Bring auto-accept invite logic into Synapse (#17147)

This PR ports the logic from the
[synapse_auto_accept_invite](https://github.com/matrix-org/synapse-auto-accept-invite)
module into synapse.

I went with the naive approach of injecting the "module" next to where
third party modules are currently loaded. If there is a better/preferred
way to handle this, I'm all ears. It wasn't obvious to me if there was a
better location to add this logic that would cleanly apply to all
incoming invite events.

Relies on https://github.com/element-hq/synapse/pull/17166 to fix linter
errors.

1 files changed, 6 insertions, 0 deletions

diff --git a/synapse/app/_base.py b/synapse/app/_base.py

index 3182608f73..67e0df1459 100644
--- a/synapse/app/_base.py
+++ b/synapse/app/_base.py
@@ -68,6 +68,7 @@ from synapse.config._base import format_config_error
 from synapse.config.homeserver import HomeServerConfig
 from synapse.config.server import ListenerConfig, ManholeConfig, TCPListenerConfig
 from synapse.crypto import context_factory
+from synapse.events.auto_accept_invites import InviteAutoAccepter
 from synapse.events.presence_router import load_legacy_presence_router
 from synapse.handlers.auth import load_legacy_password_auth_providers
 from synapse.http.site import SynapseSite
@@ -582,6 +583,11 @@ async def start(hs: "HomeServer") -> None:
         m = module(config, module_api)
         logger.info("Loaded module %s", m)
 
+    if hs.config.auto_accept_invites.enabled:
+        # Start the local auto_accept_invites module.
+        m = InviteAutoAccepter(hs.config.auto_accept_invites, module_api)
+        logger.info("Loaded local module %s", m)
+
     load_legacy_spam_checkers(hs)
     load_legacy_third_party_event_rules(hs)
     load_legacy_presence_router(hs)