476 lines
17 KiB
Python
476 lines
17 KiB
Python
# Copyright 2015, 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 itertools
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import logging
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from typing import TYPE_CHECKING, Dict, Iterable, List, Optional
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from unpaddedbase64 import decode_base64, encode_base64
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from synapse.api.constants import EventTypes, Membership
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from synapse.api.errors import NotFoundError, SynapseError
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from synapse.api.filtering import Filter
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from synapse.events import EventBase
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from synapse.storage.state import StateFilter
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from synapse.types import JsonDict, UserID
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from synapse.visibility import filter_events_for_client
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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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class SearchHandler:
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def __init__(self, hs: "HomeServer"):
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self.store = hs.get_datastore()
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self.state_handler = hs.get_state_handler()
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self.clock = hs.get_clock()
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self.hs = hs
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self._event_serializer = hs.get_event_client_serializer()
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self.storage = hs.get_storage()
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self.state_store = self.storage.state
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self.auth = hs.get_auth()
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async def get_old_rooms_from_upgraded_room(self, room_id: str) -> Iterable[str]:
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"""Retrieves room IDs of old rooms in the history of an upgraded room.
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We do so by checking the m.room.create event of the room for a
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`predecessor` key. If it exists, we add the room ID to our return
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list and then check that room for a m.room.create event and so on
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until we can no longer find any more previous rooms.
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The full list of all found rooms in then returned.
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Args:
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room_id: id of the room to search through.
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Returns:
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Predecessor room ids
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"""
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historical_room_ids = []
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# The initial room must have been known for us to get this far
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predecessor = await self.store.get_room_predecessor(room_id)
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while True:
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if not predecessor:
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# We have reached the end of the chain of predecessors
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break
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if not isinstance(predecessor.get("room_id"), str):
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# This predecessor object is malformed. Exit here
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break
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predecessor_room_id = predecessor["room_id"]
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# Don't add it to the list until we have checked that we are in the room
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try:
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next_predecessor_room = await self.store.get_room_predecessor(
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predecessor_room_id
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)
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except NotFoundError:
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# The predecessor is not a known room, so we are done here
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break
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historical_room_ids.append(predecessor_room_id)
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# And repeat
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predecessor = next_predecessor_room
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return historical_room_ids
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async def search(
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self, user: UserID, content: JsonDict, batch: Optional[str] = None
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) -> JsonDict:
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"""Performs a full text search for a user.
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Args:
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user
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content: Search parameters
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batch: The next_batch parameter. Used for pagination.
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Returns:
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dict to be returned to the client with results of search
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"""
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if not self.hs.config.server.enable_search:
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raise SynapseError(400, "Search is disabled on this homeserver")
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batch_group = None
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batch_group_key = None
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batch_token = None
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if batch:
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try:
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b = decode_base64(batch).decode("ascii")
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batch_group, batch_group_key, batch_token = b.split("\n")
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assert batch_group is not None
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assert batch_group_key is not None
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assert batch_token is not None
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except Exception:
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raise SynapseError(400, "Invalid batch")
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logger.info(
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"Search batch properties: %r, %r, %r",
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batch_group,
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batch_group_key,
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batch_token,
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)
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logger.info("Search content: %s", content)
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try:
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room_cat = content["search_categories"]["room_events"]
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# The actual thing to query in FTS
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search_term = room_cat["search_term"]
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# Which "keys" to search over in FTS query
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keys = room_cat.get(
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"keys", ["content.body", "content.name", "content.topic"]
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)
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# Filter to apply to results
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filter_dict = room_cat.get("filter", {})
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# What to order results by (impacts whether pagination can be done)
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order_by = room_cat.get("order_by", "rank")
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# Return the current state of the rooms?
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include_state = room_cat.get("include_state", False)
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# Include context around each event?
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event_context = room_cat.get("event_context", None)
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# Group results together? May allow clients to paginate within a
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# group
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group_by = room_cat.get("groupings", {}).get("group_by", {})
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group_keys = [g["key"] for g in group_by]
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if event_context is not None:
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before_limit = int(event_context.get("before_limit", 5))
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after_limit = int(event_context.get("after_limit", 5))
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# Return the historic display name and avatar for the senders
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# of the events?
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include_profile = bool(event_context.get("include_profile", False))
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except KeyError:
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raise SynapseError(400, "Invalid search query")
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if order_by not in ("rank", "recent"):
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raise SynapseError(400, "Invalid order by: %r" % (order_by,))
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if set(group_keys) - {"room_id", "sender"}:
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raise SynapseError(
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400,
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"Invalid group by keys: %r"
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% (set(group_keys) - {"room_id", "sender"},),
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)
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search_filter = Filter(self.hs, filter_dict)
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# TODO: Search through left rooms too
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rooms = await self.store.get_rooms_for_local_user_where_membership_is(
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user.to_string(),
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membership_list=[Membership.JOIN],
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# membership_list=[Membership.JOIN, Membership.LEAVE, Membership.Ban],
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)
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room_ids = {r.room_id for r in rooms}
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# If doing a subset of all rooms seearch, check if any of the rooms
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# are from an upgraded room, and search their contents as well
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if search_filter.rooms:
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historical_room_ids: List[str] = []
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for room_id in search_filter.rooms:
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# Add any previous rooms to the search if they exist
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ids = await self.get_old_rooms_from_upgraded_room(room_id)
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historical_room_ids += ids
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# Prevent any historical events from being filtered
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search_filter = search_filter.with_room_ids(historical_room_ids)
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room_ids = search_filter.filter_rooms(room_ids)
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if batch_group == "room_id":
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room_ids.intersection_update({batch_group_key})
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if not room_ids:
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return {
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"search_categories": {
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"room_events": {"results": [], "count": 0, "highlights": []}
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}
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}
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rank_map = {} # event_id -> rank of event
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allowed_events = []
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# Holds result of grouping by room, if applicable
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room_groups: Dict[str, JsonDict] = {}
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# Holds result of grouping by sender, if applicable
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sender_group: Dict[str, JsonDict] = {}
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# Holds the next_batch for the entire result set if one of those exists
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global_next_batch = None
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highlights = set()
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count = None
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if order_by == "rank":
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search_result = await self.store.search_msgs(room_ids, search_term, keys)
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count = search_result["count"]
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if search_result["highlights"]:
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highlights.update(search_result["highlights"])
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results = search_result["results"]
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results_map = {r["event"].event_id: r for r in results}
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rank_map.update({r["event"].event_id: r["rank"] for r in results})
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filtered_events = await search_filter.filter([r["event"] for r in results])
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events = await filter_events_for_client(
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self.storage, user.to_string(), filtered_events
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)
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events.sort(key=lambda e: -rank_map[e.event_id])
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allowed_events = events[: search_filter.limit]
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for e in allowed_events:
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rm = room_groups.setdefault(
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e.room_id, {"results": [], "order": rank_map[e.event_id]}
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)
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rm["results"].append(e.event_id)
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s = sender_group.setdefault(
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e.sender, {"results": [], "order": rank_map[e.event_id]}
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)
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s["results"].append(e.event_id)
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elif order_by == "recent":
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room_events: List[EventBase] = []
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i = 0
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pagination_token = batch_token
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# We keep looping and we keep filtering until we reach the limit
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# or we run out of things.
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# But only go around 5 times since otherwise synapse will be sad.
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while len(room_events) < search_filter.limit and i < 5:
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i += 1
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search_result = await self.store.search_rooms(
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room_ids,
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search_term,
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keys,
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search_filter.limit * 2,
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pagination_token=pagination_token,
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)
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if search_result["highlights"]:
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highlights.update(search_result["highlights"])
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count = search_result["count"]
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results = search_result["results"]
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results_map = {r["event"].event_id: r for r in results}
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rank_map.update({r["event"].event_id: r["rank"] for r in results})
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filtered_events = await search_filter.filter(
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[r["event"] for r in results]
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)
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events = await filter_events_for_client(
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self.storage, user.to_string(), filtered_events
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)
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room_events.extend(events)
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room_events = room_events[: search_filter.limit]
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if len(results) < search_filter.limit * 2:
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pagination_token = None
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break
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else:
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pagination_token = results[-1]["pagination_token"]
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for event in room_events:
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group = room_groups.setdefault(event.room_id, {"results": []})
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group["results"].append(event.event_id)
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if room_events and len(room_events) >= search_filter.limit:
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last_event_id = room_events[-1].event_id
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pagination_token = results_map[last_event_id]["pagination_token"]
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# We want to respect the given batch group and group keys so
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# that if people blindly use the top level `next_batch` token
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# it returns more from the same group (if applicable) rather
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# than reverting to searching all results again.
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if batch_group and batch_group_key:
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global_next_batch = encode_base64(
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(
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"%s\n%s\n%s"
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% (batch_group, batch_group_key, pagination_token)
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).encode("ascii")
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)
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else:
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global_next_batch = encode_base64(
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("%s\n%s\n%s" % ("all", "", pagination_token)).encode("ascii")
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)
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for room_id, group in room_groups.items():
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group["next_batch"] = encode_base64(
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("%s\n%s\n%s" % ("room_id", room_id, pagination_token)).encode(
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"ascii"
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)
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)
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allowed_events.extend(room_events)
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else:
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# We should never get here due to the guard earlier.
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raise NotImplementedError()
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logger.info("Found %d events to return", len(allowed_events))
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# If client has asked for "context" for each event (i.e. some surrounding
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# events and state), fetch that
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if event_context is not None:
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now_token = self.hs.get_event_sources().get_current_token()
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contexts = {}
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for event in allowed_events:
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res = await self.store.get_events_around(
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event.room_id, event.event_id, before_limit, after_limit
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)
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logger.info(
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"Context for search returned %d and %d events",
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len(res["events_before"]),
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len(res["events_after"]),
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)
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res["events_before"] = await filter_events_for_client(
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self.storage, user.to_string(), res["events_before"]
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)
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res["events_after"] = await filter_events_for_client(
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self.storage, user.to_string(), res["events_after"]
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)
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res["start"] = await now_token.copy_and_replace(
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"room_key", res["start"]
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).to_string(self.store)
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res["end"] = await now_token.copy_and_replace(
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"room_key", res["end"]
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).to_string(self.store)
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if include_profile:
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senders = {
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ev.sender
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for ev in itertools.chain(
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res["events_before"], [event], res["events_after"]
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)
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}
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if res["events_after"]:
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last_event_id = res["events_after"][-1].event_id
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else:
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last_event_id = event.event_id
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state_filter = StateFilter.from_types(
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[(EventTypes.Member, sender) for sender in senders]
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)
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state = await self.state_store.get_state_for_event(
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last_event_id, state_filter
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)
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res["profile_info"] = {
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s.state_key: {
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"displayname": s.content.get("displayname", None),
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"avatar_url": s.content.get("avatar_url", None),
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}
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for s in state.values()
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if s.type == EventTypes.Member and s.state_key in senders
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}
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contexts[event.event_id] = res
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else:
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contexts = {}
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# TODO: Add a limit
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time_now = self.clock.time_msec()
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for context in contexts.values():
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context["events_before"] = await self._event_serializer.serialize_events(
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context["events_before"], time_now
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)
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context["events_after"] = await self._event_serializer.serialize_events(
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context["events_after"], time_now
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)
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state_results = {}
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if include_state:
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for room_id in {e.room_id for e in allowed_events}:
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state = await self.state_handler.get_current_state(room_id)
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state_results[room_id] = list(state.values())
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# We're now about to serialize the events. We should not make any
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# blocking calls after this. Otherwise the 'age' will be wrong
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results = []
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for e in allowed_events:
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results.append(
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{
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"rank": rank_map[e.event_id],
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"result": (
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await self._event_serializer.serialize_event(e, time_now)
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),
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"context": contexts.get(e.event_id, {}),
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}
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)
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rooms_cat_res = {
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"results": results,
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"count": count,
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"highlights": list(highlights),
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}
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if state_results:
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s = {}
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for room_id, state_events in state_results.items():
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s[room_id] = await self._event_serializer.serialize_events(
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state_events, time_now
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)
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rooms_cat_res["state"] = s
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if room_groups and "room_id" in group_keys:
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rooms_cat_res.setdefault("groups", {})["room_id"] = room_groups
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if sender_group and "sender" in group_keys:
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rooms_cat_res.setdefault("groups", {})["sender"] = sender_group
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if global_next_batch:
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rooms_cat_res["next_batch"] = global_next_batch
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return {"search_categories": {"room_events": rooms_cat_res}}
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