Synapse 1.18.0rc1 (2020-07-27)

==============================

Features
--------

- Include room states on invite events that are sent to application services. Contributed by @Sorunome. ([\#6455](https://github.com/matrix-org/synapse/issues/6455))
- Add delete room admin endpoint (`POST /_synapse/admin/v1/rooms/<room_id>/delete`). Contributed by @dklimpel. ([\#7613](https://github.com/matrix-org/synapse/issues/7613), [\#7953](https://github.com/matrix-org/synapse/issues/7953))
- Add experimental support for running multiple federation sender processes. ([\#7798](https://github.com/matrix-org/synapse/issues/7798))
- Add the option to validate the `iss` and `aud` claims for JWT logins. ([\#7827](https://github.com/matrix-org/synapse/issues/7827))
- Add support for handling registration requests across multiple client reader workers. ([\#7830](https://github.com/matrix-org/synapse/issues/7830))
- Add an admin API to list the users in a room. Contributed by Awesome Technologies Innovationslabor GmbH. ([\#7842](https://github.com/matrix-org/synapse/issues/7842))
- Allow email subjects to be customised through Synapse's configuration. ([\#7846](https://github.com/matrix-org/synapse/issues/7846))
- Add the ability to re-activate an account from the admin API. ([\#7847](https://github.com/matrix-org/synapse/issues/7847), [\#7908](https://github.com/matrix-org/synapse/issues/7908))
- Add experimental support for running multiple pusher workers. ([\#7855](https://github.com/matrix-org/synapse/issues/7855))
- Add experimental support for moving typing off master. ([\#7869](https://github.com/matrix-org/synapse/issues/7869), [\#7959](https://github.com/matrix-org/synapse/issues/7959))
- Report CPU metrics to prometheus for time spent processing replication commands. ([\#7879](https://github.com/matrix-org/synapse/issues/7879))
- Support oEmbed for media previews. ([\#7920](https://github.com/matrix-org/synapse/issues/7920))
- Abort federation requests where the client disconnects before the ratelimiter expires. ([\#7930](https://github.com/matrix-org/synapse/issues/7930))
- Cache responses to `/_matrix/federation/v1/state_ids` to reduce duplicated work. ([\#7931](https://github.com/matrix-org/synapse/issues/7931))

Bugfixes
--------

- Fix detection of out of sync remote device lists when receiving events from remote users. ([\#7815](https://github.com/matrix-org/synapse/issues/7815))
- Fix bug where Synapse fails to process an incoming event over federation if the server is missing too much of the event's auth chain. ([\#7817](https://github.com/matrix-org/synapse/issues/7817))
- Fix a bug causing Synapse to misinterpret the value `off` for `encryption_enabled_by_default_for_room_type` in its configuration file(s) if that value isn't surrounded by quotes. This bug was introduced in v1.16.0. ([\#7822](https://github.com/matrix-org/synapse/issues/7822))
- Fix bug where we did not always pass in `app_name` or `server_name` to email templates, including e.g. for registration emails. ([\#7829](https://github.com/matrix-org/synapse/issues/7829))
- Errors which occur while using the non-standard JWT login now return the proper error: `403 Forbidden` with an error code of `M_FORBIDDEN`. ([\#7844](https://github.com/matrix-org/synapse/issues/7844))
- Fix "AttributeError: 'str' object has no attribute 'get'" error message when applying per-room message retention policies. The bug was introduced in Synapse 1.7.0. ([\#7850](https://github.com/matrix-org/synapse/issues/7850))
- Fix a bug introduced in Synapse 1.10.0 which could cause a "no create event in auth events" error during room creation. ([\#7854](https://github.com/matrix-org/synapse/issues/7854))
- Fix a bug which allowed empty rooms to be rejoined over federation. ([\#7859](https://github.com/matrix-org/synapse/issues/7859))
- Fix 'Unable to find a suitable guest user ID' error when using multiple client_reader workers. ([\#7866](https://github.com/matrix-org/synapse/issues/7866))
- Fix a long standing bug where the tracing of async functions with opentracing was broken. ([\#7872](https://github.com/matrix-org/synapse/issues/7872), [\#7961](https://github.com/matrix-org/synapse/issues/7961))
- Fix "TypeError in `synapse.notifier`" exceptions. ([\#7880](https://github.com/matrix-org/synapse/issues/7880))
- Fix deprecation warning due to invalid escape sequences. ([\#7895](https://github.com/matrix-org/synapse/issues/7895))

Updates to the Docker image
---------------------------

- Base docker image on Debian Buster rather than Alpine Linux. Contributed by @maquis196. ([\#7839](https://github.com/matrix-org/synapse/issues/7839))

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

- Provide instructions on using `register_new_matrix_user` via docker. ([\#7885](https://github.com/matrix-org/synapse/issues/7885))
- Change the sample config postgres user section to use `synapse_user` instead of `synapse` to align with the documentation. ([\#7889](https://github.com/matrix-org/synapse/issues/7889))
- Reorder database paragraphs to promote postgres over sqlite. ([\#7933](https://github.com/matrix-org/synapse/issues/7933))
- Update the dates of ACME v1's end of life in [`ACME.md`](https://github.com/matrix-org/synapse/blob/master/docs/ACME.md). ([\#7934](https://github.com/matrix-org/synapse/issues/7934))

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

- Remove unused `synapse_replication_tcp_resource_invalidate_cache` prometheus metric. ([\#7878](https://github.com/matrix-org/synapse/issues/7878))
- Remove Ubuntu Eoan from the list of `.deb` packages that we build as it is now end-of-life. Contributed by @gary-kim. ([\#7888](https://github.com/matrix-org/synapse/issues/7888))

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

- Switch parts of the codebase from `simplejson` to the standard library `json`. ([\#7802](https://github.com/matrix-org/synapse/issues/7802))
- Add type hints to the http server code and remove an unused parameter. ([\#7813](https://github.com/matrix-org/synapse/issues/7813))
- Add type hints to synapse.api.errors module. ([\#7820](https://github.com/matrix-org/synapse/issues/7820))
- Ensure that calls to `json.dumps` are compatible with the standard library json. ([\#7836](https://github.com/matrix-org/synapse/issues/7836))
- Remove redundant `retry_on_integrity_error` wrapper for event persistence code. ([\#7848](https://github.com/matrix-org/synapse/issues/7848))
- Consistently use `db_to_json` to convert from database values to JSON objects. ([\#7849](https://github.com/matrix-org/synapse/issues/7849))
- Convert various parts of the codebase to async/await. ([\#7851](https://github.com/matrix-org/synapse/issues/7851), [\#7860](https://github.com/matrix-org/synapse/issues/7860), [\#7868](https://github.com/matrix-org/synapse/issues/7868), [\#7871](https://github.com/matrix-org/synapse/issues/7871), [\#7873](https://github.com/matrix-org/synapse/issues/7873), [\#7874](https://github.com/matrix-org/synapse/issues/7874), [\#7884](https://github.com/matrix-org/synapse/issues/7884), [\#7912](https://github.com/matrix-org/synapse/issues/7912), [\#7935](https://github.com/matrix-org/synapse/issues/7935), [\#7939](https://github.com/matrix-org/synapse/issues/7939), [\#7942](https://github.com/matrix-org/synapse/issues/7942), [\#7944](https://github.com/matrix-org/synapse/issues/7944))
- Add support for handling registration requests across multiple client reader workers. ([\#7853](https://github.com/matrix-org/synapse/issues/7853))
- Small performance improvement in typing processing. ([\#7856](https://github.com/matrix-org/synapse/issues/7856))
- The default value of `filter_timeline_limit` was changed from -1 (no limit) to 100. ([\#7858](https://github.com/matrix-org/synapse/issues/7858))
- Optimise queueing of inbound replication commands. ([\#7861](https://github.com/matrix-org/synapse/issues/7861))
- Add some type annotations to `HomeServer` and `BaseHandler`. ([\#7870](https://github.com/matrix-org/synapse/issues/7870))
- Clean up `PreserveLoggingContext`. ([\#7877](https://github.com/matrix-org/synapse/issues/7877))
- Change "unknown room version" logging from 'error' to 'warning'. ([\#7881](https://github.com/matrix-org/synapse/issues/7881))
- Stop using `device_max_stream_id` table and just use `device_inbox.stream_id`. ([\#7882](https://github.com/matrix-org/synapse/issues/7882))
- Return an empty body for OPTIONS requests. ([\#7886](https://github.com/matrix-org/synapse/issues/7886))
- Fix typo in generated config file. Contributed by @ThiefMaster. ([\#7890](https://github.com/matrix-org/synapse/issues/7890))
- Import ABC from `collections.abc` for Python 3.10 compatibility. ([\#7892](https://github.com/matrix-org/synapse/issues/7892))
- Remove unused functions `time_function`, `trace_function`, `get_previous_frames`
  and `get_previous_frame` from `synapse.logging.utils` module. ([\#7897](https://github.com/matrix-org/synapse/issues/7897))
- Lint the `contrib/` directory in CI and linting scripts, add `synctl` to the linting script for consistency with CI. ([\#7914](https://github.com/matrix-org/synapse/issues/7914))
- Use Element CSS and logo in notification emails when app name is Element. ([\#7919](https://github.com/matrix-org/synapse/issues/7919))
- Optimisation to /sync handling: skip serializing the response if the client has already disconnected. ([\#7927](https://github.com/matrix-org/synapse/issues/7927))
- When a client disconnects, don't log it as 'Error processing request'. ([\#7928](https://github.com/matrix-org/synapse/issues/7928))
- Add debugging to `/sync` response generation (disabled by default). ([\#7929](https://github.com/matrix-org/synapse/issues/7929))
- Update comments that refer to Deferreds for async functions. ([\#7945](https://github.com/matrix-org/synapse/issues/7945))
- Simplify error handling in federation handler. ([\#7950](https://github.com/matrix-org/synapse/issues/7950))
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