Synapse 1.56.0rc1 (2022-03-29)

Synapse will now refuse to start up if open registration is enabled, in order to help mitigate abuse across the federation. If you would like to provide registration to anyone, consider adding email, recaptcha or token-based verification in order to prevent automated registration from bad actors.

This check can be disabled by setting the enable_registration_without_verification option in yourhomeserver configuration file to true. More details are available in the upgrade notes.

Features

• Allow modules to store already existing 3PID associations. (#12195)
• Allow registering server administrators using the module API. Contributed by Famedly. (#12250)

Bugfixes

• Fix a long-standing bug which caused the /_matrix/federation/v1/state and /_matrix/federation/v1/state_ids endpoints to return incorrect or invalid data when called for an event which we have stored as an "outlier". (#12087)
• Fix a long-standing bug where events from ignored users would still be considered for relations. (#12227, #12232, #12285)
• Fix a bug introduced in Synapse 1.53.0 where an unnecessary query could be performed when fetching bundled aggregations for threads. (#12228)
• Fix a bug introduced in Synapse 1.52.0 where admins could not deactivate and GDPR-erase a user if Synapse was configured with limits on avatars. (#12261)

Improved Documentation

• Fix the link to the module documentation in the legacy spam checker warning message. (#12231)
• Remove incorrect prefixes in the worker documentation for some endpoints. (#12243)
• Correct check_username_for_spam annotations and docs. (#12246)
• Correct Authentik OpenID typo, and add notes on troubleshooting. Contributed by @IronTooch. (#12275)
• HAProxy reverse proxy guide update to stop sending IPv4-mapped address to homeserver. Contributed by @villepeh. (#12279)

Internal Changes

• Rename shared_rooms to mutual_rooms (MSC2666), as per proposal changes. (#12036)
• Remove check on update_user_directory for shared rooms handler (MSC2666), and update/expand documentation. (#12038)
• Refactor create_new_client_event to use a new parameter, state_event_ids, which accurately describes the usage with MSC2716 instead of abusing auth_event_ids. (#12083, #12304)
• Refuse to start if registration is enabled without email, captcha, or token-based verification unless the new config flag enable_registration_without_verification is set. (#12091)
• Add tests for database transaction callbacks. (#12198)
• Handle cancellation in DatabasePool.runInteraction. (#12199)
• Add missing type hints for cache storage. (#12216)
• Add missing type hints for storage. (#12248, #12255)
• Add type hints to tests files. (#12224, #12240, #12256)
• Use type stubs for psycopg2. (#12269)
• Improve type annotations for execute_values. (#12311)
• Clean-up logic around rebasing URLs for URL image previews. (#12219)
• Use the ignored_users table in additional places instead of re-parsing the account data. (#12225)
• Refactor the relations endpoints to add a RelationsHandler. (#12237)
• Generate announcement links in the release script. (#12242)
• Improve error message when dependencies check finds a broken installation. (#12244)
• Compress metrics HTTP resource when enabled. Contributed by Nick @ Beeper. (#12258)
• Refuse to start if the PostgreSQL database has a non-C locale, unless the config flag allow_unsafe_db_locale is set to true. (#12262, #12288)
• Optionally include account validity expiration information to experimental MSC3720 account status responses. (#12266)
• Add a new cache _get_membership_from_event_id to speed up push rule calculations in large rooms. (#12272)
• Re-enable Complement concurrency in CI. (#12283)
• Remove unused test utilities. (#12291)
• Enhance logging for inbound federation events. (#12301)
• Fix compatibility with the recently-released Jinja 3.1. (#12313)
• Avoid trying to calculate the state at outlier events. (#12314)