(room_id, user_id);
+	}
+
+	Ok(())
+}
--- a/src/api/client/account/register.rs
+++ b/src/api/client/account/register.rs
@@ -0,0 +1,601 @@
+use std::{collections::HashMap, fmt::Write};
+
+use axum::extract::State;
+use axum_client_ip::InsecureClientIp;
+use conduwuit::{
+	Err, Result, debug_info, error, info,
+	utils::{self},
+	warn,
+};
+use conduwuit_service::Services;
+use futures::{FutureExt, StreamExt};
+use lettre::{Address, message::Mailbox};
+use register::RegistrationKind;
+use ruma::{
+	OwnedUserId, UserId,
+	api::client::{
+		account::{
+			register::{self, LoginType},
+			request_registration_token_via_email,
+		},
+		uiaa::{AuthFlow, AuthType},
+	},
+	events::{GlobalAccountDataEventType, room::message::RoomMessageEventContent},
+	push,
+};
+use serde_json::value::RawValue;
+use service::mailer::messages;
+
+use super::{DEVICE_ID_LENGTH, TOKEN_LENGTH, join_room_by_id_helper};
+use crate::Ruma;
+
+const RANDOM_USER_ID_LENGTH: usize = 10;
+
+/// # `POST /_matrix/client/v3/register`
+///
+/// Register an account on this homeserver.
+///
+/// You can use [`GET
+/// /_matrix/client/v3/register/available`](fn.get_register_available_route.
+/// html) to check if the user id is valid and available.
+///
+/// - Only works if registration is enabled
+/// - If type is guest: ignores all parameters except
+///   initial_device_display_name
+/// - If sender is not appservice: Requires UIAA (but we only use a dummy stage)
+/// - If type is not guest and no username is given: Always fails after UIAA
+///   check
+/// - Creates a new account and populates it with default account data
+/// - If `inhibit_login` is false: Creates a device and returns device id and
+///   access_token
+#[allow(clippy::doc_markdown)]
+#[tracing::instrument(skip_all, fields(%client), name = "register", level = "info")]
+pub(crate) async fn register_route(
+	State(services): State<crate::State>,
+	InsecureClientIp(client): InsecureClientIp,
+	body: Ruma<register::v3::Request>,
+) -> Result<register::v3::Response> {
+	let is_guest = body.kind == RegistrationKind::Guest;
+	let emergency_mode_enabled = services.config.emergency_password.is_some();
+
+	// Allow registration if it's enabled in the config file or if this is the first
+	// run (so the first user account can be created)
+	let allow_registration =
+		services.config.allow_registration || services.firstrun.is_first_run();
+
+	if !allow_registration && body.appservice_info.is_none() {
+		match (body.username.as_ref(), body.initial_device_display_name.as_ref()) {
+			| (Some(username), Some(device_display_name)) => {
+				info!(
+					%is_guest,
+					user = %username,
+					device_name = %device_display_name,
+					"Rejecting registration attempt as registration is disabled"
+				);
+			},
+			| (Some(username), _) => {
+				info!(
+					%is_guest,
+					user = %username,
+					"Rejecting registration attempt as registration is disabled"
+				);
+			},
+			| (_, Some(device_display_name)) => {
+				info!(
+					%is_guest,
+					device_name = %device_display_name,
+					"Rejecting registration attempt as registration is disabled"
+				);
+			},
+			| (None, _) => {
+				info!(
+					%is_guest,
+					"Rejecting registration attempt as registration is disabled"
+				);
+			},
+		}
+
+		return Err!(Request(Forbidden(
+			"This server is not accepting registrations at this time."
+		)));
+	}
+
+	if is_guest && !services.config.allow_guest_registration {
+		info!(
+			"Guest registration disabled, rejecting guest registration attempt, initial device \
+			 name: \"{}\"",
+			body.initial_device_display_name.as_deref().unwrap_or("")
+		);
+		return Err!(Request(GuestAccessForbidden("Guest registration is disabled.")));
+	}
+
+	// forbid guests from registering if there is not a real admin user yet. give
+	// generic user error.
+	if is_guest && services.firstrun.is_first_run() {
+		warn!(
+			"Guest account attempted to register before a real admin user has been registered, \
+			 rejecting registration. Guest's initial device name: \"{}\"",
+			body.initial_device_display_name.as_deref().unwrap_or("")
+		);
+		return Err!(Request(Forbidden(
+			"This server is not accepting registrations at this time."
+		)));
+	}
+
+	// Appeservices and guests get to skip auth
+	let skip_auth = body.appservice_info.is_some() || is_guest;
+
+	let identity = if skip_auth {
+		// Appservices and guests have no identity
+		None
+	} else {
+		// Perform UIAA to determine the user's identity
+		let (flows, params) = create_registration_uiaa_session(&services).await?;
+
+		Some(
+			services
+				.uiaa
+				.authenticate(&body.auth, flows, params, None)
+				.await?,
+		)
+	};
+
+	// If the user didn't supply a username but did supply an email, use
+	// the email's user as their initial localpart to avoid falling back to
+	// a randomly generated localpart
+	let supplied_username = body.username.clone().or_else(|| {
+		if let Some(identity) = &identity
+			&& let Some(email) = &identity.email
+		{
+			Some(email.user().to_owned())
+		} else {
+			None
+		}
+	});
+
+	let user_id = determine_registration_user_id(
+		&services,
+		supplied_username,
+		is_guest,
+		emergency_mode_enabled,
+	)
+	.await?;
+
+	if body.body.login_type == Some(LoginType::ApplicationService) {
+		// For appservice logins, make sure that the user ID is in the appservice's
+		// namespace
+
+		match body.appservice_info {
+			| Some(ref info) =>
+				if !info.is_user_match(&user_id) && !emergency_mode_enabled {
+					return Err!(Request(Exclusive(
+						"Username is not in an appservice namespace."
+					)));
+				},
+			| _ => {
+				return Err!(Request(MissingToken("Missing appservice token.")));
+			},
+		}
+	} else if services.appservice.is_exclusive_user_id(&user_id).await && !emergency_mode_enabled
+	{
+		// For non-appservice logins, ban user IDs which are in an appservice's
+		// namespace (unless emergency mode is enabled)
+		return Err!(Request(Exclusive("Username is reserved by an appservice.")));
+	}
+
+	let password = if is_guest { None } else { body.password.as_deref() };
+
+	// Create user
+	services.users.create(&user_id, password, None).await?;
+
+	// Set an initial display name
+	let mut displayname = user_id.localpart().to_owned();
+
+	// Apply the new user displayname suffix, if it's set
+	if !services.globals.new_user_displayname_suffix().is_empty()
+		&& body.appservice_info.is_none()
+	{
+		write!(displayname, " {}", services.server.config.new_user_displayname_suffix)?;
+	}
+
+	services
+		.users
+		.set_displayname(&user_id, Some(displayname.clone()));
+
+	// Initial account data
+	services
+		.account_data
+		.update(
+			None,
+			&user_id,
+			GlobalAccountDataEventType::PushRules.to_string().into(),
+			&serde_json::to_value(ruma::events::push_rules::PushRulesEvent {
+				content: ruma::events::push_rules::PushRulesEventContent {
+					global: push::Ruleset::server_default(&user_id),
+				},
+			})?,
+		)
+		.await?;
+
+	// Generate new device id if the user didn't specify one
+	let no_device = body.inhibit_login
+		|| body
+			.appservice_info
+			.as_ref()
+			.is_some_and(|aps| aps.registration.device_management);
+
+	let (token, device) = if !no_device {
+		// Don't create a device for inhibited logins
+		let device_id = if is_guest { None } else { body.device_id.clone() }
+			.unwrap_or_else(|| utils::random_string(DEVICE_ID_LENGTH).into());
+
+		// Generate new token for the device
+		let new_token = utils::random_string(TOKEN_LENGTH);
+
+		// Create device for this account
+		services
+			.users
+			.create_device(
+				&user_id,
+				&device_id,
+				&new_token,
+				body.initial_device_display_name.clone(),
+				Some(client.to_string()),
+			)
+			.await?;
+		debug_info!(%user_id, %device_id, "User account was created");
+		(Some(new_token), Some(device_id))
+	} else {
+		(None, None)
+	};
+
+	// If the user registered with an email, associate it with their account.
+	if let Some(identity) = identity
+		&& let Some(email) = identity.email
+	{
+		// This may fail if the email is already in use, but we already check for that
+		// in `/requestToken`, so ignoring the error is acceptable here in the rare case
+		// that an email is sniped by another user between the `/requestToken` request
+		// and the `/register` request.
+		let _ = services
+			.threepid
+			.associate_localpart_email(user_id.localpart(), &email)
+			.await;
+	}
+
+	let device_display_name = body.initial_device_display_name.as_deref().unwrap_or("");
+
+	// log in conduit admin channel if a non-guest user registered
+	if body.appservice_info.is_none() && !is_guest {
+		if !device_display_name.is_empty() {
+			let notice = format!(
+				"New user \"{user_id}\" registered on this server from IP {client} and device \
+				 display name \"{device_display_name}\""
+			);
+
+			info!("{notice}");
+			if services.server.config.admin_room_notices {
+				services.admin.notice(&notice).await;
+			}
+		} else {
+			let notice = format!("New user \"{user_id}\" registered on this server.");
+
+			info!("{notice}");
+			if services.server.config.admin_room_notices {
+				services.admin.notice(&notice).await;
+			}
+		}
+	}
+
+	// log in conduit admin channel if a guest registered
+	if body.appservice_info.is_none() && is_guest && services.config.log_guest_registrations {
+		debug_info!("New guest user \"{user_id}\" registered on this server.");
+
+		if !device_display_name.is_empty() {
+			if services.server.config.admin_room_notices {
+				services
+					.admin
+					.notice(&format!(
+						"Guest user \"{user_id}\" with device display name \
+						 \"{device_display_name}\" registered on this server from IP {client}"
+					))
+					.await;
+			}
+		} else {
+			#[allow(clippy::collapsible_else_if)]
+			if services.server.config.admin_room_notices {
+				services
+					.admin
+					.notice(&format!(
+						"Guest user \"{user_id}\" with no device display name registered on \
+						 this server from IP {client}",
+					))
+					.await;
+			}
+		}
+	}
+
+	if !is_guest {
+		// Make the first user to register an administrator and disable first-run mode.
+		let was_first_user = services.firstrun.empower_first_user(&user_id).await?;
+
+		// If the registering user was not the first and we're suspending users on
+		// register, suspend them.
+		if !was_first_user && services.config.suspend_on_register {
+			// Note that we can still do auto joins for suspended users
+			services
+				.users
+				.suspend_account(&user_id, &services.globals.server_user)
+				.await;
+			// And send an @room notice to the admin room, to prompt admins to review the
+			// new user and ideally unsuspend them if deemed appropriate.
+			if services.server.config.admin_room_notices {
+				services
+					.admin
+					.send_loud_message(RoomMessageEventContent::text_plain(format!(
+						"User {user_id} has been suspended as they are not the first user on \
+						 this server. Please review and unsuspend them if appropriate."
+					)))
+					.await
+					.ok();
+			}
+		}
+	}
+
+	if body.appservice_info.is_none()
+		&& !services.server.config.auto_join_rooms.is_empty()
+		&& (services.config.allow_guests_auto_join_rooms || !is_guest)
+	{
+		for room in &services.server.config.auto_join_rooms {
+			let Ok(room_id) = services.rooms.alias.resolve(room).await else {
+				error!(
+					"Failed to resolve room alias to room ID when attempting to auto join \
+					 {room}, skipping"
+				);
+				continue;
+			};
+
+			if !services
+				.rooms
+				.state_cache
+				.server_in_room(services.globals.server_name(), &room_id)
+				.await
+			{
+				warn!(
+					"Skipping room {room} to automatically join as we have never joined before."
+				);
+				continue;
+			}
+
+			if let Some(room_server_name) = room.server_name() {
+				match join_room_by_id_helper(
+					&services,
+					&user_id,
+					&room_id,
+					Some("Automatically joining this room upon registration".to_owned()),
+					&[services.globals.server_name().to_owned(), room_server_name.to_owned()],
+					&body.appservice_info,
+				)
+				.boxed()
+				.await
+				{
+					| Err(e) => {
+						// don't return this error so we don't fail registrations
+						error!(
+							"Failed to automatically join room {room} for user {user_id}: {e}"
+						);
+					},
+					| _ => {
+						info!("Automatically joined room {room} for user {user_id}");
+					},
+				}
+			}
+		}
+	}
+
+	Ok(register::v3::Response {
+		access_token: token,
+		user_id,
+		device_id: device,
+		refresh_token: None,
+		expires_in: None,
+	})
+}
+
+/// Determine which flows and parameters should be presented when
+/// registering a new account.
+async fn create_registration_uiaa_session(
+	services: &Services,
+) -> Result<(Vec<AuthFlow>, Box<RawValue>)> {
+	let mut params = HashMap::<String, serde_json::Value>::new();
+
+	let flows = if services.firstrun.is_first_run() {
+		// Registration token forced while in first-run mode
+		vec![AuthFlow::new(vec![AuthType::RegistrationToken])]
+	} else {
+		let mut flows = vec![];
+
+		if services
+			.registration_tokens
+			.iterate_tokens()
+			.next()
+			.await
+			.is_some()
+		{
+			// Trusted registration flow with a token is available
+			let mut token_flow = AuthFlow::new(vec![AuthType::RegistrationToken]);
+
+			if let Some(smtp) = &services.config.smtp
+				&& smtp.require_email_for_token_registration
+			{
+				// Email is required for token registrations
+				token_flow.stages.push(AuthType::EmailIdentity);
+			}
+
+			flows.push(token_flow);
+		}
+
+		let mut untrusted_flow = AuthFlow::default();
+
+		if services.config.recaptcha_private_site_key.is_some() {
+			if let Some(pubkey) = &services.config.recaptcha_site_key {
+				// ReCaptcha is configured for untrusted registrations
+				untrusted_flow.stages.push(AuthType::ReCaptcha);
+
+				params.insert(
+					AuthType::ReCaptcha.as_str().to_owned(),
+					serde_json::json!({
+						"public_key": pubkey,
+					}),
+				);
+			}
+		}
+
+		if let Some(smtp) = &services.config.smtp
+			&& smtp.require_email_for_registration
+		{
+			// Email is required for untrusted registrations
+			untrusted_flow.stages.push(AuthType::EmailIdentity);
+		}
+
+		if !untrusted_flow.stages.is_empty() {
+			flows.push(untrusted_flow);
+		}
+
+		if flows.is_empty() {
+			// No flows are configured. Bail out by default
+			// unless open registration was explicitly enabled.
+			if !services
+				.config
+				.yes_i_am_very_very_sure_i_want_an_open_registration_server_prone_to_abuse
+			{
+				return Err!(Request(Forbidden(
+					"This server is not accepting registrations at this time."
+				)));
+			}
+
+			// We have open registration enabled (😧), provide a dummy flow
+			flows.push(AuthFlow::new(vec![AuthType::Dummy]));
+		}
+
+		flows
+	};
+
+	let params = serde_json::value::to_raw_value(&params).expect("params should be valid JSON");
+
+	Ok((flows, params))
+}
+
+async fn determine_registration_user_id(
+	services: &Services,
+	supplied_username: Option<String>,
+	is_guest: bool,
+	emergency_mode_enabled: bool,
+) -> Result<OwnedUserId> {
+	if let Some(supplied_username) = supplied_username
+		&& !is_guest
+	{
+		// The user gets to pick their username. Do some validation to make sure it's
+		// acceptable.
+
+		// Don't allow registration with forbidden usernames.
+		if services
+			.globals
+			.forbidden_usernames()
+			.is_match(&supplied_username)
+			&& !emergency_mode_enabled
+		{
+			return Err!(Request(Forbidden("Username is forbidden")));
+		}
+
+		// Create and validate the user ID
+		let user_id = match UserId::parse_with_server_name(
+			&supplied_username,
+			services.globals.server_name(),
+		) {
+			| Ok(user_id) => {
+				if let Err(e) = user_id.validate_strict() {
+					// Unless we are in emergency mode, we should follow synapse's behaviour on
+					// not allowing things like spaces and UTF-8 characters in usernames
+					if !emergency_mode_enabled {
+						return Err!(Request(InvalidUsername(debug_warn!(
+							"Username {supplied_username} contains disallowed characters or \
+							 spaces: {e}"
+						))));
+					}
+				}
+
+				// Don't allow registration with user IDs that aren't local
+				if !services.globals.user_is_local(&user_id) {
+					return Err!(Request(InvalidUsername(
+						"Username {supplied_username} is not local to this server"
+					)));
+				}
+
+				user_id
+			},
+			| Err(e) => {
+				return Err!(Request(InvalidUsername(debug_warn!(
+					"Username {supplied_username} is not valid: {e}"
+				))));
+			},
+		};
+
+		if services.users.exists(&user_id).await {
+			return Err!(Request(UserInUse("User ID is not available.")));
+		}
+
+		Ok(user_id)
+	} else {
+		// The user is a guest or didn't specify a username. Generate a username for
+		// them.
+
+		loop {
+			let user_id = UserId::parse_with_server_name(
+				utils::random_string(RANDOM_USER_ID_LENGTH).to_lowercase(),
+				services.globals.server_name(),
+			)
+			.unwrap();
+
+			if !services.users.exists(&user_id).await {
+				break Ok(user_id);
+			}
+		}
+	}
+}
+
+/// # `POST /_matrix/client/v3/register/email/requestToken`
+///
+/// Requests a validation email for the purpose of registering a new account.
+pub(crate) async fn request_registration_token_via_email_route(
+	State(services): State<crate::State>,
+	body: Ruma<request_registration_token_via_email::v3::Request>,
+) -> Result<request_registration_token_via_email::v3::Response> {
+	let Ok(email) = Address::try_from(body.email.clone()) else {
+		return Err!(Request(InvalidParam("Invalid email address.")));
+	};
+
+	if services
+		.threepid
+		.get_localpart_for_email(&email)
+		.await
+		.is_some()
+	{
+		return Err!(Request(ThreepidInUse("This email address is already in use.")));
+	}
+
+	let session = services
+		.threepid
+		.send_validation_email(
+			Mailbox::new(None, email),
+			|verification_link| messages::NewAccount {
+				server_name: services.config.server_name.as_ref(),
+				verification_link,
+			},
+			&body.client_secret,
+			body.send_attempt.try_into().unwrap(),
+		)
+		.await?;
+
+	Ok(request_registration_token_via_email::v3::Response::new(session))
+}
--- a/src/api/client/account/threepid.rs
+++ b/src/api/client/account/threepid.rs
@@ -0,0 +1,153 @@
+use std::time::SystemTime;
+
+use axum::extract::State;
+use conduwuit::{Err, Result, err};
+use lettre::{Address, message::Mailbox};
+use ruma::{
+	MilliSecondsSinceUnixEpoch,
+	api::client::account::{
+		ThirdPartyIdRemovalStatus, add_3pid, delete_3pid, get_3pids,
+		request_3pid_management_token_via_email, request_3pid_management_token_via_msisdn,
+	},
+	thirdparty::{Medium, ThirdPartyIdentifierInit},
+};
+use service::{mailer::messages, uiaa::Identity};
+
+use crate::Ruma;
+
+/// # `GET _matrix/client/v3/account/3pid`
+///
+/// Get a list of third party identifiers associated with this account.
+pub(crate) async fn third_party_route(
+	State(services): State<crate::State>,
+	body: Ruma<get_3pids::v3::Request>,
+) -> Result<get_3pids::v3::Response> {
+	let sender_user = body.sender_user();
+	let mut threepids = vec![];
+
+	if let Some(email) = services
+		.threepid
+		.get_email_for_localpart(sender_user.localpart())
+		.await
+	{
+		threepids.push(
+			ThirdPartyIdentifierInit {
+				address: email.to_string(),
+				medium: Medium::Email,
+				// We don't currently track these, and they aren't used for much
+				validated_at: MilliSecondsSinceUnixEpoch::now(),
+				added_at: MilliSecondsSinceUnixEpoch::from_system_time(SystemTime::UNIX_EPOCH)
+					.unwrap(),
+			}
+			.into(),
+		);
+	}
+
+	Ok(get_3pids::v3::Response::new(threepids))
+}
+
+/// # `POST /_matrix/client/v3/account/3pid/email/requestToken`
+///
+/// Requests a validation email for the purpose of changing an account's email.
+pub(crate) async fn request_3pid_management_token_via_email_route(
+	State(services): State<crate::State>,
+	body: Ruma<request_3pid_management_token_via_email::v3::Request>,
+) -> Result<request_3pid_management_token_via_email::v3::Response> {
+	let Ok(email) = Address::try_from(body.email.clone()) else {
+		return Err!(Request(InvalidParam("Invalid email address.")));
+	};
+
+	if services
+		.threepid
+		.get_localpart_for_email(&email)
+		.await
+		.is_some()
+	{
+		return Err!(Request(ThreepidInUse("This email address is already in use.")));
+	}
+
+	let session = services
+		.threepid
+		.send_validation_email(
+			Mailbox::new(None, email),
+			|verification_link| messages::ChangeEmail {
+				server_name: services.config.server_name.as_str(),
+				user_id: body.sender_user.as_deref(),
+				verification_link,
+			},
+			&body.client_secret,
+			body.send_attempt.try_into().unwrap(),
+		)
+		.await?;
+
+	Ok(request_3pid_management_token_via_email::v3::Response::new(session))
+}
+
+/// # `POST /_matrix/client/v3/account/3pid/msisdn/requestToken`
+///
+/// "This API should be used to request validation tokens when adding an email
+/// address to an account"
+///
+/// - 403 signals that The homeserver does not allow the third party identifier
+///   as a contact option.
+pub(crate) async fn request_3pid_management_token_via_msisdn_route(
+	_body: Ruma<request_3pid_management_token_via_msisdn::v3::Request>,
+) -> Result<request_3pid_management_token_via_msisdn::v3::Response> {
+	Err!(Request(ThreepidMediumNotSupported(
+		"MSISDN third-party identifiers are not supported."
+	)))
+}
+
+/// # `POST /_matrix/client/v3/account/3pid/add`
+pub(crate) async fn add_3pid_route(
+	State(services): State<crate::State>,
+	body: Ruma<add_3pid::v3::Request>,
+) -> Result<add_3pid::v3::Response> {
+	let sender_user = body.sender_user();
+
+	// Require password auth to add an email
+	let _ = services
+		.uiaa
+		.authenticate_password(&body.auth, Some(Identity::from_user_id(sender_user)))
+		.await?;
+
+	let email = services
+		.threepid
+		.consume_valid_session(&body.sid, &body.client_secret)
+		.await
+		.map_err(|message| err!(Request(ThreepidAuthFailed("{message}"))))?;
+
+	services
+		.threepid
+		.associate_localpart_email(sender_user.localpart(), &email)
+		.await?;
+
+	Ok(add_3pid::v3::Response::new())
+}
+
+/// # `POST /_matrix/client/v3/account/3pid/delete`
+pub(crate) async fn delete_3pid_route(
+	State(services): State<crate::State>,
+	body: Ruma<delete_3pid::v3::Request>,
+) -> Result<delete_3pid::v3::Response> {
+	let sender_user = body.sender_user();
+
+	if body.medium != Medium::Email {
+		return Ok(delete_3pid::v3::Response {
+			id_server_unbind_result: ThirdPartyIdRemovalStatus::NoSupport,
+		});
+	}
+
+	if services
+		.threepid
+		.disassociate_localpart_email(sender_user.localpart())
+		.await
+		.is_none()
+	{
+		return Err!(Request(ThreepidNotFound("Your account has no associated email.")));
+	}
+
+	Ok(delete_3pid::v3::Response {
+		id_server_unbind_result: ThirdPartyIdRemovalStatus::Success,
+	})
+}
--- a/src/api/client/capabilities.rs
+++ b/src/api/client/capabilities.rs
@@ -30,8 +30,10 @@ pub(crate) async fn get_capabilities_route(
 		default: services.server.config.default_room_version.clone(),
 	};

-	// we do not implement 3PID stuff
-	capabilities.thirdparty_id_changes = ThirdPartyIdChangesCapability { enabled: false };
+	// Only allow 3pid changes if SMTP is configured
+	capabilities.thirdparty_id_changes = ThirdPartyIdChangesCapability {
+		enabled: services.mailer.mailer().is_some(),
+	};

 	capabilities.get_login_token = GetLoginTokenCapability {
 		enabled: services.server.config.login_via_existing_session,
@@ -51,7 +53,7 @@ pub(crate) async fn get_capabilities_route(
 		.await
 	{
 		// Advertise suspension API
-		capabilities.set("uk.timedout.msc4323", json!({"suspend":true, "lock": false}))?;
+		capabilities.set("uk.timedout.msc4323", json!({"suspend": true, "lock": false}))?;
 	}

 	Ok(get_capabilities::v3::Response { capabilities })
--- a/src/api/client/device.rs
+++ b/src/api/client/device.rs
@@ -1,17 +1,15 @@
 use axum::extract::State;
 use axum_client_ip::InsecureClientIp;
-use conduwuit::{Err, Error, Result, debug, err, utils};
+use conduwuit::{Err, Result, debug, err, utils};
 use futures::StreamExt;
 use ruma::{
 	MilliSecondsSinceUnixEpoch, OwnedDeviceId,
-	api::client::{
-		device::{self, delete_device, delete_devices, get_device, get_devices, update_device},
-		error::ErrorKind,
-		uiaa::{AuthFlow, AuthType, UiaaInfo},
+	api::client::device::{
+		self, delete_device, delete_devices, get_device, get_devices, update_device,
 	},
 };
+use service::uiaa::Identity;

-use super::SESSION_ID_LENGTH;
 use crate::{Ruma, client::DEVICE_ID_LENGTH};

 /// # `GET /_matrix/client/r0/devices`
@@ -123,7 +121,7 @@ pub(crate) async fn delete_device_route(
 	State(services): State<crate::State>,
 	body: Ruma<delete_device::v3::Request>,
 ) -> Result<delete_device::v3::Response> {
-	let (sender_user, sender_device) = body.sender();
+	let sender_user = body.sender_user();
 	let appservice = body.appservice_info.as_ref();

 	if appservice.is_some_and(|appservice| appservice.registration.device_management) {
@@ -139,41 +137,11 @@ pub(crate) async fn delete_device_route(
 		return Ok(delete_device::v3::Response {});
 	}

-	// UIAA
-	let mut uiaainfo = UiaaInfo {
-		flows: vec![AuthFlow { stages: vec![AuthType::Password] }],
-		completed: Vec::new(),
-		params: Box::default(),
-		session: None,
-		auth_error: None,
-	};
-
-	match &body.auth {
-		| Some(auth) => {
-			let (worked, uiaainfo) = services
-				.uiaa
-				.try_auth(sender_user, sender_device, auth, &uiaainfo)
-				.await?;
-
-			if !worked {
-				return Err!(Uiaa(uiaainfo));
-			}
-			// Success!
-		},
-		| _ => match body.json_body {
-			| Some(ref json) => {
-				uiaainfo.session = Some(utils::random_string(SESSION_ID_LENGTH));
-				services
-					.uiaa
-					.create(sender_user, sender_device, &uiaainfo, json);
-
-				return Err!(Uiaa(uiaainfo));
-			},
-			| _ => {
-				return Err!(Request(NotJson("Not json.")));
-			},
-		},
-	}
+	// Prompt the user to confirm with their password using UIAA
+	let _ = services
+		.uiaa
+		.authenticate_password(&body.auth, Some(Identity::from_user_id(sender_user)))
+		.await?;

 	services
 		.users
@@ -200,7 +168,7 @@ pub(crate) async fn delete_devices_route(
 	State(services): State<crate::State>,
 	body: Ruma<delete_devices::v3::Request>,
 ) -> Result<delete_devices::v3::Response> {
-	let (sender_user, sender_device) = body.sender();
+	let sender_user = body.sender_user();
 	let appservice = body.appservice_info.as_ref();

 	if appservice.is_some_and(|appservice| appservice.registration.device_management) {
@@ -215,41 +183,11 @@ pub(crate) async fn delete_devices_route(
 		return Ok(delete_devices::v3::Response {});
 	}

-	// UIAA
-	let mut uiaainfo = UiaaInfo {
-		flows: vec![AuthFlow { stages: vec![AuthType::Password] }],
-		completed: Vec::new(),
-		params: Box::default(),
-		session: None,
-		auth_error: None,
-	};
-
-	match &body.auth {
-		| Some(auth) => {
-			let (worked, uiaainfo) = services
-				.uiaa
-				.try_auth(sender_user, sender_device, auth, &uiaainfo)
-				.await?;
-
-			if !worked {
-				return Err(Error::Uiaa(uiaainfo));
-			}
-			// Success!
-		},
-		| _ => match body.json_body {
-			| Some(ref json) => {
-				uiaainfo.session = Some(utils::random_string(SESSION_ID_LENGTH));
-				services
-					.uiaa
-					.create(sender_user, sender_device, &uiaainfo, json);
-
-				return Err(Error::Uiaa(uiaainfo));
-			},
-			| _ => {
-				return Err(Error::BadRequest(ErrorKind::NotJson, "Not json."));
-			},
-		},
-	}
+	// Prompt the user to confirm with their password using UIAA
+	let _ = services
+		.uiaa
+		.authenticate_password(&body.auth, Some(Identity::from_user_id(sender_user)))
+		.await?;

 	for device_id in &body.devices {
 		services.users.remove_device(sender_user, device_id).await;
--- a/src/api/client/keys.rs
+++ b/src/api/client/keys.rs
@@ -7,7 +7,6 @@
 use conduwuit::{
 	Err, Error, Result, debug, debug_warn, err,
 	result::NotFound,
-	utils,
 	utils::{IterStream, stream::WidebandExt},
 };
 use conduwuit_service::{Services, users::parse_master_key};
@@ -22,7 +21,6 @@
 				upload_signatures::{self},
 				upload_signing_keys,
 			},
-			uiaa::{AuthFlow, AuthType, UiaaInfo},
 		},
 		federation,
 	},
@@ -30,8 +28,8 @@
 	serde::Raw,
 };
 use serde_json::json;
+use service::uiaa::Identity;

-use super::SESSION_ID_LENGTH;
 use crate::Ruma;

 /// # `POST /_matrix/client/r0/keys/upload`
@@ -174,16 +172,7 @@ pub(crate) async fn upload_signing_keys_route(
 	State(services): State<crate::State>,
 	body: Ruma<upload_signing_keys::v3::Request>,
 ) -> Result<upload_signing_keys::v3::Response> {
-	let (sender_user, sender_device) = body.sender();
-
-	// UIAA
-	let mut uiaainfo = UiaaInfo {
-		flows: vec![AuthFlow { stages: vec![AuthType::Password] }],
-		completed: Vec::new(),
-		params: Box::default(),
-		session: None,
-		auth_error: None,
-	};
+	let sender_user = body.sender_user();

 	match check_for_new_keys(
 		services,
@@ -207,32 +196,10 @@ pub(crate) async fn upload_signing_keys_route(
 			// Some of the keys weren't found, so we let them upload
 		},
 		| _ => {
-			match &body.auth {
-				| Some(auth) => {
-					let (worked, uiaainfo) = services
-						.uiaa
-						.try_auth(sender_user, sender_device, auth, &uiaainfo)
-						.await?;
-
-					if !worked {
-						return Err(Error::Uiaa(uiaainfo));
-					}
-					// Success!
-				},
-				| _ => match body.json_body.as_ref() {
-					| Some(json) => {
-						uiaainfo.session = Some(utils::random_string(SESSION_ID_LENGTH));
-						services
-							.uiaa
-							.create(sender_user, sender_device, &uiaainfo, json);
-
-						return Err(Error::Uiaa(uiaainfo));
-					},
-					| _ => {
-						return Err(Error::BadRequest(ErrorKind::NotJson, "Not json."));
-					},
-				},
-			}
+			let _ = services
+				.uiaa
+				.authenticate_password(&body.auth, Some(Identity::from_user_id(sender_user)))
+				.await?;
 		},
 	}

--- a/src/api/client/mod.rs
+++ b/src/api/client/mod.rs
@@ -92,6 +92,3 @@

 /// generated user access token length
 const TOKEN_LENGTH: usize = 32;
-
-/// generated user session ID length
-const SESSION_ID_LENGTH: usize = service::uiaa::SESSION_ID_LENGTH;
--- a/src/api/client/session.rs
+++ b/src/api/client/session.rs
@@ -8,8 +8,9 @@
 	warn,
 };
 use conduwuit_core::{debug_error, debug_warn};
-use conduwuit_service::{Services, uiaa::SESSION_ID_LENGTH};
+use conduwuit_service::Services;
 use futures::StreamExt;
+use lettre::Address;
 use ruma::{
 	OwnedUserId, UserId,
 	api::client::{
@@ -26,9 +27,10 @@
 			},
 			logout, logout_all,
 		},
-		uiaa,
+		uiaa::UserIdentifier,
 	},
 };
+use service::uiaa::Identity;

 use super::{DEVICE_ID_LENGTH, TOKEN_LENGTH};
 use crate::Ruma;
@@ -80,7 +82,7 @@ pub(crate) async fn password_login(
 			.password_hash(lowercased_user_id)
 			.await
 			.map(|hash| (hash, lowercased_user_id))
-			.map_err(|_| err!(Request(Forbidden("Wrong username or password."))))?,
+			.map_err(|_| err!(Request(Forbidden("Invalid identifier or password."))))?,
 	};

 	if hash.is_empty() {
@@ -89,7 +91,7 @@ pub(crate) async fn password_login(

 	hash::verify_password(password, &hash)
 		.inspect_err(|e| debug_error!("{e}"))
-		.map_err(|_| err!(Request(Forbidden("Wrong username or password."))))?;
+		.map_err(|_| err!(Request(Forbidden("Invalid identifier or password."))))?;

 	Ok(user_id.to_owned())
 }
@@ -161,28 +163,38 @@ pub(super) async fn ldap_login(

 pub(crate) async fn handle_login(
 	services: &Services,
-	body: &Ruma<login::v3::Request>,
-	identifier: Option<&uiaa::UserIdentifier>,
+	identifier: Option<&UserIdentifier>,
 	password: &str,
 	user: Option<&String>,
 ) -> Result<OwnedUserId> {
 	debug!("Got password login type");
+	let user_id_or_localpart = match (identifier, user) {
+		| (Some(UserIdentifier::UserIdOrLocalpart(localpart)), _) => localpart,
+		| (Some(UserIdentifier::Email { address }), _) => {
+			let email = Address::try_from(address.to_owned())
+				.map_err(|_| err!(Request(InvalidParam("Email is malformed"))))?;
+
+			&services
+				.threepid
+				.get_localpart_for_email(&email)
+				.await
+				.ok_or_else(|| err!(Request(Forbidden("Invalid identifier or password"))))?
+		},
+		| (None, Some(user)) => user,
+		| _ => {
+			return Err!(Request(InvalidParam("Identifier type not recognized")));
+		},
+	};
+
 	let user_id =
-				if let Some(uiaa::UserIdentifier::UserIdOrLocalpart(user_id)) = identifier {
-					UserId::parse_with_server_name(user_id, &services.config.server_name)
-				} else if let Some(user) = user {
-					UserId::parse_with_server_name(user, &services.config.server_name)
-				} else {
-					return Err!(Request(Unknown(
-						debug_warn!(?body.login_info, "Valid identifier or username was not provided (invalid or unsupported login type?)")
-					)));
-				}
-				.map_err(|e| err!(Request(InvalidUsername(warn!("Username is invalid: {e}")))))?;
+		UserId::parse_with_server_name(user_id_or_localpart, &services.config.server_name)
+			.map_err(|_| err!(Request(InvalidUsername("User ID is malformed"))))?;

 	let lowercased_user_id = UserId::parse_with_server_name(
 		user_id.localpart().to_lowercase(),
 		&services.config.server_name,
-	)?;
+	)
+	.unwrap();

 	if !services.globals.user_is_local(&user_id)
 		|| !services.globals.user_is_local(&lowercased_user_id)
@@ -244,7 +256,7 @@ pub(crate) async fn login_route(
 			password,
 			user,
 			..
-		}) => handle_login(&services, &body, identifier.as_ref(), password, user.as_ref()).await?,
+		}) => handle_login(&services, identifier.as_ref(), password, user.as_ref()).await?,
 		| login::v3::LoginInfo::Token(login::v3::Token { token }) => {
 			debug!("Got token login type");
 			if !services.server.config.login_via_existing_session {
@@ -264,7 +276,7 @@ pub(crate) async fn login_route(
 			};

 			let user_id =
-				if let Some(uiaa::UserIdentifier::UserIdOrLocalpart(user_id)) = identifier {
+				if let Some(UserIdentifier::UserIdOrLocalpart(user_id)) = identifier {
 					UserId::parse_with_server_name(user_id, &services.config.server_name)
 				} else if let Some(user) = user {
 					UserId::parse_with_server_name(user, &services.config.server_name)
@@ -273,7 +285,7 @@ pub(crate) async fn login_route(
 						debug_warn!(?body.login_info, "Valid identifier or username was not provided (invalid or unsupported login type?)")
 					)));
 				}
-				.map_err(|e| err!(Request(InvalidUsername(warn!("Username is invalid: {e}")))))?;
+				.map_err(|_| err!(Request(InvalidUsername(warn!("User ID is malformed")))))?;

 			if !services.globals.user_is_local(&user_id) {
 				return Err!(Request(Unknown("User ID does not belong to this homeserver")));
@@ -370,45 +382,13 @@ pub(crate) async fn login_token_route(
 		return Err!(Request(Forbidden("Login via an existing session is not enabled")));
 	}

-	// This route SHOULD have UIA
-	// TODO: How do we make only UIA sessions that have not been used before valid?
-	let (sender_user, sender_device) = body.sender();
+	let sender_user = body.sender_user();

-	let mut uiaainfo = uiaa::UiaaInfo {
-		flows: vec![uiaa::AuthFlow { stages: vec![uiaa::AuthType::Password] }],
-		completed: Vec::new(),
-		params: Box::default(),
-		session: None,
-		auth_error: None,
-	};
-
-	match &body.auth {
-		| Some(auth) => {
-			let (worked, uiaainfo) = services
-				.uiaa
-				.try_auth(sender_user, sender_device, auth, &uiaainfo)
-				.await?;
-
-			if !worked {
-				return Err(Error::Uiaa(uiaainfo));
-			}
-
-			// Success!
-		},
-		| _ => match body.json_body.as_ref() {
-			| Some(json) => {
-				uiaainfo.session = Some(utils::random_string(SESSION_ID_LENGTH));
-				services
-					.uiaa
-					.create(sender_user, sender_device, &uiaainfo, json);
-
-				return Err(Error::Uiaa(uiaainfo));
-			},
-			| _ => {
-				return Err!(Request(NotJson("No JSON body was sent when required.")));
-			},
-		},
-	}
+	// Prompt the user to confirm with their password using UIAA
+	let _ = services
+		.uiaa
+		.authenticate_password(&body.auth, Some(Identity::from_user_id(sender_user)))
+		.await?;

 	let login_token = utils::random_string(TOKEN_LENGTH);
 	let expires_in = services.users.create_login_token(sender_user, &login_token);
--- a/src/api/router.rs
+++ b/src/api/router.rs
@@ -28,7 +28,8 @@ pub fn build(router: Router<State>, server: &Server) -> Router<State> {
        .ruma_route(&client::appservice_ping)
 		.ruma_route(&client::get_supported_versions_route)
 		.ruma_route(&client::get_register_available_route)
-		.ruma_route(&client::register_route)
+		.ruma_route(&client::register::register_route)
+		.ruma_route(&client::register::request_registration_token_via_email_route)
 		.ruma_route(&client::get_login_types_route)
 		.ruma_route(&client::login_route)
 		.ruma_route(&client::login_token_route)
@@ -36,10 +37,13 @@ pub fn build(router: Router<State>, server: &Server) -> Router<State> {
 		.ruma_route(&client::logout_route)
 		.ruma_route(&client::logout_all_route)
 		.ruma_route(&client::change_password_route)
+		.ruma_route(&client::request_password_change_token_via_email_route)
 		.ruma_route(&client::deactivate_route)
-		.ruma_route(&client::third_party_route)
-		.ruma_route(&client::request_3pid_management_token_via_email_route)
-		.ruma_route(&client::request_3pid_management_token_via_msisdn_route)
+		.ruma_route(&client::threepid::third_party_route)
+		.ruma_route(&client::threepid::request_3pid_management_token_via_email_route)
+		.ruma_route(&client::threepid::request_3pid_management_token_via_msisdn_route)
+		.ruma_route(&client::threepid::add_3pid_route)
+		.ruma_route(&client::threepid::delete_3pid_route)
 		.ruma_route(&client::check_registration_token_validity)
 		.ruma_route(&client::get_capabilities_route)
 		.ruma_route(&client::get_pushrules_all_route)
--- a/src/api/router/args.rs
+++ b/src/api/router/args.rs
@@ -2,14 +2,13 @@

 use axum::{body::Body, extract::FromRequest};
 use bytes::{BufMut, Bytes, BytesMut};
-use conduwuit::{Error, Result, debug, debug_warn, err, trace, utils::string::EMPTY};
+use conduwuit::{Error, Result, debug, debug_warn, err, trace};
 use ruma::{
 	CanonicalJsonObject, CanonicalJsonValue, DeviceId, OwnedDeviceId, OwnedServerName,
 	OwnedUserId, ServerName, UserId, api::IncomingRequest,
 };
-use service::Services;

-use super::{auth, auth::Auth, request, request::Request};
+use super::{auth, request, request::Request};
 use crate::{State, service::appservice::RegistrationInfo};

 /// Extractor for Ruma request structs
@@ -108,7 +107,7 @@ async fn from_request(
 		}
 		let auth = auth::auth(services, &mut request, json_body.as_ref(), &T::METADATA).await?;
 		Ok(Self {
-			body: make_body::<T>(services, &mut request, json_body.as_mut(), &auth)?,
+			body: make_body::<T>(&mut request, json_body.as_mut())?,
 			origin: auth.origin,
 			sender_user: auth.sender_user,
 			sender_device: auth.sender_device,
@@ -118,16 +117,11 @@ async fn from_request(
 	}
 }

-fn make_body<T>(
-	services: &Services,
-	request: &mut Request,
-	json_body: Option<&mut CanonicalJsonValue>,
-	auth: &Auth,
-) -> Result<T>
+fn make_body<T>(request: &mut Request, json_body: Option<&mut CanonicalJsonValue>) -> Result<T>
 where
 	T: IncomingRequest,
 {
-	let body = take_body(services, request, json_body, auth);
+	let body = take_body(request, json_body);
 	let http_request = into_http_request(request, body);
 	T::try_from_http_request(http_request, &request.path)
 		.map_err(|e| err!(Request(BadJson(debug_warn!("{e}")))))
@@ -151,38 +145,11 @@ fn into_http_request(request: &Request, body: Bytes) -> hyper::Request<Bytes> {
 }

 #[allow(clippy::needless_pass_by_value)]
-fn take_body(
-	services: &Services,
-	request: &mut Request,
-	json_body: Option<&mut CanonicalJsonValue>,
-	auth: &Auth,
-) -> Bytes {
+fn take_body(request: &mut Request, json_body: Option<&mut CanonicalJsonValue>) -> Bytes {
 	let Some(CanonicalJsonValue::Object(json_body)) = json_body else {
 		return mem::take(&mut request.body);
 	};

-	let user_id = auth.sender_user.clone().unwrap_or_else(|| {
-		let server_name = services.globals.server_name();
-		UserId::parse_with_server_name(EMPTY, server_name).expect("valid user_id")
-	});
-
-	let uiaa_request = json_body
-		.get("auth")
-		.and_then(CanonicalJsonValue::as_object)
-		.and_then(|auth| auth.get("session"))
-		.and_then(CanonicalJsonValue::as_str)
-		.and_then(|session| {
-			services
-				.uiaa
-				.get_uiaa_request(&user_id, auth.sender_device.as_deref(), session)
-		});
-
-	if let Some(CanonicalJsonValue::Object(initial_request)) = uiaa_request {
-		for (key, value) in initial_request {
-			json_body.entry(key).or_insert(value);
-		}
-	}
-
 	let mut buf = BytesMut::new().writer();
 	serde_json::to_writer(&mut buf, &json_body).expect("value serialization can't fail");
 	buf.into_inner().freeze()
--- a/src/core/Cargo.toml
+++ b/src/core/Cargo.toml
@@ -84,6 +84,7 @@ libc.workspace = true
 libloading.workspace = true
 libloading.optional = true
 log.workspace = true
+lettre.workspace = true
 num-traits.workspace = true
 rand.workspace = true
 rand_core = { version = "0.6.4", features = ["getrandom"] }
--- a/src/core/config/mod.rs
+++ b/src/core/config/mod.rs
@@ -16,6 +16,7 @@
 };
 use figment::providers::{Env, Format, Toml};
 pub use figment::{Figment, value::Value as FigmentValue};
+use lettre::message::Mailbox;
 use regex::RegexSet;
 use ruma::{
 	OwnedRoomId, OwnedRoomOrAliasId, OwnedServerName, OwnedUserId, RoomVersionId,
@@ -760,6 +761,9 @@ pub struct Config {
 	#[serde(default)]
 	pub well_known: WellKnownConfig,

+	/// display: nested
+	pub smtp: Option<SmtpConfig>,
+
 	/// Enable OpenTelemetry OTLP tracing export. This replaces the deprecated
 	/// Jaeger exporter. Traces will be sent via OTLP to a collector (such as
 	/// Jaeger) that supports the OpenTelemetry Protocol.
@@ -2444,6 +2448,52 @@ pub struct DraupnirConfig {
 	pub secret: String,
 }

+#[derive(Clone, Debug, Deserialize)]
+#[config_example_generator(
+	filename = "conduwuit-example.toml",
+	section = "global.smtp",
+	optional = "true"
+)]
+pub struct SmtpConfig {
+	/// A `smtp://`` URI which will be used to connect to a mail server.
+	/// Uncommenting the [global.smtp] group and setting this option enables
+	/// features which depend on the ability to send email,
+	/// such as self-service password resets.
+	///
+	/// For most modern mail servers, format the URI like this:
+	/// 	`smtps://username:password@hostname:port`
+	/// Note that you will need to URL-encode the username and password. If your
+	/// username _is_ your email address, you will need to replace the `@` with
+	/// `%40`.
+	///
+	/// For a guide on the accepted URI syntax, consult Lettre's documentation:
+	/// https://docs.rs/lettre/latest/lettre/transport/smtp/struct.AsyncSmtpTransport.html#method.from_url
+	pub connection_uri: String,
+
+	/// The outgoing address which will be used for sending emails.
+	///
+	/// For a syntax guide, see https://datatracker.ietf.org/doc/html/rfc2822#section-3.4
+	///
+	/// ...or if you don't want to read the RFC, for some reason:
+	/// - `Name <address@domain.org>` to specify a sender name
+	/// - `address@domain.org` to not use a name
+	pub sender: Mailbox,
+
+	/// Whether to require that users provide an email address when they
+	/// register.
+	///
+	/// default: false
+	#[serde(default)]
+	pub require_email_for_registration: bool,
+
+	/// Whether to require that users who register with a registration token
+	/// provide an email address.
+	///
+	/// default: false
+	#[serde(default)]
+	pub require_email_for_token_registration: bool,
+}
+
 const DEPRECATED_KEYS: &[&str] = &[
 	"cache_capacity",
 	"conduit_cache_capacity_modifier",
--- a/src/database/de.rs
+++ b/src/database/de.rs
@@ -415,13 +415,6 @@ fn deserialize_ignored_any<V: Visitor<'de>>(self, _visitor: V) -> Result<V::Valu
 		tracing::instrument(level = "trace", skip_all, fields(?self.buf))
 	)]
 	fn deserialize_any<V: Visitor<'de>>(self, visitor: V) -> Result<V::Value> {
-		debug_assert_eq!(
-			conduwuit::debug::type_name::<V>(),
-			"serde_json::value::de::<impl serde_core::de::Deserialize for \
-			 serde_json::value::Value>::deserialize::ValueVisitor",
-			"deserialize_any: type not expected"
-		);
-
 		match self.record_peek_byte() {
 			| Some(b'{') => self.deserialize_map(visitor),
 			| Some(b'[') => serde_json::Deserializer::from_slice(self.record_next())
--- a/src/database/maps.rs
+++ b/src/database/maps.rs
@@ -53,6 +53,10 @@ pub(super) fn open_list(db: &Arc<Engine>, maps: &[Descriptor]) -> Result<Maps> {
 		name: "disabledroomids",
 		..descriptor::RANDOM_SMALL
 	},
+	Descriptor {
+		name: "email_localpart",
+		..descriptor::RANDOM_SMALL
+	},
 	Descriptor {
 		name: "eventid_outlierpdu",
 		cache_disp: CacheDisp::SharedWith("pduid_pdu"),
@@ -100,6 +104,10 @@ pub(super) fn open_list(db: &Arc<Engine>, maps: &[Descriptor]) -> Result<Maps> {
 		name: "lazyloadedids",
 		..descriptor::RANDOM_SMALL
 	},
+	Descriptor {
+		name: "localpart_email",
+		..descriptor::RANDOM_SMALL
+	},
 	Descriptor {
 		name: "mediaid_file",
 		..descriptor::RANDOM_SMALL
--- a/src/service/Cargo.toml
+++ b/src/service/Cargo.toml
@@ -91,6 +91,7 @@ conduwuit-database.workspace = true
 const-str.workspace = true
 either.workspace = true
 futures.workspace = true
+governor.workspace = true
 hickory-resolver.workspace = true
 http.workspace = true
 image.workspace = true
@@ -102,6 +103,7 @@ ldap3.optional = true
 log.workspace = true
 loole.workspace = true
 lru-cache.workspace = true
+nonzero_ext.workspace = true
 rand.workspace = true
 regex.workspace = true
 reqwest.workspace = true
@@ -123,6 +125,7 @@ blurhash.workspace = true
 blurhash.optional = true
 recaptcha-verify = { version = "0.2.0", default-features = false }
 yansi.workspace = true
+lettre.workspace = true

 [target.'cfg(all(unix, target_os = "linux"))'.dependencies]
 sd-notify.workspace = true
--- a/src/service/firstrun/mod.rs
+++ b/src/service/firstrun/mod.rs
@@ -122,7 +122,7 @@ fn disable_first_run(&self) -> bool {
 	/// if they were not.
 	pub async fn empower_first_user(&self, user: &UserId) -> Result<bool> {
 		#[derive(Template)]
-		#[template(path = "welcome.md.j2")]
+		#[template(path = "welcome.md")]
 		struct WelcomeMessage<'a> {
 			config: &'a Dep<config::Service>,
 			domain: &'a str,
@@ -228,19 +228,34 @@ pub fn print_first_run_banner(&self) {
 				);
 			},
 		}
+
+		if self.services.config.suspend_on_register {
+			eprintln!(
+				"{} Accounts created after yours will be suspended, as set in your \
+				 configuration.",
+				"Your account will not be suspended when you register.".green()
+			);
+		}
+
+		if let Some(smtp) = &self.services.config.smtp {
+			if smtp.require_email_for_registration || smtp.require_email_for_token_registration {
+				eprintln!(
+					"{} Accounts created after yours may be required to provide an email \
+					 address, as set in your configuration.",
+					"You will not be asked for your email address when you register.".yellow(),
+				);
+			}
+			eprintln!(
+				"If you wish to associate an email address with your account, you may do so \
+				 after registration in your client's settings (if supported)."
+			);
+		}
+
 		eprintln!(
 			"{} https://matrix.org/ecosystem/clients/",
 			"Find a list of Matrix clients here:".bold()
 		);

-		if self.services.config.suspend_on_register {
-			eprintln!(
-				"{} Because you enabled suspend-on-register in your configuration, accounts \
-				 created after yours will be automatically suspended.",
-				"Your account will not be suspended when you register.".green()
-			);
-		}
-
 		if self
 			.services
 			.config
--- a/src/service/mailer/messages.rs
+++ b/src/service/mailer/messages.rs
@@ -0,0 +1,49 @@
+use askama::Template;
+use ruma::UserId;
+
+pub trait MessageTemplate: Template {
+	fn subject(&self) -> String;
+}
+
+#[derive(Template)]
+#[template(path = "mail/change_email.txt")]
+pub struct ChangeEmail<'a> {
+	pub server_name: &'a str,
+	pub user_id: Option<&'a UserId>,
+	pub verification_link: String,
+}
+
+impl MessageTemplate for ChangeEmail<'_> {
+	fn subject(&self) -> String { "Verify your email address".to_owned() }
+}
+
+#[derive(Template)]
+#[template(path = "mail/new_account.txt")]
+pub struct NewAccount<'a> {
+	pub server_name: &'a str,
+	pub verification_link: String,
+}
+
+impl MessageTemplate for NewAccount<'_> {
+	fn subject(&self) -> String { "Create your new Matrix account".to_owned() }
+}
+
+#[derive(Template)]
+#[template(path = "mail/password_reset.txt")]
+pub struct PasswordReset<'a> {
+	pub display_name: Option<&'a str>,
+	pub user_id: &'a UserId,
+	pub verification_link: String,
+}
+
+impl MessageTemplate for PasswordReset<'_> {
+	fn subject(&self) -> String { format!("Password reset request for {}", &self.user_id) }
+}
+
+#[derive(Template)]
+#[template(path = "mail/test.txt")]
+pub struct Test;
+
+impl MessageTemplate for Test {
+	fn subject(&self) -> String { "Test message".to_owned() }
+}
--- a/src/service/mailer/mod.rs
+++ b/src/service/mailer/mod.rs
@@ -0,0 +1,109 @@
+use std::sync::Arc;
+
+use conduwuit::{Err, Result, err, info};
+use lettre::{
+	AsyncSmtpTransport, AsyncTransport, Tokio1Executor,
+	message::{Mailbox, MessageBuilder, header::ContentType},
+};
+
+use crate::{Args, mailer::messages::MessageTemplate};
+
+pub mod messages;
+
+type Transport = AsyncSmtpTransport<Tokio1Executor>;
+type TransportError = lettre::transport::smtp::Error;
+
+pub struct Service {
+	transport: Option<(Mailbox, Transport)>,
+}
+
+#[async_trait::async_trait]
+impl crate::Service for Service {
+	fn build(args: Args<'_>) -> Result<Arc<Self>> {
+		let transport = args
+			.server
+			.config
+			.smtp
+			.as_ref()
+			.map(|config| {
+				Ok((config.sender.clone(), Transport::from_url(&config.connection_uri)?.build()))
+			})
+			.transpose()
+			.map_err(|err: TransportError| err!("Failed to set up SMTP transport: {err}"))?;
+
+		Ok(Arc::new(Self { transport }))
+	}
+
+	fn name(&self) -> &str { crate::service::make_name(std::module_path!()) }
+
+	async fn worker(self: Arc<Self>) -> Result<()> {
+		if let Some((_, ref transport)) = self.transport {
+			match transport.test_connection().await {
+				| Ok(true) => {
+					info!("SMTP connection test successful");
+					Ok(())
+				},
+				| Ok(false) => {
+					Err!("SMTP connection test failed")
+				},
+				| Err(err) => {
+					Err!("SMTP connection test failed: {err}")
+				},
+			}
+		} else {
+			info!("SMTP is not configured, email functionality will be unavailable");
+			Ok(())
+		}
+	}
+}
+
+impl Service {
+	/// Returns a mailer which allows email to be sent, if SMTP is configured.
+	#[must_use]
+	pub fn mailer(&self) -> Option<Mailer<'_>> {
+		self.transport
+			.as_ref()
+			.map(|(sender, transport)| Mailer { sender, transport })
+	}
+
+	pub fn expect_mailer(&self) -> Result<Mailer<'_>> {
+		self.mailer().ok_or_else(|| {
+			err!(Request(FeatureDisabled("This homeserver is not configured to send email.")))
+		})
+	}
+}
+
+pub struct Mailer<'a> {
+	sender: &'a Mailbox,
+	transport: &'a Transport,
+}
+
+impl Mailer<'_> {
+	/// Sends an email.
+	pub async fn send<Template: MessageTemplate>(
+		&self,
+		recipient: Mailbox,
+		message: Template,
+	) -> Result<()> {
+		let subject = message.subject();
+		let body = message
+			.render()
+			.map_err(|err| err!("Failed to render message template: {err}"))?;
+
+		let message = MessageBuilder::new()
+			.from(self.sender.clone())
+			.to(recipient)
+			.subject(subject)
+			.date_now()
+			.header(ContentType::TEXT_PLAIN)
+			.body(body)
+			.expect("should have been able to construct message");
+
+		self.transport
+			.send(message)
+			.await
+			.map_err(|err: TransportError| err!("Failed to send message: {err}"))?;
+
+		Ok(())
+	}
+}
--- a/src/service/mod.rs
+++ b/src/service/mod.rs
@@ -21,6 +21,7 @@
 pub mod firstrun;
 pub mod globals;
 pub mod key_backups;
+pub mod mailer;
 pub mod media;
 pub mod moderation;
 pub mod password_reset;
@@ -32,6 +33,7 @@
 pub mod sending;
 pub mod server_keys;
 pub mod sync;
+pub mod threepid;
 pub mod transactions;
 pub mod uiaa;
 pub mod users;
--- a/src/service/registration_tokens/mod.rs
+++ b/src/service/registration_tokens/mod.rs
@@ -13,8 +13,6 @@

 use crate::{Dep, config, firstrun};

-const RANDOM_TOKEN_LENGTH: usize = 16;
-
 pub struct Service {
 	db: Data,
 	services: Services,
@@ -103,9 +101,11 @@ fn name(&self) -> &str { crate::service::make_name(std::module_path!()) }
 }

 impl Service {
+	const RANDOM_TOKEN_LENGTH: usize = 16;
+
 	/// Generate a random string suitable to be used as a registration token.
 	#[must_use]
-	pub fn generate_token_string() -> String { utils::random_string(RANDOM_TOKEN_LENGTH) }
+	pub fn generate_token_string() -> String { utils::random_string(Self::RANDOM_TOKEN_LENGTH) }

 	/// Issue a new registration token and save it in the database.
 	pub fn issue_token(
--- a/src/service/services.rs
+++ b/src/service/services.rs
@@ -9,12 +9,12 @@

 use crate::{
 	account_data, admin, announcements, antispam, appservice, client, config, emergency,
-	federation, firstrun, globals, key_backups,
+	federation, firstrun, globals, key_backups, mailer,
 	manager::Manager,
 	media, moderation, password_reset, presence, pusher, registration_tokens, resolver, rooms,
 	sending, server_keys,
 	service::{self, Args, Map, Service},
-	sync, transactions, uiaa, users,
+	sync, threepid, transactions, uiaa, users,
 };

 pub struct Services {
@@ -28,6 +28,7 @@ pub struct Services {
 	pub key_backups: Arc<key_backups::Service>,
 	pub media: Arc<media::Service>,
 	pub password_reset: Arc<password_reset::Service>,
+	pub mailer: Arc<mailer::Service>,
 	pub presence: Arc<presence::Service>,
 	pub pusher: Arc<pusher::Service>,
 	pub registration_tokens: Arc<registration_tokens::Service>,
@@ -39,6 +40,7 @@ pub struct Services {
 	pub server_keys: Arc<server_keys::Service>,
 	pub sync: Arc<sync::Service>,
 	pub transactions: Arc<transactions::Service>,
+	pub threepid: Arc<threepid::Service>,
 	pub uiaa: Arc<uiaa::Service>,
 	pub users: Arc<users::Service>,
 	pub moderation: Arc<moderation::Service>,
@@ -83,6 +85,7 @@ macro_rules! build {
 			key_backups: build!(key_backups::Service),
 			media: build!(media::Service),
 			password_reset: build!(password_reset::Service),
+			mailer: build!(mailer::Service),
 			presence: build!(presence::Service),
 			pusher: build!(pusher::Service),
 			registration_tokens: build!(registration_tokens::Service),
@@ -112,6 +115,7 @@ macro_rules! build {
 			sending: build!(sending::Service),
 			server_keys: build!(server_keys::Service),
 			sync: build!(sync::Service),
+			threepid: build!(threepid::Service),
 			transactions: build!(transactions::Service),
 			uiaa: build!(uiaa::Service),
 			users: build!(users::Service),
--- a/src/service/templates/mail/_base.txt
+++ b/src/service/templates/mail/_base.txt
@@ -0,0 +1,3 @@
+{%- block content %}{% endblock %}
+
+Message sent by Continuwuity {{ env!("CARGO_PKG_VERSION") }}. 🐈
--- a/src/service/templates/mail/change_email.txt
+++ b/src/service/templates/mail/change_email.txt
@@ -0,0 +1,13 @@
+{% extends "_base.txt" %}
+
+{% block content -%}
+Hello!
+{% if let Some(user_id) = user_id -%}
+Somebody, probably you, tried to associate this email address with the Matrix account {{ user_id }}.
+{%- else -%}
+Somebody, probably you, tried to associate this email address with a Matrix account on {{ server_name }}.
+{%- endif %}
+If that was you, and this is your email address, click this link to proceed:
+    {{ verification_link }}
+Otherwise, you can ignore this email. The above link will expire in one hour.
+{%- endblock %}
--- a/src/service/templates/mail/new_account.txt
+++ b/src/service/templates/mail/new_account.txt
@@ -0,0 +1,10 @@
+{% extends "_base.txt" %}
+
+{% block content -%}
+Hello!
+
+Somebody, probably you, tried to create a Matrix account on {{ server_name }} using this email address.
+Use the link below to proceed with creating your account:
+    {{ verification_link }}
+If you are not trying to create an account, you can ignore this email. The above link will expire in one hour.
+{%- endblock %}
--- a/src/service/templates/mail/password_reset.txt
+++ b/src/service/templates/mail/password_reset.txt
@@ -0,0 +1,14 @@
+{% extends "_base.txt" %}
+
+{% block content -%}
+{%- if let Some(display_name) = display_name -%}
+Hello {{ display_name }} ({{ user_id }}),
+{%- else -%}
+Hello {{ user_id }},
+{%- endif %}
+
+Somebody, probably you, tried to reset your Matrix account's password.
+If you requested for your password to be reset, click this link to proceed:
+    {{ verification_link }}
+Otherwise, you can ignore this email. The above link will expire in one hour.
+{%- endblock %}
--- a/src/service/templates/mail/test.txt
+++ b/src/service/templates/mail/test.txt
@@ -0,0 +1,5 @@
+{% extends "_base.txt" %}
+
+{% block content -%}
+If you're seeing this, SMTP is configured correctly. :3
+{%- endblock %}
--- a/src/service/templates/welcome.md.j2
+++ b/src/service/templates/welcome.md.j2
--- a/src/service/threepid/mod.rs
+++ b/src/service/threepid/mod.rs
@@ -0,0 +1,281 @@
+use std::{borrow::Cow, collections::HashMap, sync::Arc};
+
+use conduwuit::{Err, Error, Result, result::FlatOk};
+use database::{Deserialized, Map};
+use governor::{DefaultKeyedRateLimiter, Quota, RateLimiter};
+use lettre::{Address, message::Mailbox};
+use nonzero_ext::nonzero;
+use ruma::{
+	ClientSecret, OwnedClientSecret, OwnedSessionId, SessionId, api::client::error::ErrorKind,
+};
+
+mod session;
+
+use crate::{
+	Args, Dep, config,
+	mailer::{self, messages::MessageTemplate},
+	threepid::session::{ValidationSessions, ValidationState, ValidationToken},
+};
+
+pub struct Service {
+	db: Data,
+	services: Services,
+	sessions: tokio::sync::Mutex<ValidationSessions>,
+	send_attempts: std::sync::Mutex<HashMap<(OwnedClientSecret, Address), usize>>,
+	ratelimiter: DefaultKeyedRateLimiter<Address>,
+}
+
+struct Data {
+	localpart_email: Arc<Map>,
+	email_localpart: Arc<Map>,
+}
+
+struct Services {
+	config: Dep<config::Service>,
+	mailer: Dep<mailer::Service>,
+}
+
+impl crate::Service for Service {
+	fn build(args: Args<'_>) -> Result<Arc<Self>> {
+		Ok(Arc::new(Self {
+			db: Data {
+				email_localpart: args.db["email_localpart"].clone(),
+				localpart_email: args.db["localpart_email"].clone(),
+			},
+			services: Services {
+				config: args.depend("config"),
+				mailer: args.depend("mailer"),
+			},
+			sessions: tokio::sync::Mutex::default(),
+			send_attempts: std::sync::Mutex::default(),
+			ratelimiter: RateLimiter::keyed(Self::EMAIL_RATELIMIT),
+		}))
+	}
+
+	fn name(&self) -> &str { crate::service::make_name(std::module_path!()) }
+}
+
+impl Service {
+	// Each address gets two tickets to send an email, which refill at a rate of one
+	// per ten minutes. This allows two emails to be sent at once without waiting
+	// (in case the first one gets eaten), but requires a wait of at least ten
+	// minutes before sending another.
+	const EMAIL_RATELIMIT: Quota =
+		Quota::per_minute(nonzero!(10_u32)).allow_burst(nonzero!(2_u32));
+	const VALIDATION_URL_PATH: &str = "/_continuwuity/3pid/email/validate";
+
+	/// Send a validation message to an email address.
+	///
+	/// Returns the validation session ID on success.
+	#[allow(clippy::impl_trait_in_params)]
+	pub async fn send_validation_email<Template: MessageTemplate>(
+		&self,
+		recipient: Mailbox,
+		prepare_body: impl FnOnce(String) -> Template,
+		client_secret: &ClientSecret,
+		send_attempt: usize,
+	) -> Result<OwnedSessionId> {
+		let mailer = self.services.mailer.expect_mailer()?;
+		let mut sessions = self.sessions.lock().await;
+
+		let session = match sessions.get_session_by_client_secret(client_secret) {
+			// If a validation session already exists for this client secret, we can either
+			// reuse it with a new token or return early because it's already valid.
+			| Some(session) => {
+				match session.validation_state {
+					| ValidationState::Validated => {
+						// If the existing session is already valid, don't send an email.
+						return Ok(session.session_id.clone());
+					},
+					| ValidationState::Pending(ref mut token) => {
+						// Check ratelimiting for the target address.
+						if self.ratelimiter.check_key(&recipient.email).is_err() {
+							return Err(Error::BadRequest(
+								ErrorKind::LimitExceeded { retry_after: None },
+								"You're sending emails too fast, try again in a few minutes.",
+							));
+						}
+
+						// Check the send attempt for this session.
+						let mut send_attempts = self.send_attempts.lock().unwrap();
+
+						let last_send_attempt = send_attempts
+							.entry((session.client_secret.clone(), session.email.clone()))
+							.or_default();
+
+						if send_attempt <= *last_send_attempt {
+							// If the supplied send attempt isn't higher than the last
+							// one, don't send an email.
+							return Ok(session.session_id.clone());
+						}
+
+						// Save this send attempt.
+						*last_send_attempt = send_attempt;
+						drop(send_attempts);
+
+						// Create a new token for the existing session.
+						*token = ValidationToken::new_random();
+
+						session
+					},
+				}
+			},
+			// If no session exists, create a new one.
+			| None => sessions.create_session(recipient.email.clone(), client_secret.to_owned()),
+		};
+
+		// Clone this so it can outlive the lock we're holding on `sessions`
+		let session_id = session.session_id.clone();
+
+		let ValidationState::Pending(token) = &session.validation_state else {
+			unreachable!("session should be pending")
+		};
+
+		let mut validation_url = self
+			.services
+			.config
+			.get_client_domain()
+			.join(Self::VALIDATION_URL_PATH)
+			.unwrap();
+
+		validation_url
+			.query_pairs_mut()
+			.append_pair("session", session_id.as_str())
+			.append_pair("token", &token.token);
+
+		// Once the validation URL is built, we don't need any data borrowed from
+		// `sessions` anymore and can release our lock
+		drop(sessions);
+
+		let message = prepare_body(validation_url.to_string());
+
+		mailer.send(recipient, message).await?;
+
+		Ok(session_id)
+	}
+
+	/// Attempt to mark a validation session as valid using a validation token.
+	pub async fn try_validate_session(
+		&self,
+		session_id: &SessionId,
+		supplied_token: &str,
+	) -> Result<(), Cow<'static, str>> {
+		let mut sessions = self.sessions.lock().await;
+
+		let Some(session) = sessions.get_session(session_id) else {
+			return Err("Validation session does not exist".into());
+		};
+
+		session.validation_state = match &session.validation_state {
+			| ValidationState::Validated => {
+				// If the session is already validated, do nothing.
+
+				return Ok(());
+			},
+			| ValidationState::Pending(token) => {
+				// Otherwise check the token and mark the session as valid.
+
+				if *token != *supplied_token || !token.is_valid() {
+					return Err("Validation token is invalid or expired, please request a new \
+					            one"
+					.into());
+				}
+
+				ValidationState::Validated
+			},
+		};
+
+		Ok(())
+	}
+
+	/// Consume a validated validation session, removing it from the database
+	/// and returning the newly validated email address.
+	pub async fn consume_valid_session(
+		&self,
+		session_id: &SessionId,
+		client_secret: &ClientSecret,
+	) -> Result<Address, Cow<'static, str>> {
+		let mut sessions = self.sessions.lock().await;
+
+		let Some(session) = sessions.get_session(session_id) else {
+			return Err("Validation session does not exist".into());
+		};
+
+		if session.client_secret == client_secret
+			&& matches!(session.validation_state, ValidationState::Validated)
+		{
+			let session = sessions.remove_session(session_id);
+
+			Ok(session.email)
+		} else {
+			Err("This email address has not been validated. Did you use the link that was sent \
+			     to you?"
+				.into())
+		}
+	}
+
+	/// Associate a localpart with an email address.
+	pub async fn associate_localpart_email(
+		&self,
+		localpart: &str,
+		email: &Address,
+	) -> Result<()> {
+		match self.get_localpart_for_email(email).await {
+			| Some(existing_localpart) if existing_localpart != localpart => {
+				// Another account is already using the supplied email.
+
+				Err!(Request(ThreepidInUse("This email address is already in use.")))
+			},
+			| Some(_) => {
+				// The supplied localpart is already associated with the supplied email,
+				// no changes are necessary.
+				Ok(())
+			},
+			| None => {
+				// The supplied email is not already in use.
+
+				let email: &str = email.as_ref();
+				self.db.localpart_email.insert(localpart, email);
+				self.db.email_localpart.insert(email, localpart);
+				Ok(())
+			},
+		}
+	}
+
+	/// Given a localpart, remove its corresponding email address.
+	///
+	/// [`Self::get_localpart_for_email`] may be used if only the email is
+	/// known.
+	pub async fn disassociate_localpart_email(&self, localpart: &str) -> Option<Address> {
+		let email = self.get_email_for_localpart(localpart).await?;
+
+		self.db.localpart_email.remove(localpart);
+		self.db
+			.email_localpart
+			.remove(<Address as AsRef<str>>::as_ref(&email));
+
+		Some(email)
+	}
+
+	/// Get the email associated with a localpart, if one exists.
+	pub async fn get_email_for_localpart(&self, localpart: &str) -> Option<Address> {
+		self.db
+			.localpart_email
+			.get(localpart)
+			.await
+			.deserialized::<String>()
+			.ok()
+			.map(TryInto::try_into)
+			.flat_ok()
+	}
+
+	/// Get the localpart associated with an email, if one exists.
+	pub async fn get_localpart_for_email(&self, email: &Address) -> Option<String> {
+		self.db
+			.email_localpart
+			.get(<Address as AsRef<str>>::as_ref(email))
+			.await
+			.deserialized()
+			.ok()
+	}
+}
--- a/src/service/threepid/session.rs
+++ b/src/service/threepid/session.rs
@@ -0,0 +1,128 @@
+use std::{
+	collections::HashMap,
+	time::{Duration, SystemTime},
+};
+
+use conduwuit::utils;
+use lettre::Address;
+use ruma::{ClientSecret, OwnedClientSecret, OwnedSessionId, SessionId};
+
+#[derive(Default)]
+pub(super) struct ValidationSessions {
+	sessions: HashMap<OwnedSessionId, ValidationSession>,
+	client_secrets: HashMap<OwnedClientSecret, OwnedSessionId>,
+}
+
+/// A pending or completed email validation session.
+#[derive(Debug)]
+pub(crate) struct ValidationSession {
+	/// The session's ID
+	pub session_id: OwnedSessionId,
+	/// The client's supplied client secret
+	pub client_secret: OwnedClientSecret,
+	/// The email address which is being validated
+	pub email: Address,
+	/// The session's validation state
+	pub validation_state: ValidationState,
+}
+
+/// The state of an email validation session.
+#[derive(Debug)]
+pub(crate) enum ValidationState {
+	/// The session is waiting for this validation token to be provided
+	Pending(ValidationToken),
+	/// The session has been validated
+	Validated,
+}
+
+#[derive(Clone, Debug)]
+pub(crate) struct ValidationToken {
+	pub token: String,
+	pub issued_at: SystemTime,
+}
+
+impl ValidationToken {
+	// one hour
+	const MAX_TOKEN_AGE: Duration = Duration::from_secs(60 * 60);
+	const RANDOM_TOKEN_LENGTH: usize = 16;
+
+	pub(super) fn new_random() -> Self {
+		Self {
+			token: utils::random_string(Self::RANDOM_TOKEN_LENGTH),
+			issued_at: SystemTime::now(),
+		}
+	}
+
+	pub(crate) fn is_valid(&self) -> bool {
+		let now = SystemTime::now();
+
+		now.duration_since(self.issued_at)
+			.is_ok_and(|duration| duration < Self::MAX_TOKEN_AGE)
+	}
+}
+
+impl PartialEq<str> for ValidationToken {
+	fn eq(&self, other: &str) -> bool { self.token == other }
+}
+
+impl ValidationSessions {
+	const RANDOM_SID_LENGTH: usize = 16;
+
+	#[must_use]
+	pub(super) fn generate_session_id() -> OwnedSessionId {
+		OwnedSessionId::parse(utils::random_string(Self::RANDOM_SID_LENGTH)).unwrap()
+	}
+
+	pub(super) fn create_session(
+		&mut self,
+		email: Address,
+		client_secret: OwnedClientSecret,
+	) -> &mut ValidationSession {
+		let session = ValidationSession {
+			session_id: Self::generate_session_id(),
+			client_secret,
+			email,
+			validation_state: ValidationState::Pending(ValidationToken::new_random()),
+		};
+
+		self.client_secrets
+			.insert(session.client_secret.clone(), session.session_id.clone());
+		self.sessions
+			.entry(session.session_id.clone())
+			.insert_entry(session)
+			.into_mut()
+	}
+
+	pub(super) fn get_session(
+		&mut self,
+		session_id: &SessionId,
+	) -> Option<&mut ValidationSession> {
+		self.sessions.get_mut(session_id)
+	}
+
+	pub(super) fn get_session_by_client_secret(
+		&mut self,
+		client_secret: &ClientSecret,
+	) -> Option<&mut ValidationSession> {
+		let session_id = self.client_secrets.get(client_secret)?;
+		let session = self
+			.sessions
+			.get_mut(session_id)
+			.expect("session should exist with session id");
+
+		Some(session)
+	}
+
+	pub(super) fn remove_session(&mut self, session_id: &SessionId) -> ValidationSession {
+		let session = self
+			.sessions
+			.remove(session_id)
+			.expect("session ID should exist");
+
+		self.client_secrets
+			.remove(&session.client_secret)
+			.expect("session should have an associated client secret");
+
+		session
+	}
+}
--- a/src/service/uiaa/mod.rs
+++ b/src/service/uiaa/mod.rs
@@ -1,24 +1,29 @@
-use std::{collections::BTreeMap, sync::Arc};
-
-use conduwuit::{
-	Err, Error, Result, SyncRwLock, err, error, implement, utils,
-	utils::{hash, string::EMPTY},
+use std::{
+	borrow::Cow,
+	collections::{HashMap, HashSet, hash_map::Entry},
+	sync::Arc,
 };
-use database::{Deserialized, Json, Map};
+
+use conduwuit::{Err, Error, Result, error, utils, utils::hash};
+use lettre::Address;
 use ruma::{
-	CanonicalJsonValue, DeviceId, OwnedDeviceId, OwnedUserId, UserId,
+	UserId,
 	api::client::{
 		error::{ErrorKind, StandardErrorBody},
-		uiaa::{AuthData, AuthType, Password, UiaaInfo, UserIdentifier},
+		uiaa::{
+			AuthData, AuthFlow, AuthType, EmailIdentity, Password, ReCaptcha, RegistrationToken,
+			ThirdpartyIdCredentials, UiaaInfo, UserIdentifier,
+		},
 	},
 };
+use serde_json::value::RawValue;
+use tokio::sync::Mutex;

-use crate::{Dep, config, globals, registration_tokens, users};
+use crate::{Dep, config, globals, registration_tokens, threepid, users};

 pub struct Service {
-	userdevicesessionid_uiaarequest: SyncRwLock<RequestMap>,
-	db: Data,
 	services: Services,
+	uiaa_sessions: Mutex<HashMap<String, UiaaSession>>,
 }

 struct Services {
@@ -26,205 +31,191 @@ struct Services {
 	users: Dep<users::Service>,
 	config: Dep<config::Service>,
 	registration_tokens: Dep<registration_tokens::Service>,
+	threepid: Dep<threepid::Service>,
 }

-struct Data {
-	userdevicesessionid_uiaainfo: Arc<Map>,
-}
-
-type RequestMap = BTreeMap<RequestKey, CanonicalJsonValue>;
-type RequestKey = (OwnedUserId, OwnedDeviceId, String);
-
-pub const SESSION_ID_LENGTH: usize = 32;
-
 impl crate::Service for Service {
 	fn build(args: crate::Args<'_>) -> Result<Arc<Self>> {
 		Ok(Arc::new(Self {
-			userdevicesessionid_uiaarequest: SyncRwLock::new(RequestMap::new()),
-			db: Data {
-				userdevicesessionid_uiaainfo: args.db["userdevicesessionid_uiaainfo"].clone(),
-			},
 			services: Services {
 				globals: args.depend::<globals::Service>("globals"),
 				users: args.depend::<users::Service>("users"),
 				config: args.depend::<config::Service>("config"),
 				registration_tokens: args
 					.depend::<registration_tokens::Service>("registration_tokens"),
+				threepid: args.depend::<threepid::Service>("threepid"),
 			},
+			uiaa_sessions: Mutex::new(HashMap::new()),
 		}))
 	}

 	fn name(&self) -> &str { crate::service::make_name(std::module_path!()) }
 }

-/// Creates a new Uiaa session. Make sure the session token is unique.
-#[implement(Service)]
-pub fn create(
-	&self,
-	user_id: &UserId,
-	device_id: &DeviceId,
-	uiaainfo: &UiaaInfo,
-	json_body: &CanonicalJsonValue,
-) {
-	// TODO: better session error handling (why is uiaainfo.session optional in
-	// ruma?)
-	self.set_uiaa_request(
-		user_id,
-		device_id,
-		uiaainfo.session.as_ref().expect("session should be set"),
-		json_body,
-	);
-
-	self.update_uiaa_session(
-		user_id,
-		device_id,
-		uiaainfo.session.as_ref().expect("session should be set"),
-		Some(uiaainfo),
-	);
+struct UiaaSession {
+	info: UiaaInfo,
+	identity: Identity,
 }

-#[implement(Service)]
-#[allow(clippy::useless_let_if_seq)]
-pub async fn try_auth(
-	&self,
-	user_id: &UserId,
-	device_id: &DeviceId,
-	auth: &AuthData,
-	uiaainfo: &UiaaInfo,
-) -> Result<(bool, UiaaInfo)> {
-	let mut uiaainfo = if let Some(session) = auth.session() {
-		self.get_uiaa_session(user_id, device_id, session).await?
-	} else {
-		uiaainfo.clone()
-	};
+/// Information about the authenticated user's identity.
+///
+/// A field of this struct will only be Some if the user completed
+/// a stage which provided that information. If multiple stages provide
+/// the same field, authentication will fail if they do not all provide
+/// _identical_ values for that field.
+#[derive(Default, Clone)]
+pub struct Identity {
+	/// The authenticated user's user ID, if it could be determined.
+	///
+	/// This will be Some if:
+	/// - The user completed a m.login.password stage
+	/// - The user completed a m.login.email.identity stage, and their email has
+	///   an associated user ID
+	pub localpart: Option<String>,

-	if uiaainfo.session.is_none() {
-		uiaainfo.session = Some(utils::random_string(SESSION_ID_LENGTH));
+	/// The authenticated user's email address, if it could be determined.
+	///
+	/// This will be Some if:
+	/// - The user completed a m.login.email.identity stage
+	/// - The user completed a m.login.password stage, and their user ID has an
+	///   associated email
+	pub email: Option<Address>,
+}
+
+macro_rules! identity_update_fn {
+	(fn $method:ident($field:ident : $type:ty)else $error:literal) => {
+		fn $method(&mut self, $field: $type) -> Result<(), StandardErrorBody> {
+			if self.$field.is_none() {
+				self.$field = Some($field);
+				Ok(())
+			} else if self.$field == Some($field) {
+				Ok(())
+			} else {
+				Err(StandardErrorBody {
+					kind: ErrorKind::InvalidParam,
+					message: $error.to_owned(),
+				})
+			}
+		}
+	};
+}
+
+impl Identity {
+	identity_update_fn!(fn try_set_localpart(localpart: String) else "User ID mismatch");
+
+	identity_update_fn!(fn try_set_email(email: Address) else "Email mismatch");
+
+	/// Create an Identity with the localpart of the provided user ID
+	/// and all other fields set to None.
+	#[must_use]
+	pub fn from_user_id(user_id: &UserId) -> Self {
+		Self {
+			localpart: Some(user_id.localpart().to_owned()),
+			..Default::default()
+		}
+	}
+}
+
+impl Service {
+	const SESSION_ID_LENGTH: usize = 32;
+
+	/// Perform the full UIAA authentication sequence for a route given its
+	/// authentication data.
+	pub async fn authenticate(
+		&self,
+		auth: &Option<AuthData>,
+		flows: Vec<AuthFlow>,
+		params: Box<RawValue>,
+		identity: Option<Identity>,
+	) -> Result<Identity> {
+		match auth.as_ref() {
+			| None => {
+				let info = self.create_session(flows, params, identity).await;
+
+				Err(Error::Uiaa(info))
+			},
+			| Some(auth) => {
+				let session: Cow<'_, str> = match auth.session() {
+					| Some(session) => session.into(),
+					| None => {
+						// Clients are allowed to send UIAA requests with an auth dict and no
+						// session if they want to start the UIAA exchange with existing
+						// authentication data. If that happens, we create a new session
+						// here.
+						self.create_session(flows, params, identity)
+							.await
+							.session
+							.unwrap()
+							.into()
+					},
+				};
+
+				match self.continue_session(auth, &session).await? {
+					| Ok(identity) => Ok(identity),
+					| Err(info) => Err(Error::Uiaa(info)),
+				}
+			},
+		}
 	}

-	match auth {
-		// Find out what the user completed
-		| AuthData::Password(Password {
-			identifier,
-			password,
-			#[cfg(feature = "element_hacks")]
-			user,
-			..
-		}) => {
-			#[cfg(feature = "element_hacks")]
-			let username = if let Some(UserIdentifier::UserIdOrLocalpart(username)) = identifier {
-				username
-			} else if let Some(username) = user {
-				username
-			} else {
-				return Err(Error::BadRequest(
-					ErrorKind::Unrecognized,
-					"Identifier type not recognized.",
-				));
-			};
+	/// A helper to perform UIAA authentication with just a password stage.
+	#[inline]
+	pub async fn authenticate_password(
+		&self,
+		auth: &Option<AuthData>,
+		identity: Option<Identity>,
+	) -> Result<Identity> {
+		self.authenticate(
+			auth,
+			vec![AuthFlow::new(vec![AuthType::Password])],
+			Box::default(),
+			identity,
+		)
+		.await
+	}

-			#[cfg(not(feature = "element_hacks"))]
-			let Some(UserIdentifier::UserIdOrLocalpart(username)) = identifier else {
-				return Err(Error::BadRequest(
-					ErrorKind::Unrecognized,
-					"Identifier type not recognized.",
-				));
-			};
+	/// Create a new UIAA session with a random session ID.
+	///
+	/// If information about the user's identity is already known, it may be
+	/// supplied with the `identity` parameter. Authentication will fail if
+	/// flows provide different values for known identity information.
+	///
+	/// Returns the info of the newly created session.
+	async fn create_session(
+		&self,
+		flows: Vec<AuthFlow>,
+		params: Box<RawValue>,
+		identity: Option<Identity>,
+	) -> UiaaInfo {
+		let mut uiaa_sessions = self.uiaa_sessions.lock().await;

-			let user_id_from_username = UserId::parse_with_server_name(
-				username.clone(),
-				self.services.globals.server_name(),
-			)
-			.map_err(|_| Error::BadRequest(ErrorKind::InvalidParam, "User ID is invalid."))?;
+		let session_id = utils::random_string(Self::SESSION_ID_LENGTH);
+		let mut info = UiaaInfo::new(flows, params);
+		info.session = Some(session_id.clone());

-			// Check if the access token being used matches the credentials used for UIAA
-			if user_id.localpart() != user_id_from_username.localpart() {
-				return Err!(Request(Forbidden("User ID and access token mismatch.")));
-			}
-			let user_id = user_id_from_username;
+		uiaa_sessions.insert(session_id, UiaaSession {
+			info: info.clone(),
+			identity: identity.unwrap_or_default(),
+		});

-			// Check if password is correct
-			let mut password_verified = false;
+		info
+	}

-			// First try local password hash verification
-			if let Ok(hash) = self.services.users.password_hash(&user_id).await {
-				password_verified = hash::verify_password(password, &hash).is_ok();
-			}
+	/// Proceed with UIAA authentication given a client's authorization data.
+	async fn continue_session(
+		&self,
+		auth: &AuthData,
+		session: &str,
+	) -> Result<Result<Identity, UiaaInfo>> {
+		// Hold this lock for the entire function to make sure that, if try_auth()
+		// is called concurrently with the same session, only one call will succeed
+		let mut uiaa_sessions = self.uiaa_sessions.lock().await;

-			// If local password verification failed, try LDAP authentication
-			#[cfg(feature = "ldap")]
-			if !password_verified && self.services.config.ldap.enable {
-				// Search for user in LDAP to get their DN
-				if let Ok(dns) = self.services.users.search_ldap(&user_id).await {
-					if let Some((user_dn, _is_admin)) = dns.first() {
-						// Try to authenticate with LDAP
-						password_verified = self
-							.services
-							.users
-							.auth_ldap(user_dn, password)
-							.await
-							.is_ok();
-					}
-				}
-			}
+		let Entry::Occupied(mut session) = uiaa_sessions.entry(session.to_owned()) else {
+			return Err!(Request(InvalidParam("Invalid session")));
+		};

-			if !password_verified {
-				uiaainfo.auth_error = Some(StandardErrorBody {
-					kind: ErrorKind::forbidden(),
-					message: "Invalid username or password.".to_owned(),
-				});
-
-				return Ok((false, uiaainfo));
-			}
-
-			// Password was correct! Let's add it to `completed`
-			uiaainfo.completed.push(AuthType::Password);
-		},
-		| AuthData::ReCaptcha(r) => {
-			let Some(ref private_site_key) = self.services.config.recaptcha_private_site_key
-			else {
-				return Err!(Request(Forbidden("ReCaptcha is not configured.")));
-			};
-			match recaptcha_verify::verify_v3(private_site_key, r.response.as_str(), None).await {
-				| Ok(()) => {
-					uiaainfo.completed.push(AuthType::ReCaptcha);
-				},
-				| Err(e) => {
-					error!("ReCaptcha verification failed: {e:?}");
-					uiaainfo.auth_error = Some(StandardErrorBody {
-						kind: ErrorKind::forbidden(),
-						message: "ReCaptcha verification failed.".to_owned(),
-					});
-					return Ok((false, uiaainfo));
-				},
-			}
-		},
-		| AuthData::RegistrationToken(t) => {
-			let token = t.token.trim().to_owned();
-
-			if let Some(valid_token) = self
-				.services
-				.registration_tokens
-				.validate_token(token)
-				.await
-			{
-				self.services
-					.registration_tokens
-					.mark_token_as_used(valid_token);
-
-				uiaainfo.completed.push(AuthType::RegistrationToken);
-			} else {
-				uiaainfo.auth_error = Some(StandardErrorBody {
-					kind: ErrorKind::forbidden(),
-					message: "Invalid registration token.".to_owned(),
-				});
-				return Ok((false, uiaainfo));
-			}
-		},
-		| AuthData::Dummy(_) => {
-			uiaainfo.completed.push(AuthType::Dummy);
-		},
-		| AuthData::FallbackAcknowledgement(_) => {
+		if let &AuthData::FallbackAcknowledgement(_) = auth {
 			// The client is checking if authentication has succeeded out-of-band. This is
 			// possible if the client is using "fallback auth" (see spec section
 			// 4.9.1.4), which we don't support (and probably never will, because it's a
@@ -232,109 +223,243 @@ pub async fn try_auth(

 			// Return early to tell the client that no, authentication did not succeed while
 			// it wasn't looking.
-			return Ok((false, uiaainfo));
-		},
-		| k => error!("type not supported: {:?}", k),
-	}
-
-	// Check if a flow now succeeds
-	let mut completed = false;
-	'flows: for flow in &mut uiaainfo.flows {
-		for stage in &flow.stages {
-			if !uiaainfo.completed.contains(stage) {
-				continue 'flows;
-			}
+			return Ok(Err(session.get().info.clone()));
+		}
+
+		let completed = {
+			let UiaaSession { info, identity } = session.get_mut();
+
+			let auth_type = auth.auth_type().expect("auth type should be set");
+
+			let flow_stages: Vec<HashSet<_>> = info
+				.flows
+				.iter()
+				.map(|flow| {
+					flow.stages
+						.iter()
+						.map(AuthType::as_str)
+						.map(ToOwned::to_owned)
+						.collect()
+				})
+				.collect();
+
+			let mut completed_stages: HashSet<_> = info
+				.completed
+				.iter()
+				.map(AuthType::as_str)
+				.map(ToOwned::to_owned)
+				.collect();
+
+			// Don't allow stages which aren't in any flows
+			if !flow_stages
+				.iter()
+				.any(|stages| stages.contains(auth_type.as_str()))
+			{
+				return Err!(Request(InvalidParam("No flows include the supplied stage")));
+			}
+
+			// If the provided stage hasn't already been completed, check it for completion
+			if !completed_stages.contains(auth_type.as_str()) {
+				match self.check_stage(auth, identity.clone()).await {
+					| Ok((completed_stage, updated_identity)) => {
+						info.auth_error = None;
+						completed_stages.insert(completed_stage.to_string());
+						info.completed.push(completed_stage);
+						*identity = updated_identity;
+					},
+					| Err(error) => {
+						info.auth_error = Some(error);
+					},
+				}
+			}
+
+			// UIAA is completed if all stages in any flow are completed
+			flow_stages
+				.iter()
+				.any(|stages| completed_stages.is_superset(stages))
+		};
+
+		if completed {
+			// This session is complete, remove it and return success
+			let (_, UiaaSession { identity, .. }) = session.remove_entry();
+
+			Ok(Ok(identity))
+		} else {
+			// The client needs to try again, return the updated session
+			Ok(Err(session.get().info.clone()))
 		}
-		// We didn't break, so this flow succeeded!
-		completed = true;
 	}

-	if !completed {
-		self.update_uiaa_session(
-			user_id,
-			device_id,
-			uiaainfo.session.as_ref().expect("session is always set"),
-			Some(&uiaainfo),
-		);
+	/// Check if the provided authentication data is valid.
+	///
+	/// Returns the completed stage's type on success and error information on
+	/// failure.
+	async fn check_stage(
+		&self,
+		auth: &AuthData,
+		mut identity: Identity,
+	) -> Result<(AuthType, Identity), StandardErrorBody> {
+		// Note: This function takes ownership of `identity` because mutations to the
+		// identity must not be applied unless checking the stage succeeds. The
+		// updated identity is returned as part of the Ok value, and
+		// `continue_session` handles saving it to `uiaa_sessions`.
+		//
+		// This also means it's fine to mutate `identity` at any point in this function,
+		// because those mutations won't be saved unless the function returns Ok.

-		return Ok((false, uiaainfo));
-	}
+		match auth {
+			| AuthData::Dummy(_) => Ok(AuthType::Dummy),
+			| AuthData::EmailIdentity(EmailIdentity {
+				thirdparty_id_creds: ThirdpartyIdCredentials { client_secret, sid, .. },
+				..
+			}) => {
+				match self
+					.services
+					.threepid
+					.consume_valid_session(sid, client_secret)
+					.await
+				{
+					| Ok(email) => {
+						if let Some(localpart) =
+							self.services.threepid.get_localpart_for_email(&email).await
+						{
+							identity.try_set_localpart(localpart)?;
+						}

-	// UIAA was successful! Remove this session and return true
-	self.update_uiaa_session(
-		user_id,
-		device_id,
-		uiaainfo.session.as_ref().expect("session is always set"),
-		None,
-	);
+						identity.try_set_email(email)?;

-	Ok((true, uiaainfo))
-}
+						Ok(AuthType::EmailIdentity)
+					},
+					| Err(message) => Err(StandardErrorBody {
+						kind: ErrorKind::ThreepidAuthFailed,
+						message: message.into_owned(),
+					}),
+				}
+			},
+			#[allow(clippy::useless_let_if_seq)]
+			| AuthData::Password(Password { identifier, password, .. }) => {
+				let user_id_or_localpart = match identifier {
+					| Some(UserIdentifier::UserIdOrLocalpart(username)) => username.to_owned(),
+					| Some(UserIdentifier::Email { address }) => {
+						let Ok(email) = Address::try_from(address.to_owned()) else {
+							return Err(StandardErrorBody {
+								kind: ErrorKind::InvalidParam,
+								message: "Email is malformed".to_owned(),
+							});
+						};

-#[implement(Service)]
-fn set_uiaa_request(
-	&self,
-	user_id: &UserId,
-	device_id: &DeviceId,
-	session: &str,
-	request: &CanonicalJsonValue,
-) {
-	let key = (user_id.to_owned(), device_id.to_owned(), session.to_owned());
-	self.userdevicesessionid_uiaarequest
-		.write()
-		.insert(key, request.to_owned());
-}
+						if let Some(localpart) =
+							self.services.threepid.get_localpart_for_email(&email).await
+						{
+							identity.try_set_email(email)?;

-#[implement(Service)]
-pub fn get_uiaa_request(
-	&self,
-	user_id: &UserId,
-	device_id: Option<&DeviceId>,
-	session: &str,
-) -> Option<CanonicalJsonValue> {
-	let key = (
-		user_id.to_owned(),
-		device_id.unwrap_or_else(|| EMPTY.into()).to_owned(),
-		session.to_owned(),
-	);
+							localpart
+						} else {
+							return Err(StandardErrorBody {
+								kind: ErrorKind::forbidden(),
+								message: "Invalid identifier or password".to_owned(),
+							});
+						}
+					},
+					| _ =>
+						return Err(StandardErrorBody {
+							kind: ErrorKind::Unrecognized,
+							message: "Identifier type not recognized".to_owned(),
+						}),
+				};

-	self.userdevicesessionid_uiaarequest
-		.read()
-		.get(&key)
-		.cloned()
-}
+				let Ok(user_id) = UserId::parse_with_server_name(
+					user_id_or_localpart,
+					self.services.globals.server_name(),
+				) else {
+					return Err(StandardErrorBody {
+						kind: ErrorKind::InvalidParam,
+						message: "User ID is malformed".to_owned(),
+					});
+				};

-#[implement(Service)]
-fn update_uiaa_session(
-	&self,
-	user_id: &UserId,
-	device_id: &DeviceId,
-	session: &str,
-	uiaainfo: Option<&UiaaInfo>,
-) {
-	let key = (user_id, device_id, session);
+				// Check if password is correct
+				let mut password_verified = false;

-	if let Some(uiaainfo) = uiaainfo {
-		self.db
-			.userdevicesessionid_uiaainfo
-			.put(key, Json(uiaainfo));
-	} else {
-		self.db.userdevicesessionid_uiaainfo.del(key);
+				// First try local password hash verification
+				if let Ok(hash) = self.services.users.password_hash(&user_id).await {
+					password_verified = hash::verify_password(password, &hash).is_ok();
+				}
+
+				// If local password verification failed, try LDAP authentication
+				#[cfg(feature = "ldap")]
+				if !password_verified && self.services.config.ldap.enable {
+					// Search for user in LDAP to get their DN
+					if let Ok(dns) = self.services.users.search_ldap(&user_id).await {
+						if let Some((user_dn, _is_admin)) = dns.first() {
+							// Try to authenticate with LDAP
+							password_verified = self
+								.services
+								.users
+								.auth_ldap(user_dn, password)
+								.await
+								.is_ok();
+						}
+					}
+				}
+
+				if password_verified {
+					identity.try_set_localpart(user_id.localpart().to_owned())?;
+
+					Ok(AuthType::Password)
+				} else {
+					Err(StandardErrorBody {
+						kind: ErrorKind::forbidden(),
+						message: "Invalid identifier or password".to_owned(),
+					})
+				}
+			},
+			| AuthData::ReCaptcha(ReCaptcha { response, .. }) => {
+				let Some(ref private_site_key) = self.services.config.recaptcha_private_site_key
+				else {
+					return Err(StandardErrorBody {
+						kind: ErrorKind::forbidden(),
+						message: "ReCaptcha is not configured".to_owned(),
+					});
+				};
+
+				match recaptcha_verify::verify_v3(private_site_key, response, None).await {
+					| Ok(()) => Ok(AuthType::ReCaptcha),
+					| Err(e) => {
+						error!("ReCaptcha verification failed: {e:?}");
+						Err(StandardErrorBody {
+							kind: ErrorKind::forbidden(),
+							message: "ReCaptcha verification failed".to_owned(),
+						})
+					},
+				}
+			},
+			| AuthData::RegistrationToken(RegistrationToken { token, .. }) => {
+				let token = token.trim().to_owned();
+
+				if let Some(valid_token) = self
+					.services
+					.registration_tokens
+					.validate_token(token)
+					.await
+				{
+					self.services
+						.registration_tokens
+						.mark_token_as_used(valid_token);
+
+					Ok(AuthType::RegistrationToken)
+				} else {
+					Err(StandardErrorBody {
+						kind: ErrorKind::forbidden(),
+						message: "Invalid registration token".to_owned(),
+					})
+				}
+			},
+			| _ => Err(StandardErrorBody {
+				kind: ErrorKind::Unrecognized,
+				message: "Unsupported stage type".into(),
+			}),
+		}
+		.map(|auth_type| (auth_type, identity))
 	}
 }
-
-#[implement(Service)]
-async fn get_uiaa_session(
-	&self,
-	user_id: &UserId,
-	device_id: &DeviceId,
-	session: &str,
-) -> Result<UiaaInfo> {
-	let key = (user_id, device_id, session);
-	self.db
-		.userdevicesessionid_uiaainfo
-		.qry(&key)
-		.await
-		.deserialized()
-		.map_err(|_| err!(Request(Forbidden("UIAA session does not exist."))))
-}
--- a/src/web/mod.rs
+++ b/src/web/mod.rs
@@ -90,6 +90,7 @@ pub fn build() -> Router<state::State> {
 				.merge(resources::build())
 				.merge(password_reset::build())
 				.merge(debug::build())
+				.merge(threepid::build())
 				.fallback(async || WebError::NotFound),
 		)
 		.layer(CatchPanicLayer::custom(|panic: Box<dyn Any + Send + 'static>| {
--- a/src/web/pages/index.rs
+++ b/src/web/pages/index.rs
@@ -1,17 +1,14 @@
-use askama::Template;
 use axum::{Router, extract::State, response::IntoResponse, routing::get};

 use crate::{WebError, template};

 pub(crate) fn build() -> Router<crate::State> {
 	Router::new()
-		.route("/", get(index_handler))
-		.route("/_continuwuity/", get(index_handler))
+		.route("/", get(index))
+		.route("/_continuwuity/", get(index))
 }

-async fn index_handler(
-	State(services): State<crate::State>,
-) -> Result<impl IntoResponse, WebError> {
+async fn index(State(services): State<crate::State>) -> Result<impl IntoResponse, WebError> {
 	template! {
 		struct Index<'a> use "index.html.j2" {
 			server_name: &'a str,
--- a/src/web/pages/mod.rs
+++ b/src/web/pages/mod.rs
@@ -3,6 +3,7 @@
 pub(super) mod index;
 pub(super) mod password_reset;
 pub(super) mod resources;
+pub(super) mod threepid;

 #[derive(Debug)]
 pub(crate) struct TemplateContext {
@@ -43,6 +44,8 @@ fn new(state: &$crate::State, $($field_name: $field_type,)*) -> Self {
        #[allow(single_use_lifetimes)]
        impl$(<$lifetime>)? axum::response::IntoResponse for $name$(<$lifetime>)? {
            fn into_response(self) -> axum::response::Response {
+                use askama::Template;
+
                match self.render() {
                    Ok(rendered) => axum::response::Html(rendered).into_response(),
                    Err(err) => $crate::WebError::from(err).into_response()
--- a/src/web/pages/password_reset.rs
+++ b/src/web/pages/password_reset.rs
@@ -1,4 +1,3 @@
-use askama::Template;
 use axum::{
 	Router,
 	extract::{
@@ -20,11 +19,6 @@

 const INVALID_TOKEN_ERROR: &str = "Invalid reset token. Your reset link may have expired.";

-#[derive(Deserialize)]
-struct PasswordResetQuery {
-	token: String,
-}
-
 template! {
 	struct PasswordReset<'a> use "password_reset.html.j2" {
 		user_card: UserCard<'a>,
@@ -63,6 +57,11 @@ pub(crate) fn build() -> Router<crate::State> {
 		.route("/account/reset_password", get(get_password_reset).post(post_password_reset))
 }

+#[derive(Deserialize)]
+struct PasswordResetQuery {
+	token: String,
+}
+
 async fn password_reset_form(
 	services: crate::State,
 	query: PasswordResetQuery,
--- a/src/web/pages/templates/threepid_validation.html.j2
+++ b/src/web/pages/templates/threepid_validation.html.j2
@@ -0,0 +1,8 @@
+{% extends "_layout.html.j2" %}
+
+{%- block content -%}
+<div class="panel">
+    <h1>Email verification</h1>
+    <p>Your email address has been verified. Return to your Matrix client to continue.</p>
+</div>
+{%- endblock content -%}
--- a/src/web/pages/threepid.rs
+++ b/src/web/pages/threepid.rs
@@ -0,0 +1,39 @@
+use axum::{
+	Router,
+	extract::{Query, State, rejection::QueryRejection},
+	response::IntoResponse,
+	routing::get,
+};
+use ruma::OwnedSessionId;
+use serde::Deserialize;
+
+use crate::{WebError, template};
+
+template! {
+	struct ThreepidValidation use "threepid_validation.html.j2" {}
+}
+
+pub(crate) fn build() -> Router<crate::State> {
+	Router::new().route("/3pid/email/validate", get(threepid_validation))
+}
+
+#[derive(Deserialize)]
+struct ThreepidValidationQuery {
+	session: OwnedSessionId,
+	token: String,
+}
+
+async fn threepid_validation(
+	State(services): State<crate::State>,
+	query: Result<Query<ThreepidValidationQuery>, QueryRejection>,
+) -> Result<impl IntoResponse, WebError> {
+	let Query(query) = query?;
+
+	services
+		.threepid
+		.try_validate_session(&query.session, &query.token)
+		.await
+		.map_err(|message| WebError::BadRequest(message.into_owned()))?;
+
+	Ok(ThreepidValidation::new(&services))
+}
Author	SHA1	Message	Date
timedout	0cc1e4685c	style: Make main green again	2026-03-31 18:07:44 +01:00
ginger	3d2915093c	Update LICENSE	2026-03-31 02:26:22 +00:00
Ginger	e1c54f4dec	fix: Don't allow UIAA stages to be completed if no flow includes them	2026-03-31 02:20:59 +00:00
ginger	0c9fa3b7e5	feat: Add a notice about email to the first-run banner	2026-03-31 02:20:59 +00:00
Ginger	a95b488e6a	chore: Update admin command docs	2026-03-31 02:20:59 +00:00
Ginger	4f8833e937	fix: Update connection_uri docs	2026-03-31 02:20:59 +00:00
Ginger	f32599e030	feat: Supply more informative error message if email is disabled	2026-03-31 02:20:59 +00:00
Ginger	b6f0b41d3d	feat: Ratelimit sending threepid validation emails	2026-03-31 02:20:59 +00:00
Ginger	d5675b85cf	fix: Release session lock before sending threepid validation email	2026-03-31 02:20:59 +00:00
Ginger	951b5abe19	refactor: Remove UiaaStatus enum	2026-03-31 02:20:59 +00:00
Ginger	a325ad16f1	feat: Fall back to email when registering a user who didn't provide a username	2026-03-31 02:20:59 +00:00
Ginger	f93a1cc506	fix: Don't bail out on email association failures when registering a new user	2026-03-31 02:20:59 +00:00
Ginger	6e8dbcbfab	refactor: Remove workarounds for matrix-appservice-irc	2026-03-31 02:20:59 +00:00
ginger	97458207e5	chore: Update news fragment	2026-03-31 02:20:59 +00:00
Ginger	ab8929e2fa	chore: Fix typo	2026-03-31 02:20:59 +00:00
Ginger	166d7d0f63	fix: Remove associated email on account deactivation	2026-03-31 02:20:59 +00:00
Ginger	20a6f0c6fb	chore: News fragment	2026-03-31 02:20:59 +00:00
Ginger	3885e43b5d	feat: Add support for 3pid management	2026-03-31 02:20:59 +00:00
Ginger	ef7ad6082c	feat: Add support for registering a new account with an email address	2026-03-31 02:20:59 +00:00
Ginger	717d319708	feat: Add support for logging in with an email address	2026-03-31 02:20:59 +00:00
Ginger	0b04757bef	feat: Add support for password resets via email	2026-03-31 02:20:59 +00:00
Ginger	f2b7dd6519	feat: Add a webpage for threepid validation links	2026-03-31 02:20:59 +00:00
Ginger	9d06208a7a	feat: Store threepid validation sessions in memory instead of the database	2026-03-31 02:20:59 +00:00
Ginger	955da3a74f	feat: Add admin commands for managing users' email addresses	2026-03-31 02:20:59 +00:00
Ginger	7e79a544cf	refactor: Split account routes into multiple files	2026-03-31 02:20:59 +00:00
Ginger	f5db4d17d6	feat: Refactor UIAA service, add support for email stage	2026-03-31 02:20:59 +00:00
Ginger	54fd1d313f	feat: Implement threepid service	2026-03-31 02:20:59 +00:00
Ginger	bb7fd9efc1	feat: Implement mailer service for sending emails	2026-03-31 02:20:59 +00:00
Jade Ellis	aa79072411	docs: Revert duplicate link	2026-03-29 19:34:56 +01:00
				`@@ -0,0 +1 @@`
				`Added support for associating email addresses with accounts, requiring email addresses for registration, and resetting passwords via email. Contributed by @ginger`