Add variables for controlling the native auto-accept-invites Synapse feature

Related to https://github.com/element-hq/synapse/pull/17147

roles/custom/matrix-synapse/defaults/main.yml

@@ -543,6 +543,27 @@ matrix_synapse_auto_join_rooms: []
 # automatically if they don't already exist.
 matrix_synapse_autocreate_auto_join_rooms: true
 
+# Controls whether room invites will be accepted on behalf of users.
+# See: https://element-hq.github.io/synapse/latest/usage/configuration/config_documentation.html#auto-accept-invites
+# This should not be used together with the `synapse_auto_accept_invite` module (see `matrix_synapse_ext_synapse_auto_accept_invite_enabled`).
+# Also see:
+# - `matrix_synapse_auto_accept_invites_only_for_direct_messages`
+# - `matrix_synapse_auto_accept_invites_only_from_local_users`
+# - `matrix_synapse_auto_accept_invites_worker_to_run_on`
+matrix_synapse_auto_accept_invites_enabled: false
+
+# Controls whether auto-invite acceptance should only be done for direct messages.
+# Related to: `matrix_synapse_auto_accept_invites_enabled`
+matrix_synapse_auto_accept_invites_only_for_direct_messages: false
+
+# Controls whether auto-invite acceptance should only be done when the invitatio nis coming from a local user.
+# Related to: `matrix_synapse_auto_accept_invites_enabled`
+matrix_synapse_auto_accept_invites_only_from_local_users: false
+
+# When Synapse workers enabled it is possible (but not required) to assign a worker to run the auto-accept-invites feature on (null = main process).
+# Related to: `matrix_synapse_auto_accept_invites_enabled`
+matrix_synapse_auto_accept_invites_worker_to_run_on: null
+
 # Controls whether password authentication is allowed
 # It may be useful when you've configured OAuth, SAML or CAS and want authentication
 # to happen only through them
@@ -1228,6 +1249,10 @@ matrix_synapse_ext_synapse_s3_storage_provider_update_db_day_count: 0
 matrix_synapse_ext_synapse_s3_storage_provider_periodic_migration_schedule: '*-*-* 05:00:00'
 
 # Synapse module to automatically accept room invites.
+#
+# Since Synapse v1.109.0 (https://github.com/element-hq/synapse/pull/17147),
+# this functionality has been merged into Synapse. See `matrix_synapse_auto_accept_invites_enabled`.
+#
 # See: https://github.com/matrix-org/synapse-auto-accept-invite
 # Installing it requires building a customized Docker image for Synapse (see `matrix_synapse_container_image_customizations_enabled`).
 # Enabling this will enable customizations and inject the appropriate Dockerfile clauses for installing synapse-auto-accept-invite.

roles/custom/matrix-synapse/tasks/validate_config.yml

@@ -121,3 +121,15 @@
       when: "matrix_synapse_container_image_customizations_templates_git_repository_keyscan_enabled | bool and vars[item] == ''"
       with_items:
         - matrix_synapse_container_image_customizations_templates_git_repository_keyscan_hostname
+
+
+- name: Fail when auto-accept-invite enabled as a native feature and a module at the same time
+  ansible.builtin.fail:
+    msg: >-
+      Your configuration enables the auto-accept invites feature both as a native Synapse feature (`matrix_synapse_auto_accept_invites_enabled`) and a 3rd party module (`matrix_synapse_ext_synapse_auto_accept_invite_enabled`).
+      This is unnecessary, since they both do the same and the native feature is built on top of the 3rd party module anyway.
+      Enabling both at the same time will lead to issues.
+      We recommend leaving `matrix_synapse_auto_accept_invites_enabled` in your configuration and removing `matrix_synapse_ext_synapse_auto_accept_invite_enabled`.
+  when:
+    - matrix_synapse_auto_accept_invites_enabled
+    - matrix_synapse_ext_synapse_auto_accept_invite_enabled

roles/custom/matrix-synapse/templates/synapse/homeserver.yaml.j2

@@ -1550,6 +1550,12 @@ autocreate_auto_join_rooms: {{ matrix_synapse_autocreate_auto_join_rooms|to_json
 #
 #auto_join_rooms_for_guests: false
 
+auto_accept_invites:
+    enabled: {{ matrix_synapse_auto_accept_invites_enabled | to_json }}
+    only_for_direct_messages: {{ matrix_synapse_auto_accept_invites_only_for_direct_messages | to_json }}
+    only_from_local_users: {{ matrix_synapse_auto_accept_invites_only_from_local_users | to_json }}
+    worker_to_run_on: {{ matrix_synapse_auto_accept_invites_worker_to_run_on | to_json }}
+
 # Whether to inhibit errors raised when registering a new account if the user ID
 # already exists. If turned on, that requests to /register/available will always
 # show a user ID as available, and Synapse won't raise an error when starting
@@ -1565,7 +1571,7 @@ autocreate_auto_join_rooms: {{ matrix_synapse_autocreate_auto_join_rooms|to_json
 
 # Enable collection and rendering of performance metrics
 #
-enable_metrics: {{ matrix_synapse_metrics_enabled|to_json  }}
+enable_metrics: {{ matrix_synapse_metrics_enabled|to_json }}
 
 # Enable sentry integration
 # NOTE: While attempts are made to ensure that the logs don't contain