summaryrefslogtreecommitdiffstats
path: root/dom/fetch/FetchDriver.cpp
blob: 9fca1de608ec61607dcf2c137a088a4c8453fe13 (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
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "js/Value.h"
#include "mozilla/DebugOnly.h"
#include "mozilla/TaskQueue.h"
#include "mozilla/dom/FetchDriver.h"

#include "mozilla/dom/ReferrerInfo.h"
#include "nsIAsyncVerifyRedirectCallback.h"
#include "mozilla/dom/Document.h"
#include "nsICookieJarSettings.h"
#include "nsIFile.h"
#include "nsIInputStream.h"
#include "nsIInterceptionInfo.h"
#include "nsIOutputStream.h"
#include "nsIFileChannel.h"
#include "nsIHttpChannel.h"
#include "nsIHttpChannelInternal.h"
#include "nsISupportsPriority.h"
#include "nsIThreadRetargetableRequest.h"
#include "nsIUploadChannel2.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsIPipe.h"
#include "nsIRedirectHistoryEntry.h"

#include "nsContentPolicyUtils.h"
#include "nsDataHandler.h"
#include "nsNetUtil.h"
#include "nsPrintfCString.h"
#include "nsProxyRelease.h"
#include "nsStreamUtils.h"
#include "nsStringStream.h"
#include "nsHttpChannel.h"

#include "mozilla/dom/BlobURLProtocolHandler.h"
#include "mozilla/dom/File.h"
#include "mozilla/dom/PerformanceStorage.h"
#include "mozilla/dom/PerformanceTiming.h"
#include "mozilla/dom/ServiceWorkerInterceptController.h"
#include "mozilla/dom/UserActivation.h"
#include "mozilla/dom/WorkerCommon.h"
#include "mozilla/PreloaderBase.h"
#include "mozilla/net/InterceptionInfo.h"
#include "mozilla/net/NeckoChannelParams.h"
#include "mozilla/ipc/PBackgroundSharedTypes.h"
#include "mozilla/StaticPrefs_browser.h"
#include "mozilla/StaticPrefs_network.h"
#include "mozilla/StaticPrefs_privacy.h"
#include "mozilla/StaticPrefs_javascript.h"
#include "mozilla/Unused.h"

#include "Fetch.h"
#include "FetchUtil.h"
#include "InternalRequest.h"
#include "InternalResponse.h"

namespace mozilla::dom {

namespace {

void GetBlobURISpecFromChannel(nsIRequest* aRequest, nsCString& aBlobURISpec) {
  MOZ_ASSERT(aRequest);

  aBlobURISpec.SetIsVoid(true);

  nsCOMPtr<nsIChannel> channel = do_QueryInterface(aRequest);
  if (!channel) {
    return;
  }

  nsCOMPtr<nsIURI> uri;
  nsresult rv = NS_GetFinalChannelURI(channel, getter_AddRefs(uri));
  if (NS_FAILED(rv)) {
    return;
  }

  if (!dom::IsBlobURI(uri)) {
    return;
  }

  uri->GetSpec(aBlobURISpec);
}

bool ShouldCheckSRI(const InternalRequest& aRequest,
                    const InternalResponse& aResponse) {
  return !aRequest.GetIntegrity().IsEmpty() &&
         aResponse.Type() != ResponseType::Error;
}

}  // anonymous namespace

//-----------------------------------------------------------------------------
// AlternativeDataStreamListener
//-----------------------------------------------------------------------------
class AlternativeDataStreamListener final
    : public nsIStreamListener,
      public nsIThreadRetargetableStreamListener {
 public:
  NS_DECL_THREADSAFE_ISUPPORTS
  NS_DECL_NSIREQUESTOBSERVER
  NS_DECL_NSISTREAMLISTENER
  NS_DECL_NSITHREADRETARGETABLESTREAMLISTENER

  // The status of AlternativeDataStreamListener
  // LOADING: is the initial status, loading the alternative data
  // COMPLETED: Alternative data loading is completed
  // CANCELED: Alternative data loading is canceled, this would make
  //           AlternativeDataStreamListener ignore all channel callbacks
  // FALLBACK: fallback the channel callbacks to FetchDriver
  // Depends on different situaions, the status transition could be followings
  // 1. LOADING->COMPLETED
  //    This is the normal status transition for alternative data loading
  //
  // 2. LOADING->CANCELED
  //    LOADING->COMPLETED->CANCELED
  //    Alternative data loading could be canceled when cacheId from alternative
  //    data channel does not match with from main data channel(The cacheID
  //    checking is in FetchDriver::OnStartRequest).
  //    Notice the alternative data loading could finish before the cacheID
  //    checking, so the statust transition could be
  //    LOADING->COMPLETED->CANCELED
  //
  // 3. LOADING->FALLBACK
  //    For the case that alternative data loading could not be initialized,
  //    i.e. alternative data does not exist or no preferred alternative data
  //    type is requested. Once the status becomes FALLBACK,
  //    AlternativeDataStreamListener transits the channel callback request to
  //    FetchDriver, and the status should not go back to LOADING, COMPLETED, or
  //    CANCELED anymore.
  enum eStatus { LOADING = 0, COMPLETED, CANCELED, FALLBACK };

  AlternativeDataStreamListener(FetchDriver* aFetchDriver, nsIChannel* aChannel,
                                const nsACString& aAlternativeDataType);
  eStatus Status();
  void Cancel();
  uint64_t GetAlternativeDataCacheEntryId();
  const nsACString& GetAlternativeDataType() const;
  already_AddRefed<nsICacheInfoChannel> GetCacheInfoChannel();
  already_AddRefed<nsIInputStream> GetAlternativeInputStream();

 private:
  ~AlternativeDataStreamListener() = default;

  // This creates a strong reference cycle with FetchDriver and its
  // mAltDataListener. We need to clear at least one reference of them once the
  // data loading finishes.
  RefPtr<FetchDriver> mFetchDriver;
  nsCString mAlternativeDataType;
  nsCOMPtr<nsIInputStream> mPipeAlternativeInputStream;
  nsCOMPtr<nsIOutputStream> mPipeAlternativeOutputStream;
  uint64_t mAlternativeDataCacheEntryId;
  nsCOMPtr<nsICacheInfoChannel> mCacheInfoChannel;
  nsCOMPtr<nsIChannel> mChannel;
  Atomic<eStatus> mStatus;
};

NS_IMPL_ISUPPORTS(AlternativeDataStreamListener, nsIStreamListener,
                  nsIThreadRetargetableStreamListener)

AlternativeDataStreamListener::AlternativeDataStreamListener(
    FetchDriver* aFetchDriver, nsIChannel* aChannel,
    const nsACString& aAlternativeDataType)
    : mFetchDriver(aFetchDriver),
      mAlternativeDataType(aAlternativeDataType),
      mAlternativeDataCacheEntryId(0),
      mChannel(aChannel),
      mStatus(AlternativeDataStreamListener::LOADING) {
  MOZ_DIAGNOSTIC_ASSERT(mFetchDriver);
  MOZ_DIAGNOSTIC_ASSERT(mChannel);
}

AlternativeDataStreamListener::eStatus AlternativeDataStreamListener::Status() {
  return mStatus;
}

void AlternativeDataStreamListener::Cancel() {
  mAlternativeDataCacheEntryId = 0;
  mCacheInfoChannel = nullptr;
  mPipeAlternativeOutputStream = nullptr;
  mPipeAlternativeInputStream = nullptr;
  if (mChannel && mStatus != AlternativeDataStreamListener::FALLBACK) {
    // if mStatus is fallback, we need to keep channel to forward request back
    // to FetchDriver
    mChannel->CancelWithReason(NS_BINDING_ABORTED,
                               "AlternativeDataStreamListener::Cancel"_ns);
    mChannel = nullptr;
  }
  mStatus = AlternativeDataStreamListener::CANCELED;
}

uint64_t AlternativeDataStreamListener::GetAlternativeDataCacheEntryId() {
  return mAlternativeDataCacheEntryId;
}

const nsACString& AlternativeDataStreamListener::GetAlternativeDataType()
    const {
  return mAlternativeDataType;
}

already_AddRefed<nsIInputStream>
AlternativeDataStreamListener::GetAlternativeInputStream() {
  nsCOMPtr<nsIInputStream> inputStream = mPipeAlternativeInputStream;
  return inputStream.forget();
}

already_AddRefed<nsICacheInfoChannel>
AlternativeDataStreamListener::GetCacheInfoChannel() {
  nsCOMPtr<nsICacheInfoChannel> channel = mCacheInfoChannel;
  return channel.forget();
}

NS_IMETHODIMP
AlternativeDataStreamListener::OnStartRequest(nsIRequest* aRequest) {
  AssertIsOnMainThread();
  MOZ_ASSERT(!mAlternativeDataType.IsEmpty());
  // Checking the alternative data type is the same between we asked and the
  // saved in the channel.
  nsAutoCString alternativeDataType;
  nsCOMPtr<nsICacheInfoChannel> cic = do_QueryInterface(aRequest);
  mStatus = AlternativeDataStreamListener::LOADING;
  if (cic && NS_SUCCEEDED(cic->GetAlternativeDataType(alternativeDataType)) &&
      mAlternativeDataType.Equals(alternativeDataType) &&
      NS_SUCCEEDED(cic->GetCacheEntryId(&mAlternativeDataCacheEntryId))) {
    MOZ_DIAGNOSTIC_ASSERT(!mPipeAlternativeInputStream);
    MOZ_DIAGNOSTIC_ASSERT(!mPipeAlternativeOutputStream);
    NS_NewPipe(getter_AddRefs(mPipeAlternativeInputStream),
               getter_AddRefs(mPipeAlternativeOutputStream),
               0 /* default segment size */, UINT32_MAX /* infinite pipe */,
               true /* non-blocking input, otherwise you deadlock */,
               false /* blocking output, since the pipe is 'in'finite */);

    MOZ_DIAGNOSTIC_ASSERT(!mCacheInfoChannel);
    mCacheInfoChannel = cic;

    // call FetchDriver::HttpFetch to load main body
    MOZ_ASSERT(mFetchDriver);
    return mFetchDriver->HttpFetch();
  }
  // Needn't load alternative data, since alternative data does not exist.
  // Set status to FALLBACK to reuse the opened channel to load main body,
  // then call FetchDriver::OnStartRequest to continue the work. Unfortunately
  // can't change the stream listener to mFetchDriver, need to keep
  // AlternativeDataStreamListener alive to redirect OnDataAvailable and
  // OnStopRequest to mFetchDriver.
  MOZ_ASSERT(alternativeDataType.IsEmpty());
  mStatus = AlternativeDataStreamListener::FALLBACK;
  mAlternativeDataCacheEntryId = 0;
  MOZ_ASSERT(mFetchDriver);
  return mFetchDriver->OnStartRequest(aRequest);
}

NS_IMETHODIMP
AlternativeDataStreamListener::OnDataAvailable(nsIRequest* aRequest,
                                               nsIInputStream* aInputStream,
                                               uint64_t aOffset,
                                               uint32_t aCount) {
  if (mStatus == AlternativeDataStreamListener::LOADING) {
    MOZ_ASSERT(mPipeAlternativeOutputStream);
    uint32_t read = 0;
    return aInputStream->ReadSegments(
        NS_CopySegmentToStream, mPipeAlternativeOutputStream, aCount, &read);
  }
  if (mStatus == AlternativeDataStreamListener::FALLBACK) {
    MOZ_ASSERT(mFetchDriver);
    return mFetchDriver->OnDataAvailable(aRequest, aInputStream, aOffset,
                                         aCount);
  }
  return NS_OK;
}

NS_IMETHODIMP
AlternativeDataStreamListener::OnStopRequest(nsIRequest* aRequest,
                                             nsresult aStatusCode) {
  AssertIsOnMainThread();

  // Alternative data loading is going to finish, breaking the reference cycle
  // here by taking the ownership to a loacl variable.
  RefPtr<FetchDriver> fetchDriver = std::move(mFetchDriver);

  if (mStatus == AlternativeDataStreamListener::CANCELED) {
    // do nothing
    return NS_OK;
  }

  if (mStatus == AlternativeDataStreamListener::FALLBACK) {
    MOZ_ASSERT(fetchDriver);
    return fetchDriver->OnStopRequest(aRequest, aStatusCode);
  }

  MOZ_DIAGNOSTIC_ASSERT(mStatus == AlternativeDataStreamListener::LOADING);

  MOZ_ASSERT(!mAlternativeDataType.IsEmpty() && mPipeAlternativeOutputStream &&
             mPipeAlternativeInputStream);

  mPipeAlternativeOutputStream->Close();
  mPipeAlternativeOutputStream = nullptr;

  // Cleanup the states for alternative data if needed.
  if (NS_FAILED(aStatusCode)) {
    mAlternativeDataCacheEntryId = 0;
    mCacheInfoChannel = nullptr;
    mPipeAlternativeInputStream = nullptr;
  }
  mStatus = AlternativeDataStreamListener::COMPLETED;
  // alternative data loading finish, call FetchDriver::FinishOnStopRequest to
  // continue the final step for the case FetchDriver::OnStopRequest is called
  // earlier than AlternativeDataStreamListener::OnStopRequest
  MOZ_ASSERT(fetchDriver);
  fetchDriver->FinishOnStopRequest(this);
  return NS_OK;
}

NS_IMETHODIMP
AlternativeDataStreamListener::CheckListenerChain() { return NS_OK; }
//-----------------------------------------------------------------------------
// FetchDriver
//-----------------------------------------------------------------------------

NS_IMPL_ISUPPORTS(FetchDriver, nsIStreamListener, nsIChannelEventSink,
                  nsIInterfaceRequestor, nsIThreadRetargetableStreamListener,
                  nsINetworkInterceptController)

FetchDriver::FetchDriver(SafeRefPtr<InternalRequest> aRequest,
                         nsIPrincipal* aPrincipal, nsILoadGroup* aLoadGroup,
                         nsIEventTarget* aMainThreadEventTarget,
                         nsICookieJarSettings* aCookieJarSettings,
                         PerformanceStorage* aPerformanceStorage,
                         bool aIsTrackingFetch)
    : mPrincipal(aPrincipal),
      mLoadGroup(aLoadGroup),
      mRequest(std::move(aRequest)),
      mMainThreadEventTarget(aMainThreadEventTarget),
      mCookieJarSettings(aCookieJarSettings),
      mPerformanceStorage(aPerformanceStorage),
      mNeedToObserveOnDataAvailable(false),
      mIsTrackingFetch(aIsTrackingFetch),
      mOnStopRequestCalled(false)
#ifdef DEBUG
      ,
      mResponseAvailableCalled(false),
      mFetchCalled(false)
#endif
{
  AssertIsOnMainThread();

  MOZ_ASSERT(mRequest);
  MOZ_ASSERT(aPrincipal);
  MOZ_ASSERT(aMainThreadEventTarget);
}

FetchDriver::~FetchDriver() {
  AssertIsOnMainThread();

  // We assert this since even on failures, we should call
  // FailWithNetworkError().
  MOZ_ASSERT(mResponseAvailableCalled);
  if (mObserver) {
    mObserver = nullptr;
  }
}

already_AddRefed<PreloaderBase> FetchDriver::FindPreload(nsIURI* aURI) {
  // Decide if we allow reuse of an existing <link rel=preload as=fetch>
  // response for this request.  First examine this fetch requets itself if it
  // is 'pure' enough to use the response and then try to find a preload.

  if (!mDocument) {
    // Preloads are mapped on the document, no document, no preload.
    return nullptr;
  }
  CORSMode cors;
  switch (mRequest->Mode()) {
    case RequestMode::No_cors:
      cors = CORSMode::CORS_NONE;
      break;
    case RequestMode::Cors:
      cors = mRequest->GetCredentialsMode() == RequestCredentials::Include
                 ? CORSMode::CORS_USE_CREDENTIALS
                 : CORSMode::CORS_ANONYMOUS;
      break;
    default:
      // Can't be satisfied by a preload because preload cannot define any of
      // remaining modes.
      return nullptr;
  }
  if (!mRequest->Headers()->HasOnlySimpleHeaders()) {
    // Preload can't set any headers.
    return nullptr;
  }
  if (!mRequest->GetIntegrity().IsEmpty()) {
    // There is currently no support for SRI checking in the fetch preloader.
    return nullptr;
  }
  if (mRequest->GetCacheMode() != RequestCache::Default) {
    // Preload can only go with the default caching mode.
    return nullptr;
  }
  if (mRequest->SkipServiceWorker()) {
    // Preload can't be forbidden interception.
    return nullptr;
  }
  if (mRequest->GetRedirectMode() != RequestRedirect::Follow) {
    // Preload always follows redirects.
    return nullptr;
  }
  nsAutoCString method;
  mRequest->GetMethod(method);
  if (!method.EqualsLiteral("GET")) {
    // Preload can only do GET, this also eliminates the case we do upload, so
    // no need to check if the request has any body to send out.
    return nullptr;
  }

  // OK, this request can be satisfied by a preloaded response, try to find one.

  auto preloadKey = PreloadHashKey::CreateAsFetch(aURI, cors);
  return mDocument->Preloads().LookupPreload(preloadKey);
}

void FetchDriver::UpdateReferrerInfoFromNewChannel(nsIChannel* aChannel) {
  nsCOMPtr<nsIHttpChannel> httpChannel = do_QueryInterface(aChannel);
  if (!httpChannel) {
    return;
  }

  nsCOMPtr<nsIReferrerInfo> referrerInfo = httpChannel->GetReferrerInfo();
  if (!referrerInfo) {
    return;
  }

  nsAutoString computedReferrerSpec;
  mRequest->SetReferrerPolicy(referrerInfo->ReferrerPolicy());
  Unused << referrerInfo->GetComputedReferrerSpec(computedReferrerSpec);
  mRequest->SetReferrer(computedReferrerSpec);
}

nsresult FetchDriver::Fetch(AbortSignalImpl* aSignalImpl,
                            FetchDriverObserver* aObserver) {
  AssertIsOnMainThread();
#ifdef DEBUG
  MOZ_ASSERT(!mFetchCalled);
  mFetchCalled = true;
#endif

  mObserver = aObserver;

  // FIXME(nsm): Deal with HSTS.

  MOZ_RELEASE_ASSERT(!mRequest->IsSynchronous(),
                     "Synchronous fetch not supported");

  UniquePtr<mozilla::ipc::PrincipalInfo> principalInfo(
      new mozilla::ipc::PrincipalInfo());
  nsresult rv = PrincipalToPrincipalInfo(mPrincipal, principalInfo.get());
  if (NS_WARN_IF(NS_FAILED(rv))) {
    return rv;
  }

  mRequest->SetPrincipalInfo(std::move(principalInfo));

  // If the signal is aborted, it's time to inform the observer and terminate
  // the operation.
  if (aSignalImpl) {
    if (aSignalImpl->Aborted()) {
      FetchDriverAbortActions(aSignalImpl);
      return NS_OK;
    }

    Follow(aSignalImpl);
  }

  rv = HttpFetch(mRequest->GetPreferredAlternativeDataType());
  if (NS_FAILED(rv)) {
    FailWithNetworkError(rv);
  }

  // Any failure is handled by FailWithNetworkError notifying the aObserver.
  return NS_OK;
}

// This function implements the "HTTP Fetch" algorithm from the Fetch spec.
// Functionality is often split between here, the CORS listener proxy and the
// Necko HTTP implementation.
nsresult FetchDriver::HttpFetch(
    const nsACString& aPreferredAlternativeDataType) {
  MOZ_ASSERT(NS_IsMainThread());

  // Step 1. "Let response be null."
  mResponse = nullptr;
  mOnStopRequestCalled = false;
  nsresult rv;

  nsCOMPtr<nsIIOService> ios = do_GetIOService(&rv);
  NS_ENSURE_SUCCESS(rv, rv);

  nsAutoCString url;
  mRequest->GetURL(url);
  nsCOMPtr<nsIURI> uri;
  rv = NS_NewURI(getter_AddRefs(uri), url);
  NS_ENSURE_SUCCESS(rv, rv);

  // Unsafe requests aren't allowed with when using no-core mode.
  if (mRequest->Mode() == RequestMode::No_cors && mRequest->UnsafeRequest() &&
      (!mRequest->HasSimpleMethod() ||
       !mRequest->Headers()->HasOnlySimpleHeaders())) {
    MOZ_ASSERT(false, "The API should have caught this");
    return NS_ERROR_DOM_BAD_URI;
  }

  // non-GET requests aren't allowed for blob.
  if (IsBlobURI(uri)) {
    nsAutoCString method;
    mRequest->GetMethod(method);
    if (!method.EqualsLiteral("GET")) {
      return NS_ERROR_DOM_NETWORK_ERR;
    }
  }

  RefPtr<PreloaderBase> fetchPreload = FindPreload(uri);
  if (fetchPreload) {
    fetchPreload->RemoveSelf(mDocument);
    fetchPreload->NotifyUsage(mDocument, PreloaderBase::LoadBackground::Keep);

    rv = fetchPreload->AsyncConsume(this);
    if (NS_SUCCEEDED(rv)) {
      mFromPreload = true;

      mChannel = fetchPreload->Channel();
      MOZ_ASSERT(mChannel);
      mChannel->SetNotificationCallbacks(this);

      // Copied from AsyncOnChannelRedirect.
      for (const auto& redirect : fetchPreload->Redirects()) {
        if (redirect.Flags() & nsIChannelEventSink::REDIRECT_INTERNAL) {
          mRequest->SetURLForInternalRedirect(redirect.Flags(), redirect.Spec(),
                                              redirect.Fragment());
        } else {
          mRequest->AddURL(redirect.Spec(), redirect.Fragment());
        }
      }

      return NS_OK;
    }

    // The preload failed to be consumed.  Behave like there were no preload.
    fetchPreload = nullptr;
  }

  // Step 2 deals with letting ServiceWorkers intercept requests. This is
  // handled by Necko after the channel is opened.
  // FIXME(nsm): Bug 1119026: The channel's skip service worker flag should be
  // set based on the Request's flag.

  // Step 3.1 "If the CORS preflight flag is set and one of these conditions is
  // true..." is handled by the CORS proxy.
  //
  // Step 3.2 "Set request's skip service worker flag." This isn't required
  // since Necko will fall back to the network if the ServiceWorker does not
  // respond with a valid Response.
  //
  // NS_StartCORSPreflight() will automatically kick off the original request
  // if it succeeds, so we need to have everything setup for the original
  // request too.

  // Step 3.3 "Let credentials flag be set if one of
  //  - request's credentials mode is "include"
  //  - request's credentials mode is "same-origin" and either the CORS flag
  //    is unset or response tainting is "opaque"
  // is true, and unset otherwise."

  // Set skip serviceworker flag.
  // While the spec also gates on the client being a ServiceWorker, we can't
  // infer that here. Instead we rely on callers to set the flag correctly.
  const nsLoadFlags bypassFlag = mRequest->SkipServiceWorker()
                                     ? nsIChannel::LOAD_BYPASS_SERVICE_WORKER
                                     : 0;

  nsSecurityFlags secFlags = 0;
  if (mRequest->Mode() == RequestMode::Cors) {
    secFlags |= nsILoadInfo::SEC_REQUIRE_CORS_INHERITS_SEC_CONTEXT;
  } else if (mRequest->Mode() == RequestMode::Same_origin ||
             mRequest->Mode() == RequestMode::Navigate) {
    secFlags |= nsILoadInfo::SEC_REQUIRE_SAME_ORIGIN_INHERITS_SEC_CONTEXT;
  } else if (mRequest->Mode() == RequestMode::No_cors) {
    secFlags |= nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_INHERITS_SEC_CONTEXT;
  } else {
    MOZ_ASSERT_UNREACHABLE("Unexpected request mode!");
    return NS_ERROR_UNEXPECTED;
  }

  if (mRequest->GetRedirectMode() != RequestRedirect::Follow) {
    secFlags |= nsILoadInfo::SEC_DONT_FOLLOW_REDIRECTS;
  }

  // This handles the use credentials flag in "HTTP
  // network or cache fetch" in the spec and decides whether to transmit
  // cookies and other identifying information.
  if (mRequest->GetCredentialsMode() == RequestCredentials::Include) {
    secFlags |= nsILoadInfo::SEC_COOKIES_INCLUDE;
  } else if (mRequest->GetCredentialsMode() == RequestCredentials::Omit) {
    secFlags |= nsILoadInfo::SEC_COOKIES_OMIT;
  } else if (mRequest->GetCredentialsMode() ==
             RequestCredentials::Same_origin) {
    secFlags |= nsILoadInfo::SEC_COOKIES_SAME_ORIGIN;
  } else {
    MOZ_ASSERT_UNREACHABLE("Unexpected credentials mode!");
    return NS_ERROR_UNEXPECTED;
  }

  // From here on we create a channel and set its properties with the
  // information from the InternalRequest. This is an implementation detail.
  MOZ_ASSERT(mLoadGroup);
  nsCOMPtr<nsIChannel> chan;

  nsLoadFlags loadFlags = nsIRequest::LOAD_BACKGROUND | bypassFlag;
  if (mDocument) {
    MOZ_ASSERT(mDocument->NodePrincipal() == mPrincipal);
    MOZ_ASSERT(mDocument->CookieJarSettings() == mCookieJarSettings);
    rv = NS_NewChannel(getter_AddRefs(chan), uri, mDocument, secFlags,
                       mRequest->ContentPolicyType(),
                       nullptr,             /* aPerformanceStorage */
                       mLoadGroup, nullptr, /* aCallbacks */
                       loadFlags, ios);
  } else if (mClientInfo.isSome()) {
    rv = NS_NewChannel(getter_AddRefs(chan), uri, mPrincipal, mClientInfo.ref(),
                       mController, secFlags, mRequest->ContentPolicyType(),
                       mCookieJarSettings, mPerformanceStorage, mLoadGroup,
                       nullptr, /* aCallbacks */
                       loadFlags, ios);
  } else {
    rv =
        NS_NewChannel(getter_AddRefs(chan), uri, mPrincipal, secFlags,
                      mRequest->ContentPolicyType(), mCookieJarSettings,
                      mPerformanceStorage, mLoadGroup, nullptr, /* aCallbacks */
                      loadFlags, ios);
  }
  NS_ENSURE_SUCCESS(rv, rv);

  if (mCSPEventListener) {
    nsCOMPtr<nsILoadInfo> loadInfo = chan->LoadInfo();
    rv = loadInfo->SetCspEventListener(mCSPEventListener);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  {
    nsCOMPtr<nsILoadInfo> loadInfo = chan->LoadInfo();
    rv = loadInfo->SetLoadingEmbedderPolicy(mRequest->GetEmbedderPolicy());
    NS_ENSURE_SUCCESS(rv, rv);
  }

  if (mAssociatedBrowsingContextID) {
    nsCOMPtr<nsILoadInfo> loadInfo = chan->LoadInfo();
    rv = loadInfo->SetWorkerAssociatedBrowsingContextID(
        mAssociatedBrowsingContextID);
  }

  // If the fetch is created by FetchEvent.request or NavigationPreload request,
  // corresponding InterceptedHttpChannel information need to propagte to the
  // channel of the fetch.
  if (mRequest->GetInterceptionTriggeringPrincipalInfo()) {
    auto principalOrErr = mozilla::ipc::PrincipalInfoToPrincipal(
        *(mRequest->GetInterceptionTriggeringPrincipalInfo().get()));
    if (!principalOrErr.isErr()) {
      nsCOMPtr<nsIPrincipal> principal = principalOrErr.unwrap();

      nsTArray<nsCOMPtr<nsIRedirectHistoryEntry>> redirectChain;
      if (!mRequest->InterceptionRedirectChain().IsEmpty()) {
        for (const RedirectHistoryEntryInfo& entryInfo :
             mRequest->InterceptionRedirectChain()) {
          nsCOMPtr<nsIRedirectHistoryEntry> entry =
              mozilla::ipc::RHEntryInfoToRHEntry(entryInfo);
          redirectChain.AppendElement(entry);
        }
      }

      nsCOMPtr<nsILoadInfo> loadInfo = chan->LoadInfo();
      MOZ_ASSERT(loadInfo);
      loadInfo->SetInterceptionInfo(new mozilla::net::InterceptionInfo(
          principal, mRequest->InterceptionContentPolicyType(), redirectChain,
          mRequest->InterceptionFromThirdParty()));
    }
  }

  if (mDocument && mDocument->GetEmbedderElement() &&
      mDocument->GetEmbedderElement()->IsAnyOfHTMLElements(nsGkAtoms::object,
                                                           nsGkAtoms::embed)) {
    nsCOMPtr<nsILoadInfo> loadInfo = chan->LoadInfo();
    rv = loadInfo->SetIsFromObjectOrEmbed(true);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  // Insert ourselves into the notification callbacks chain so we can set
  // headers on redirects.
#ifdef DEBUG
  {
    nsCOMPtr<nsIInterfaceRequestor> notificationCallbacks;
    chan->GetNotificationCallbacks(getter_AddRefs(notificationCallbacks));
    MOZ_ASSERT(!notificationCallbacks);
  }
#endif
  chan->SetNotificationCallbacks(this);

  nsCOMPtr<nsIClassOfService> cos(do_QueryInterface(chan));
  // Mark channel as urgent-start if the Fetch is triggered by user input
  // events.
  if (cos && UserActivation::IsHandlingUserInput()) {
    cos->AddClassFlags(nsIClassOfService::UrgentStart);
  }

  // Step 3.5 begins "HTTP network or cache fetch".
  // HTTP network or cache fetch
  // ---------------------------
  // Step 1 "Let HTTPRequest..." The channel is the HTTPRequest.
  nsCOMPtr<nsIHttpChannel> httpChan = do_QueryInterface(chan);
  if (httpChan) {
    // Copy the method.
    nsAutoCString method;
    mRequest->GetMethod(method);
    rv = httpChan->SetRequestMethod(method);
    NS_ENSURE_SUCCESS(rv, rv);

    // Set the same headers.
    SetRequestHeaders(httpChan, false, false);

    // Step 5 of https://fetch.spec.whatwg.org/#main-fetch
    // If request's referrer policy is the empty string and request's client is
    // non-null, then set request's referrer policy to request's client's
    // associated referrer policy.
    // Basically, "client" is not in our implementation, we use
    // EnvironmentReferrerPolicy of the worker or document context
    ReferrerPolicy referrerPolicy = mRequest->GetEnvironmentReferrerPolicy();
    if (mRequest->ReferrerPolicy_() == ReferrerPolicy::_empty) {
      mRequest->SetReferrerPolicy(referrerPolicy);
    }
    // Step 6 of https://fetch.spec.whatwg.org/#main-fetch
    // If request’s referrer policy is the empty string,
    // then set request’s referrer policy to the user-set default policy.
    if (mRequest->ReferrerPolicy_() == ReferrerPolicy::_empty) {
      nsCOMPtr<nsILoadInfo> loadInfo = httpChan->LoadInfo();
      bool isPrivate = loadInfo->GetOriginAttributes().mPrivateBrowsingId > 0;
      referrerPolicy =
          ReferrerInfo::GetDefaultReferrerPolicy(httpChan, uri, isPrivate);
      mRequest->SetReferrerPolicy(referrerPolicy);
    }

    rv = FetchUtil::SetRequestReferrer(mPrincipal, mDocument, httpChan,
                                       *mRequest);
    NS_ENSURE_SUCCESS(rv, rv);

    // Bug 1120722 - Authorization will be handled later.
    // Auth may require prompting, we don't support it yet.
    // The next patch in this same bug prevents this from aborting the request.
    // Credentials checks for CORS are handled by nsCORSListenerProxy,

    nsCOMPtr<nsIHttpChannelInternal> internalChan = do_QueryInterface(httpChan);

    rv = internalChan->SetRequestMode(mRequest->Mode());
    MOZ_ASSERT(NS_SUCCEEDED(rv));
    // Conversion between enumerations is safe due to static asserts in
    // dom/workers/ServiceWorkerManager.cpp
    rv = internalChan->SetRedirectMode(
        static_cast<uint32_t>(mRequest->GetRedirectMode()));
    MOZ_ASSERT(NS_SUCCEEDED(rv));
    mRequest->MaybeSkipCacheIfPerformingRevalidation();
    rv = internalChan->SetFetchCacheMode(
        static_cast<uint32_t>(mRequest->GetCacheMode()));
    MOZ_ASSERT(NS_SUCCEEDED(rv));
    rv = internalChan->SetIntegrityMetadata(mRequest->GetIntegrity());
    MOZ_ASSERT(NS_SUCCEEDED(rv));

    // Set the initiator type
    nsCOMPtr<nsITimedChannel> timedChannel(do_QueryInterface(httpChan));
    if (timedChannel) {
      timedChannel->SetInitiatorType(u"fetch"_ns);
    }
  }

  // Step 5. Proxy authentication will be handled by Necko.

  // Continue setting up 'HTTPRequest'. Content-Type and body data.
  nsCOMPtr<nsIUploadChannel2> uploadChan = do_QueryInterface(chan);
  if (uploadChan) {
    nsAutoCString contentType;
    ErrorResult result;
    mRequest->Headers()->GetFirst("content-type"_ns, contentType, result);
    // We don't actually expect "result" to have failed here: that only happens
    // for invalid header names.  But if for some reason it did, just propagate
    // it out.
    if (result.Failed()) {
      return result.StealNSResult();
    }

    // Now contentType is the header that was set in mRequest->Headers(), or a
    // void string if no header was set.
#ifdef DEBUG
    bool hasContentTypeHeader =
        mRequest->Headers()->Has("content-type"_ns, result);
    MOZ_ASSERT(!result.Failed());
    MOZ_ASSERT_IF(!hasContentTypeHeader, contentType.IsVoid());
#endif  // DEBUG

    int64_t bodyLength;
    nsCOMPtr<nsIInputStream> bodyStream;
    mRequest->GetBody(getter_AddRefs(bodyStream), &bodyLength);
    if (bodyStream) {
      nsAutoCString method;
      mRequest->GetMethod(method);
      rv = uploadChan->ExplicitSetUploadStream(bodyStream, contentType,
                                               bodyLength, method,
                                               false /* aStreamHasHeaders */);
      NS_ENSURE_SUCCESS(rv, rv);
    }
  }

  // If preflight is required, start a "CORS preflight fetch"
  // https://fetch.spec.whatwg.org/#cors-preflight-fetch-0. All the
  // implementation is handled by the http channel calling into
  // nsCORSListenerProxy. We just inform it which unsafe headers are included
  // in the request.
  if (mRequest->Mode() == RequestMode::Cors) {
    AutoTArray<nsCString, 5> unsafeHeaders;
    mRequest->Headers()->GetUnsafeHeaders(unsafeHeaders);
    nsCOMPtr<nsILoadInfo> loadInfo = chan->LoadInfo();
    loadInfo->SetCorsPreflightInfo(unsafeHeaders, false);
  }

  if (mIsTrackingFetch && StaticPrefs::network_http_tailing_enabled() && cos) {
    cos->AddClassFlags(nsIClassOfService::Throttleable |
                       nsIClassOfService::Tail);
  }

  if (mIsTrackingFetch &&
      StaticPrefs::privacy_trackingprotection_lower_network_priority()) {
    nsCOMPtr<nsISupportsPriority> p = do_QueryInterface(chan);
    if (p) {
      p->SetPriority(nsISupportsPriority::PRIORITY_LOWEST);
    }
  }

  NotifyNetworkMonitorAlternateStack(chan, std::move(mOriginStack));
  if (mObserver && httpChan) {
    mObserver->OnNotifyNetworkMonitorAlternateStack(httpChan->ChannelId());
  }

  // if the preferred alternative data type in InternalRequest is not empty, set
  // the data type on the created channel and also create a
  // AlternativeDataStreamListener to be the stream listener of the channel.
  if (!aPreferredAlternativeDataType.IsEmpty()) {
    nsCOMPtr<nsICacheInfoChannel> cic = do_QueryInterface(chan);
    if (cic) {
      cic->PreferAlternativeDataType(
          aPreferredAlternativeDataType, ""_ns,
          nsICacheInfoChannel::PreferredAlternativeDataDeliveryType::ASYNC);
      MOZ_ASSERT(!mAltDataListener);
      mAltDataListener = new AlternativeDataStreamListener(
          this, chan, aPreferredAlternativeDataType);
      rv = chan->AsyncOpen(mAltDataListener);
    } else {
      rv = chan->AsyncOpen(this);
    }
  } else {
    // Integrity check cannot be done on alt-data yet.
    if (mRequest->GetIntegrity().IsEmpty()) {
      MOZ_ASSERT(!FetchUtil::WasmAltDataType.IsEmpty());
      nsCOMPtr<nsICacheInfoChannel> cic = do_QueryInterface(chan);
      if (cic && StaticPrefs::javascript_options_wasm_caching() &&
          !mRequest->SkipWasmCaching()) {
        cic->PreferAlternativeDataType(
            FetchUtil::WasmAltDataType, nsLiteralCString(WASM_CONTENT_TYPE),
            nsICacheInfoChannel::PreferredAlternativeDataDeliveryType::
                SERIALIZE);
      }
    }

    rv = chan->AsyncOpen(this);
  }

  if (NS_FAILED(rv)) {
    return rv;
  }

  // Step 4 onwards of "HTTP Fetch" is handled internally by Necko.

  mChannel = chan;
  return NS_OK;
}

SafeRefPtr<InternalResponse> FetchDriver::BeginAndGetFilteredResponse(
    SafeRefPtr<InternalResponse> aResponse, bool aFoundOpaqueRedirect) {
  MOZ_ASSERT(aResponse);
  AutoTArray<nsCString, 4> reqURLList;
  mRequest->GetURLListWithoutFragment(reqURLList);
  MOZ_ASSERT(!reqURLList.IsEmpty());
  aResponse->SetURLList(reqURLList);
  SafeRefPtr<InternalResponse> filteredResponse;
  if (aFoundOpaqueRedirect) {
    filteredResponse = aResponse->OpaqueRedirectResponse();
  } else {
    switch (mRequest->GetResponseTainting()) {
      case LoadTainting::Basic:
        filteredResponse = aResponse->BasicResponse();
        break;
      case LoadTainting::CORS:
        filteredResponse = aResponse->CORSResponse();
        break;
      case LoadTainting::Opaque: {
        filteredResponse = aResponse->OpaqueResponse();
        nsresult rv = filteredResponse->GeneratePaddingInfo();
        if (NS_WARN_IF(NS_FAILED(rv))) {
          return nullptr;
        }
        break;
      }
      default:
        MOZ_CRASH("Unexpected case");
    }
  }

  MOZ_ASSERT(filteredResponse);
  MOZ_ASSERT(mObserver);
  MOZ_ASSERT(filteredResponse);
  if (!ShouldCheckSRI(*mRequest, *filteredResponse)) {
    // Need to keep mObserver alive.
    RefPtr<FetchDriverObserver> observer = mObserver;
    observer->OnResponseAvailable(filteredResponse.clonePtr());
#ifdef DEBUG
    mResponseAvailableCalled = true;
#endif
  }

  return filteredResponse;
}

void FetchDriver::FailWithNetworkError(nsresult rv) {
  AssertIsOnMainThread();
  if (mObserver) {
    // Need to keep mObserver alive.
    RefPtr<FetchDriverObserver> observer = mObserver;
    observer->OnResponseAvailable(InternalResponse::NetworkError(rv));
#ifdef DEBUG
    mResponseAvailableCalled = true;
#endif
  }

  // mObserver could be null after OnResponseAvailable().
  if (mObserver) {
    mObserver->OnReportPerformanceTiming();
    mObserver->OnResponseEnd(FetchDriverObserver::eByNetworking,
                             JS::UndefinedHandleValue);
    mObserver = nullptr;
  }

  mChannel = nullptr;
  Unfollow();
}

NS_IMETHODIMP
FetchDriver::OnStartRequest(nsIRequest* aRequest) {
  AssertIsOnMainThread();

  // Note, this can be called multiple times if we are doing an opaqueredirect.
  // In that case we will get a simulated OnStartRequest() and then the real
  // channel will call in with an errored OnStartRequest().

  if (mFromPreload && mAborted) {
    aRequest->CancelWithReason(NS_BINDING_ABORTED,
                               "FetchDriver::OnStartRequest aborted"_ns);
    return NS_BINDING_ABORTED;
  }

  if (!mChannel) {
    // if the request is aborted, we remove the mObserver reference in
    // OnStopRequest or ~FetchDriver()
    MOZ_ASSERT_IF(!mAborted, !mObserver);
    return NS_BINDING_ABORTED;
  }

  nsresult rv;
  aRequest->GetStatus(&rv);
  if (NS_FAILED(rv)) {
    FailWithNetworkError(rv);
    return rv;
  }

  // We should only get to the following code once.
  MOZ_ASSERT(!mPipeOutputStream);

  if (!mObserver) {
    MOZ_ASSERT(false, "We should have mObserver here.");
    FailWithNetworkError(NS_ERROR_UNEXPECTED);
    return NS_ERROR_UNEXPECTED;
  }

  mNeedToObserveOnDataAvailable = mObserver->NeedOnDataAvailable();

  SafeRefPtr<InternalResponse> response;
  nsCOMPtr<nsIChannel> channel = do_QueryInterface(aRequest);
  nsCOMPtr<nsIHttpChannel> httpChannel = do_QueryInterface(aRequest);

  // On a successful redirect we perform the following substeps of HTTP Fetch,
  // step 5, "redirect status", step 11.

  bool foundOpaqueRedirect = false;

  nsAutoCString contentType;
  channel->GetContentType(contentType);

  int64_t contentLength = InternalResponse::UNKNOWN_BODY_SIZE;
  rv = channel->GetContentLength(&contentLength);
  MOZ_ASSERT_IF(NS_FAILED(rv),
                contentLength == InternalResponse::UNKNOWN_BODY_SIZE);

  if (httpChannel) {
    uint32_t responseStatus = 0;
    rv = httpChannel->GetResponseStatus(&responseStatus);
    if (NS_FAILED(rv)) {
      FailWithNetworkError(rv);
      return rv;
    }

    if (mozilla::net::nsHttpChannel::IsRedirectStatus(responseStatus)) {
      if (mRequest->GetRedirectMode() == RequestRedirect::Error) {
        FailWithNetworkError(NS_BINDING_ABORTED);
        return NS_BINDING_FAILED;
      }
      if (mRequest->GetRedirectMode() == RequestRedirect::Manual) {
        foundOpaqueRedirect = true;
      }
    }

    nsAutoCString statusText;
    rv = httpChannel->GetResponseStatusText(statusText);
    MOZ_ASSERT(NS_SUCCEEDED(rv));

    response = MakeSafeRefPtr<InternalResponse>(responseStatus, statusText,
                                                mRequest->GetCredentialsMode());

    UniquePtr<mozilla::ipc::PrincipalInfo> principalInfo(
        new mozilla::ipc::PrincipalInfo());
    nsresult rv = PrincipalToPrincipalInfo(mPrincipal, principalInfo.get());
    if (NS_WARN_IF(NS_FAILED(rv))) {
      return rv;
    }

    response->SetPrincipalInfo(std::move(principalInfo));

    response->Headers()->FillResponseHeaders(httpChannel);

    // If Content-Encoding or Transfer-Encoding headers are set, then the actual
    // Content-Length (which refer to the decoded data) is obscured behind the
    // encodings.
    ErrorResult result;
    if (response->Headers()->Has("content-encoding"_ns, result) ||
        response->Headers()->Has("transfer-encoding"_ns, result)) {
      // We cannot trust the content-length when content-encoding or
      // transfer-encoding are set.  There are many servers which just
      // get this wrong.
      contentLength = InternalResponse::UNKNOWN_BODY_SIZE;
    }
    MOZ_ASSERT(!result.Failed());
  } else {
    response = MakeSafeRefPtr<InternalResponse>(200, "OK"_ns,
                                                mRequest->GetCredentialsMode());

    if (!contentType.IsEmpty()) {
      nsAutoCString contentCharset;
      channel->GetContentCharset(contentCharset);
      if (NS_SUCCEEDED(rv) && !contentCharset.IsEmpty()) {
        contentType += ";charset="_ns + contentCharset;
      }
    }

    IgnoredErrorResult result;
    response->Headers()->Append("Content-Type"_ns, contentType, result);
    MOZ_ASSERT(!result.Failed());

    if (contentLength >= 0) {
      nsAutoCString contentLenStr;
      contentLenStr.AppendInt(contentLength);

      IgnoredErrorResult result;
      response->Headers()->Append("Content-Length"_ns, contentLenStr, result);
      MOZ_ASSERT(!result.Failed());
    }
  }

  nsCOMPtr<nsICacheInfoChannel> cic = do_QueryInterface(aRequest);
  if (cic) {
    if (mAltDataListener) {
      // Skip the case that mAltDataListener->Status() equals to FALLBACK, that
      // means the opened channel for alternative data loading is reused for
      // loading the main data.
      if (mAltDataListener->Status() !=
          AlternativeDataStreamListener::FALLBACK) {
        // Verify the cache ID is the same with from alternative data cache.
        // If the cache ID is different, droping the alternative data loading,
        // otherwise setup the response's alternative body and cacheInfoChannel.
        uint64_t cacheEntryId = 0;
        if (NS_SUCCEEDED(cic->GetCacheEntryId(&cacheEntryId)) &&
            cacheEntryId !=
                mAltDataListener->GetAlternativeDataCacheEntryId()) {
          mAltDataListener->Cancel();
        } else {
          // AlternativeDataStreamListener::OnStartRequest had already been
          // called, the alternative data input stream and cacheInfo channel
          // must be created.
          nsCOMPtr<nsICacheInfoChannel> cacheInfo =
              mAltDataListener->GetCacheInfoChannel();
          nsCOMPtr<nsIInputStream> altInputStream =
              mAltDataListener->GetAlternativeInputStream();
          MOZ_ASSERT(altInputStream && cacheInfo);
          response->SetAlternativeBody(altInputStream);
          nsMainThreadPtrHandle<nsICacheInfoChannel> handle(
              new nsMainThreadPtrHolder<nsICacheInfoChannel>(
                  "nsICacheInfoChannel", cacheInfo, false));
          response->SetCacheInfoChannel(handle);
        }
      } else if (!mAltDataListener->GetAlternativeDataType().IsEmpty()) {
        // If the status is FALLBACK and the
        // mAltDataListener::mAlternativeDataType is not empty, that means the
        // data need to be saved into cache, setup the response's
        // nsICacheInfoChannel for caching the data after loading.
        nsMainThreadPtrHandle<nsICacheInfoChannel> handle(
            new nsMainThreadPtrHolder<nsICacheInfoChannel>(
                "nsICacheInfoChannel", cic, false));
        response->SetCacheInfoChannel(handle);
      }
    } else if (!cic->PreferredAlternativeDataTypes().IsEmpty()) {
      MOZ_ASSERT(cic->PreferredAlternativeDataTypes().Length() == 1);
      MOZ_ASSERT(cic->PreferredAlternativeDataTypes()[0].type().Equals(
          FetchUtil::WasmAltDataType));
      MOZ_ASSERT(
          cic->PreferredAlternativeDataTypes()[0].contentType().EqualsLiteral(
              WASM_CONTENT_TYPE));

      if (contentType.EqualsLiteral(WASM_CONTENT_TYPE)) {
        // We want to attach the CacheInfoChannel to the response object such
        // that we can track its origin when the Response object is manipulated
        // by JavaScript code. This is important for WebAssembly, which uses
        // fetch to query its sources in JavaScript and transfer the Response
        // object to other function responsible for storing the alternate data
        // using the CacheInfoChannel.
        nsMainThreadPtrHandle<nsICacheInfoChannel> handle(
            new nsMainThreadPtrHolder<nsICacheInfoChannel>(
                "nsICacheInfoChannel", cic, false));
        response->SetCacheInfoChannel(handle);
      }
    }
  }

  // We open a pipe so that we can immediately set the pipe's read end as the
  // response's body. Setting the segment size to UINT32_MAX means that the
  // pipe has infinite space. The nsIChannel will continue to buffer data in
  // xpcom events even if we block on a fixed size pipe.  It might be possible
  // to suspend the channel and then resume when there is space available, but
  // for now use an infinite pipe to avoid blocking.
  nsCOMPtr<nsIInputStream> pipeInputStream;
  NS_NewPipe(getter_AddRefs(pipeInputStream), getter_AddRefs(mPipeOutputStream),
             0, /* default segment size */
             UINT32_MAX /* infinite pipe */,
             true /* non-blocking input, otherwise you deadlock */,
             false /* blocking output, since the pipe is 'in'finite */);
  response->SetBody(pipeInputStream, contentLength);

  // If the request is a file channel, then remember the local path to
  // that file so we can later create File blobs rather than plain ones.
  nsCOMPtr<nsIFileChannel> fc = do_QueryInterface(aRequest);
  if (fc) {
    nsCOMPtr<nsIFile> file;
    rv = fc->GetFile(getter_AddRefs(file));
    if (!NS_WARN_IF(NS_FAILED(rv))) {
      nsAutoString path;
      file->GetPath(path);
      response->SetBodyLocalPath(path);
    }
  } else {
    // If the request is a blob URI, then remember that URI so that we
    // can later just use that blob instance instead of cloning it.
    nsCString blobURISpec;
    GetBlobURISpecFromChannel(aRequest, blobURISpec);
    if (!blobURISpec.IsVoid()) {
      response->SetBodyBlobURISpec(blobURISpec);
    }
  }

  response->InitChannelInfo(channel);

  nsCOMPtr<nsILoadInfo> loadInfo = channel->LoadInfo();
  // Propagate any tainting from the channel back to our response here.  This
  // step is not reflected in the spec because the spec is written such that
  // FetchEvent.respondWith() just passes the already-tainted Response back to
  // the outer fetch().  In gecko, however, we serialize the Response through
  // the channel and must regenerate the tainting from the channel in the
  // interception case.
  mRequest->MaybeIncreaseResponseTainting(loadInfo->GetTainting());

  // Resolves fetch() promise which may trigger code running in a worker.  Make
  // sure the Response is fully initialized before calling this.
  mResponse =
      BeginAndGetFilteredResponse(std::move(response), foundOpaqueRedirect);
  if (NS_WARN_IF(!mResponse)) {
    // Fail to generate a paddingInfo for opaque response.
    MOZ_DIAGNOSTIC_ASSERT(mRequest->GetResponseTainting() ==
                              LoadTainting::Opaque &&
                          !foundOpaqueRedirect);
    FailWithNetworkError(NS_ERROR_UNEXPECTED);
    return NS_ERROR_UNEXPECTED;
  }

  // From "Main Fetch" step 19: SRI-part1.
  if (ShouldCheckSRI(*mRequest, *mResponse) && mSRIMetadata.IsEmpty()) {
    nsIConsoleReportCollector* reporter = nullptr;
    if (mObserver) {
      reporter = mObserver->GetReporter();
    }

    nsAutoCString sourceUri;
    if (mDocument && mDocument->GetDocumentURI()) {
      mDocument->GetDocumentURI()->GetAsciiSpec(sourceUri);
    } else if (!mWorkerScript.IsEmpty()) {
      sourceUri.Assign(mWorkerScript);
    }
    SRICheck::IntegrityMetadata(mRequest->GetIntegrity(), sourceUri, reporter,
                                &mSRIMetadata);
    mSRIDataVerifier =
        MakeUnique<SRICheckDataVerifier>(mSRIMetadata, sourceUri, reporter);

    // Do not retarget off main thread when using SRI API.
    return NS_OK;
  }

  nsCOMPtr<nsIEventTarget> sts =
      do_GetService(NS_STREAMTRANSPORTSERVICE_CONTRACTID, &rv);
  if (NS_WARN_IF(NS_FAILED(rv))) {
    FailWithNetworkError(rv);
    // Cancel request.
    return rv;
  }

  // Try to retarget off main thread.
  if (nsCOMPtr<nsIThreadRetargetableRequest> rr = do_QueryInterface(aRequest)) {
    RefPtr<TaskQueue> queue =
        TaskQueue::Create(sts.forget(), "FetchDriver STS Delivery Queue");
    Unused << NS_WARN_IF(NS_FAILED(rr->RetargetDeliveryTo(queue)));
  }
  return NS_OK;
}

namespace {

// Runnable to call the observer OnDataAvailable on the main-thread.
class DataAvailableRunnable final : public Runnable {
  RefPtr<FetchDriverObserver> mObserver;

 public:
  explicit DataAvailableRunnable(FetchDriverObserver* aObserver)
      : Runnable("dom::DataAvailableRunnable"), mObserver(aObserver) {
    MOZ_ASSERT(aObserver);
  }

  NS_IMETHOD
  Run() override {
    mObserver->OnDataAvailable();
    mObserver = nullptr;
    return NS_OK;
  }
};

struct SRIVerifierAndOutputHolder {
  SRIVerifierAndOutputHolder(SRICheckDataVerifier* aVerifier,
                             nsIOutputStream* aOutputStream)
      : mVerifier(aVerifier), mOutputStream(aOutputStream) {}

  SRICheckDataVerifier* mVerifier;
  nsIOutputStream* mOutputStream;

 private:
  SRIVerifierAndOutputHolder() = delete;
};

// Just like NS_CopySegmentToStream, but also sends the data into an
// SRICheckDataVerifier.
nsresult CopySegmentToStreamAndSRI(nsIInputStream* aInStr, void* aClosure,
                                   const char* aBuffer, uint32_t aOffset,
                                   uint32_t aCount, uint32_t* aCountWritten) {
  auto holder = static_cast<SRIVerifierAndOutputHolder*>(aClosure);
  MOZ_DIAGNOSTIC_ASSERT(holder && holder->mVerifier && holder->mOutputStream,
                        "Bogus holder");
  nsresult rv = holder->mVerifier->Update(
      aCount, reinterpret_cast<const uint8_t*>(aBuffer));
  NS_ENSURE_SUCCESS(rv, rv);

  // The rest is just like NS_CopySegmentToStream.
  *aCountWritten = 0;
  while (aCount) {
    uint32_t n = 0;
    rv = holder->mOutputStream->Write(aBuffer, aCount, &n);
    if (NS_FAILED(rv)) {
      return rv;
    }
    aBuffer += n;
    aCount -= n;
    *aCountWritten += n;
  }
  return NS_OK;
}

}  // anonymous namespace

NS_IMETHODIMP
FetchDriver::OnDataAvailable(nsIRequest* aRequest, nsIInputStream* aInputStream,
                             uint64_t aOffset, uint32_t aCount) {
  // NB: This can be called on any thread!  But we're guaranteed that it is
  // called between OnStartRequest and OnStopRequest, so we don't need to worry
  // about races for accesses in OnStartRequest, OnStopRequest and
  // member functions accessed before opening the channel.
  // However, we have a possibility of a race from FetchDriverAbortActions.
  // Hence, we need to ensure that we are not modifying any members accessed by
  // FetchDriver::FetchDriverAbortActions

  if (mNeedToObserveOnDataAvailable) {
    mNeedToObserveOnDataAvailable = false;
    if (mObserver) {
      // Need to keep mObserver alive.
      RefPtr<FetchDriverObserver> observer = mObserver;
      if (NS_IsMainThread()) {
        observer->OnDataAvailable();
      } else {
        RefPtr<Runnable> runnable = new DataAvailableRunnable(observer);
        nsresult rv = mMainThreadEventTarget->Dispatch(runnable.forget(),
                                                       NS_DISPATCH_NORMAL);
        if (NS_WARN_IF(NS_FAILED(rv))) {
          return rv;
        }
      }
    }
  }

  if (!mResponse) {
    MOZ_ASSERT(false);
    return NS_ERROR_UNEXPECTED;
  }

  // Needs to be initialized to 0 because in some cases nsStringInputStream may
  // not write to aRead.
  uint32_t aRead = 0;
  MOZ_ASSERT(mPipeOutputStream);

  // From "Main Fetch" step 19: SRI-part2.
  // Note: Avoid checking the hidden opaque body.
  nsresult rv;
  if (mResponse->Type() != ResponseType::Opaque &&
      ShouldCheckSRI(*mRequest, *mResponse)) {
    MOZ_ASSERT(mSRIDataVerifier);

    SRIVerifierAndOutputHolder holder(mSRIDataVerifier.get(),
                                      mPipeOutputStream);
    rv = aInputStream->ReadSegments(CopySegmentToStreamAndSRI, &holder, aCount,
                                    &aRead);
  } else {
    rv = aInputStream->ReadSegments(NS_CopySegmentToStream, mPipeOutputStream,
                                    aCount, &aRead);
  }

  // If no data was read, it's possible the output stream is closed but the
  // ReadSegments call followed its contract of returning NS_OK despite write
  // errors.  Unfortunately, nsIOutputStream has an ill-conceived contract when
  // taken together with ReadSegments' contract, because the pipe will just
  // NS_OK if we try and invoke its Write* functions ourselves with a 0 count.
  // So we must just assume the pipe is broken.
  if (aRead == 0 && aCount != 0) {
    return NS_BASE_STREAM_CLOSED;
  }
  return rv;
}

NS_IMETHODIMP
FetchDriver::OnStopRequest(nsIRequest* aRequest, nsresult aStatusCode) {
  AssertIsOnMainThread();

  MOZ_DIAGNOSTIC_ASSERT(!mOnStopRequestCalled);
  mOnStopRequestCalled = true;

  if (mObserver && mAborted) {
    // fetch request was aborted.
    // We have already sent the observer
    // notification that request has been aborted in FetchDriverAbortActions.
    // Remove the observer reference and don't push anymore notifications.
    mObserver = nullptr;
  }

  // main data loading is going to finish, breaking the reference cycle.
  RefPtr<AlternativeDataStreamListener> altDataListener =
      std::move(mAltDataListener);

  // For PFetch and ServiceWorker navigationPreload, resource timing should be
  // reported before the body stream closing.
  if (mObserver) {
    mObserver->OnReportPerformanceTiming();
  }

  // We need to check mObserver, which is nulled by FailWithNetworkError(),
  // because in the case of "error" redirect mode, aStatusCode may be NS_OK but
  // mResponse will definitely be null so we must not take the else branch.
  if (NS_FAILED(aStatusCode) || !mObserver) {
    nsCOMPtr<nsIAsyncOutputStream> outputStream =
        do_QueryInterface(mPipeOutputStream);
    if (outputStream) {
      outputStream->CloseWithStatus(NS_FAILED(aStatusCode) ? aStatusCode
                                                           : NS_BINDING_FAILED);
    }
    if (altDataListener) {
      altDataListener->Cancel();
    }

    // We proceed as usual here, since we've already created a successful
    // response from OnStartRequest.
  } else {
    MOZ_ASSERT(mResponse);
    MOZ_ASSERT(!mResponse->IsError());

    // From "Main Fetch" step 19: SRI-part3.
    if (ShouldCheckSRI(*mRequest, *mResponse)) {
      MOZ_ASSERT(mSRIDataVerifier);

      nsCOMPtr<nsIChannel> channel = do_QueryInterface(aRequest);

      nsIConsoleReportCollector* reporter = nullptr;
      if (mObserver) {
        reporter = mObserver->GetReporter();
      }

      nsAutoCString sourceUri;
      if (mDocument && mDocument->GetDocumentURI()) {
        mDocument->GetDocumentURI()->GetAsciiSpec(sourceUri);
      } else if (!mWorkerScript.IsEmpty()) {
        sourceUri.Assign(mWorkerScript);
      }
      nsresult rv =
          mSRIDataVerifier->Verify(mSRIMetadata, channel, sourceUri, reporter);
      if (NS_FAILED(rv)) {
        if (altDataListener) {
          altDataListener->Cancel();
        }
        FailWithNetworkError(rv);
        // Cancel request.
        return rv;
      }
    }

    if (mPipeOutputStream) {
      mPipeOutputStream->Close();
    }
  }

  FinishOnStopRequest(altDataListener);
  return NS_OK;
}

void FetchDriver::FinishOnStopRequest(
    AlternativeDataStreamListener* aAltDataListener) {
  AssertIsOnMainThread();
  // OnStopRequest is not called from channel, that means the main data loading
  // does not finish yet. Reaching here since alternative data loading finishes.
  if (!mOnStopRequestCalled) {
    return;
  }

  MOZ_DIAGNOSTIC_ASSERT(!mAltDataListener);
  // Wait for alternative data loading finish if we needed it.
  if (aAltDataListener &&
      aAltDataListener->Status() == AlternativeDataStreamListener::LOADING) {
    // For LOADING case, channel holds the reference of altDataListener, no need
    // to restore it to mAltDataListener.
    return;
  }

  if (mObserver) {
    // From "Main Fetch" step 19.1, 19.2: Process response.
    if (ShouldCheckSRI(*mRequest, *mResponse)) {
      MOZ_ASSERT(mResponse);
      // Need to keep mObserver alive.
      RefPtr<FetchDriverObserver> observer = mObserver;
      observer->OnResponseAvailable(mResponse.clonePtr());
#ifdef DEBUG
      mResponseAvailableCalled = true;
#endif
    }
  }

  if (mObserver) {
    mObserver->OnResponseEnd(FetchDriverObserver::eByNetworking,
                             JS::UndefinedHandleValue);
    mObserver = nullptr;
  }

  mChannel = nullptr;
  Unfollow();
}

NS_IMETHODIMP
FetchDriver::ShouldPrepareForIntercept(nsIURI* aURI, nsIChannel* aChannel,
                                       bool* aShouldIntercept) {
  MOZ_ASSERT(aChannel);

  if (mInterceptController) {
    MOZ_ASSERT(XRE_IsParentProcess());
    return mInterceptController->ShouldPrepareForIntercept(aURI, aChannel,
                                                           aShouldIntercept);
  }

  nsCOMPtr<nsINetworkInterceptController> controller;
  NS_QueryNotificationCallbacks(nullptr, mLoadGroup,
                                NS_GET_IID(nsINetworkInterceptController),
                                getter_AddRefs(controller));
  if (controller) {
    return controller->ShouldPrepareForIntercept(aURI, aChannel,
                                                 aShouldIntercept);
  }

  *aShouldIntercept = false;
  return NS_OK;
}

NS_IMETHODIMP
FetchDriver::ChannelIntercepted(nsIInterceptedChannel* aChannel) {
  if (mInterceptController) {
    MOZ_ASSERT(XRE_IsParentProcess());
    return mInterceptController->ChannelIntercepted(aChannel);
  }

  nsCOMPtr<nsINetworkInterceptController> controller;
  NS_QueryNotificationCallbacks(nullptr, mLoadGroup,
                                NS_GET_IID(nsINetworkInterceptController),
                                getter_AddRefs(controller));
  if (controller) {
    return controller->ChannelIntercepted(aChannel);
  }

  return NS_OK;
}

void FetchDriver::EnableNetworkInterceptControl() {
  MOZ_ASSERT(XRE_IsParentProcess());
  MOZ_ASSERT(NS_IsMainThread());
  MOZ_ASSERT(!mInterceptController);
  mInterceptController = new ServiceWorkerInterceptController();
}

NS_IMETHODIMP
FetchDriver::AsyncOnChannelRedirect(nsIChannel* aOldChannel,
                                    nsIChannel* aNewChannel, uint32_t aFlags,
                                    nsIAsyncVerifyRedirectCallback* aCallback) {
  nsCOMPtr<nsIHttpChannel> oldHttpChannel = do_QueryInterface(aOldChannel);
  nsCOMPtr<nsIHttpChannel> newHttpChannel = do_QueryInterface(aNewChannel);
  if (oldHttpChannel && newHttpChannel) {
    nsAutoCString method;
    mRequest->GetMethod(method);

    // Fetch 4.4.11
    bool rewriteToGET = false;
    Unused << oldHttpChannel->ShouldStripRequestBodyHeader(method,
                                                           &rewriteToGET);

    // we need to strip Authentication headers for cross-origin requests
    // Ref: https://fetch.spec.whatwg.org/#http-redirect-fetch
    bool skipAuthHeader =
        (StaticPrefs::network_fetch_redirect_stripAuthHeader() &&
         NS_ShouldRemoveAuthHeaderOnRedirect(aOldChannel, aNewChannel, aFlags));

    SetRequestHeaders(newHttpChannel, rewriteToGET, skipAuthHeader);
  }

  // "HTTP-redirect fetch": step 14 "Append locationURL to request's URL list."
  // However, ignore internal redirects here.  We don't want to flip
  // Response.redirected to true if an internal redirect occurs.  These
  // should be transparent to script.
  nsCOMPtr<nsIURI> uri;
  MOZ_ALWAYS_SUCCEEDS(NS_GetFinalChannelURI(aNewChannel, getter_AddRefs(uri)));

  nsCOMPtr<nsIURI> uriClone;
  nsresult rv = NS_GetURIWithoutRef(uri, getter_AddRefs(uriClone));
  if (NS_WARN_IF(NS_FAILED(rv))) {
    return rv;
  }
  nsCString spec;
  rv = uriClone->GetSpec(spec);
  if (NS_WARN_IF(NS_FAILED(rv))) {
    return rv;
  }
  nsCString fragment;
  rv = uri->GetRef(fragment);
  if (NS_WARN_IF(NS_FAILED(rv))) {
    return rv;
  }

  if (!(aFlags & nsIChannelEventSink::REDIRECT_INTERNAL)) {
    mRequest->AddURL(spec, fragment);
  } else {
    // Overwrite the URL only when the request is redirected by a service
    // worker.
    mRequest->SetURLForInternalRedirect(aFlags, spec, fragment);
  }

  // In redirect, httpChannel already took referrer-policy into account, so
  // updates request’s associated referrer policy from channel.
  UpdateReferrerInfoFromNewChannel(aNewChannel);

  aCallback->OnRedirectVerifyCallback(NS_OK);
  return NS_OK;
}

NS_IMETHODIMP
FetchDriver::CheckListenerChain() { return NS_OK; }

NS_IMETHODIMP
FetchDriver::GetInterface(const nsIID& aIID, void** aResult) {
  if (aIID.Equals(NS_GET_IID(nsIChannelEventSink))) {
    *aResult = static_cast<nsIChannelEventSink*>(this);
    NS_ADDREF_THIS();
    return NS_OK;
  }
  if (aIID.Equals(NS_GET_IID(nsIStreamListener))) {
    *aResult = static_cast<nsIStreamListener*>(this);
    NS_ADDREF_THIS();
    return NS_OK;
  }
  if (aIID.Equals(NS_GET_IID(nsIRequestObserver))) {
    *aResult = static_cast<nsIRequestObserver*>(this);
    NS_ADDREF_THIS();
    return NS_OK;
  }

  return QueryInterface(aIID, aResult);
}

void FetchDriver::SetDocument(Document* aDocument) {
  // Cannot set document after Fetch() has been called.
  MOZ_ASSERT(!mFetchCalled);
  mDocument = aDocument;
}

void FetchDriver::SetCSPEventListener(nsICSPEventListener* aCSPEventListener) {
  MOZ_ASSERT(!mFetchCalled);
  mCSPEventListener = aCSPEventListener;
}

void FetchDriver::SetClientInfo(const ClientInfo& aClientInfo) {
  MOZ_ASSERT(!mFetchCalled);
  mClientInfo.emplace(aClientInfo);
}

void FetchDriver::SetController(
    const Maybe<ServiceWorkerDescriptor>& aController) {
  MOZ_ASSERT(!mFetchCalled);
  mController = aController;
}

PerformanceTimingData* FetchDriver::GetPerformanceTimingData(
    nsAString& aInitiatorType, nsAString& aEntryName) {
  MOZ_ASSERT(XRE_IsParentProcess());
  if (!mChannel) {
    return nullptr;
  }

  nsCOMPtr<nsITimedChannel> timedChannel = do_QueryInterface(mChannel);
  if (!timedChannel) {
    return nullptr;
  }
  nsCOMPtr<nsIHttpChannel> httpChannel = do_QueryInterface(mChannel);
  if (!httpChannel) {
    return nullptr;
  }
  return dom::PerformanceTimingData::Create(timedChannel, httpChannel, 0,
                                            aInitiatorType, aEntryName);
}

void FetchDriver::SetRequestHeaders(nsIHttpChannel* aChannel,
                                    bool aStripRequestBodyHeader,
                                    bool aStripAuthHeader) const {
  MOZ_ASSERT(aChannel);

  // nsIHttpChannel has a set of pre-configured headers (Accept,
  // Accept-Languages, ...) and we don't want to merge the Request's headers
  // with them. This array is used to know if the current header has been aleady
  // set, if yes, we ask necko to merge it with the previous one, otherwise, we
  // don't want the merge.
  nsTArray<nsCString> headersSet;

  AutoTArray<InternalHeaders::Entry, 5> headers;
  mRequest->Headers()->GetEntries(headers);
  for (uint32_t i = 0; i < headers.Length(); ++i) {
    if (aStripRequestBodyHeader &&
        (headers[i].mName.LowerCaseEqualsASCII("content-type") ||
         headers[i].mName.LowerCaseEqualsASCII("content-encoding") ||
         headers[i].mName.LowerCaseEqualsASCII("content-language") ||
         headers[i].mName.LowerCaseEqualsASCII("content-location"))) {
      continue;
    }

    if (aStripAuthHeader &&
        headers[i].mName.LowerCaseEqualsASCII("authorization")) {
      continue;
    }

    bool alreadySet = headersSet.Contains(headers[i].mName);
    if (!alreadySet) {
      headersSet.AppendElement(headers[i].mName);
    }

    if (headers[i].mValue.IsEmpty()) {
      DebugOnly<nsresult> rv =
          aChannel->SetEmptyRequestHeader(headers[i].mName);
      MOZ_ASSERT(NS_SUCCEEDED(rv));
    } else {
      DebugOnly<nsresult> rv = aChannel->SetRequestHeader(
          headers[i].mName, headers[i].mValue, alreadySet /* merge */);
      MOZ_ASSERT(NS_SUCCEEDED(rv));
    }
  }
}

void FetchDriver::RunAbortAlgorithm() { FetchDriverAbortActions(Signal()); }

void FetchDriver::FetchDriverAbortActions(AbortSignalImpl* aSignalImpl) {
  MOZ_DIAGNOSTIC_ASSERT(NS_IsMainThread());

  if (mObserver) {
#ifdef DEBUG
    mResponseAvailableCalled = true;
#endif
    JS::Rooted<JS::Value> reason(RootingCx());
    if (aSignalImpl) {
      reason.set(aSignalImpl->RawReason());
    }
    mObserver->OnResponseEnd(FetchDriverObserver::eAborted, reason);
    // As a part of cleanup, we are not removing the mObserver reference as it
    // could race with mObserver access in OnDataAvailable when it runs OMT.
    // We will be removing the reference in the OnStopRequest which guaranteed
    // to run after cancelling the channel.
  }

  if (mChannel) {
    mChannel->CancelWithReason(NS_BINDING_ABORTED,
                               "FetchDriver::RunAbortAlgorithm"_ns);
    mChannel = nullptr;
  }

  mAborted = true;
}

}  // namespace mozilla::dom