1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
|
# Copyright 2014-2016 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 logging
import random
from typing import TYPE_CHECKING, Iterable, List, Optional
from synapse.api.constants import EduTypes, EventTypes, Membership
from synapse.api.errors import AuthError, SynapseError
from synapse.events import EventBase
from synapse.handlers.presence import format_user_presence_state
from synapse.logging.utils import log_function
from synapse.streams.config import PaginationConfig
from synapse.types import JsonDict, UserID
from synapse.visibility import filter_events_for_client
if TYPE_CHECKING:
from synapse.server import HomeServer
logger = logging.getLogger(__name__)
class EventStreamHandler:
def __init__(self, hs: "HomeServer"):
self.store = hs.get_datastore()
self.clock = hs.get_clock()
self.hs = hs
self.notifier = hs.get_notifier()
self.state = hs.get_state_handler()
self._server_notices_sender = hs.get_server_notices_sender()
self._event_serializer = hs.get_event_client_serializer()
@log_function
async def get_stream(
self,
auth_user_id: str,
pagin_config: PaginationConfig,
timeout: int = 0,
as_client_event: bool = True,
affect_presence: bool = True,
room_id: Optional[str] = None,
is_guest: bool = False,
) -> JsonDict:
"""Fetches the events stream for a given user."""
if room_id:
blocked = await self.store.is_room_blocked(room_id)
if blocked:
raise SynapseError(403, "This room has been blocked on this server")
# send any outstanding server notices to the user.
await self._server_notices_sender.on_user_syncing(auth_user_id)
auth_user = UserID.from_string(auth_user_id)
presence_handler = self.hs.get_presence_handler()
context = await presence_handler.user_syncing(
auth_user_id, affect_presence=affect_presence
)
with context:
if timeout:
# If they've set a timeout set a minimum limit.
timeout = max(timeout, 500)
# Add some randomness to this value to try and mitigate against
# thundering herds on restart.
timeout = random.randint(int(timeout * 0.9), int(timeout * 1.1))
stream_result = await self.notifier.get_events_for(
auth_user,
pagin_config,
timeout,
is_guest=is_guest,
explicit_room_id=room_id,
)
events = stream_result.events
time_now = self.clock.time_msec()
# When the user joins a new room, or another user joins a currently
# joined room, we need to send down presence for those users.
to_add: List[JsonDict] = []
for event in events:
if not isinstance(event, EventBase):
continue
if event.type == EventTypes.Member:
if event.membership != Membership.JOIN:
continue
# Send down presence.
if event.state_key == auth_user_id:
# Send down presence for everyone in the room.
users: Iterable[str] = await self.store.get_users_in_room(
event.room_id
)
else:
users = [event.state_key]
states = await presence_handler.get_states(users)
to_add.extend(
{
"type": EduTypes.Presence,
"content": format_user_presence_state(state, time_now),
}
for state in states
)
events.extend(to_add)
chunks = await self._event_serializer.serialize_events(
events,
time_now,
as_client_event=as_client_event,
)
chunk = {
"chunk": chunks,
"start": await stream_result.start_token.to_string(self.store),
"end": await stream_result.end_token.to_string(self.store),
}
return chunk
class EventHandler:
def __init__(self, hs: "HomeServer"):
self.store = hs.get_datastore()
self.storage = hs.get_storage()
async def get_event(
self, user: UserID, room_id: Optional[str], event_id: str
) -> Optional[EventBase]:
"""Retrieve a single specified event.
Args:
user: The user requesting the event
room_id: The expected room id. We'll return None if the
event's room does not match.
event_id: The event ID to obtain.
Returns:
An event, or None if there is no event matching this ID.
Raises:
SynapseError if there was a problem retrieving this event, or
AuthError if the user does not have the rights to inspect this
event.
"""
event = await self.store.get_event(event_id, check_room_id=room_id)
if not event:
return None
users = await self.store.get_users_in_room(event.room_id)
is_peeking = user.to_string() not in users
filtered = await filter_events_for_client(
self.storage, user.to_string(), [event], is_peeking=is_peeking
)
if not filtered:
raise AuthError(403, "You don't have permission to access that event.")
return event
|
