281 lines
10 KiB
Python
281 lines
10 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 logging
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from typing import TYPE_CHECKING, Iterable, List, Optional, Tuple
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from synapse.api.constants import ReadReceiptEventFields
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from synapse.appservice import ApplicationService
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from synapse.streams import EventSource
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from synapse.types import JsonDict, ReadReceipt, UserID, get_domain_from_id
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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 ReceiptsHandler:
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def __init__(self, hs: "HomeServer"):
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self.notifier = hs.get_notifier()
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self.server_name = hs.config.server.server_name
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self.store = hs.get_datastore()
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self.event_auth_handler = hs.get_event_auth_handler()
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self.hs = hs
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# We only need to poke the federation sender explicitly if its on the
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# same instance. Other federation sender instances will get notified by
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# `synapse.app.generic_worker.FederationSenderHandler` when it sees it
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# in the receipts stream.
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self.federation_sender = None
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if hs.should_send_federation():
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self.federation_sender = hs.get_federation_sender()
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# If we can handle the receipt EDUs we do so, otherwise we route them
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# to the appropriate worker.
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if hs.get_instance_name() in hs.config.worker.writers.receipts:
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hs.get_federation_registry().register_edu_handler(
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"m.receipt", self._received_remote_receipt
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)
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else:
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hs.get_federation_registry().register_instances_for_edu(
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"m.receipt",
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hs.config.worker.writers.receipts,
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)
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self.clock = self.hs.get_clock()
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self.state = hs.get_state_handler()
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async def _received_remote_receipt(self, origin: str, content: JsonDict) -> None:
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"""Called when we receive an EDU of type m.receipt from a remote HS."""
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receipts = []
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for room_id, room_values in content.items():
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# If we're not in the room just ditch the event entirely. This is
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# probably an old server that has come back and thinks we're still in
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# the room (or we've been rejoined to the room by a state reset).
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is_in_room = await self.event_auth_handler.check_host_in_room(
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room_id, self.server_name
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)
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if not is_in_room:
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logger.info(
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"Ignoring receipt for room %r from server %s as we're not in the room",
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room_id,
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origin,
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)
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continue
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for receipt_type, users in room_values.items():
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for user_id, user_values in users.items():
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if get_domain_from_id(user_id) != origin:
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logger.info(
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"Received receipt for user %r from server %s, ignoring",
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user_id,
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origin,
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)
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continue
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receipts.append(
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ReadReceipt(
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room_id=room_id,
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receipt_type=receipt_type,
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user_id=user_id,
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event_ids=user_values["event_ids"],
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data=user_values.get("data", {}),
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)
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)
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await self._handle_new_receipts(receipts)
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async def _handle_new_receipts(self, receipts: List[ReadReceipt]) -> bool:
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"""Takes a list of receipts, stores them and informs the notifier."""
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min_batch_id: Optional[int] = None
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max_batch_id: Optional[int] = None
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for receipt in receipts:
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res = await self.store.insert_receipt(
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receipt.room_id,
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receipt.receipt_type,
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receipt.user_id,
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receipt.event_ids,
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receipt.data,
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)
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if not res:
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# res will be None if this read receipt is 'old'
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continue
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stream_id, max_persisted_id = res
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if min_batch_id is None or stream_id < min_batch_id:
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min_batch_id = stream_id
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if max_batch_id is None or max_persisted_id > max_batch_id:
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max_batch_id = max_persisted_id
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# Either both of these should be None or neither.
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if min_batch_id is None or max_batch_id is None:
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# no new receipts
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return False
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affected_room_ids = list({r.room_id for r in receipts})
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self.notifier.on_new_event("receipt_key", max_batch_id, rooms=affected_room_ids)
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# Note that the min here shouldn't be relied upon to be accurate.
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await self.hs.get_pusherpool().on_new_receipts(
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min_batch_id, max_batch_id, affected_room_ids
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)
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return True
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async def received_client_receipt(
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self, room_id: str, receipt_type: str, user_id: str, event_id: str, hidden: bool
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) -> None:
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"""Called when a client tells us a local user has read up to the given
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event_id in the room.
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"""
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receipt = ReadReceipt(
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room_id=room_id,
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receipt_type=receipt_type,
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user_id=user_id,
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event_ids=[event_id],
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data={"ts": int(self.clock.time_msec()), "hidden": hidden},
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)
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is_new = await self._handle_new_receipts([receipt])
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if not is_new:
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return
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if self.federation_sender and not (
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self.hs.config.experimental.msc2285_enabled and hidden
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):
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await self.federation_sender.send_read_receipt(receipt)
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class ReceiptEventSource(EventSource[int, JsonDict]):
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def __init__(self, hs: "HomeServer"):
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self.store = hs.get_datastore()
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self.config = hs.config
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@staticmethod
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def filter_out_hidden(events: List[JsonDict], user_id: str) -> List[JsonDict]:
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visible_events = []
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# filter out hidden receipts the user shouldn't see
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for event in events:
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content = event.get("content", {})
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new_event = event.copy()
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new_event["content"] = {}
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for event_id in content.keys():
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event_content = content.get(event_id, {})
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m_read = event_content.get("m.read", {})
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# If m_read is missing copy over the original event_content as there is nothing to process here
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if not m_read:
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new_event["content"][event_id] = event_content.copy()
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continue
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new_users = {}
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for rr_user_id, user_rr in m_read.items():
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try:
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hidden = user_rr.get("hidden")
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except AttributeError:
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# Due to https://github.com/matrix-org/synapse/issues/10376
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# there are cases where user_rr is a string, in those cases
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# we just ignore the read receipt
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continue
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if hidden is not True or rr_user_id == user_id:
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new_users[rr_user_id] = user_rr.copy()
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# If hidden has a value replace hidden with the correct prefixed key
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if hidden is not None:
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new_users[rr_user_id].pop("hidden")
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new_users[rr_user_id][
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ReadReceiptEventFields.MSC2285_HIDDEN
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] = hidden
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# Set new users unless empty
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if len(new_users.keys()) > 0:
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new_event["content"][event_id] = {"m.read": new_users}
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# Append new_event to visible_events unless empty
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if len(new_event["content"].keys()) > 0:
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visible_events.append(new_event)
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return visible_events
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async def get_new_events(
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self,
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user: UserID,
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from_key: int,
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limit: Optional[int],
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room_ids: Iterable[str],
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is_guest: bool,
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explicit_room_id: Optional[str] = None,
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) -> Tuple[List[JsonDict], int]:
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from_key = int(from_key)
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to_key = self.get_current_key()
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if from_key == to_key:
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return [], to_key
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events = await self.store.get_linearized_receipts_for_rooms(
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room_ids, from_key=from_key, to_key=to_key
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)
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if self.config.experimental.msc2285_enabled:
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events = ReceiptEventSource.filter_out_hidden(events, user.to_string())
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return events, to_key
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async def get_new_events_as(
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self, from_key: int, service: ApplicationService
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) -> Tuple[List[JsonDict], int]:
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"""Returns a set of new read receipt events that an appservice
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may be interested in.
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Args:
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from_key: the stream position at which events should be fetched from
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service: The appservice which may be interested
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Returns:
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A two-tuple containing the following:
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* A list of json dictionaries derived from read receipts that the
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appservice may be interested in.
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* The current read receipt stream token.
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"""
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from_key = int(from_key)
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to_key = self.get_current_key()
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if from_key == to_key:
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return [], to_key
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# Fetch all read receipts for all rooms, up to a limit of 100. This is ordered
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# by most recent.
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rooms_to_events = await self.store.get_linearized_receipts_for_all_rooms(
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from_key=from_key, to_key=to_key
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)
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# Then filter down to rooms that the AS can read
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events = []
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for room_id, event in rooms_to_events.items():
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if not await service.matches_user_in_member_list(room_id, self.store):
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continue
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events.append(event)
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return events, to_key
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def get_current_key(self, direction: str = "f") -> int:
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return self.store.get_max_receipt_stream_id()
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