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- # -*- coding: utf-8 -*-
- # Copyright 2015, 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 itertools
- import logging
- from unpaddedbase64 import decode_base64, encode_base64
- from twisted.internet import defer
- from synapse.api.constants import EventTypes, Membership
- from synapse.api.errors import SynapseError
- from synapse.api.filtering import Filter
- from synapse.storage.state import StateFilter
- from synapse.visibility import filter_events_for_client
- from ._base import BaseHandler
- logger = logging.getLogger(__name__)
- class SearchHandler(BaseHandler):
- def __init__(self, hs):
- super(SearchHandler, self).__init__(hs)
- self._event_serializer = hs.get_event_client_serializer()
- @defer.inlineCallbacks
- def get_old_rooms_from_upgraded_room(self, room_id):
- """Retrieves room IDs of old rooms in the history of an upgraded room.
- We do so by checking the m.room.create event of the room for a
- `predecessor` key. If it exists, we add the room ID to our return
- list and then check that room for a m.room.create event and so on
- until we can no longer find any more previous rooms.
- The full list of all found rooms in then returned.
- Args:
- room_id (str): id of the room to search through.
- Returns:
- Deferred[iterable[unicode]]: predecessor room ids
- """
- historical_room_ids = []
- while True:
- predecessor = yield self.store.get_room_predecessor(room_id)
- # If no predecessor, assume we've hit a dead end
- if not predecessor:
- break
- # Add predecessor's room ID
- historical_room_ids.append(predecessor["room_id"])
- # Scan through the old room for further predecessors
- room_id = predecessor["room_id"]
- return historical_room_ids
- @defer.inlineCallbacks
- def search(self, user, content, batch=None):
- """Performs a full text search for a user.
- Args:
- user (UserID)
- content (dict): Search parameters
- batch (str): The next_batch parameter. Used for pagination.
- Returns:
- dict to be returned to the client with results of search
- """
- if not self.hs.config.enable_search:
- raise SynapseError(400, "Search is disabled on this homeserver")
- batch_group = None
- batch_group_key = None
- batch_token = None
- if batch:
- try:
- b = decode_base64(batch).decode("ascii")
- batch_group, batch_group_key, batch_token = b.split("\n")
- assert batch_group is not None
- assert batch_group_key is not None
- assert batch_token is not None
- except Exception:
- raise SynapseError(400, "Invalid batch")
- logger.info(
- "Search batch properties: %r, %r, %r",
- batch_group,
- batch_group_key,
- batch_token,
- )
- logger.info("Search content: %s", content)
- try:
- room_cat = content["search_categories"]["room_events"]
- # The actual thing to query in FTS
- search_term = room_cat["search_term"]
- # Which "keys" to search over in FTS query
- keys = room_cat.get(
- "keys", ["content.body", "content.name", "content.topic"]
- )
- # Filter to apply to results
- filter_dict = room_cat.get("filter", {})
- # What to order results by (impacts whether pagination can be doen)
- order_by = room_cat.get("order_by", "rank")
- # Return the current state of the rooms?
- include_state = room_cat.get("include_state", False)
- # Include context around each event?
- event_context = room_cat.get("event_context", None)
- # Group results together? May allow clients to paginate within a
- # group
- group_by = room_cat.get("groupings", {}).get("group_by", {})
- group_keys = [g["key"] for g in group_by]
- if event_context is not None:
- before_limit = int(event_context.get("before_limit", 5))
- after_limit = int(event_context.get("after_limit", 5))
- # Return the historic display name and avatar for the senders
- # of the events?
- include_profile = bool(event_context.get("include_profile", False))
- except KeyError:
- raise SynapseError(400, "Invalid search query")
- if order_by not in ("rank", "recent"):
- raise SynapseError(400, "Invalid order by: %r" % (order_by,))
- if set(group_keys) - {"room_id", "sender"}:
- raise SynapseError(
- 400,
- "Invalid group by keys: %r"
- % (set(group_keys) - {"room_id", "sender"},),
- )
- search_filter = Filter(filter_dict)
- # TODO: Search through left rooms too
- rooms = yield self.store.get_rooms_for_user_where_membership_is(
- user.to_string(),
- membership_list=[Membership.JOIN],
- # membership_list=[Membership.JOIN, Membership.LEAVE, Membership.Ban],
- )
- room_ids = set(r.room_id for r in rooms)
- # If doing a subset of all rooms seearch, check if any of the rooms
- # are from an upgraded room, and search their contents as well
- if search_filter.rooms:
- historical_room_ids = []
- for room_id in search_filter.rooms:
- # Add any previous rooms to the search if they exist
- ids = yield self.get_old_rooms_from_upgraded_room(room_id)
- historical_room_ids += ids
- # Prevent any historical events from being filtered
- search_filter = search_filter.with_room_ids(historical_room_ids)
- room_ids = search_filter.filter_rooms(room_ids)
- if batch_group == "room_id":
- room_ids.intersection_update({batch_group_key})
- if not room_ids:
- return {
- "search_categories": {
- "room_events": {"results": [], "count": 0, "highlights": []}
- }
- }
- rank_map = {} # event_id -> rank of event
- allowed_events = []
- room_groups = {} # Holds result of grouping by room, if applicable
- sender_group = {} # Holds result of grouping by sender, if applicable
- # Holds the next_batch for the entire result set if one of those exists
- global_next_batch = None
- highlights = set()
- count = None
- if order_by == "rank":
- search_result = yield self.store.search_msgs(room_ids, search_term, keys)
- count = search_result["count"]
- if search_result["highlights"]:
- highlights.update(search_result["highlights"])
- results = search_result["results"]
- results_map = {r["event"].event_id: r for r in results}
- rank_map.update({r["event"].event_id: r["rank"] for r in results})
- filtered_events = search_filter.filter([r["event"] for r in results])
- events = yield filter_events_for_client(
- self.store, user.to_string(), filtered_events
- )
- events.sort(key=lambda e: -rank_map[e.event_id])
- allowed_events = events[: search_filter.limit()]
- for e in allowed_events:
- rm = room_groups.setdefault(
- e.room_id, {"results": [], "order": rank_map[e.event_id]}
- )
- rm["results"].append(e.event_id)
- s = sender_group.setdefault(
- e.sender, {"results": [], "order": rank_map[e.event_id]}
- )
- s["results"].append(e.event_id)
- elif order_by == "recent":
- room_events = []
- i = 0
- pagination_token = batch_token
- # We keep looping and we keep filtering until we reach the limit
- # or we run out of things.
- # But only go around 5 times since otherwise synapse will be sad.
- while len(room_events) < search_filter.limit() and i < 5:
- i += 1
- search_result = yield self.store.search_rooms(
- room_ids,
- search_term,
- keys,
- search_filter.limit() * 2,
- pagination_token=pagination_token,
- )
- if search_result["highlights"]:
- highlights.update(search_result["highlights"])
- count = search_result["count"]
- results = search_result["results"]
- results_map = {r["event"].event_id: r for r in results}
- rank_map.update({r["event"].event_id: r["rank"] for r in results})
- filtered_events = search_filter.filter([r["event"] for r in results])
- events = yield filter_events_for_client(
- self.store, user.to_string(), filtered_events
- )
- room_events.extend(events)
- room_events = room_events[: search_filter.limit()]
- if len(results) < search_filter.limit() * 2:
- pagination_token = None
- break
- else:
- pagination_token = results[-1]["pagination_token"]
- for event in room_events:
- group = room_groups.setdefault(event.room_id, {"results": []})
- group["results"].append(event.event_id)
- if room_events and len(room_events) >= search_filter.limit():
- last_event_id = room_events[-1].event_id
- pagination_token = results_map[last_event_id]["pagination_token"]
- # We want to respect the given batch group and group keys so
- # that if people blindly use the top level `next_batch` token
- # it returns more from the same group (if applicable) rather
- # than reverting to searching all results again.
- if batch_group and batch_group_key:
- global_next_batch = encode_base64(
- (
- "%s\n%s\n%s"
- % (batch_group, batch_group_key, pagination_token)
- ).encode("ascii")
- )
- else:
- global_next_batch = encode_base64(
- ("%s\n%s\n%s" % ("all", "", pagination_token)).encode("ascii")
- )
- for room_id, group in room_groups.items():
- group["next_batch"] = encode_base64(
- ("%s\n%s\n%s" % ("room_id", room_id, pagination_token)).encode(
- "ascii"
- )
- )
- allowed_events.extend(room_events)
- else:
- # We should never get here due to the guard earlier.
- raise NotImplementedError()
- logger.info("Found %d events to return", len(allowed_events))
- # If client has asked for "context" for each event (i.e. some surrounding
- # events and state), fetch that
- if event_context is not None:
- now_token = yield self.hs.get_event_sources().get_current_token()
- contexts = {}
- for event in allowed_events:
- res = yield self.store.get_events_around(
- event.room_id, event.event_id, before_limit, after_limit
- )
- logger.info(
- "Context for search returned %d and %d events",
- len(res["events_before"]),
- len(res["events_after"]),
- )
- res["events_before"] = yield filter_events_for_client(
- self.store, user.to_string(), res["events_before"]
- )
- res["events_after"] = yield filter_events_for_client(
- self.store, user.to_string(), res["events_after"]
- )
- res["start"] = now_token.copy_and_replace(
- "room_key", res["start"]
- ).to_string()
- res["end"] = now_token.copy_and_replace(
- "room_key", res["end"]
- ).to_string()
- if include_profile:
- senders = set(
- ev.sender
- for ev in itertools.chain(
- res["events_before"], [event], res["events_after"]
- )
- )
- if res["events_after"]:
- last_event_id = res["events_after"][-1].event_id
- else:
- last_event_id = event.event_id
- state_filter = StateFilter.from_types(
- [(EventTypes.Member, sender) for sender in senders]
- )
- state = yield self.store.get_state_for_event(
- last_event_id, state_filter
- )
- res["profile_info"] = {
- s.state_key: {
- "displayname": s.content.get("displayname", None),
- "avatar_url": s.content.get("avatar_url", None),
- }
- for s in state.values()
- if s.type == EventTypes.Member and s.state_key in senders
- }
- contexts[event.event_id] = res
- else:
- contexts = {}
- # TODO: Add a limit
- time_now = self.clock.time_msec()
- for context in contexts.values():
- context["events_before"] = (
- yield self._event_serializer.serialize_events(
- context["events_before"], time_now
- )
- )
- context["events_after"] = (
- yield self._event_serializer.serialize_events(
- context["events_after"], time_now
- )
- )
- state_results = {}
- if include_state:
- rooms = set(e.room_id for e in allowed_events)
- for room_id in rooms:
- state = yield self.state_handler.get_current_state(room_id)
- state_results[room_id] = list(state.values())
- state_results.values()
- # We're now about to serialize the events. We should not make any
- # blocking calls after this. Otherwise the 'age' will be wrong
- results = []
- for e in allowed_events:
- results.append(
- {
- "rank": rank_map[e.event_id],
- "result": (
- yield self._event_serializer.serialize_event(e, time_now)
- ),
- "context": contexts.get(e.event_id, {}),
- }
- )
- rooms_cat_res = {
- "results": results,
- "count": count,
- "highlights": list(highlights),
- }
- if state_results:
- s = {}
- for room_id, state in state_results.items():
- s[room_id] = yield self._event_serializer.serialize_events(
- state, time_now
- )
- rooms_cat_res["state"] = s
- if room_groups and "room_id" in group_keys:
- rooms_cat_res.setdefault("groups", {})["room_id"] = room_groups
- if sender_group and "sender" in group_keys:
- rooms_cat_res.setdefault("groups", {})["sender"] = sender_group
- if global_next_batch:
- rooms_cat_res["next_batch"] = global_next_batch
- return {"search_categories": {"room_events": rooms_cat_res}}
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