Attempt to move room aliases on room upgrades

This commit is contained in:
Richard van der Hoff 2018-10-26 15:11:35 +01:00
parent 7fbfea062e
commit 94c7fadc98
3 changed files with 142 additions and 14 deletions

1
changelog.d/4101.feature Normal file
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@ -0,0 +1 @@
Support for replacing rooms with new ones

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@ -138,9 +138,30 @@ class DirectoryHandler(BaseHandler):
)
@defer.inlineCallbacks
def delete_association(self, requester, room_alias):
# association deletion for human users
def delete_association(self, requester, room_alias, send_event=True):
"""Remove an alias from the directory
(this is only meant for human users; AS users should call
delete_appservice_association)
Args:
requester (Requester):
room_alias (RoomAlias):
send_event (bool): Whether to send an updated m.room.aliases event.
Note that, if we delete the canonical alias, we will always attempt
to send an m.room.canonical_alias event
Returns:
Deferred[unicode]: room id that the alias used to point to
Raises:
NotFoundError: if the alias doesn't exist
AuthError: if the user doesn't have perms to delete the alias (ie, the user
is neither the creator of the alias, nor a server admin.
SynapseError: if the alias belongs to an AS
"""
user_id = requester.user.to_string()
try:
@ -168,10 +189,11 @@ class DirectoryHandler(BaseHandler):
room_id = yield self._delete_association(room_alias)
try:
yield self.send_room_alias_update_event(
requester,
room_id
)
if send_event:
yield self.send_room_alias_update_event(
requester,
room_id
)
yield self._update_canonical_alias(
requester,

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@ -136,10 +136,15 @@ class RoomCreationHandler(BaseHandler):
requester, tombstone_event, tombstone_context,
)
# and finally, shut down the PLs in the old room, and update them in the new
# room.
old_room_state = yield tombstone_context.get_current_state_ids(self.store)
# update any aliases
yield self._move_aliases_to_new_room(
requester, old_room_id, new_room_id, old_room_state,
)
# and finally, shut down the PLs in the old room, and update them in the new
# room.
yield self._update_upgraded_room_pls(
requester, old_room_id, new_room_id, old_room_state,
)
@ -245,11 +250,6 @@ class RoomCreationHandler(BaseHandler):
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
creation_content = {
"room_version": new_room_version,
"predecessor": {
@ -295,7 +295,112 @@ class RoomCreationHandler(BaseHandler):
# XXX invites/joins
# XXX 3pid invites
# XXX directory_handler.send_room_alias_update_event
@defer.inlineCallbacks
def _move_aliases_to_new_room(
self, requester, old_room_id, new_room_id, old_room_state,
):
directory_handler = self.hs.get_handlers().directory_handler
aliases = yield self.store.get_aliases_for_room(old_room_id)
# check to see if we have a canonical alias.
canonical_alias = None
canonical_alias_event_id = old_room_state.get((EventTypes.CanonicalAlias, ""))
if canonical_alias_event_id:
canonical_alias_event = yield self.store.get_event(canonical_alias_event_id)
if canonical_alias_event:
canonical_alias = canonical_alias_event.content.get("alias", "")
# 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:
yield directory_handler.delete_association(
requester, alias, send_event=False,
)
except SynapseError as e:
logger.warning(
"Unable to remove alias %s from old room: %s",
alias, e,
)
else:
removed_aliases.append(alias_str)
# if we didn't find any aliases, or couldn't remove anyway, we can skip the rest
# of this.
if not removed_aliases:
return
try:
# this can fail if, for some reason, our user doesn't have perms to send
# m.room.aliases events in the old room (note that we've already checked that
# they have perms to send a tombstone event, so that's not terribly likely).
#
# If that happens, it's regrettable, but we should carry on: it's the same
# as when you remove an alias from the directory normally - it just means that
# the aliases event gets out of sync with the directory
# (cf https://github.com/vector-im/riot-web/issues/2369)
yield directory_handler.send_room_alias_update_event(
requester, old_room_id,
)
except AuthError as e:
logger.warning(
"Failed to send updated alias event on old room: %s", e,
)
# we can now add any aliases we successfully removed to the new room.
for alias in removed_aliases:
try:
yield directory_handler.create_association(
requester, RoomAlias.from_string(alias),
new_room_id, servers=(self.hs.hostname, ),
send_event=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,
)
try:
if canonical_alias and (canonical_alias in removed_aliases):
yield 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": {"alias": canonical_alias, },
},
ratelimit=False
)
yield directory_handler.send_room_alias_update_event(
requester, new_room_id,
)
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 new room: %s", e,
)
@defer.inlineCallbacks
def create_room(self, requester, config, ratelimit=True,