summaryrefslogtreecommitdiff
path: root/src/service/rooms/timeline/mod.rs
blob: 83c30101377457040c96a6fbd93e0d5d5ebf1c8c (plain)
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
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
mod data;

use std::{
    cmp::Ordering,
    collections::{BTreeMap, HashMap},
};

use std::{
    collections::HashSet,
    sync::{Arc, Mutex, RwLock},
};

pub use data::Data;
use regex::Regex;
use ruma::{
    api::{client::error::ErrorKind, federation},
    canonical_json::to_canonical_value,
    events::{
        push_rules::PushRulesEvent,
        room::{
            create::RoomCreateEventContent, encrypted::Relation, member::MembershipState,
            power_levels::RoomPowerLevelsEventContent,
        },
        GlobalAccountDataEventType, StateEventType, TimelineEventType,
    },
    push::{Action, Ruleset, Tweak},
    serde::Base64,
    state_res,
    state_res::{Event, RoomVersion},
    uint, user_id, CanonicalJsonObject, CanonicalJsonValue, EventId, OwnedEventId, OwnedRoomId,
    OwnedServerName, RoomAliasId, RoomId, ServerName, UserId,
};
use serde::Deserialize;
use serde_json::value::{to_raw_value, RawValue as RawJsonValue};
use tokio::sync::MutexGuard;
use tracing::{error, info, warn};

use crate::{
    api::server_server,
    service::pdu::{EventHash, PduBuilder},
    services, utils, Error, PduEvent, Result,
};

use super::state_compressor::CompressedStateEvent;

#[derive(Hash, PartialEq, Eq, Clone, Copy, Debug)]
pub enum PduCount {
    Backfilled(u64),
    Normal(u64),
}

impl PduCount {
    pub fn min() -> Self {
        Self::Backfilled(u64::MAX)
    }
    pub fn max() -> Self {
        Self::Normal(u64::MAX)
    }

    pub fn try_from_string(token: &str) -> Result<Self> {
        if token.starts_with('-') {
            token[1..].parse().map(PduCount::Backfilled)
        } else {
            token.parse().map(PduCount::Normal)
        }
        .map_err(|_| Error::BadRequest(ErrorKind::InvalidParam, "Invalid pagination token."))
    }

    pub fn stringify(&self) -> String {
        match self {
            PduCount::Backfilled(x) => format!("-{x}"),
            PduCount::Normal(x) => x.to_string(),
        }
    }
}

impl PartialOrd for PduCount {
    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
        Some(self.cmp(other))
    }
}

impl Ord for PduCount {
    fn cmp(&self, other: &Self) -> Ordering {
        match (self, other) {
            (PduCount::Normal(s), PduCount::Normal(o)) => s.cmp(o),
            (PduCount::Backfilled(s), PduCount::Backfilled(o)) => o.cmp(s),
            (PduCount::Normal(_), PduCount::Backfilled(_)) => Ordering::Greater,
            (PduCount::Backfilled(_), PduCount::Normal(_)) => Ordering::Less,
        }
    }
}
#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn comparisons() {
        assert!(PduCount::Normal(1) < PduCount::Normal(2));
        assert!(PduCount::Backfilled(2) < PduCount::Backfilled(1));
        assert!(PduCount::Normal(1) > PduCount::Backfilled(1));
        assert!(PduCount::Backfilled(1) < PduCount::Normal(1));
    }
}

pub struct Service {
    pub db: &'static dyn Data,

    pub lasttimelinecount_cache: Mutex<HashMap<OwnedRoomId, PduCount>>,
}

impl Service {
    #[tracing::instrument(skip(self))]
    pub fn first_pdu_in_room(&self, room_id: &RoomId) -> Result<Option<Arc<PduEvent>>> {
        self.all_pdus(&user_id!("@doesntmatter:conduit.rs"), &room_id)?
            .next()
            .map(|o| o.map(|(_, p)| Arc::new(p)))
            .transpose()
    }

    #[tracing::instrument(skip(self))]
    pub fn last_timeline_count(&self, sender_user: &UserId, room_id: &RoomId) -> Result<PduCount> {
        self.db.last_timeline_count(sender_user, room_id)
    }

    /// Returns the `count` of this pdu's id.
    pub fn get_pdu_count(&self, event_id: &EventId) -> Result<Option<PduCount>> {
        self.db.get_pdu_count(event_id)
    }

    // TODO Is this the same as the function above?
    /*
    #[tracing::instrument(skip(self))]
    pub fn latest_pdu_count(&self, room_id: &RoomId) -> Result<u64> {
        let prefix = self
            .get_shortroomid(room_id)?
            .expect("room exists")
            .to_be_bytes()
            .to_vec();

        let mut last_possible_key = prefix.clone();
        last_possible_key.extend_from_slice(&u64::MAX.to_be_bytes());

        self.pduid_pdu
            .iter_from(&last_possible_key, true)
            .take_while(move |(k, _)| k.starts_with(&prefix))
            .next()
            .map(|b| self.pdu_count(&b.0))
            .transpose()
            .map(|op| op.unwrap_or_default())
    }
    */

    /// Returns the json of a pdu.
    pub fn get_pdu_json(&self, event_id: &EventId) -> Result<Option<CanonicalJsonObject>> {
        self.db.get_pdu_json(event_id)
    }

    /// Returns the json of a pdu.
    pub fn get_non_outlier_pdu_json(
        &self,
        event_id: &EventId,
    ) -> Result<Option<CanonicalJsonObject>> {
        self.db.get_non_outlier_pdu_json(event_id)
    }

    /// Returns the pdu's id.
    pub fn get_pdu_id(&self, event_id: &EventId) -> Result<Option<Vec<u8>>> {
        self.db.get_pdu_id(event_id)
    }

    /// Returns the pdu.
    ///
    /// Checks the `eventid_outlierpdu` Tree if not found in the timeline.
    pub fn get_non_outlier_pdu(&self, event_id: &EventId) -> Result<Option<PduEvent>> {
        self.db.get_non_outlier_pdu(event_id)
    }

    /// Returns the pdu.
    ///
    /// Checks the `eventid_outlierpdu` Tree if not found in the timeline.
    pub fn get_pdu(&self, event_id: &EventId) -> Result<Option<Arc<PduEvent>>> {
        self.db.get_pdu(event_id)
    }

    /// Returns the pdu.
    ///
    /// This does __NOT__ check the outliers `Tree`.
    pub fn get_pdu_from_id(&self, pdu_id: &[u8]) -> Result<Option<PduEvent>> {
        self.db.get_pdu_from_id(pdu_id)
    }

    /// Returns the pdu as a `BTreeMap<String, CanonicalJsonValue>`.
    pub fn get_pdu_json_from_id(&self, pdu_id: &[u8]) -> Result<Option<CanonicalJsonObject>> {
        self.db.get_pdu_json_from_id(pdu_id)
    }

    /// Removes a pdu and creates a new one with the same id.
    #[tracing::instrument(skip(self))]
    pub fn replace_pdu(
        &self,
        pdu_id: &[u8],
        pdu_json: &CanonicalJsonObject,
        pdu: &PduEvent,
    ) -> Result<()> {
        self.db.replace_pdu(pdu_id, pdu_json, pdu)
    }

    /// Creates a new persisted data unit and adds it to a room.
    ///
    /// By this point the incoming event should be fully authenticated, no auth happens
    /// in `append_pdu`.
    ///
    /// Returns pdu id
    #[tracing::instrument(skip(self, pdu, pdu_json, leaves))]
    pub fn append_pdu<'a>(
        &self,
        pdu: &PduEvent,
        mut pdu_json: CanonicalJsonObject,
        leaves: Vec<OwnedEventId>,
        state_lock: &MutexGuard<'_, ()>, // Take mutex guard to make sure users get the room state mutex
    ) -> Result<Vec<u8>> {
        let shortroomid = services()
            .rooms
            .short
            .get_shortroomid(&pdu.room_id)?
            .expect("room exists");

        // Make unsigned fields correct. This is not properly documented in the spec, but state
        // events need to have previous content in the unsigned field, so clients can easily
        // interpret things like membership changes
        if let Some(state_key) = &pdu.state_key {
            if let CanonicalJsonValue::Object(unsigned) = pdu_json
                .entry("unsigned".to_owned())
                .or_insert_with(|| CanonicalJsonValue::Object(Default::default()))
            {
                if let Some(shortstatehash) = services()
                    .rooms
                    .state_accessor
                    .pdu_shortstatehash(&pdu.event_id)
                    .unwrap()
                {
                    if let Some(prev_state) = services()
                        .rooms
                        .state_accessor
                        .state_get(shortstatehash, &pdu.kind.to_string().into(), state_key)
                        .unwrap()
                    {
                        unsigned.insert(
                            "prev_content".to_owned(),
                            CanonicalJsonValue::Object(
                                utils::to_canonical_object(prev_state.content.clone())
                                    .expect("event is valid, we just created it"),
                            ),
                        );
                    }
                }
            } else {
                error!("Invalid unsigned type in pdu.");
            }
        }

        // We must keep track of all events that have been referenced.
        services()
            .rooms
            .pdu_metadata
            .mark_as_referenced(&pdu.room_id, &pdu.prev_events)?;
        services()
            .rooms
            .state
            .set_forward_extremities(&pdu.room_id, leaves, state_lock)?;

        let mutex_insert = Arc::clone(
            services()
                .globals
                .roomid_mutex_insert
                .write()
                .unwrap()
                .entry(pdu.room_id.clone())
                .or_default(),
        );
        let insert_lock = mutex_insert.lock().unwrap();

        let count1 = services().globals.next_count()?;
        // Mark as read first so the sending client doesn't get a notification even if appending
        // fails
        services()
            .rooms
            .edus
            .read_receipt
            .private_read_set(&pdu.room_id, &pdu.sender, count1)?;
        services()
            .rooms
            .user
            .reset_notification_counts(&pdu.sender, &pdu.room_id)?;

        let count2 = services().globals.next_count()?;
        let mut pdu_id = shortroomid.to_be_bytes().to_vec();
        pdu_id.extend_from_slice(&count2.to_be_bytes());

        // Insert pdu
        self.db.append_pdu(&pdu_id, pdu, &pdu_json, count2)?;

        drop(insert_lock);

        // See if the event matches any known pushers
        let power_levels: RoomPowerLevelsEventContent = services()
            .rooms
            .state_accessor
            .room_state_get(&pdu.room_id, &StateEventType::RoomPowerLevels, "")?
            .map(|ev| {
                serde_json::from_str(ev.content.get())
                    .map_err(|_| Error::bad_database("invalid m.room.power_levels event"))
            })
            .transpose()?
            .unwrap_or_default();

        let sync_pdu = pdu.to_sync_room_event();

        let mut notifies = Vec::new();
        let mut highlights = Vec::new();

        for user in services()
            .rooms
            .state_cache
            .get_our_real_users(&pdu.room_id)?
            .iter()
        {
            // Don't notify the user of their own events
            if user == &pdu.sender {
                continue;
            }

            let rules_for_user = services()
                .account_data
                .get(
                    None,
                    user,
                    GlobalAccountDataEventType::PushRules.to_string().into(),
                )?
                .map(|event| {
                    serde_json::from_str::<PushRulesEvent>(event.get())
                        .map_err(|_| Error::bad_database("Invalid push rules event in db."))
                })
                .transpose()?
                .map(|ev: PushRulesEvent| ev.content.global)
                .unwrap_or_else(|| Ruleset::server_default(user));

            let mut highlight = false;
            let mut notify = false;

            for action in services().pusher.get_actions(
                user,
                &rules_for_user,
                &power_levels,
                &sync_pdu,
                &pdu.room_id,
            )? {
                match action {
                    Action::Notify => notify = true,
                    Action::SetTweak(Tweak::Highlight(true)) => {
                        highlight = true;
                    }
                    _ => {}
                };
            }

            if notify {
                notifies.push(user.clone());
            }

            if highlight {
                highlights.push(user.clone());
            }

            for push_key in services().pusher.get_pushkeys(user) {
                services().sending.send_push_pdu(&pdu_id, user, push_key?)?;
            }
        }

        self.db
            .increment_notification_counts(&pdu.room_id, notifies, highlights)?;

        match pdu.kind {
            TimelineEventType::RoomRedaction => {
                if let Some(redact_id) = &pdu.redacts {
                    self.redact_pdu(redact_id, pdu)?;
                }
            }
            TimelineEventType::SpaceChild => {
                if let Some(_state_key) = &pdu.state_key {
                    services()
                        .rooms
                        .spaces
                        .roomid_spacechunk_cache
                        .lock()
                        .unwrap()
                        .remove(&pdu.room_id);
                }
            }
            TimelineEventType::RoomMember => {
                if let Some(state_key) = &pdu.state_key {
                    #[derive(Deserialize)]
                    struct ExtractMembership {
                        membership: MembershipState,
                    }

                    // if the state_key fails
                    let target_user_id = UserId::parse(state_key.clone())
                        .expect("This state_key was previously validated");

                    let content = serde_json::from_str::<ExtractMembership>(pdu.content.get())
                        .map_err(|_| Error::bad_database("Invalid content in pdu."))?;

                    let invite_state = match content.membership {
                        MembershipState::Invite => {
                            let state = services().rooms.state.calculate_invite_state(pdu)?;
                            Some(state)
                        }
                        _ => None,
                    };

                    // Update our membership info, we do this here incase a user is invited
                    // and immediately leaves we need the DB to record the invite event for auth
                    services().rooms.state_cache.update_membership(
                        &pdu.room_id,
                        &target_user_id,
                        content.membership,
                        &pdu.sender,
                        invite_state,
                        true,
                    )?;
                }
            }
            TimelineEventType::RoomMessage => {
                #[derive(Deserialize)]
                struct ExtractBody {
                    body: Option<String>,
                }

                let content = serde_json::from_str::<ExtractBody>(pdu.content.get())
                    .map_err(|_| Error::bad_database("Invalid content in pdu."))?;

                if let Some(body) = content.body {
                    services()
                        .rooms
                        .search
                        .index_pdu(shortroomid, &pdu_id, &body)?;

                    let admin_room = services().rooms.alias.resolve_local_alias(
                        <&RoomAliasId>::try_from(
                            format!("#admins:{}", services().globals.server_name()).as_str(),
                        )
                        .expect("#admins:server_name is a valid room alias"),
                    )?;
                    let server_user = format!("@conduit:{}", services().globals.server_name());

                    let to_conduit = body.starts_with(&format!("{server_user}: "))
                        || body.starts_with(&format!("{server_user} "));

                    // This will evaluate to false if the emergency password is set up so that
                    // the administrator can execute commands as conduit
                    let from_conduit = pdu.sender == server_user
                        && services().globals.emergency_password().is_none();

                    if to_conduit && !from_conduit && admin_room.as_ref() == Some(&pdu.room_id) {
                        services().admin.process_message(body);
                    }
                }
            }
            _ => {}
        }

        // Update Relationships
        #[derive(Deserialize)]
        struct ExtractRelatesTo {
            #[serde(rename = "m.relates_to")]
            relates_to: Relation,
        }

        #[derive(Clone, Debug, Deserialize)]
        struct ExtractEventId {
            event_id: OwnedEventId,
        }
        #[derive(Clone, Debug, Deserialize)]
        struct ExtractRelatesToEventId {
            #[serde(rename = "m.relates_to")]
            relates_to: ExtractEventId,
        }

        if let Ok(content) = serde_json::from_str::<ExtractRelatesToEventId>(pdu.content.get()) {
            if let Some(related_pducount) = services()
                .rooms
                .timeline
                .get_pdu_count(&content.relates_to.event_id)?
            {
                services()
                    .rooms
                    .pdu_metadata
                    .add_relation(PduCount::Normal(count2), related_pducount)?;
            }
        }

        if let Ok(content) = serde_json::from_str::<ExtractRelatesTo>(pdu.content.get()) {
            match content.relates_to {
                Relation::Reply { in_reply_to } => {
                    // We need to do it again here, because replies don't have
                    // event_id as a top level field
                    if let Some(related_pducount) = services()
                        .rooms
                        .timeline
                        .get_pdu_count(&in_reply_to.event_id)?
                    {
                        services()
                            .rooms
                            .pdu_metadata
                            .add_relation(PduCount::Normal(count2), related_pducount)?;
                    }
                }
                Relation::Thread(thread) => {
                    services()
                        .rooms
                        .threads
                        .add_to_thread(&thread.event_id, pdu)?;
                }
                _ => {} // TODO: Aggregate other types
            }
        }

        for appservice in services().appservice.all()? {
            if services()
                .rooms
                .state_cache
                .appservice_in_room(&pdu.room_id, &appservice)?
            {
                services()
                    .sending
                    .send_pdu_appservice(appservice.0, pdu_id.clone())?;
                continue;
            }

            // If the RoomMember event has a non-empty state_key, it is targeted at someone.
            // If it is our appservice user, we send this PDU to it.
            if pdu.kind == TimelineEventType::RoomMember {
                if let Some(state_key_uid) = &pdu
                    .state_key
                    .as_ref()
                    .and_then(|state_key| UserId::parse(state_key.as_str()).ok())
                {
                    if let Some(appservice_uid) = appservice
                        .1
                        .get("sender_localpart")
                        .and_then(|string| string.as_str())
                        .and_then(|string| {
                            UserId::parse_with_server_name(string, services().globals.server_name())
                                .ok()
                        })
                    {
                        if state_key_uid == &appservice_uid {
                            services()
                                .sending
                                .send_pdu_appservice(appservice.0, pdu_id.clone())?;
                            continue;
                        }
                    }
                }
            }

            if let Some(namespaces) = appservice.1.get("namespaces") {
                let users = namespaces
                    .get("users")
                    .and_then(|users| users.as_sequence())
                    .map_or_else(Vec::new, |users| {
                        users
                            .iter()
                            .filter_map(|users| Regex::new(users.get("regex")?.as_str()?).ok())
                            .collect::<Vec<_>>()
                    });
                let aliases = namespaces
                    .get("aliases")
                    .and_then(|aliases| aliases.as_sequence())
                    .map_or_else(Vec::new, |aliases| {
                        aliases
                            .iter()
                            .filter_map(|aliases| Regex::new(aliases.get("regex")?.as_str()?).ok())
                            .collect::<Vec<_>>()
                    });
                let rooms = namespaces
                    .get("rooms")
                    .and_then(|rooms| rooms.as_sequence());

                let matching_users = |users: &Regex| {
                    users.is_match(pdu.sender.as_str())
                        || pdu.kind == TimelineEventType::RoomMember
                            && pdu
                                .state_key
                                .as_ref()
                                .map_or(false, |state_key| users.is_match(state_key))
                };
                let matching_aliases = |aliases: &Regex| {
                    services()
                        .rooms
                        .alias
                        .local_aliases_for_room(&pdu.room_id)
                        .filter_map(|r| r.ok())
                        .any(|room_alias| aliases.is_match(room_alias.as_str()))
                };

                if aliases.iter().any(matching_aliases)
                    || rooms.map_or(false, |rooms| rooms.contains(&pdu.room_id.as_str().into()))
                    || users.iter().any(matching_users)
                {
                    services()
                        .sending
                        .send_pdu_appservice(appservice.0, pdu_id.clone())?;
                }
            }
        }

        Ok(pdu_id)
    }

    pub fn create_hash_and_sign_event(
        &self,
        pdu_builder: PduBuilder,
        sender: &UserId,
        room_id: &RoomId,
        _mutex_lock: &MutexGuard<'_, ()>, // Take mutex guard to make sure users get the room state mutex
    ) -> Result<(PduEvent, CanonicalJsonObject)> {
        let PduBuilder {
            event_type,
            content,
            unsigned,
            state_key,
            redacts,
        } = pdu_builder;

        let prev_events: Vec<_> = services()
            .rooms
            .state
            .get_forward_extremities(room_id)?
            .into_iter()
            .take(20)
            .collect();

        let create_event = services().rooms.state_accessor.room_state_get(
            room_id,
            &StateEventType::RoomCreate,
            "",
        )?;

        let create_event_content: Option<RoomCreateEventContent> = create_event
            .as_ref()
            .map(|create_event| {
                serde_json::from_str(create_event.content.get()).map_err(|e| {
                    warn!("Invalid create event: {}", e);
                    Error::bad_database("Invalid create event in db.")
                })
            })
            .transpose()?;

        // If there was no create event yet, assume we are creating a room with the default
        // version right now
        let room_version_id = create_event_content
            .map_or(services().globals.default_room_version(), |create_event| {
                create_event.room_version
            });
        let room_version = RoomVersion::new(&room_version_id).expect("room version is supported");

        let auth_events = services().rooms.state.get_auth_events(
            room_id,
            &event_type,
            sender,
            state_key.as_deref(),
            &content,
        )?;

        // Our depth is the maximum depth of prev_events + 1
        let depth = prev_events
            .iter()
            .filter_map(|event_id| Some(services().rooms.timeline.get_pdu(event_id).ok()??.depth))
            .max()
            .unwrap_or_else(|| uint!(0))
            + uint!(1);

        let mut unsigned = unsigned.unwrap_or_default();

        if let Some(state_key) = &state_key {
            if let Some(prev_pdu) = services().rooms.state_accessor.room_state_get(
                room_id,
                &event_type.to_string().into(),
                state_key,
            )? {
                unsigned.insert(
                    "prev_content".to_owned(),
                    serde_json::from_str(prev_pdu.content.get()).expect("string is valid json"),
                );
                unsigned.insert(
                    "prev_sender".to_owned(),
                    serde_json::to_value(&prev_pdu.sender).expect("UserId::to_value always works"),
                );
            }
        }

        let mut pdu = PduEvent {
            event_id: ruma::event_id!("$thiswillbefilledinlater").into(),
            room_id: room_id.to_owned(),
            sender: sender.to_owned(),
            origin_server_ts: utils::millis_since_unix_epoch()
                .try_into()
                .expect("time is valid"),
            kind: event_type,
            content,
            state_key,
            prev_events,
            depth,
            auth_events: auth_events
                .values()
                .map(|pdu| pdu.event_id.clone())
                .collect(),
            redacts,
            unsigned: if unsigned.is_empty() {
                None
            } else {
                Some(to_raw_value(&unsigned).expect("to_raw_value always works"))
            },
            hashes: EventHash {
                sha256: "aaa".to_owned(),
            },
            signatures: None,
        };

        let auth_check = state_res::auth_check(
            &room_version,
            &pdu,
            None::<PduEvent>, // TODO: third_party_invite
            |k, s| auth_events.get(&(k.clone(), s.to_owned())),
        )
        .map_err(|e| {
            error!("{:?}", e);
            Error::bad_database("Auth check failed.")
        })?;

        if !auth_check {
            return Err(Error::BadRequest(
                ErrorKind::Forbidden,
                "Event is not authorized.",
            ));
        }

        // Hash and sign
        let mut pdu_json =
            utils::to_canonical_object(&pdu).expect("event is valid, we just created it");

        pdu_json.remove("event_id");

        // Add origin because synapse likes that (and it's required in the spec)
        pdu_json.insert(
            "origin".to_owned(),
            to_canonical_value(services().globals.server_name())
                .expect("server name is a valid CanonicalJsonValue"),
        );

        match ruma::signatures::hash_and_sign_event(
            services().globals.server_name().as_str(),
            services().globals.keypair(),
            &mut pdu_json,
            &room_version_id,
        ) {
            Ok(_) => {}
            Err(e) => {
                return match e {
                    ruma::signatures::Error::PduSize => Err(Error::BadRequest(
                        ErrorKind::TooLarge,
                        "Message is too long",
                    )),
                    _ => Err(Error::BadRequest(
                        ErrorKind::Unknown,
                        "Signing event failed",
                    )),
                }
            }
        }

        // Generate event id
        pdu.event_id = EventId::parse_arc(format!(
            "${}",
            ruma::signatures::reference_hash(&pdu_json, &room_version_id)
                .expect("ruma can calculate reference hashes")
        ))
        .expect("ruma's reference hashes are valid event ids");

        pdu_json.insert(
            "event_id".to_owned(),
            CanonicalJsonValue::String(pdu.event_id.as_str().to_owned()),
        );

        // Generate short event id
        let _shorteventid = services()
            .rooms
            .short
            .get_or_create_shorteventid(&pdu.event_id)?;

        Ok((pdu, pdu_json))
    }

    /// Creates a new persisted data unit and adds it to a room. This function takes a
    /// roomid_mutex_state, meaning that only this function is able to mutate the room state.
    #[tracing::instrument(skip(self, state_lock))]
    pub fn build_and_append_pdu(
        &self,
        pdu_builder: PduBuilder,
        sender: &UserId,
        room_id: &RoomId,
        state_lock: &MutexGuard<'_, ()>, // Take mutex guard to make sure users get the room state mutex
    ) -> Result<Arc<EventId>> {
        let (pdu, pdu_json) =
            self.create_hash_and_sign_event(pdu_builder, sender, room_id, state_lock)?;

        let admin_room = services().rooms.alias.resolve_local_alias(
            <&RoomAliasId>::try_from(
                format!("#admins:{}", services().globals.server_name()).as_str(),
            )
            .expect("#admins:server_name is a valid room alias"),
        )?;
        if admin_room.filter(|v| v == room_id).is_some() {
            match pdu.event_type() {
                TimelineEventType::RoomEncryption => {
                    warn!("Encryption is not allowed in the admins room");
                    return Err(Error::BadRequest(
                        ErrorKind::Forbidden,
                        "Encryption is not allowed in the admins room.",
                    ));
                }
                TimelineEventType::RoomMember => {
                    #[derive(Deserialize)]
                    struct ExtractMembership {
                        membership: MembershipState,
                    }

                    let target = pdu
                        .state_key()
                        .filter(|v| v.starts_with("@"))
                        .unwrap_or(sender.as_str());
                    let server_name = services().globals.server_name();
                    let server_user = format!("@conduit:{}", server_name);
                    let content = serde_json::from_str::<ExtractMembership>(pdu.content.get())
                        .map_err(|_| Error::bad_database("Invalid content in pdu."))?;

                    if content.membership == MembershipState::Leave {
                        if target == &server_user {
                            warn!("Conduit user cannot leave from admins room");
                            return Err(Error::BadRequest(
                                ErrorKind::Forbidden,
                                "Conduit user cannot leave from admins room.",
                            ));
                        }

                        let count = services()
                            .rooms
                            .state_cache
                            .room_members(room_id)
                            .filter_map(|m| m.ok())
                            .filter(|m| m.server_name() == server_name)
                            .filter(|m| m != target)
                            .count();
                        if count < 2 {
                            warn!("Last admin cannot leave from admins room");
                            return Err(Error::BadRequest(
                                ErrorKind::Forbidden,
                                "Last admin cannot leave from admins room.",
                            ));
                        }
                    }

                    if content.membership == MembershipState::Ban && pdu.state_key().is_some() {
                        if target == &server_user {
                            warn!("Conduit user cannot be banned in admins room");
                            return Err(Error::BadRequest(
                                ErrorKind::Forbidden,
                                "Conduit user cannot be banned in admins room.",
                            ));
                        }

                        let count = services()
                            .rooms
                            .state_cache
                            .room_members(room_id)
                            .filter_map(|m| m.ok())
                            .filter(|m| m.server_name() == server_name)
                            .filter(|m| m != target)
                            .count();
                        if count < 2 {
                            warn!("Last admin cannot be banned in admins room");
                            return Err(Error::BadRequest(
                                ErrorKind::Forbidden,
                                "Last admin cannot be banned in admins room.",
                            ));
                        }
                    }
                }
                _ => {}
            }
        }

        // We append to state before appending the pdu, so we don't have a moment in time with the
        // pdu without it's state. This is okay because append_pdu can't fail.
        let statehashid = services().rooms.state.append_to_state(&pdu)?;

        let pdu_id = self.append_pdu(
            &pdu,
            pdu_json,
            // Since this PDU references all pdu_leaves we can update the leaves
            // of the room
            vec![(*pdu.event_id).to_owned()],
            state_lock,
        )?;

        // We set the room state after inserting the pdu, so that we never have a moment in time
        // where events in the current room state do not exist
        services()
            .rooms
            .state
            .set_room_state(room_id, statehashid, state_lock)?;

        let mut servers: HashSet<OwnedServerName> = services()
            .rooms
            .state_cache
            .room_servers(room_id)
            .filter_map(|r| r.ok())
            .collect();

        // In case we are kicking or banning a user, we need to inform their server of the change
        if pdu.kind == TimelineEventType::RoomMember {
            if let Some(state_key_uid) = &pdu
                .state_key
                .as_ref()
                .and_then(|state_key| UserId::parse(state_key.as_str()).ok())
            {
                servers.insert(state_key_uid.server_name().to_owned());
            }
        }

        // Remove our server from the server list since it will be added to it by room_servers() and/or the if statement above
        servers.remove(services().globals.server_name());

        services().sending.send_pdu(servers.into_iter(), &pdu_id)?;

        Ok(pdu.event_id)
    }

    /// Append the incoming event setting the state snapshot to the state from the
    /// server that sent the event.
    #[tracing::instrument(skip_all)]
    pub fn append_incoming_pdu<'a>(
        &self,
        pdu: &PduEvent,
        pdu_json: CanonicalJsonObject,
        new_room_leaves: Vec<OwnedEventId>,
        state_ids_compressed: Arc<HashSet<CompressedStateEvent>>,
        soft_fail: bool,
        state_lock: &MutexGuard<'_, ()>, // Take mutex guard to make sure users get the room state mutex
    ) -> Result<Option<Vec<u8>>> {
        // We append to state before appending the pdu, so we don't have a moment in time with the
        // pdu without it's state. This is okay because append_pdu can't fail.
        services().rooms.state.set_event_state(
            &pdu.event_id,
            &pdu.room_id,
            state_ids_compressed,
        )?;

        if soft_fail {
            services()
                .rooms
                .pdu_metadata
                .mark_as_referenced(&pdu.room_id, &pdu.prev_events)?;
            services().rooms.state.set_forward_extremities(
                &pdu.room_id,
                new_room_leaves,
                state_lock,
            )?;
            return Ok(None);
        }

        let pdu_id =
            services()
                .rooms
                .timeline
                .append_pdu(pdu, pdu_json, new_room_leaves, state_lock)?;

        Ok(Some(pdu_id))
    }

    /// Returns an iterator over all PDUs in a room.
    pub fn all_pdus<'a>(
        &'a self,
        user_id: &UserId,
        room_id: &RoomId,
    ) -> Result<impl Iterator<Item = Result<(PduCount, PduEvent)>> + 'a> {
        self.pdus_after(user_id, room_id, PduCount::min())
    }

    /// Returns an iterator over all events and their tokens in a room that happened before the
    /// event with id `until` in reverse-chronological order.
    #[tracing::instrument(skip(self))]
    pub fn pdus_until<'a>(
        &'a self,
        user_id: &UserId,
        room_id: &RoomId,
        until: PduCount,
    ) -> Result<impl Iterator<Item = Result<(PduCount, PduEvent)>> + 'a> {
        self.db.pdus_until(user_id, room_id, until)
    }

    /// Returns an iterator over all events and their token in a room that happened after the event
    /// with id `from` in chronological order.
    #[tracing::instrument(skip(self))]
    pub fn pdus_after<'a>(
        &'a self,
        user_id: &UserId,
        room_id: &RoomId,
        from: PduCount,
    ) -> Result<impl Iterator<Item = Result<(PduCount, PduEvent)>> + 'a> {
        self.db.pdus_after(user_id, room_id, from)
    }

    /// Replace a PDU with the redacted form.
    #[tracing::instrument(skip(self, reason))]
    pub fn redact_pdu(&self, event_id: &EventId, reason: &PduEvent) -> Result<()> {
        // TODO: Don't reserialize, keep original json
        if let Some(pdu_id) = self.get_pdu_id(event_id)? {
            let mut pdu = self
                .get_pdu_from_id(&pdu_id)?
                .ok_or_else(|| Error::bad_database("PDU ID points to invalid PDU."))?;
            pdu.redact(reason)?;
            self.replace_pdu(
                &pdu_id,
                &utils::to_canonical_object(&pdu).expect("PDU is an object"),
                &pdu,
            )?;
        }
        // If event does not exist, just noop
        Ok(())
    }

    #[tracing::instrument(skip(self, room_id))]
    pub async fn backfill_if_required(&self, room_id: &RoomId, from: PduCount) -> Result<()> {
        let first_pdu = self
            .all_pdus(&user_id!("@doesntmatter:conduit.rs"), &room_id)?
            .next()
            .expect("Room is not empty")?;

        if first_pdu.0 < from {
            // No backfill required, there are still events between them
            return Ok(());
        }

        let power_levels: RoomPowerLevelsEventContent = services()
            .rooms
            .state_accessor
            .room_state_get(&room_id, &StateEventType::RoomPowerLevels, "")?
            .map(|ev| {
                serde_json::from_str(ev.content.get())
                    .map_err(|_| Error::bad_database("invalid m.room.power_levels event"))
            })
            .transpose()?
            .unwrap_or_default();
        let mut admin_servers = power_levels
            .users
            .iter()
            .filter(|(_, level)| **level > power_levels.users_default)
            .map(|(user_id, _)| user_id.server_name())
            .collect::<HashSet<_>>();
        admin_servers.remove(services().globals.server_name());

        // Request backfill
        for backfill_server in admin_servers {
            info!("Asking {backfill_server} for backfill");
            let response = services()
                .sending
                .send_federation_request(
                    backfill_server,
                    federation::backfill::get_backfill::v1::Request {
                        room_id: room_id.to_owned(),
                        v: vec![first_pdu.1.event_id.as_ref().to_owned()],
                        limit: uint!(100),
                    },
                )
                .await;
            match response {
                Ok(response) => {
                    let mut pub_key_map = RwLock::new(BTreeMap::new());
                    for pdu in response.pdus {
                        if let Err(e) = self
                            .backfill_pdu(backfill_server, pdu, &mut pub_key_map)
                            .await
                        {
                            warn!("Failed to add backfilled pdu: {e}");
                        }
                    }
                    return Ok(());
                }
                Err(e) => {
                    warn!("{backfill_server} could not provide backfill: {e}");
                }
            }
        }

        info!("No servers could backfill");
        Ok(())
    }

    #[tracing::instrument(skip(self, pdu))]
    pub async fn backfill_pdu(
        &self,
        origin: &ServerName,
        pdu: Box<RawJsonValue>,
        pub_key_map: &RwLock<BTreeMap<String, BTreeMap<String, Base64>>>,
    ) -> Result<()> {
        let (event_id, value, room_id) = server_server::parse_incoming_pdu(&pdu)?;

        // Lock so we cannot backfill the same pdu twice at the same time
        let mutex = Arc::clone(
            services()
                .globals
                .roomid_mutex_federation
                .write()
                .unwrap()
                .entry(room_id.to_owned())
                .or_default(),
        );
        let mutex_lock = mutex.lock().await;

        // Skip the PDU if we already have it as a timeline event
        if let Some(pdu_id) = services().rooms.timeline.get_pdu_id(&event_id)? {
            info!("We already know {event_id} at {pdu_id:?}");
            return Ok(());
        }

        services()
            .rooms
            .event_handler
            .handle_incoming_pdu(origin, &event_id, &room_id, value, false, &pub_key_map)
            .await?;

        let value = self.get_pdu_json(&event_id)?.expect("We just created it");
        let pdu = self.get_pdu(&event_id)?.expect("We just created it");

        let shortroomid = services()
            .rooms
            .short
            .get_shortroomid(&room_id)?
            .expect("room exists");

        let mutex_insert = Arc::clone(
            services()
                .globals
                .roomid_mutex_insert
                .write()
                .unwrap()
                .entry(room_id.clone())
                .or_default(),
        );
        let insert_lock = mutex_insert.lock().unwrap();

        let count = services().globals.next_count()?;
        let mut pdu_id = shortroomid.to_be_bytes().to_vec();
        pdu_id.extend_from_slice(&0_u64.to_be_bytes());
        pdu_id.extend_from_slice(&(u64::MAX - count).to_be_bytes());

        // Insert pdu
        self.db.prepend_backfill_pdu(&pdu_id, &event_id, &value)?;

        drop(insert_lock);

        match pdu.kind {
            TimelineEventType::RoomMessage => {
                #[derive(Deserialize)]
                struct ExtractBody {
                    body: Option<String>,
                }

                let content = serde_json::from_str::<ExtractBody>(pdu.content.get())
                    .map_err(|_| Error::bad_database("Invalid content in pdu."))?;

                if let Some(body) = content.body {
                    services()
                        .rooms
                        .search
                        .index_pdu(shortroomid, &pdu_id, &body)?;
                }
            }
            _ => {}
        }
        drop(mutex_lock);

        info!("Prepended backfill pdu");
        Ok(())
    }
}