Add an option to disable autojoin for guest accounts

changelog.d/6637.feature

@@ -0,0 +1 @@
+Add an option to disable autojoining rooms for guest accounts.

docs/sample_config.yaml

@@ -1039,6 +1039,11 @@ account_threepid_delegates:
 #
 #autocreate_auto_join_rooms: true
 
+# When auto_join_rooms is specified, setting this flag to False prevents
+# guest accounts from being automatically joined to the rooms. Default
+# true when auto_join_rooms is specified.
+#auto_join_rooms_for_guests: false
+
 
 ## Metrics ###
 

synapse/config/registration.py

@@ -125,6 +125,7 @@ def read_config(self, config, **kwargs):
             if not RoomAlias.is_valid(room_alias):
                 raise ConfigError("Invalid auto_join_rooms entry %s" % (room_alias,))
         self.autocreate_auto_join_rooms = config.get("autocreate_auto_join_rooms", True)
+        self.auto_join_rooms_for_guests = config.get("auto_join_rooms_for_guests", True)
 
         self.disable_msisdn_registration = config.get(
             "disable_msisdn_registration", False
@@ -323,6 +324,11 @@ def generate_config_section(self, generate_secrets=False, **kwargs):
         # users cannot be auto-joined since they do not exist.
         #
         #autocreate_auto_join_rooms: true
+
+        # When auto_join_rooms is specified, setting this flag to False prevents
+        # guest accounts from being automatically joined to the rooms. Default
+        # true when auto_join_rooms is specified.
+        #auto_join_rooms_for_guests: false
         """
             % locals()
         )

synapse/handlers/register.py

@@ -248,7 +248,13 @@ def register_user(
                     fail_count += 1
 
         if not self.hs.config.user_consent_at_registration:
-            yield self._auto_join_rooms(user_id)
+            if not self.hs.config.auto_join_rooms_for_guests and make_guest:
+                logger.info(
+                    "Skipping auto-join for %s because auto-join for guests is disabled",
+                    user_id,
+                )
+            else:
+                yield self._auto_join_rooms(user_id)
         else:
             logger.info(
                 "Skipping auto-join for %s because consent is required at registration",

tests/handlers/test_register.py

@@ -135,6 +135,16 @@ def test_register_mau_blocked(self):
             self.handler.register_user(localpart="local_part"), ResourceLimitError
         )
 
+    def test_auto_join_rooms_for_guests(self):
+        room_alias_str = "#room:test"
+        self.hs.config.auto_join_rooms = [room_alias_str]
+        self.hs.config.auto_join_rooms_for_guests = False
+        user_id = self.get_success(
+            self.handler.register_user(localpart="jeff", make_guest=True),
+        )
+        rooms = self.get_success(self.store.get_rooms_for_user(user_id))
+        self.assertEqual(len(rooms), 0)
+
     def test_auto_create_auto_join_rooms(self):
         room_alias_str = "#room:test"
         self.hs.config.auto_join_rooms = [room_alias_str]

tests/utils.py

@@ -136,6 +136,7 @@ def default_config(name, parse=False):
         "media_storage_providers": [],
         "autocreate_auto_join_rooms": True,
         "auto_join_rooms": [],
+        "auto_join_rooms_for_guest": True,
         "limit_usage_by_mau": False,
         "hs_disabled": False,
         "hs_disabled_message": "",