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watcha-synapse/synapse/rest/client/sync.py

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# 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 collections import defaultdict
from typing import (
TYPE_CHECKING,
Any,
Callable,
Dict,
Iterable,
List,
Optional,
Tuple,
Union,
)
from synapse.api.constants import Membership, PresenceState
from synapse.api.errors import Codes, StoreError, SynapseError
from synapse.api.filtering import FilterCollection
from synapse.api.presence import UserPresenceState
from synapse.events import EventBase
from synapse.events.utils import (
format_event_for_client_v2_without_room_id,
format_event_raw,
)
from synapse.handlers.presence import format_user_presence_state
from synapse.handlers.sync import (
ArchivedSyncResult,
InvitedSyncResult,
JoinedSyncResult,
KnockedSyncResult,
SyncConfig,
SyncResult,
)
from synapse.http.server import HttpServer
from synapse.http.servlet import RestServlet, parse_boolean, parse_integer, parse_string
from synapse.http.site import SynapseRequest
from synapse.logging.opentracing import trace
from synapse.types import JsonDict, StreamToken
from synapse.util import json_decoder
from ._base import client_patterns, set_timeline_upper_limit
if TYPE_CHECKING:
from synapse.server import HomeServer
logger = logging.getLogger(__name__)
class SyncRestServlet(RestServlet):
"""
GET parameters::
timeout(int): How long to wait for new events in milliseconds.
since(batch_token): Batch token when asking for incremental deltas.
set_presence(str): What state the device presence should be set to.
default is "online".
filter(filter_id): A filter to apply to the events returned.
Response JSON::
{
"next_batch": // batch token for the next /sync
"presence": // presence data for the user.
"rooms": {
"join": { // Joined rooms being updated.
"${room_id}": { // Id of the room being updated
"event_map": // Map of EventID -> event JSON.
"timeline": { // The recent events in the room if gap is "true"
"limited": // Was the per-room event limit exceeded?
// otherwise the next events in the room.
"events": [] // list of EventIDs in the "event_map".
"prev_batch": // back token for getting previous events.
}
"state": {"events": []} // list of EventIDs updating the
// current state to be what it should
// be at the end of the batch.
"ephemeral": {"events": []} // list of event objects
}
},
"invite": {}, // Invited rooms being updated.
"leave": {} // Archived rooms being updated.
}
}
"""
PATTERNS = client_patterns("/sync$")
ALLOWED_PRESENCE = {"online", "offline", "unavailable"}
def __init__(self, hs: "HomeServer"):
super().__init__()
self.hs = hs
self.auth = hs.get_auth()
self.store = hs.get_datastore()
self.sync_handler = hs.get_sync_handler()
self.clock = hs.get_clock()
self.filtering = hs.get_filtering()
self.presence_handler = hs.get_presence_handler()
self._server_notices_sender = hs.get_server_notices_sender()
self._event_serializer = hs.get_event_client_serializer()
async def on_GET(self, request: SynapseRequest) -> Tuple[int, JsonDict]:
# This will always be set by the time Twisted calls us.
assert request.args is not None
if b"from" in request.args:
# /events used to use 'from', but /sync uses 'since'.
# Lets be helpful and whine if we see a 'from'.
raise SynapseError(
400, "'from' is not a valid query parameter. Did you mean 'since'?"
)
requester = await self.auth.get_user_by_req(request, allow_guest=True)
user = requester.user
device_id = requester.device_id
timeout = parse_integer(request, "timeout", default=0)
since = parse_string(request, "since")
set_presence = parse_string(
request,
"set_presence",
default="online",
allowed_values=self.ALLOWED_PRESENCE,
)
filter_id = parse_string(request, "filter")
full_state = parse_boolean(request, "full_state", default=False)
logger.debug(
"/sync: user=%r, timeout=%r, since=%r, "
"set_presence=%r, filter_id=%r, device_id=%r",
user,
timeout,
since,
set_presence,
filter_id,
device_id,
)
request_key = (user, timeout, since, filter_id, full_state, device_id)
if filter_id is None:
filter_collection = self.filtering.DEFAULT_FILTER_COLLECTION
elif filter_id.startswith("{"):
try:
filter_object = json_decoder.decode(filter_id)
set_timeline_upper_limit(
filter_object, self.hs.config.server.filter_timeline_limit
)
except Exception:
raise SynapseError(400, "Invalid filter JSON")
self.filtering.check_valid_filter(filter_object)
filter_collection = FilterCollection(self.hs, filter_object)
else:
try:
filter_collection = await self.filtering.get_user_filter(
user.localpart, filter_id
)
except StoreError as err:
if err.code != 404:
raise
# fix up the description and errcode to be more useful
raise SynapseError(400, "No such filter", errcode=Codes.INVALID_PARAM)
sync_config = SyncConfig(
user=user,
filter_collection=filter_collection,
is_guest=requester.is_guest,
request_key=request_key,
device_id=device_id,
)
since_token = None
if since is not None:
since_token = await StreamToken.from_string(self.store, since)
# send any outstanding server notices to the user.
await self._server_notices_sender.on_user_syncing(user.to_string())
affect_presence = set_presence != PresenceState.OFFLINE
if affect_presence:
await self.presence_handler.set_state(
user, {"presence": set_presence}, True
)
context = await self.presence_handler.user_syncing(
user.to_string(), affect_presence=affect_presence
)
with context:
sync_result = await self.sync_handler.wait_for_sync_for_user(
requester,
sync_config,
since_token=since_token,
timeout=timeout,
full_state=full_state,
)
# the client may have disconnected by now; don't bother to serialize the
# response if so.
if request._disconnected:
logger.info("Client has disconnected; not serializing response.")
return 200, {}
time_now = self.clock.time_msec()
# We know that the the requester has an access token since appservices
# cannot use sync.
response_content = await self.encode_response(
time_now, sync_result, requester.access_token_id, filter_collection
)
logger.debug("Event formatting complete")
return 200, response_content
@trace(opname="sync.encode_response")
async def encode_response(
self,
time_now: int,
sync_result: SyncResult,
access_token_id: Optional[int],
filter: FilterCollection,
) -> JsonDict:
logger.debug("Formatting events in sync response")
if filter.event_format == "client":
event_formatter = format_event_for_client_v2_without_room_id
elif filter.event_format == "federation":
event_formatter = format_event_raw
else:
raise Exception("Unknown event format %s" % (filter.event_format,))
joined = await self.encode_joined(
sync_result.joined,
time_now,
access_token_id,
filter.event_fields,
event_formatter,
)
invited = await self.encode_invited(
sync_result.invited, time_now, access_token_id, event_formatter
)
knocked = await self.encode_knocked(
sync_result.knocked, time_now, access_token_id, event_formatter
)
archived = await self.encode_archived(
sync_result.archived,
time_now,
access_token_id,
filter.event_fields,
event_formatter,
)
logger.debug("building sync response dict")
response: JsonDict = defaultdict(dict)
response["next_batch"] = await sync_result.next_batch.to_string(self.store)
if sync_result.account_data:
response["account_data"] = {"events": sync_result.account_data}
if sync_result.presence:
response["presence"] = SyncRestServlet.encode_presence(
sync_result.presence, time_now
)
if sync_result.to_device:
response["to_device"] = {"events": sync_result.to_device}
if sync_result.device_lists.changed:
response["device_lists"]["changed"] = list(sync_result.device_lists.changed)
if sync_result.device_lists.left:
response["device_lists"]["left"] = list(sync_result.device_lists.left)
# We always include this because https://github.com/vector-im/element-android/issues/3725
# The spec isn't terribly clear on when this can be omitted and how a client would tell
# the difference between "no keys present" and "nothing changed" in terms of whole field
# absent / individual key type entry absent
# Corresponding synapse issue: https://github.com/matrix-org/synapse/issues/10456
response["device_one_time_keys_count"] = sync_result.device_one_time_keys_count
# https://github.com/matrix-org/matrix-doc/blob/54255851f642f84a4f1aaf7bc063eebe3d76752b/proposals/2732-olm-fallback-keys.md
# states that this field should always be included, as long as the server supports the feature.
response[
"org.matrix.msc2732.device_unused_fallback_key_types"
] = sync_result.device_unused_fallback_key_types
response[
"device_unused_fallback_key_types"
] = sync_result.device_unused_fallback_key_types
if joined:
response["rooms"][Membership.JOIN] = joined
if invited:
response["rooms"][Membership.INVITE] = invited
if knocked:
response["rooms"][Membership.KNOCK] = knocked
if archived:
response["rooms"][Membership.LEAVE] = archived
# By the time we get here groups is no longer optional.
assert sync_result.groups is not None
if sync_result.groups.join:
response["groups"][Membership.JOIN] = sync_result.groups.join
if sync_result.groups.invite:
response["groups"][Membership.INVITE] = sync_result.groups.invite
if sync_result.groups.leave:
response["groups"][Membership.LEAVE] = sync_result.groups.leave
return response
@staticmethod
def encode_presence(events: List[UserPresenceState], time_now: int) -> JsonDict:
return {
"events": [
{
"type": "m.presence",
"sender": event.user_id,
"content": format_user_presence_state(
event, time_now, include_user_id=False
),
}
for event in events
]
}
@trace(opname="sync.encode_joined")
async def encode_joined(
self,
rooms: List[JoinedSyncResult],
time_now: int,
token_id: Optional[int],
event_fields: List[str],
event_formatter: Callable[[JsonDict], JsonDict],
) -> JsonDict:
"""
Encode the joined rooms in a sync result
Args:
rooms: list of sync results for rooms this user is joined to
time_now: current time - used as a baseline for age calculations
token_id: ID of the user's auth token - used for namespacing
of transaction IDs
event_fields: List of event fields to include. If empty,
all fields will be returned.
event_formatter: function to convert from federation format
to client format
Returns:
The joined rooms list, in our response format
"""
joined = {}
for room in rooms:
joined[room.room_id] = await self.encode_room(
room,
time_now,
token_id,
joined=True,
only_fields=event_fields,
event_formatter=event_formatter,
)
return joined
@trace(opname="sync.encode_invited")
async def encode_invited(
self,
rooms: List[InvitedSyncResult],
time_now: int,
token_id: Optional[int],
event_formatter: Callable[[JsonDict], JsonDict],
) -> JsonDict:
"""
Encode the invited rooms in a sync result
Args:
rooms: list of sync results for rooms this user is invited to
time_now: current time - used as a baseline for age calculations
token_id: ID of the user's auth token - used for namespacing
of transaction IDs
event_formatter: function to convert from federation format
to client format
Returns:
The invited rooms list, in our response format
"""
invited = {}
for room in rooms:
invite = self._event_serializer.serialize_event(
room.invite,
time_now,
token_id=token_id,
event_format=event_formatter,
include_stripped_room_state=True,
)
unsigned = dict(invite.get("unsigned", {}))
invite["unsigned"] = unsigned
invited_state = list(unsigned.pop("invite_room_state", []))
invited_state.append(invite)
invited[room.room_id] = {"invite_state": {"events": invited_state}}
return invited
@trace(opname="sync.encode_knocked")
async def encode_knocked(
self,
rooms: List[KnockedSyncResult],
time_now: int,
token_id: Optional[int],
event_formatter: Callable[[Dict], Dict],
) -> Dict[str, Dict[str, Any]]:
"""
Encode the rooms we've knocked on in a sync result.
Args:
rooms: list of sync results for rooms this user is knocking on
time_now: current time - used as a baseline for age calculations
token_id: ID of the user's auth token - used for namespacing of transaction IDs
event_formatter: function to convert from federation format to client format
Returns:
The list of rooms the user has knocked on, in our response format.
"""
knocked = {}
for room in rooms:
knock = self._event_serializer.serialize_event(
room.knock,
time_now,
token_id=token_id,
event_format=event_formatter,
include_stripped_room_state=True,
)
# Extract the `unsigned` key from the knock event.
# This is where we (cheekily) store the knock state events
unsigned = knock.setdefault("unsigned", {})
# Duplicate the dictionary in order to avoid modifying the original
unsigned = dict(unsigned)
# Extract the stripped room state from the unsigned dict
# This is for clients to get a little bit of information about
# the room they've knocked on, without revealing any sensitive information
knocked_state = list(unsigned.pop("knock_room_state", []))
# Append the actual knock membership event itself as well. This provides
# the client with:
#
# * A knock state event that they can use for easier internal tracking
# * The rough timestamp of when the knock occurred contained within the event
knocked_state.append(knock)
# Build the `knock_state` dictionary, which will contain the state of the
# room that the client has knocked on
knocked[room.room_id] = {"knock_state": {"events": knocked_state}}
return knocked
@trace(opname="sync.encode_archived")
async def encode_archived(
self,
rooms: List[ArchivedSyncResult],
time_now: int,
token_id: Optional[int],
event_fields: List[str],
event_formatter: Callable[[JsonDict], JsonDict],
) -> JsonDict:
"""
Encode the archived rooms in a sync result
Args:
rooms: list of sync results for rooms this user is joined to
time_now: current time - used as a baseline for age calculations
token_id: ID of the user's auth token - used for namespacing
of transaction IDs
event_fields: List of event fields to include. If empty,
all fields will be returned.
event_formatter: function to convert from federation format to client format
Returns:
The archived rooms list, in our response format
"""
joined = {}
for room in rooms:
joined[room.room_id] = await self.encode_room(
room,
time_now,
token_id,
joined=False,
only_fields=event_fields,
event_formatter=event_formatter,
)
return joined
async def encode_room(
self,
room: Union[JoinedSyncResult, ArchivedSyncResult],
time_now: int,
token_id: Optional[int],
joined: bool,
only_fields: Optional[List[str]],
event_formatter: Callable[[JsonDict], JsonDict],
) -> JsonDict:
"""
Args:
room: sync result for a single room
time_now: current time - used as a baseline for age calculations
token_id: ID of the user's auth token - used for namespacing
of transaction IDs
joined: True if the user is joined to this room - will mean
we handle ephemeral events
only_fields: Optional. The list of event fields to include.
event_formatter: function to convert from federation format
to client format
Returns:
The room, encoded in our response format
"""
def serialize(
events: Iterable[EventBase],
aggregations: Optional[Dict[str, Dict[str, Any]]] = None,
) -> List[JsonDict]:
return self._event_serializer.serialize_events(
events,
time_now=time_now,
bundle_aggregations=aggregations,
token_id=token_id,
event_format=event_formatter,
only_event_fields=only_fields,
)
state_dict = room.state
timeline_events = room.timeline.events
state_events = state_dict.values()
for event in itertools.chain(state_events, timeline_events):
# We've had bug reports that events were coming down under the
# wrong room.
if event.room_id != room.room_id:
logger.warning(
"Event %r is under room %r instead of %r",
event.event_id,
room.room_id,
event.room_id,
)
serialized_state = serialize(state_events)
serialized_timeline = serialize(
timeline_events, room.timeline.bundled_aggregations
)
account_data = room.account_data
result: JsonDict = {
"timeline": {
"events": serialized_timeline,
"prev_batch": await room.timeline.prev_batch.to_string(self.store),
"limited": room.timeline.limited,
},
"state": {"events": serialized_state},
"account_data": {"events": account_data},
}
if joined:
assert isinstance(room, JoinedSyncResult)
ephemeral_events = room.ephemeral
result["ephemeral"] = {"events": ephemeral_events}
result["unread_notifications"] = room.unread_notifications
result["summary"] = room.summary
result["org.matrix.msc2654.unread_count"] = room.unread_count
return result
def register_servlets(hs: "HomeServer", http_server: HttpServer) -> None:
SyncRestServlet(hs).register(http_server)