488 lines
17 KiB
Python
488 lines
17 KiB
Python
# -*- coding: utf-8 -*-
|
||
# Copyright 2014 - 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 logging
|
||
from collections import namedtuple
|
||
from typing import Any, Dict, Optional
|
||
|
||
import msgpack
|
||
from unpaddedbase64 import decode_base64, encode_base64
|
||
|
||
from synapse.api.constants import EventTypes, JoinRules
|
||
from synapse.api.errors import Codes, HttpResponseException
|
||
from synapse.types import ThirdPartyInstanceID
|
||
from synapse.util.caches.descriptors import cached
|
||
from synapse.util.caches.response_cache import ResponseCache
|
||
|
||
from ._base import BaseHandler
|
||
|
||
logger = logging.getLogger(__name__)
|
||
|
||
REMOTE_ROOM_LIST_POLL_INTERVAL = 60 * 1000
|
||
|
||
# This is used to indicate we should only return rooms published to the main list.
|
||
EMPTY_THIRD_PARTY_ID = ThirdPartyInstanceID(None, None)
|
||
|
||
|
||
class RoomListHandler(BaseHandler):
|
||
def __init__(self, hs):
|
||
super(RoomListHandler, self).__init__(hs)
|
||
self.enable_room_list_search = hs.config.enable_room_list_search
|
||
self.response_cache = ResponseCache(hs, "room_list")
|
||
self.remote_response_cache = ResponseCache(
|
||
hs, "remote_room_list", timeout_ms=30 * 1000
|
||
)
|
||
|
||
async def get_local_public_room_list(
|
||
self,
|
||
limit=None,
|
||
since_token=None,
|
||
search_filter=None,
|
||
network_tuple=EMPTY_THIRD_PARTY_ID,
|
||
from_federation=False,
|
||
):
|
||
"""Generate a local public room list.
|
||
|
||
There are multiple different lists: the main one plus one per third
|
||
party network. A client can ask for a specific list or to return all.
|
||
|
||
Args:
|
||
limit (int|None)
|
||
since_token (str|None)
|
||
search_filter (dict|None)
|
||
network_tuple (ThirdPartyInstanceID): Which public list to use.
|
||
This can be (None, None) to indicate the main list, or a particular
|
||
appservice and network id to use an appservice specific one.
|
||
Setting to None returns all public rooms across all lists.
|
||
from_federation (bool): true iff the request comes from the federation
|
||
API
|
||
"""
|
||
if not self.enable_room_list_search:
|
||
return {"chunk": [], "total_room_count_estimate": 0}
|
||
|
||
logger.info(
|
||
"Getting public room list: limit=%r, since=%r, search=%r, network=%r",
|
||
limit,
|
||
since_token,
|
||
bool(search_filter),
|
||
network_tuple,
|
||
)
|
||
|
||
if search_filter:
|
||
# We explicitly don't bother caching searches or requests for
|
||
# appservice specific lists.
|
||
logger.info("Bypassing cache as search request.")
|
||
|
||
return await self._get_public_room_list(
|
||
limit,
|
||
since_token,
|
||
search_filter,
|
||
network_tuple=network_tuple,
|
||
from_federation=from_federation,
|
||
)
|
||
|
||
key = (limit, since_token, network_tuple)
|
||
return await self.response_cache.wrap(
|
||
key,
|
||
self._get_public_room_list,
|
||
limit,
|
||
since_token,
|
||
network_tuple=network_tuple,
|
||
from_federation=from_federation,
|
||
)
|
||
|
||
async def _get_public_room_list(
|
||
self,
|
||
limit: Optional[int] = None,
|
||
since_token: Optional[str] = None,
|
||
search_filter: Optional[Dict] = None,
|
||
network_tuple: ThirdPartyInstanceID = EMPTY_THIRD_PARTY_ID,
|
||
from_federation: bool = False,
|
||
) -> Dict[str, Any]:
|
||
"""Generate a public room list.
|
||
Args:
|
||
limit: Maximum amount of rooms to return.
|
||
since_token:
|
||
search_filter: Dictionary to filter rooms by.
|
||
network_tuple: Which public list to use.
|
||
This can be (None, None) to indicate the main list, or a particular
|
||
appservice and network id to use an appservice specific one.
|
||
Setting to None returns all public rooms across all lists.
|
||
from_federation: Whether this request originated from a
|
||
federating server or a client. Used for room filtering.
|
||
"""
|
||
|
||
# Pagination tokens work by storing the room ID sent in the last batch,
|
||
# plus the direction (forwards or backwards). Next batch tokens always
|
||
# go forwards, prev batch tokens always go backwards.
|
||
|
||
if since_token:
|
||
batch_token = RoomListNextBatch.from_token(since_token)
|
||
|
||
bounds = (batch_token.last_joined_members, batch_token.last_room_id)
|
||
forwards = batch_token.direction_is_forward
|
||
else:
|
||
batch_token = None
|
||
bounds = None
|
||
|
||
forwards = True
|
||
|
||
# we request one more than wanted to see if there are more pages to come
|
||
probing_limit = limit + 1 if limit is not None else None
|
||
|
||
results = await self.store.get_largest_public_rooms(
|
||
network_tuple,
|
||
search_filter,
|
||
probing_limit,
|
||
bounds=bounds,
|
||
forwards=forwards,
|
||
ignore_non_federatable=from_federation,
|
||
)
|
||
|
||
def build_room_entry(room):
|
||
entry = {
|
||
"room_id": room["room_id"],
|
||
"name": room["name"],
|
||
"topic": room["topic"],
|
||
"canonical_alias": room["canonical_alias"],
|
||
"num_joined_members": room["joined_members"],
|
||
"avatar_url": room["avatar"],
|
||
"world_readable": room["history_visibility"] == "world_readable",
|
||
"guest_can_join": room["guest_access"] == "can_join",
|
||
}
|
||
|
||
# Filter out Nones – rather omit the field altogether
|
||
return {k: v for k, v in entry.items() if v is not None}
|
||
|
||
results = [build_room_entry(r) for r in results]
|
||
|
||
response = {}
|
||
num_results = len(results)
|
||
if limit is not None:
|
||
more_to_come = num_results == probing_limit
|
||
|
||
# Depending on direction we trim either the front or back.
|
||
if forwards:
|
||
results = results[:limit]
|
||
else:
|
||
results = results[-limit:]
|
||
else:
|
||
more_to_come = False
|
||
|
||
if num_results > 0:
|
||
final_entry = results[-1]
|
||
initial_entry = results[0]
|
||
|
||
if forwards:
|
||
if batch_token:
|
||
# If there was a token given then we assume that there
|
||
# must be previous results.
|
||
response["prev_batch"] = RoomListNextBatch(
|
||
last_joined_members=initial_entry["num_joined_members"],
|
||
last_room_id=initial_entry["room_id"],
|
||
direction_is_forward=False,
|
||
).to_token()
|
||
|
||
if more_to_come:
|
||
response["next_batch"] = RoomListNextBatch(
|
||
last_joined_members=final_entry["num_joined_members"],
|
||
last_room_id=final_entry["room_id"],
|
||
direction_is_forward=True,
|
||
).to_token()
|
||
else:
|
||
if batch_token:
|
||
response["next_batch"] = RoomListNextBatch(
|
||
last_joined_members=final_entry["num_joined_members"],
|
||
last_room_id=final_entry["room_id"],
|
||
direction_is_forward=True,
|
||
).to_token()
|
||
|
||
if more_to_come:
|
||
response["prev_batch"] = RoomListNextBatch(
|
||
last_joined_members=initial_entry["num_joined_members"],
|
||
last_room_id=initial_entry["room_id"],
|
||
direction_is_forward=False,
|
||
).to_token()
|
||
|
||
response["chunk"] = results
|
||
|
||
response["total_room_count_estimate"] = await self.store.count_public_rooms(
|
||
network_tuple, ignore_non_federatable=from_federation
|
||
)
|
||
|
||
return response
|
||
|
||
@cached(num_args=1, cache_context=True)
|
||
async def generate_room_entry(
|
||
self,
|
||
room_id: str,
|
||
num_joined_users: int,
|
||
cache_context,
|
||
with_alias: bool = True,
|
||
allow_private: bool = False,
|
||
) -> Optional[dict]:
|
||
"""Returns the entry for a room
|
||
|
||
Args:
|
||
room_id: The room's ID.
|
||
num_joined_users: Number of users in the room.
|
||
cache_context: Information for cached responses.
|
||
with_alias: Whether to return the room's aliases in the result.
|
||
allow_private: Whether invite-only rooms should be shown.
|
||
|
||
Returns:
|
||
Returns a room entry as a dictionary, or None if this
|
||
room was determined not to be shown publicly.
|
||
"""
|
||
result = {"room_id": room_id, "num_joined_members": num_joined_users}
|
||
|
||
if with_alias:
|
||
aliases = await self.store.get_aliases_for_room(
|
||
room_id, on_invalidate=cache_context.invalidate
|
||
)
|
||
if aliases:
|
||
result["aliases"] = aliases
|
||
|
||
current_state_ids = await self.store.get_current_state_ids(
|
||
room_id, on_invalidate=cache_context.invalidate
|
||
)
|
||
|
||
if not current_state_ids:
|
||
# We're not in the room, so may as well bail out here.
|
||
return result
|
||
|
||
event_map = await self.store.get_events(
|
||
[
|
||
event_id
|
||
for key, event_id in current_state_ids.items()
|
||
if key[0]
|
||
in (
|
||
EventTypes.Create,
|
||
EventTypes.JoinRules,
|
||
EventTypes.Name,
|
||
EventTypes.Topic,
|
||
EventTypes.CanonicalAlias,
|
||
EventTypes.RoomHistoryVisibility,
|
||
EventTypes.GuestAccess,
|
||
"m.room.avatar",
|
||
)
|
||
]
|
||
)
|
||
|
||
current_state = {(ev.type, ev.state_key): ev for ev in event_map.values()}
|
||
|
||
# Double check that this is actually a public room.
|
||
|
||
join_rules_event = current_state.get((EventTypes.JoinRules, ""))
|
||
if join_rules_event:
|
||
join_rule = join_rules_event.content.get("join_rule", None)
|
||
if not allow_private and join_rule and join_rule != JoinRules.PUBLIC:
|
||
return None
|
||
|
||
# Return whether this room is open to federation users or not
|
||
create_event = current_state.get((EventTypes.Create, ""))
|
||
result["m.federate"] = create_event.content.get("m.federate", True)
|
||
|
||
name_event = current_state.get((EventTypes.Name, ""))
|
||
if name_event:
|
||
name = name_event.content.get("name", None)
|
||
if name:
|
||
result["name"] = name
|
||
|
||
topic_event = current_state.get((EventTypes.Topic, ""))
|
||
if topic_event:
|
||
topic = topic_event.content.get("topic", None)
|
||
if topic:
|
||
result["topic"] = topic
|
||
|
||
canonical_event = current_state.get((EventTypes.CanonicalAlias, ""))
|
||
if canonical_event:
|
||
canonical_alias = canonical_event.content.get("alias", None)
|
||
if canonical_alias:
|
||
result["canonical_alias"] = canonical_alias
|
||
|
||
visibility_event = current_state.get((EventTypes.RoomHistoryVisibility, ""))
|
||
visibility = None
|
||
if visibility_event:
|
||
visibility = visibility_event.content.get("history_visibility", None)
|
||
result["world_readable"] = visibility == "world_readable"
|
||
|
||
guest_event = current_state.get((EventTypes.GuestAccess, ""))
|
||
guest = None
|
||
if guest_event:
|
||
guest = guest_event.content.get("guest_access", None)
|
||
result["guest_can_join"] = guest == "can_join"
|
||
|
||
avatar_event = current_state.get(("m.room.avatar", ""))
|
||
if avatar_event:
|
||
avatar_url = avatar_event.content.get("url", None)
|
||
if avatar_url:
|
||
result["avatar_url"] = avatar_url
|
||
|
||
return result
|
||
|
||
async def get_remote_public_room_list(
|
||
self,
|
||
server_name,
|
||
limit=None,
|
||
since_token=None,
|
||
search_filter=None,
|
||
include_all_networks=False,
|
||
third_party_instance_id=None,
|
||
):
|
||
if not self.enable_room_list_search:
|
||
return {"chunk": [], "total_room_count_estimate": 0}
|
||
|
||
if search_filter:
|
||
# Searching across federation is defined in MSC2197.
|
||
# However, the remote homeserver may or may not actually support it.
|
||
# So we first try an MSC2197 remote-filtered search, then fall back
|
||
# to a locally-filtered search if we must.
|
||
|
||
try:
|
||
res = await self._get_remote_list_cached(
|
||
server_name,
|
||
limit=limit,
|
||
since_token=since_token,
|
||
include_all_networks=include_all_networks,
|
||
third_party_instance_id=third_party_instance_id,
|
||
search_filter=search_filter,
|
||
)
|
||
return res
|
||
except HttpResponseException as hre:
|
||
syn_err = hre.to_synapse_error()
|
||
if hre.code in (404, 405) or syn_err.errcode in (
|
||
Codes.UNRECOGNIZED,
|
||
Codes.NOT_FOUND,
|
||
):
|
||
logger.debug("Falling back to locally-filtered /publicRooms")
|
||
else:
|
||
raise # Not an error that should trigger a fallback.
|
||
|
||
# if we reach this point, then we fall back to the situation where
|
||
# we currently don't support searching across federation, so we have
|
||
# to do it manually without pagination
|
||
limit = None
|
||
since_token = None
|
||
|
||
res = await self._get_remote_list_cached(
|
||
server_name,
|
||
limit=limit,
|
||
since_token=since_token,
|
||
include_all_networks=include_all_networks,
|
||
third_party_instance_id=third_party_instance_id,
|
||
)
|
||
|
||
if search_filter:
|
||
res = {
|
||
"chunk": [
|
||
entry
|
||
for entry in list(res.get("chunk", []))
|
||
if _matches_room_entry(entry, search_filter)
|
||
]
|
||
}
|
||
|
||
return res
|
||
|
||
async def _get_remote_list_cached(
|
||
self,
|
||
server_name,
|
||
limit=None,
|
||
since_token=None,
|
||
search_filter=None,
|
||
include_all_networks=False,
|
||
third_party_instance_id=None,
|
||
):
|
||
repl_layer = self.hs.get_federation_client()
|
||
if search_filter:
|
||
# We can't cache when asking for search
|
||
return await repl_layer.get_public_rooms(
|
||
server_name,
|
||
limit=limit,
|
||
since_token=since_token,
|
||
search_filter=search_filter,
|
||
include_all_networks=include_all_networks,
|
||
third_party_instance_id=third_party_instance_id,
|
||
)
|
||
|
||
key = (
|
||
server_name,
|
||
limit,
|
||
since_token,
|
||
include_all_networks,
|
||
third_party_instance_id,
|
||
)
|
||
return await self.remote_response_cache.wrap(
|
||
key,
|
||
repl_layer.get_public_rooms,
|
||
server_name,
|
||
limit=limit,
|
||
since_token=since_token,
|
||
search_filter=search_filter,
|
||
include_all_networks=include_all_networks,
|
||
third_party_instance_id=third_party_instance_id,
|
||
)
|
||
|
||
|
||
class RoomListNextBatch(
|
||
namedtuple(
|
||
"RoomListNextBatch",
|
||
(
|
||
"last_joined_members", # The count to get rooms after/before
|
||
"last_room_id", # The room_id to get rooms after/before
|
||
"direction_is_forward", # Bool if this is a next_batch, false if prev_batch
|
||
),
|
||
)
|
||
):
|
||
KEY_DICT = {
|
||
"last_joined_members": "m",
|
||
"last_room_id": "r",
|
||
"direction_is_forward": "d",
|
||
}
|
||
|
||
REVERSE_KEY_DICT = {v: k for k, v in KEY_DICT.items()}
|
||
|
||
@classmethod
|
||
def from_token(cls, token):
|
||
decoded = msgpack.loads(decode_base64(token), raw=False)
|
||
return RoomListNextBatch(
|
||
**{cls.REVERSE_KEY_DICT[key]: val for key, val in decoded.items()}
|
||
)
|
||
|
||
def to_token(self):
|
||
return encode_base64(
|
||
msgpack.dumps(
|
||
{self.KEY_DICT[key]: val for key, val in self._asdict().items()}
|
||
)
|
||
)
|
||
|
||
def copy_and_replace(self, **kwds):
|
||
return self._replace(**kwds)
|
||
|
||
|
||
def _matches_room_entry(room_entry, search_filter):
|
||
if search_filter and search_filter.get("generic_search_term", None):
|
||
generic_search_term = search_filter["generic_search_term"].upper()
|
||
if generic_search_term in room_entry.get("name", "").upper():
|
||
return True
|
||
elif generic_search_term in room_entry.get("topic", "").upper():
|
||
return True
|
||
elif generic_search_term in room_entry.get("canonical_alias", "").upper():
|
||
return True
|
||
else:
|
||
return True
|
||
|
||
return False
|