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 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                               mozilla::CORSMode 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   bool GetMultipart() const;
 110
 111   // Returns whether we went through an insecure (non-HTTPS) redirect at some
 112   // point during loading. This does not consider the final URI.
 113   bool HadInsecureRedirect() const;
 114
 115   // The CORS mode for which we loaded this image.
 116   mozilla::CORSMode GetCORSMode() const { return mCORSMode; }
 117
 118   // The ReferrerInfo in effect when loading this image.
 119   nsIReferrerInfo* GetReferrerInfo() const { return mReferrerInfo; }
 120
 121   // The principal for the document that loaded this image. Used when trying to
 122   // validate a CORS image load.
 123   already_AddRefed<nsIPrincipal> GetTriggeringPrincipal() const {
 124     nsCOMPtr<nsIPrincipal> principal = mTriggeringPrincipal;
 125     return principal.forget();
 126   }
 127
 128   // Return the ProgressTracker associated with this imgRequest. It may live
 129   // in |mProgressTracker| or in |mImage.mProgressTracker|, depending on whether
 130   // mImage has been instantiated yet.
 131   already_AddRefed<ProgressTracker> GetProgressTracker() const;
 132
 133   /// Returns the Image associated with this imgRequest, if it's ready.
 134   already_AddRefed<Image> GetImage() const;
 135
 136   // Get the current principal of the image. No AddRefing.
 137   inline nsIPrincipal* GetPrincipal() const { return mPrincipal.get(); }
 138
 139   /// Get the ImageCacheKey associated with this request.
 140   const ImageCacheKey& CacheKey() const { return mCacheKey; }
 141
 142   // Resize the cache entry to 0 if it exists
 143   void ResetCacheEntry();
 144
 145   // OK to use on any thread.
 146   nsresult GetURI(nsIURI** aURI);
 147   nsresult GetFinalURI(nsIURI** aURI);
 148   bool IsChrome() const;
 149   bool IsData() const;
 150
 151   nsresult GetImageErrorCode(void);
 152
 153   /// Returns a non-owning pointer to this imgRequest's MIME type.
 154   const char* GetMimeType() const { return mContentType.get(); }
 155
 156   /// @return the priority of the underlying network request, or
 157   /// PRIORITY_NORMAL if it doesn't support nsISupportsPriority.
 158   int32_t Priority() const;
 159
 160   /// Adjust the priority of the underlying network request by @aDelta on behalf
 161   /// of @aProxy.
 162   void AdjustPriority(imgRequestProxy* aProxy, int32_t aDelta);
 163
 164   void BoostPriority(uint32_t aCategory);
 165
 166   /// Returns a weak pointer to the underlying request.
 167   nsIRequest* GetRequest() const { return mRequest; }
 168
 169   nsITimedChannel* GetTimedChannel() const { return mTimedChannel; }
 170
 171   imgCacheValidator* GetValidator() const { return mValidator; }
 172   void SetValidator(imgCacheValidator* aValidator) { mValidator = aValidator; }
 173
 174   void* LoadId() const { return mLoadId; }
 175   void SetLoadId(void* aLoadId) { mLoadId = aLoadId; }
 176
 177   /// Reset the cache entry after we've dropped our reference to it. Used by
 178   /// imgLoader when our cache entry is re-requested after we've dropped our
 179   /// reference to it.
 180   void SetCacheEntry(imgCacheEntry* aEntry);
 181
 182   /// Returns whether we've got a reference to the cache entry.
 183   bool HasCacheEntry() const;
 184
 185   /// Set whether this request is stored in the cache. If it isn't, regardless
 186   /// of whether this request has a non-null mCacheEntry, this imgRequest won't
 187   /// try to update or modify the image cache.
 188   void SetIsInCache(bool aCacheable);
 189
 190   void EvictFromCache();
 191   void RemoveFromCache();
 192
 193   // Sets properties for this image; will dispatch to main thread if needed.
 194   void SetProperties(const nsACString& aContentType,
 195                      const nsACString& aContentDisposition);
 196
 197   nsIProperties* Properties() const { return mProperties; }
 198
 199   bool HasConsumers() const;
 200
 201   bool ImageAvailable() const;
 202
 203   bool IsDeniedCrossSiteCORSRequest() const {
 204     return mIsDeniedCrossSiteCORSRequest;
 205   }
 206
 207   bool IsCrossSiteNoCORSRequest() const { return mIsCrossSiteNoCORSRequest; }
 208
 209  private:
 210   friend class FinishPreparingForNewPartRunnable;
 211
 212   virtual ~imgRequest();
 213
 214   void FinishPreparingForNewPart(const NewPartResult& aResult);
 215
 216   void Cancel(nsresult aStatus);
 217
 218   // Update the cache entry size based on the image container.
 219   void UpdateCacheEntrySize();
 220
 221   /// Returns true if StartDecoding() was called.
 222   bool IsDecodeRequested() const;
 223
 224   void AdjustPriorityInternal(int32_t aDelta);
 225
 226   // Weak reference to parent loader; this request cannot outlive its owner.
 227   imgLoader* mLoader;
 228   nsCOMPtr<nsIRequest> mRequest;
 229   // The original URI we were loaded with. This is the same as the URI we are
 230   // keyed on in the cache. We store a string here to avoid off main thread
 231   // refcounting issues with nsStandardURL.
 232   nsCOMPtr<nsIURI> mURI;
 233   // The URI of the resource we ended up loading after all redirects, etc.
 234   nsCOMPtr<nsIURI> mFinalURI;
 235   // The principal which triggered the load of this image. Generally either
 236   // the principal of the document the image is being loaded into, or of the
 237   // stylesheet which specified the image to load. Used when validating for
 238   // CORS.
 239   nsCOMPtr<nsIPrincipal> mTriggeringPrincipal;
 240   // The principal of this image.
 241   nsCOMPtr<nsIPrincipal> mPrincipal;
 242   nsCOMPtr<nsIProperties> mProperties;
 243   nsCOMPtr<nsIChannel> mChannel;
 244   nsCOMPtr<nsIInterfaceRequestor> mPrevChannelSink;
 245
 246   nsCOMPtr<nsITimedChannel> mTimedChannel;
 247
 248   nsCString mContentType;
 249
 250   /* we hold on to this to this so long as we have observers */
 251   RefPtr<imgCacheEntry> mCacheEntry;
 252
 253   /// The key under which this imgRequest is stored in the image cache.
 254   ImageCacheKey mCacheKey;
 255
 256   void* mLoadId;
 257
 258   /// Raw pointer to the first proxy that was added to this imgRequest. Use only
 259   /// pointer comparisons; there's no guarantee this will remain valid.
 260   void* mFirstProxy;
 261
 262   imgCacheValidator* mValidator;
 263   nsCOMPtr<nsIAsyncVerifyRedirectCallback> mRedirectCallback;
 264   nsCOMPtr<nsIChannel> mNewRedirectChannel;
 265
 266   // The ID of the inner window origin, used for error reporting.
 267   uint64_t mInnerWindowId;
 268
 269   // The CORS mode (defined in imgIRequest) this image was loaded with. By
 270   // default, CORS_NONE.
 271   mozilla::CORSMode mCORSMode;
 272
 273   // The ReferrerInfo used for this image.
 274   nsCOMPtr<nsIReferrerInfo> mReferrerInfo;
 275
 276   nsresult mImageErrorCode;
 277
 278   // The categories of prioritization strategy that have been requested.
 279   uint32_t mBoostCategoriesRequested = 0;
 280
 281   // If we've called OnImageAvailable.
 282   bool mImageAvailable;
 283   bool mIsDeniedCrossSiteCORSRequest;
 284   bool mIsCrossSiteNoCORSRequest;
 285
 286   mutable mozilla::Mutex mMutex;
 287
 288   // Member variables protected by mMutex. Note that *all* flags in our bitfield
 289   // are protected by mMutex; if you're adding a new flag that isn'protected, it
 290   // must not be a part of this bitfield.
 291   RefPtr<ProgressTracker> mProgressTracker;
 292   RefPtr<Image> mImage;
 293   bool mIsMultiPartChannel : 1;
 294   bool mIsInCache : 1;
 295   bool mDecodeRequested : 1;
 296   bool mNewPartPending : 1;
 297   bool mHadInsecureRedirect : 1;
 298 };
 299
 300 #endif  // mozilla_image_imgRequest_h