summary refs log tree commit diff
path: root/synapse/handlers/user_directory.py
blob: f4451e5dfbb940bb4f9b8d284a4ed45eb6884f0d (plain) (blame)
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
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
# -*- coding: utf-8 -*-
# Copyright 2017 Vector Creations 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

from twisted.internet import defer

from synapse.api.constants import EventTypes, JoinRules, Membership
from synapse.storage.roommember import ProfileInfo
from synapse.util.metrics import Measure


logger = logging.getLogger(__name__)


class UserDirectoyHandler(object):
    """Handles querying of and keeping updated the user_directory.

    N.B.: ASSUMES IT IS THE ONLY THING THAT MODIFIES THE USER DIRECTORY

    The user directory is filled with users who this server can see are joined to a
    world_readable or publically joinable room. We keep a database table up to date
    by streaming changes of the current state and recalculating whether users should
    be in the directory or not when necessary.

    For each user in the directory we also store a room_id which is public and that the
    user is joined to. This allows us to ignore history_visibility and join_rules changes
    for that user in all other public rooms, as we know they'll still be in at least
    one public room.
    """

    def __init__(self, hs):
        self.store = hs.get_datastore()
        self.state = hs.get_state_handler()
        self.server_name = hs.hostname
        self.clock = hs.get_clock()
        self.notifier = hs.get_notifier()

        self.notifier.add_replication_callback(self.notify_new_event)

        # When start up for the first time we need to populate the user_directory.
        # This is a set of user_id's we've inserted already
        self.initially_handled_users = set()
        self.initially_handled_users_in_public = set()

        # The current position in the current_state_delta stream
        self.pos = None

        # Guard to ensure we only process deltas one at a time
        self._is_processing = False

        # We kick this off so that we don't have to wait for a change before
        # we start populating the user directory
        self.clock.call_later(0, self.notify_new_event)

    def search_users(self, search_term, limit):
        """Searches for users in directory

        Returns:
            dict of the form::

                {
                    "limited": <bool>,  # whether there were more results or not
                    "results": [  # Ordered by best match first
                        {
                            "user_id": <user_id>,
                            "display_name": <display_name>,
                            "avatar_url": <avatar_url>
                        }
                    ]
                }
        """
        return self.store.search_user_dir(search_term, limit)

    @defer.inlineCallbacks
    def notify_new_event(self):
        """Called when there may be more deltas to process
        """
        if self._is_processing:
            return

        self._is_processing = True
        try:
            yield self._unsafe_process()
        finally:
            self._is_processing = False

    @defer.inlineCallbacks
    def _unsafe_process(self):
        # If self.pos is None then means we haven't fetched it from DB
        if self.pos is None:
            self.pos = yield self.store.get_user_directory_stream_pos()

        # If still None then we need to do the initial fill of directory
        if self.pos is None:
            yield self._do_initial_spam()
            self.pos = yield self.store.get_user_directory_stream_pos()

        # Loop round handling deltas until we're up to date
        while True:
            with Measure(self.clock, "user_dir_delta"):
                deltas = yield self.store.get_current_state_deltas(self.pos)
                if not deltas:
                    return

                yield self._handle_deltas(deltas)

                self.pos = deltas[-1]["stream_id"]
                yield self.store.update_user_directory_stream_pos(self.pos)

    @defer.inlineCallbacks
    def _do_initial_spam(self):
        """Populates the user_directory from the current state of the DB, used
        when synapse first starts with user_directory support
        """
        new_pos = yield self.store.get_max_stream_id_in_current_state_deltas()

        # Delete any existing entries just in case there are any
        yield self.store.delete_all_from_user_dir()

        # We process by going through each existing room at a time.
        room_ids = yield self.store.get_all_rooms()

        logger.info("Doing initial update of user directory. %d rooms", len(room_ids))
        num_processed_rooms = 1

        for room_id in room_ids:
            logger.info("Handling room %d/%d", num_processed_rooms, len(room_ids))
            yield self._handle_intial_room(room_id)
            num_processed_rooms += 1

        logger.info("Processed all rooms.")

        self.initially_handled_users = None

        yield self.store.update_user_directory_stream_pos(new_pos)

    @defer.inlineCallbacks
    def _handle_intial_room(self, room_id):
        """Called when we initially fill out user_directory one room at a time
        """
        is_in_room = yield self.store.is_host_joined(room_id, self.server_name)
        if not is_in_room:
            return

        is_public = yield self.store.is_room_world_readable_or_publicly_joinable(room_id)

        users_with_profile = yield self.state.get_current_user_in_room(room_id)
        unhandled_users = set(users_with_profile) - self.initially_handled_users

        yield self.store.add_profiles_to_user_dir(
            room_id, {
                user_id: users_with_profile[user_id] for user_id in unhandled_users
            }
        )

        self.initially_handled_users |= unhandled_users

        if is_public:
            yield self.store.add_users_to_public_room(
                room_id,
                user_ids=unhandled_users - self.initially_handled_users_in_public
            )
            self.initially_handled_users_in_public != unhandled_users

    @defer.inlineCallbacks
    def _handle_deltas(self, deltas):
        """Called with the state deltas to process
        """
        for delta in deltas:
            typ = delta["type"]
            state_key = delta["state_key"]
            room_id = delta["room_id"]
            event_id = delta["event_id"]
            prev_event_id = delta["prev_event_id"]

            logger.debug("Handling: %r %r, %s", typ, state_key, event_id)

            # For join rule and visibility changes we need to check if the room
            # may have become public or not and add/remove the users in said room
            if typ in (EventTypes.RoomHistoryVisibility, EventTypes.JoinRules):
                yield self._handle_room_publicity_change(
                    room_id, prev_event_id, event_id, typ,
                )
            elif typ == EventTypes.Member:
                change = yield self._get_key_change(
                    prev_event_id, event_id,
                    key_name="membership",
                    public_value=Membership.JOIN,
                )

                if change is None:
                    # Handle any profile changes
                    yield self._handle_profile_change(
                        state_key, room_id, prev_event_id, event_id,
                    )
                    continue

                if not change:
                    # Need to check if the server left the room entirely, if so
                    # we might need to remove all the users in that room
                    is_in_room = yield self.store.is_host_joined(
                        room_id, self.server_name,
                    )
                    if not is_in_room:
                        logger.debug("Server left room: %r", room_id)
                        # Fetch all the users that we marked as being in user
                        # directory due to being in the room and then check if
                        # need to remove those users or not
                        user_ids = yield self.store.get_users_in_dir_due_to_room(room_id)
                        for user_id in user_ids:
                            yield self._handle_remove_user(room_id, user_id)
                        return
                    else:
                        logger.debug("Server is still in room: %r", room_id)

                if change:  # The user joined
                    event = yield self.store.get_event(event_id, allow_none=True)
                    profile = ProfileInfo(
                        avatar_url=event.content.get("avatar_url"),
                        display_name=event.content.get("displayname"),
                    )

                    yield self._handle_new_user(room_id, state_key, profile)
                else:  # The user left
                    yield self._handle_remove_user(room_id, state_key)
            else:
                logger.debug("Ignoring irrelevant type: %r", typ)

    @defer.inlineCallbacks
    def _handle_room_publicity_change(self, room_id, prev_event_id, event_id, typ):
        """Handle a room having potentially changed from/to world_readable/publically
        joinable.

        Args:
            room_id (str)
            prev_event_id (str|None): The previous event before the state change
            event_id (str|None): The new event after the state change
            typ (str): Type of the event
        """
        logger.debug("Handling change for %s", typ)

        if typ == EventTypes.RoomHistoryVisibility:
            change = yield self._get_key_change(
                prev_event_id, event_id,
                key_name="history_visibility",
                public_value="world_readable",
            )
        elif typ == EventTypes.JoinRules:
            change = yield self._get_key_change(
                prev_event_id, event_id,
                key_name="join_rule",
                public_value=JoinRules.PUBLIC,
            )
        else:
            raise Exception("Invalid event type")
        # If change is None, no change. True => become world_readable/public,
        # False => was world_readable/public
        if change is None:
            logger.debug("No change")
            return

        # There's been a change to or from being world readable.

        is_public = yield self.store.is_room_world_readable_or_publicly_joinable(
            room_id
        )

        logger.debug("Change: %r, is_public: %r", change, is_public)

        if change and not is_public:
            # If we became world readable but room isn't currently public then
            # we ignore the change
            return
        elif not change and is_public:
            # If we stopped being world readable but are still public,
            # ignore the change
            return

        if change:
            users_with_profile = yield self.state.get_current_user_in_room(room_id)
            for user_id, profile in users_with_profile.iteritems():
                yield self._handle_new_user(room_id, user_id, profile)
        else:
            users = yield self.store.get_users_in_public_due_to_room(room_id)
            for user_id in users:
                yield self._handle_remove_user(room_id, user_id)

    @defer.inlineCallbacks
    def _handle_new_user(self, room_id, user_id, profile):
        """Called when we might need to add user to directory

        Args:
            room_id (str): room_id that user joined or started being public that
            user_id (str)
        """
        logger.debug("Adding user to dir, %r", user_id)

        row = yield self.store.get_user_in_directory(user_id)
        if not row:
            yield self.store.add_profiles_to_user_dir(room_id, {user_id: profile})

        is_public = yield self.store.is_room_world_readable_or_publicly_joinable(
            room_id
        )

        if not is_public:
            return

        row = yield self.store.get_user_in_public_room(user_id)
        if not row:
            yield self.store.add_users_to_public_room(room_id, [user_id])

    @defer.inlineCallbacks
    def _handle_remove_user(self, room_id, user_id):
        """Called when we might need to remove user to directory

        Args:
            room_id (str): room_id that user left or stopped being public that
            user_id (str)
        """
        logger.debug("Maybe removing user %r", user_id)

        row = yield self.store.get_user_in_directory(user_id)
        update_user_dir = row and row["room_id"] == room_id

        row = yield self.store.get_user_in_public_room(user_id)
        update_user_in_public = row and row["room_id"] == room_id

        if not update_user_in_public and not update_user_dir:
            return

        # XXX: Make this faster?
        rooms = yield self.store.get_rooms_for_user(user_id)
        for j_room_id in rooms:
            if not update_user_in_public and not update_user_dir:
                break

            is_in_room = yield self.store.is_host_joined(
                j_room_id, self.server_name,
            )

            if not is_in_room:
                continue

            if update_user_dir:
                update_user_dir = False
                yield self.store.update_user_in_user_dir(user_id, j_room_id)

            if update_user_in_public:
                is_public = yield self.store.is_room_world_readable_or_publicly_joinable(
                    j_room_id
                )

                if is_public:
                    yield self.store.update_user_in_public_user_list(user_id, j_room_id)
                    update_user_in_public = False

        if update_user_dir:
            yield self.store.remove_from_user_dir(user_id)
        elif update_user_in_public:
            yield self.store.remove_from_user_in_public_room(user_id)

    @defer.inlineCallbacks
    def _handle_profile_change(self, user_id, room_id, prev_event_id, event_id):
        """Check member event changes for any profile changes and update the
        database if there are.
        """
        if not prev_event_id or not event_id:
            return

        prev_event = yield self.store.get_event(prev_event_id, allow_none=True)
        event = yield self.store.get_event(event_id, allow_none=True)

        if not prev_event or not event:
            return

        if event.membership != Membership.JOIN:
            return

        prev_name = prev_event.content.get("displayname")
        new_name = event.content.get("displayname")

        prev_avatar = prev_event.content.get("avatar_url")
        new_avatar = event.content.get("avatar_url")

        if prev_name != new_name or prev_avatar != new_avatar:
            yield self.store.update_profile_in_user_dir(
                user_id, new_name, new_avatar, room_id,
            )

    @defer.inlineCallbacks
    def _get_key_change(self, prev_event_id, event_id, key_name, public_value):
        """Given two events check if the `key_name` field in content changed
        from not matching `public_value` to doing so.

        For example, check if `history_visibility` (`key_name`) changed from
        `shared` to `world_readable` (`public_value`).

        Returns:
            None if the field in the events either both match `public_value`
            or if neither do, i.e. there has been no change.
            True if it didnt match `public_value` but now does
            False if it did match `public_value` but now doesn't
        """
        prev_event = None
        event = None
        if prev_event_id:
            prev_event = yield self.store.get_event(prev_event_id, allow_none=True)

        if event_id:
            event = yield self.store.get_event(event_id, allow_none=True)

        if not event and not prev_event:
            logger.debug("Neither event exists: %r %r", prev_event_id, event_id)
            defer.returnValue(None)

        prev_value = None
        value = None

        if prev_event:
            prev_value = prev_event.content.get(key_name)

        if event:
            value = event.content.get(key_name)

        logger.debug("prev_value: %r -> value: %r", prev_value, value)

        if value == public_value and prev_value != public_value:
            defer.returnValue(True)
        elif value != public_value and prev_value == public_value:
            defer.returnValue(False)
        else:
            defer.returnValue(None)