dom/xhr/XMLHttpRequestMainThread.h
author Mike Hommey <mh+mozilla@glandium.org>
Fri, 02 Jun 2017 15:07:58 +0900
changeset 410640 f360dd9d411e7ba61531bed2c32a0981cc6c418a
parent 409743 35d360dce251045e0a9b719fca742772641bbd1b
child 412434 e155fa765af299f0e8cfb42e0a1709e5b04928b9
permissions -rw-r--r--
Bug 1369622 - Restore static asserts for lack of arguments on some macros. r=froydnj Bug 1368932 removed MOZ_STATIC_ASSERT_VALID_ARG_COUNT because it didn't actually work for large numbers of arguments. But it was kind of useful for macros that expand to something broken when they are given no variadic argument at all. Now that we have a macro that doesn't require tricks to count empty arguments lists, however, we can use straightforward static_asserts instead of a generic macro, which has the side effect of providing more context in the error message.

/* -*- 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 "nsIXMLHttpRequest.h"
#include "nsISupportsUtils.h"
#include "nsIURI.h"
#include "nsIHttpChannel.h"
#include "nsIDocument.h"
#include "nsIStreamListener.h"
#include "nsWeakReference.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/MemoryReporting.h"
#include "mozilla/NotNull.h"
#include "mozilla/dom/MutableBlobStorage.h"
#include "mozilla/dom/BodyExtractor.h"
#include "mozilla/dom/TypedArray.h"
#include "mozilla/dom/File.h"
#include "mozilla/dom/FormData.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"

#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 nsIUnicodeDecoder;
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;
};

// Make sure that any non-DOM interfaces added here are also added to
// nsXMLHttpRequestXPCOMifier.
class XMLHttpRequestMainThread final : public XMLHttpRequest,
                                       public nsIXMLHttpRequest,
                                       public nsIJSXMLHttpRequest,
                                       public nsIStreamListener,
                                       public nsIChannelEventSink,
                                       public nsIProgressEventSink,
                                       public nsIInterfaceRequestor,
                                       public nsSupportsWeakReference,
                                       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,
    ENUM_MAX
  };

  XMLHttpRequestMainThread();

  void Construct(nsIPrincipal* aPrincipal,
                 nsIGlobalObject* aGlobalObject,
                 nsIURI* aBaseURI = nullptr,
                 nsILoadGroup* aLoadGroup = nullptr)
  {
    MOZ_ASSERT(aPrincipal);
    MOZ_ASSERT_IF(nsCOMPtr<nsPIDOMWindowInner> win = do_QueryInterface(
      aGlobalObject), win->IsInnerWindow());
    mPrincipal = aPrincipal;
    BindToOwner(aGlobalObject);
    mBaseURI = aBaseURI;
    mLoadGroup = aLoadGroup;
  }

  void InitParameters(bool aAnon, bool aSystem);

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

  NS_DECL_ISUPPORTS_INHERITED

  // nsIXMLHttpRequest
  NS_DECL_NSIXMLHTTPREQUEST

  NS_FORWARD_NSIXMLHTTPREQUESTEVENTTARGET(XMLHttpRequestEventTarget::)

  // 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(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
  {
    aRv = SetRequestHeader(aName, aValue);
  }

  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 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*/, ErrorResult& aRv) override
  {
    aRv = SendInternal(nullptr);
  }

  virtual void
  Send(JSContext* /*aCx*/, const ArrayBuffer& aArrayBuffer,
       ErrorResult& aRv) override
  {
    BodyExtractor<const ArrayBuffer> body(&aArrayBuffer);
    aRv = SendInternal(&body);
  }

  virtual void
  Send(JSContext* /*aCx*/, const ArrayBufferView& aArrayBufferView,
       ErrorResult& aRv) override
  {
    BodyExtractor<const ArrayBufferView> body(&aArrayBufferView);
    aRv = SendInternal(&body);
  }

  virtual void
  Send(JSContext* /*aCx*/, Blob& aBlob, ErrorResult& aRv) override
  {
    BodyExtractor<nsIXHRSendable> body(&aBlob);
    aRv = SendInternal(&body);
  }

  virtual void Send(JSContext* /*aCx*/, URLSearchParams& aURLSearchParams,
                    ErrorResult& aRv) override
  {
    BodyExtractor<nsIXHRSendable> body(&aURLSearchParams);
    aRv = SendInternal(&body);
  }

  virtual void
  Send(JSContext* /*aCx*/, nsIDocument& aDoc, ErrorResult& aRv) override
  {
    BodyExtractor<nsIDocument> body(&aDoc);
    aRv = SendInternal(&body);
  }

  virtual void
  Send(JSContext* aCx, const nsAString& aString, ErrorResult& aRv) override
  {
    if (DOMStringIsNull(aString)) {
      Send(aCx, aRv);
    } else {
      BodyExtractor<const nsAString> body(&aString);
      aRv = SendInternal(&body);
    }
  }

  virtual void
  Send(JSContext* /*aCx*/, FormData& aFormData, ErrorResult& aRv) override
  {
    BodyExtractor<nsIXHRSendable> body(&aFormData);
    aRv = SendInternal(&body);
  }

  virtual void
  Send(JSContext* aCx, nsIInputStream* aStream, ErrorResult& aRv) override
  {
    NS_ASSERTION(aStream, "Null should go to string version");
    BodyExtractor<nsIInputStream> body(aStream);
    aRv = SendInternal(&body);
  }

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

  void
  Abort() {
    ErrorResult rv;
    Abort(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;

  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 the factory constructor.
  nsresult Init();

  nsresult init(nsIPrincipal* principal,
                nsPIDOMWindowInner* globalObject,
                nsIURI* baseURI);

  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:
  // XHR states are meant to mirror the XHR2 spec:
  //   https://xhr.spec.whatwg.org/#states
  enum class State : uint8_t {
    unsent,           // object has been constructed.
    opened,           // open() has been successfully invoked.
    headers_received, // redirects followed and response headers received.
    loading,          // response body is being received.
    done,             // data transfer concluded, whether success or error.
  };

  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);
  void CreatePartialBlob(ErrorResult& aRv);
  // Change the state of the object with this. The broadcast argument
  // determines if the onreadystatechange listener should be called.
  nsresult ChangeState(State 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);

  already_AddRefed<nsXMLHttpRequestXPCOMifier> EnsureXPCOMifier();

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

  nsCOMPtr<nsIStreamListener> mXMLParserStreamListener;

  // 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.
  nsCOMPtr<nsIUnicodeDecoder> mDecoder;

  nsCString 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;
  // We stream data to mBlobSet when response type is "moz-blob".
  nsAutoPtr<BlobSet> mBlobSet;

  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;

  State 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 mWarnAboutMultipartHtml;
  bool mWarnAboutSyncHtml;
  int64_t mLoadTotal; // -1 if not known.
  // Amount of script-exposed (i.e. after undoing gzip compresion) data
  // received.
  uint64_t mDataAvailable;
  // 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();

  /**
   * 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;

  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
{
  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_DECL_NSIINTERFACEREQUESTOR

private:
  RefPtr<XMLHttpRequestMainThread> mXHR;
};

class nsXHRParseEndListener : public nsIDOMEventListener
{
public:
  NS_DECL_ISUPPORTS
  NS_IMETHOD HandleEvent(nsIDOMEvent *event) override
  {
    nsCOMPtr<nsIXMLHttpRequest> xhr = do_QueryReferent(mXHR);
    if (xhr) {
      static_cast<XMLHttpRequestMainThread*>(xhr.get())->OnBodyParseEnd();
    }
    mXHR = nullptr;
    return NS_OK;
  }
  explicit nsXHRParseEndListener(nsIXMLHttpRequest* aXHR)
    : mXHR(do_GetWeakReference(aXHR)) {}
private:
  virtual ~nsXHRParseEndListener() {}

  nsWeakPtr mXHR;
};

} // dom namespace
} // mozilla namespace

#endif // mozilla_dom_XMLHttpRequestMainThread_h