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-rw-r--r--synapse/handlers/register.py30
1 files changed, 29 insertions, 1 deletions
diff --git a/synapse/handlers/register.py b/synapse/handlers/register.py
index da914c46ff..e9d7b25a36 100644
--- a/synapse/handlers/register.py
+++ b/synapse/handlers/register.py
@@ -50,6 +50,7 @@ class RegistrationHandler(BaseHandler):
         self._auth_handler = hs.get_auth_handler()
         self.profile_handler = hs.get_profile_handler()
         self.user_directory_handler = hs.get_user_directory_handler()
+        self.room_creation_handler = self.hs.get_room_creation_handler()
         self.captcha_client = CaptchaServerHttpClient(hs)
 
         self._next_generated_user_id = None
@@ -220,9 +221,36 @@ class RegistrationHandler(BaseHandler):
 
         # auto-join the user to any rooms we're supposed to dump them into
         fake_requester = create_requester(user_id)
+
+        # try to create the room if we're the first user on the server
+        should_auto_create_rooms = False
+        if self.hs.config.autocreate_auto_join_rooms:
+            count = yield self.store.count_all_users()
+            should_auto_create_rooms = count == 1
+
         for r in self.hs.config.auto_join_rooms:
             try:
-                yield self._join_user_to_room(fake_requester, r)
+                if should_auto_create_rooms:
+                    room_alias = RoomAlias.from_string(r)
+                    if self.hs.hostname != room_alias.domain:
+                        logger.warning(
+                            'Cannot create room alias %s, '
+                            'it does not match server domain',
+                            r,
+                        )
+                    else:
+                        # create room expects the localpart of the room alias
+                        room_alias_localpart = room_alias.localpart
+                        yield self.room_creation_handler.create_room(
+                            fake_requester,
+                            config={
+                                "preset": "public_chat",
+                                "room_alias_name": room_alias_localpart
+                            },
+                            ratelimit=False,
+                        )
+                else:
+                    yield self._join_user_to_room(fake_requester, r)
             except Exception as e:
                 logger.error("Failed to join new user to %r: %r", r, e)