File: XMLHttpRequestMainThread.h

package info (click to toggle)
thunderbird 1:60.8.0-1~deb9u1
  • links: PTS, VCS
  • area: main
  • in suites: stretch
  • size: 2,339,208 kB
  • sloc: cpp: 5,456,704; ansic: 2,360,384; python: 596,095; asm: 340,963; java: 326,291; xml: 258,664; sh: 84,366; makefile: 23,702; perl: 17,317; objc: 3,768; yacc: 1,766; ada: 1,681; lex: 1,364; pascal: 1,264; cs: 879; exp: 527; php: 436; lisp: 258; ruby: 153; awk: 152; sed: 53; csh: 27
file content (803 lines) | stat: -rw-r--r-- 25,455 bytes parent folder | download | duplicates (7)
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
/* -*- 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/. */

#ifndef mozilla_dom_XMLHttpRequestMainThread_h
#define mozilla_dom_XMLHttpRequestMainThread_h

#include <bitset>
#include "nsAutoPtr.h"
#include "nsISupportsUtils.h"
#include "nsIURI.h"
#include "nsIHttpChannel.h"
#include "nsIDocument.h"
#include "nsIStreamListener.h"
#include "nsIChannelEventSink.h"
#include "nsIAsyncVerifyRedirectCallback.h"
#include "nsIInterfaceRequestor.h"
#include "nsIHttpHeaderVisitor.h"
#include "nsIProgressEventSink.h"
#include "nsJSUtils.h"
#include "nsTArray.h"
#include "nsITimer.h"
#include "nsIPrincipal.h"
#include "nsIScriptObjectPrincipal.h"
#include "nsISizeOfEventTarget.h"
#include "nsIXPConnect.h"
#include "nsIInputStream.h"
#include "mozilla/Assertions.h"
#include "mozilla/Attributes.h"
#include "mozilla/DOMEventTargetHelper.h"
#include "mozilla/Maybe.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/NotNull.h"
#include "mozilla/dom/MutableBlobStorage.h"
#include "mozilla/dom/BodyExtractor.h"
#include "mozilla/dom/ClientInfo.h"
#include "mozilla/dom/TypedArray.h"
#include "mozilla/dom/File.h"
#include "mozilla/dom/FormData.h"
#include "mozilla/dom/PerformanceStorage.h"
#include "mozilla/dom/ServiceWorkerDescriptor.h"
#include "mozilla/dom/URLSearchParams.h"
#include "mozilla/dom/XMLHttpRequest.h"
#include "mozilla/dom/XMLHttpRequestBinding.h"
#include "mozilla/dom/XMLHttpRequestEventTarget.h"
#include "mozilla/dom/XMLHttpRequestString.h"
#include "mozilla/Encoding.h"

#ifdef Status
/* Xlib headers insist on this for some reason... Nuke it because
   it'll override our member name */
#undef Status
#endif

class nsIJARChannel;
class nsILoadGroup;
class nsIJSID;

namespace mozilla {
namespace dom {

class BlobSet;
class DOMString;
class XMLHttpRequestUpload;
struct OriginAttributesDictionary;

// A helper for building up an ArrayBuffer object's data
// before creating the ArrayBuffer itself.  Will do doubling
// based reallocation, up to an optional maximum growth given.
//
// When all the data has been appended, call getArrayBuffer,
// passing in the JSContext* for which the ArrayBuffer object
// is to be created.  This also implicitly resets the builder,
// or it can be reset explicitly at any point by calling reset().
class ArrayBufferBuilder {
  uint8_t* mDataPtr;
  uint32_t mCapacity;
  uint32_t mLength;
  void* mMapPtr;

 public:
  ArrayBufferBuilder();
  ~ArrayBufferBuilder();

  void reset();

  // Will truncate if aNewCap is < length().
  bool setCapacity(uint32_t aNewCap);

  // Append aDataLen bytes from data to the current buffer.  If we
  // need to grow the buffer, grow by doubling the size up to a
  // maximum of aMaxGrowth (if given).  If aDataLen is greater than
  // what the new capacity would end up as, then grow by aDataLen.
  //
  // The data parameter must not overlap with anything beyond the
  // builder's current valid contents [0..length)
  bool append(const uint8_t* aNewData, uint32_t aDataLen,
              uint32_t aMaxGrowth = 0);

  uint32_t length() { return mLength; }
  uint32_t capacity() { return mCapacity; }

  JSObject* getArrayBuffer(JSContext* aCx);

  // Memory mapping to starting position of file(aFile) in the zip
  // package(aJarFile).
  //
  // The file in the zip package has to be uncompressed and the starting
  // position of the file must be aligned according to array buffer settings
  // in JS engine.
  nsresult mapToFileInPackage(const nsCString& aFile, nsIFile* aJarFile);

 protected:
  static bool areOverlappingRegions(const uint8_t* aStart1, uint32_t aLength1,
                                    const uint8_t* aStart2, uint32_t aLength2);
};

class nsXMLHttpRequestXPCOMifier;

class RequestHeaders {
  struct RequestHeader {
    nsCString mName;
    nsCString mValue;
  };
  nsTArray<RequestHeader> mHeaders;
  RequestHeader* Find(const nsACString& aName);

 public:
  class CharsetIterator {
    bool mValid;
    int32_t mCurPos, mCurLen, mCutoff;
    nsACString& mSource;

   public:
    explicit CharsetIterator(nsACString& aSource);
    bool Equals(const nsACString& aOther,
                const nsCStringComparator& aCmp) const;
    void Replace(const nsACString& aReplacement);
    bool Next();
  };

  bool Has(const char* aName);
  bool Has(const nsACString& aName);
  void Get(const char* aName, nsACString& aValue);
  void Get(const nsACString& aName, nsACString& aValue);
  void Set(const char* aName, const nsACString& aValue);
  void Set(const nsACString& aName, const nsACString& aValue);
  void MergeOrSet(const char* aName, const nsACString& aValue);
  void MergeOrSet(const nsACString& aName, const nsACString& aValue);
  void Clear();
  void ApplyToChannel(nsIHttpChannel* aChannel) const;
  void GetCORSUnsafeHeaders(nsTArray<nsCString>& aArray) const;
};

class nsXHRParseEndListener;

// Make sure that any non-DOM interfaces added here are also added to
// nsXMLHttpRequestXPCOMifier.
class XMLHttpRequestMainThread final : public XMLHttpRequest,
                                       public nsIStreamListener,
                                       public nsIChannelEventSink,
                                       public nsIProgressEventSink,
                                       public nsIInterfaceRequestor,
                                       public nsITimerCallback,
                                       public nsISizeOfEventTarget,
                                       public nsINamed,
                                       public MutableBlobStorageCallback {
  friend class nsXHRParseEndListener;
  friend class nsXMLHttpRequestXPCOMifier;

 public:
  enum class ProgressEventType : uint8_t {
    loadstart,
    progress,
    error,
    abort,
    timeout,
    load,
    loadend,
    ENUM_MAX
  };

  enum class ErrorType : uint16_t {
    eOK,
    eRequest,
    eUnreachable,
    eChannelOpen,
    eRedirect,
    eTerminated,
    ENUM_MAX
  };

  XMLHttpRequestMainThread();

  void Construct(nsIPrincipal* aPrincipal, nsIGlobalObject* aGlobalObject,
                 nsIURI* aBaseURI = nullptr, nsILoadGroup* aLoadGroup = nullptr,
                 PerformanceStorage* aPerformanceStorage = nullptr) {
    MOZ_ASSERT(aPrincipal);
    mPrincipal = aPrincipal;
    BindToOwner(aGlobalObject);
    mBaseURI = aBaseURI;
    mLoadGroup = aLoadGroup;
    mPerformanceStorage = aPerformanceStorage;
  }

  void InitParameters(bool aAnon, bool aSystem);

  void SetParameters(bool aAnon, bool aSystem) {
    mIsAnon = aAnon || aSystem;
    mIsSystem = aSystem;
  }

  void SetClientInfoAndController(
      const ClientInfo& aClientInfo,
      const Maybe<ServiceWorkerDescriptor>& aController);

  NS_DECL_ISUPPORTS_INHERITED

  // nsIStreamListener
  NS_DECL_NSISTREAMLISTENER

  // nsIRequestObserver
  NS_DECL_NSIREQUESTOBSERVER

  // nsIChannelEventSink
  NS_DECL_NSICHANNELEVENTSINK

  // nsIProgressEventSink
  NS_DECL_NSIPROGRESSEVENTSINK

  // nsIInterfaceRequestor
  NS_DECL_NSIINTERFACEREQUESTOR

  // nsITimerCallback
  NS_DECL_NSITIMERCALLBACK

  // nsINamed
  NS_DECL_NSINAMED

  // nsISizeOfEventTarget
  virtual size_t SizeOfEventTargetIncludingThis(
      MallocSizeOf aMallocSizeOf) const override;

  NS_REALLY_FORWARD_NSIDOMEVENTTARGET(XMLHttpRequestEventTarget)

  // states
  virtual uint16_t ReadyState() const override;

  // request
  nsresult CreateChannel();
  nsresult InitiateFetch(already_AddRefed<nsIInputStream> aUploadStream,
                         int64_t aUploadLength, nsACString& aUploadContentType);

  virtual void Open(const nsACString& aMethod, const nsAString& aUrl,
                    ErrorResult& aRv) override;

  virtual void Open(const nsACString& aMethod, const nsAString& aUrl,
                    bool aAsync, const nsAString& aUsername,
                    const nsAString& aPassword, ErrorResult& aRv) override;

  nsresult Open(const nsACString& aMethod, const nsACString& aUrl, bool aAsync,
                const nsAString& aUsername, const nsAString& aPassword);

  virtual void SetRequestHeader(const nsACString& aName,
                                const nsACString& aValue,
                                ErrorResult& aRv) override;

  virtual uint32_t Timeout() const override { return mTimeoutMilliseconds; }

  virtual void SetTimeout(uint32_t aTimeout, ErrorResult& aRv) override;

  virtual bool WithCredentials() const override;

  virtual void SetWithCredentials(bool aWithCredentials,
                                  ErrorResult& aRv) override;

  virtual XMLHttpRequestUpload* GetUpload(ErrorResult& aRv) override;

 private:
  virtual ~XMLHttpRequestMainThread();

  nsresult MaybeSilentSendFailure(nsresult aRv);
  nsresult SendInternal(const BodyExtractorBase* aBody);

  bool IsCrossSiteCORSRequest() const;
  bool IsDeniedCrossSiteCORSRequest();

  // Tell our channel what network interface ID we were told to use.
  // If it's an HTTP channel and we were told to use a non-default
  // interface ID.
  void PopulateNetworkInterfaceId();

  void UnsuppressEventHandlingAndResume();

  // Check pref "dom.mapped_arraybuffer.enabled" to make sure ArrayBuffer is
  // supported.
  static bool IsMappedArrayBufferEnabled();

  // Check pref "dom.xhr.lowercase_header.enabled" to make sure lowercased
  // response header is supported.
  static bool IsLowercaseResponseHeader();

  void MaybeLowerChannelPriority();

 public:
  virtual void Send(
      JSContext* aCx,
      const Nullable<
          DocumentOrBlobOrArrayBufferViewOrArrayBufferOrFormDataOrURLSearchParamsOrUSVString>&
          aData,
      ErrorResult& aRv) override;

  virtual void SendInputStream(nsIInputStream* aInputStream,
                               ErrorResult& aRv) override {
    BodyExtractor<nsIInputStream> body(aInputStream);
    aRv = SendInternal(&body);
  }

  void RequestErrorSteps(const ProgressEventType aEventType,
                         const nsresult aOptionalException, ErrorResult& aRv);

  void Abort() {
    IgnoredErrorResult rv;
    AbortInternal(rv);
    MOZ_ASSERT(!rv.Failed());
  }

  virtual void Abort(ErrorResult& aRv) override;

  // response
  virtual void GetResponseURL(nsAString& aUrl) override;

  virtual uint32_t GetStatus(ErrorResult& aRv) override;

  virtual void GetStatusText(nsACString& aStatusText,
                             ErrorResult& aRv) override;

  virtual void GetResponseHeader(const nsACString& aHeader, nsACString& aResult,
                                 ErrorResult& aRv) override;

  void GetResponseHeader(const nsAString& aHeader, nsAString& aResult,
                         ErrorResult& aRv) {
    nsAutoCString result;
    GetResponseHeader(NS_ConvertUTF16toUTF8(aHeader), result, aRv);
    if (result.IsVoid()) {
      aResult.SetIsVoid(true);
    } else {
      // The result value should be inflated:
      CopyASCIItoUTF16(result, aResult);
    }
  }

  virtual void GetAllResponseHeaders(nsACString& aResponseHeaders,
                                     ErrorResult& aRv) override;

  bool IsSafeHeader(const nsACString& aHeaderName,
                    NotNull<nsIHttpChannel*> aHttpChannel) const;

  virtual void OverrideMimeType(const nsAString& aMimeType,
                                ErrorResult& aRv) override;

  virtual XMLHttpRequestResponseType ResponseType() const override {
    return XMLHttpRequestResponseType(mResponseType);
  }

  virtual void SetResponseType(XMLHttpRequestResponseType aType,
                               ErrorResult& aRv) override;

  virtual void GetResponse(JSContext* aCx,
                           JS::MutableHandle<JS::Value> aResponse,
                           ErrorResult& aRv) override;

  virtual void GetResponseText(DOMString& aResponseText,
                               ErrorResult& aRv) override;

  void GetResponseText(XMLHttpRequestStringSnapshot& aSnapshot,
                       ErrorResult& aRv);

  virtual nsIDocument* GetResponseXML(ErrorResult& aRv) override;

  virtual bool MozBackgroundRequest() const override;

  nsresult SetMozBackgroundRequest(bool aMozBackgroundRequest);

  virtual void SetMozBackgroundRequest(bool aMozBackgroundRequest,
                                       ErrorResult& aRv) override;

  virtual uint16_t ErrorCode() const override {
    return static_cast<uint16_t>(mErrorLoad);
  }

  virtual bool MozAnon() const override;

  virtual bool MozSystem() const override;

  virtual nsIChannel* GetChannel() const override { return mChannel; }

  virtual void GetNetworkInterfaceId(nsACString& aId) const override {
    aId = mNetworkInterfaceId;
  }

  virtual void SetNetworkInterfaceId(const nsACString& aId) override {
    mNetworkInterfaceId = aId;
  }

  // We need a GetInterface callable from JS for chrome JS
  virtual void GetInterface(JSContext* aCx, nsIJSID* aIID,
                            JS::MutableHandle<JS::Value> aRetval,
                            ErrorResult& aRv) override;

  // This fires a trusted readystatechange event, which is not cancelable and
  // doesn't bubble.
  nsresult FireReadystatechangeEvent();
  void DispatchProgressEvent(DOMEventTargetHelper* aTarget,
                             const ProgressEventType aType, int64_t aLoaded,
                             int64_t aTotal);

  // This is called by nsXULTemplateQueryProcessorXML.
  nsresult Init(nsIPrincipal* aPrincipal, nsIGlobalObject* aGlobalObject,
                nsIURI* aBaseURI, nsILoadGroup* aLoadGroup);

  void SetRequestObserver(nsIRequestObserver* aObserver);

  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_INHERITED(
      XMLHttpRequestMainThread, XMLHttpRequest)
  virtual bool IsCertainlyAliveForCC() const override;

  bool AllowUploadProgress();

  virtual void DisconnectFromOwner() override;

  static void SetDontWarnAboutSyncXHR(bool aVal) {
    sDontWarnAboutSyncXHR = aVal;
  }
  static bool DontWarnAboutSyncXHR() { return sDontWarnAboutSyncXHR; }

  virtual void SetOriginAttributes(
      const mozilla::dom::OriginAttributesDictionary& aAttrs) override;

  void BlobStoreCompleted(MutableBlobStorage* aBlobStorage, Blob* aBlob,
                          nsresult aResult) override;

  void LocalFileToBlobCompleted(Blob* aBlob);

 protected:
  nsresult DetectCharset();
  nsresult AppendToResponseText(const char* aBuffer, uint32_t aBufferLen);
  static nsresult StreamReaderFunc(nsIInputStream* in, void* closure,
                                   const char* fromRawSegment,
                                   uint32_t toOffset, uint32_t count,
                                   uint32_t* writeCount);
  nsresult CreateResponseParsedJSON(JSContext* aCx);
  // Change the state of the object with this. The broadcast argument
  // determines if the onreadystatechange listener should be called.
  nsresult ChangeState(uint16_t aState, bool aBroadcast = true);
  already_AddRefed<nsILoadGroup> GetLoadGroup() const;
  nsIURI* GetBaseURI();

  already_AddRefed<nsIHttpChannel> GetCurrentHttpChannel();
  already_AddRefed<nsIJARChannel> GetCurrentJARChannel();

  void TruncateResponseText();

  bool IsSystemXHR() const;
  bool InUploadPhase() const;

  void OnBodyParseEnd();
  void ChangeStateToDone();

  void StartProgressEventTimer();
  void StopProgressEventTimer();

  void MaybeCreateBlobStorage();

  nsresult OnRedirectVerifyCallback(nsresult result);

  void SetTimerEventTarget(nsITimer* aTimer);

  nsresult DispatchToMainThread(already_AddRefed<nsIRunnable> aRunnable);

  void DispatchOrStoreEvent(DOMEventTargetHelper* aTarget, Event* aEvent);

  already_AddRefed<nsXMLHttpRequestXPCOMifier> EnsureXPCOMifier();

  void SuspendEventDispatching();
  void ResumeEventDispatching();

  void AbortInternal(ErrorResult& aRv);

  struct PendingEvent {
    RefPtr<DOMEventTargetHelper> mTarget;
    RefPtr<Event> mEvent;
  };

  nsTArray<PendingEvent> mPendingEvents;

  nsCOMPtr<nsISupports> mContext;
  nsCOMPtr<nsIPrincipal> mPrincipal;
  nsCOMPtr<nsIChannel> mChannel;
  nsCString mRequestMethod;
  nsCOMPtr<nsIURI> mRequestURL;
  nsCOMPtr<nsIDocument> mResponseXML;

  nsCOMPtr<nsIStreamListener> mXMLParserStreamListener;

  RefPtr<PerformanceStorage> mPerformanceStorage;

  // used to implement getAllResponseHeaders()
  class nsHeaderVisitor : public nsIHttpHeaderVisitor {
    struct HeaderEntry final {
      nsCString mName;
      nsCString mValue;

      HeaderEntry(const nsACString& aName, const nsACString& aValue)
          : mName(aName), mValue(aValue) {}

      bool operator==(const HeaderEntry& aOther) const {
        return mName == aOther.mName;
      }

      bool operator<(const HeaderEntry& aOther) const {
        return mName < aOther.mName;
      }
    };

   public:
    NS_DECL_ISUPPORTS
    NS_DECL_NSIHTTPHEADERVISITOR
    nsHeaderVisitor(const XMLHttpRequestMainThread& aXMLHttpRequest,
                    NotNull<nsIHttpChannel*> aHttpChannel)
        : mXHR(aXMLHttpRequest), mHttpChannel(aHttpChannel) {}
    const nsACString& Headers() {
      for (uint32_t i = 0; i < mHeaderList.Length(); i++) {
        HeaderEntry& header = mHeaderList.ElementAt(i);

        mHeaders.Append(header.mName);
        mHeaders.AppendLiteral(": ");
        mHeaders.Append(header.mValue);
        mHeaders.AppendLiteral("\r\n");
      }
      return mHeaders;
    }

   private:
    virtual ~nsHeaderVisitor() {}

    nsTArray<HeaderEntry> mHeaderList;
    nsCString mHeaders;
    const XMLHttpRequestMainThread& mXHR;
    NotNull<nsCOMPtr<nsIHttpChannel>> mHttpChannel;
  };

  // The bytes of our response body. Only used for DEFAULT, ARRAYBUFFER and
  // BLOB responseTypes
  nsCString mResponseBody;

  // The text version of our response body. This is incrementally decoded into
  // as we receive network data. However for the DEFAULT responseType we
  // lazily decode into this from mResponseBody only when .responseText is
  // accessed.
  // Only used for DEFAULT and TEXT responseTypes.
  XMLHttpRequestString mResponseText;

  // For DEFAULT responseType we use this to keep track of how far we've
  // lazily decoded from mResponseBody to mResponseText
  uint32_t mResponseBodyDecodedPos;

  // Decoder used for decoding into mResponseText
  // Only used for DEFAULT, TEXT and JSON responseTypes.
  // In cases where we've only received half a surrogate, the decoder itself
  // carries the state to remember this. Next time we receive more data we
  // simply feed the new data into the decoder which will handle the second
  // part of the surrogate.
  mozilla::UniquePtr<mozilla::Decoder> mDecoder;

  const Encoding* mResponseCharset;

  void MatchCharsetAndDecoderToResponseDocument();

  XMLHttpRequestResponseType mResponseType;

  // It is either a cached blob-response from the last call to GetResponse,
  // but is also explicitly set in OnStopRequest.
  RefPtr<Blob> mResponseBlob;
  // We stream data to mBlobStorage when response type is "blob".
  RefPtr<MutableBlobStorage> mBlobStorage;

  nsString mOverrideMimeType;

  /**
   * The notification callbacks the channel had when Send() was
   * called.  We want to forward things here as needed.
   */
  nsCOMPtr<nsIInterfaceRequestor> mNotificationCallbacks;
  /**
   * Sink interfaces that we implement that mNotificationCallbacks may
   * want to also be notified for.  These are inited lazily if we're
   * asked for the relevant interface.
   */
  nsCOMPtr<nsIChannelEventSink> mChannelEventSink;
  nsCOMPtr<nsIProgressEventSink> mProgressEventSink;

  nsIRequestObserver* mRequestObserver;

  nsCOMPtr<nsIURI> mBaseURI;
  nsCOMPtr<nsILoadGroup> mLoadGroup;

  Maybe<ClientInfo> mClientInfo;
  Maybe<ServiceWorkerDescriptor> mController;

  uint16_t mState;

  bool mFlagSynchronous;
  bool mFlagAborted;
  bool mFlagParseBody;
  bool mFlagSyncLooping;
  bool mFlagBackgroundRequest;
  bool mFlagHadUploadListenersOnSend;
  bool mFlagACwithCredentials;
  bool mFlagTimedOut;
  bool mFlagDeleted;

  // The XHR2 spec's send() flag. Set when the XHR begins uploading, until it
  // finishes downloading (or an error/abort has occurred during either phase).
  // Used to guard against the user trying to alter headers/etc when it's too
  // late, and ensure the XHR only handles one in-flight request at once.
  bool mFlagSend;

  RefPtr<XMLHttpRequestUpload> mUpload;
  int64_t mUploadTransferred;
  int64_t mUploadTotal;
  bool mUploadComplete;
  bool mProgressSinceLastProgressEvent;

  // Timeout support
  PRTime mRequestSentTime;
  uint32_t mTimeoutMilliseconds;
  nsCOMPtr<nsITimer> mTimeoutTimer;
  void StartTimeoutTimer();
  void HandleTimeoutCallback();

  nsCOMPtr<nsIDocument> mSuspendedDoc;
  nsCOMPtr<nsIRunnable> mResumeTimeoutRunnable;

  nsCOMPtr<nsITimer> mSyncTimeoutTimer;

  enum SyncTimeoutType { eErrorOrExpired, eTimerStarted, eNoTimerNeeded };

  SyncTimeoutType MaybeStartSyncTimeoutTimer();
  void HandleSyncTimeoutTimer();
  void CancelSyncTimeoutTimer();

  ErrorType mErrorLoad;
  bool mErrorParsingXML;
  bool mWaitingForOnStopRequest;
  bool mProgressTimerIsActive;
  bool mIsHtml;
  bool mWarnAboutSyncHtml;
  int64_t mLoadTotal;  // -1 if not known.
  // Number of HTTP message body bytes received so far. This quantity is
  // in the same units as Content-Length and mLoadTotal, and hence counts
  // compressed bytes when the channel has gzip Content-Encoding. If the
  // channel does not have Content-Encoding, this will be the same as
  // mDataReceived except between the OnProgress that changes mLoadTransferred
  // and the corresponding OnDataAvailable (which changes mDataReceived).
  // Ordering of OnProgress and OnDataAvailable is undefined.
  int64_t mLoadTransferred;
  nsCOMPtr<nsITimer> mProgressNotifier;
  void HandleProgressTimerCallback();

  bool mIsSystem;
  bool mIsAnon;

  // A platform-specific identifer to represent the network interface
  // that this request is associated with.
  nsCString mNetworkInterfaceId;

  /**
   * Close the XMLHttpRequest's channels.
   */
  void CloseRequest();

  void TerminateOngoingFetch();

  /**
   * Close the XMLHttpRequest's channels and dispatch appropriate progress
   * events.
   *
   * @param aType The progress event type.
   */
  void CloseRequestWithError(const ProgressEventType aType);

  bool mFirstStartRequestSeen;
  bool mInLoadProgressEvent;

  nsCOMPtr<nsIAsyncVerifyRedirectCallback> mRedirectCallback;
  nsCOMPtr<nsIChannel> mNewRedirectChannel;

  JS::Heap<JS::Value> mResultJSON;

  ArrayBufferBuilder mArrayBufferBuilder;
  JS::Heap<JSObject*> mResultArrayBuffer;
  bool mIsMappedArrayBuffer;

  void ResetResponse();

  bool ShouldBlockAuthPrompt();

  RequestHeaders mAuthorRequestHeaders;

  // Helper object to manage our XPCOM scriptability bits
  nsXMLHttpRequestXPCOMifier* mXPCOMifier;

  // When this is set to true, the event dispatching is suspended. This is
  // useful to change the correct state when XHR is working sync.
  bool mEventDispatchingSuspended;

  // Our parse-end listener, if we are parsing.
  RefPtr<nsXHRParseEndListener> mParseEndListener;

  static bool sDontWarnAboutSyncXHR;
};

class MOZ_STACK_CLASS AutoDontWarnAboutSyncXHR {
 public:
  AutoDontWarnAboutSyncXHR()
      : mOldVal(XMLHttpRequestMainThread::DontWarnAboutSyncXHR()) {
    XMLHttpRequestMainThread::SetDontWarnAboutSyncXHR(true);
  }

  ~AutoDontWarnAboutSyncXHR() {
    XMLHttpRequestMainThread::SetDontWarnAboutSyncXHR(mOldVal);
  }

 private:
  bool mOldVal;
};

// A shim class designed to expose the non-DOM interfaces of
// XMLHttpRequest via XPCOM stuff.
class nsXMLHttpRequestXPCOMifier final : public nsIStreamListener,
                                         public nsIChannelEventSink,
                                         public nsIAsyncVerifyRedirectCallback,
                                         public nsIProgressEventSink,
                                         public nsIInterfaceRequestor,
                                         public nsITimerCallback,
                                         public nsINamed {
  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
  NS_DECL_CYCLE_COLLECTION_CLASS_AMBIGUOUS(nsXMLHttpRequestXPCOMifier,
                                           nsIStreamListener)

  explicit nsXMLHttpRequestXPCOMifier(XMLHttpRequestMainThread* aXHR)
      : mXHR(aXHR) {}

 private:
  ~nsXMLHttpRequestXPCOMifier() {
    if (mXHR) {
      mXHR->mXPCOMifier = nullptr;
    }
  }

 public:
  NS_FORWARD_NSISTREAMLISTENER(mXHR->)
  NS_FORWARD_NSIREQUESTOBSERVER(mXHR->)
  NS_FORWARD_NSICHANNELEVENTSINK(mXHR->)
  NS_FORWARD_NSIASYNCVERIFYREDIRECTCALLBACK(mXHR->)
  NS_FORWARD_NSIPROGRESSEVENTSINK(mXHR->)
  NS_FORWARD_NSITIMERCALLBACK(mXHR->)
  NS_FORWARD_NSINAMED(mXHR->)

  NS_DECL_NSIINTERFACEREQUESTOR

 private:
  RefPtr<XMLHttpRequestMainThread> mXHR;
};

class nsXHRParseEndListener : public nsIDOMEventListener {
 public:
  NS_DECL_ISUPPORTS
  NS_IMETHOD HandleEvent(nsIDOMEvent* event) override {
    if (mXHR) {
      mXHR->OnBodyParseEnd();
    }
    mXHR = nullptr;
    return NS_OK;
  }

  explicit nsXHRParseEndListener(XMLHttpRequestMainThread* aXHR) : mXHR(aXHR) {}

  void SetIsStale() { mXHR = nullptr; }

 private:
  virtual ~nsXHRParseEndListener() {}

  XMLHttpRequestMainThread* mXHR;
};

}  // namespace dom
}  // namespace mozilla

#endif  // mozilla_dom_XMLHttpRequestMainThread_h