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Diffstat (limited to 'synapse/util/presentable_names.py')
| -rw-r--r-- | synapse/util/presentable_names.py | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/synapse/util/presentable_names.py b/synapse/util/presentable_names.py new file mode 100644 index 0000000000..3efa8a8206 --- /dev/null +++ b/synapse/util/presentable_names.py @@ -0,0 +1,159 @@ +# -*- coding: utf-8 -*- +# Copyright 2016 OpenMarket 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. + +import re + +# intentionally looser than what aliases we allow to be registered since +# other HSes may allow aliases that we would not +ALIAS_RE = re.compile(r"^#.*:.+$") + +ALL_ALONE = "Empty Room" + + +def calculate_room_name(room_state, user_id, fallback_to_members=True): + """ + Works out a user-facing name for the given room as per Matrix + spec recommendations. + Does not yet support internationalisation. + Args: + room_state: Dictionary of the room's state + user_id: The ID of the user to whom the room name is being presented + fallback_to_members: If False, return None instead of generating a name + based on the room's members if the room has no + title or aliases. + + Returns: + (string or None) A human readable name for the room. + """ + # does it have a name? + if ("m.room.name", "") in room_state: + m_room_name = room_state[("m.room.name", "")] + if m_room_name.content and m_room_name.content["name"]: + return m_room_name.content["name"] + + # does it have a canonical alias? + if ("m.room.canonical_alias", "") in room_state: + canon_alias = room_state[("m.room.canonical_alias", "")] + if ( + canon_alias.content and canon_alias.content["alias"] and + _looks_like_an_alias(canon_alias.content["alias"]) + ): + return canon_alias.content["alias"] + + # at this point we're going to need to search the state by all state keys + # for an event type, so rearrange the data structure + room_state_bytype = _state_as_two_level_dict(room_state) + + # right then, any aliases at all? + if "m.room.aliases" in room_state_bytype: + m_room_aliases = room_state_bytype["m.room.aliases"] + if len(m_room_aliases.values()) > 0: + first_alias_event = m_room_aliases.values()[0] + if first_alias_event.content and first_alias_event.content["aliases"]: + the_aliases = first_alias_event.content["aliases"] + if len(the_aliases) > 0 and _looks_like_an_alias(the_aliases[0]): + return the_aliases[0] + + if not fallback_to_members: + return None + + my_member_event = None + if ("m.room.member", user_id) in room_state: + my_member_event = room_state[("m.room.member", user_id)] + + if ( + my_member_event is not None and + my_member_event.content['membership'] == "invite" + ): + if ("m.room.member", my_member_event.sender) in room_state: + inviter_member_event = room_state[("m.room.member", my_member_event.sender)] + return "Invite from %s" % (name_from_member_event(inviter_member_event),) + else: + return "Room Invite" + + # we're going to have to generate a name based on who's in the room, + # so find out who is in the room that isn't the user. + if "m.room.member" in room_state_bytype: + all_members = [ + ev for ev in room_state_bytype["m.room.member"].values() + if ev.content['membership'] == "join" or ev.content['membership'] == "invite" + ] + # Sort the member events oldest-first so the we name people in the + # order the joined (it should at least be deterministic rather than + # dictionary iteration order) + all_members.sort(key=lambda e: e.origin_server_ts) + other_members = [m for m in all_members if m.state_key != user_id] + else: + other_members = [] + all_members = [] + + if len(other_members) == 0: + if len(all_members) == 1: + # self-chat, peeked room with 1 participant, + # or inbound invite, or outbound 3PID invite. + if all_members[0].sender == user_id: + if "m.room.third_party_invite" in room_state_bytype: + third_party_invites = room_state_bytype["m.room.third_party_invite"] + if len(third_party_invites) > 0: + # technically third party invite events are not member + # events, but they are close enough + return "Inviting %s" ( + descriptor_from_member_events(third_party_invites) + ) + else: + return ALL_ALONE + else: + return name_from_member_event(all_members[0]) + else: + return ALL_ALONE + else: + return descriptor_from_member_events(other_members) + + +def descriptor_from_member_events(member_events): + if len(member_events) == 0: + return "nobody" + elif len(member_events) == 1: + return name_from_member_event(member_events[0]) + elif len(member_events) == 2: + return "%s and %s" % ( + name_from_member_event(member_events[0]), + name_from_member_event(member_events[1]), + ) + else: + return "%s and %d others" % ( + name_from_member_event(member_events[0]), + len(member_events) - 1, + ) + + +def name_from_member_event(member_event): + if ( + member_event.content and "displayname" in member_event.content and + member_event.content["displayname"] + ): + return member_event.content["displayname"] + return member_event.state_key + + +def _state_as_two_level_dict(state): + ret = {} + for k, v in state.items(): + ret.setdefault(k[0], {})[k[1]] = v + return ret + + +def _looks_like_an_alias(string): + return ALIAS_RE.match(string) is not None |