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 nsIApplicationCache;
  29 class nsIProperties;
  30 class nsIRequest;
  31 class nsITimedChannel;
  32 class nsIURI;
  33 class nsIReferrerInfo;
  34
  35 namespace mozilla {
  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 nsIStreamListener,
  45                          public nsIThreadRetargetableStreamListener,
  46                          public nsIChannelEventSink,
  47                          public nsIInterfaceRequestor,
  48                          public nsIAsyncVerifyRedirectCallback {
  49   typedef mozilla::image::Image Image;
  50   typedef mozilla::image::ImageCacheKey ImageCacheKey;
  51   typedef mozilla::image::ProgressTracker ProgressTracker;
  52   typedef mozilla::dom::ReferrerPolicy ReferrerPolicy;
  53
  54  public:
  55   imgRequest(imgLoader* aLoader, const ImageCacheKey& aCacheKey);
  56
  57   NS_DECL_THREADSAFE_ISUPPORTS
  58   NS_DECL_NSISTREAMLISTENER
  59   NS_DECL_NSITHREADRETARGETABLESTREAMLISTENER
  60   NS_DECL_NSIREQUESTOBSERVER
  61   NS_DECL_NSICHANNELEVENTSINK
  62   NS_DECL_NSIINTERFACEREQUESTOR
  63   NS_DECL_NSIASYNCVERIFYREDIRECTCALLBACK
  64
  65   [[nodiscard]] nsresult Init(nsIURI* aURI, nsIURI* aFinalURI,
  66                               bool aHadInsecureRedirect, nsIRequest* aRequest,
  67                               nsIChannel* aChannel, imgCacheEntry* aCacheEntry,
  68                               mozilla::dom::Document* aLoadingDocument,
  69                               nsIPrincipal* aTriggeringPrincipal,
  70                               int32_t aCORSMode,
  71                               nsIReferrerInfo* aReferrerInfo);
  72
  73   void ClearLoader();
  74
  75   // Callers must call imgRequestProxy::Notify later.
  76   void AddProxy(imgRequestProxy* proxy);
  77
  78   // Whether a given document is allowed to reuse this request without any
  79   // revalidation.
  80   bool CanReuseWithoutValidation(mozilla::dom::Document*) const;
  81
  82   nsresult RemoveProxy(imgRequestProxy* proxy, nsresult aStatus);
  83
  84   // Cancel, but also ensure that all work done in Init() is undone. Call this
  85   // only when the channel has failed to open, and so calling Cancel() on it
  86   // won't be sufficient.
  87   void CancelAndAbort(nsresult aStatus);
  88
  89   // Called or dispatched by cancel for main thread only execution.
  90   void ContinueCancel(nsresult aStatus);
  91
  92   // Called or dispatched by EvictFromCache for main thread only execution.
  93   void ContinueEvict();
  94
  95   // Request that we start decoding the image as soon as data becomes available.
  96   void StartDecoding();
  97
  98   inline uint64_t InnerWindowID() const { return mInnerWindowId; }
  99   void SetInnerWindowID(uint64_t aInnerWindowId) {
 100     mInnerWindowId = aInnerWindowId;
 101   }
 102
 103   // Set the cache validation information (expiry time, whether we must
 104   // validate, etc) on the cache entry based on the request information.
 105   // If this function is called multiple times, the information set earliest
 106   // wins.
 107   static void SetCacheValidation(imgCacheEntry* aEntry, nsIRequest* aRequest);
 108
 109   // Check if application cache of the original load is different from
 110   // application cache of the new load.  Also lack of application cache
 111   // on one of the loads is considered a change of a loading cache since
 112   // HTTP cache may contain a different data then app cache.
 113   bool CacheChanged(nsIRequest* aNewRequest);
 114
 115   bool GetMultipart() const;
 116
 117   // Returns whether we went through an insecure (non-HTTPS) redirect at some
 118   // point during loading. This does not consider the final URI.
 119   bool HadInsecureRedirect() const;
 120
 121   // The CORS mode for which we loaded this image.
 122   int32_t GetCORSMode() const { return mCORSMode; }
 123
 124   // The ReferrerInfo in effect when loading this image.
 125   nsIReferrerInfo* GetReferrerInfo() const { return mReferrerInfo; }
 126
 127   // The principal for the document that loaded this image. Used when trying to
 128   // validate a CORS image load.
 129   already_AddRefed<nsIPrincipal> GetTriggeringPrincipal() const {
 130     nsCOMPtr<nsIPrincipal> principal = mTriggeringPrincipal;
 131     return principal.forget();
 132   }
 133
 134   // Return the ProgressTracker associated with this imgRequest. It may live
 135   // in |mProgressTracker| or in |mImage.mProgressTracker|, depending on whether
 136   // mImage has been instantiated yet.
 137   already_AddRefed<ProgressTracker> GetProgressTracker() const;
 138
 139   /// Returns the Image associated with this imgRequest, if it's ready.
 140   already_AddRefed<Image> GetImage() const;
 141
 142   // Get the current principal of the image. No AddRefing.
 143   inline nsIPrincipal* GetPrincipal() const { return mPrincipal.get(); }
 144
 145   /// Get the ImageCacheKey associated with this request.
 146   const ImageCacheKey& CacheKey() const { return mCacheKey; }
 147
 148   // Resize the cache entry to 0 if it exists
 149   void ResetCacheEntry();
 150
 151   // OK to use on any thread.
 152   nsresult GetURI(nsIURI** aURI);
 153   nsresult GetFinalURI(nsIURI** aURI);
 154   bool IsChrome() const;
 155   bool IsData() const;
 156
 157   nsresult GetImageErrorCode(void);
 158
 159   /// Returns a non-owning pointer to this imgRequest's MIME type.
 160   const char* GetMimeType() const { return mContentType.get(); }
 161
 162   /// @return the priority of the underlying network request, or
 163   /// PRIORITY_NORMAL if it doesn't support nsISupportsPriority.
 164   int32_t Priority() const;
 165
 166   /// Adjust the priority of the underlying network request by @aDelta on behalf
 167   /// of @aProxy.
 168   void AdjustPriority(imgRequestProxy* aProxy, int32_t aDelta);
 169
 170   void BoostPriority(uint32_t aCategory);
 171
 172   /// Returns a weak pointer to the underlying request.
 173   nsIRequest* GetRequest() const { return mRequest; }
 174
 175   nsITimedChannel* GetTimedChannel() const { return mTimedChannel; }
 176
 177   imgCacheValidator* GetValidator() const { return mValidator; }
 178   void SetValidator(imgCacheValidator* aValidator) { mValidator = aValidator; }
 179
 180   void* LoadId() const { return mLoadId; }
 181   void SetLoadId(void* aLoadId) { mLoadId = aLoadId; }
 182
 183   /// Reset the cache entry after we've dropped our reference to it. Used by
 184   /// imgLoader when our cache entry is re-requested after we've dropped our
 185   /// reference to it.
 186   void SetCacheEntry(imgCacheEntry* aEntry);
 187
 188   /// Returns whether we've got a reference to the cache entry.
 189   bool HasCacheEntry() const;
 190
 191   /// Set whether this request is stored in the cache. If it isn't, regardless
 192   /// of whether this request has a non-null mCacheEntry, this imgRequest won't
 193   /// try to update or modify the image cache.
 194   void SetIsInCache(bool aCacheable);
 195
 196   void EvictFromCache();
 197   void RemoveFromCache();
 198
 199   // Sets properties for this image; will dispatch to main thread if needed.
 200   void SetProperties(const nsACString& aContentType,
 201                      const nsACString& aContentDisposition);
 202
 203   nsIProperties* Properties() const { return mProperties; }
 204
 205   bool HasConsumers() const;
 206
 207   bool ImageAvailable() const;
 208
 209   bool IsDeniedCrossSiteCORSRequest() const {
 210     return mIsDeniedCrossSiteCORSRequest;
 211   }
 212
 213   bool IsCrossSiteNoCORSRequest() const { return mIsCrossSiteNoCORSRequest; }
 214
 215  private:
 216   friend class FinishPreparingForNewPartRunnable;
 217
 218   virtual ~imgRequest();
 219
 220   void FinishPreparingForNewPart(const NewPartResult& aResult);
 221
 222   void Cancel(nsresult aStatus);
 223
 224   // Update the cache entry size based on the image container.
 225   void UpdateCacheEntrySize();
 226
 227   /// Returns true if StartDecoding() was called.
 228   bool IsDecodeRequested() const;
 229
 230   void AdjustPriorityInternal(int32_t aDelta);
 231
 232   // Weak reference to parent loader; this request cannot outlive its owner.
 233   imgLoader* mLoader;
 234   nsCOMPtr<nsIRequest> mRequest;
 235   // The original URI we were loaded with. This is the same as the URI we are
 236   // keyed on in the cache. We store a string here to avoid off main thread
 237   // refcounting issues with nsStandardURL.
 238   nsCOMPtr<nsIURI> mURI;
 239   // The URI of the resource we ended up loading after all redirects, etc.
 240   nsCOMPtr<nsIURI> mFinalURI;
 241   // The principal which triggered the load of this image. Generally either
 242   // the principal of the document the image is being loaded into, or of the
 243   // stylesheet which specified the image to load. Used when validating for
 244   // CORS.
 245   nsCOMPtr<nsIPrincipal> mTriggeringPrincipal;
 246   // The principal of this image.
 247   nsCOMPtr<nsIPrincipal> mPrincipal;
 248   nsCOMPtr<nsIProperties> mProperties;
 249   nsCOMPtr<nsIChannel> mChannel;
 250   nsCOMPtr<nsIInterfaceRequestor> mPrevChannelSink;
 251   nsCOMPtr<nsIApplicationCache> mApplicationCache;
 252
 253   nsCOMPtr<nsITimedChannel> mTimedChannel;
 254
 255   nsCString mContentType;
 256
 257   /* we hold on to this to this so long as we have observers */
 258   RefPtr<imgCacheEntry> mCacheEntry;
 259
 260   /// The key under which this imgRequest is stored in the image cache.
 261   ImageCacheKey mCacheKey;
 262
 263   void* mLoadId;
 264
 265   /// Raw pointer to the first proxy that was added to this imgRequest. Use only
 266   /// pointer comparisons; there's no guarantee this will remain valid.
 267   void* mFirstProxy;
 268
 269   imgCacheValidator* mValidator;
 270   nsCOMPtr<nsIAsyncVerifyRedirectCallback> mRedirectCallback;
 271   nsCOMPtr<nsIChannel> mNewRedirectChannel;
 272
 273   // The ID of the inner window origin, used for error reporting.
 274   uint64_t mInnerWindowId;
 275
 276   // The CORS mode (defined in imgIRequest) this image was loaded with. By
 277   // default, imgIRequest::CORS_NONE.
 278   int32_t mCORSMode;
 279
 280   // The ReferrerInfo used for this image.
 281   nsCOMPtr<nsIReferrerInfo> mReferrerInfo;
 282
 283   nsresult mImageErrorCode;
 284
 285   // The categories of prioritization strategy that have been requested.
 286   uint32_t mBoostCategoriesRequested = 0;
 287
 288   // If we've called OnImageAvailable.
 289   bool mImageAvailable;
 290   bool mIsDeniedCrossSiteCORSRequest;
 291   bool mIsCrossSiteNoCORSRequest;
 292
 293   mutable mozilla::Mutex mMutex;
 294
 295   // Member variables protected by mMutex. Note that *all* flags in our bitfield
 296   // are protected by mMutex; if you're adding a new flag that isn'protected, it
 297   // must not be a part of this bitfield.
 298   RefPtr<ProgressTracker> mProgressTracker;
 299   RefPtr<Image> mImage;
 300   bool mIsMultiPartChannel : 1;
 301   bool mIsInCache : 1;
 302   bool mDecodeRequested : 1;
 303   bool mNewPartPending : 1;
 304   bool mHadInsecureRedirect : 1;
 305 };
 306
 307 #endif  // mozilla_image_imgRequest_h