summaryrefslogtreecommitdiffstats
path: root/dom/base/nsHostObjectProtocolHandler.cpp
blob: 1642c1cb1fdd4a8dead99a093cade8ee440acb45 (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
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 "nsHostObjectProtocolHandler.h"

#include "DOMMediaStream.h"
#include "mozilla/dom/ContentChild.h"
#include "mozilla/dom/ContentParent.h"
#include "mozilla/dom/Exceptions.h"
#include "mozilla/dom/File.h"
#include "mozilla/dom/ipc/BlobChild.h"
#include "mozilla/dom/ipc/BlobParent.h"
#include "mozilla/dom/MediaSource.h"
#include "mozilla/LoadInfo.h"
#include "mozilla/ModuleUtils.h"
#include "mozilla/Preferences.h"
#include "nsClassHashtable.h"
#include "nsContentUtils.h"
#include "nsError.h"
#include "nsHostObjectURI.h"
#include "nsIMemoryReporter.h"
#include "nsIPrincipal.h"
#include "nsIUUIDGenerator.h"
#include "nsNetUtil.h"

#define RELEASING_TIMER 1000

using mozilla::DOMMediaStream;
using mozilla::dom::BlobImpl;
using mozilla::dom::MediaSource;
using mozilla::ErrorResult;
using mozilla::net::LoadInfo;
using mozilla::Move;
using mozilla::Unused;

// -----------------------------------------------------------------------
// Hash table
struct DataInfo
{
  enum ObjectType {
    eBlobImpl,
    eMediaStream,
    eMediaSource
  };

  DataInfo(BlobImpl* aBlobImpl, nsIPrincipal* aPrincipal)
    : mObjectType(eBlobImpl)
    , mBlobImpl(aBlobImpl)
    , mPrincipal(aPrincipal)
  {}

  DataInfo(DOMMediaStream* aMediaStream, nsIPrincipal* aPrincipal)
    : mObjectType(eMediaStream)
    , mMediaStream(aMediaStream)
    , mPrincipal(aPrincipal)
  {}

  DataInfo(MediaSource* aMediaSource, nsIPrincipal* aPrincipal)
    : mObjectType(eMediaSource)
    , mMediaSource(aMediaSource)
    , mPrincipal(aPrincipal)
  {}

  ObjectType mObjectType;

  RefPtr<BlobImpl> mBlobImpl;
  RefPtr<DOMMediaStream> mMediaStream;
  RefPtr<MediaSource> mMediaSource;

  nsCOMPtr<nsIPrincipal> mPrincipal;
  nsCString mStack;

  // WeakReferences of nsHostObjectURI objects.
  nsTArray<nsWeakPtr> mURIs;
};

static nsClassHashtable<nsCStringHashKey, DataInfo>* gDataTable;

static DataInfo*
GetDataInfo(const nsACString& aUri)
{
  if (!gDataTable) {
    return nullptr;
  }

  DataInfo* res;

  // Let's remove any fragment and query from this URI.
  int32_t hasFragmentPos = aUri.FindChar('#');
  int32_t hasQueryPos = aUri.FindChar('?');

  int32_t pos = -1;
  if (hasFragmentPos >= 0 && hasQueryPos >= 0) {
    pos = std::min(hasFragmentPos, hasQueryPos);
  } else if (hasFragmentPos >= 0) {
    pos = hasFragmentPos;
  } else {
    pos = hasQueryPos;
  }

  if (pos < 0) {
    gDataTable->Get(aUri, &res);
  } else {
    gDataTable->Get(StringHead(aUri, pos), &res);
  }

  return res;
}

static DataInfo*
GetDataInfoFromURI(nsIURI* aURI)
{
  if (!aURI) {
    return nullptr;
  }

  nsCString spec;
  nsresult rv = aURI->GetSpec(spec);
  if (NS_WARN_IF(NS_FAILED(rv))) {
    return nullptr;
  }

  return GetDataInfo(spec);
}

// Memory reporting for the hash table.
namespace mozilla {

void
BroadcastBlobURLRegistration(const nsACString& aURI,
                             BlobImpl* aBlobImpl,
                             nsIPrincipal* aPrincipal)
{
  MOZ_ASSERT(NS_IsMainThread());
  MOZ_ASSERT(aBlobImpl);

  if (XRE_IsParentProcess()) {
    dom::ContentParent::BroadcastBlobURLRegistration(aURI, aBlobImpl,
                                                     aPrincipal);
    return;
  }

  dom::ContentChild* cc = dom::ContentChild::GetSingleton();
  dom::BlobChild* actor = cc->GetOrCreateActorForBlobImpl(aBlobImpl);
  if (NS_WARN_IF(!actor)) {
    return;
  }

  Unused << NS_WARN_IF(!cc->SendStoreAndBroadcastBlobURLRegistration(
    nsCString(aURI), actor, IPC::Principal(aPrincipal)));
}

void
BroadcastBlobURLUnregistration(const nsACString& aURI, DataInfo* aInfo)
{
  MOZ_ASSERT(aInfo);
  MOZ_ASSERT(NS_IsMainThread());

  if (XRE_IsParentProcess()) {
    dom::ContentParent::BroadcastBlobURLUnregistration(aURI);
    return;
  }

  dom::ContentChild* cc = dom::ContentChild::GetSingleton();
  Unused << NS_WARN_IF(!cc->SendUnstoreAndBroadcastBlobURLUnregistration(
    nsCString(aURI)));
}

class HostObjectURLsReporter final : public nsIMemoryReporter
{
  ~HostObjectURLsReporter() {}

 public:
  NS_DECL_ISUPPORTS

  NS_IMETHOD CollectReports(nsIHandleReportCallback* aHandleReport,
                            nsISupports* aData, bool aAnonymize) override
  {
    MOZ_COLLECT_REPORT(
      "host-object-urls", KIND_OTHER, UNITS_COUNT,
      gDataTable ? gDataTable->Count() : 0,
      "The number of host objects stored for access via URLs "
      "(e.g. blobs passed to URL.createObjectURL).");

    return NS_OK;
  }
};

NS_IMPL_ISUPPORTS(HostObjectURLsReporter, nsIMemoryReporter)

class BlobURLsReporter final : public nsIMemoryReporter
{
 public:
  NS_DECL_ISUPPORTS

  NS_IMETHOD CollectReports(nsIHandleReportCallback* aCallback,
                            nsISupports* aData, bool aAnonymize) override
  {
    if (!gDataTable) {
      return NS_OK;
    }

    nsDataHashtable<nsPtrHashKey<BlobImpl>, uint32_t> refCounts;

    // Determine number of URLs per BlobImpl, to handle the case where it's > 1.
    for (auto iter = gDataTable->Iter(); !iter.Done(); iter.Next()) {
      if (iter.UserData()->mObjectType != DataInfo::eBlobImpl) {
        continue;
      }

      BlobImpl* blobImpl = iter.UserData()->mBlobImpl;
      MOZ_ASSERT(blobImpl);

      refCounts.Put(blobImpl, refCounts.Get(blobImpl) + 1);
    }

    for (auto iter = gDataTable->Iter(); !iter.Done(); iter.Next()) {
      nsCStringHashKey::KeyType key = iter.Key();
      DataInfo* info = iter.UserData();

      if (iter.UserData()->mObjectType == DataInfo::eBlobImpl) {
        BlobImpl* blobImpl = iter.UserData()->mBlobImpl;
        MOZ_ASSERT(blobImpl);

        NS_NAMED_LITERAL_CSTRING(desc,
          "A blob URL allocated with URL.createObjectURL; the referenced "
          "blob cannot be freed until all URLs for it have been explicitly "
          "invalidated with URL.revokeObjectURL.");
        nsAutoCString path, url, owner, specialDesc;
        uint64_t size = 0;
        uint32_t refCount = 1;
        DebugOnly<bool> blobImplWasCounted;

        blobImplWasCounted = refCounts.Get(blobImpl, &refCount);
        MOZ_ASSERT(blobImplWasCounted);
        MOZ_ASSERT(refCount > 0);

        bool isMemoryFile = blobImpl->IsMemoryFile();

        if (isMemoryFile) {
          ErrorResult rv;
          size = blobImpl->GetSize(rv);
          if (NS_WARN_IF(rv.Failed())) {
            rv.SuppressException();
            size = 0;
          }
        }

        path = isMemoryFile ? "memory-blob-urls/" : "file-blob-urls/";
        BuildPath(path, key, info, aAnonymize);

        if (refCount > 1) {
          nsAutoCString addrStr;

          addrStr = "0x";
          addrStr.AppendInt((uint64_t)(BlobImpl*)blobImpl, 16);

          path += " ";
          path.AppendInt(refCount);
          path += "@";
          path += addrStr;

          specialDesc = desc;
          specialDesc += "\n\nNOTE: This blob (address ";
          specialDesc += addrStr;
          specialDesc += ") has ";
          specialDesc.AppendInt(refCount);
          specialDesc += " URLs.";
          if (isMemoryFile) {
            specialDesc += " Its size is divided ";
            specialDesc += refCount > 2 ? "among" : "between";
            specialDesc += " them in this report.";
          }
        }

        const nsACString& descString = specialDesc.IsEmpty()
            ? static_cast<const nsACString&>(desc)
            : static_cast<const nsACString&>(specialDesc);
        if (isMemoryFile) {
          aCallback->Callback(EmptyCString(),
              path,
              KIND_OTHER,
              UNITS_BYTES,
              size / refCount,
              descString,
              aData);
        } else {
          aCallback->Callback(EmptyCString(),
              path,
              KIND_OTHER,
              UNITS_COUNT,
              1,
              descString,
              aData);
        }
        continue;
      }

      // Just report the path for the DOMMediaStream or MediaSource.
      nsAutoCString path;
      path = iter.UserData()->mObjectType == DataInfo::eMediaSource
               ? "media-source-urls/" : "dom-media-stream-urls/";
      BuildPath(path, key, info, aAnonymize);

      NS_NAMED_LITERAL_CSTRING(desc,
        "An object URL allocated with URL.createObjectURL; the referenced "
        "data cannot be freed until all URLs for it have been explicitly "
        "invalidated with URL.revokeObjectURL.");

      aCallback->Callback(EmptyCString(), path, KIND_OTHER, UNITS_COUNT, 1,
                          desc, aData);
    }

    return NS_OK;
  }

  // Initialize info->mStack to record JS stack info, if enabled.
  // The string generated here is used in ReportCallback, below.
  static void GetJSStackForBlob(DataInfo* aInfo)
  {
    nsCString& stack = aInfo->mStack;
    MOZ_ASSERT(stack.IsEmpty());
    const uint32_t maxFrames = Preferences::GetUint("memory.blob_report.stack_frames");

    if (maxFrames == 0) {
      return;
    }

    nsCOMPtr<nsIStackFrame> frame = dom::GetCurrentJSStack(maxFrames);

    nsAutoCString origin;
    nsCOMPtr<nsIURI> principalURI;
    if (NS_SUCCEEDED(aInfo->mPrincipal->GetURI(getter_AddRefs(principalURI)))
        && principalURI) {
      principalURI->GetPrePath(origin);
    }

    // If we got a frame, we better have a current JSContext.  This is cheating
    // a bit; ideally we'd have our caller pass in a JSContext, or have
    // GetCurrentJSStack() hand out the JSContext it found.
    JSContext* cx = frame ? nsContentUtils::GetCurrentJSContext() : nullptr;

    for (uint32_t i = 0; frame; ++i) {
      nsString fileNameUTF16;
      int32_t lineNumber = 0;

      frame->GetFilename(cx, fileNameUTF16);
      frame->GetLineNumber(cx, &lineNumber);

      if (!fileNameUTF16.IsEmpty()) {
        NS_ConvertUTF16toUTF8 fileName(fileNameUTF16);
        stack += "js(";
        if (!origin.IsEmpty()) {
          // Make the file name root-relative for conciseness if possible.
          const char* originData;
          uint32_t originLen;

          originLen = origin.GetData(&originData);
          // If fileName starts with origin + "/", cut up to that "/".
          if (fileName.Length() >= originLen + 1 &&
              memcmp(fileName.get(), originData, originLen) == 0 &&
              fileName[originLen] == '/') {
            fileName.Cut(0, originLen);
          }
        }
        fileName.ReplaceChar('/', '\\');
        stack += fileName;
        if (lineNumber > 0) {
          stack += ", line=";
          stack.AppendInt(lineNumber);
        }
        stack += ")/";
      }

      nsCOMPtr<nsIStackFrame> caller;
      nsresult rv = frame->GetCaller(cx, getter_AddRefs(caller));
      NS_ENSURE_SUCCESS_VOID(rv);
      caller.swap(frame);
    }
  }

 private:
  ~BlobURLsReporter() {}

  static void BuildPath(nsAutoCString& path,
                        nsCStringHashKey::KeyType aKey,
                        DataInfo* aInfo,
                        bool anonymize)
  {
    nsCOMPtr<nsIURI> principalURI;
    nsAutoCString url, owner;
    if (NS_SUCCEEDED(aInfo->mPrincipal->GetURI(getter_AddRefs(principalURI))) &&
        principalURI != nullptr &&
        NS_SUCCEEDED(principalURI->GetSpec(owner)) &&
        !owner.IsEmpty()) {
      owner.ReplaceChar('/', '\\');
      path += "owner(";
      if (anonymize) {
        path += "<anonymized>";
      } else {
        path += owner;
      }
      path += ")";
    } else {
      path += "owner unknown";
    }
    path += "/";
    if (anonymize) {
      path += "<anonymized-stack>";
    } else {
      path += aInfo->mStack;
    }
    url = aKey;
    url.ReplaceChar('/', '\\');
    if (anonymize) {
      path += "<anonymized-url>";
    } else {
      path += url;
    }
  }
};

NS_IMPL_ISUPPORTS(BlobURLsReporter, nsIMemoryReporter)

class ReleasingTimerHolder final : public nsITimerCallback
{
public:
  NS_DECL_ISUPPORTS

  static void
  Create(nsTArray<nsWeakPtr>&& aArray)
  {
    RefPtr<ReleasingTimerHolder> holder = new ReleasingTimerHolder(Move(aArray));
    holder->mTimer = do_CreateInstance(NS_TIMER_CONTRACTID);

    // If we are shutting down, we are not able to create a timer.
    if (!holder->mTimer) {
      return;
    }

    nsresult rv = holder->mTimer->InitWithCallback(holder, RELEASING_TIMER,
                                                   nsITimer::TYPE_ONE_SHOT);
    NS_ENSURE_SUCCESS_VOID(rv);
  }

  NS_IMETHOD
  Notify(nsITimer* aTimer) override
  {
    for (uint32_t i = 0; i < mURIs.Length(); ++i) {
      nsCOMPtr<nsIURI> uri = do_QueryReferent(mURIs[i]);
      if (uri) {
        static_cast<nsHostObjectURI*>(uri.get())->ForgetBlobImpl();
      }
    }

    return NS_OK;
  }

private:
  explicit ReleasingTimerHolder(nsTArray<nsWeakPtr>&& aArray)
    : mURIs(aArray)
  {}

  ~ReleasingTimerHolder()
  {}

  nsTArray<nsWeakPtr> mURIs;
  nsCOMPtr<nsITimer> mTimer;
};

NS_IMPL_ISUPPORTS(ReleasingTimerHolder, nsITimerCallback)

} // namespace mozilla

template<typename T>
static nsresult
AddDataEntryInternal(const nsACString& aURI, T aObject,
                     nsIPrincipal* aPrincipal)
{
  if (!gDataTable) {
    gDataTable = new nsClassHashtable<nsCStringHashKey, DataInfo>;
  }

  DataInfo* info = new DataInfo(aObject, aPrincipal);
  mozilla::BlobURLsReporter::GetJSStackForBlob(info);

  gDataTable->Put(aURI, info);
  return NS_OK;
}

void
nsHostObjectProtocolHandler::Init(void)
{
  static bool initialized = false;

  if (!initialized) {
    initialized = true;
    RegisterStrongMemoryReporter(new mozilla::HostObjectURLsReporter());
    RegisterStrongMemoryReporter(new mozilla::BlobURLsReporter());
  }
}

nsHostObjectProtocolHandler::nsHostObjectProtocolHandler()
{
  Init();
}

/* static */ nsresult
nsHostObjectProtocolHandler::AddDataEntry(BlobImpl* aBlobImpl,
                                          nsIPrincipal* aPrincipal,
                                          nsACString& aUri)
{
  Init();

  nsresult rv = GenerateURIStringForBlobURL(aPrincipal, aUri);
  NS_ENSURE_SUCCESS(rv, rv);

  rv = AddDataEntryInternal(aUri, aBlobImpl, aPrincipal);
  NS_ENSURE_SUCCESS(rv, rv);

  mozilla::BroadcastBlobURLRegistration(aUri, aBlobImpl, aPrincipal);
  return NS_OK;
}

/* static */ nsresult
nsHostObjectProtocolHandler::AddDataEntry(DOMMediaStream* aMediaStream,
                                          nsIPrincipal* aPrincipal,
                                          nsACString& aUri)
{
  Init();

  nsresult rv = GenerateURIStringForBlobURL(aPrincipal, aUri);
  NS_ENSURE_SUCCESS(rv, rv);

  rv = AddDataEntryInternal(aUri, aMediaStream, aPrincipal);
  NS_ENSURE_SUCCESS(rv, rv);

  return NS_OK;
}

/* static */ nsresult
nsHostObjectProtocolHandler::AddDataEntry(MediaSource* aMediaSource,
                                          nsIPrincipal* aPrincipal,
                                          nsACString& aUri)
{
  Init();

  nsresult rv = GenerateURIStringForBlobURL(aPrincipal, aUri);
  NS_ENSURE_SUCCESS(rv, rv);

  rv = AddDataEntryInternal(aUri, aMediaSource, aPrincipal);
  NS_ENSURE_SUCCESS(rv, rv);

  return NS_OK;
}

/* static */ nsresult
nsHostObjectProtocolHandler::AddDataEntry(const nsACString& aURI,
                                          nsIPrincipal* aPrincipal,
                                          mozilla::dom::BlobImpl* aBlobImpl)
{
  return AddDataEntryInternal(aURI, aBlobImpl, aPrincipal);
}

/* static */ bool
nsHostObjectProtocolHandler::GetAllBlobURLEntries(
  nsTArray<mozilla::dom::BlobURLRegistrationData>& aRegistrations,
  mozilla::dom::ContentParent* aCP)
{
  MOZ_ASSERT(aCP);

  if (!gDataTable) {
    return true;
  }

  for (auto iter = gDataTable->ConstIter(); !iter.Done(); iter.Next()) {
    DataInfo* info = iter.UserData();
    MOZ_ASSERT(info);

    if (info->mObjectType != DataInfo::eBlobImpl) {
      continue;
    }

    MOZ_ASSERT(info->mBlobImpl);
    mozilla::dom::PBlobParent* blobParent =
      aCP->GetOrCreateActorForBlobImpl(info->mBlobImpl);
    if (!blobParent) {
      return false;
    }

    aRegistrations.AppendElement(mozilla::dom::BlobURLRegistrationData(
      nsCString(iter.Key()), blobParent, nullptr,
      IPC::Principal(info->mPrincipal)));
  }

  return true;
}

/*static */ void
nsHostObjectProtocolHandler::RemoveDataEntry(const nsACString& aUri,
                                             bool aBroadcastToOtherProcesses)
{
  if (!gDataTable) {
    return;
  }

  DataInfo* info = GetDataInfo(aUri);
  if (!info) {
    return;
  }

  if (aBroadcastToOtherProcesses && info->mObjectType == DataInfo::eBlobImpl) {
    mozilla::BroadcastBlobURLUnregistration(aUri, info);
  }

  if (!info->mURIs.IsEmpty()) {
    mozilla::ReleasingTimerHolder::Create(Move(info->mURIs));
  }

  gDataTable->Remove(aUri);
  if (gDataTable->Count() == 0) {
    delete gDataTable;
    gDataTable = nullptr;
  }
}

/* static */ void
nsHostObjectProtocolHandler::RemoveDataEntries()
{
  MOZ_ASSERT(XRE_IsContentProcess());

  if (!gDataTable) {
    return;
  }

  gDataTable->Clear();
  delete gDataTable;
  gDataTable = nullptr;
}

/* static */ bool
nsHostObjectProtocolHandler::HasDataEntry(const nsACString& aUri)
{
  return !!GetDataInfo(aUri);
}

/* static */ nsresult
nsHostObjectProtocolHandler::GenerateURIString(const nsACString &aScheme,
                                               nsIPrincipal* aPrincipal,
                                               nsACString& aUri)
{
  nsresult rv;
  nsCOMPtr<nsIUUIDGenerator> uuidgen =
    do_GetService("@mozilla.org/uuid-generator;1", &rv);
  NS_ENSURE_SUCCESS(rv, rv);

  nsID id;
  rv = uuidgen->GenerateUUIDInPlace(&id);
  NS_ENSURE_SUCCESS(rv, rv);

  char chars[NSID_LENGTH];
  id.ToProvidedString(chars);

  aUri = aScheme;
  aUri.Append(':');

  if (aPrincipal) {
    nsAutoCString origin;
    rv = nsContentUtils::GetASCIIOrigin(aPrincipal, origin);
    if (NS_WARN_IF(NS_FAILED(rv))) {
      return rv;
    }

    aUri.Append(origin);
    aUri.Append('/');
  }

  aUri += Substring(chars + 1, chars + NSID_LENGTH - 2);

  return NS_OK;
}

/* static */ nsresult
nsHostObjectProtocolHandler::GenerateURIStringForBlobURL(nsIPrincipal* aPrincipal,
                                                         nsACString& aUri)
{
  return
    GenerateURIString(NS_LITERAL_CSTRING(BLOBURI_SCHEME), aPrincipal, aUri);
}

/* static */ nsIPrincipal*
nsHostObjectProtocolHandler::GetDataEntryPrincipal(const nsACString& aUri)
{
  if (!gDataTable) {
    return nullptr;
  }

  DataInfo* res = GetDataInfo(aUri);

  if (!res) {
    return nullptr;
  }

  return res->mPrincipal;
}

/* static */ void
nsHostObjectProtocolHandler::Traverse(const nsACString& aUri,
                                      nsCycleCollectionTraversalCallback& aCallback)
{
  if (!gDataTable) {
    return;
  }

  DataInfo* res;
  gDataTable->Get(aUri, &res);
  if (!res) {
    return;
  }

  NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(aCallback, "HostObjectProtocolHandler DataInfo.mBlobImpl");
  aCallback.NoteXPCOMChild(res->mBlobImpl);

  NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(aCallback, "HostObjectProtocolHandler DataInfo.mMediaSource");
  aCallback.NoteXPCOMChild(res->mMediaSource);

  NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(aCallback, "HostObjectProtocolHandler DataInfo.mMediaStream");
  aCallback.NoteXPCOMChild(res->mMediaStream);
}

// -----------------------------------------------------------------------
// Protocol handler

NS_IMPL_ISUPPORTS(nsHostObjectProtocolHandler, nsIProtocolHandler)

NS_IMETHODIMP
nsHostObjectProtocolHandler::GetDefaultPort(int32_t *result)
{
  *result = -1;
  return NS_OK;
}

NS_IMETHODIMP
nsHostObjectProtocolHandler::GetProtocolFlags(uint32_t *result)
{
  *result = URI_NORELATIVE | URI_NOAUTH | URI_LOADABLE_BY_SUBSUMERS |
            URI_NON_PERSISTABLE;
  return NS_OK;
}

NS_IMETHODIMP
nsHostObjectProtocolHandler::GetFlagsForURI(nsIURI *aURI, uint32_t *aResult)
{
  Unused << nsHostObjectProtocolHandler::GetProtocolFlags(aResult);
  if (IsFontTableURI(aURI) || IsBlobURI(aURI)) {
    *aResult |= URI_IS_LOCAL_RESOURCE;
  }

  return NS_OK;
}

NS_IMETHODIMP
nsBlobProtocolHandler::GetProtocolFlags(uint32_t *result)
{
  Unused << nsHostObjectProtocolHandler::GetProtocolFlags(result);
  *result |= URI_IS_LOCAL_RESOURCE;
  return NS_OK;
}

NS_IMETHODIMP
nsHostObjectProtocolHandler::NewURI(const nsACString& aSpec,
                                    const char *aCharset,
                                    nsIURI *aBaseURI,
                                    nsIURI **aResult)
{
  *aResult = nullptr;
  nsresult rv;

  DataInfo* info = GetDataInfo(aSpec);

  RefPtr<nsHostObjectURI> uri;
  if (info && info->mObjectType == DataInfo::eBlobImpl) {
    MOZ_ASSERT(info->mBlobImpl);
    uri = new nsHostObjectURI(info->mPrincipal, info->mBlobImpl);
  } else {
    uri = new nsHostObjectURI(nullptr, nullptr);
  }

  rv = uri->SetSpec(aSpec);
  NS_ENSURE_SUCCESS(rv, rv);

  NS_TryToSetImmutable(uri);
  uri.forget(aResult);

  if (info && info->mObjectType == DataInfo::eBlobImpl) {
    info->mURIs.AppendElement(do_GetWeakReference(*aResult));
  }

  return NS_OK;
}

NS_IMETHODIMP
nsHostObjectProtocolHandler::NewChannel2(nsIURI* uri,
                                         nsILoadInfo* aLoadInfo,
                                         nsIChannel** result)
{
  *result = nullptr;

  nsCOMPtr<nsIURIWithBlobImpl> uriBlobImpl = do_QueryInterface(uri);
  if (!uriBlobImpl) {
    return NS_ERROR_DOM_BAD_URI;
  }

  nsCOMPtr<nsISupports> tmp;
  MOZ_ALWAYS_SUCCEEDS(uriBlobImpl->GetBlobImpl(getter_AddRefs(tmp)));
  nsCOMPtr<BlobImpl> blobImpl = do_QueryInterface(tmp);
  if (!blobImpl) {
    return NS_ERROR_DOM_BAD_URI;
  }

#ifdef DEBUG
  DataInfo* info = GetDataInfoFromURI(uri);

  // Info can be null, in case this blob URL has been revoked already.
  if (info) {
    nsCOMPtr<nsIURIWithPrincipal> uriPrinc = do_QueryInterface(uri);
    nsCOMPtr<nsIPrincipal> principal;
    uriPrinc->GetPrincipal(getter_AddRefs(principal));
    NS_ASSERTION(info->mPrincipal == principal, "Wrong principal!");
  }
#endif

  ErrorResult rv;
  nsCOMPtr<nsIInputStream> stream;
  blobImpl->GetInternalStream(getter_AddRefs(stream), rv);
  if (NS_WARN_IF(rv.Failed())) {
    return rv.StealNSResult();
  }

  nsAutoString contentType;
  blobImpl->GetType(contentType);

  nsCOMPtr<nsIChannel> channel;
  rv = NS_NewInputStreamChannelInternal(getter_AddRefs(channel),
                                        uri,
                                        stream,
                                        NS_ConvertUTF16toUTF8(contentType),
                                        EmptyCString(), // aContentCharset
                                        aLoadInfo);
  if (NS_WARN_IF(rv.Failed())) {
    return rv.StealNSResult();
  }

  if (blobImpl->IsFile()) {
    nsString filename;
    blobImpl->GetName(filename);
    channel->SetContentDispositionFilename(filename);
  }

  uint64_t size = blobImpl->GetSize(rv);
  if (NS_WARN_IF(rv.Failed())) {
    return rv.StealNSResult();
  }

  channel->SetOriginalURI(uri);
  channel->SetContentType(NS_ConvertUTF16toUTF8(contentType));
  channel->SetContentLength(size);

  channel.forget(result);

  return NS_OK;
}

NS_IMETHODIMP
nsHostObjectProtocolHandler::NewChannel(nsIURI* uri, nsIChannel* *result)
{
  return NewChannel2(uri, nullptr, result);
}

NS_IMETHODIMP
nsHostObjectProtocolHandler::AllowPort(int32_t port, const char *scheme,
                                       bool *_retval)
{
  // don't override anything.
  *_retval = false;
  return NS_OK;
}

NS_IMETHODIMP
nsBlobProtocolHandler::GetScheme(nsACString &result)
{
  result.AssignLiteral(BLOBURI_SCHEME);
  return NS_OK;
}

NS_IMETHODIMP
nsFontTableProtocolHandler::GetProtocolFlags(uint32_t *result)
{
  Unused << nsHostObjectProtocolHandler::GetProtocolFlags(result);
  *result |= URI_IS_LOCAL_RESOURCE;
  return NS_OK;
}

NS_IMETHODIMP
nsFontTableProtocolHandler::GetScheme(nsACString &result)
{
  result.AssignLiteral(FONTTABLEURI_SCHEME);
  return NS_OK;
}

nsresult
NS_GetBlobForBlobURI(nsIURI* aURI, BlobImpl** aBlob)
{
  NS_ASSERTION(IsBlobURI(aURI), "Only call this with blob URIs");

  *aBlob = nullptr;

  DataInfo* info = GetDataInfoFromURI(aURI);
  if (!info || info->mObjectType != DataInfo::eBlobImpl) {
    return NS_ERROR_DOM_BAD_URI;
  }

  RefPtr<BlobImpl> blob = info->mBlobImpl;
  blob.forget(aBlob);
  return NS_OK;
}

nsresult
NS_GetBlobForBlobURISpec(const nsACString& aSpec, BlobImpl** aBlob)
{
  *aBlob = nullptr;

  DataInfo* info = GetDataInfo(aSpec);
  if (!info || info->mObjectType != DataInfo::eBlobImpl) {
    return NS_ERROR_DOM_BAD_URI;
  }

  RefPtr<BlobImpl> blob = info->mBlobImpl;
  blob.forget(aBlob);
  return NS_OK;
}

nsresult
NS_GetStreamForBlobURI(nsIURI* aURI, nsIInputStream** aStream)
{
  RefPtr<BlobImpl> blobImpl;
  ErrorResult rv;
  rv = NS_GetBlobForBlobURI(aURI, getter_AddRefs(blobImpl));
  if (NS_WARN_IF(rv.Failed())) {
    return rv.StealNSResult();
  }

  blobImpl->GetInternalStream(aStream, rv);
  if (NS_WARN_IF(rv.Failed())) {
    return rv.StealNSResult();
  }

  return NS_OK;
}

nsresult
NS_GetStreamForMediaStreamURI(nsIURI* aURI, mozilla::DOMMediaStream** aStream)
{
  NS_ASSERTION(IsMediaStreamURI(aURI), "Only call this with mediastream URIs");

  DataInfo* info = GetDataInfoFromURI(aURI);
  if (!info || info->mObjectType != DataInfo::eMediaStream) {
    return NS_ERROR_DOM_BAD_URI;
  }

  RefPtr<DOMMediaStream> mediaStream = info->mMediaStream;
  mediaStream.forget(aStream);
  return NS_OK;
}

NS_IMETHODIMP
nsFontTableProtocolHandler::NewURI(const nsACString& aSpec,
                                   const char *aCharset,
                                   nsIURI *aBaseURI,
                                   nsIURI **aResult)
{
  RefPtr<nsIURI> uri;

  // Either you got here via a ref or a fonttable: uri
  if (aSpec.Length() && aSpec.CharAt(0) == '#') {
    nsresult rv = aBaseURI->CloneIgnoringRef(getter_AddRefs(uri));
    NS_ENSURE_SUCCESS(rv, rv);

    uri->SetRef(aSpec);
  } else {
    // Relative URIs (other than #ref) are not meaningful within the
    // fonttable: scheme.
    // If aSpec is a relative URI -other- than a bare #ref,
    // this will leave uri empty, and we'll return a failure code below.
    uri = new mozilla::net::nsSimpleURI();
    nsresult rv = uri->SetSpec(aSpec);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  bool schemeIs;
  if (NS_FAILED(uri->SchemeIs(FONTTABLEURI_SCHEME, &schemeIs)) || !schemeIs) {
    NS_WARNING("Non-fonttable spec in nsFontTableProtocolHander");
    return NS_ERROR_NOT_AVAILABLE;
  }

  uri.forget(aResult);
  return NS_OK;
}

nsresult
NS_GetSourceForMediaSourceURI(nsIURI* aURI, mozilla::dom::MediaSource** aSource)
{
  NS_ASSERTION(IsMediaSourceURI(aURI), "Only call this with mediasource URIs");

  *aSource = nullptr;

  DataInfo* info = GetDataInfoFromURI(aURI);
  if (!info || info->mObjectType != DataInfo::eMediaSource) {
    return NS_ERROR_DOM_BAD_URI;
  }

  RefPtr<MediaSource> mediaSource = info->mMediaSource;
  mediaSource.forget(aSource);
  return NS_OK;
}

#define NS_BLOBPROTOCOLHANDLER_CID \
{ 0xb43964aa, 0xa078, 0x44b2, \
  { 0xb0, 0x6b, 0xfd, 0x4d, 0x1b, 0x17, 0x2e, 0x66 } }

#define NS_FONTTABLEPROTOCOLHANDLER_CID \
{ 0x3fc8f04e, 0xd719, 0x43ca, \
  { 0x9a, 0xd0, 0x18, 0xee, 0x32, 0x02, 0x11, 0xf2 } }

NS_GENERIC_FACTORY_CONSTRUCTOR(nsBlobProtocolHandler)
NS_GENERIC_FACTORY_CONSTRUCTOR(nsFontTableProtocolHandler)

NS_DEFINE_NAMED_CID(NS_BLOBPROTOCOLHANDLER_CID);
NS_DEFINE_NAMED_CID(NS_FONTTABLEPROTOCOLHANDLER_CID);

static const mozilla::Module::CIDEntry kHostObjectProtocolHandlerCIDs[] = {
  { &kNS_BLOBPROTOCOLHANDLER_CID, false, nullptr, nsBlobProtocolHandlerConstructor },
  { &kNS_FONTTABLEPROTOCOLHANDLER_CID, false, nullptr, nsFontTableProtocolHandlerConstructor },
  { nullptr }
};

static const mozilla::Module::ContractIDEntry kHostObjectProtocolHandlerContracts[] = {
  { NS_NETWORK_PROTOCOL_CONTRACTID_PREFIX BLOBURI_SCHEME, &kNS_BLOBPROTOCOLHANDLER_CID },
  { NS_NETWORK_PROTOCOL_CONTRACTID_PREFIX FONTTABLEURI_SCHEME, &kNS_FONTTABLEPROTOCOLHANDLER_CID },
  { nullptr }
};

static const mozilla::Module kHostObjectProtocolHandlerModule = {
  mozilla::Module::kVersion,
  kHostObjectProtocolHandlerCIDs,
  kHostObjectProtocolHandlerContracts
};

NSMODULE_DEFN(HostObjectProtocolHandler) = &kHostObjectProtocolHandlerModule;

bool IsType(nsIURI* aUri, DataInfo::ObjectType aType)
{
  DataInfo* info = GetDataInfoFromURI(aUri);
  if (!info) {
    return false;
  }

  return info->mObjectType == aType;
}

bool IsBlobURI(nsIURI* aUri)
{
  return IsType(aUri, DataInfo::eBlobImpl);
}

bool IsMediaStreamURI(nsIURI* aUri)
{
  return IsType(aUri, DataInfo::eMediaStream);
}

bool IsMediaSourceURI(nsIURI* aUri)
{
  return IsType(aUri, DataInfo::eMediaSource);
}