Olivier 'reivilibre 964ca65ebb Support MSC4450: Identity Provider selection for User-Interactive Authentication with Legacy Single Sign-On. (#19693) ...

Closes: #19688

Part of: MSC4450 whose Experimental Feature tracking issue is #19691


Add an unstable, namespaced `idp_id` query parameter to `fallback/web` \
This allows clients to specify the identity provider they'd like to log
in with for SSO when they have multiple upstream IdPs associated with
their account.

Previously, Synapse would just pick one arbitrarily. But this was
undesirable as you may want to use a different one at that point in
time. When logging in, the user is able to choose when IdP they use -
during UIA (which uses fallback auth mechanism) they should be able to
do the same.

-----

Signed-off-by: Olivier 'reivilibre <oliverw@matrix.org>
Co-authored-by: Andrew Morgan <andrew@amorgan.xyz>
Co-authored-by: Eric Eastwood <madlittlemods@gmail.com>

2026-04-16 12:19:28 +01:00

..

api

Write union types as X | Y where possible (#19111)

2025-11-06 14:02:33 -06:00

app

Be able to shutdown homeserver that hasn't setup (#19187)

2025-12-02 10:58:06 -06:00

appservice

Write union types as X | Y where possible (#19111)

2025-11-06 14:02:33 -06:00

config

Add a way to expose metrics from the Docker image (SYNAPSE_ENABLE_METRICS) (#19324)

2026-01-01 14:00:00 -06:00

crypto

Allow resigning of events with a new signing key (#19668)

2026-04-14 16:44:58 +00:00

events

Add a FilteredEvent type to handle per-user data on events (#19640)

2026-04-16 09:47:08 +01:00

federation

Add unstable federation API for MSC4370 GET /extremities (#19314)

2026-03-05 18:30:52 +00:00

handlers

Add a FilteredEvent type to handle per-user data on events (#19640)

2026-04-16 09:47:08 +01:00

http

Rename the test_disconnect test helper so that pytest doesn't see it as a test. (#19486)

2026-02-20 15:37:34 +00:00

logging

Port Clock functions to use Duration class (#19229)

2025-12-01 13:55:06 +00:00

media

Allow 'article' and 'profile' opengraph fields on URL previews. (#19659)

2026-04-10 18:04:11 +01:00

metrics

Fix InFlightGauge typing to allow upgrading to prometheus_client 0.24 (#19379)

2026-01-16 20:35:30 +00:00

module_api

Introduce spam_checker_spammy internal event metadata. (#19453)

2026-04-15 16:53:23 +01:00

push

Write union types as X | Y where possible (#19111)

2025-11-06 14:02:33 -06:00

replication

Remove redacted_because from internal unsigned. (#19581)

2026-03-26 09:18:08 +00:00

rest

Support MSC4450: Identity Provider selection for User-Interactive Authentication with Legacy Single Sign-On. (#19693)

2026-04-16 12:19:28 +01:00

scripts

Write union types as X | Y where possible (#19111)

2025-11-06 14:02:33 -06:00

server_notices

Port Clock functions to use Duration class (#19229)

2025-12-01 13:55:06 +00:00

state

Replace usage of deprecated assertEquals with assertEqual (#19345)

2026-01-06 17:30:21 +00:00

storage

Introduce spam_checker_spammy internal event metadata. (#19453)

2026-04-15 16:53:23 +01:00

synapse_rust

Fix KNOWN_ROOM_VERSIONS.__contains__ raising TypeError for non-string keys (#19649)

2026-04-07 12:12:01 +00:00

test_utils

Introduce spam_checker_spammy internal event metadata. (#19453)

2026-04-15 16:53:23 +01:00

types

Replace usage of deprecated assertEquals with assertEqual (#19345)

2026-01-06 17:30:21 +00:00

util

Allow long lived syncs to be cancelled if client has gone away (#19499)

2026-02-26 21:41:06 +00:00

__init__.py

Correctly mention previous copyright (#16820)

2024-01-23 11:26:48 +00:00

server.py

Allow Synapse to start up even when discovery fails for an OpenID Connect provider. (#19509)

2026-03-24 17:39:21 +00:00

test_distributor.py

Cleanly shutdown SynapseHomeServer object (#18828)

2025-10-01 02:42:09 +00:00

test_event_auth.py

Write union types as X | Y where possible (#19111)

2025-11-06 14:02:33 -06:00

test_mau.py

Write union types as X | Y where possible (#19111)

2025-11-06 14:02:33 -06:00

test_phone_home.py

Move unique snowflake homeserver background tasks to start_background_tasks (#19037)

2025-10-13 10:19:09 -05:00

test_rust.py

Add missing type hints to tests. (#15027)

2023-02-08 19:52:37 +00:00

test_server.py

Rename the test_disconnect test helper so that pytest doesn't see it as a test. (#19486)

2026-02-20 15:37:34 +00:00

test_state.py

Write union types as X | Y where possible (#19111)

2025-11-06 14:02:33 -06:00

test_terms_auth.py

Introduce Clock.call_when_running(...) to include logcontext by default (#18944)

2025-09-22 10:27:59 -05:00

test_types.py

Use type hinting generics in standard collections (#19046)

2025-10-22 16:48:19 -05:00

test_visibility.py

Add a FilteredEvent type to handle per-user data on events (#19640)

2026-04-16 09:47:08 +01:00

unittest.py

Demystify and deprecate HomeserverTestCase.pump() (Twisted reactor/clock) (#19602)

2026-03-25 15:33:17 -05:00

utils.py

Implement pagination for MSC2666 (#19279)

2025-12-16 15:24:36 +00:00