image/imgRequest.h

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
   2  *
   3  * This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef mozilla_image_imgRequest_h
   8 #define mozilla_image_imgRequest_h
   9
  10 #include "nsIChannelEventSink.h"
  11 #include "nsIInterfaceRequestor.h"
  12 #include "nsIStreamListener.h"
  13 #include "nsIThreadRetargetableStreamListener.h"
  14 #include "nsIPrincipal.h"
  15
  16 #include "nsCOMPtr.h"
  17 #include "nsProxyRelease.h"
  18 #include "nsString.h"
  19 #include "nsError.h"
  20 #include "nsIAsyncVerifyRedirectCallback.h"
  21 #include "mozilla/Mutex.h"
  22 #include "ImageCacheKey.h"
  23
  24 class imgCacheValidator;
  25 class imgLoader;
  26 class imgRequestProxy;
  27 class imgCacheEntry;
  28 class nsIProperties;
  29 class nsIRequest;
  30 class nsITimedChannel;
  31 class nsIURI;
  32 class nsIReferrerInfo;
  33
  34 namespace mozilla {
  35 enum CORSMode : uint8_t;
  36 namespace image {
  37 class Image;
  38 class ProgressTracker;
  39 }  // namespace image
  40 }  // namespace mozilla
  41
  42 struct NewPartResult;
  43
  44 class imgRequest final : public nsIThreadRetargetableStreamListener,
  45                          public nsIChannelEventSink,
  46                          public nsIInterfaceRequestor,
  47                          public nsIAsyncVerifyRedirectCallback {
  48   typedef mozilla::image::Image Image;
  49   typedef mozilla::image::ImageCacheKey ImageCacheKey;
  50   typedef mozilla::image::ProgressTracker ProgressTracker;
  51   typedef mozilla::dom::ReferrerPolicy ReferrerPolicy;
  52
  53  public:
  54   imgRequest(imgLoader* aLoader, const ImageCacheKey& aCacheKey);
  55
  56   NS_DECL_THREADSAFE_ISUPPORTS
  57   NS_DECL_NSISTREAMLISTENER
  58   NS_DECL_NSITHREADRETARGETABLESTREAMLISTENER
  59   NS_DECL_NSIREQUESTOBSERVER
  60   NS_DECL_NSICHANNELEVENTSINK
  61   NS_DECL_NSIINTERFACEREQUESTOR
  62   NS_DECL_NSIASYNCVERIFYREDIRECTCALLBACK
  63
  64   [[nodiscard]] nsresult Init(nsIURI* aURI, nsIURI* aFinalURI,
  65                               bool aHadInsecureRedirect, nsIRequest* aRequest,
  66                               nsIChannel* aChannel, imgCacheEntry* aCacheEntry,
  67                               mozilla::dom::Document* aLoadingDocument,
  68                               nsIPrincipal* aTriggeringPrincipal,
  69                               mozilla::CORSMode aCORSMode,
  70                               nsIReferrerInfo* aReferrerInfo);
  71
  72   void ClearLoader();
  73
  74   // Callers must call imgRequestProxy::Notify later.
  75   void AddProxy(imgRequestProxy* proxy);
  76
  77   // Whether a given document is allowed to reuse this request without any
  78   // revalidation.
  79   bool CanReuseWithoutValidation(mozilla::dom::Document*) const;
  80
  81   nsresult RemoveProxy(imgRequestProxy* proxy, nsresult aStatus);
  82
  83   // Cancel, but also ensure that all work done in Init() is undone. Call this
  84   // only when the channel has failed to open, and so calling Cancel() on it
  85   // won't be sufficient.
  86   void CancelAndAbort(nsresult aStatus);
  87
  88   // Called or dispatched by cancel for main thread only execution.
  89   void ContinueCancel(nsresult aStatus);
  90
  91   // Called or dispatched by EvictFromCache for main thread only execution.
  92   void ContinueEvict();
  93
  94   // Request that we start decoding the image as soon as data becomes available.
  95   void StartDecoding();
  96
  97   uint64_t InnerWindowID() const;
  98   void SetInnerWindowID(uint64_t aInnerWindowId);
  99
 100   // Set the cache validation information (expiry time, whether we must
 101   // validate, etc) on the cache entry based on the request information.
 102   // If this function is called multiple times, the information set earliest
 103   // wins.
 104   static void SetCacheValidation(imgCacheEntry* aEntry, nsIRequest* aRequest);
 105
 106   bool GetMultipart() const;
 107
 108   // Returns whether we went through an insecure (non-HTTPS) redirect at some
 109   // point during loading. This does not consider the final URI.
 110   bool HadInsecureRedirect() const;
 111
 112   // The CORS mode for which we loaded this image.
 113   mozilla::CORSMode GetCORSMode() const { return mCORSMode; }
 114
 115   // The ReferrerInfo in effect when loading this image.
 116   nsIReferrerInfo* GetReferrerInfo() const { return mReferrerInfo; }
 117
 118   // The principal for the document that loaded this image. Used when trying to
 119   // validate a CORS image load.
 120   already_AddRefed<nsIPrincipal> GetTriggeringPrincipal() const;
 121
 122   // Return the ProgressTracker associated with this imgRequest. It may live
 123   // in |mProgressTracker| or in |mImage.mProgressTracker|, depending on whether
 124   // mImage has been instantiated yet.
 125   already_AddRefed<ProgressTracker> GetProgressTracker() const;
 126
 127   /// Returns the Image associated with this imgRequest, if it's ready.
 128   already_AddRefed<Image> GetImage() const;
 129
 130   // Get the current principal of the image. No AddRefing.
 131   inline nsIPrincipal* GetPrincipal() const { return mPrincipal.get(); }
 132
 133   /// Get the ImageCacheKey associated with this request.
 134   const ImageCacheKey& CacheKey() const { return mCacheKey; }
 135
 136   // Resize the cache entry to 0 if it exists
 137   void ResetCacheEntry();
 138
 139   // OK to use on any thread.
 140   nsresult GetURI(nsIURI** aURI);
 141   nsresult GetFinalURI(nsIURI** aURI);
 142   bool IsChrome() const;
 143   bool IsData() const;
 144
 145   nsresult GetImageErrorCode(void);
 146
 147   /// Returns a non-owning pointer to this imgRequest's MIME type.
 148   const char* GetMimeType() const { return mContentType.get(); }
 149
 150   void GetFileName(nsACString& aFileName);
 151
 152   /// @return the priority of the underlying network request, or
 153   /// PRIORITY_NORMAL if it doesn't support nsISupportsPriority.
 154   int32_t Priority() const;
 155
 156   /// Adjust the priority of the underlying network request by @aDelta on behalf
 157   /// of @aProxy.
 158   void AdjustPriority(imgRequestProxy* aProxy, int32_t aDelta);
 159
 160   void BoostPriority(uint32_t aCategory);
 161
 162   /// Returns a weak pointer to the underlying request.
 163   nsIRequest* GetRequest() const { return mRequest; }
 164
 165   nsITimedChannel* GetTimedChannel() const { return mTimedChannel; }
 166
 167   imgCacheValidator* GetValidator() const { return mValidator; }
 168   void SetValidator(imgCacheValidator* aValidator) { mValidator = aValidator; }
 169
 170   void* LoadId() const { return mLoadId; }
 171   void SetLoadId(void* aLoadId) { mLoadId = aLoadId; }
 172
 173   /// Reset the cache entry after we've dropped our reference to it. Used by
 174   /// imgLoader when our cache entry is re-requested after we've dropped our
 175   /// reference to it.
 176   void SetCacheEntry(imgCacheEntry* aEntry);
 177
 178   /// Returns whether we've got a reference to the cache entry.
 179   bool HasCacheEntry() const;
 180
 181   /// Set whether this request is stored in the cache. If it isn't, regardless
 182   /// of whether this request has a non-null mCacheEntry, this imgRequest won't
 183   /// try to update or modify the image cache.
 184   void SetIsInCache(bool aCacheable);
 185
 186   void EvictFromCache();
 187   void RemoveFromCache();
 188
 189   // Sets properties for this image; will dispatch to main thread if needed.
 190   void SetProperties(const nsACString& aContentType,
 191                      const nsACString& aContentDisposition);
 192
 193   nsIProperties* Properties() const { return mProperties; }
 194
 195   bool HasConsumers() const;
 196
 197   bool ImageAvailable() const;
 198
 199   bool IsDeniedCrossSiteCORSRequest() const {
 200     return mIsDeniedCrossSiteCORSRequest;
 201   }
 202
 203   bool IsCrossSiteNoCORSRequest() const { return mIsCrossSiteNoCORSRequest; }
 204
 205  private:
 206   friend class FinishPreparingForNewPartRunnable;
 207
 208   virtual ~imgRequest();
 209
 210   void FinishPreparingForNewPart(const NewPartResult& aResult);
 211
 212   void Cancel(nsresult aStatus);
 213
 214   // Update the cache entry size based on the image container.
 215   void UpdateCacheEntrySize();
 216
 217   /// Returns true if StartDecoding() was called.
 218   bool IsDecodeRequested() const;
 219
 220   void AdjustPriorityInternal(int32_t aDelta);
 221
 222   // Weak reference to parent loader; this request cannot outlive its owner.
 223   imgLoader* mLoader;
 224   nsCOMPtr<nsIRequest> mRequest;
 225   // The original URI we were loaded with. This is the same as the URI we are
 226   // keyed on in the cache. We store a string here to avoid off main thread
 227   // refcounting issues with nsStandardURL.
 228   nsCOMPtr<nsIURI> mURI;
 229   // The URI of the resource we ended up loading after all redirects, etc.
 230   nsCOMPtr<nsIURI> mFinalURI;
 231   // The principal which triggered the load of this image. Generally either
 232   // the principal of the document the image is being loaded into, or of the
 233   // stylesheet which specified the image to load. Used when validating for
 234   // CORS.
 235   nsCOMPtr<nsIPrincipal> mTriggeringPrincipal;
 236   // The principal of this image.
 237   nsCOMPtr<nsIPrincipal> mPrincipal;
 238   nsCOMPtr<nsIProperties> mProperties;
 239   nsCOMPtr<nsIChannel> mChannel;
 240   nsCOMPtr<nsIInterfaceRequestor> mPrevChannelSink;
 241
 242   nsCOMPtr<nsITimedChannel> mTimedChannel;
 243
 244   nsCString mContentType;
 245
 246   /* we hold on to this to this so long as we have observers */
 247   RefPtr<imgCacheEntry> mCacheEntry;
 248
 249   /// The key under which this imgRequest is stored in the image cache.
 250   ImageCacheKey mCacheKey;
 251
 252   void* mLoadId;
 253
 254   /// Raw pointer to the first proxy that was added to this imgRequest. Use only
 255   /// pointer comparisons; there's no guarantee this will remain valid.
 256   void* mFirstProxy;
 257
 258   imgCacheValidator* mValidator;
 259   nsCOMPtr<nsIAsyncVerifyRedirectCallback> mRedirectCallback;
 260   nsCOMPtr<nsIChannel> mNewRedirectChannel;
 261
 262   // The CORS mode (defined in imgIRequest) this image was loaded with. By
 263   // default, CORS_NONE.
 264   mozilla::CORSMode mCORSMode;
 265
 266   // The ReferrerInfo used for this image.
 267   nsCOMPtr<nsIReferrerInfo> mReferrerInfo;
 268
 269   nsresult mImageErrorCode;
 270
 271   // The categories of prioritization strategy that have been requested.
 272   uint32_t mBoostCategoriesRequested = 0;
 273
 274   // If we've called OnImageAvailable.
 275   bool mImageAvailable;
 276   bool mIsDeniedCrossSiteCORSRequest;
 277   bool mIsCrossSiteNoCORSRequest;
 278
 279   mutable mozilla::Mutex mMutex;
 280
 281   // Member variables protected by mMutex. Note that *all* flags in our bitfield
 282   // are protected by mMutex; if you're adding a new flag that isn'protected, it
 283   // must not be a part of this bitfield.
 284   RefPtr<ProgressTracker> mProgressTracker MOZ_GUARDED_BY(mMutex);
 285   RefPtr<Image> mImage MOZ_GUARDED_BY(mMutex);
 286   bool mIsMultiPartChannel : 1 MOZ_GUARDED_BY(mMutex);
 287   bool mIsInCache : 1 MOZ_GUARDED_BY(mMutex);
 288   bool mDecodeRequested : 1 MOZ_GUARDED_BY(mMutex);
 289   bool mNewPartPending : 1 MOZ_GUARDED_BY(mMutex);
 290   bool mHadInsecureRedirect : 1 MOZ_GUARDED_BY(mMutex);
 291   // The ID of the inner window origin, used for error reporting.
 292   uint64_t mInnerWindowId MOZ_GUARDED_BY(mMutex);
 293 };
 294
 295 #endif  // mozilla_image_imgRequest_h