- Port the Password Auth Providers module interface to the new generic interface. ([\#10548](https://github.com/matrix-org/synapse/issues/10548), [\#11180](https://github.com/matrix-org/synapse/issues/11180))
- Resolve and share `state_groups` for all [MSC2716](https://github.com/matrix-org/matrix-doc/pull/2716) historical events in batch. ([\#10975](https://github.com/matrix-org/synapse/issues/10975))
- Experimental support for the thread relation defined in [MSC3440](https://github.com/matrix-org/matrix-doc/pull/3440). ([\#11088](https://github.com/matrix-org/synapse/issues/11088), [\#11181](https://github.com/matrix-org/synapse/issues/11181))
- Users admin API can now also modify user type in addition to allowing it to be set on user creation. ([\#11174](https://github.com/matrix-org/synapse/issues/11174))
Bugfixes
--------
- Newly-created public rooms are now only assigned an alias if the room's creation has not been blocked by permission settings. Contributed by @AndrewFerr. ([\#10930](https://github.com/matrix-org/synapse/issues/10930))
- Fix a long-standing bug which meant that events received over federation were sometimes incorrectly accepted into the room state. ([\#11001](https://github.com/matrix-org/synapse/issues/11001), [\#11009](https://github.com/matrix-org/synapse/issues/11009), [\#11012](https://github.com/matrix-org/synapse/issues/11012))
- Fix 500 error on `/messages` when the server accumulates more than 5 backwards extremities at a given depth for a room. ([\#11027](https://github.com/matrix-org/synapse/issues/11027))
- Fix a bug where setting a user's external_id via the admin API returns 500 and deletes users existing external mappings if that external ID is already mapped. ([\#11051](https://github.com/matrix-org/synapse/issues/11051))
- Fix a long-standing bug where users excluded from the user directory were added into the directory if they belonged to a room which became public or private. ([\#11075](https://github.com/matrix-org/synapse/issues/11075))
- Fix a long-standing bug when attempting to preview URLs which are in the `windows-1252` character encoding. ([\#11077](https://github.com/matrix-org/synapse/issues/11077), [\#11089](https://github.com/matrix-org/synapse/issues/11089))
- Fix broken export-data admin command and add test script checking the command to CI. ([\#11078](https://github.com/matrix-org/synapse/issues/11078))
- Show an error when timestamp in seconds is provided to the `/purge_media_cache` Admin API. ([\#11101](https://github.com/matrix-org/synapse/issues/11101))
- Fix local users who left all their rooms being removed from the user directory, even if the "search_all_users" config option was enabled. ([\#11103](https://github.com/matrix-org/synapse/issues/11103))
- Fix a bug which caused the module API's `get_user_ip_and_agents` function to always fail on workers. `get_user_ip_and_agents` was introduced in 1.44.0 and did not function correctly on worker processes at the time. ([\#11112](https://github.com/matrix-org/synapse/issues/11112))
- Identity server connection is no longer ignoring `ip_range_whitelist`. ([\#11120](https://github.com/matrix-org/synapse/issues/11120))
- Fix a bug introduced in Synapse v1.45.0 breaking the configuration file parsing script. ([\#11145](https://github.com/matrix-org/synapse/issues/11145))
- Fix a performance regression introduced in v1.44.0 which could cause client requests to time out when making large numbers of outbound requests. ([\#11177](https://github.com/matrix-org/synapse/issues/11177))
Improved Documentation
----------------------
- Fix broken links relating to module API deprecation in the upgrade notes. ([\#11069](https://github.com/matrix-org/synapse/issues/11069))
- Add more information about what happens when a user is deactivated. ([\#11083](https://github.com/matrix-org/synapse/issues/11083))
- Clarify the the sample log config can be copied from the documentation without issue. ([\#11092](https://github.com/matrix-org/synapse/issues/11092))
- Update the admin API documentation with an updated list of the characters allowed in registration tokens. ([\#11093](https://github.com/matrix-org/synapse/issues/11093))
- Document Synapse's behaviour when dealing with multiple modules registering the same callbacks and/or handlers for the same HTTP endpoints. ([\#11096](https://github.com/matrix-org/synapse/issues/11096))
- Fix instances of `[example]{.title-ref}` in the upgrade documentation as a result of prior RST to Markdown conversion. ([\#11118](https://github.com/matrix-org/synapse/issues/11118))
- Document the version of Synapse each module callback was introduced in. ([\#11132](https://github.com/matrix-org/synapse/issues/11132))
- Document the version of Synapse that introduced each module API method. ([\#11183](https://github.com/matrix-org/synapse/issues/11183))
Internal Changes
----------------
- Add type hints to `synapse.storage.databases.main.client_ips`. ([\#10972](https://github.com/matrix-org/synapse/issues/10972))
- Fix spurious warnings about losing the logging context on the `ReplicationCommandHandler` when losing the replication connection. ([\#10984](https://github.com/matrix-org/synapse/issues/10984))
- Include rejected status when we log events. ([\#11008](https://github.com/matrix-org/synapse/issues/11008))
- Add some extra logging to the event persistence code. ([\#11014](https://github.com/matrix-org/synapse/issues/11014))
- Add support for Ubuntu 21.10 "Impish Indri". ([\#11024](https://github.com/matrix-org/synapse/issues/11024))
- Rearrange the internal workings of the incremental user directory updates. ([\#11035](https://github.com/matrix-org/synapse/issues/11035))
- Simplify the user admin API tests. ([\#11048](https://github.com/matrix-org/synapse/issues/11048))
- Mark the Synapse package as containing type annotations and fix export declarations so that Synapse pluggable modules may be type checked against Synapse. ([\#11054](https://github.com/matrix-org/synapse/issues/11054))
- Improve type hints for `_wrap_in_base_path` decorator used by `MediaFilePaths`. ([\#11055](https://github.com/matrix-org/synapse/issues/11055))
- Remove dead code from `MediaFilePaths`. ([\#11056](https://github.com/matrix-org/synapse/issues/11056))
- Add tests for `MediaFilePaths` class. ([\#11057](https://github.com/matrix-org/synapse/issues/11057))
- Be more lenient when parsing oEmbed response versions. ([\#11065](https://github.com/matrix-org/synapse/issues/11065))
- Add type hints to `synapse.events`. ([\#11066](https://github.com/matrix-org/synapse/issues/11066))
- Always dump logs from unit tests during CI runs. ([\#11068](https://github.com/matrix-org/synapse/issues/11068))
- Create a separate module for the retention configuration. ([\#11070](https://github.com/matrix-org/synapse/issues/11070))
- Add a test for the workaround introduced in [\#11042](https://github.com/matrix-org/synapse/pull/11042) concerning the behaviour of third-party rule modules and `SynapseError`s. ([\#11071](https://github.com/matrix-org/synapse/issues/11071))
- Fix type hints in the relations tests. ([\#11076](https://github.com/matrix-org/synapse/issues/11076))
- Add type hints to most `HomeServer` parameters. ([\#11095](https://github.com/matrix-org/synapse/issues/11095))
- Add missing type hints to `synapse.api` module. ([\#11109](https://github.com/matrix-org/synapse/issues/11109))
- Clean up some of the federation event authentication code for clarity. ([\#11115](https://github.com/matrix-org/synapse/issues/11115), [\#11116](https://github.com/matrix-org/synapse/issues/11116), [\#11122](https://github.com/matrix-org/synapse/issues/11122))
- Add type hints for event fetching. ([\#11121](https://github.com/matrix-org/synapse/issues/11121))
- Add docstrings and comments to the application service ephemeral event sending code. ([\#11138](https://github.com/matrix-org/synapse/issues/11138))
- Update the `sign_json` script to support inline configuration of the signing key. ([\#11139](https://github.com/matrix-org/synapse/issues/11139))
- Fix a long-standing bug where users excluded from the directory could still be added to the `users_who_share_private_rooms` table after a regular user joins a private room. ([\#11143](https://github.com/matrix-org/synapse/issues/11143))
- Fix broken link in the docker image README. ([\#11144](https://github.com/matrix-org/synapse/issues/11144))
- Add missing type hints to `synapse.crypto`. ([\#11146](https://github.com/matrix-org/synapse/issues/11146))
Newly-created public rooms are now only assigned an alias if the room's creation has not been blocked by permission settings. Contributed by @AndrewFerr.
Fix a bug where setting a user's external_id via the admin API returns 500 and deletes users existing external mappings if that external ID is already mapped.
Mark the Synapse package as containing type annotations and fix export declarations so that Synapse pluggable modules may be type checked against Synapse.
Add a test for the workaround introduced in [\#11042](https://github.com/matrix-org/synapse/pull/11042) concerning the behaviour of third-party rule modules and `SynapseError`s.
Fix a long-standing bug where users excluded from the user directory were added into the directory if they belonged to a room which became public or private.
Fix a bug which caused the module API's `get_user_ip_and_agents` function to always fail on workers. `get_user_ip_and_agents` was introduced in 1.44.0 and did not function correctly on worker processes at the time.
Fix a long-standing bug where users excluded from the directory could still be added to the `users_who_share_private_rooms` table after a regular user joins a private room.
Sean Quah
3 years ago