1 files changed, 296 insertions, 0 deletions
diff --git a/image/imgRequest.h b/image/imgRequest.h
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+++ b/image/imgRequest.h
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+/* -*- Mode: C++; tab-width: 2; 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/. */
+
+#ifndef mozilla_image_imgRequest_h
+#define mozilla_image_imgRequest_h
+
+#include "nsIChannelEventSink.h"
+#include "nsIInterfaceRequestor.h"
+#include "nsIStreamListener.h"
+#include "nsIThreadRetargetableStreamListener.h"
+#include "nsIPrincipal.h"
+
+#include "nsCOMPtr.h"
+#include "nsProxyRelease.h"
+#include "nsString.h"
+#include "nsError.h"
+#include "nsIAsyncVerifyRedirectCallback.h"
+#include "mozilla/Mutex.h"
+#include "ImageCacheKey.h"
+
+class imgCacheValidator;
+class imgLoader;
+class imgRequestProxy;
+class imgCacheEntry;
+class nsIProperties;
+class nsIRequest;
+class nsITimedChannel;
+class nsIURI;
+class nsIReferrerInfo;
+
+namespace mozilla {
+enum CORSMode : uint8_t;
+namespace image {
+class Image;
+class ProgressTracker;
+}  // namespace image
+}  // namespace mozilla
+
+struct NewPartResult;
+
+class imgRequest final : public nsIStreamListener,
+                         public nsIThreadRetargetableStreamListener,
+                         public nsIChannelEventSink,
+                         public nsIInterfaceRequestor,
+                         public nsIAsyncVerifyRedirectCallback {
+  typedef mozilla::image::Image Image;
+  typedef mozilla::image::ImageCacheKey ImageCacheKey;
+  typedef mozilla::image::ProgressTracker ProgressTracker;
+  typedef mozilla::dom::ReferrerPolicy ReferrerPolicy;
+
+ public:
+  imgRequest(imgLoader* aLoader, const ImageCacheKey& aCacheKey);
+
+  NS_DECL_THREADSAFE_ISUPPORTS
+  NS_DECL_NSISTREAMLISTENER
+  NS_DECL_NSITHREADRETARGETABLESTREAMLISTENER
+  NS_DECL_NSIREQUESTOBSERVER
+  NS_DECL_NSICHANNELEVENTSINK
+  NS_DECL_NSIINTERFACEREQUESTOR
+  NS_DECL_NSIASYNCVERIFYREDIRECTCALLBACK
+
+  [[nodiscard]] nsresult Init(nsIURI* aURI, nsIURI* aFinalURI,
+                              bool aHadInsecureRedirect, nsIRequest* aRequest,
+                              nsIChannel* aChannel, imgCacheEntry* aCacheEntry,
+                              mozilla::dom::Document* aLoadingDocument,
+                              nsIPrincipal* aTriggeringPrincipal,
+                              mozilla::CORSMode aCORSMode,
+                              nsIReferrerInfo* aReferrerInfo);
+
+  void ClearLoader();
+
+  // Callers must call imgRequestProxy::Notify later.
+  void AddProxy(imgRequestProxy* proxy);
+
+  // Whether a given document is allowed to reuse this request without any
+  // revalidation.
+  bool CanReuseWithoutValidation(mozilla::dom::Document*) const;
+
+  nsresult RemoveProxy(imgRequestProxy* proxy, nsresult aStatus);
+
+  // Cancel, but also ensure that all work done in Init() is undone. Call this
+  // only when the channel has failed to open, and so calling Cancel() on it
+  // won't be sufficient.
+  void CancelAndAbort(nsresult aStatus);
+
+  // Called or dispatched by cancel for main thread only execution.
+  void ContinueCancel(nsresult aStatus);
+
+  // Called or dispatched by EvictFromCache for main thread only execution.
+  void ContinueEvict();
+
+  // Request that we start decoding the image as soon as data becomes available.
+  void StartDecoding();
+
+  uint64_t InnerWindowID() const;
+  void SetInnerWindowID(uint64_t aInnerWindowId);
+
+  // Set the cache validation information (expiry time, whether we must
+  // validate, etc) on the cache entry based on the request information.
+  // If this function is called multiple times, the information set earliest
+  // wins.
+  static void SetCacheValidation(imgCacheEntry* aEntry, nsIRequest* aRequest);
+
+  bool GetMultipart() const;
+
+  // Returns whether we went through an insecure (non-HTTPS) redirect at some
+  // point during loading. This does not consider the final URI.
+  bool HadInsecureRedirect() const;
+
+  // The CORS mode for which we loaded this image.
+  mozilla::CORSMode GetCORSMode() const { return mCORSMode; }
+
+  // The ReferrerInfo in effect when loading this image.
+  nsIReferrerInfo* GetReferrerInfo() const { return mReferrerInfo; }
+
+  // The principal for the document that loaded this image. Used when trying to
+  // validate a CORS image load.
+  already_AddRefed<nsIPrincipal> GetTriggeringPrincipal() const;
+
+  // Return the ProgressTracker associated with this imgRequest. It may live
+  // in |mProgressTracker| or in |mImage.mProgressTracker|, depending on whether
+  // mImage has been instantiated yet.
+  already_AddRefed<ProgressTracker> GetProgressTracker() const;
+
+  /// Returns the Image associated with this imgRequest, if it's ready.
+  already_AddRefed<Image> GetImage() const;
+
+  // Get the current principal of the image. No AddRefing.
+  inline nsIPrincipal* GetPrincipal() const { return mPrincipal.get(); }
+
+  /// Get the ImageCacheKey associated with this request.
+  const ImageCacheKey& CacheKey() const { return mCacheKey; }
+
+  // Resize the cache entry to 0 if it exists
+  void ResetCacheEntry();
+
+  // OK to use on any thread.
+  nsresult GetURI(nsIURI** aURI);
+  nsresult GetFinalURI(nsIURI** aURI);
+  bool IsChrome() const;
+  bool IsData() const;
+
+  nsresult GetImageErrorCode(void);
+
+  /// Returns a non-owning pointer to this imgRequest's MIME type.
+  const char* GetMimeType() const { return mContentType.get(); }
+
+  void GetFileName(nsACString& aFileName);
+
+  /// @return the priority of the underlying network request, or
+  /// PRIORITY_NORMAL if it doesn't support nsISupportsPriority.
+  int32_t Priority() const;
+
+  /// Adjust the priority of the underlying network request by @aDelta on behalf
+  /// of @aProxy.
+  void AdjustPriority(imgRequestProxy* aProxy, int32_t aDelta);
+
+  void BoostPriority(uint32_t aCategory);
+
+  /// Returns a weak pointer to the underlying request.
+  nsIRequest* GetRequest() const { return mRequest; }
+
+  nsITimedChannel* GetTimedChannel() const { return mTimedChannel; }
+
+  imgCacheValidator* GetValidator() const { return mValidator; }
+  void SetValidator(imgCacheValidator* aValidator) { mValidator = aValidator; }
+
+  void* LoadId() const { return mLoadId; }
+  void SetLoadId(void* aLoadId) { mLoadId = aLoadId; }
+
+  /// Reset the cache entry after we've dropped our reference to it. Used by
+  /// imgLoader when our cache entry is re-requested after we've dropped our
+  /// reference to it.
+  void SetCacheEntry(imgCacheEntry* aEntry);
+
+  /// Returns whether we've got a reference to the cache entry.
+  bool HasCacheEntry() const;
+
+  /// Set whether this request is stored in the cache. If it isn't, regardless
+  /// of whether this request has a non-null mCacheEntry, this imgRequest won't
+  /// try to update or modify the image cache.
+  void SetIsInCache(bool aCacheable);
+
+  void EvictFromCache();
+  void RemoveFromCache();
+
+  // Sets properties for this image; will dispatch to main thread if needed.
+  void SetProperties(const nsACString& aContentType,
+                     const nsACString& aContentDisposition);
+
+  nsIProperties* Properties() const { return mProperties; }
+
+  bool HasConsumers() const;
+
+  bool ImageAvailable() const;
+
+  bool IsDeniedCrossSiteCORSRequest() const {
+    return mIsDeniedCrossSiteCORSRequest;
+  }
+
+  bool IsCrossSiteNoCORSRequest() const { return mIsCrossSiteNoCORSRequest; }
+
+ private:
+  friend class FinishPreparingForNewPartRunnable;
+
+  virtual ~imgRequest();
+
+  void FinishPreparingForNewPart(const NewPartResult& aResult);
+
+  void Cancel(nsresult aStatus);
+
+  // Update the cache entry size based on the image container.
+  void UpdateCacheEntrySize();
+
+  /// Returns true if StartDecoding() was called.
+  bool IsDecodeRequested() const;
+
+  void AdjustPriorityInternal(int32_t aDelta);
+
+  // Weak reference to parent loader; this request cannot outlive its owner.
+  imgLoader* mLoader;
+  nsCOMPtr<nsIRequest> mRequest;
+  // The original URI we were loaded with. This is the same as the URI we are
+  // keyed on in the cache. We store a string here to avoid off main thread
+  // refcounting issues with nsStandardURL.
+  nsCOMPtr<nsIURI> mURI;
+  // The URI of the resource we ended up loading after all redirects, etc.
+  nsCOMPtr<nsIURI> mFinalURI;
+  // The principal which triggered the load of this image. Generally either
+  // the principal of the document the image is being loaded into, or of the
+  // stylesheet which specified the image to load. Used when validating for
+  // CORS.
+  nsCOMPtr<nsIPrincipal> mTriggeringPrincipal;
+  // The principal of this image.
+  nsCOMPtr<nsIPrincipal> mPrincipal;
+  nsCOMPtr<nsIProperties> mProperties;
+  nsCOMPtr<nsIChannel> mChannel;
+  nsCOMPtr<nsIInterfaceRequestor> mPrevChannelSink;
+
+  nsCOMPtr<nsITimedChannel> mTimedChannel;
+
+  nsCString mContentType;
+
+  /* we hold on to this to this so long as we have observers */
+  RefPtr<imgCacheEntry> mCacheEntry;
+
+  /// The key under which this imgRequest is stored in the image cache.
+  ImageCacheKey mCacheKey;
+
+  void* mLoadId;
+
+  /// Raw pointer to the first proxy that was added to this imgRequest. Use only
+  /// pointer comparisons; there's no guarantee this will remain valid.
+  void* mFirstProxy;
+
+  imgCacheValidator* mValidator;
+  nsCOMPtr<nsIAsyncVerifyRedirectCallback> mRedirectCallback;
+  nsCOMPtr<nsIChannel> mNewRedirectChannel;
+
+  // The CORS mode (defined in imgIRequest) this image was loaded with. By
+  // default, CORS_NONE.
+  mozilla::CORSMode mCORSMode;
+
+  // The ReferrerInfo used for this image.
+  nsCOMPtr<nsIReferrerInfo> mReferrerInfo;
+
+  nsresult mImageErrorCode;
+
+  // The categories of prioritization strategy that have been requested.
+  uint32_t mBoostCategoriesRequested = 0;
+
+  // If we've called OnImageAvailable.
+  bool mImageAvailable;
+  bool mIsDeniedCrossSiteCORSRequest;
+  bool mIsCrossSiteNoCORSRequest;
+
+  mutable mozilla::Mutex mMutex;
+
+  // Member variables protected by mMutex. Note that *all* flags in our bitfield
+  // are protected by mMutex; if you're adding a new flag that isn'protected, it
+  // must not be a part of this bitfield.
+  RefPtr<ProgressTracker> mProgressTracker MOZ_GUARDED_BY(mMutex);
+  RefPtr<Image> mImage MOZ_GUARDED_BY(mMutex);
+  bool mIsMultiPartChannel : 1 MOZ_GUARDED_BY(mMutex);
+  bool mIsInCache : 1 MOZ_GUARDED_BY(mMutex);
+  bool mDecodeRequested : 1 MOZ_GUARDED_BY(mMutex);
+  bool mNewPartPending : 1 MOZ_GUARDED_BY(mMutex);
+  bool mHadInsecureRedirect : 1 MOZ_GUARDED_BY(mMutex);
+  // The ID of the inner window origin, used for error reporting.
+  uint64_t mInnerWindowId MOZ_GUARDED_BY(mMutex);
+};
+
+#endif  // mozilla_image_imgRequest_h