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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