# -*- 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 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, StoreError, SynapseError from synapse.types import RoomAlias, RoomID, RoomStreamToken, StreamToken, UserID from synapse.util import stringutils 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() @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() 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" # 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 room_id = None while attempts < 5: try: random_string = stringutils.random_string(18) gen_room_id = RoomID( random_string, self.hs.hostname, ) yield self.store.store_room( room_id=gen_room_id.to_string(), room_creator_user_id=user_id, is_public=is_public ) room_id = gen_room_id.to_string() break except StoreError: attempts += 1 if not room_id: raise StoreError(500, "Couldn't generate a room ID.") if room_alias: directory_handler = self.hs.get_handlers().directory_handler yield directory_handler.create_association( user_id=user_id, room_id=room_id, room_alias=room_alias, servers=[self.hs.hostname], ) 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 room_member_handler = self.hs.get_room_member_handler() yield self._send_events_for_new_room( requester, room_id, room_member_handler, 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 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, user_id, room_id ) defer.returnValue(result) @defer.inlineCallbacks def _send_events_for_new_room( self, creator, # A Requester object. room_id, room_member_handler, preset_config, invite_list, initial_state, creation_content, room_alias, power_level_content_override, creator_join_profile, ): 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) 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, ) yield 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 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, ) 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 types = None filtered_types = None if event_filter and event_filter.lazy_load_members(): members = set(ev.sender for ev in itertools.chain( results["events_before"], (results["event"],), results["events_after"], )) filtered_types = [EventTypes.Member] types = [(EventTypes.Member, member) for member in members] # 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], types, filtered_types=filtered_types, ) 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))