# -*- coding: utf-8 -*- # Copyright 2014 - 2016 OpenMarket Ltd # Copyright 2018 New Vector Ltd # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. """Contains functions for performing events on rooms.""" import itertools import logging import math import string from collections import OrderedDict from six import iteritems, string_types from twisted.internet import defer from synapse.api.constants import ( DEFAULT_ROOM_VERSION, KNOWN_ROOM_VERSIONS, EventTypes, JoinRules, RoomCreationPreset, ) from synapse.api.errors import AuthError, Codes, NotFoundError, 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 logger = logging.getLogger(__name__) id_server_scheme = "https://" class RoomCreationHandler(BaseHandler): PRESETS_DICT = { RoomCreationPreset.PRIVATE_CHAT: { "join_rules": JoinRules.INVITE, "history_visibility": "shared", "original_invitees_have_ops": False, "guest_can_join": True, }, RoomCreationPreset.TRUSTED_PRIVATE_CHAT: { "join_rules": JoinRules.INVITE, "history_visibility": "shared", "original_invitees_have_ops": True, "guest_can_join": True, }, RoomCreationPreset.PUBLIC_CHAT: { "join_rules": JoinRules.PUBLIC, "history_visibility": "shared", "original_invitees_have_ops": False, "guest_can_join": False, }, } def __init__(self, hs): super(RoomCreationHandler, self).__init__(hs) self.spam_checker = hs.get_spam_checker() 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 r = yield self.store.get_room(old_room_id) if r is None: raise NotFoundError("Unknown room id %s" % (old_room_id,)) new_room_id = yield self._generate_room_id( creator_id=user_id, is_public=r["is_public"], ) logger.info("Creating new room %s to replace %s", new_room_id, old_room_id) # 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, ) ) old_room_version = yield self.store.get_room_version(old_room_id) yield self.auth.check_from_context( old_room_version, 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, ) 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, ) defer.returnValue(new_room_id) @defer.inlineCallbacks def _update_upgraded_room_pls( self, requester, old_room_id, new_room_id, old_room_state, ): """Send updated power levels in both rooms after an upgrade 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 of the replacement room old_room_state (dict[tuple[str, str], str]): the state map for the old room Returns: Deferred """ old_room_pl_event_id = old_room_state.get((EventTypes.PowerLevels, "")) if old_room_pl_event_id is None: logger.warning( "Not supported: upgrading a room with no PL event. Not setting PLs " "in old room.", ) return old_room_pl_state = yield self.store.get_event(old_room_pl_event_id) # we try to stop regular users from speaking by setting the PL required # to send regular events and invites to 'Moderator' level. That's normally # 50, but if the default PL in a room is 50 or more, then we set the # required PL above that. pl_content = dict(old_room_pl_state.content) users_default = int(pl_content.get("users_default", 0)) restricted_level = max(users_default + 1, 50) updated = False for v in ("invite", "events_default"): current = int(pl_content.get(v, 0)) if current < restricted_level: logger.info( "Setting level for %s in %s to %i (was %i)", v, old_room_id, restricted_level, current, ) pl_content[v] = restricted_level updated = True else: logger.info( "Not setting level for %s (already %i)", v, current, ) if updated: try: yield self.event_creation_handler.create_and_send_nonmember_event( requester, { "type": EventTypes.PowerLevels, "state_key": '', "room_id": old_room_id, "sender": requester.user.to_string(), "content": pl_content, }, ratelimit=False, ) except AuthError as e: logger.warning("Unable to update PLs in old room: %s", e) logger.info("Setting correct PLs in new room") yield self.event_creation_handler.create_and_send_nonmember_event( requester, { "type": EventTypes.PowerLevels, "state_key": '', "room_id": new_room_id, "sender": requester.user.to_string(), "content": old_room_pl_state.content, }, ratelimit=False, ) @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") creation_content = { "room_version": new_room_version, "predecessor": { "room_id": old_room_id, "event_id": tombstone_event_id, } } initial_state = dict() types_to_copy = ( (EventTypes.JoinRules, ""), (EventTypes.Name, ""), (EventTypes.Topic, ""), (EventTypes.RoomHistoryVisibility, ""), (EventTypes.GuestAccess, ""), (EventTypes.RoomAvatar, ""), (EventTypes.Encryption, ""), ) old_room_state_ids = yield self.store.get_filtered_current_state_ids( old_room_id, StateFilter.from_types(types_to_copy), ) # map from event_id to BaseEvent old_room_state_events = yield self.store.get_events(old_room_state_ids.values()) for k, old_event_id in iteritems(old_room_state_ids): old_event = old_room_state_events.get(old_event_id) if old_event: initial_state[k] = old_event.content yield self._send_events_for_new_room( requester, new_room_id, # we expect to override all the presets with initial_state, so this is # somewhat arbitrary. preset_config=RoomCreationPreset.PRIVATE_CHAT, invite_list=[], initial_state=initial_state, creation_content=creation_content, ) # XXX invites/joins # XXX 3pid invites @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, ) removed_aliases.append(alias_str) except SynapseError as e: logger.warning( "Unable to remove alias %s from old room: %s", alias, e, ) # 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, creator_join_profile=None): """ Creates a new room. Args: requester (synapse.types.Requester): The user who requested the room creation. config (dict) : A dict of configuration options. ratelimit (bool): set to False to disable the rate limiter creator_join_profile (dict|None): Set to override the displayname and avatar for the creating user in this room. If unset, displayname and avatar will be derived from the user's profile. If set, should contain the values to go in the body of the 'join' event (typically `avatar_url` and/or `displayname`. Returns: Deferred[dict]: a dict containing the keys `room_id` and, if an alias was requested, `room_alias`. Raises: SynapseError if the room ID couldn't be stored, or something went horribly wrong. ResourceLimitError if server is blocked to some resource being exceeded """ user_id = requester.user.to_string() yield self.auth.check_auth_blocking(user_id) if not self.spam_checker.user_may_create_room(user_id): raise SynapseError(403, "You are not permitted to create rooms") if ratelimit: yield self.ratelimit(requester) room_version = config.get("room_version", DEFAULT_ROOM_VERSION) if not isinstance(room_version, string_types): raise SynapseError( 400, "room_version must be a string", Codes.BAD_JSON, ) if room_version not in KNOWN_ROOM_VERSIONS: raise SynapseError( 400, "Your homeserver does not support this room version", Codes.UNSUPPORTED_ROOM_VERSION, ) if "room_alias_name" in config: for wchar in string.whitespace: if wchar in config["room_alias_name"]: raise SynapseError(400, "Invalid characters in room alias") room_alias = RoomAlias( config["room_alias_name"], self.hs.hostname, ) mapping = yield self.store.get_association_from_room_alias( room_alias ) if mapping: raise SynapseError( 400, "Room alias already taken", Codes.ROOM_IN_USE ) else: room_alias = None invite_list = config.get("invite", []) for i in invite_list: try: UserID.from_string(i) except Exception: raise SynapseError(400, "Invalid user_id: %s" % (i,)) yield self.event_creation_handler.assert_accepted_privacy_policy( requester, ) invite_3pid_list = config.get("invite_3pid", []) visibility = config.get("visibility", None) is_public = visibility == "public" room_id = yield self._generate_room_id(creator_id=user_id, is_public=is_public) if room_alias: directory_handler = self.hs.get_handlers().directory_handler yield directory_handler.create_association( requester=requester, room_id=room_id, room_alias=room_alias, servers=[self.hs.hostname], send_event=False, ) preset_config = config.get( "preset", RoomCreationPreset.PRIVATE_CHAT if visibility == "private" else RoomCreationPreset.PUBLIC_CHAT ) raw_initial_state = config.get("initial_state", []) initial_state = OrderedDict() for val in raw_initial_state: initial_state[(val["type"], val.get("state_key", ""))] = val["content"] creation_content = config.get("creation_content", {}) # override any attempt to set room versions via the creation_content creation_content["room_version"] = room_version yield self._send_events_for_new_room( requester, room_id, preset_config=preset_config, invite_list=invite_list, initial_state=initial_state, creation_content=creation_content, room_alias=room_alias, power_level_content_override=config.get("power_level_content_override"), creator_join_profile=creator_join_profile, ) if "name" in config: name = config["name"] yield self.event_creation_handler.create_and_send_nonmember_event( requester, { "type": EventTypes.Name, "room_id": room_id, "sender": user_id, "state_key": "", "content": {"name": name}, }, ratelimit=False) if "topic" in config: topic = config["topic"] yield self.event_creation_handler.create_and_send_nonmember_event( requester, { "type": EventTypes.Topic, "room_id": room_id, "sender": user_id, "state_key": "", "content": {"topic": topic}, }, ratelimit=False) for invitee in invite_list: content = {} is_direct = config.get("is_direct", None) if is_direct: content["is_direct"] = is_direct yield self.room_member_handler.update_membership( requester, UserID.from_string(invitee), room_id, "invite", ratelimit=False, content=content, ) for invite_3pid in invite_3pid_list: id_server = invite_3pid["id_server"] address = invite_3pid["address"] medium = invite_3pid["medium"] yield self.hs.get_room_member_handler().do_3pid_invite( room_id, requester.user, medium, address, id_server, requester, txn_id=None, ) result = {"room_id": room_id} if room_alias: result["room_alias"] = room_alias.to_string() yield directory_handler.send_room_alias_update_event( requester, room_id ) defer.returnValue(result) @defer.inlineCallbacks def _send_events_for_new_room( self, creator, # A Requester object. room_id, preset_config, invite_list, initial_state, creation_content, room_alias=None, power_level_content_override=None, creator_join_profile=None, ): def create(etype, content, **kwargs): e = { "type": etype, "content": content, } e.update(event_keys) e.update(kwargs) return e @defer.inlineCallbacks def send(etype, content, **kwargs): event = create(etype, content, **kwargs) logger.info("Sending %s in new room", etype) yield self.event_creation_handler.create_and_send_nonmember_event( creator, event, ratelimit=False ) config = RoomCreationHandler.PRESETS_DICT[preset_config] creator_id = creator.user.to_string() event_keys = { "room_id": room_id, "sender": creator_id, "state_key": "", } creation_content.update({"creator": creator_id}) yield send( etype=EventTypes.Create, content=creation_content, ) logger.info("Sending %s in new room", EventTypes.Member) yield self.room_member_handler.update_membership( creator, creator.user, room_id, "join", ratelimit=False, content=creator_join_profile, ) # We treat the power levels override specially as this needs to be one # of the first events that get sent into a room. pl_content = initial_state.pop((EventTypes.PowerLevels, ''), None) if pl_content is not None: yield send( etype=EventTypes.PowerLevels, content=pl_content, ) else: power_level_content = { "users": { creator_id: 100, }, "users_default": 0, "events": { EventTypes.Name: 50, EventTypes.PowerLevels: 100, EventTypes.RoomHistoryVisibility: 100, EventTypes.CanonicalAlias: 50, EventTypes.RoomAvatar: 50, }, "events_default": 0, "state_default": 50, "ban": 50, "kick": 50, "redact": 50, "invite": 0, } if config["original_invitees_have_ops"]: for invitee in invite_list: power_level_content["users"][invitee] = 100 if power_level_content_override: power_level_content.update(power_level_content_override) yield send( etype=EventTypes.PowerLevels, content=power_level_content, ) if room_alias and (EventTypes.CanonicalAlias, '') not in initial_state: yield send( etype=EventTypes.CanonicalAlias, content={"alias": room_alias.to_string()}, ) if (EventTypes.JoinRules, '') not in initial_state: yield send( etype=EventTypes.JoinRules, content={"join_rule": config["join_rules"]}, ) if (EventTypes.RoomHistoryVisibility, '') not in initial_state: yield send( etype=EventTypes.RoomHistoryVisibility, content={"history_visibility": config["history_visibility"]} ) if config["guest_can_join"]: if (EventTypes.GuestAccess, '') not in initial_state: yield send( etype=EventTypes.GuestAccess, content={"guest_access": "can_join"} ) for (etype, state_key), content in initial_state.items(): yield send( etype=etype, state_key=state_key, content=content, ) @defer.inlineCallbacks def _generate_room_id(self, creator_id, is_public): # autogen room IDs and try to create it. We may clash, so just # try a few times till one goes through, giving up eventually. attempts = 0 while attempts < 5: try: random_string = stringutils.random_string(18) gen_room_id = RoomID( 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, is_public=is_public, ) defer.returnValue(gen_room_id) except StoreError: attempts += 1 raise StoreError(500, "Couldn't generate a room ID.") class RoomContextHandler(object): def __init__(self, hs): self.hs = hs self.store = hs.get_datastore() @defer.inlineCallbacks def get_event_context(self, user, room_id, event_id, limit, event_filter): """Retrieves events, pagination tokens and state around a given event in a room. Args: user (UserID) room_id (str) event_id (str) limit (int): The maximum number of events to return in total (excluding state). event_filter (Filter|None): the filter to apply to the events returned (excluding the target event_id) Returns: dict, or None if the event isn't found """ before_limit = math.floor(limit / 2.) after_limit = limit - before_limit users = yield self.store.get_users_in_room(room_id) is_peeking = user.to_string() not in users def filter_evts(events): return filter_events_for_client( self.store, user.to_string(), events, is_peeking=is_peeking ) event = yield self.store.get_event(event_id, get_prev_content=True, allow_none=True) if not event: defer.returnValue(None) return filtered = yield(filter_evts([event])) if not filtered: raise AuthError( 403, "You don't have permission to access that event." ) results = yield self.store.get_events_around( room_id, event_id, before_limit, after_limit, event_filter ) results["events_before"] = yield filter_evts(results["events_before"]) results["events_after"] = yield filter_evts(results["events_after"]) results["event"] = event if results["events_after"]: last_event_id = results["events_after"][-1].event_id else: last_event_id = event_id if event_filter and event_filter.lazy_load_members(): state_filter = StateFilter.from_lazy_load_member_list( ev.sender for ev in itertools.chain( results["events_before"], (results["event"],), results["events_after"], ) ) else: state_filter = StateFilter.all() # XXX: why do we return the state as of the last event rather than the # first? Shouldn't we be consistent with /sync? # https://github.com/matrix-org/matrix-doc/issues/687 state = yield self.store.get_state_for_events( [last_event_id], state_filter=state_filter, ) results["state"] = list(state[last_event_id].values()) # We use a dummy token here as we only care about the room portion of # the token, which we replace. token = StreamToken.START results["start"] = token.copy_and_replace( "room_key", results["start"] ).to_string() results["end"] = token.copy_and_replace( "room_key", results["end"] ).to_string() defer.returnValue(results) class RoomEventSource(object): def __init__(self, hs): self.store = hs.get_datastore() @defer.inlineCallbacks def get_new_events( self, user, from_key, limit, room_ids, is_guest, explicit_room_id=None, ): # We just ignore the key for now. to_key = yield self.get_current_key() from_token = RoomStreamToken.parse(from_key) if from_token.topological: logger.warn("Stream has topological part!!!! %r", from_key) from_key = "s%s" % (from_token.stream,) app_service = self.store.get_app_service_by_user_id( user.to_string() ) if app_service: # We no longer support AS users using /sync directly. # See https://github.com/matrix-org/matrix-doc/issues/1144 raise NotImplementedError() else: room_events = yield self.store.get_membership_changes_for_user( user.to_string(), from_key, to_key ) room_to_events = yield self.store.get_room_events_stream_for_rooms( room_ids=room_ids, from_key=from_key, to_key=to_key, limit=limit or 10, order='ASC', ) events = list(room_events) events.extend(e for evs, _ in room_to_events.values() for e in evs) events.sort(key=lambda e: e.internal_metadata.order) if limit: events[:] = events[:limit] if events: end_key = events[-1].internal_metadata.after else: end_key = to_key defer.returnValue((events, end_key)) def get_current_key(self): return self.store.get_room_events_max_id() def get_current_key_for_room(self, room_id): return self.store.get_room_events_max_id(room_id) @defer.inlineCallbacks def get_pagination_rows(self, user, config, key): events, next_key = yield self.store.paginate_room_events( room_id=key, from_key=config.from_key, to_key=config.to_key, direction=config.direction, limit=config.limit, ) defer.returnValue((events, next_key))