diff options
Diffstat (limited to 'image/imgLoader.cpp')
| -rw-r--r-- | image/imgLoader.cpp | 3334 |
1 files changed, 3334 insertions, 0 deletions
diff --git a/image/imgLoader.cpp b/image/imgLoader.cpp new file mode 100644 index 0000000000..dcfb031789 --- /dev/null +++ b/image/imgLoader.cpp @@ -0,0 +1,3334 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* 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/. */ + +// Undefine windows version of LoadImage because our code uses that name. +#include "mozilla/ScopeExit.h" +#include "nsIChildChannel.h" +#undef LoadImage + +#include "imgLoader.h" + +#include <algorithm> +#include <utility> + +#include "DecoderFactory.h" +#include "Image.h" +#include "ImageLogging.h" +#include "ReferrerInfo.h" +#include "imgRequestProxy.h" +#include "mozilla/Attributes.h" +#include "mozilla/BasePrincipal.h" +#include "mozilla/ChaosMode.h" +#include "mozilla/ClearOnShutdown.h" +#include "mozilla/LoadInfo.h" +#include "mozilla/NullPrincipal.h" +#include "mozilla/Preferences.h" +#include "mozilla/ProfilerLabels.h" +#include "mozilla/StaticPrefs_image.h" +#include "mozilla/StaticPrefs_network.h" +#include "mozilla/StoragePrincipalHelper.h" +#include "mozilla/dom/ContentParent.h" +#include "mozilla/dom/nsMixedContentBlocker.h" +#include "mozilla/image/ImageMemoryReporter.h" +#include "mozilla/layers/CompositorManagerChild.h" +#include "nsCOMPtr.h" +#include "nsCRT.h" +#include "nsComponentManagerUtils.h" +#include "nsContentPolicyUtils.h" +#include "nsContentSecurityManager.h" +#include "nsContentUtils.h" +#include "nsHttpChannel.h" +#include "nsIAsyncVerifyRedirectCallback.h" +#include "nsICacheInfoChannel.h" +#include "nsIChannelEventSink.h" +#include "nsIClassOfService.h" +#include "nsIEffectiveTLDService.h" +#include "nsIFile.h" +#include "nsIFileURL.h" +#include "nsIHttpChannel.h" +#include "nsIInterfaceRequestor.h" +#include "nsIInterfaceRequestorUtils.h" +#include "nsIMemoryReporter.h" +#include "nsINetworkPredictor.h" +#include "nsIProgressEventSink.h" +#include "nsIProtocolHandler.h" +#include "nsImageModule.h" +#include "nsMediaSniffer.h" +#include "nsMimeTypes.h" +#include "nsNetCID.h" +#include "nsNetUtil.h" +#include "nsProxyRelease.h" +#include "nsQueryObject.h" +#include "nsReadableUtils.h" +#include "nsStreamUtils.h" +#include "prtime.h" + +// we want to explore making the document own the load group +// so we can associate the document URI with the load group. +// until this point, we have an evil hack: +#include "nsIHttpChannelInternal.h" +#include "nsILoadGroupChild.h" +#include "nsIDocShell.h" + +using namespace mozilla; +using namespace mozilla::dom; +using namespace mozilla::image; +using namespace mozilla::net; + +MOZ_DEFINE_MALLOC_SIZE_OF(ImagesMallocSizeOf) + +class imgMemoryReporter final : public nsIMemoryReporter { + ~imgMemoryReporter() = default; + + public: + NS_DECL_ISUPPORTS + + NS_IMETHOD CollectReports(nsIHandleReportCallback* aHandleReport, + nsISupports* aData, bool aAnonymize) override { + MOZ_ASSERT(NS_IsMainThread()); + + layers::CompositorManagerChild* manager = + mozilla::layers::CompositorManagerChild::GetInstance(); + if (!manager || !StaticPrefs::image_mem_debug_reporting()) { + layers::SharedSurfacesMemoryReport sharedSurfaces; + FinishCollectReports(aHandleReport, aData, aAnonymize, sharedSurfaces); + return NS_OK; + } + + RefPtr<imgMemoryReporter> self(this); + nsCOMPtr<nsIHandleReportCallback> handleReport(aHandleReport); + nsCOMPtr<nsISupports> data(aData); + manager->SendReportSharedSurfacesMemory( + [=](layers::SharedSurfacesMemoryReport aReport) { + self->FinishCollectReports(handleReport, data, aAnonymize, aReport); + }, + [=](mozilla::ipc::ResponseRejectReason&& aReason) { + layers::SharedSurfacesMemoryReport sharedSurfaces; + self->FinishCollectReports(handleReport, data, aAnonymize, + sharedSurfaces); + }); + return NS_OK; + } + + void FinishCollectReports( + nsIHandleReportCallback* aHandleReport, nsISupports* aData, + bool aAnonymize, layers::SharedSurfacesMemoryReport& aSharedSurfaces) { + nsTArray<ImageMemoryCounter> chrome; + nsTArray<ImageMemoryCounter> content; + nsTArray<ImageMemoryCounter> uncached; + + for (uint32_t i = 0; i < mKnownLoaders.Length(); i++) { + for (imgCacheEntry* entry : mKnownLoaders[i]->mCache.Values()) { + RefPtr<imgRequest> req = entry->GetRequest(); + RecordCounterForRequest(req, &content, !entry->HasNoProxies()); + } + MutexAutoLock lock(mKnownLoaders[i]->mUncachedImagesMutex); + for (RefPtr<imgRequest> req : mKnownLoaders[i]->mUncachedImages) { + RecordCounterForRequest(req, &uncached, req->HasConsumers()); + } + } + + // Note that we only need to anonymize content image URIs. + + ReportCounterArray(aHandleReport, aData, chrome, "images/chrome", + /* aAnonymize */ false, aSharedSurfaces); + + ReportCounterArray(aHandleReport, aData, content, "images/content", + aAnonymize, aSharedSurfaces); + + // Uncached images may be content or chrome, so anonymize them. + ReportCounterArray(aHandleReport, aData, uncached, "images/uncached", + aAnonymize, aSharedSurfaces); + + // Report any shared surfaces that were not merged with the surface cache. + ImageMemoryReporter::ReportSharedSurfaces(aHandleReport, aData, + aSharedSurfaces); + + nsCOMPtr<nsIMemoryReporterManager> imgr = + do_GetService("@mozilla.org/memory-reporter-manager;1"); + if (imgr) { + imgr->EndReport(); + } + } + + static int64_t ImagesContentUsedUncompressedDistinguishedAmount() { + size_t n = 0; + for (uint32_t i = 0; i < imgLoader::sMemReporter->mKnownLoaders.Length(); + i++) { + for (imgCacheEntry* entry : + imgLoader::sMemReporter->mKnownLoaders[i]->mCache.Values()) { + if (entry->HasNoProxies()) { + continue; + } + + RefPtr<imgRequest> req = entry->GetRequest(); + RefPtr<image::Image> image = req->GetImage(); + if (!image) { + continue; + } + + // Both this and EntryImageSizes measure + // images/content/raster/used/decoded memory. This function's + // measurement is secondary -- the result doesn't go in the "explicit" + // tree -- so we use moz_malloc_size_of instead of ImagesMallocSizeOf to + // prevent DMD from seeing it reported twice. + SizeOfState state(moz_malloc_size_of); + ImageMemoryCounter counter(req, image, state, /* aIsUsed = */ true); + + n += counter.Values().DecodedHeap(); + n += counter.Values().DecodedNonHeap(); + n += counter.Values().DecodedUnknown(); + } + } + return n; + } + + void RegisterLoader(imgLoader* aLoader) { + mKnownLoaders.AppendElement(aLoader); + } + + void UnregisterLoader(imgLoader* aLoader) { + mKnownLoaders.RemoveElement(aLoader); + } + + private: + nsTArray<imgLoader*> mKnownLoaders; + + struct MemoryTotal { + MemoryTotal& operator+=(const ImageMemoryCounter& aImageCounter) { + if (aImageCounter.Type() == imgIContainer::TYPE_RASTER) { + if (aImageCounter.IsUsed()) { + mUsedRasterCounter += aImageCounter.Values(); + } else { + mUnusedRasterCounter += aImageCounter.Values(); + } + } else if (aImageCounter.Type() == imgIContainer::TYPE_VECTOR) { + if (aImageCounter.IsUsed()) { + mUsedVectorCounter += aImageCounter.Values(); + } else { + mUnusedVectorCounter += aImageCounter.Values(); + } + } else if (aImageCounter.Type() == imgIContainer::TYPE_REQUEST) { + // Nothing to do, we did not get to the point of having an image. + } else { + MOZ_CRASH("Unexpected image type"); + } + + return *this; + } + + const MemoryCounter& UsedRaster() const { return mUsedRasterCounter; } + const MemoryCounter& UnusedRaster() const { return mUnusedRasterCounter; } + const MemoryCounter& UsedVector() const { return mUsedVectorCounter; } + const MemoryCounter& UnusedVector() const { return mUnusedVectorCounter; } + + private: + MemoryCounter mUsedRasterCounter; + MemoryCounter mUnusedRasterCounter; + MemoryCounter mUsedVectorCounter; + MemoryCounter mUnusedVectorCounter; + }; + + // Reports all images of a single kind, e.g. all used chrome images. + void ReportCounterArray(nsIHandleReportCallback* aHandleReport, + nsISupports* aData, + nsTArray<ImageMemoryCounter>& aCounterArray, + const char* aPathPrefix, bool aAnonymize, + layers::SharedSurfacesMemoryReport& aSharedSurfaces) { + MemoryTotal summaryTotal; + MemoryTotal nonNotableTotal; + + // Report notable images, and compute total and non-notable aggregate sizes. + for (uint32_t i = 0; i < aCounterArray.Length(); i++) { + ImageMemoryCounter& counter = aCounterArray[i]; + + if (aAnonymize) { + counter.URI().Truncate(); + counter.URI().AppendPrintf("<anonymized-%u>", i); + } else { + // The URI could be an extremely long data: URI. Truncate if needed. + static const size_t max = 256; + if (counter.URI().Length() > max) { + counter.URI().Truncate(max); + counter.URI().AppendLiteral(" (truncated)"); + } + counter.URI().ReplaceChar('/', '\\'); + } + + summaryTotal += counter; + + if (counter.IsNotable() || StaticPrefs::image_mem_debug_reporting()) { + ReportImage(aHandleReport, aData, aPathPrefix, counter, + aSharedSurfaces); + } else { + ImageMemoryReporter::TrimSharedSurfaces(counter, aSharedSurfaces); + nonNotableTotal += counter; + } + } + + // Report non-notable images in aggregate. + ReportTotal(aHandleReport, aData, /* aExplicit = */ true, aPathPrefix, + "<non-notable images>/", nonNotableTotal); + + // Report a summary in aggregate, outside of the explicit tree. + ReportTotal(aHandleReport, aData, /* aExplicit = */ false, aPathPrefix, "", + summaryTotal); + } + + static void ReportImage(nsIHandleReportCallback* aHandleReport, + nsISupports* aData, const char* aPathPrefix, + const ImageMemoryCounter& aCounter, + layers::SharedSurfacesMemoryReport& aSharedSurfaces) { + nsAutoCString pathPrefix("explicit/"_ns); + pathPrefix.Append(aPathPrefix); + + switch (aCounter.Type()) { + case imgIContainer::TYPE_RASTER: + pathPrefix.AppendLiteral("/raster/"); + break; + case imgIContainer::TYPE_VECTOR: + pathPrefix.AppendLiteral("/vector/"); + break; + case imgIContainer::TYPE_REQUEST: + pathPrefix.AppendLiteral("/request/"); + break; + default: + pathPrefix.AppendLiteral("/unknown="); + pathPrefix.AppendInt(aCounter.Type()); + pathPrefix.AppendLiteral("/"); + break; + } + + pathPrefix.Append(aCounter.IsUsed() ? "used/" : "unused/"); + if (aCounter.IsValidating()) { + pathPrefix.AppendLiteral("validating/"); + } + if (aCounter.HasError()) { + pathPrefix.AppendLiteral("err/"); + } + + pathPrefix.AppendLiteral("progress="); + pathPrefix.AppendInt(aCounter.Progress(), 16); + pathPrefix.AppendLiteral("/"); + + pathPrefix.AppendLiteral("image("); + pathPrefix.AppendInt(aCounter.IntrinsicSize().width); + pathPrefix.AppendLiteral("x"); + pathPrefix.AppendInt(aCounter.IntrinsicSize().height); + pathPrefix.AppendLiteral(", "); + + if (aCounter.URI().IsEmpty()) { + pathPrefix.AppendLiteral("<unknown URI>"); + } else { + pathPrefix.Append(aCounter.URI()); + } + + pathPrefix.AppendLiteral(")/"); + + ReportSurfaces(aHandleReport, aData, pathPrefix, aCounter, aSharedSurfaces); + + ReportSourceValue(aHandleReport, aData, pathPrefix, aCounter.Values()); + } + + static void ReportSurfaces( + nsIHandleReportCallback* aHandleReport, nsISupports* aData, + const nsACString& aPathPrefix, const ImageMemoryCounter& aCounter, + layers::SharedSurfacesMemoryReport& aSharedSurfaces) { + for (const SurfaceMemoryCounter& counter : aCounter.Surfaces()) { + nsAutoCString surfacePathPrefix(aPathPrefix); + switch (counter.Type()) { + case SurfaceMemoryCounterType::NORMAL: + if (counter.IsLocked()) { + surfacePathPrefix.AppendLiteral("locked/"); + } else { + surfacePathPrefix.AppendLiteral("unlocked/"); + } + if (counter.IsFactor2()) { + surfacePathPrefix.AppendLiteral("factor2/"); + } + if (counter.CannotSubstitute()) { + surfacePathPrefix.AppendLiteral("cannot_substitute/"); + } + break; + case SurfaceMemoryCounterType::CONTAINER: + surfacePathPrefix.AppendLiteral("container/"); + break; + default: + MOZ_ASSERT_UNREACHABLE("Unknown counter type"); + break; + } + + surfacePathPrefix.AppendLiteral("types="); + surfacePathPrefix.AppendInt(counter.Values().SurfaceTypes(), 16); + surfacePathPrefix.AppendLiteral("/surface("); + surfacePathPrefix.AppendInt(counter.Key().Size().width); + surfacePathPrefix.AppendLiteral("x"); + surfacePathPrefix.AppendInt(counter.Key().Size().height); + + if (!counter.IsFinished()) { + surfacePathPrefix.AppendLiteral(", incomplete"); + } + + if (counter.Values().ExternalHandles() > 0) { + surfacePathPrefix.AppendLiteral(", handles:"); + surfacePathPrefix.AppendInt( + uint32_t(counter.Values().ExternalHandles())); + } + + ImageMemoryReporter::AppendSharedSurfacePrefix(surfacePathPrefix, counter, + aSharedSurfaces); + + PlaybackType playback = counter.Key().Playback(); + if (playback == PlaybackType::eAnimated) { + if (StaticPrefs::image_mem_debug_reporting()) { + surfacePathPrefix.AppendPrintf( + " (animation %4u)", uint32_t(counter.Values().FrameIndex())); + } else { + surfacePathPrefix.AppendLiteral(" (animation)"); + } + } + + if (counter.Key().Flags() != DefaultSurfaceFlags()) { + surfacePathPrefix.AppendLiteral(", flags:"); + surfacePathPrefix.AppendInt(uint32_t(counter.Key().Flags()), + /* aRadix = */ 16); + } + + if (counter.Key().Region()) { + const ImageIntRegion& region = counter.Key().Region().ref(); + const gfx::IntRect& rect = region.Rect(); + surfacePathPrefix.AppendLiteral(", region:[ rect=("); + surfacePathPrefix.AppendInt(rect.x); + surfacePathPrefix.AppendLiteral(","); + surfacePathPrefix.AppendInt(rect.y); + surfacePathPrefix.AppendLiteral(") "); + surfacePathPrefix.AppendInt(rect.width); + surfacePathPrefix.AppendLiteral("x"); + surfacePathPrefix.AppendInt(rect.height); + if (region.IsRestricted()) { + const gfx::IntRect& restrict = region.Restriction(); + if (restrict == rect) { + surfacePathPrefix.AppendLiteral(", restrict=rect"); + } else { + surfacePathPrefix.AppendLiteral(", restrict=("); + surfacePathPrefix.AppendInt(restrict.x); + surfacePathPrefix.AppendLiteral(","); + surfacePathPrefix.AppendInt(restrict.y); + surfacePathPrefix.AppendLiteral(") "); + surfacePathPrefix.AppendInt(restrict.width); + surfacePathPrefix.AppendLiteral("x"); + surfacePathPrefix.AppendInt(restrict.height); + } + } + if (region.GetExtendMode() != gfx::ExtendMode::CLAMP) { + surfacePathPrefix.AppendLiteral(", extendMode="); + surfacePathPrefix.AppendInt(int32_t(region.GetExtendMode())); + } + surfacePathPrefix.AppendLiteral("]"); + } + + const SVGImageContext& context = counter.Key().SVGContext(); + surfacePathPrefix.AppendLiteral(", svgContext:[ "); + if (context.GetViewportSize()) { + const CSSIntSize& size = context.GetViewportSize().ref(); + surfacePathPrefix.AppendLiteral("viewport=("); + surfacePathPrefix.AppendInt(size.width); + surfacePathPrefix.AppendLiteral("x"); + surfacePathPrefix.AppendInt(size.height); + surfacePathPrefix.AppendLiteral(") "); + } + if (context.GetPreserveAspectRatio()) { + nsAutoString aspect; + context.GetPreserveAspectRatio()->ToString(aspect); + surfacePathPrefix.AppendLiteral("preserveAspectRatio=("); + LossyAppendUTF16toASCII(aspect, surfacePathPrefix); + surfacePathPrefix.AppendLiteral(") "); + } + if (auto scheme = context.GetColorScheme()) { + surfacePathPrefix.AppendLiteral("colorScheme="); + surfacePathPrefix.AppendInt(int32_t(*scheme)); + surfacePathPrefix.AppendLiteral(" "); + } + if (context.GetContextPaint()) { + const SVGEmbeddingContextPaint* paint = context.GetContextPaint(); + surfacePathPrefix.AppendLiteral("contextPaint=("); + if (paint->GetFill()) { + surfacePathPrefix.AppendLiteral(" fill="); + surfacePathPrefix.AppendInt(paint->GetFill()->ToABGR(), 16); + } + if (paint->GetFillOpacity() != 1.0) { + surfacePathPrefix.AppendLiteral(" fillOpa="); + surfacePathPrefix.AppendFloat(paint->GetFillOpacity()); + } + if (paint->GetStroke()) { + surfacePathPrefix.AppendLiteral(" stroke="); + surfacePathPrefix.AppendInt(paint->GetStroke()->ToABGR(), 16); + } + if (paint->GetStrokeOpacity() != 1.0) { + surfacePathPrefix.AppendLiteral(" strokeOpa="); + surfacePathPrefix.AppendFloat(paint->GetStrokeOpacity()); + } + surfacePathPrefix.AppendLiteral(" ) "); + } + surfacePathPrefix.AppendLiteral("]"); + + surfacePathPrefix.AppendLiteral(")/"); + + ReportValues(aHandleReport, aData, surfacePathPrefix, counter.Values()); + } + } + + static void ReportTotal(nsIHandleReportCallback* aHandleReport, + nsISupports* aData, bool aExplicit, + const char* aPathPrefix, const char* aPathInfix, + const MemoryTotal& aTotal) { + nsAutoCString pathPrefix; + if (aExplicit) { + pathPrefix.AppendLiteral("explicit/"); + } + pathPrefix.Append(aPathPrefix); + + nsAutoCString rasterUsedPrefix(pathPrefix); + rasterUsedPrefix.AppendLiteral("/raster/used/"); + rasterUsedPrefix.Append(aPathInfix); + ReportValues(aHandleReport, aData, rasterUsedPrefix, aTotal.UsedRaster()); + + nsAutoCString rasterUnusedPrefix(pathPrefix); + rasterUnusedPrefix.AppendLiteral("/raster/unused/"); + rasterUnusedPrefix.Append(aPathInfix); + ReportValues(aHandleReport, aData, rasterUnusedPrefix, + aTotal.UnusedRaster()); + + nsAutoCString vectorUsedPrefix(pathPrefix); + vectorUsedPrefix.AppendLiteral("/vector/used/"); + vectorUsedPrefix.Append(aPathInfix); + ReportValues(aHandleReport, aData, vectorUsedPrefix, aTotal.UsedVector()); + + nsAutoCString vectorUnusedPrefix(pathPrefix); + vectorUnusedPrefix.AppendLiteral("/vector/unused/"); + vectorUnusedPrefix.Append(aPathInfix); + ReportValues(aHandleReport, aData, vectorUnusedPrefix, + aTotal.UnusedVector()); + } + + static void ReportValues(nsIHandleReportCallback* aHandleReport, + nsISupports* aData, const nsACString& aPathPrefix, + const MemoryCounter& aCounter) { + ReportSourceValue(aHandleReport, aData, aPathPrefix, aCounter); + + ReportValue(aHandleReport, aData, KIND_HEAP, aPathPrefix, "decoded-heap", + "Decoded image data which is stored on the heap.", + aCounter.DecodedHeap()); + + ReportValue(aHandleReport, aData, KIND_NONHEAP, aPathPrefix, + "decoded-nonheap", + "Decoded image data which isn't stored on the heap.", + aCounter.DecodedNonHeap()); + + // We don't know for certain whether or not it is on the heap, so let's + // just report it as non-heap for reporting purposes. + ReportValue(aHandleReport, aData, KIND_NONHEAP, aPathPrefix, + "decoded-unknown", + "Decoded image data which is unknown to be on the heap or not.", + aCounter.DecodedUnknown()); + } + + static void ReportSourceValue(nsIHandleReportCallback* aHandleReport, + nsISupports* aData, + const nsACString& aPathPrefix, + const MemoryCounter& aCounter) { + ReportValue(aHandleReport, aData, KIND_HEAP, aPathPrefix, "source", + "Raster image source data and vector image documents.", + aCounter.Source()); + } + + static void ReportValue(nsIHandleReportCallback* aHandleReport, + nsISupports* aData, int32_t aKind, + const nsACString& aPathPrefix, + const char* aPathSuffix, const char* aDescription, + size_t aValue) { + if (aValue == 0) { + return; + } + + nsAutoCString desc(aDescription); + nsAutoCString path(aPathPrefix); + path.Append(aPathSuffix); + + aHandleReport->Callback(""_ns, path, aKind, UNITS_BYTES, aValue, desc, + aData); + } + + static void RecordCounterForRequest(imgRequest* aRequest, + nsTArray<ImageMemoryCounter>* aArray, + bool aIsUsed) { + SizeOfState state(ImagesMallocSizeOf); + RefPtr<image::Image> image = aRequest->GetImage(); + if (image) { + ImageMemoryCounter counter(aRequest, image, state, aIsUsed); + aArray->AppendElement(std::move(counter)); + } else { + // We can at least record some information about the image from the + // request, and mark it as not knowing the image type yet. + ImageMemoryCounter counter(aRequest, state, aIsUsed); + aArray->AppendElement(std::move(counter)); + } + } +}; + +NS_IMPL_ISUPPORTS(imgMemoryReporter, nsIMemoryReporter) + +NS_IMPL_ISUPPORTS(nsProgressNotificationProxy, nsIProgressEventSink, + nsIChannelEventSink, nsIInterfaceRequestor) + +NS_IMETHODIMP +nsProgressNotificationProxy::OnProgress(nsIRequest* request, int64_t progress, + int64_t progressMax) { + nsCOMPtr<nsILoadGroup> loadGroup; + request->GetLoadGroup(getter_AddRefs(loadGroup)); + + nsCOMPtr<nsIProgressEventSink> target; + NS_QueryNotificationCallbacks(mOriginalCallbacks, loadGroup, + NS_GET_IID(nsIProgressEventSink), + getter_AddRefs(target)); + if (!target) { + return NS_OK; + } + return target->OnProgress(mImageRequest, progress, progressMax); +} + +NS_IMETHODIMP +nsProgressNotificationProxy::OnStatus(nsIRequest* request, nsresult status, + const char16_t* statusArg) { + nsCOMPtr<nsILoadGroup> loadGroup; + request->GetLoadGroup(getter_AddRefs(loadGroup)); + + nsCOMPtr<nsIProgressEventSink> target; + NS_QueryNotificationCallbacks(mOriginalCallbacks, loadGroup, + NS_GET_IID(nsIProgressEventSink), + getter_AddRefs(target)); + if (!target) { + return NS_OK; + } + return target->OnStatus(mImageRequest, status, statusArg); +} + +NS_IMETHODIMP +nsProgressNotificationProxy::AsyncOnChannelRedirect( + nsIChannel* oldChannel, nsIChannel* newChannel, uint32_t flags, + nsIAsyncVerifyRedirectCallback* cb) { + // Tell the original original callbacks about it too + nsCOMPtr<nsILoadGroup> loadGroup; + newChannel->GetLoadGroup(getter_AddRefs(loadGroup)); + nsCOMPtr<nsIChannelEventSink> target; + NS_QueryNotificationCallbacks(mOriginalCallbacks, loadGroup, + NS_GET_IID(nsIChannelEventSink), + getter_AddRefs(target)); + if (!target) { + cb->OnRedirectVerifyCallback(NS_OK); + return NS_OK; + } + + // Delegate to |target| if set, reusing |cb| + return target->AsyncOnChannelRedirect(oldChannel, newChannel, flags, cb); +} + +NS_IMETHODIMP +nsProgressNotificationProxy::GetInterface(const nsIID& iid, void** result) { + if (iid.Equals(NS_GET_IID(nsIProgressEventSink))) { + *result = static_cast<nsIProgressEventSink*>(this); + NS_ADDREF_THIS(); + return NS_OK; + } + if (iid.Equals(NS_GET_IID(nsIChannelEventSink))) { + *result = static_cast<nsIChannelEventSink*>(this); + NS_ADDREF_THIS(); + return NS_OK; + } + if (mOriginalCallbacks) { + return mOriginalCallbacks->GetInterface(iid, result); + } + return NS_NOINTERFACE; +} + +static void NewRequestAndEntry(bool aForcePrincipalCheckForCacheEntry, + imgLoader* aLoader, const ImageCacheKey& aKey, + imgRequest** aRequest, imgCacheEntry** aEntry) { + RefPtr<imgRequest> request = new imgRequest(aLoader, aKey); + RefPtr<imgCacheEntry> entry = + new imgCacheEntry(aLoader, request, aForcePrincipalCheckForCacheEntry); + aLoader->AddToUncachedImages(request); + request.forget(aRequest); + entry.forget(aEntry); +} + +static bool ShouldRevalidateEntry(imgCacheEntry* aEntry, nsLoadFlags aFlags, + bool aHasExpired) { + if (aFlags & nsIRequest::LOAD_BYPASS_CACHE) { + return false; + } + if (aFlags & nsIRequest::VALIDATE_ALWAYS) { + return true; + } + if (aEntry->GetMustValidate()) { + return true; + } + if (aHasExpired) { + // The cache entry has expired... Determine whether the stale cache + // entry can be used without validation... + if (aFlags & (nsIRequest::LOAD_FROM_CACHE | nsIRequest::VALIDATE_NEVER | + nsIRequest::VALIDATE_ONCE_PER_SESSION)) { + // LOAD_FROM_CACHE, VALIDATE_NEVER and VALIDATE_ONCE_PER_SESSION allow + // stale cache entries to be used unless they have been explicitly marked + // to indicate that revalidation is necessary. + return false; + } + // Entry is expired, revalidate. + return true; + } + return false; +} + +/* Call content policies on cached images that went through a redirect */ +static bool ShouldLoadCachedImage(imgRequest* aImgRequest, + Document* aLoadingDocument, + nsIPrincipal* aTriggeringPrincipal, + nsContentPolicyType aPolicyType, + bool aSendCSPViolationReports) { + /* Call content policies on cached images - Bug 1082837 + * Cached images are keyed off of the first uri in a redirect chain. + * Hence content policies don't get a chance to test the intermediate hops + * or the final destination. Here we test the final destination using + * mFinalURI off of the imgRequest and passing it into content policies. + * For Mixed Content Blocker, we do an additional check to determine if any + * of the intermediary hops went through an insecure redirect with the + * mHadInsecureRedirect flag + */ + bool insecureRedirect = aImgRequest->HadInsecureRedirect(); + nsCOMPtr<nsIURI> contentLocation; + aImgRequest->GetFinalURI(getter_AddRefs(contentLocation)); + nsresult rv; + + nsCOMPtr<nsIPrincipal> loadingPrincipal = + aLoadingDocument ? aLoadingDocument->NodePrincipal() + : aTriggeringPrincipal; + // If there is no context and also no triggeringPrincipal, then we use a fresh + // nullPrincipal as the loadingPrincipal because we can not create a loadinfo + // without a valid loadingPrincipal. + if (!loadingPrincipal) { + loadingPrincipal = NullPrincipal::CreateWithoutOriginAttributes(); + } + + nsCOMPtr<nsILoadInfo> secCheckLoadInfo = new LoadInfo( + loadingPrincipal, aTriggeringPrincipal, aLoadingDocument, + nsILoadInfo::SEC_ONLY_FOR_EXPLICIT_CONTENTSEC_CHECK, aPolicyType); + + secCheckLoadInfo->SetSendCSPViolationEvents(aSendCSPViolationReports); + + int16_t decision = nsIContentPolicy::REJECT_REQUEST; + rv = NS_CheckContentLoadPolicy(contentLocation, secCheckLoadInfo, + ""_ns, // mime guess + &decision, nsContentUtils::GetContentPolicy()); + if (NS_FAILED(rv) || !NS_CP_ACCEPTED(decision)) { + return false; + } + + // We call all Content Policies above, but we also have to call mcb + // individually to check the intermediary redirect hops are secure. + if (insecureRedirect) { + // Bug 1314356: If the image ended up in the cache upgraded by HSTS and the + // page uses upgrade-inscure-requests it had an insecure redirect + // (http->https). We need to invalidate the image and reload it because + // mixed content blocker only bails if upgrade-insecure-requests is set on + // the doc and the resource load is http: which would result in an incorrect + // mixed content warning. + nsCOMPtr<nsIDocShell> docShell = + NS_CP_GetDocShellFromContext(ToSupports(aLoadingDocument)); + if (docShell) { + Document* document = docShell->GetDocument(); + if (document && document->GetUpgradeInsecureRequests(false)) { + return false; + } + } + + if (!aTriggeringPrincipal || !aTriggeringPrincipal->IsSystemPrincipal()) { + // reset the decision for mixed content blocker check + decision = nsIContentPolicy::REJECT_REQUEST; + rv = nsMixedContentBlocker::ShouldLoad(insecureRedirect, contentLocation, + secCheckLoadInfo, + ""_ns, // mime guess + true, // aReportError + &decision); + if (NS_FAILED(rv) || !NS_CP_ACCEPTED(decision)) { + return false; + } + } + } + + return true; +} + +// Returns true if this request is compatible with the given CORS mode on the +// given loading principal, and false if the request may not be reused due +// to CORS. +static bool ValidateCORSMode(imgRequest* aRequest, bool aForcePrincipalCheck, + CORSMode aCORSMode, + nsIPrincipal* aTriggeringPrincipal) { + // If the entry's CORS mode doesn't match, or the CORS mode matches but the + // document principal isn't the same, we can't use this request. + if (aRequest->GetCORSMode() != aCORSMode) { + return false; + } + + if (aRequest->GetCORSMode() != CORS_NONE || aForcePrincipalCheck) { + nsCOMPtr<nsIPrincipal> otherprincipal = aRequest->GetTriggeringPrincipal(); + + // If we previously had a principal, but we don't now, we can't use this + // request. + if (otherprincipal && !aTriggeringPrincipal) { + return false; + } + + if (otherprincipal && aTriggeringPrincipal && + !otherprincipal->Equals(aTriggeringPrincipal)) { + return false; + } + } + + return true; +} + +static bool ValidateSecurityInfo(imgRequest* aRequest, + bool aForcePrincipalCheck, CORSMode aCORSMode, + nsIPrincipal* aTriggeringPrincipal, + Document* aLoadingDocument, + nsContentPolicyType aPolicyType) { + if (!ValidateCORSMode(aRequest, aForcePrincipalCheck, aCORSMode, + aTriggeringPrincipal)) { + return false; + } + // Content Policy Check on Cached Images + return ShouldLoadCachedImage(aRequest, aLoadingDocument, aTriggeringPrincipal, + aPolicyType, + /* aSendCSPViolationReports */ false); +} + +static nsresult NewImageChannel( + nsIChannel** aResult, + // If aForcePrincipalCheckForCacheEntry is true, then we will + // force a principal check even when not using CORS before + // assuming we have a cache hit on a cache entry that we + // create for this channel. This is an out param that should + // be set to true if this channel ends up depending on + // aTriggeringPrincipal and false otherwise. + bool* aForcePrincipalCheckForCacheEntry, nsIURI* aURI, + nsIURI* aInitialDocumentURI, CORSMode aCORSMode, + nsIReferrerInfo* aReferrerInfo, nsILoadGroup* aLoadGroup, + nsLoadFlags aLoadFlags, nsContentPolicyType aPolicyType, + nsIPrincipal* aTriggeringPrincipal, nsINode* aRequestingNode, + bool aRespectPrivacy, uint64_t aEarlyHintPreloaderId) { + MOZ_ASSERT(aResult); + + nsresult rv; + nsCOMPtr<nsIHttpChannel> newHttpChannel; + + nsCOMPtr<nsIInterfaceRequestor> callbacks; + + if (aLoadGroup) { + // Get the notification callbacks from the load group for the new channel. + // + // XXX: This is not exactly correct, because the network request could be + // referenced by multiple windows... However, the new channel needs + // something. So, using the 'first' notification callbacks is better + // than nothing... + // + aLoadGroup->GetNotificationCallbacks(getter_AddRefs(callbacks)); + } + + // Pass in a nullptr loadgroup because this is the underlying network + // request. This request may be referenced by several proxy image requests + // (possibly in different documents). + // If all of the proxy requests are canceled then this request should be + // canceled too. + // + + nsSecurityFlags securityFlags = + nsContentSecurityManager::ComputeSecurityFlags( + aCORSMode, nsContentSecurityManager::CORSSecurityMapping:: + CORS_NONE_MAPS_TO_INHERITED_CONTEXT); + + securityFlags |= nsILoadInfo::SEC_ALLOW_CHROME; + + // Note we are calling NS_NewChannelWithTriggeringPrincipal() here with a + // node and a principal. This is for things like background images that are + // specified by user stylesheets, where the document is being styled, but + // the principal is that of the user stylesheet. + if (aRequestingNode && aTriggeringPrincipal) { + rv = NS_NewChannelWithTriggeringPrincipal(aResult, aURI, aRequestingNode, + aTriggeringPrincipal, + securityFlags, aPolicyType, + nullptr, // PerformanceStorage + nullptr, // loadGroup + callbacks, aLoadFlags); + + if (NS_FAILED(rv)) { + return rv; + } + + if (aPolicyType == nsIContentPolicy::TYPE_INTERNAL_IMAGE_FAVICON) { + // If this is a favicon loading, we will use the originAttributes from the + // triggeringPrincipal as the channel's originAttributes. This allows the + // favicon loading from XUL will use the correct originAttributes. + + nsCOMPtr<nsILoadInfo> loadInfo = (*aResult)->LoadInfo(); + rv = loadInfo->SetOriginAttributes( + aTriggeringPrincipal->OriginAttributesRef()); + } + } else { + // either we are loading something inside a document, in which case + // we should always have a requestingNode, or we are loading something + // outside a document, in which case the triggeringPrincipal and + // triggeringPrincipal should always be the systemPrincipal. + // However, there are exceptions: one is Notifications which create a + // channel in the parent process in which case we can't get a + // requestingNode. + rv = NS_NewChannel(aResult, aURI, nsContentUtils::GetSystemPrincipal(), + securityFlags, aPolicyType, + nullptr, // nsICookieJarSettings + nullptr, // PerformanceStorage + nullptr, // loadGroup + callbacks, aLoadFlags); + + if (NS_FAILED(rv)) { + return rv; + } + + // Use the OriginAttributes from the loading principal, if one is available, + // and adjust the private browsing ID based on what kind of load the caller + // has asked us to perform. + OriginAttributes attrs; + if (aTriggeringPrincipal) { + attrs = aTriggeringPrincipal->OriginAttributesRef(); + } + attrs.mPrivateBrowsingId = aRespectPrivacy ? 1 : 0; + + nsCOMPtr<nsILoadInfo> loadInfo = (*aResult)->LoadInfo(); + rv = loadInfo->SetOriginAttributes(attrs); + } + + if (NS_FAILED(rv)) { + return rv; + } + + // only inherit if we have a principal + *aForcePrincipalCheckForCacheEntry = + aTriggeringPrincipal && nsContentUtils::ChannelShouldInheritPrincipal( + aTriggeringPrincipal, aURI, + /* aInheritForAboutBlank */ false, + /* aForceInherit */ false); + + // Initialize HTTP-specific attributes + newHttpChannel = do_QueryInterface(*aResult); + if (newHttpChannel) { + nsCOMPtr<nsIHttpChannelInternal> httpChannelInternal = + do_QueryInterface(newHttpChannel); + NS_ENSURE_TRUE(httpChannelInternal, NS_ERROR_UNEXPECTED); + rv = httpChannelInternal->SetDocumentURI(aInitialDocumentURI); + MOZ_ASSERT(NS_SUCCEEDED(rv)); + if (aReferrerInfo) { + DebugOnly<nsresult> rv = newHttpChannel->SetReferrerInfo(aReferrerInfo); + MOZ_ASSERT(NS_SUCCEEDED(rv)); + } + + if (aEarlyHintPreloaderId) { + rv = httpChannelInternal->SetEarlyHintPreloaderId(aEarlyHintPreloaderId); + NS_ENSURE_SUCCESS(rv, rv); + } + } + + // Image channels are loaded by default with reduced priority. + nsCOMPtr<nsISupportsPriority> p = do_QueryInterface(*aResult); + if (p) { + uint32_t priority = nsISupportsPriority::PRIORITY_LOW; + + if (aLoadFlags & nsIRequest::LOAD_BACKGROUND) { + ++priority; // further reduce priority for background loads + } + + p->AdjustPriority(priority); + } + + // Create a new loadgroup for this new channel, using the old group as + // the parent. The indirection keeps the channel insulated from cancels, + // but does allow a way for this revalidation to be associated with at + // least one base load group for scheduling/caching purposes. + + nsCOMPtr<nsILoadGroup> loadGroup = do_CreateInstance(NS_LOADGROUP_CONTRACTID); + nsCOMPtr<nsILoadGroupChild> childLoadGroup = do_QueryInterface(loadGroup); + if (childLoadGroup) { + childLoadGroup->SetParentLoadGroup(aLoadGroup); + } + (*aResult)->SetLoadGroup(loadGroup); + + return NS_OK; +} + +static uint32_t SecondsFromPRTime(PRTime aTime) { + return nsContentUtils::SecondsFromPRTime(aTime); +} + +/* static */ +imgCacheEntry::imgCacheEntry(imgLoader* loader, imgRequest* request, + bool forcePrincipalCheck) + : mLoader(loader), + mRequest(request), + mDataSize(0), + mTouchedTime(SecondsFromPRTime(PR_Now())), + mLoadTime(SecondsFromPRTime(PR_Now())), + mExpiryTime(0), + mMustValidate(false), + // We start off as evicted so we don't try to update the cache. + // PutIntoCache will set this to false. + mEvicted(true), + mHasNoProxies(true), + mForcePrincipalCheck(forcePrincipalCheck), + mHasNotified(false) {} + +imgCacheEntry::~imgCacheEntry() { + LOG_FUNC(gImgLog, "imgCacheEntry::~imgCacheEntry()"); +} + +void imgCacheEntry::Touch(bool updateTime /* = true */) { + LOG_SCOPE(gImgLog, "imgCacheEntry::Touch"); + + if (updateTime) { + mTouchedTime = SecondsFromPRTime(PR_Now()); + } + + UpdateCache(); +} + +void imgCacheEntry::UpdateCache(int32_t diff /* = 0 */) { + // Don't update the cache if we've been removed from it or it doesn't care + // about our size or usage. + if (!Evicted() && HasNoProxies()) { + mLoader->CacheEntriesChanged(diff); + } +} + +void imgCacheEntry::UpdateLoadTime() { + mLoadTime = SecondsFromPRTime(PR_Now()); +} + +void imgCacheEntry::SetHasNoProxies(bool hasNoProxies) { + if (MOZ_LOG_TEST(gImgLog, LogLevel::Debug)) { + if (hasNoProxies) { + LOG_FUNC_WITH_PARAM(gImgLog, "imgCacheEntry::SetHasNoProxies true", "uri", + mRequest->CacheKey().URI()); + } else { + LOG_FUNC_WITH_PARAM(gImgLog, "imgCacheEntry::SetHasNoProxies false", + "uri", mRequest->CacheKey().URI()); + } + } + + mHasNoProxies = hasNoProxies; +} + +imgCacheQueue::imgCacheQueue() : mDirty(false), mSize(0) {} + +void imgCacheQueue::UpdateSize(int32_t diff) { mSize += diff; } + +uint32_t imgCacheQueue::GetSize() const { return mSize; } + +void imgCacheQueue::Remove(imgCacheEntry* entry) { + uint64_t index = mQueue.IndexOf(entry); + if (index == queueContainer::NoIndex) { + return; + } + + mSize -= mQueue[index]->GetDataSize(); + + // If the queue is clean and this is the first entry, + // then we can efficiently remove the entry without + // dirtying the sort order. + if (!IsDirty() && index == 0) { + std::pop_heap(mQueue.begin(), mQueue.end(), imgLoader::CompareCacheEntries); + mQueue.RemoveLastElement(); + return; + } + + // Remove from the middle of the list. This potentially + // breaks the binary heap sort order. + mQueue.RemoveElementAt(index); + + // If we only have one entry or the queue is empty, though, + // then the sort order is still effectively good. Simply + // refresh the list to clear the dirty flag. + if (mQueue.Length() <= 1) { + Refresh(); + return; + } + + // Otherwise we must mark the queue dirty and potentially + // trigger an expensive sort later. + MarkDirty(); +} + +void imgCacheQueue::Push(imgCacheEntry* entry) { + mSize += entry->GetDataSize(); + + RefPtr<imgCacheEntry> refptr(entry); + mQueue.AppendElement(std::move(refptr)); + // If we're not dirty already, then we can efficiently add this to the + // binary heap immediately. This is only O(log n). + if (!IsDirty()) { + std::push_heap(mQueue.begin(), mQueue.end(), + imgLoader::CompareCacheEntries); + } +} + +already_AddRefed<imgCacheEntry> imgCacheQueue::Pop() { + if (mQueue.IsEmpty()) { + return nullptr; + } + if (IsDirty()) { + Refresh(); + } + + std::pop_heap(mQueue.begin(), mQueue.end(), imgLoader::CompareCacheEntries); + RefPtr<imgCacheEntry> entry = mQueue.PopLastElement(); + + mSize -= entry->GetDataSize(); + return entry.forget(); +} + +void imgCacheQueue::Refresh() { + // Resort the list. This is an O(3 * n) operation and best avoided + // if possible. + std::make_heap(mQueue.begin(), mQueue.end(), imgLoader::CompareCacheEntries); + mDirty = false; +} + +void imgCacheQueue::MarkDirty() { mDirty = true; } + +bool imgCacheQueue::IsDirty() { return mDirty; } + +uint32_t imgCacheQueue::GetNumElements() const { return mQueue.Length(); } + +bool imgCacheQueue::Contains(imgCacheEntry* aEntry) const { + return mQueue.Contains(aEntry); +} + +imgCacheQueue::iterator imgCacheQueue::begin() { return mQueue.begin(); } + +imgCacheQueue::const_iterator imgCacheQueue::begin() const { + return mQueue.begin(); +} + +imgCacheQueue::iterator imgCacheQueue::end() { return mQueue.end(); } + +imgCacheQueue::const_iterator imgCacheQueue::end() const { + return mQueue.end(); +} + +nsresult imgLoader::CreateNewProxyForRequest( + imgRequest* aRequest, nsIURI* aURI, nsILoadGroup* aLoadGroup, + Document* aLoadingDocument, imgINotificationObserver* aObserver, + nsLoadFlags aLoadFlags, imgRequestProxy** _retval) { + LOG_SCOPE_WITH_PARAM(gImgLog, "imgLoader::CreateNewProxyForRequest", + "imgRequest", aRequest); + + /* XXX If we move decoding onto separate threads, we should save off the + calling thread here and pass it off to |proxyRequest| so that it call + proxy calls to |aObserver|. + */ + + RefPtr<imgRequestProxy> proxyRequest = new imgRequestProxy(); + + /* It is important to call |SetLoadFlags()| before calling |Init()| because + |Init()| adds the request to the loadgroup. + */ + proxyRequest->SetLoadFlags(aLoadFlags); + + // init adds itself to imgRequest's list of observers + nsresult rv = proxyRequest->Init(aRequest, aLoadGroup, aLoadingDocument, aURI, + aObserver); + if (NS_WARN_IF(NS_FAILED(rv))) { + return rv; + } + + proxyRequest.forget(_retval); + return NS_OK; +} + +class imgCacheExpirationTracker final + : public nsExpirationTracker<imgCacheEntry, 3> { + enum { TIMEOUT_SECONDS = 10 }; + + public: + imgCacheExpirationTracker(); + + protected: + void NotifyExpired(imgCacheEntry* entry) override; +}; + +imgCacheExpirationTracker::imgCacheExpirationTracker() + : nsExpirationTracker<imgCacheEntry, 3>(TIMEOUT_SECONDS * 1000, + "imgCacheExpirationTracker") {} + +void imgCacheExpirationTracker::NotifyExpired(imgCacheEntry* entry) { + // Hold on to a reference to this entry, because the expiration tracker + // mechanism doesn't. + RefPtr<imgCacheEntry> kungFuDeathGrip(entry); + + if (MOZ_LOG_TEST(gImgLog, LogLevel::Debug)) { + RefPtr<imgRequest> req = entry->GetRequest(); + if (req) { + LOG_FUNC_WITH_PARAM(gImgLog, "imgCacheExpirationTracker::NotifyExpired", + "entry", req->CacheKey().URI()); + } + } + + // We can be called multiple times on the same entry. Don't do work multiple + // times. + if (!entry->Evicted()) { + entry->Loader()->RemoveFromCache(entry); + } + + entry->Loader()->VerifyCacheSizes(); +} + +/////////////////////////////////////////////////////////////////////////////// +// imgLoader +/////////////////////////////////////////////////////////////////////////////// + +double imgLoader::sCacheTimeWeight; +uint32_t imgLoader::sCacheMaxSize; +imgMemoryReporter* imgLoader::sMemReporter; + +NS_IMPL_ISUPPORTS(imgLoader, imgILoader, nsIContentSniffer, imgICache, + nsISupportsWeakReference, nsIObserver) + +static imgLoader* gNormalLoader = nullptr; +static imgLoader* gPrivateBrowsingLoader = nullptr; + +/* static */ +already_AddRefed<imgLoader> imgLoader::CreateImageLoader() { + // In some cases, such as xpctests, XPCOM modules are not automatically + // initialized. We need to make sure that our module is initialized before + // we hand out imgLoader instances and code starts using them. + mozilla::image::EnsureModuleInitialized(); + + RefPtr<imgLoader> loader = new imgLoader(); + loader->Init(); + + return loader.forget(); +} + +imgLoader* imgLoader::NormalLoader() { + if (!gNormalLoader) { + gNormalLoader = CreateImageLoader().take(); + } + return gNormalLoader; +} + +imgLoader* imgLoader::PrivateBrowsingLoader() { + if (!gPrivateBrowsingLoader) { + gPrivateBrowsingLoader = CreateImageLoader().take(); + gPrivateBrowsingLoader->RespectPrivacyNotifications(); + } + return gPrivateBrowsingLoader; +} + +imgLoader::imgLoader() + : mUncachedImagesMutex("imgLoader::UncachedImages"), + mRespectPrivacy(false) { + sMemReporter->AddRef(); + sMemReporter->RegisterLoader(this); +} + +imgLoader::~imgLoader() { + ClearImageCache(); + { + // If there are any of our imgRequest's left they are in the uncached + // images set, so clear their pointer to us. + MutexAutoLock lock(mUncachedImagesMutex); + for (RefPtr<imgRequest> req : mUncachedImages) { + req->ClearLoader(); + } + } + sMemReporter->UnregisterLoader(this); + sMemReporter->Release(); +} + +void imgLoader::VerifyCacheSizes() { +#ifdef DEBUG + if (!mCacheTracker) { + return; + } + + uint32_t cachesize = mCache.Count(); + uint32_t queuesize = mCacheQueue.GetNumElements(); + uint32_t trackersize = 0; + for (nsExpirationTracker<imgCacheEntry, 3>::Iterator it(mCacheTracker.get()); + it.Next();) { + trackersize++; + } + MOZ_ASSERT(queuesize == trackersize, "Queue and tracker sizes out of sync!"); + MOZ_ASSERT(queuesize <= cachesize, "Queue has more elements than cache!"); +#endif +} + +void imgLoader::GlobalInit() { + sCacheTimeWeight = StaticPrefs::image_cache_timeweight_AtStartup() / 1000.0; + int32_t cachesize = StaticPrefs::image_cache_size_AtStartup(); + sCacheMaxSize = cachesize > 0 ? cachesize : 0; + + sMemReporter = new imgMemoryReporter(); + RegisterStrongAsyncMemoryReporter(sMemReporter); + RegisterImagesContentUsedUncompressedDistinguishedAmount( + imgMemoryReporter::ImagesContentUsedUncompressedDistinguishedAmount); +} + +void imgLoader::ShutdownMemoryReporter() { + UnregisterImagesContentUsedUncompressedDistinguishedAmount(); + UnregisterStrongMemoryReporter(sMemReporter); +} + +nsresult imgLoader::InitCache() { + nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService(); + if (!os) { + return NS_ERROR_FAILURE; + } + + os->AddObserver(this, "memory-pressure", false); + os->AddObserver(this, "chrome-flush-caches", false); + os->AddObserver(this, "last-pb-context-exited", false); + os->AddObserver(this, "profile-before-change", false); + os->AddObserver(this, "xpcom-shutdown", false); + + mCacheTracker = MakeUnique<imgCacheExpirationTracker>(); + + return NS_OK; +} + +nsresult imgLoader::Init() { + InitCache(); + + return NS_OK; +} + +NS_IMETHODIMP +imgLoader::RespectPrivacyNotifications() { + mRespectPrivacy = true; + return NS_OK; +} + +NS_IMETHODIMP +imgLoader::Observe(nsISupports* aSubject, const char* aTopic, + const char16_t* aData) { + if (strcmp(aTopic, "memory-pressure") == 0) { + MinimizeCache(); + } else if (strcmp(aTopic, "chrome-flush-caches") == 0) { + MinimizeCache(); + ClearImageCache({ClearOption::ChromeOnly}); + } else if (strcmp(aTopic, "last-pb-context-exited") == 0) { + if (mRespectPrivacy) { + ClearImageCache(); + } + } else if (strcmp(aTopic, "profile-before-change") == 0) { + mCacheTracker = nullptr; + } else if (strcmp(aTopic, "xpcom-shutdown") == 0) { + mCacheTracker = nullptr; + ShutdownMemoryReporter(); + + } else { + // (Nothing else should bring us here) + MOZ_ASSERT(0, "Invalid topic received"); + } + + return NS_OK; +} + +NS_IMETHODIMP +imgLoader::ClearCache(bool chrome) { + if (XRE_IsParentProcess()) { + bool privateLoader = this == gPrivateBrowsingLoader; + for (auto* cp : ContentParent::AllProcesses(ContentParent::eLive)) { + Unused << cp->SendClearImageCache(privateLoader, chrome); + } + } + ClearOptions options; + if (chrome) { + options += ClearOption::ChromeOnly; + } + return ClearImageCache(options); +} + +NS_IMETHODIMP +imgLoader::RemoveEntriesFromPrincipalInAllProcesses(nsIPrincipal* aPrincipal) { + if (!XRE_IsParentProcess()) { + return NS_ERROR_NOT_AVAILABLE; + } + + for (auto* cp : ContentParent::AllProcesses(ContentParent::eLive)) { + Unused << cp->SendClearImageCacheFromPrincipal(aPrincipal); + } + + imgLoader* loader; + if (aPrincipal->OriginAttributesRef().mPrivateBrowsingId == + nsIScriptSecurityManager::DEFAULT_PRIVATE_BROWSING_ID) { + loader = imgLoader::NormalLoader(); + } else { + loader = imgLoader::PrivateBrowsingLoader(); + } + + return loader->RemoveEntriesInternal(aPrincipal, nullptr); +} + +NS_IMETHODIMP +imgLoader::RemoveEntriesFromBaseDomainInAllProcesses( + const nsACString& aBaseDomain) { + if (!XRE_IsParentProcess()) { + return NS_ERROR_NOT_AVAILABLE; + } + + for (auto* cp : ContentParent::AllProcesses(ContentParent::eLive)) { + Unused << cp->SendClearImageCacheFromBaseDomain(aBaseDomain); + } + + return RemoveEntriesInternal(nullptr, &aBaseDomain); +} + +nsresult imgLoader::RemoveEntriesInternal(nsIPrincipal* aPrincipal, + const nsACString* aBaseDomain) { + // Can only clear by either principal or base domain. + if ((!aPrincipal && !aBaseDomain) || (aPrincipal && aBaseDomain)) { + return NS_ERROR_INVALID_ARG; + } + + nsAutoString origin; + if (aPrincipal) { + nsresult rv = nsContentUtils::GetUTFOrigin(aPrincipal, origin); + if (NS_WARN_IF(NS_FAILED(rv))) { + return rv; + } + } + + nsCOMPtr<nsIEffectiveTLDService> tldService; + AutoTArray<RefPtr<imgCacheEntry>, 128> entriesToBeRemoved; + + // For base domain we only clear the non-chrome cache. + for (const auto& entry : mCache) { + const auto& key = entry.GetKey(); + + const bool shouldRemove = [&] { + if (aPrincipal) { + if (key.OriginAttributesRef() != + BasePrincipal::Cast(aPrincipal)->OriginAttributesRef()) { + return false; + } + + nsAutoString imageOrigin; + nsresult rv = nsContentUtils::GetUTFOrigin(key.URI(), imageOrigin); + if (NS_WARN_IF(NS_FAILED(rv))) { + return false; + } + + return imageOrigin == origin; + } + + if (!aBaseDomain) { + return false; + } + // Clear by baseDomain. + nsAutoCString host; + nsresult rv = key.URI()->GetHost(host); + if (NS_FAILED(rv) || host.IsEmpty()) { + return false; + } + + if (!tldService) { + tldService = do_GetService(NS_EFFECTIVETLDSERVICE_CONTRACTID); + } + if (NS_WARN_IF(!tldService)) { + return false; + } + + bool hasRootDomain = false; + rv = tldService->HasRootDomain(host, *aBaseDomain, &hasRootDomain); + if (NS_SUCCEEDED(rv) && hasRootDomain) { + return true; + } + + // If we don't get a direct base domain match, also check for cache of + // third parties partitioned under aBaseDomain. + + // The isolation key is either just the base domain, or an origin suffix + // which contains the partitionKey holding the baseDomain. + + if (key.IsolationKeyRef().Equals(*aBaseDomain)) { + return true; + } + + // The isolation key does not match the given base domain. It may be an + // origin suffix. Parse it into origin attributes. + OriginAttributes attrs; + if (!attrs.PopulateFromSuffix(key.IsolationKeyRef())) { + // Key is not an origin suffix. + return false; + } + + return StoragePrincipalHelper::PartitionKeyHasBaseDomain( + attrs.mPartitionKey, *aBaseDomain); + }(); + + if (shouldRemove) { + entriesToBeRemoved.AppendElement(entry.GetData()); + } + } + + for (auto& entry : entriesToBeRemoved) { + if (!RemoveFromCache(entry)) { + NS_WARNING( + "Couldn't remove an entry from the cache in " + "RemoveEntriesInternal()\n"); + } + } + + return NS_OK; +} + +constexpr auto AllCORSModes() { + return MakeInclusiveEnumeratedRange(kFirstCORSMode, kLastCORSMode); +} + +NS_IMETHODIMP +imgLoader::RemoveEntry(nsIURI* aURI, Document* aDoc) { + if (!aURI) { + return NS_OK; + } + OriginAttributes attrs; + if (aDoc) { + attrs = aDoc->NodePrincipal()->OriginAttributesRef(); + } + for (auto corsMode : AllCORSModes()) { + ImageCacheKey key(aURI, corsMode, attrs, aDoc); + RemoveFromCache(key); + } + return NS_OK; +} + +NS_IMETHODIMP +imgLoader::FindEntryProperties(nsIURI* uri, Document* aDoc, + nsIProperties** _retval) { + *_retval = nullptr; + + OriginAttributes attrs; + if (aDoc) { + nsCOMPtr<nsIPrincipal> principal = aDoc->NodePrincipal(); + if (principal) { + attrs = principal->OriginAttributesRef(); + } + } + + for (auto corsMode : AllCORSModes()) { + ImageCacheKey key(uri, corsMode, attrs, aDoc); + RefPtr<imgCacheEntry> entry; + if (!mCache.Get(key, getter_AddRefs(entry)) || !entry) { + continue; + } + if (mCacheTracker && entry->HasNoProxies()) { + mCacheTracker->MarkUsed(entry); + } + RefPtr<imgRequest> request = entry->GetRequest(); + if (request) { + nsCOMPtr<nsIProperties> properties = request->Properties(); + properties.forget(_retval); + return NS_OK; + } + } + return NS_OK; +} + +NS_IMETHODIMP_(void) +imgLoader::ClearCacheForControlledDocument(Document* aDoc) { + MOZ_ASSERT(aDoc); + AutoTArray<RefPtr<imgCacheEntry>, 128> entriesToBeRemoved; + for (const auto& entry : mCache) { + const auto& key = entry.GetKey(); + if (key.ControlledDocument() == aDoc) { + entriesToBeRemoved.AppendElement(entry.GetData()); + } + } + for (auto& entry : entriesToBeRemoved) { + if (!RemoveFromCache(entry)) { + NS_WARNING( + "Couldn't remove an entry from the cache in " + "ClearCacheForControlledDocument()\n"); + } + } +} + +void imgLoader::Shutdown() { + NS_IF_RELEASE(gNormalLoader); + gNormalLoader = nullptr; + NS_IF_RELEASE(gPrivateBrowsingLoader); + gPrivateBrowsingLoader = nullptr; +} + +bool imgLoader::PutIntoCache(const ImageCacheKey& aKey, imgCacheEntry* entry) { + LOG_STATIC_FUNC_WITH_PARAM(gImgLog, "imgLoader::PutIntoCache", "uri", + aKey.URI()); + + // Check to see if this request already exists in the cache. If so, we'll + // replace the old version. + RefPtr<imgCacheEntry> tmpCacheEntry; + if (mCache.Get(aKey, getter_AddRefs(tmpCacheEntry)) && tmpCacheEntry) { + MOZ_LOG( + gImgLog, LogLevel::Debug, + ("[this=%p] imgLoader::PutIntoCache -- Element already in the cache", + nullptr)); + RefPtr<imgRequest> tmpRequest = tmpCacheEntry->GetRequest(); + + // If it already exists, and we're putting the same key into the cache, we + // should remove the old version. + MOZ_LOG(gImgLog, LogLevel::Debug, + ("[this=%p] imgLoader::PutIntoCache -- Replacing cached element", + nullptr)); + + RemoveFromCache(aKey); + } else { + MOZ_LOG(gImgLog, LogLevel::Debug, + ("[this=%p] imgLoader::PutIntoCache --" + " Element NOT already in the cache", + nullptr)); + } + + mCache.InsertOrUpdate(aKey, RefPtr{entry}); + + // We can be called to resurrect an evicted entry. + if (entry->Evicted()) { + entry->SetEvicted(false); + } + + // If we're resurrecting an entry with no proxies, put it back in the + // tracker and queue. + if (entry->HasNoProxies()) { + nsresult addrv = NS_OK; + + if (mCacheTracker) { + addrv = mCacheTracker->AddObject(entry); + } + + if (NS_SUCCEEDED(addrv)) { + mCacheQueue.Push(entry); + } + } + + RefPtr<imgRequest> request = entry->GetRequest(); + request->SetIsInCache(true); + RemoveFromUncachedImages(request); + + return true; +} + +bool imgLoader::SetHasNoProxies(imgRequest* aRequest, imgCacheEntry* aEntry) { + LOG_STATIC_FUNC_WITH_PARAM(gImgLog, "imgLoader::SetHasNoProxies", "uri", + aRequest->CacheKey().URI()); + + aEntry->SetHasNoProxies(true); + + if (aEntry->Evicted()) { + return false; + } + + nsresult addrv = NS_OK; + + if (mCacheTracker) { + addrv = mCacheTracker->AddObject(aEntry); + } + + if (NS_SUCCEEDED(addrv)) { + mCacheQueue.Push(aEntry); + } + + return true; +} + +bool imgLoader::SetHasProxies(imgRequest* aRequest) { + VerifyCacheSizes(); + + const ImageCacheKey& key = aRequest->CacheKey(); + + LOG_STATIC_FUNC_WITH_PARAM(gImgLog, "imgLoader::SetHasProxies", "uri", + key.URI()); + + RefPtr<imgCacheEntry> entry; + if (mCache.Get(key, getter_AddRefs(entry)) && entry) { + // Make sure the cache entry is for the right request + RefPtr<imgRequest> entryRequest = entry->GetRequest(); + if (entryRequest == aRequest && entry->HasNoProxies()) { + mCacheQueue.Remove(entry); + + if (mCacheTracker) { + mCacheTracker->RemoveObject(entry); + } + + entry->SetHasNoProxies(false); + + return true; + } + } + + return false; +} + +void imgLoader::CacheEntriesChanged(int32_t aSizeDiff /* = 0 */) { + // We only need to dirty the queue if there is any sorting + // taking place. Empty or single-entry lists can't become + // dirty. + if (mCacheQueue.GetNumElements() > 1) { + mCacheQueue.MarkDirty(); + } + mCacheQueue.UpdateSize(aSizeDiff); +} + +void imgLoader::CheckCacheLimits() { + if (mCacheQueue.GetNumElements() == 0) { + NS_ASSERTION(mCacheQueue.GetSize() == 0, + "imgLoader::CheckCacheLimits -- incorrect cache size"); + } + + // Remove entries from the cache until we're back at our desired max size. + while (mCacheQueue.GetSize() > sCacheMaxSize) { + // Remove the first entry in the queue. + RefPtr<imgCacheEntry> entry(mCacheQueue.Pop()); + + NS_ASSERTION(entry, "imgLoader::CheckCacheLimits -- NULL entry pointer"); + + if (MOZ_LOG_TEST(gImgLog, LogLevel::Debug)) { + RefPtr<imgRequest> req = entry->GetRequest(); + if (req) { + LOG_STATIC_FUNC_WITH_PARAM(gImgLog, "imgLoader::CheckCacheLimits", + "entry", req->CacheKey().URI()); + } + } + + if (entry) { + // We just popped this entry from the queue, so pass AlreadyRemoved + // to avoid searching the queue again in RemoveFromCache. + RemoveFromCache(entry, QueueState::AlreadyRemoved); + } + } +} + +bool imgLoader::ValidateRequestWithNewChannel( + imgRequest* request, nsIURI* aURI, nsIURI* aInitialDocumentURI, + nsIReferrerInfo* aReferrerInfo, nsILoadGroup* aLoadGroup, + imgINotificationObserver* aObserver, Document* aLoadingDocument, + uint64_t aInnerWindowId, nsLoadFlags aLoadFlags, + nsContentPolicyType aLoadPolicyType, imgRequestProxy** aProxyRequest, + nsIPrincipal* aTriggeringPrincipal, CORSMode aCORSMode, bool aLinkPreload, + uint64_t aEarlyHintPreloaderId, bool* aNewChannelCreated) { + // now we need to insert a new channel request object in between the real + // request and the proxy that basically delays loading the image until it + // gets a 304 or figures out that this needs to be a new request + + nsresult rv; + + // If we're currently in the middle of validating this request, just hand + // back a proxy to it; the required work will be done for us. + if (imgCacheValidator* validator = request->GetValidator()) { + rv = CreateNewProxyForRequest(request, aURI, aLoadGroup, aLoadingDocument, + aObserver, aLoadFlags, aProxyRequest); + if (NS_FAILED(rv)) { + return false; + } + + if (*aProxyRequest) { + imgRequestProxy* proxy = static_cast<imgRequestProxy*>(*aProxyRequest); + + // We will send notifications from imgCacheValidator::OnStartRequest(). + // In the mean time, we must defer notifications because we are added to + // the imgRequest's proxy list, and we can get extra notifications + // resulting from methods such as StartDecoding(). See bug 579122. + proxy->MarkValidating(); + + if (aLinkPreload) { + MOZ_ASSERT(aLoadingDocument); + proxy->PrioritizeAsPreload(); + auto preloadKey = PreloadHashKey::CreateAsImage( + aURI, aTriggeringPrincipal, aCORSMode); + proxy->NotifyOpen(preloadKey, aLoadingDocument, true); + } + + // Attach the proxy without notifying + validator->AddProxy(proxy); + } + + return true; + } + // We will rely on Necko to cache this request when it's possible, and to + // tell imgCacheValidator::OnStartRequest whether the request came from its + // cache. + nsCOMPtr<nsIChannel> newChannel; + bool forcePrincipalCheck; + rv = + NewImageChannel(getter_AddRefs(newChannel), &forcePrincipalCheck, aURI, + aInitialDocumentURI, aCORSMode, aReferrerInfo, aLoadGroup, + aLoadFlags, aLoadPolicyType, aTriggeringPrincipal, + aLoadingDocument, mRespectPrivacy, aEarlyHintPreloaderId); + if (NS_FAILED(rv)) { + return false; + } + + if (aNewChannelCreated) { + *aNewChannelCreated = true; + } + + RefPtr<imgRequestProxy> req; + rv = CreateNewProxyForRequest(request, aURI, aLoadGroup, aLoadingDocument, + aObserver, aLoadFlags, getter_AddRefs(req)); + if (NS_FAILED(rv)) { + return false; + } + + // Make sure that OnStatus/OnProgress calls have the right request set... + RefPtr<nsProgressNotificationProxy> progressproxy = + new nsProgressNotificationProxy(newChannel, req); + if (!progressproxy) { + return false; + } + + RefPtr<imgCacheValidator> hvc = + new imgCacheValidator(progressproxy, this, request, aLoadingDocument, + aInnerWindowId, forcePrincipalCheck); + + // Casting needed here to get past multiple inheritance. + nsCOMPtr<nsIStreamListener> listener = + do_QueryInterface(static_cast<nsIThreadRetargetableStreamListener*>(hvc)); + NS_ENSURE_TRUE(listener, false); + + // We must set the notification callbacks before setting up the + // CORS listener, because that's also interested inthe + // notification callbacks. + newChannel->SetNotificationCallbacks(hvc); + + request->SetValidator(hvc); + + // We will send notifications from imgCacheValidator::OnStartRequest(). + // In the mean time, we must defer notifications because we are added to + // the imgRequest's proxy list, and we can get extra notifications + // resulting from methods such as StartDecoding(). See bug 579122. + req->MarkValidating(); + + if (aLinkPreload) { + MOZ_ASSERT(aLoadingDocument); + req->PrioritizeAsPreload(); + auto preloadKey = + PreloadHashKey::CreateAsImage(aURI, aTriggeringPrincipal, aCORSMode); + req->NotifyOpen(preloadKey, aLoadingDocument, true); + } + + // Add the proxy without notifying + hvc->AddProxy(req); + + mozilla::net::PredictorLearn(aURI, aInitialDocumentURI, + nsINetworkPredictor::LEARN_LOAD_SUBRESOURCE, + aLoadGroup); + rv = newChannel->AsyncOpen(listener); + if (NS_WARN_IF(NS_FAILED(rv))) { + req->CancelAndForgetObserver(rv); + // This will notify any current or future <link preload> tags. Pass the + // non-open channel so that we can read loadinfo and referrer info of that + // channel. + req->NotifyStart(newChannel); + // Use the non-channel overload of this method to force the notification to + // happen. The preload request has not been assigned a channel. + req->NotifyStop(rv); + return false; + } + + req.forget(aProxyRequest); + return true; +} + +void imgLoader::NotifyObserversForCachedImage( + imgCacheEntry* aEntry, imgRequest* request, nsIURI* aURI, + nsIReferrerInfo* aReferrerInfo, Document* aLoadingDocument, + nsIPrincipal* aTriggeringPrincipal, CORSMode aCORSMode, + uint64_t aEarlyHintPreloaderId) { + if (aEntry->HasNotified()) { + return; + } + + nsCOMPtr<nsIObserverService> obsService = services::GetObserverService(); + + if (!obsService->HasObservers("http-on-image-cache-response")) { + return; + } + + aEntry->SetHasNotified(); + + nsCOMPtr<nsIChannel> newChannel; + bool forcePrincipalCheck; + nsresult rv = NewImageChannel( + getter_AddRefs(newChannel), &forcePrincipalCheck, aURI, nullptr, + aCORSMode, aReferrerInfo, nullptr, 0, + nsIContentPolicy::TYPE_INTERNAL_IMAGE, aTriggeringPrincipal, + aLoadingDocument, mRespectPrivacy, aEarlyHintPreloaderId); + if (NS_FAILED(rv)) { + return; + } + + RefPtr<HttpBaseChannel> httpBaseChannel = do_QueryObject(newChannel); + if (httpBaseChannel) { + httpBaseChannel->SetDummyChannelForImageCache(); + newChannel->SetContentType(nsDependentCString(request->GetMimeType())); + RefPtr<mozilla::image::Image> image = request->GetImage(); + if (image) { + newChannel->SetContentLength(aEntry->GetDataSize()); + } + obsService->NotifyObservers(newChannel, "http-on-image-cache-response", + nullptr); + } +} + +bool imgLoader::ValidateEntry( + imgCacheEntry* aEntry, nsIURI* aURI, nsIURI* aInitialDocumentURI, + nsIReferrerInfo* aReferrerInfo, nsILoadGroup* aLoadGroup, + imgINotificationObserver* aObserver, Document* aLoadingDocument, + nsLoadFlags aLoadFlags, nsContentPolicyType aLoadPolicyType, + bool aCanMakeNewChannel, bool* aNewChannelCreated, + imgRequestProxy** aProxyRequest, nsIPrincipal* aTriggeringPrincipal, + CORSMode aCORSMode, bool aLinkPreload, uint64_t aEarlyHintPreloaderId) { + LOG_SCOPE(gImgLog, "imgLoader::ValidateEntry"); + + // If the expiration time is zero, then the request has not gotten far enough + // to know when it will expire, or we know it will never expire (see + // nsContentUtils::GetSubresourceCacheValidationInfo). + uint32_t expiryTime = aEntry->GetExpiryTime(); + bool hasExpired = expiryTime && expiryTime <= SecondsFromPRTime(PR_Now()); + + nsresult rv; + + // Special treatment for file URLs - aEntry has expired if file has changed + nsCOMPtr<nsIFileURL> fileUrl(do_QueryInterface(aURI)); + if (fileUrl) { + uint32_t lastModTime = aEntry->GetLoadTime(); + + nsCOMPtr<nsIFile> theFile; + rv = fileUrl->GetFile(getter_AddRefs(theFile)); + if (NS_SUCCEEDED(rv)) { + PRTime fileLastMod; + rv = theFile->GetLastModifiedTime(&fileLastMod); + if (NS_SUCCEEDED(rv)) { + // nsIFile uses millisec, NSPR usec + fileLastMod *= 1000; + hasExpired = SecondsFromPRTime((PRTime)fileLastMod) > lastModTime; + } + } + } + + RefPtr<imgRequest> request(aEntry->GetRequest()); + + if (!request) { + return false; + } + + if (!ValidateSecurityInfo(request, aEntry->ForcePrincipalCheck(), aCORSMode, + aTriggeringPrincipal, aLoadingDocument, + aLoadPolicyType)) { + return false; + } + + // data URIs are immutable and by their nature can't leak data, so we can + // just return true in that case. Doing so would mean that shift-reload + // doesn't reload data URI documents/images though (which is handy for + // debugging during gecko development) so we make an exception in that case. + if (aURI->SchemeIs("data") && !(aLoadFlags & nsIRequest::LOAD_BYPASS_CACHE)) { + return true; + } + + bool validateRequest = false; + + if (!request->CanReuseWithoutValidation(aLoadingDocument)) { + // If we would need to revalidate this entry, but we're being told to + // bypass the cache, we don't allow this entry to be used. + if (aLoadFlags & nsIRequest::LOAD_BYPASS_CACHE) { + return false; + } + + if (MOZ_UNLIKELY(ChaosMode::isActive(ChaosFeature::ImageCache))) { + if (ChaosMode::randomUint32LessThan(4) < 1) { + return false; + } + } + + // Determine whether the cache aEntry must be revalidated... + validateRequest = ShouldRevalidateEntry(aEntry, aLoadFlags, hasExpired); + + MOZ_LOG(gImgLog, LogLevel::Debug, + ("imgLoader::ValidateEntry validating cache entry. " + "validateRequest = %d", + validateRequest)); + } else if (!aLoadingDocument && MOZ_LOG_TEST(gImgLog, LogLevel::Debug)) { + MOZ_LOG(gImgLog, LogLevel::Debug, + ("imgLoader::ValidateEntry BYPASSING cache validation for %s " + "because of NULL loading document", + aURI->GetSpecOrDefault().get())); + } + + // If the original request is still transferring don't kick off a validation + // network request because it is a bit silly to issue a validation request if + // the original request hasn't even finished yet. So just return true + // indicating the caller can create a new proxy for the request and use it as + // is. + // This is an optimization but it's also required for correctness. If we don't + // do this then when firing the load complete notification for the original + // request that can unblock load for the document and then spin the event loop + // (see the stack in bug 1641682) which then the OnStartRequest for the + // validation request can fire which can call UpdateProxies and can sync + // notify on the progress tracker about all existing state, which includes + // load complete, so we fire a second load complete notification for the + // image. + // In addition, we want to validate if the original request encountered + // an error for two reasons. The first being if the error was a network error + // then trying to re-fetch the image might succeed. The second is more + // complicated. We decide if we should fire the load or error event for img + // elements depending on if the image has error in its status at the time when + // the load complete notification is received, and we set error status on an + // image if it encounters a network error or a decode error with no real way + // to tell them apart. So if we load an image that will produce a decode error + // the first time we will usually fire the load event, and then decode enough + // to encounter the decode error and set the error status on the image. The + // next time we reference the image in the same document the load complete + // notification is replayed and this time the error status from the decode is + // already present so we fire the error event instead of the load event. This + // is a bug (bug 1645576) that we should fix. In order to avoid that bug in + // some cases (specifically the cases when we hit this code and try to + // validate the request) we make sure to validate. This avoids the bug because + // when the load complete notification arrives the proxy is marked as + // validating so it lies about its status and returns nothing. + bool requestComplete = false; + RefPtr<ProgressTracker> tracker; + RefPtr<mozilla::image::Image> image = request->GetImage(); + if (image) { + tracker = image->GetProgressTracker(); + } else { + tracker = request->GetProgressTracker(); + } + if (tracker) { + if (tracker->GetProgress() & (FLAG_LOAD_COMPLETE | FLAG_HAS_ERROR)) { + requestComplete = true; + } + } + if (!requestComplete) { + return true; + } + + if (validateRequest && aCanMakeNewChannel) { + LOG_SCOPE(gImgLog, "imgLoader::ValidateRequest |cache hit| must validate"); + + uint64_t innerWindowID = + aLoadingDocument ? aLoadingDocument->InnerWindowID() : 0; + return ValidateRequestWithNewChannel( + request, aURI, aInitialDocumentURI, aReferrerInfo, aLoadGroup, + aObserver, aLoadingDocument, innerWindowID, aLoadFlags, aLoadPolicyType, + aProxyRequest, aTriggeringPrincipal, aCORSMode, aLinkPreload, + aEarlyHintPreloaderId, aNewChannelCreated); + } + + if (!validateRequest) { + NotifyObserversForCachedImage(aEntry, request, aURI, aReferrerInfo, + aLoadingDocument, aTriggeringPrincipal, + aCORSMode, aEarlyHintPreloaderId); + } + + return !validateRequest; +} + +bool imgLoader::RemoveFromCache(const ImageCacheKey& aKey) { + LOG_STATIC_FUNC_WITH_PARAM(gImgLog, "imgLoader::RemoveFromCache", "uri", + aKey.URI()); + RefPtr<imgCacheEntry> entry; + mCache.Remove(aKey, getter_AddRefs(entry)); + if (entry) { + MOZ_ASSERT(!entry->Evicted(), "Evicting an already-evicted cache entry!"); + + // Entries with no proxies are in the tracker. + if (entry->HasNoProxies()) { + if (mCacheTracker) { + mCacheTracker->RemoveObject(entry); + } + mCacheQueue.Remove(entry); + } + + entry->SetEvicted(true); + + RefPtr<imgRequest> request = entry->GetRequest(); + request->SetIsInCache(false); + AddToUncachedImages(request); + + return true; + } + return false; +} + +bool imgLoader::RemoveFromCache(imgCacheEntry* entry, QueueState aQueueState) { + LOG_STATIC_FUNC(gImgLog, "imgLoader::RemoveFromCache entry"); + + RefPtr<imgRequest> request = entry->GetRequest(); + if (request) { + const ImageCacheKey& key = request->CacheKey(); + LOG_STATIC_FUNC_WITH_PARAM(gImgLog, "imgLoader::RemoveFromCache", + "entry's uri", key.URI()); + + mCache.Remove(key); + + if (entry->HasNoProxies()) { + LOG_STATIC_FUNC(gImgLog, + "imgLoader::RemoveFromCache removing from tracker"); + if (mCacheTracker) { + mCacheTracker->RemoveObject(entry); + } + // Only search the queue to remove the entry if its possible it might + // be in the queue. If we know its not in the queue this would be + // wasted work. + MOZ_ASSERT_IF(aQueueState == QueueState::AlreadyRemoved, + !mCacheQueue.Contains(entry)); + if (aQueueState == QueueState::MaybeExists) { + mCacheQueue.Remove(entry); + } + } + + entry->SetEvicted(true); + request->SetIsInCache(false); + AddToUncachedImages(request); + + return true; + } + + return false; +} + +nsresult imgLoader::ClearImageCache(ClearOptions aOptions) { + const bool chromeOnly = aOptions.contains(ClearOption::ChromeOnly); + const auto ShouldRemove = [&](imgCacheEntry* aEntry) { + if (chromeOnly) { + // TODO: Consider also removing "resource://" etc? + RefPtr<imgRequest> request = aEntry->GetRequest(); + if (!request || !request->CacheKey().URI()->SchemeIs("chrome")) { + return false; + } + } + return true; + }; + if (aOptions.contains(ClearOption::UnusedOnly)) { + LOG_STATIC_FUNC(gImgLog, "imgLoader::ClearImageCache queue"); + // We have to make a temporary, since RemoveFromCache removes the element + // from the queue, invalidating iterators. + nsTArray<RefPtr<imgCacheEntry>> entries(mCacheQueue.GetNumElements()); + for (auto& entry : mCacheQueue) { + if (ShouldRemove(entry)) { + entries.AppendElement(entry); + } + } + + // Iterate in reverse order to minimize array copying. + for (auto& entry : entries) { + if (!RemoveFromCache(entry)) { + return NS_ERROR_FAILURE; + } + } + + MOZ_ASSERT(chromeOnly || mCacheQueue.GetNumElements() == 0); + return NS_OK; + } + + LOG_STATIC_FUNC(gImgLog, "imgLoader::ClearImageCache table"); + // We have to make a temporary, since RemoveFromCache removes the element + // from the queue, invalidating iterators. + const auto entries = + ToTArray<nsTArray<RefPtr<imgCacheEntry>>>(mCache.Values()); + for (const auto& entry : entries) { + if (!ShouldRemove(entry)) { + continue; + } + if (!RemoveFromCache(entry)) { + return NS_ERROR_FAILURE; + } + } + MOZ_ASSERT(chromeOnly || mCache.IsEmpty()); + return NS_OK; +} + +void imgLoader::AddToUncachedImages(imgRequest* aRequest) { + MutexAutoLock lock(mUncachedImagesMutex); + mUncachedImages.Insert(aRequest); +} + +void imgLoader::RemoveFromUncachedImages(imgRequest* aRequest) { + MutexAutoLock lock(mUncachedImagesMutex); + mUncachedImages.Remove(aRequest); +} + +#define LOAD_FLAGS_CACHE_MASK \ + (nsIRequest::LOAD_BYPASS_CACHE | nsIRequest::LOAD_FROM_CACHE) + +#define LOAD_FLAGS_VALIDATE_MASK \ + (nsIRequest::VALIDATE_ALWAYS | nsIRequest::VALIDATE_NEVER | \ + nsIRequest::VALIDATE_ONCE_PER_SESSION) + +NS_IMETHODIMP +imgLoader::LoadImageXPCOM( + nsIURI* aURI, nsIURI* aInitialDocumentURI, nsIReferrerInfo* aReferrerInfo, + nsIPrincipal* aTriggeringPrincipal, nsILoadGroup* aLoadGroup, + imgINotificationObserver* aObserver, Document* aLoadingDocument, + nsLoadFlags aLoadFlags, nsISupports* aCacheKey, + nsContentPolicyType aContentPolicyType, imgIRequest** _retval) { + // Optional parameter, so defaults to 0 (== TYPE_INVALID) + if (!aContentPolicyType) { + aContentPolicyType = nsIContentPolicy::TYPE_INTERNAL_IMAGE; + } + imgRequestProxy* proxy; + nsresult rv = + LoadImage(aURI, aInitialDocumentURI, aReferrerInfo, aTriggeringPrincipal, + 0, aLoadGroup, aObserver, aLoadingDocument, aLoadingDocument, + aLoadFlags, aCacheKey, aContentPolicyType, u""_ns, + /* aUseUrgentStartForChannel */ false, /* aListPreload */ false, + 0, &proxy); + *_retval = proxy; + return rv; +} + +static void MakeRequestStaticIfNeeded( + Document* aLoadingDocument, imgRequestProxy** aProxyAboutToGetReturned) { + if (!aLoadingDocument || !aLoadingDocument->IsStaticDocument()) { + return; + } + + if (!*aProxyAboutToGetReturned) { + return; + } + + RefPtr<imgRequestProxy> proxy = dont_AddRef(*aProxyAboutToGetReturned); + *aProxyAboutToGetReturned = nullptr; + + RefPtr<imgRequestProxy> staticProxy = + proxy->GetStaticRequest(aLoadingDocument); + if (staticProxy != proxy) { + proxy->CancelAndForgetObserver(NS_BINDING_ABORTED); + proxy = std::move(staticProxy); + } + proxy.forget(aProxyAboutToGetReturned); +} + +bool imgLoader::IsImageAvailable(nsIURI* aURI, + nsIPrincipal* aTriggeringPrincipal, + CORSMode aCORSMode, Document* aDocument) { + ImageCacheKey key(aURI, aCORSMode, + aTriggeringPrincipal->OriginAttributesRef(), aDocument); + RefPtr<imgCacheEntry> entry; + if (!mCache.Get(key, getter_AddRefs(entry)) || !entry) { + return false; + } + RefPtr<imgRequest> request = entry->GetRequest(); + if (!request) { + return false; + } + if (nsCOMPtr<nsILoadGroup> docLoadGroup = aDocument->GetDocumentLoadGroup()) { + nsLoadFlags requestFlags = nsIRequest::LOAD_NORMAL; + docLoadGroup->GetLoadFlags(&requestFlags); + if (requestFlags & nsIRequest::LOAD_BYPASS_CACHE) { + // If we're bypassing the cache, treat the image as not available. + return false; + } + } + return ValidateCORSMode(request, false, aCORSMode, aTriggeringPrincipal); +} + +nsresult imgLoader::LoadImage( + nsIURI* aURI, nsIURI* aInitialDocumentURI, nsIReferrerInfo* aReferrerInfo, + nsIPrincipal* aTriggeringPrincipal, uint64_t aRequestContextID, + nsILoadGroup* aLoadGroup, imgINotificationObserver* aObserver, + nsINode* aContext, Document* aLoadingDocument, nsLoadFlags aLoadFlags, + nsISupports* aCacheKey, nsContentPolicyType aContentPolicyType, + const nsAString& initiatorType, bool aUseUrgentStartForChannel, + bool aLinkPreload, uint64_t aEarlyHintPreloaderId, + imgRequestProxy** _retval) { + VerifyCacheSizes(); + + NS_ASSERTION(aURI, "imgLoader::LoadImage -- NULL URI pointer"); + + if (!aURI) { + return NS_ERROR_NULL_POINTER; + } + + auto makeStaticIfNeeded = mozilla::MakeScopeExit( + [&] { MakeRequestStaticIfNeeded(aLoadingDocument, _retval); }); + + AUTO_PROFILER_LABEL_DYNAMIC_NSCSTRING("imgLoader::LoadImage", NETWORK, + aURI->GetSpecOrDefault()); + + LOG_SCOPE_WITH_PARAM(gImgLog, "imgLoader::LoadImage", "aURI", aURI); + + *_retval = nullptr; + + RefPtr<imgRequest> request; + + nsresult rv; + nsLoadFlags requestFlags = nsIRequest::LOAD_NORMAL; + +#ifdef DEBUG + bool isPrivate = false; + + if (aLoadingDocument) { + isPrivate = nsContentUtils::IsInPrivateBrowsing(aLoadingDocument); + } else if (aLoadGroup) { + isPrivate = nsContentUtils::IsInPrivateBrowsing(aLoadGroup); + } + MOZ_ASSERT(isPrivate == mRespectPrivacy); + + if (aLoadingDocument) { + // The given load group should match that of the document if given. If + // that isn't the case, then we need to add more plumbing to ensure we + // block the document as well. + nsCOMPtr<nsILoadGroup> docLoadGroup = + aLoadingDocument->GetDocumentLoadGroup(); + MOZ_ASSERT(docLoadGroup == aLoadGroup); + } +#endif + + // Get the default load flags from the loadgroup (if possible)... + if (aLoadGroup) { + aLoadGroup->GetLoadFlags(&requestFlags); + } + // + // Merge the default load flags with those passed in via aLoadFlags. + // Currently, *only* the caching, validation and background load flags + // are merged... + // + // The flags in aLoadFlags take precedence over the default flags! + // + if (aLoadFlags & LOAD_FLAGS_CACHE_MASK) { + // Override the default caching flags... + requestFlags = (requestFlags & ~LOAD_FLAGS_CACHE_MASK) | + (aLoadFlags & LOAD_FLAGS_CACHE_MASK); + } + if (aLoadFlags & LOAD_FLAGS_VALIDATE_MASK) { + // Override the default validation flags... + requestFlags = (requestFlags & ~LOAD_FLAGS_VALIDATE_MASK) | + (aLoadFlags & LOAD_FLAGS_VALIDATE_MASK); + } + if (aLoadFlags & nsIRequest::LOAD_BACKGROUND) { + // Propagate background loading... + requestFlags |= nsIRequest::LOAD_BACKGROUND; + } + if (aLoadFlags & nsIRequest::LOAD_RECORD_START_REQUEST_DELAY) { + requestFlags |= nsIRequest::LOAD_RECORD_START_REQUEST_DELAY; + } + + if (aLinkPreload) { + // Set background loading if it is <link rel=preload> + requestFlags |= nsIRequest::LOAD_BACKGROUND; + } + + CORSMode corsmode = CORS_NONE; + if (aLoadFlags & imgILoader::LOAD_CORS_ANONYMOUS) { + corsmode = CORS_ANONYMOUS; + } else if (aLoadFlags & imgILoader::LOAD_CORS_USE_CREDENTIALS) { + corsmode = CORS_USE_CREDENTIALS; + } + + // Look in the preloaded images of loading document first. + if (StaticPrefs::network_preload() && !aLinkPreload && aLoadingDocument) { + // All Early Hints preloads are Link preloads, therefore we don't have a + // Early Hints preload here + MOZ_ASSERT(!aEarlyHintPreloaderId); + auto key = + PreloadHashKey::CreateAsImage(aURI, aTriggeringPrincipal, corsmode); + if (RefPtr<PreloaderBase> preload = + aLoadingDocument->Preloads().LookupPreload(key)) { + RefPtr<imgRequestProxy> proxy = do_QueryObject(preload); + MOZ_ASSERT(proxy); + + MOZ_LOG(gImgLog, LogLevel::Debug, + ("[this=%p] imgLoader::LoadImage -- preloaded [proxy=%p]" + " [document=%p]\n", + this, proxy.get(), aLoadingDocument)); + + // Removing the preload for this image to be in parity with Chromium. Any + // following regular image request will be reloaded using the regular + // path: image cache, http cache, network. Any following `<link + // rel=preload as=image>` will start a new image preload that can be + // satisfied from http cache or network. + // + // There is a spec discussion for "preload cache", see + // https://github.com/w3c/preload/issues/97. And it is also not clear how + // preload image interacts with list of available images, see + // https://github.com/whatwg/html/issues/4474. + proxy->RemoveSelf(aLoadingDocument); + proxy->NotifyUsage(aLoadingDocument); + + imgRequest* request = proxy->GetOwner(); + nsresult rv = + CreateNewProxyForRequest(request, aURI, aLoadGroup, aLoadingDocument, + aObserver, requestFlags, _retval); + NS_ENSURE_SUCCESS(rv, rv); + + imgRequestProxy* newProxy = *_retval; + if (imgCacheValidator* validator = request->GetValidator()) { + newProxy->MarkValidating(); + // Attach the proxy without notifying and this will add us to the load + // group. + validator->AddProxy(newProxy); + } else { + // It's OK to add here even if the request is done. If it is, it'll send + // a OnStopRequest()and the proxy will be removed from the loadgroup in + // imgRequestProxy::OnLoadComplete. + newProxy->AddToLoadGroup(); + newProxy->NotifyListener(); + } + + return NS_OK; + } + } + + RefPtr<imgCacheEntry> entry; + + // Look in the cache for our URI, and then validate it. + // XXX For now ignore aCacheKey. We will need it in the future + // for correctly dealing with image load requests that are a result + // of post data. + OriginAttributes attrs; + if (aTriggeringPrincipal) { + attrs = aTriggeringPrincipal->OriginAttributesRef(); + } + ImageCacheKey key(aURI, corsmode, attrs, aLoadingDocument); + if (mCache.Get(key, getter_AddRefs(entry)) && entry) { + bool newChannelCreated = false; + if (ValidateEntry(entry, aURI, aInitialDocumentURI, aReferrerInfo, + aLoadGroup, aObserver, aLoadingDocument, requestFlags, + aContentPolicyType, true, &newChannelCreated, _retval, + aTriggeringPrincipal, corsmode, aLinkPreload, + aEarlyHintPreloaderId)) { + request = entry->GetRequest(); + + // If this entry has no proxies, its request has no reference to the + // entry. + if (entry->HasNoProxies()) { + LOG_FUNC_WITH_PARAM(gImgLog, + "imgLoader::LoadImage() adding proxyless entry", + "uri", key.URI()); + MOZ_ASSERT(!request->HasCacheEntry(), + "Proxyless entry's request has cache entry!"); + request->SetCacheEntry(entry); + + if (mCacheTracker && entry->GetExpirationState()->IsTracked()) { + mCacheTracker->MarkUsed(entry); + } + } + + entry->Touch(); + + if (!newChannelCreated) { + // This is ugly but it's needed to report CSP violations. We have 3 + // scenarios: + // - we don't have cache. We are not in this if() stmt. A new channel is + // created and that triggers the CSP checks. + // - We have a cache entry and this is blocked by CSP directives. + DebugOnly<bool> shouldLoad = ShouldLoadCachedImage( + request, aLoadingDocument, aTriggeringPrincipal, aContentPolicyType, + /* aSendCSPViolationReports */ true); + MOZ_ASSERT(shouldLoad); + } + } else { + // We can't use this entry. We'll try to load it off the network, and if + // successful, overwrite the old entry in the cache with a new one. + entry = nullptr; + } + } + + // Keep the channel in this scope, so we can adjust its notificationCallbacks + // later when we create the proxy. + nsCOMPtr<nsIChannel> newChannel; + // If we didn't get a cache hit, we need to load from the network. + if (!request) { + LOG_SCOPE(gImgLog, "imgLoader::LoadImage |cache miss|"); + + bool forcePrincipalCheck; + rv = NewImageChannel(getter_AddRefs(newChannel), &forcePrincipalCheck, aURI, + aInitialDocumentURI, corsmode, aReferrerInfo, + aLoadGroup, requestFlags, aContentPolicyType, + aTriggeringPrincipal, aContext, mRespectPrivacy, + aEarlyHintPreloaderId); + if (NS_FAILED(rv)) { + return NS_ERROR_FAILURE; + } + + MOZ_ASSERT(NS_UsePrivateBrowsing(newChannel) == mRespectPrivacy); + + NewRequestAndEntry(forcePrincipalCheck, this, key, getter_AddRefs(request), + getter_AddRefs(entry)); + + MOZ_LOG(gImgLog, LogLevel::Debug, + ("[this=%p] imgLoader::LoadImage -- Created new imgRequest" + " [request=%p]\n", + this, request.get())); + + nsCOMPtr<nsIClassOfService> cos(do_QueryInterface(newChannel)); + if (cos) { + if (aUseUrgentStartForChannel && !aLinkPreload) { + cos->AddClassFlags(nsIClassOfService::UrgentStart); + } + + if (StaticPrefs::network_http_tailing_enabled() && + aContentPolicyType == nsIContentPolicy::TYPE_INTERNAL_IMAGE_FAVICON) { + cos->AddClassFlags(nsIClassOfService::Throttleable | + nsIClassOfService::Tail); + nsCOMPtr<nsIHttpChannel> httpChannel(do_QueryInterface(newChannel)); + if (httpChannel) { + Unused << httpChannel->SetRequestContextID(aRequestContextID); + } + } + } + + nsCOMPtr<nsILoadGroup> channelLoadGroup; + newChannel->GetLoadGroup(getter_AddRefs(channelLoadGroup)); + rv = request->Init(aURI, aURI, /* aHadInsecureRedirect = */ false, + channelLoadGroup, newChannel, entry, aLoadingDocument, + aTriggeringPrincipal, corsmode, aReferrerInfo); + if (NS_FAILED(rv)) { + return NS_ERROR_FAILURE; + } + + // Add the initiator type for this image load + nsCOMPtr<nsITimedChannel> timedChannel = do_QueryInterface(newChannel); + if (timedChannel) { + timedChannel->SetInitiatorType(initiatorType); + } + + // create the proxy listener + nsCOMPtr<nsIStreamListener> listener = new ProxyListener(request.get()); + + MOZ_LOG(gImgLog, LogLevel::Debug, + ("[this=%p] imgLoader::LoadImage -- Calling channel->AsyncOpen()\n", + this)); + + mozilla::net::PredictorLearn(aURI, aInitialDocumentURI, + nsINetworkPredictor::LEARN_LOAD_SUBRESOURCE, + aLoadGroup); + + nsresult openRes; + openRes = newChannel->AsyncOpen(listener); + + if (NS_FAILED(openRes)) { + MOZ_LOG( + gImgLog, LogLevel::Debug, + ("[this=%p] imgLoader::LoadImage -- AsyncOpen() failed: 0x%" PRIx32 + "\n", + this, static_cast<uint32_t>(openRes))); + request->CancelAndAbort(openRes); + return openRes; + } + + // Try to add the new request into the cache. + PutIntoCache(key, entry); + } else { + LOG_MSG_WITH_PARAM(gImgLog, "imgLoader::LoadImage |cache hit|", "request", + request); + } + + // If we didn't get a proxy when validating the cache entry, we need to + // create one. + if (!*_retval) { + // ValidateEntry() has three return values: "Is valid," "might be valid -- + // validating over network", and "not valid." If we don't have a _retval, + // we know ValidateEntry is not validating over the network, so it's safe + // to SetLoadId here because we know this request is valid for this context. + // + // Note, however, that this doesn't guarantee the behaviour we want (one + // URL maps to the same image on a page) if we load the same image in a + // different tab (see bug 528003), because its load id will get re-set, and + // that'll cause us to validate over the network. + request->SetLoadId(aLoadingDocument); + + LOG_MSG(gImgLog, "imgLoader::LoadImage", "creating proxy request."); + rv = CreateNewProxyForRequest(request, aURI, aLoadGroup, aLoadingDocument, + aObserver, requestFlags, _retval); + if (NS_FAILED(rv)) { + return rv; + } + + imgRequestProxy* proxy = *_retval; + + // Make sure that OnStatus/OnProgress calls have the right request set, if + // we did create a channel here. + if (newChannel) { + nsCOMPtr<nsIInterfaceRequestor> requestor( + new nsProgressNotificationProxy(newChannel, proxy)); + if (!requestor) { + return NS_ERROR_OUT_OF_MEMORY; + } + newChannel->SetNotificationCallbacks(requestor); + } + + if (aLinkPreload) { + MOZ_ASSERT(aLoadingDocument); + proxy->PrioritizeAsPreload(); + auto preloadKey = + PreloadHashKey::CreateAsImage(aURI, aTriggeringPrincipal, corsmode); + proxy->NotifyOpen(preloadKey, aLoadingDocument, true); + } + + // Note that it's OK to add here even if the request is done. If it is, + // it'll send a OnStopRequest() to the proxy in imgRequestProxy::Notify and + // the proxy will be removed from the loadgroup. + proxy->AddToLoadGroup(); + + // If we're loading off the network, explicitly don't notify our proxy, + // because necko (or things called from necko, such as imgCacheValidator) + // are going to call our notifications asynchronously, and we can't make it + // further asynchronous because observers might rely on imagelib completing + // its work between the channel's OnStartRequest and OnStopRequest. + if (!newChannel) { + proxy->NotifyListener(); + } + + return rv; + } + + NS_ASSERTION(*_retval, "imgLoader::LoadImage -- no return value"); + + return NS_OK; +} + +NS_IMETHODIMP +imgLoader::LoadImageWithChannelXPCOM(nsIChannel* channel, + imgINotificationObserver* aObserver, + Document* aLoadingDocument, + nsIStreamListener** listener, + imgIRequest** _retval) { + nsresult result; + imgRequestProxy* proxy; + result = LoadImageWithChannel(channel, aObserver, aLoadingDocument, listener, + &proxy); + *_retval = proxy; + return result; +} + +nsresult imgLoader::LoadImageWithChannel(nsIChannel* channel, + imgINotificationObserver* aObserver, + Document* aLoadingDocument, + nsIStreamListener** listener, + imgRequestProxy** _retval) { + NS_ASSERTION(channel, + "imgLoader::LoadImageWithChannel -- NULL channel pointer"); + + MOZ_ASSERT(NS_UsePrivateBrowsing(channel) == mRespectPrivacy); + + auto makeStaticIfNeeded = mozilla::MakeScopeExit( + [&] { MakeRequestStaticIfNeeded(aLoadingDocument, _retval); }); + + LOG_SCOPE(gImgLog, "imgLoader::LoadImageWithChannel"); + RefPtr<imgRequest> request; + + nsCOMPtr<nsIURI> uri; + channel->GetURI(getter_AddRefs(uri)); + + NS_ENSURE_TRUE(channel, NS_ERROR_FAILURE); + nsCOMPtr<nsILoadInfo> loadInfo = channel->LoadInfo(); + + OriginAttributes attrs = loadInfo->GetOriginAttributes(); + + // TODO: Get a meaningful cors mode from the caller probably? + const auto corsMode = CORS_NONE; + ImageCacheKey key(uri, corsMode, attrs, aLoadingDocument); + + nsLoadFlags requestFlags = nsIRequest::LOAD_NORMAL; + channel->GetLoadFlags(&requestFlags); + + RefPtr<imgCacheEntry> entry; + + if (requestFlags & nsIRequest::LOAD_BYPASS_CACHE) { + RemoveFromCache(key); + } else { + // Look in the cache for our URI, and then validate it. + // XXX For now ignore aCacheKey. We will need it in the future + // for correctly dealing with image load requests that are a result + // of post data. + if (mCache.Get(key, getter_AddRefs(entry)) && entry) { + // We don't want to kick off another network load. So we ask + // ValidateEntry to only do validation without creating a new proxy. If + // it says that the entry isn't valid any more, we'll only use the entry + // we're getting if the channel is loading from the cache anyways. + // + // XXX -- should this be changed? it's pretty much verbatim from the old + // code, but seems nonsensical. + // + // Since aCanMakeNewChannel == false, we don't need to pass content policy + // type/principal/etc + + nsCOMPtr<nsILoadInfo> loadInfo = channel->LoadInfo(); + // if there is a loadInfo, use the right contentType, otherwise + // default to the internal image type + nsContentPolicyType policyType = loadInfo->InternalContentPolicyType(); + + if (ValidateEntry(entry, uri, nullptr, nullptr, nullptr, aObserver, + aLoadingDocument, requestFlags, policyType, false, + nullptr, nullptr, nullptr, corsMode, false, 0)) { + request = entry->GetRequest(); + } else { + nsCOMPtr<nsICacheInfoChannel> cacheChan(do_QueryInterface(channel)); + bool bUseCacheCopy; + + if (cacheChan) { + cacheChan->IsFromCache(&bUseCacheCopy); + } else { + bUseCacheCopy = false; + } + + if (!bUseCacheCopy) { + entry = nullptr; + } else { + request = entry->GetRequest(); + } + } + + if (request && entry) { + // If this entry has no proxies, its request has no reference to + // the entry. + if (entry->HasNoProxies()) { + LOG_FUNC_WITH_PARAM( + gImgLog, + "imgLoader::LoadImageWithChannel() adding proxyless entry", "uri", + key.URI()); + MOZ_ASSERT(!request->HasCacheEntry(), + "Proxyless entry's request has cache entry!"); + request->SetCacheEntry(entry); + + if (mCacheTracker && entry->GetExpirationState()->IsTracked()) { + mCacheTracker->MarkUsed(entry); + } + } + } + } + } + + nsCOMPtr<nsILoadGroup> loadGroup; + channel->GetLoadGroup(getter_AddRefs(loadGroup)); + +#ifdef DEBUG + if (aLoadingDocument) { + // The load group of the channel should always match that of the + // document if given. If that isn't the case, then we need to add more + // plumbing to ensure we block the document as well. + nsCOMPtr<nsILoadGroup> docLoadGroup = + aLoadingDocument->GetDocumentLoadGroup(); + MOZ_ASSERT(docLoadGroup == loadGroup); + } +#endif + + // Filter out any load flags not from nsIRequest + requestFlags &= nsIRequest::LOAD_REQUESTMASK; + + nsresult rv = NS_OK; + if (request) { + // we have this in our cache already.. cancel the current (document) load + + // this should fire an OnStopRequest + channel->Cancel(NS_ERROR_PARSED_DATA_CACHED); + + *listener = nullptr; // give them back a null nsIStreamListener + + rv = CreateNewProxyForRequest(request, uri, loadGroup, aLoadingDocument, + aObserver, requestFlags, _retval); + static_cast<imgRequestProxy*>(*_retval)->NotifyListener(); + } else { + // We use originalURI here to fulfil the imgIRequest contract on GetURI. + nsCOMPtr<nsIURI> originalURI; + channel->GetOriginalURI(getter_AddRefs(originalURI)); + + // XXX(seth): We should be able to just use |key| here, except that |key| is + // constructed above with the *current URI* and not the *original URI*. I'm + // pretty sure this is a bug, and it's preventing us from ever getting a + // cache hit in LoadImageWithChannel when redirects are involved. + ImageCacheKey originalURIKey(originalURI, corsMode, attrs, + aLoadingDocument); + + // Default to doing a principal check because we don't know who + // started that load and whether their principal ended up being + // inherited on the channel. + NewRequestAndEntry(/* aForcePrincipalCheckForCacheEntry = */ true, this, + originalURIKey, getter_AddRefs(request), + getter_AddRefs(entry)); + + // No principal specified here, because we're not passed one. + // In LoadImageWithChannel, the redirects that may have been + // associated with this load would have gone through necko. + // We only have the final URI in ImageLib and hence don't know + // if the request went through insecure redirects. But if it did, + // the necko cache should have handled that (since all necko cache hits + // including the redirects will go through content policy). Hence, we + // can set aHadInsecureRedirect to false here. + rv = request->Init(originalURI, uri, /* aHadInsecureRedirect = */ false, + channel, channel, entry, aLoadingDocument, nullptr, + corsMode, nullptr); + NS_ENSURE_SUCCESS(rv, rv); + + RefPtr<ProxyListener> pl = + new ProxyListener(static_cast<nsIStreamListener*>(request.get())); + pl.forget(listener); + + // Try to add the new request into the cache. + PutIntoCache(originalURIKey, entry); + + rv = CreateNewProxyForRequest(request, originalURI, loadGroup, + aLoadingDocument, aObserver, requestFlags, + _retval); + + // Explicitly don't notify our proxy, because we're loading off the + // network, and necko (or things called from necko, such as + // imgCacheValidator) are going to call our notifications asynchronously, + // and we can't make it further asynchronous because observers might rely + // on imagelib completing its work between the channel's OnStartRequest and + // OnStopRequest. + } + + if (NS_FAILED(rv)) { + return rv; + } + + (*_retval)->AddToLoadGroup(); + return rv; +} + +bool imgLoader::SupportImageWithMimeType(const nsACString& aMimeType, + AcceptedMimeTypes aAccept + /* = AcceptedMimeTypes::IMAGES */) { + nsAutoCString mimeType(aMimeType); + ToLowerCase(mimeType); + + if (aAccept == AcceptedMimeTypes::IMAGES_AND_DOCUMENTS && + mimeType.EqualsLiteral("image/svg+xml")) { + return true; + } + + DecoderType type = DecoderFactory::GetDecoderType(mimeType.get()); + return type != DecoderType::UNKNOWN; +} + +NS_IMETHODIMP +imgLoader::GetMIMETypeFromContent(nsIRequest* aRequest, + const uint8_t* aContents, uint32_t aLength, + nsACString& aContentType) { + nsCOMPtr<nsIChannel> channel(do_QueryInterface(aRequest)); + if (channel) { + nsCOMPtr<nsILoadInfo> loadInfo = channel->LoadInfo(); + if (loadInfo->GetSkipContentSniffing()) { + return NS_ERROR_NOT_AVAILABLE; + } + } + + nsresult rv = + GetMimeTypeFromContent((const char*)aContents, aLength, aContentType); + if (NS_SUCCEEDED(rv) && channel && XRE_IsParentProcess()) { + if (RefPtr<mozilla::net::nsHttpChannel> httpChannel = + do_QueryObject(channel)) { + // If the image type pattern matching algorithm given bytes does not + // return undefined, then disable the further check and allow the + // response. + httpChannel->DisableIsOpaqueResponseAllowedAfterSniffCheck( + mozilla::net::nsHttpChannel::SnifferType::Image); + } + } + + return rv; +} + +/* static */ +nsresult imgLoader::GetMimeTypeFromContent(const char* aContents, + uint32_t aLength, + nsACString& aContentType) { + nsAutoCString detected; + + /* Is it a GIF? */ + if (aLength >= 6 && + (!strncmp(aContents, "GIF87a", 6) || !strncmp(aContents, "GIF89a", 6))) { + aContentType.AssignLiteral(IMAGE_GIF); + + /* or a PNG? */ + } else if (aLength >= 8 && ((unsigned char)aContents[0] == 0x89 && + (unsigned char)aContents[1] == 0x50 && + (unsigned char)aContents[2] == 0x4E && + (unsigned char)aContents[3] == 0x47 && + (unsigned char)aContents[4] == 0x0D && + (unsigned char)aContents[5] == 0x0A && + (unsigned char)aContents[6] == 0x1A && + (unsigned char)aContents[7] == 0x0A)) { + aContentType.AssignLiteral(IMAGE_PNG); + + /* maybe a JPEG (JFIF)? */ + /* JFIF files start with SOI APP0 but older files can start with SOI DQT + * so we test for SOI followed by any marker, i.e. FF D8 FF + * this will also work for SPIFF JPEG files if they appear in the future. + * + * (JFIF is 0XFF 0XD8 0XFF 0XE0 <skip 2> 0X4A 0X46 0X49 0X46 0X00) + */ + } else if (aLength >= 3 && ((unsigned char)aContents[0]) == 0xFF && + ((unsigned char)aContents[1]) == 0xD8 && + ((unsigned char)aContents[2]) == 0xFF) { + aContentType.AssignLiteral(IMAGE_JPEG); + + /* or how about ART? */ + /* ART begins with JG (4A 47). Major version offset 2. + * Minor version offset 3. Offset 4 must be nullptr. + */ + } else if (aLength >= 5 && ((unsigned char)aContents[0]) == 0x4a && + ((unsigned char)aContents[1]) == 0x47 && + ((unsigned char)aContents[4]) == 0x00) { + aContentType.AssignLiteral(IMAGE_ART); + + } else if (aLength >= 2 && !strncmp(aContents, "BM", 2)) { + aContentType.AssignLiteral(IMAGE_BMP); + + // ICOs always begin with a 2-byte 0 followed by a 2-byte 1. + // CURs begin with 2-byte 0 followed by 2-byte 2. + } else if (aLength >= 4 && (!memcmp(aContents, "\000\000\001\000", 4) || + !memcmp(aContents, "\000\000\002\000", 4))) { + aContentType.AssignLiteral(IMAGE_ICO); + + // WebPs always begin with RIFF, a 32-bit length, and WEBP. + } else if (aLength >= 12 && !memcmp(aContents, "RIFF", 4) && + !memcmp(aContents + 8, "WEBP", 4)) { + aContentType.AssignLiteral(IMAGE_WEBP); + + } else if (MatchesMP4(reinterpret_cast<const uint8_t*>(aContents), aLength, + detected) && + detected.Equals(IMAGE_AVIF)) { + aContentType.AssignLiteral(IMAGE_AVIF); + } else if ((aLength >= 2 && !memcmp(aContents, "\xFF\x0A", 2)) || + (aLength >= 12 && + !memcmp(aContents, "\x00\x00\x00\x0CJXL \x0D\x0A\x87\x0A", 12))) { + // Each version is for containerless and containerful files respectively. + aContentType.AssignLiteral(IMAGE_JXL); + } else { + /* none of the above? I give up */ + return NS_ERROR_NOT_AVAILABLE; + } + + return NS_OK; +} + +/** + * proxy stream listener class used to handle multipart/x-mixed-replace + */ + +#include "nsIRequest.h" +#include "nsIStreamConverterService.h" + +NS_IMPL_ISUPPORTS(ProxyListener, nsIStreamListener, + nsIThreadRetargetableStreamListener, nsIRequestObserver) + +ProxyListener::ProxyListener(nsIStreamListener* dest) : mDestListener(dest) {} + +ProxyListener::~ProxyListener() = default; + +/** nsIRequestObserver methods **/ + +NS_IMETHODIMP +ProxyListener::OnStartRequest(nsIRequest* aRequest) { + if (!mDestListener) { + return NS_ERROR_FAILURE; + } + + nsCOMPtr<nsIChannel> channel(do_QueryInterface(aRequest)); + if (channel) { + // We need to set the initiator type for the image load + nsCOMPtr<nsITimedChannel> timedChannel = do_QueryInterface(channel); + if (timedChannel) { + nsAutoString type; + timedChannel->GetInitiatorType(type); + if (type.IsEmpty()) { + timedChannel->SetInitiatorType(u"img"_ns); + } + } + + nsAutoCString contentType; + nsresult rv = channel->GetContentType(contentType); + + if (!contentType.IsEmpty()) { + /* If multipart/x-mixed-replace content, we'll insert a MIME decoder + in the pipeline to handle the content and pass it along to our + original listener. + */ + if ("multipart/x-mixed-replace"_ns.Equals(contentType)) { + nsCOMPtr<nsIStreamConverterService> convServ( + do_GetService("@mozilla.org/streamConverters;1", &rv)); + if (NS_SUCCEEDED(rv)) { + nsCOMPtr<nsIStreamListener> toListener(mDestListener); + nsCOMPtr<nsIStreamListener> fromListener; + + rv = convServ->AsyncConvertData("multipart/x-mixed-replace", "*/*", + toListener, nullptr, + getter_AddRefs(fromListener)); + if (NS_SUCCEEDED(rv)) { + mDestListener = fromListener; + } + } + } + } + } + + return mDestListener->OnStartRequest(aRequest); +} + +NS_IMETHODIMP +ProxyListener::OnStopRequest(nsIRequest* aRequest, nsresult status) { + if (!mDestListener) { + return NS_ERROR_FAILURE; + } + + return mDestListener->OnStopRequest(aRequest, status); +} + +/** nsIStreamListener methods **/ + +NS_IMETHODIMP +ProxyListener::OnDataAvailable(nsIRequest* aRequest, nsIInputStream* inStr, + uint64_t sourceOffset, uint32_t count) { + if (!mDestListener) { + return NS_ERROR_FAILURE; + } + + return mDestListener->OnDataAvailable(aRequest, inStr, sourceOffset, count); +} + +/** nsThreadRetargetableStreamListener methods **/ +NS_IMETHODIMP +ProxyListener::CheckListenerChain() { + NS_ASSERTION(NS_IsMainThread(), "Should be on the main thread!"); + nsresult rv = NS_OK; + nsCOMPtr<nsIThreadRetargetableStreamListener> retargetableListener = + do_QueryInterface(mDestListener, &rv); + if (retargetableListener) { + rv = retargetableListener->CheckListenerChain(); + } + MOZ_LOG( + gImgLog, LogLevel::Debug, + ("ProxyListener::CheckListenerChain %s [this=%p listener=%p rv=%" PRIx32 + "]", + (NS_SUCCEEDED(rv) ? "success" : "failure"), this, + (nsIStreamListener*)mDestListener, static_cast<uint32_t>(rv))); + return rv; +} + +/** + * http validate class. check a channel for a 304 + */ + +NS_IMPL_ISUPPORTS(imgCacheValidator, nsIStreamListener, nsIRequestObserver, + nsIThreadRetargetableStreamListener, nsIChannelEventSink, + nsIInterfaceRequestor, nsIAsyncVerifyRedirectCallback) + +imgCacheValidator::imgCacheValidator(nsProgressNotificationProxy* progress, + imgLoader* loader, imgRequest* request, + Document* aDocument, + uint64_t aInnerWindowId, + bool forcePrincipalCheckForCacheEntry) + : mProgressProxy(progress), + mRequest(request), + mDocument(aDocument), + mInnerWindowId(aInnerWindowId), + mImgLoader(loader), + mHadInsecureRedirect(false) { + NewRequestAndEntry(forcePrincipalCheckForCacheEntry, loader, + mRequest->CacheKey(), getter_AddRefs(mNewRequest), + getter_AddRefs(mNewEntry)); +} + +imgCacheValidator::~imgCacheValidator() { + if (mRequest) { + // If something went wrong, and we never unblocked the requests waiting on + // validation, now is our last chance. We will cancel the new request and + // switch the waiting proxies to it. + UpdateProxies(/* aCancelRequest */ true, /* aSyncNotify */ false); + } +} + +void imgCacheValidator::AddProxy(imgRequestProxy* aProxy) { + // aProxy needs to be in the loadgroup since we're validating from + // the network. + aProxy->AddToLoadGroup(); + + mProxies.AppendElement(aProxy); +} + +void imgCacheValidator::RemoveProxy(imgRequestProxy* aProxy) { + mProxies.RemoveElement(aProxy); +} + +void imgCacheValidator::UpdateProxies(bool aCancelRequest, bool aSyncNotify) { + MOZ_ASSERT(mRequest); + + // Clear the validator before updating the proxies. The notifications may + // clone an existing request, and its state could be inconsistent. + mRequest->SetValidator(nullptr); + mRequest = nullptr; + + // If an error occurred, we will want to cancel the new request, and make the + // validating proxies point to it. Any proxies still bound to the original + // request which are not validating should remain untouched. + if (aCancelRequest) { + MOZ_ASSERT(mNewRequest); + mNewRequest->CancelAndAbort(NS_BINDING_ABORTED); + } + + // We have finished validating the request, so we can safely take ownership + // of the proxy list. imgRequestProxy::SyncNotifyListener can mutate the list + // if imgRequestProxy::CancelAndForgetObserver is called by its owner. Note + // that any potential notifications should still be suppressed in + // imgRequestProxy::ChangeOwner because we haven't cleared the validating + // flag yet, and thus they will remain deferred. + AutoTArray<RefPtr<imgRequestProxy>, 4> proxies(std::move(mProxies)); + + for (auto& proxy : proxies) { + // First update the state of all proxies before notifying any of them + // to ensure a consistent state (e.g. in case the notification causes + // other proxies to be touched indirectly.) + MOZ_ASSERT(proxy->IsValidating()); + MOZ_ASSERT(proxy->NotificationsDeferred(), + "Proxies waiting on cache validation should be " + "deferring notifications!"); + if (mNewRequest) { + proxy->ChangeOwner(mNewRequest); + } + proxy->ClearValidating(); + } + + mNewRequest = nullptr; + mNewEntry = nullptr; + + for (auto& proxy : proxies) { + if (aSyncNotify) { + // Notify synchronously, because the caller knows we are already in an + // asynchronously-called function (e.g. OnStartRequest). + proxy->SyncNotifyListener(); + } else { + // Notify asynchronously, because the caller does not know our current + // call state (e.g. ~imgCacheValidator). + proxy->NotifyListener(); + } + } +} + +/** nsIRequestObserver methods **/ + +NS_IMETHODIMP +imgCacheValidator::OnStartRequest(nsIRequest* aRequest) { + // We may be holding on to a document, so ensure that it's released. + RefPtr<Document> document = mDocument.forget(); + + // If for some reason we don't still have an existing request (probably + // because OnStartRequest got delivered more than once), just bail. + if (!mRequest) { + MOZ_ASSERT_UNREACHABLE("OnStartRequest delivered more than once?"); + aRequest->CancelWithReason(NS_BINDING_ABORTED, + "OnStartRequest delivered more than once?"_ns); + return NS_ERROR_FAILURE; + } + + // If this request is coming from cache and has the same URI as our + // imgRequest, the request all our proxies are pointing at is valid, and all + // we have to do is tell them to notify their listeners. + nsCOMPtr<nsICacheInfoChannel> cacheChan(do_QueryInterface(aRequest)); + nsCOMPtr<nsIChannel> channel(do_QueryInterface(aRequest)); + if (cacheChan && channel) { + bool isFromCache = false; + cacheChan->IsFromCache(&isFromCache); + + nsCOMPtr<nsIURI> channelURI; + channel->GetURI(getter_AddRefs(channelURI)); + + nsCOMPtr<nsIURI> finalURI; + mRequest->GetFinalURI(getter_AddRefs(finalURI)); + + bool sameURI = false; + if (channelURI && finalURI) { + channelURI->Equals(finalURI, &sameURI); + } + + if (isFromCache && sameURI) { + // We don't need to load this any more. + aRequest->CancelWithReason(NS_BINDING_ABORTED, + "imgCacheValidator::OnStartRequest"_ns); + mNewRequest = nullptr; + + // Clear the validator before updating the proxies. The notifications may + // clone an existing request, and its state could be inconsistent. + mRequest->SetLoadId(document); + mRequest->SetInnerWindowID(mInnerWindowId); + UpdateProxies(/* aCancelRequest */ false, /* aSyncNotify */ true); + return NS_OK; + } + } + + // We can't load out of cache. We have to create a whole new request for the + // data that's coming in off the channel. + nsCOMPtr<nsIURI> uri; + mRequest->GetURI(getter_AddRefs(uri)); + + LOG_MSG_WITH_PARAM(gImgLog, + "imgCacheValidator::OnStartRequest creating new request", + "uri", uri); + + CORSMode corsmode = mRequest->GetCORSMode(); + nsCOMPtr<nsIReferrerInfo> referrerInfo = mRequest->GetReferrerInfo(); + nsCOMPtr<nsIPrincipal> triggeringPrincipal = + mRequest->GetTriggeringPrincipal(); + + // Doom the old request's cache entry + mRequest->RemoveFromCache(); + + // We use originalURI here to fulfil the imgIRequest contract on GetURI. + nsCOMPtr<nsIURI> originalURI; + channel->GetOriginalURI(getter_AddRefs(originalURI)); + nsresult rv = mNewRequest->Init(originalURI, uri, mHadInsecureRedirect, + aRequest, channel, mNewEntry, document, + triggeringPrincipal, corsmode, referrerInfo); + if (NS_FAILED(rv)) { + UpdateProxies(/* aCancelRequest */ true, /* aSyncNotify */ true); + return rv; + } + + mDestListener = new ProxyListener(mNewRequest); + + // Try to add the new request into the cache. Note that the entry must be in + // the cache before the proxies' ownership changes, because adding a proxy + // changes the caching behaviour for imgRequests. + mImgLoader->PutIntoCache(mNewRequest->CacheKey(), mNewEntry); + UpdateProxies(/* aCancelRequest */ false, /* aSyncNotify */ true); + return mDestListener->OnStartRequest(aRequest); +} + +NS_IMETHODIMP +imgCacheValidator::OnStopRequest(nsIRequest* aRequest, nsresult status) { + // Be sure we've released the document that we may have been holding on to. + mDocument = nullptr; + + if (!mDestListener) { + return NS_OK; + } + + return mDestListener->OnStopRequest(aRequest, status); +} + +/** nsIStreamListener methods **/ + +NS_IMETHODIMP +imgCacheValidator::OnDataAvailable(nsIRequest* aRequest, nsIInputStream* inStr, + uint64_t sourceOffset, uint32_t count) { + if (!mDestListener) { + // XXX see bug 113959 + uint32_t _retval; + inStr->ReadSegments(NS_DiscardSegment, nullptr, count, &_retval); + return NS_OK; + } + + return mDestListener->OnDataAvailable(aRequest, inStr, sourceOffset, count); +} + +/** nsIThreadRetargetableStreamListener methods **/ + +NS_IMETHODIMP +imgCacheValidator::CheckListenerChain() { + NS_ASSERTION(NS_IsMainThread(), "Should be on the main thread!"); + nsresult rv = NS_OK; + nsCOMPtr<nsIThreadRetargetableStreamListener> retargetableListener = + do_QueryInterface(mDestListener, &rv); + if (retargetableListener) { + rv = retargetableListener->CheckListenerChain(); + } + MOZ_LOG( + gImgLog, LogLevel::Debug, + ("[this=%p] imgCacheValidator::CheckListenerChain -- rv %" PRId32 "=%s", + this, static_cast<uint32_t>(rv), + NS_SUCCEEDED(rv) ? "succeeded" : "failed")); + return rv; +} + +/** nsIInterfaceRequestor methods **/ + +NS_IMETHODIMP +imgCacheValidator::GetInterface(const nsIID& aIID, void** aResult) { + if (aIID.Equals(NS_GET_IID(nsIChannelEventSink))) { + return QueryInterface(aIID, aResult); + } + + return mProgressProxy->GetInterface(aIID, aResult); +} + +// These functions are materially the same as the same functions in imgRequest. +// We duplicate them because we're verifying whether cache loads are necessary, +// not unconditionally loading. + +/** nsIChannelEventSink methods **/ +NS_IMETHODIMP +imgCacheValidator::AsyncOnChannelRedirect( + nsIChannel* oldChannel, nsIChannel* newChannel, uint32_t flags, + nsIAsyncVerifyRedirectCallback* callback) { + // Note all cache information we get from the old channel. + mNewRequest->SetCacheValidation(mNewEntry, oldChannel); + + // If the previous URI is a non-HTTPS URI, record that fact for later use by + // security code, which needs to know whether there is an insecure load at any + // point in the redirect chain. + nsCOMPtr<nsIURI> oldURI; + bool schemeLocal = false; + if (NS_FAILED(oldChannel->GetURI(getter_AddRefs(oldURI))) || + NS_FAILED(NS_URIChainHasFlags( + oldURI, nsIProtocolHandler::URI_IS_LOCAL_RESOURCE, &schemeLocal)) || + (!oldURI->SchemeIs("https") && !oldURI->SchemeIs("chrome") && + !schemeLocal)) { + mHadInsecureRedirect = true; + } + + // Prepare for callback + mRedirectCallback = callback; + mRedirectChannel = newChannel; + + return mProgressProxy->AsyncOnChannelRedirect(oldChannel, newChannel, flags, + this); +} + +NS_IMETHODIMP +imgCacheValidator::OnRedirectVerifyCallback(nsresult aResult) { + // If we've already been told to abort, just do so. + if (NS_FAILED(aResult)) { + mRedirectCallback->OnRedirectVerifyCallback(aResult); + mRedirectCallback = nullptr; + mRedirectChannel = nullptr; + return NS_OK; + } + + // make sure we have a protocol that returns data rather than opens + // an external application, e.g. mailto: + nsCOMPtr<nsIURI> uri; + mRedirectChannel->GetURI(getter_AddRefs(uri)); + + nsresult result = NS_OK; + + if (nsContentUtils::IsExternalProtocol(uri)) { + result = NS_ERROR_ABORT; + } + + mRedirectCallback->OnRedirectVerifyCallback(result); + mRedirectCallback = nullptr; + mRedirectChannel = nullptr; + return NS_OK; +} |