Merge remote-tracking branch 'origin/release-v1.28.0' into toml/keycloak_hints github/toml/keycloak_hints toml/keycloak_hints

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diff --git a/CHANGES.md b/CHANGES.md
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+Synapse 1.28.0 (2021-02-25)
+===========================
+
+Note that this release drops support for ARMv7 in the official Docker images, due to repeated problems building for ARMv7 (and the associated maintenance burden this entails).
+
+This release also fixes the documentation included in v1.27.0 around the callback URI for SAML2 identity providers. If your server is configured to use single sign-on via a SAML2 IdP, you may need to make configuration changes. Please review [UPGRADE.rst](UPGRADE.rst) for more details on these changes.
+
+
+Internal Changes
+----------------
+
+- Revert change in v1.28.0rc1 to remove the deprecated SAML endpoint. ([\#9474](https://github.com/matrix-org/synapse/issues/9474))
+
+
+Synapse 1.28.0rc1 (2021-02-19)
+==============================
+
+Removal warning
+---------------
+
+The v1 list accounts API is deprecated and will be removed in a future release.
+This API was undocumented and misleading. It can be replaced by the
+[v2 list accounts API](https://github.com/matrix-org/synapse/blob/release-v1.28.0/docs/admin_api/user_admin_api.rst#list-accounts),
+which has been available since Synapse 1.7.0 (2019-12-13).
+
+Please check if you're using any scripts which use the admin API and replace
+`GET /_synapse/admin/v1/users/<user_id>` with `GET /_synapse/admin/v2/users`.
+
+
+Features
+--------
+
+- New admin API to get the context of an event: `/_synapse/admin/rooms/{roomId}/context/{eventId}`. ([\#9150](https://github.com/matrix-org/synapse/issues/9150))
+- Further improvements to the user experience of registration via single sign-on. ([\#9300](https://github.com/matrix-org/synapse/issues/9300), [\#9301](https://github.com/matrix-org/synapse/issues/9301))
+- Add hook to spam checker modules that allow checking file uploads and remote downloads. ([\#9311](https://github.com/matrix-org/synapse/issues/9311))
+- Add support for receiving OpenID Connect authentication responses via form `POST`s rather than `GET`s. ([\#9376](https://github.com/matrix-org/synapse/issues/9376))
+- Add the shadow-banning status to the admin API for user info. ([\#9400](https://github.com/matrix-org/synapse/issues/9400))
+
+
+Bugfixes
+--------
+
+- Fix long-standing bug where sending email notifications would fail for rooms that the server had since left. ([\#9257](https://github.com/matrix-org/synapse/issues/9257))
+- Fix bug introduced in Synapse 1.27.0rc1 which meant the "session expired" error page during SSO registration was badly formatted. ([\#9296](https://github.com/matrix-org/synapse/issues/9296))
+- Assert a maximum length for some parameters for spec compliance. ([\#9321](https://github.com/matrix-org/synapse/issues/9321), [\#9393](https://github.com/matrix-org/synapse/issues/9393))
+- Fix additional errors when previewing URLs: "AttributeError 'NoneType' object has no attribute 'xpath'" and "ValueError: Unicode strings with encoding declaration are not supported. Please use bytes input or XML fragments without declaration.". ([\#9333](https://github.com/matrix-org/synapse/issues/9333))
+- Fix a bug causing Synapse to impose the wrong type constraints on fields when processing responses from appservices to `/_matrix/app/v1/thirdparty/user/{protocol}`. ([\#9361](https://github.com/matrix-org/synapse/issues/9361))
+- Fix bug where Synapse would occasionally stop reconnecting to Redis after the connection was lost. ([\#9391](https://github.com/matrix-org/synapse/issues/9391))
+- Fix a long-standing bug when upgrading a room: "TypeError: '>' not supported between instances of 'NoneType' and 'int'". ([\#9395](https://github.com/matrix-org/synapse/issues/9395))
+- Reduce the amount of memory used when generating the URL preview of a file that is larger than the `max_spider_size`. ([\#9421](https://github.com/matrix-org/synapse/issues/9421))
+- Fix a long-standing bug in the deduplication of old presence, resulting in no deduplication. ([\#9425](https://github.com/matrix-org/synapse/issues/9425))
+- The `ui_auth.session_timeout` config option can now be specified in terms of number of seconds/minutes/etc/. Contributed by Rishabh Arya. ([\#9426](https://github.com/matrix-org/synapse/issues/9426))
+- Fix a bug introduced in v1.27.0: "TypeError: int() argument must be a string, a bytes-like object or a number, not 'NoneType." related to the user directory. ([\#9428](https://github.com/matrix-org/synapse/issues/9428))
+
+
+Updates to the Docker image
+---------------------------
+
+- Drop support for ARMv7 in Docker images. ([\#9433](https://github.com/matrix-org/synapse/issues/9433))
+
+
+Improved Documentation
+----------------------
+
+- Reorganize CHANGELOG.md. ([\#9281](https://github.com/matrix-org/synapse/issues/9281))
+- Add note to `auto_join_rooms` config option explaining existing rooms must be publicly joinable. ([\#9291](https://github.com/matrix-org/synapse/issues/9291))
+- Correct name of Synapse's service file in TURN howto. ([\#9308](https://github.com/matrix-org/synapse/issues/9308))
+- Fix the braces in the `oidc_providers` section of the sample config. ([\#9317](https://github.com/matrix-org/synapse/issues/9317))
+- Update installation instructions on Fedora. ([\#9322](https://github.com/matrix-org/synapse/issues/9322))
+- Add HTTP/2 support to the nginx example configuration. Contributed by David Vo. ([\#9390](https://github.com/matrix-org/synapse/issues/9390))
+- Update docs for using Gitea as OpenID provider. ([\#9404](https://github.com/matrix-org/synapse/issues/9404))
+- Document that pusher instances are shardable. ([\#9407](https://github.com/matrix-org/synapse/issues/9407))
+- Fix erroneous documentation from v1.27.0 about updating the SAML2 callback URL. ([\#9434](https://github.com/matrix-org/synapse/issues/9434))
+
+
+Deprecations and Removals
+-------------------------
+
+- Deprecate old admin API `GET /_synapse/admin/v1/users/<user_id>`. ([\#9429](https://github.com/matrix-org/synapse/issues/9429))
+
+
+Internal Changes
+----------------
+
+- Fix 'object name reserved for internal use' errors with recent versions of SQLite. ([\#9003](https://github.com/matrix-org/synapse/issues/9003))
+- Add experimental support for running Synapse with PyPy. ([\#9123](https://github.com/matrix-org/synapse/issues/9123))
+- Deny access to additional IP addresses by default. ([\#9240](https://github.com/matrix-org/synapse/issues/9240))
+- Update the `Cursor` type hints to better match PEP 249. ([\#9299](https://github.com/matrix-org/synapse/issues/9299))
+- Add debug logging for SRV lookups. Contributed by @Bubu. ([\#9305](https://github.com/matrix-org/synapse/issues/9305))
+- Improve logging for OIDC login flow. ([\#9307](https://github.com/matrix-org/synapse/issues/9307))
+- Share the code for handling required attributes between the CAS and SAML handlers. ([\#9326](https://github.com/matrix-org/synapse/issues/9326))
+- Clean up the code to load the metadata for OpenID Connect identity providers. ([\#9362](https://github.com/matrix-org/synapse/issues/9362))
+- Convert tests to use `HomeserverTestCase`. ([\#9377](https://github.com/matrix-org/synapse/issues/9377), [\#9396](https://github.com/matrix-org/synapse/issues/9396))
+- Update the version of black used to 20.8b1. ([\#9381](https://github.com/matrix-org/synapse/issues/9381))
+- Allow OIDC config to override discovered values. ([\#9384](https://github.com/matrix-org/synapse/issues/9384))
+- Remove some dead code from the acceptance of room invites path. ([\#9394](https://github.com/matrix-org/synapse/issues/9394))
+- Clean up an unused method in the presence handler code. ([\#9408](https://github.com/matrix-org/synapse/issues/9408))
+
+
+Synapse 1.27.0 (2021-02-16)
+===========================
+
+Note that this release includes a change in Synapse to use Redis as a cache ─ as well as a pub/sub mechanism ─ if Redis support is enabled for workers. No action is needed by server administrators, and we do not expect resource usage of the Redis instance to change dramatically.
+
+This release also changes the callback URI for OpenID Connect (OIDC) and SAML2 identity providers. If your server is configured to use single sign-on via an OIDC/OAuth2 or SAML2 IdP, you may need to make configuration changes. Please review [UPGRADE.rst](UPGRADE.rst) for more details on these changes.
+
+This release also changes escaping of variables in the HTML templates for SSO or email notifications. If you have customised these templates, please review [UPGRADE.rst](UPGRADE.rst) for more details on these changes.
+
+
+Bugfixes
+--------
+
+- Fix building Docker images for armv7. ([\#9405](https://github.com/matrix-org/synapse/issues/9405))
+
+
+Synapse 1.27.0rc2 (2021-02-11)
+==============================
+
+Features
+--------
+
+- Further improvements to the user experience of registration via single sign-on. ([\#9297](https://github.com/matrix-org/synapse/issues/9297))
+
+
+Bugfixes
+--------
+
+- Fix ratelimiting introduced in v1.27.0rc1 for invites to respect the `ratelimit` flag on application services. ([\#9302](https://github.com/matrix-org/synapse/issues/9302))
+- Do not automatically calculate `public_baseurl` since it can be wrong in some situations. Reverts behaviour introduced in v1.26.0. ([\#9313](https://github.com/matrix-org/synapse/issues/9313))
+
+
+Improved Documentation
+----------------------
+
+- Clarify the sample configuration for changes made to the template loading code. ([\#9310](https://github.com/matrix-org/synapse/issues/9310))
+
+
+Synapse 1.27.0rc1 (2021-02-02)
+==============================
+
+Features
+--------
+
+- Add an admin API for getting and deleting forward extremities for a room. ([\#9062](https://github.com/matrix-org/synapse/issues/9062))
+- Add an admin API for retrieving the current room state of a room. ([\#9168](https://github.com/matrix-org/synapse/issues/9168))
+- Add experimental support for allowing clients to pick an SSO Identity Provider ([MSC2858](https://github.com/matrix-org/matrix-doc/pull/2858)). ([\#9183](https://github.com/matrix-org/synapse/issues/9183), [\#9242](https://github.com/matrix-org/synapse/issues/9242))
+- Add an admin API endpoint for shadow-banning users. ([\#9209](https://github.com/matrix-org/synapse/issues/9209))
+- Add ratelimits to the 3PID `/requestToken` APIs. ([\#9238](https://github.com/matrix-org/synapse/issues/9238))
+- Add support to the OpenID Connect integration for adding the user's email address. ([\#9245](https://github.com/matrix-org/synapse/issues/9245))
+- Add ratelimits to invites in rooms and to specific users. ([\#9258](https://github.com/matrix-org/synapse/issues/9258))
+- Improve the user experience of setting up an account via single-sign on. ([\#9262](https://github.com/matrix-org/synapse/issues/9262), [\#9272](https://github.com/matrix-org/synapse/issues/9272), [\#9275](https://github.com/matrix-org/synapse/issues/9275), [\#9276](https://github.com/matrix-org/synapse/issues/9276), [\#9277](https://github.com/matrix-org/synapse/issues/9277), [\#9286](https://github.com/matrix-org/synapse/issues/9286), [\#9287](https://github.com/matrix-org/synapse/issues/9287))
+- Add phone home stats for encrypted messages. ([\#9283](https://github.com/matrix-org/synapse/issues/9283))
+- Update the redirect URI for OIDC authentication. ([\#9288](https://github.com/matrix-org/synapse/issues/9288))
+
+
+Bugfixes
+--------
+
+- Fix spurious errors in logs when deleting a non-existant pusher. ([\#9121](https://github.com/matrix-org/synapse/issues/9121))
+- Fix a long-standing bug where Synapse would return a 500 error when a thumbnail did not exist (and auto-generation of thumbnails was not enabled). ([\#9163](https://github.com/matrix-org/synapse/issues/9163))
+- Fix a long-standing bug where an internal server error was raised when attempting to preview an HTML document in an unknown character encoding. ([\#9164](https://github.com/matrix-org/synapse/issues/9164))
+- Fix a long-standing bug where invalid data could cause errors when calculating the presentable room name for push. ([\#9165](https://github.com/matrix-org/synapse/issues/9165))
+- Fix bug where we sometimes didn't detect that Redis connections had died, causing workers to not see new data. ([\#9218](https://github.com/matrix-org/synapse/issues/9218))
+- Fix a bug where `None` was passed to Synapse modules instead of an empty dictionary if an empty module `config` block was provided in the homeserver config. ([\#9229](https://github.com/matrix-org/synapse/issues/9229))
+- Fix a bug in the `make_room_admin` admin API where it failed if the admin with the greatest power level was not in the room. Contributed by Pankaj Yadav. ([\#9235](https://github.com/matrix-org/synapse/issues/9235))
+- Prevent password hashes from getting dropped if a client failed threepid validation during a User Interactive Auth stage. Removes a workaround for an ancient bug in Riot Web <v0.7.4. ([\#9265](https://github.com/matrix-org/synapse/issues/9265))
+- Fix single-sign-on when the endpoints are routed to synapse workers. ([\#9271](https://github.com/matrix-org/synapse/issues/9271))
+
+
+Improved Documentation
+----------------------
+
+- Add docs for using Gitea as OpenID provider. ([\#9134](https://github.com/matrix-org/synapse/issues/9134))
+- Add link to Matrix VoIP tester for turn-howto. ([\#9135](https://github.com/matrix-org/synapse/issues/9135))
+- Add notes on integrating with Facebook for SSO login. ([\#9244](https://github.com/matrix-org/synapse/issues/9244))
+
+
+Deprecations and Removals
+-------------------------
+
+- The `service_url` parameter in `cas_config` is deprecated in favor of `public_baseurl`. ([\#9199](https://github.com/matrix-org/synapse/issues/9199))
+- Add new endpoint `/_synapse/client/saml2` for SAML2 authentication callbacks, and deprecate the old endpoint `/_matrix/saml2`. ([\#9289](https://github.com/matrix-org/synapse/issues/9289))
+
+
+Internal Changes
+----------------
+
+- Add tests to `test_user.UsersListTestCase` for List Users Admin API. ([\#9045](https://github.com/matrix-org/synapse/issues/9045))
+- Various improvements to the federation client. ([\#9129](https://github.com/matrix-org/synapse/issues/9129))
+- Speed up chain cover calculation when persisting a batch of state events at once. ([\#9176](https://github.com/matrix-org/synapse/issues/9176))
+- Add a `long_description_type` to the package metadata. ([\#9180](https://github.com/matrix-org/synapse/issues/9180))
+- Speed up batch insertion when using PostgreSQL. ([\#9181](https://github.com/matrix-org/synapse/issues/9181), [\#9188](https://github.com/matrix-org/synapse/issues/9188))
+- Emit an error at startup if different Identity Providers are configured with the same `idp_id`. ([\#9184](https://github.com/matrix-org/synapse/issues/9184))
+- Improve performance of concurrent use of `StreamIDGenerators`. ([\#9190](https://github.com/matrix-org/synapse/issues/9190))
+- Add some missing source directories to the automatic linting script. ([\#9191](https://github.com/matrix-org/synapse/issues/9191))
+- Precompute joined hosts and store in Redis. ([\#9198](https://github.com/matrix-org/synapse/issues/9198), [\#9227](https://github.com/matrix-org/synapse/issues/9227))
+- Clean-up template loading code. ([\#9200](https://github.com/matrix-org/synapse/issues/9200))
+- Fix the Python 3.5 old dependencies build. ([\#9217](https://github.com/matrix-org/synapse/issues/9217))
+- Update `isort` to v5.7.0 to bypass a bug where it would disagree with `black` about formatting. ([\#9222](https://github.com/matrix-org/synapse/issues/9222))
+- Add type hints to handlers code. ([\#9223](https://github.com/matrix-org/synapse/issues/9223), [\#9232](https://github.com/matrix-org/synapse/issues/9232))
+- Fix Debian package building on Ubuntu 16.04 LTS (Xenial). ([\#9254](https://github.com/matrix-org/synapse/issues/9254))
+- Minor performance improvement during TLS handshake. ([\#9255](https://github.com/matrix-org/synapse/issues/9255))
+- Refactor the generation of summary text for email notifications. ([\#9260](https://github.com/matrix-org/synapse/issues/9260))
+- Restore PyPy compatibility by not calling CPython-specific GC methods when under PyPy. ([\#9270](https://github.com/matrix-org/synapse/issues/9270))
+
+
 Synapse 1.26.0 (2021-01-27)
 ===========================