diff --git a/synapse/handlers/room.py b/synapse/handlers/room.py
index d42c2c41c4..3cce6f6150 100644
--- a/synapse/handlers/room.py
+++ b/synapse/handlers/room.py
@@ -36,6 +36,7 @@ from synapse.api.errors import AuthError, Codes, StoreError, SynapseError
from synapse.storage.state import StateFilter
from synapse.types import RoomAlias, RoomID, RoomStreamToken, StreamToken, UserID
from synapse.util import stringutils
+from synapse.util.async_helpers import Linearizer
from synapse.visibility import filter_events_for_client
from ._base import BaseHandler
@@ -75,6 +76,124 @@ class RoomCreationHandler(BaseHandler):
self.event_creation_handler = hs.get_event_creation_handler()
self.room_member_handler = hs.get_room_member_handler()
+ # linearizer to stop two upgrades happening at once
+ self._upgrade_linearizer = Linearizer("room_upgrade_linearizer")
+
+ @defer.inlineCallbacks
+ def upgrade_room(self, requester, old_room_id, new_version):
+ """Replace a room with a new room with a different version
+
+ Args:
+ requester (synapse.types.Requester): the user requesting the upgrade
+ old_room_id (unicode): the id of the room to be replaced
+ new_version (unicode): the new room version to use
+
+ Returns:
+ Deferred[unicode]: the new room id
+ """
+ yield self.ratelimit(requester)
+
+ user_id = requester.user.to_string()
+
+ with (yield self._upgrade_linearizer.queue(old_room_id)):
+ # start by allocating a new room id
+ is_public = False # XXX fixme
+ new_room_id = yield self._generate_room_id(
+ creator_id=user_id, is_public=is_public,
+ )
+
+ # we create and auth the tombstone event before properly creating the new
+ # room, to check our user has perms in the old room.
+ tombstone_event, tombstone_context = (
+ yield self.event_creation_handler.create_event(
+ requester, {
+ "type": EventTypes.Tombstone,
+ "state_key": "",
+ "room_id": old_room_id,
+ "sender": user_id,
+ "content": {
+ "body": "This room has been replaced",
+ "replacement_room": new_room_id,
+ }
+ },
+ token_id=requester.access_token_id,
+ )
+ )
+ yield self.auth.check_from_context(tombstone_event, tombstone_context)
+
+ yield self.clone_exiting_room(
+ requester,
+ old_room_id=old_room_id,
+ new_room_id=new_room_id,
+ new_room_version=new_version,
+ tombstone_event_id=tombstone_event.event_id,
+ )
+
+ # now send the tombstone
+ yield self.event_creation_handler.send_nonmember_event(
+ requester, tombstone_event, tombstone_context,
+ )
+
+ # XXX send a power_levels in the old room, if possible
+
+ defer.returnValue(new_room_id)
+
+ @defer.inlineCallbacks
+ def clone_exiting_room(
+ self, requester, old_room_id, new_room_id, new_room_version,
+ tombstone_event_id,
+ ):
+ """Populate a new room based on an old room
+
+ Args:
+ requester (synapse.types.Requester): the user requesting the upgrade
+ old_room_id (unicode): the id of the room to be replaced
+ new_room_id (unicode): the id to give the new room (should already have been
+ created with _gemerate_room_id())
+ new_room_version (unicode): the new room version to use
+ tombstone_event_id (unicode|str): the ID of the tombstone event in the old
+ room.
+ Returns:
+ Deferred[None]
+ """
+ user_id = requester.user.to_string()
+
+ if not self.spam_checker.user_may_create_room(user_id):
+ raise SynapseError(403, "You are not permitted to create rooms")
+
+ # XXX check alias is free
+ # canonical_alias = None
+
+ # XXX create association in directory handler
+ # XXX preset
+
+ preset_config = RoomCreationPreset.PRIVATE_CHAT
+
+ creation_content = {
+ "room_version": new_room_version,
+ "predecessor": {
+ "room_id": old_room_id,
+ "event_id": tombstone_event_id,
+ }
+ }
+
+ initial_state = OrderedDict()
+
+ yield self._send_events_for_new_room(
+ requester,
+ new_room_id,
+ preset_config=preset_config,
+ invite_list=[],
+ initial_state=initial_state,
+ creation_content=creation_content,
+ )
+
+ # XXX name
+ # XXX topic
+ # XXX invites/joins
+ # XXX 3pid invites
+ # XXX directory_handler.send_room_alias_update_event
+
@defer.inlineCallbacks
def create_room(self, requester, config, ratelimit=True,
creator_join_profile=None):
@@ -416,6 +535,8 @@ class RoomCreationHandler(BaseHandler):
random_string,
self.hs.hostname,
).to_string()
+ if isinstance(gen_room_id, bytes):
+ gen_room_id = gen_room_id.decode('utf-8')
yield self.store.store_room(
room_id=gen_room_id,
room_creator_user_id=creator_id,
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