Merge tag 'v1.53.0rc1' into develop

Synapse 1.53.0rc1 (2022-02-15)
==============================

Features
--------

- Add experimental support for sending to-device messages to application services, as specified by [MSC2409](https://github.com/matrix-org/matrix-doc/pull/2409). ([\#11215](https://github.com/matrix-org/synapse/issues/11215), [\#11966](https://github.com/matrix-org/synapse/issues/11966))
- Remove account data (including client config, push rules and ignored users) upon user deactivation. ([\#11655](https://github.com/matrix-org/synapse/issues/11655))
- Experimental support for [MSC3666](https://github.com/matrix-org/matrix-doc/pull/3666): including bundled aggregations in server side search results. ([\#11837](https://github.com/matrix-org/synapse/issues/11837))
- Enable cache time-based expiry by default. The `expiry_time` config flag has been superseded by `expire_caches` and `cache_entry_ttl`. ([\#11849](https://github.com/matrix-org/synapse/issues/11849))
- Add a callback to allow modules to allow or forbid a 3PID (email address, phone number) from being associated to a local account. ([\#11854](https://github.com/matrix-org/synapse/issues/11854))
- Stabilize support and remove unstable endpoints for [MSC3231](https://github.com/matrix-org/matrix-doc/pull/3231). Clients must switch to the stable identifier and endpoint. See the [upgrade notes](https://matrix-org.github.io/synapse/develop/upgrade#stablisation-of-msc3231) for more information. ([\#11867](https://github.com/matrix-org/synapse/issues/11867))
- Allow modules to retrieve the current instance's server name and worker name. ([\#11868](https://github.com/matrix-org/synapse/issues/11868))
- Use a dedicated configurable rate limiter for 3PID invites. ([\#11892](https://github.com/matrix-org/synapse/issues/11892))
- Support the stable API endpoint for [MSC3283](https://github.com/matrix-org/matrix-doc/pull/3283): new settings in `/capabilities` endpoint. ([\#11933](https://github.com/matrix-org/synapse/issues/11933), [\#11989](https://github.com/matrix-org/synapse/issues/11989))
- Support the `dir` parameter on the `/relations` endpoint, per [MSC3715](https://github.com/matrix-org/matrix-doc/pull/3715). ([\#11941](https://github.com/matrix-org/synapse/issues/11941))
- Experimental implementation of [MSC3706](https://github.com/matrix-org/matrix-doc/pull/3706): extensions to `/send_join` to support reduced response size. ([\#11967](https://github.com/matrix-org/synapse/issues/11967))

Bugfixes
--------

- Fix [MSC2716](https://github.com/matrix-org/matrix-doc/pull/2716) historical messages backfilling in random order on remote homeservers. ([\#11114](https://github.com/matrix-org/synapse/issues/11114))
- Fix a bug introduced in Synapse 1.51.0 where incoming federation transactions containing at least one EDU would be dropped if debug logging was enabled for `synapse.8631_debug`. ([\#11890](https://github.com/matrix-org/synapse/issues/11890))
- Fix a long-standing bug where some unknown endpoints would return HTML error pages instead of JSON `M_UNRECOGNIZED` errors. ([\#11930](https://github.com/matrix-org/synapse/issues/11930))
- Implement an allow list of content types for which we will attempt to preview a URL. This prevents Synapse from making useless longer-lived connections to streaming media servers. ([\#11936](https://github.com/matrix-org/synapse/issues/11936))
- Fix a long-standing bug where pagination tokens from `/sync` and `/messages` could not be provided to the `/relations` API. ([\#11952](https://github.com/matrix-org/synapse/issues/11952))
- Require that modules register their callbacks using keyword arguments. ([\#11975](https://github.com/matrix-org/synapse/issues/11975))
- Fix a long-standing bug where `M_WRONG_ROOM_KEYS_VERSION` errors would not include the specced `current_version` field. ([\#11988](https://github.com/matrix-org/synapse/issues/11988))

Improved Documentation
----------------------

- Fix typo in User Admin API: unpind -> unbind. ([\#11859](https://github.com/matrix-org/synapse/issues/11859))
- Document images returned by the User List Media Admin API can include those generated by URL previews. ([\#11862](https://github.com/matrix-org/synapse/issues/11862))
- Remove outdated MSC1711 FAQ document. ([\#11907](https://github.com/matrix-org/synapse/issues/11907))
- Correct the structured logging configuration example. Contributed by Brad Jones. ([\#11946](https://github.com/matrix-org/synapse/issues/11946))
- Add information on the Synapse release cycle. ([\#11954](https://github.com/matrix-org/synapse/issues/11954))
- Fix broken link in the README to the admin API for password reset. ([\#11955](https://github.com/matrix-org/synapse/issues/11955))

Deprecations and Removals
-------------------------

- Drop support for `webclient` listeners and configuring `web_client_location` to a non-HTTP(S) URL. Deprecated configurations are a configuration error. ([\#11895](https://github.com/matrix-org/synapse/issues/11895))
- Remove deprecated `user_may_create_room_with_invites` spam checker callback. See the [upgrade notes](https://matrix-org.github.io/synapse/latest/upgrade.html#removal-of-user_may_create_room_with_invites) for more information. ([\#11950](https://github.com/matrix-org/synapse/issues/11950))
- No longer build `.deb` packages for Ubuntu 21.04 Hirsute Hippo, which has now EOLed. ([\#11961](https://github.com/matrix-org/synapse/issues/11961))

Internal Changes
----------------

- Enhance user registration test helpers to make them more useful for tests involving application services and devices. ([\#11615](https://github.com/matrix-org/synapse/issues/11615), [\#11616](https://github.com/matrix-org/synapse/issues/11616))
- Improve performance when fetching bundled aggregations for multiple events. ([\#11660](https://github.com/matrix-org/synapse/issues/11660), [\#11752](https://github.com/matrix-org/synapse/issues/11752))
- Fix type errors introduced by new annotations in the Prometheus Client library. ([\#11832](https://github.com/matrix-org/synapse/issues/11832))
- Add missing type hints to replication code. ([\#11856](https://github.com/matrix-org/synapse/issues/11856), [\#11938](https://github.com/matrix-org/synapse/issues/11938))
- Ensure that `opentracing` scopes are activated and closed at the right time. ([\#11869](https://github.com/matrix-org/synapse/issues/11869))
- Improve opentracing for incoming federation requests. ([\#11870](https://github.com/matrix-org/synapse/issues/11870))
- Improve internal docstrings in `synapse.util.caches`. ([\#11876](https://github.com/matrix-org/synapse/issues/11876))
- Do not needlessly clear the `get_users_in_room` and `get_users_in_room_with_profiles` caches when any room state changes. ([\#11878](https://github.com/matrix-org/synapse/issues/11878))
- Convert `ApplicationServiceTestCase` to use `simple_async_mock`. ([\#11880](https://github.com/matrix-org/synapse/issues/11880))
- Remove experimental changes to the default push rules which were introduced in Synapse 1.19.0 but never enabled. ([\#11884](https://github.com/matrix-org/synapse/issues/11884))
- Disable coverage calculation for olddeps build. ([\#11888](https://github.com/matrix-org/synapse/issues/11888))
- Preparation to support sending device list updates to application services. ([\#11905](https://github.com/matrix-org/synapse/issues/11905))
- Add a test that checks users receive their own device list updates down `/sync`. ([\#11909](https://github.com/matrix-org/synapse/issues/11909))
- Run Complement tests sequentially. ([\#11910](https://github.com/matrix-org/synapse/issues/11910))
- Various refactors to the application service notifier code. ([\#11911](https://github.com/matrix-org/synapse/issues/11911), [\#11912](https://github.com/matrix-org/synapse/issues/11912))
- Tests: replace mocked `Authenticator` with the real thing. ([\#11913](https://github.com/matrix-org/synapse/issues/11913))
- Various refactors to the typing notifications code. ([\#11914](https://github.com/matrix-org/synapse/issues/11914))
- Use the proper type for the `Content-Length` header in the `UploadResource`. ([\#11927](https://github.com/matrix-org/synapse/issues/11927))
- Remove an unnecessary ignoring of type hints due to fixes in upstream packages. ([\#11939](https://github.com/matrix-org/synapse/issues/11939))
- Add missing type hints. ([\#11953](https://github.com/matrix-org/synapse/issues/11953))
- Fix an import cycle in `synapse.event_auth`. ([\#11965](https://github.com/matrix-org/synapse/issues/11965))
- Unpin `frozendict` but exclude the known bad version 2.1.2. ([\#11969](https://github.com/matrix-org/synapse/issues/11969))
- Prepare for rename of default Complement branch. ([\#11971](https://github.com/matrix-org/synapse/issues/11971))
- Fetch Synapse's version using a helper from `matrix-common`. ([\#11979](https://github.com/matrix-org/synapse/issues/11979))

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-Document images returned by the User List Media Admin API can include those generated by URL previews.