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On upgrade room only send canonical alias once. (#7547)

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Instead of doing a complicated dance of deleting and moving aliases one
by one, which sends a canonical alias update into the old room for each
one, lets do it all in one go.

This also changes the function to move *all* local alias events to the new
room, however that happens later on anyway.
This commit is contained in:
Erik Johnston 2020-05-22 11:41:41 +01:00 committed by GitHub
parent 547e4dd83e
commit 710d958c64
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2 changed files with 60 additions and 54 deletions
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changelog.d/7547.misc Normal file
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@ -0,0 +1 @@
On upgrade room only send canonical alias once.

113
synapse/handlers/room.py
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@ -439,73 +439,78 @@ class RoomCreationHandler(BaseHandler):
new_room_id: str,
old_room_state: StateMap[str],
):
directory_handler = self.hs.get_handlers().directory_handler
aliases = await self.store.get_aliases_for_room(old_room_id)
# check to see if we have a canonical alias.
canonical_alias_event = None
canonical_alias_event_id = old_room_state.get((EventTypes.CanonicalAlias, ""))
if canonical_alias_event_id:
canonical_alias_event = await self.store.get_event(canonical_alias_event_id)
# first we try to remove the aliases from the old room (we suppress sending
# the room_aliases event until the end).
#
# Note that we'll only be able to remove aliases that (a) aren't owned by an AS,
# and (b) unless the user is a server admin, which the user created.
#
# This is probably correct - given we don't allow such aliases to be deleted
# normally, it would be odd to allow it in the case of doing a room upgrade -
# but it makes the upgrade less effective, and you have to wonder why a room
# admin can't remove aliases that point to that room anyway.
# (cf https://github.com/matrix-org/synapse/issues/2360)
#
removed_aliases = []
for alias_str in aliases:
alias = RoomAlias.from_string(alias_str)
try:
await directory_handler.delete_association(requester, alias)
removed_aliases.append(alias_str)
except SynapseError as e:
logger.warning("Unable to remove alias %s from old room: %s", alias, e)
await self.store.update_aliases_for_room(old_room_id, new_room_id)
# if we didn't find any aliases, or couldn't remove anyway, we can skip the rest
# of this.
if not removed_aliases:
if not canonical_alias_event:
return
# we can now add any aliases we successfully removed to the new room.
for alias in removed_aliases:
try:
await directory_handler.create_association(
requester,
RoomAlias.from_string(alias),
new_room_id,
servers=(self.hs.hostname,),
check_membership=False,
)
logger.info("Moved alias %s to new room", alias)
except SynapseError as e:
# I'm not really expecting this to happen, but it could if the spam
# checking module decides it shouldn't, or similar.
logger.error("Error adding alias %s to new room: %s", alias, e)
# If there is a canonical alias we need to update the one in the old
# room and set one in the new one.
old_canonical_alias_content = dict(canonical_alias_event.content)
new_canonical_alias_content = {}
canonical = canonical_alias_event.content.get("alias")
if canonical and self.hs.is_mine_id(canonical):
new_canonical_alias_content["alias"] = canonical
old_canonical_alias_content.pop("alias", None)
# We convert to a list as it will be a Tuple.
old_alt_aliases = list(old_canonical_alias_content.get("alt_aliases", []))
if old_alt_aliases:
old_canonical_alias_content["alt_aliases"] = old_alt_aliases
new_alt_aliases = new_canonical_alias_content.setdefault("alt_aliases", [])
for alias in canonical_alias_event.content.get("alt_aliases", []):
try:
if self.hs.is_mine_id(alias):
new_alt_aliases.append(alias)
old_alt_aliases.remove(alias)
except Exception:
logger.info(
"Invalid alias %s in canonical alias event %s",
alias,
canonical_alias_event_id,
)
if not old_alt_aliases:
old_canonical_alias_content.pop("alt_aliases")
# If a canonical alias event existed for the old room, fire a canonical
# alias event for the new room with a copy of the information.
try:
if canonical_alias_event:
await self.event_creation_handler.create_and_send_nonmember_event(
requester,
{
"type": EventTypes.CanonicalAlias,
"state_key": "",
"room_id": new_room_id,
"sender": requester.user.to_string(),
"content": canonical_alias_event.content,
},
ratelimit=False,
)
await self.event_creation_handler.create_and_send_nonmember_event(
requester,
{
"type": EventTypes.CanonicalAlias,
"state_key": "",
"room_id": old_room_id,
"sender": requester.user.to_string(),
"content": old_canonical_alias_content,
},
ratelimit=False,
)
except SynapseError as e:
# again I'm not really expecting this to fail, but if it does, I'd rather
# we returned the new room to the client at this point.
logger.error("Unable to send updated alias events in old room: %s", e)
try:
await self.event_creation_handler.create_and_send_nonmember_event(
requester,
{
"type": EventTypes.CanonicalAlias,
"state_key": "",
"room_id": new_room_id,
"sender": requester.user.to_string(),
"content": new_canonical_alias_content,
},
ratelimit=False,
)
except SynapseError as e:
# again I'm not really expecting this to fail, but if it does, I'd rather
# we returned the new room to the client at this point.