526 lines
19 KiB
Python
526 lines
19 KiB
Python
# Copyright 2014 - 2016 OpenMarket Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import logging
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from collections import namedtuple
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from typing import TYPE_CHECKING, Any, Optional, Tuple
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import msgpack
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from unpaddedbase64 import decode_base64, encode_base64
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from synapse.api.constants import (
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EventContentFields,
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EventTypes,
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GuestAccess,
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HistoryVisibility,
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JoinRules,
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)
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from synapse.api.errors import (
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Codes,
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HttpResponseException,
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RequestSendFailed,
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SynapseError,
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)
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from synapse.types import JsonDict, ThirdPartyInstanceID
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from synapse.util.caches.descriptors import _CacheContext, cached
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from synapse.util.caches.response_cache import ResponseCache
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if TYPE_CHECKING:
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from synapse.server import HomeServer
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logger = logging.getLogger(__name__)
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REMOTE_ROOM_LIST_POLL_INTERVAL = 60 * 1000
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# This is used to indicate we should only return rooms published to the main list.
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EMPTY_THIRD_PARTY_ID = ThirdPartyInstanceID(None, None)
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class RoomListHandler:
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def __init__(self, hs: "HomeServer"):
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self.store = hs.get_datastore()
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self.hs = hs
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self.enable_room_list_search = hs.config.roomdirectory.enable_room_list_search
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self.response_cache: ResponseCache[
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Tuple[Optional[int], Optional[str], Optional[ThirdPartyInstanceID]]
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] = ResponseCache(hs.get_clock(), "room_list")
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self.remote_response_cache: ResponseCache[
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Tuple[str, Optional[int], Optional[str], bool, Optional[str]]
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] = ResponseCache(hs.get_clock(), "remote_room_list", timeout_ms=30 * 1000)
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async def get_local_public_room_list(
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self,
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limit: Optional[int] = None,
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since_token: Optional[str] = None,
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search_filter: Optional[dict] = None,
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network_tuple: Optional[ThirdPartyInstanceID] = EMPTY_THIRD_PARTY_ID,
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from_federation: bool = False,
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) -> JsonDict:
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"""Generate a local public room list.
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There are multiple different lists: the main one plus one per third
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party network. A client can ask for a specific list or to return all.
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Args:
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limit
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since_token
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search_filter
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network_tuple: Which public list to use.
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This can be (None, None) to indicate the main list, or a particular
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appservice and network id to use an appservice specific one.
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Setting to None returns all public rooms across all lists.
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from_federation: true iff the request comes from the federation API
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"""
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if not self.enable_room_list_search:
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return {"chunk": [], "total_room_count_estimate": 0}
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logger.info(
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"Getting public room list: limit=%r, since=%r, search=%r, network=%r",
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limit,
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since_token,
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bool(search_filter),
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network_tuple,
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)
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if search_filter:
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# We explicitly don't bother caching searches or requests for
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# appservice specific lists.
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logger.info("Bypassing cache as search request.")
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return await self._get_public_room_list(
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limit,
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since_token,
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search_filter,
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network_tuple=network_tuple,
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from_federation=from_federation,
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)
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key = (limit, since_token, network_tuple)
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return await self.response_cache.wrap(
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key,
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self._get_public_room_list,
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limit,
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since_token,
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network_tuple=network_tuple,
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from_federation=from_federation,
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)
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async def _get_public_room_list(
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self,
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limit: Optional[int] = None,
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since_token: Optional[str] = None,
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search_filter: Optional[dict] = None,
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network_tuple: Optional[ThirdPartyInstanceID] = EMPTY_THIRD_PARTY_ID,
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from_federation: bool = False,
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) -> JsonDict:
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"""Generate a public room list.
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Args:
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limit: Maximum amount of rooms to return.
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since_token:
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search_filter: Dictionary to filter rooms by.
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network_tuple: Which public list to use.
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This can be (None, None) to indicate the main list, or a particular
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appservice and network id to use an appservice specific one.
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Setting to None returns all public rooms across all lists.
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from_federation: Whether this request originated from a
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federating server or a client. Used for room filtering.
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"""
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# Pagination tokens work by storing the room ID sent in the last batch,
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# plus the direction (forwards or backwards). Next batch tokens always
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# go forwards, prev batch tokens always go backwards.
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if since_token:
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batch_token = RoomListNextBatch.from_token(since_token)
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bounds: Optional[Tuple[int, str]] = (
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batch_token.last_joined_members,
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batch_token.last_room_id,
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)
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forwards = batch_token.direction_is_forward
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has_batch_token = True
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else:
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bounds = None
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forwards = True
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has_batch_token = False
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# we request one more than wanted to see if there are more pages to come
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probing_limit = limit + 1 if limit is not None else None
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results = await self.store.get_largest_public_rooms(
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network_tuple,
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search_filter,
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probing_limit,
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bounds=bounds,
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forwards=forwards,
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ignore_non_federatable=from_federation,
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)
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def build_room_entry(room: JsonDict) -> JsonDict:
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entry = {
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"room_id": room["room_id"],
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"name": room["name"],
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"topic": room["topic"],
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"canonical_alias": room["canonical_alias"],
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"num_joined_members": room["joined_members"],
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"avatar_url": room["avatar"],
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"world_readable": room["history_visibility"]
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== HistoryVisibility.WORLD_READABLE,
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"guest_can_join": room["guest_access"] == "can_join",
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"join_rule": room["join_rules"],
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}
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# Filter out Nones – rather omit the field altogether
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return {k: v for k, v in entry.items() if v is not None}
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results = [build_room_entry(r) for r in results]
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response: JsonDict = {}
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num_results = len(results)
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if limit is not None:
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more_to_come = num_results == probing_limit
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# Depending on direction we trim either the front or back.
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if forwards:
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results = results[:limit]
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else:
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results = results[-limit:]
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else:
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more_to_come = False
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if num_results > 0:
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final_entry = results[-1]
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initial_entry = results[0]
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if forwards:
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if has_batch_token:
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# If there was a token given then we assume that there
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# must be previous results.
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response["prev_batch"] = RoomListNextBatch(
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last_joined_members=initial_entry["num_joined_members"],
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last_room_id=initial_entry["room_id"],
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direction_is_forward=False,
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).to_token()
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if more_to_come:
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response["next_batch"] = RoomListNextBatch(
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last_joined_members=final_entry["num_joined_members"],
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last_room_id=final_entry["room_id"],
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direction_is_forward=True,
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).to_token()
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else:
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if has_batch_token:
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response["next_batch"] = RoomListNextBatch(
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last_joined_members=final_entry["num_joined_members"],
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last_room_id=final_entry["room_id"],
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direction_is_forward=True,
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).to_token()
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if more_to_come:
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response["prev_batch"] = RoomListNextBatch(
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last_joined_members=initial_entry["num_joined_members"],
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last_room_id=initial_entry["room_id"],
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direction_is_forward=False,
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).to_token()
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response["chunk"] = results
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response["total_room_count_estimate"] = await self.store.count_public_rooms(
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network_tuple, ignore_non_federatable=from_federation
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)
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return response
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@cached(num_args=1, cache_context=True)
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async def generate_room_entry(
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self,
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room_id: str,
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num_joined_users: int,
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cache_context: _CacheContext,
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with_alias: bool = True,
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allow_private: bool = False,
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) -> Optional[JsonDict]:
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"""Returns the entry for a room
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Args:
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room_id: The room's ID.
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num_joined_users: Number of users in the room.
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cache_context: Information for cached responses.
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with_alias: Whether to return the room's aliases in the result.
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allow_private: Whether invite-only rooms should be shown.
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Returns:
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Returns a room entry as a dictionary, or None if this
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room was determined not to be shown publicly.
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"""
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result = {"room_id": room_id, "num_joined_members": num_joined_users}
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if with_alias:
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aliases = await self.store.get_aliases_for_room(
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room_id, on_invalidate=cache_context.invalidate
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)
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if aliases:
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result["aliases"] = aliases
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current_state_ids = await self.store.get_current_state_ids(
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room_id, on_invalidate=cache_context.invalidate
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)
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if not current_state_ids:
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# We're not in the room, so may as well bail out here.
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return result
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event_map = await self.store.get_events(
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[
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event_id
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for key, event_id in current_state_ids.items()
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if key[0]
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in (
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EventTypes.Create,
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EventTypes.JoinRules,
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EventTypes.Name,
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EventTypes.Topic,
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EventTypes.CanonicalAlias,
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EventTypes.RoomHistoryVisibility,
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EventTypes.GuestAccess,
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"m.room.avatar",
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)
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]
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)
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current_state = {(ev.type, ev.state_key): ev for ev in event_map.values()}
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# Double check that this is actually a public room.
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join_rules_event = current_state.get((EventTypes.JoinRules, ""))
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if join_rules_event:
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join_rule = join_rules_event.content.get("join_rule", None)
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if not allow_private and join_rule and join_rule != JoinRules.PUBLIC:
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return None
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# Return whether this room is open to federation users or not
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create_event = current_state[EventTypes.Create, ""]
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result["m.federate"] = create_event.content.get(
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EventContentFields.FEDERATE, True
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)
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name_event = current_state.get((EventTypes.Name, ""))
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if name_event:
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name = name_event.content.get("name", None)
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if name:
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result["name"] = name
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topic_event = current_state.get((EventTypes.Topic, ""))
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if topic_event:
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topic = topic_event.content.get("topic", None)
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if topic:
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result["topic"] = topic
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canonical_event = current_state.get((EventTypes.CanonicalAlias, ""))
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if canonical_event:
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canonical_alias = canonical_event.content.get("alias", None)
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if canonical_alias:
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result["canonical_alias"] = canonical_alias
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visibility_event = current_state.get((EventTypes.RoomHistoryVisibility, ""))
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visibility = None
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if visibility_event:
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visibility = visibility_event.content.get("history_visibility", None)
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result["world_readable"] = visibility == HistoryVisibility.WORLD_READABLE
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guest_event = current_state.get((EventTypes.GuestAccess, ""))
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guest = None
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if guest_event:
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guest = guest_event.content.get(EventContentFields.GUEST_ACCESS)
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result["guest_can_join"] = guest == GuestAccess.CAN_JOIN
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avatar_event = current_state.get(("m.room.avatar", ""))
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if avatar_event:
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avatar_url = avatar_event.content.get("url", None)
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if avatar_url:
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result["avatar_url"] = avatar_url
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return result
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async def get_remote_public_room_list(
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self,
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server_name: str,
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limit: Optional[int] = None,
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since_token: Optional[str] = None,
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search_filter: Optional[dict] = None,
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include_all_networks: bool = False,
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third_party_instance_id: Optional[str] = None,
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) -> JsonDict:
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"""Get the public room list from remote server
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Raises:
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SynapseError
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"""
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if not self.enable_room_list_search:
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return {"chunk": [], "total_room_count_estimate": 0}
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if search_filter:
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# Searching across federation is defined in MSC2197.
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# However, the remote homeserver may or may not actually support it.
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# So we first try an MSC2197 remote-filtered search, then fall back
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# to a locally-filtered search if we must.
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try:
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res = await self._get_remote_list_cached(
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server_name,
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limit=limit,
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since_token=since_token,
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include_all_networks=include_all_networks,
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third_party_instance_id=third_party_instance_id,
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search_filter=search_filter,
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)
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return res
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except HttpResponseException as hre:
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syn_err = hre.to_synapse_error()
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if hre.code in (404, 405) or syn_err.errcode in (
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Codes.UNRECOGNIZED,
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Codes.NOT_FOUND,
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):
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logger.debug("Falling back to locally-filtered /publicRooms")
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else:
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# Not an error that should trigger a fallback.
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raise SynapseError(502, "Failed to fetch room list")
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except RequestSendFailed:
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# Not an error that should trigger a fallback.
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raise SynapseError(502, "Failed to fetch room list")
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# if we reach this point, then we fall back to the situation where
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# we currently don't support searching across federation, so we have
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# to do it manually without pagination
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limit = None
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since_token = None
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try:
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res = await self._get_remote_list_cached(
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server_name,
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limit=limit,
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since_token=since_token,
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include_all_networks=include_all_networks,
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third_party_instance_id=third_party_instance_id,
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)
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except (RequestSendFailed, HttpResponseException):
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raise SynapseError(502, "Failed to fetch room list")
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if search_filter:
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res = {
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"chunk": [
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entry
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for entry in list(res.get("chunk", []))
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if _matches_room_entry(entry, search_filter)
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]
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}
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return res
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async def _get_remote_list_cached(
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self,
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server_name: str,
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limit: Optional[int] = None,
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since_token: Optional[str] = None,
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search_filter: Optional[dict] = None,
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include_all_networks: bool = False,
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third_party_instance_id: Optional[str] = None,
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) -> JsonDict:
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"""Wrapper around FederationClient.get_public_rooms that caches the
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result.
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"""
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repl_layer = self.hs.get_federation_client()
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if search_filter:
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# We can't cache when asking for search
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return await repl_layer.get_public_rooms(
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server_name,
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limit=limit,
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since_token=since_token,
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search_filter=search_filter,
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include_all_networks=include_all_networks,
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third_party_instance_id=third_party_instance_id,
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)
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key = (
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server_name,
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limit,
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since_token,
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include_all_networks,
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third_party_instance_id,
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)
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return await self.remote_response_cache.wrap(
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key,
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repl_layer.get_public_rooms,
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server_name,
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limit=limit,
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since_token=since_token,
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search_filter=search_filter,
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include_all_networks=include_all_networks,
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third_party_instance_id=third_party_instance_id,
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)
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class RoomListNextBatch(
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namedtuple(
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"RoomListNextBatch",
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(
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"last_joined_members", # The count to get rooms after/before
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"last_room_id", # The room_id to get rooms after/before
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"direction_is_forward", # Bool if this is a next_batch, false if prev_batch
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),
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)
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):
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KEY_DICT = {
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"last_joined_members": "m",
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"last_room_id": "r",
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"direction_is_forward": "d",
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}
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REVERSE_KEY_DICT = {v: k for k, v in KEY_DICT.items()}
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@classmethod
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def from_token(cls, token: str) -> "RoomListNextBatch":
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decoded = msgpack.loads(decode_base64(token), raw=False)
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return RoomListNextBatch(
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**{cls.REVERSE_KEY_DICT[key]: val for key, val in decoded.items()}
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)
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def to_token(self) -> str:
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return encode_base64(
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msgpack.dumps(
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{self.KEY_DICT[key]: val for key, val in self._asdict().items()}
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)
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)
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def copy_and_replace(self, **kwds: Any) -> "RoomListNextBatch":
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return self._replace(**kwds)
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def _matches_room_entry(room_entry: JsonDict, search_filter: dict) -> bool:
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if search_filter and search_filter.get("generic_search_term", None):
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generic_search_term = search_filter["generic_search_term"].upper()
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if generic_search_term in room_entry.get("name", "").upper():
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return True
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elif generic_search_term in room_entry.get("topic", "").upper():
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return True
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elif generic_search_term in room_entry.get("canonical_alias", "").upper():
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return True
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else:
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return True
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return False
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