/* -*- 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/. */ #include "mozilla/Attributes.h" #include "mozilla/ClearOnShutdown.h" #include "mozilla/Move.h" #include "mozilla/Preferences.h" #include "ImageLogging.h" #include "nsPrintfCString.h" #include "imgLoader.h" #include "imgRequestProxy.h" #include "nsCOMPtr.h" #include "nsContentPolicyUtils.h" #include "nsContentUtils.h" #include "nsCORSListenerProxy.h" #include "nsNetUtil.h" #include "nsNetCID.h" #include "nsIProtocolHandler.h" #include "nsMimeTypes.h" #include "nsStreamUtils.h" #include "nsIHttpChannel.h" #include "nsICachingChannel.h" #include "nsIInterfaceRequestor.h" #include "nsIInterfaceRequestorUtils.h" #include "nsIProgressEventSink.h" #include "nsIChannelEventSink.h" #include "nsIAsyncVerifyRedirectCallback.h" #include "nsIFileURL.h" #include "nsIFile.h" #include "nsCRT.h" #include "nsINetworkPredictor.h" #include "mozilla/dom/nsMixedContentBlocker.h" #include "nsIApplicationCache.h" #include "nsIApplicationCacheContainer.h" #include "nsIMemoryReporter.h" #include "DecoderFactory.h" #include "Image.h" #include "gfxPrefs.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 "nsILoadContext.h" #include "nsILoadGroupChild.h" using namespace mozilla; using namespace mozilla::image; using namespace mozilla::net; MOZ_DEFINE_MALLOC_SIZE_OF(ImagesMallocSizeOf) class imgMemoryReporter final : public nsIMemoryReporter { ~imgMemoryReporter() { } public: NS_DECL_ISUPPORTS NS_IMETHOD CollectReports(nsIHandleReportCallback* aHandleReport, nsISupports* aData, bool aAnonymize) override { nsresult rv; nsTArray chrome; nsTArray content; nsTArray uncached; for (uint32_t i = 0; i < mKnownLoaders.Length(); i++) { mKnownLoaders[i]->mChromeCache.EnumerateRead(DoRecordCounter, &chrome); mKnownLoaders[i]->mCache.EnumerateRead(DoRecordCounter, &content); MutexAutoLock lock(mKnownLoaders[i]->mUncachedImagesMutex); for (auto iter = mKnownLoaders[i]->mUncachedImages.Iter(); !iter.Done(); iter.Next()) { nsPtrHashKey* entry = iter.Get(); RefPtr req = entry->GetKey(); RecordCounterForRequest(req, &uncached, req->HasConsumers()); } } // Note that we only need to anonymize content image URIs. rv = ReportCounterArray(aHandleReport, aData, chrome, "images/chrome"); NS_ENSURE_SUCCESS(rv, rv); rv = ReportCounterArray(aHandleReport, aData, content, "images/content", aAnonymize); NS_ENSURE_SUCCESS(rv, rv); // Uncached images may be content or chrome, so anonymize them. rv = ReportCounterArray(aHandleReport, aData, uncached, "images/uncached", aAnonymize); NS_ENSURE_SUCCESS(rv, rv); return NS_OK; } static int64_t ImagesContentUsedUncompressedDistinguishedAmount() { size_t n = 0; for (uint32_t i = 0; i < imgLoader::sMemReporter->mKnownLoaders.Length(); i++) { imgLoader::sMemReporter->mKnownLoaders[i]-> mCache.EnumerateRead(DoRecordCounterUsedDecoded, &n); } return n; } void RegisterLoader(imgLoader* aLoader) { mKnownLoaders.AppendElement(aLoader); } void UnregisterLoader(imgLoader* aLoader) { mKnownLoaders.RemoveElement(aLoader); } private: nsTArray 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 { 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. nsresult ReportCounterArray(nsIHandleReportCallback* aHandleReport, nsISupports* aData, nsTArray& aCounterArray, const char* aPathPrefix, bool aAnonymize = false) { nsresult rv; 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("", 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()) { rv = ReportImage(aHandleReport, aData, aPathPrefix, counter); NS_ENSURE_SUCCESS(rv, rv); } else { nonNotableTotal += counter; } } // Report non-notable images in aggregate. rv = ReportTotal(aHandleReport, aData, /* aExplicit = */ true, aPathPrefix, "/", nonNotableTotal); NS_ENSURE_SUCCESS(rv, rv); // Report a summary in aggregate, outside of the explicit tree. rv = ReportTotal(aHandleReport, aData, /* aExplicit = */ false, aPathPrefix, "", summaryTotal); NS_ENSURE_SUCCESS(rv, rv); return NS_OK; } static nsresult ReportImage(nsIHandleReportCallback* aHandleReport, nsISupports* aData, const char* aPathPrefix, const ImageMemoryCounter& aCounter) { nsresult rv; nsAutoCString pathPrefix(NS_LITERAL_CSTRING("explicit/")); pathPrefix.Append(aPathPrefix); pathPrefix.Append(aCounter.Type() == imgIContainer::TYPE_RASTER ? "/raster/" : "/vector/"); pathPrefix.Append(aCounter.IsUsed() ? "used/" : "unused/"); pathPrefix.Append("image("); pathPrefix.AppendInt(aCounter.IntrinsicSize().width); pathPrefix.Append("x"); pathPrefix.AppendInt(aCounter.IntrinsicSize().height); pathPrefix.Append(", "); if (aCounter.URI().IsEmpty()) { pathPrefix.Append(""); } else { pathPrefix.Append(aCounter.URI()); } pathPrefix.Append(")/"); rv = ReportSurfaces(aHandleReport, aData, pathPrefix, aCounter); NS_ENSURE_SUCCESS(rv, rv); rv = ReportSourceValue(aHandleReport, aData, pathPrefix, aCounter.Values()); NS_ENSURE_SUCCESS(rv, rv); return NS_OK; } static nsresult ReportSurfaces(nsIHandleReportCallback* aHandleReport, nsISupports* aData, const nsACString& aPathPrefix, const ImageMemoryCounter& aCounter) { for (const SurfaceMemoryCounter& counter : aCounter.Surfaces()) { nsAutoCString surfacePathPrefix(aPathPrefix); surfacePathPrefix.Append(counter.IsLocked() ? "locked/" : "unlocked/"); surfacePathPrefix.Append("surface("); if (counter.SubframeSize() && *counter.SubframeSize() != counter.Key().Size()) { surfacePathPrefix.AppendInt(counter.SubframeSize()->width); surfacePathPrefix.Append("x"); surfacePathPrefix.AppendInt(counter.SubframeSize()->height); surfacePathPrefix.Append(" subframe of "); } surfacePathPrefix.AppendInt(counter.Key().Size().width); surfacePathPrefix.Append("x"); surfacePathPrefix.AppendInt(counter.Key().Size().height); if (counter.Type() == SurfaceMemoryCounterType::NORMAL) { surfacePathPrefix.Append("@"); surfacePathPrefix.AppendFloat(counter.Key().AnimationTime()); if (counter.Key().Flags() != DefaultSurfaceFlags()) { surfacePathPrefix.Append(", flags:"); surfacePathPrefix.AppendInt(uint32_t(counter.Key().Flags()), /* aRadix = */ 16); } } else if (counter.Type() == SurfaceMemoryCounterType::COMPOSITING) { surfacePathPrefix.Append(", compositing frame"); } else if (counter.Type() == SurfaceMemoryCounterType::COMPOSITING_PREV) { surfacePathPrefix.Append(", compositing prev frame"); } else { MOZ_ASSERT_UNREACHABLE("Unknown counter type"); } surfacePathPrefix.Append(")/"); nsresult rv = ReportValues(aHandleReport, aData, surfacePathPrefix, counter.Values()); NS_ENSURE_SUCCESS(rv, rv); } return NS_OK; } static nsresult ReportTotal(nsIHandleReportCallback* aHandleReport, nsISupports* aData, bool aExplicit, const char* aPathPrefix, const char* aPathInfix, const MemoryTotal& aTotal) { nsresult rv; nsAutoCString pathPrefix; if (aExplicit) { pathPrefix.Append("explicit/"); } pathPrefix.Append(aPathPrefix); nsAutoCString rasterUsedPrefix(pathPrefix); rasterUsedPrefix.Append("/raster/used/"); rasterUsedPrefix.Append(aPathInfix); rv = ReportValues(aHandleReport, aData, rasterUsedPrefix, aTotal.UsedRaster()); NS_ENSURE_SUCCESS(rv, rv); nsAutoCString rasterUnusedPrefix(pathPrefix); rasterUnusedPrefix.Append("/raster/unused/"); rasterUnusedPrefix.Append(aPathInfix); rv = ReportValues(aHandleReport, aData, rasterUnusedPrefix, aTotal.UnusedRaster()); NS_ENSURE_SUCCESS(rv, rv); nsAutoCString vectorUsedPrefix(pathPrefix); vectorUsedPrefix.Append("/vector/used/"); vectorUsedPrefix.Append(aPathInfix); rv = ReportValues(aHandleReport, aData, vectorUsedPrefix, aTotal.UsedVector()); NS_ENSURE_SUCCESS(rv, rv); nsAutoCString vectorUnusedPrefix(pathPrefix); vectorUnusedPrefix.Append("/vector/unused/"); vectorUnusedPrefix.Append(aPathInfix); rv = ReportValues(aHandleReport, aData, vectorUnusedPrefix, aTotal.UnusedVector()); NS_ENSURE_SUCCESS(rv, rv); return NS_OK; } static nsresult ReportValues(nsIHandleReportCallback* aHandleReport, nsISupports* aData, const nsACString& aPathPrefix, const MemoryCounter& aCounter) { nsresult rv; rv = ReportSourceValue(aHandleReport, aData, aPathPrefix, aCounter); NS_ENSURE_SUCCESS(rv, rv); rv = ReportValue(aHandleReport, aData, KIND_HEAP, aPathPrefix, "decoded-heap", "Decoded image data which is stored on the heap.", aCounter.DecodedHeap()); NS_ENSURE_SUCCESS(rv, rv); rv = ReportValue(aHandleReport, aData, KIND_NONHEAP, aPathPrefix, "decoded-nonheap", "Decoded image data which isn't stored on the heap.", aCounter.DecodedNonHeap()); NS_ENSURE_SUCCESS(rv, rv); return NS_OK; } static nsresult ReportSourceValue(nsIHandleReportCallback* aHandleReport, nsISupports* aData, const nsACString& aPathPrefix, const MemoryCounter& aCounter) { nsresult rv; rv = ReportValue(aHandleReport, aData, KIND_HEAP, aPathPrefix, "source", "Raster image source data and vector image documents.", aCounter.Source()); return rv; } static nsresult ReportValue(nsIHandleReportCallback* aHandleReport, nsISupports* aData, int32_t aKind, const nsACString& aPathPrefix, const char* aPathSuffix, const char* aDescription, size_t aValue) { if (aValue == 0) { return NS_OK; } nsAutoCString desc(aDescription); nsAutoCString path(aPathPrefix); path.Append(aPathSuffix); return aHandleReport->Callback(EmptyCString(), path, aKind, UNITS_BYTES, aValue, desc, aData); } static PLDHashOperator DoRecordCounter(const ImageCacheKey&, imgCacheEntry* aEntry, void* aUserArg) { RefPtr req = aEntry->GetRequest(); RecordCounterForRequest(req, static_cast*>(aUserArg), !aEntry->HasNoProxies()); return PL_DHASH_NEXT; } static void RecordCounterForRequest(imgRequest* aRequest, nsTArray* aArray, bool aIsUsed) { RefPtr image = aRequest->GetImage(); if (!image) { return; } ImageMemoryCounter counter(image, ImagesMallocSizeOf, aIsUsed); aArray->AppendElement(Move(counter)); } static PLDHashOperator DoRecordCounterUsedDecoded(const ImageCacheKey&, imgCacheEntry* aEntry, void* aUserArg) { if (aEntry->HasNoProxies()) { return PL_DHASH_NEXT; } RefPtr req = aEntry->GetRequest(); RefPtr image = req->GetImage(); if (!image) { return PL_DHASH_NEXT; } // 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. ImageMemoryCounter counter(image, moz_malloc_size_of, /* aIsUsed = */ true); auto n = static_cast(aUserArg); *n += counter.Values().DecodedHeap(); *n += counter.Values().DecodedNonHeap(); return PL_DHASH_NEXT; } }; NS_IMPL_ISUPPORTS(imgMemoryReporter, nsIMemoryReporter) NS_IMPL_ISUPPORTS(nsProgressNotificationProxy, nsIProgressEventSink, nsIChannelEventSink, nsIInterfaceRequestor) NS_IMETHODIMP nsProgressNotificationProxy::OnProgress(nsIRequest* request, nsISupports* ctxt, int64_t progress, int64_t progressMax) { nsCOMPtr loadGroup; request->GetLoadGroup(getter_AddRefs(loadGroup)); nsCOMPtr target; NS_QueryNotificationCallbacks(mOriginalCallbacks, loadGroup, NS_GET_IID(nsIProgressEventSink), getter_AddRefs(target)); if (!target) { return NS_OK; } return target->OnProgress(mImageRequest, ctxt, progress, progressMax); } NS_IMETHODIMP nsProgressNotificationProxy::OnStatus(nsIRequest* request, nsISupports* ctxt, nsresult status, const char16_t* statusArg) { nsCOMPtr loadGroup; request->GetLoadGroup(getter_AddRefs(loadGroup)); nsCOMPtr target; NS_QueryNotificationCallbacks(mOriginalCallbacks, loadGroup, NS_GET_IID(nsIProgressEventSink), getter_AddRefs(target)); if (!target) { return NS_OK; } return target->OnStatus(mImageRequest, ctxt, status, statusArg); } NS_IMETHODIMP nsProgressNotificationProxy:: AsyncOnChannelRedirect(nsIChannel* oldChannel, nsIChannel* newChannel, uint32_t flags, nsIAsyncVerifyRedirectCallback* cb) { // Tell the original original callbacks about it too nsCOMPtr loadGroup; newChannel->GetLoadGroup(getter_AddRefs(loadGroup)); nsCOMPtr 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(this); NS_ADDREF_THIS(); return NS_OK; } if (iid.Equals(NS_GET_IID(nsIChannelEventSink))) { *result = static_cast(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 request = new imgRequest(aLoader, aKey); RefPtr entry = new imgCacheEntry(aLoader, request, aForcePrincipalCheckForCacheEntry); aLoader->AddToUncachedImages(request); request.forget(aRequest); entry.forget(aEntry); } static bool ShouldRevalidateEntry(imgCacheEntry* aEntry, nsLoadFlags aFlags, bool aHasExpired) { bool bValidateEntry = false; if (aFlags & nsIRequest::LOAD_BYPASS_CACHE) { return false; } if (aFlags & nsIRequest::VALIDATE_ALWAYS) { bValidateEntry = true; } else if (aEntry->GetMustValidate()) { bValidateEntry = true; } else if (aHasExpired) { // The cache entry has expired... Determine whether the stale cache // entry can be used without validation... if (aFlags & (nsIRequest::VALIDATE_NEVER | nsIRequest::VALIDATE_ONCE_PER_SESSION)) { // 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. bValidateEntry = false; } else if (!(aFlags & nsIRequest::LOAD_FROM_CACHE)) { // LOAD_FROM_CACHE allows a stale cache entry to be used... Otherwise, // the entry must be revalidated. bValidateEntry = true; } } return bValidateEntry; } /* Call content policies on cached images that went through a redirect */ static bool ShouldLoadCachedImage(imgRequest* aImgRequest, nsISupports* aLoadingContext, nsIPrincipal* aLoadingPrincipal) { /* 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 desitnation. Here we test the final destination using * mCurrentURI 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 contentLocation; aImgRequest->GetCurrentURI(getter_AddRefs(contentLocation)); nsresult rv; int16_t decision = nsIContentPolicy::REJECT_REQUEST; rv = NS_CheckContentLoadPolicy(nsIContentPolicy::TYPE_INTERNAL_IMAGE, contentLocation, aLoadingPrincipal, aLoadingContext, EmptyCString(), //mime guess nullptr, //aExtra &decision, nsContentUtils::GetContentPolicy(), nsContentUtils::GetSecurityManager()); 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) { if (!nsContentUtils::IsSystemPrincipal(aLoadingPrincipal)) { // Set the requestingLocation from the aLoadingPrincipal. nsCOMPtr requestingLocation; if (aLoadingPrincipal) { rv = aLoadingPrincipal->GetURI(getter_AddRefs(requestingLocation)); NS_ENSURE_SUCCESS(rv, false); } // reset the decision for mixed content blocker check decision = nsIContentPolicy::REJECT_REQUEST; rv = nsMixedContentBlocker::ShouldLoad(insecureRedirect, nsIContentPolicy::TYPE_IMAGE, contentLocation, requestingLocation, aLoadingContext, EmptyCString(), //mime guess nullptr, aLoadingPrincipal, &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. Also checks the Referrer Policy, since requests with different // referrers/policies may generate different responses. static bool ValidateSecurityInfo(imgRequest* request, bool forcePrincipalCheck, int32_t corsmode, nsIPrincipal* loadingPrincipal, nsISupports* aCX, ReferrerPolicy referrerPolicy) { // If the entry's Referrer Policy doesn't match, we can't use this request. // XXX: this will return false if an image has different referrer attributes, // i.e. we currently don't use the cached image but reload the image with // the new referrer policy bug 1174921 if (referrerPolicy != request->GetReferrerPolicy()) { return false; } // 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 (request->GetCORSMode() != corsmode) { return false; } else if (request->GetCORSMode() != imgIRequest::CORS_NONE || forcePrincipalCheck) { nsCOMPtr otherprincipal = request->GetLoadingPrincipal(); // If we previously had a principal, but we don't now, we can't use this // request. if (otherprincipal && !loadingPrincipal) { return false; } if (otherprincipal && loadingPrincipal) { bool equals = false; otherprincipal->Equals(loadingPrincipal, &equals); if (!equals) { return false; } } } // Content Policy Check on Cached Images return ShouldLoadCachedImage(request, aCX, loadingPrincipal); } 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 // aLoadingPrincipal and false otherwise. bool* aForcePrincipalCheckForCacheEntry, nsIURI* aURI, nsIURI* aInitialDocumentURI, nsIURI* aReferringURI, ReferrerPolicy aReferrerPolicy, nsILoadGroup* aLoadGroup, const nsCString& aAcceptHeader, nsLoadFlags aLoadFlags, nsContentPolicyType aPolicyType, nsIPrincipal* aLoadingPrincipal, nsISupports* aRequestingContext) { MOZ_ASSERT(aResult); nsresult rv; nsCOMPtr newHttpChannel; nsCOMPtr 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. // aLoadFlags |= nsIChannel::LOAD_CLASSIFY_URI; nsCOMPtr triggeringPrincipal = aLoadingPrincipal; bool isSandBoxed = false; // only inherit if we have a principal bool inherit = false; if (triggeringPrincipal) { inherit = nsContentUtils:: ChannelShouldInheritPrincipal(triggeringPrincipal, aURI, false, // aInheritForAboutBlank false); // aForceInherit } else { triggeringPrincipal = nsContentUtils::GetSystemPrincipal(); } nsCOMPtr requestingNode = do_QueryInterface(aRequestingContext); nsSecurityFlags securityFlags = nsILoadInfo::SEC_NORMAL; if (inherit) { securityFlags |= nsILoadInfo::SEC_FORCE_INHERIT_PRINCIPAL; } // 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 (requestingNode) { rv = NS_NewChannelWithTriggeringPrincipal(aResult, aURI, requestingNode, triggeringPrincipal, securityFlags, aPolicyType, nullptr, // loadGroup callbacks, aLoadFlags); } 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 // should always be the systemPrincipal. // However, there are two exceptions: one is Notifications and the // other one is Favicons which create a channel in the parent prcoess // in which case we can't get a requestingNode. rv = NS_NewChannel(aResult, aURI, triggeringPrincipal, securityFlags, aPolicyType, nullptr, // loadGroup callbacks, aLoadFlags); } if (NS_FAILED(rv)) { return rv; } *aForcePrincipalCheckForCacheEntry = inherit && !isSandBoxed; // Initialize HTTP-specific attributes newHttpChannel = do_QueryInterface(*aResult); if (newHttpChannel) { newHttpChannel->SetRequestHeader(NS_LITERAL_CSTRING("Accept"), aAcceptHeader, false); nsCOMPtr httpChannelInternal = do_QueryInterface(newHttpChannel); NS_ENSURE_TRUE(httpChannelInternal, NS_ERROR_UNEXPECTED); httpChannelInternal->SetDocumentURI(aInitialDocumentURI); newHttpChannel->SetReferrerWithPolicy(aReferringURI, aReferrerPolicy); } // Image channels are loaded by default with reduced priority. nsCOMPtr 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 loadGroup = do_CreateInstance(NS_LOADGROUP_CONTRACTID); nsCOMPtr childLoadGroup = do_QueryInterface(loadGroup); if (childLoadGroup) { childLoadGroup->SetParentLoadGroup(aLoadGroup); } (*aResult)->SetLoadGroup(loadGroup); return NS_OK; } static uint32_t SecondsFromPRTime(PRTime prTime) { return uint32_t(int64_t(prTime) / int64_t(PR_USEC_PER_SEC)); } 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) { } imgCacheEntry::~imgCacheEntry() { LOG_FUNC(GetImgLog(), "imgCacheEntry::~imgCacheEntry()"); } void imgCacheEntry::Touch(bool updateTime /* = true */) { LOG_SCOPE(GetImgLog(), "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(mRequest->IsChrome(), diff); } } void imgCacheEntry::UpdateLoadTime() { mLoadTime = SecondsFromPRTime(PR_Now()); } void imgCacheEntry::SetHasNoProxies(bool hasNoProxies) { if (MOZ_LOG_TEST(GetImgLog(), LogLevel::Debug)) { if (hasNoProxies) { LOG_FUNC_WITH_PARAM(GetImgLog(), "imgCacheEntry::SetHasNoProxies true", "uri", mRequest->CacheKey().Spec()); } else { LOG_FUNC_WITH_PARAM(GetImgLog(), "imgCacheEntry::SetHasNoProxies false", "uri", mRequest->CacheKey().Spec()); } } mHasNoProxies = hasNoProxies; } imgCacheQueue::imgCacheQueue() : mDirty(false), mSize(0) { } void imgCacheQueue::UpdateSize(int32_t diff) { mSize += diff; } uint32_t imgCacheQueue::GetSize() const { return mSize; } #include using namespace std; void imgCacheQueue::Remove(imgCacheEntry* entry) { queueContainer::iterator it = find(mQueue.begin(), mQueue.end(), entry); if (it != mQueue.end()) { mSize -= (*it)->GetDataSize(); mQueue.erase(it); MarkDirty(); } } void imgCacheQueue::Push(imgCacheEntry* entry) { mSize += entry->GetDataSize(); RefPtr refptr(entry); mQueue.push_back(refptr); MarkDirty(); } already_AddRefed imgCacheQueue::Pop() { if (mQueue.empty()) { return nullptr; } if (IsDirty()) { Refresh(); } RefPtr entry = mQueue[0]; std::pop_heap(mQueue.begin(), mQueue.end(), imgLoader::CompareCacheEntries); mQueue.pop_back(); mSize -= entry->GetDataSize(); return entry.forget(); } void imgCacheQueue::Refresh() { 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.size(); } 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, nsILoadGroup* aLoadGroup, imgINotificationObserver* aObserver, nsLoadFlags aLoadFlags, imgRequestProxy** _retval) { LOG_SCOPE_WITH_PARAM(GetImgLog(), "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 proxyRequest = new imgRequestProxy(); /* It is important to call |SetLoadFlags()| before calling |Init()| because |Init()| adds the request to the loadgroup. */ proxyRequest->SetLoadFlags(aLoadFlags); RefPtr uri; aRequest->GetURI(getter_AddRefs(uri)); // init adds itself to imgRequest's list of observers nsresult rv = proxyRequest->Init(aRequest, aLoadGroup, uri, aObserver); if (NS_WARN_IF(NS_FAILED(rv))) { return rv; } proxyRequest.forget(_retval); return NS_OK; } class imgCacheExpirationTracker final : public nsExpirationTracker { enum { TIMEOUT_SECONDS = 10 }; public: imgCacheExpirationTracker(); protected: void NotifyExpired(imgCacheEntry* entry); }; imgCacheExpirationTracker::imgCacheExpirationTracker() : nsExpirationTracker(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 kungFuDeathGrip(entry); if (MOZ_LOG_TEST(GetImgLog(), LogLevel::Debug)) { RefPtr req = entry->GetRequest(); if (req) { LOG_FUNC_WITH_PARAM(GetImgLog(), "imgCacheExpirationTracker::NotifyExpired", "entry", req->CacheKey().Spec()); } } // 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* gSingleton = nullptr; static imgLoader* gPBSingleton = nullptr; imgLoader* imgLoader::Singleton() { if (!gSingleton) { gSingleton = imgLoader::Create(); } return gSingleton; } imgLoader* imgLoader::PBSingleton() { if (!gPBSingleton) { gPBSingleton = imgLoader::Create(); gPBSingleton->RespectPrivacyNotifications(); } return gPBSingleton; } imgLoader::imgLoader() : mUncachedImagesMutex("imgLoader::UncachedImages"), mRespectPrivacy(false) { sMemReporter->AddRef(); sMemReporter->RegisterLoader(this); } already_AddRefed imgLoader::GetInstance() { static RefPtr singleton; if (!singleton) { singleton = imgLoader::Create(); if (!singleton) { return nullptr; } ClearOnShutdown(&singleton); } RefPtr loader = singleton.get(); return loader.forget(); } imgLoader::~imgLoader() { ClearChromeImageCache(); 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 (auto iter = mUncachedImages.Iter(); !iter.Done(); iter.Next()) { nsPtrHashKey* entry = iter.Get(); RefPtr req = entry->GetKey(); req->ClearLoader(); } } sMemReporter->UnregisterLoader(this); sMemReporter->Release(); } void imgLoader::VerifyCacheSizes() { #ifdef DEBUG if (!mCacheTracker) { return; } uint32_t cachesize = mCache.Count() + mChromeCache.Count(); uint32_t queuesize = mCacheQueue.GetNumElements() + mChromeCacheQueue.GetNumElements(); uint32_t trackersize = 0; for (nsExpirationTracker::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 } imgLoader::imgCacheTable& imgLoader::GetCache(bool aForChrome) { return aForChrome ? mChromeCache : mCache; } imgLoader::imgCacheTable& imgLoader::GetCache(const ImageCacheKey& aKey) { return GetCache(aKey.IsChrome()); } imgCacheQueue& imgLoader::GetCacheQueue(bool aForChrome) { return aForChrome ? mChromeCacheQueue : mCacheQueue; } imgCacheQueue& imgLoader::GetCacheQueue(const ImageCacheKey& aKey) { return GetCacheQueue(aKey.IsChrome()); } void imgLoader::GlobalInit() { sCacheTimeWeight = gfxPrefs::ImageCacheTimeWeight() / 1000.0; int32_t cachesize = gfxPrefs::ImageCacheSize(); sCacheMaxSize = cachesize > 0 ? cachesize : 0; sMemReporter = new imgMemoryReporter(); RegisterStrongMemoryReporter(sMemReporter); RegisterImagesContentUsedUncompressedDistinguishedAmount( imgMemoryReporter::ImagesContentUsedUncompressedDistinguishedAmount); } nsresult imgLoader::InitCache() { nsCOMPtr os = mozilla::services::GetObserverService(); if (!os) { return NS_ERROR_FAILURE; } os->AddObserver(this, "memory-pressure", false); os->AddObserver(this, "app-theme-changed", false); os->AddObserver(this, "chrome-flush-skin-caches", 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(); return NS_OK; } nsresult imgLoader::Init() { InitCache(); ReadAcceptHeaderPref(); Preferences::AddWeakObserver(this, "image.http.accept"); 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) { // We listen for pref change notifications... if (!strcmp(aTopic, NS_PREFBRANCH_PREFCHANGE_TOPIC_ID)) { if (!NS_strcmp(aData, MOZ_UTF16("image.http.accept"))) { ReadAcceptHeaderPref(); } } else if (strcmp(aTopic, "memory-pressure") == 0) { MinimizeCaches(); } else if (strcmp(aTopic, "app-theme-changed") == 0) { ClearImageCache(); MinimizeCaches(); } else if (strcmp(aTopic, "chrome-flush-skin-caches") == 0 || strcmp(aTopic, "chrome-flush-caches") == 0) { MinimizeCaches(); ClearChromeImageCache(); } else if (strcmp(aTopic, "last-pb-context-exited") == 0) { if (mRespectPrivacy) { ClearImageCache(); ClearChromeImageCache(); } } else if (strcmp(aTopic, "profile-before-change") == 0 || strcmp(aTopic, "xpcom-shutdown") == 0) { mCacheTracker = nullptr; } else { // (Nothing else should bring us here) MOZ_ASSERT(0, "Invalid topic received"); } return NS_OK; } void imgLoader::ReadAcceptHeaderPref() { nsAdoptingCString accept = Preferences::GetCString("image.http.accept"); if (accept) { mAcceptHeader = accept; } else { mAcceptHeader = IMAGE_PNG "," IMAGE_WILDCARD ";q=0.8," ANY_WILDCARD ";q=0.5"; } } NS_IMETHODIMP imgLoader::ClearCache(bool chrome) { if (chrome) { return ClearChromeImageCache(); } else { return ClearImageCache(); } } NS_IMETHODIMP imgLoader::RemoveEntry(nsIURI* aURI) { if (aURI && RemoveFromCache(ImageCacheKey(aURI))) { return NS_OK; } return NS_ERROR_NOT_AVAILABLE; } NS_IMETHODIMP imgLoader::FindEntryProperties(nsIURI* uri, nsIProperties** _retval) { *_retval = nullptr; ImageCacheKey key(uri); imgCacheTable& cache = GetCache(key); RefPtr entry; if (cache.Get(key, getter_AddRefs(entry)) && entry) { if (mCacheTracker && entry->HasNoProxies()) { mCacheTracker->MarkUsed(entry); } RefPtr request = entry->GetRequest(); if (request) { nsCOMPtr properties = request->Properties(); properties.forget(_retval); } } return NS_OK; } void imgLoader::Shutdown() { NS_IF_RELEASE(gSingleton); NS_IF_RELEASE(gPBSingleton); } nsresult imgLoader::ClearChromeImageCache() { return EvictEntries(mChromeCache); } nsresult imgLoader::ClearImageCache() { return EvictEntries(mCache); } void imgLoader::MinimizeCaches() { EvictEntries(mCacheQueue); EvictEntries(mChromeCacheQueue); } bool imgLoader::PutIntoCache(const ImageCacheKey& aKey, imgCacheEntry* entry) { imgCacheTable& cache = GetCache(aKey); LOG_STATIC_FUNC_WITH_PARAM(GetImgLog(), "imgLoader::PutIntoCache", "uri", aKey.Spec()); // Check to see if this request already exists in the cache. If so, we'll // replace the old version. RefPtr tmpCacheEntry; if (cache.Get(aKey, getter_AddRefs(tmpCacheEntry)) && tmpCacheEntry) { MOZ_LOG(GetImgLog(), LogLevel::Debug, ("[this=%p] imgLoader::PutIntoCache -- Element already in the cache", nullptr)); RefPtr 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(GetImgLog(), LogLevel::Debug, ("[this=%p] imgLoader::PutIntoCache -- Replacing cached element", nullptr)); RemoveFromCache(aKey); } else { MOZ_LOG(GetImgLog(), LogLevel::Debug, ("[this=%p] imgLoader::PutIntoCache --" " Element NOT already in the cache", nullptr)); } cache.Put(aKey, 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)) { imgCacheQueue& queue = GetCacheQueue(aKey); queue.Push(entry); } } RefPtr request = entry->GetRequest(); request->SetIsInCache(true); RemoveFromUncachedImages(request); return true; } bool imgLoader::SetHasNoProxies(imgRequest* aRequest, imgCacheEntry* aEntry) { LOG_STATIC_FUNC_WITH_PARAM(GetImgLog(), "imgLoader::SetHasNoProxies", "uri", aRequest->CacheKey().Spec()); aEntry->SetHasNoProxies(true); if (aEntry->Evicted()) { return false; } imgCacheQueue& queue = GetCacheQueue(aRequest->IsChrome()); nsresult addrv = NS_OK; if (mCacheTracker) { addrv = mCacheTracker->AddObject(aEntry); } if (NS_SUCCEEDED(addrv)) { queue.Push(aEntry); } imgCacheTable& cache = GetCache(aRequest->IsChrome()); CheckCacheLimits(cache, queue); return true; } bool imgLoader::SetHasProxies(imgRequest* aRequest) { VerifyCacheSizes(); const ImageCacheKey& key = aRequest->CacheKey(); imgCacheTable& cache = GetCache(key); LOG_STATIC_FUNC_WITH_PARAM(GetImgLog(), "imgLoader::SetHasProxies", "uri", key.Spec()); RefPtr entry; if (cache.Get(key, getter_AddRefs(entry)) && entry) { // Make sure the cache entry is for the right request RefPtr entryRequest = entry->GetRequest(); if (entryRequest == aRequest && entry->HasNoProxies()) { imgCacheQueue& queue = GetCacheQueue(key); queue.Remove(entry); if (mCacheTracker) { mCacheTracker->RemoveObject(entry); } entry->SetHasNoProxies(false); return true; } } return false; } void imgLoader::CacheEntriesChanged(bool aForChrome, int32_t aSizeDiff /* = 0 */) { imgCacheQueue& queue = GetCacheQueue(aForChrome); queue.MarkDirty(); queue.UpdateSize(aSizeDiff); } void imgLoader::CheckCacheLimits(imgCacheTable& cache, imgCacheQueue& queue) { if (queue.GetNumElements() == 0) { NS_ASSERTION(queue.GetSize() == 0, "imgLoader::CheckCacheLimits -- incorrect cache size"); } // Remove entries from the cache until we're back at our desired max size. while (queue.GetSize() > sCacheMaxSize) { // Remove the first entry in the queue. RefPtr entry(queue.Pop()); NS_ASSERTION(entry, "imgLoader::CheckCacheLimits -- NULL entry pointer"); if (MOZ_LOG_TEST(GetImgLog(), LogLevel::Debug)) { RefPtr req = entry->GetRequest(); if (req) { LOG_STATIC_FUNC_WITH_PARAM(GetImgLog(), "imgLoader::CheckCacheLimits", "entry", req->CacheKey().Spec()); } } if (entry) { RemoveFromCache(entry); } } } bool imgLoader::ValidateRequestWithNewChannel(imgRequest* request, nsIURI* aURI, nsIURI* aInitialDocumentURI, nsIURI* aReferrerURI, ReferrerPolicy aReferrerPolicy, nsILoadGroup* aLoadGroup, imgINotificationObserver* aObserver, nsISupports* aCX, nsLoadFlags aLoadFlags, nsContentPolicyType aLoadPolicyType, imgRequestProxy** aProxyRequest, nsIPrincipal* aLoadingPrincipal, int32_t aCORSMode) { // now we need to insert a new channel request object inbetween 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 (request->GetValidator()) { rv = CreateNewProxyForRequest(request, aLoadGroup, aObserver, aLoadFlags, aProxyRequest); if (NS_FAILED(rv)) { return false; } if (*aProxyRequest) { imgRequestProxy* proxy = static_cast(*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 RequestDecode(). See bug 579122. proxy->SetNotificationsDeferred(true); // Attach the proxy without notifying request->GetValidator()->AddProxy(proxy); } return NS_SUCCEEDED(rv); } else { // 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 newChannel; bool forcePrincipalCheck; rv = NewImageChannel(getter_AddRefs(newChannel), &forcePrincipalCheck, aURI, aInitialDocumentURI, aReferrerURI, aReferrerPolicy, aLoadGroup, mAcceptHeader, aLoadFlags, aLoadPolicyType, aLoadingPrincipal, aCX); if (NS_FAILED(rv)) { return false; } RefPtr req; rv = CreateNewProxyForRequest(request, aLoadGroup, aObserver, aLoadFlags, getter_AddRefs(req)); if (NS_FAILED(rv)) { return false; } // Make sure that OnStatus/OnProgress calls have the right request set... RefPtr progressproxy = new nsProgressNotificationProxy(newChannel, req); if (!progressproxy) { return false; } RefPtr hvc = new imgCacheValidator(progressproxy, this, request, aCX, forcePrincipalCheck); // Casting needed here to get past multiple inheritance. nsCOMPtr listener = do_QueryInterface(static_cast(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); if (aCORSMode != imgIRequest::CORS_NONE) { bool withCredentials = aCORSMode == imgIRequest::CORS_USE_CREDENTIALS; RefPtr corsproxy = new nsCORSListenerProxy(listener, aLoadingPrincipal, withCredentials); rv = corsproxy->Init(newChannel, DataURIHandling::Allow); if (NS_FAILED(rv)) { return false; } listener = corsproxy; } 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 RequestDecode(). See bug 579122. req->SetNotificationsDeferred(true); // Add the proxy without notifying hvc->AddProxy(req); mozilla::net::PredictorLearn(aURI, aInitialDocumentURI, nsINetworkPredictor::LEARN_LOAD_SUBRESOURCE, aLoadGroup); rv = newChannel->AsyncOpen(listener, nullptr); if (NS_WARN_IF(NS_FAILED(rv))) { return false; } req.forget(aProxyRequest); return true; } } bool imgLoader::ValidateEntry(imgCacheEntry* aEntry, nsIURI* aURI, nsIURI* aInitialDocumentURI, nsIURI* aReferrerURI, ReferrerPolicy aReferrerPolicy, nsILoadGroup* aLoadGroup, imgINotificationObserver* aObserver, nsISupports* aCX, nsLoadFlags aLoadFlags, nsContentPolicyType aLoadPolicyType, bool aCanMakeNewChannel, imgRequestProxy** aProxyRequest, nsIPrincipal* aLoadingPrincipal, int32_t aCORSMode) { LOG_SCOPE(GetImgLog(), "imgLoader::ValidateEntry"); bool hasExpired; uint32_t expirationTime = aEntry->GetExpiryTime(); if (expirationTime <= SecondsFromPRTime(PR_Now())) { hasExpired = true; } else { hasExpired = false; } nsresult rv; // Special treatment for file URLs - aEntry has expired if file has changed nsCOMPtr fileUrl(do_QueryInterface(aURI)); if (fileUrl) { uint32_t lastModTime = aEntry->GetLoadTime(); nsCOMPtr 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 request(aEntry->GetRequest()); if (!request) { return false; } if (!ValidateSecurityInfo(request, aEntry->ForcePrincipalCheck(), aCORSMode, aLoadingPrincipal, aCX, aReferrerPolicy)) 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. nsAutoCString scheme; aURI->GetScheme(scheme); if (scheme.EqualsLiteral("data") && !(aLoadFlags & nsIRequest::LOAD_BYPASS_CACHE)) { return true; } bool validateRequest = false; // If the request's loadId is the same as the aCX, then it is ok to use // this one because it has already been validated for this context. // // XXX: nullptr seems to be a 'special' key value that indicates that NO // validation is required. // void *key = (void*) aCX; if (request->LoadId() != key) { // 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; } // Determine whether the cache aEntry must be revalidated... validateRequest = ShouldRevalidateEntry(aEntry, aLoadFlags, hasExpired); MOZ_LOG(GetImgLog(), LogLevel::Debug, ("imgLoader::ValidateEntry validating cache entry. " "validateRequest = %d", validateRequest)); } else if (!key && MOZ_LOG_TEST(GetImgLog(), LogLevel::Debug)) { nsAutoCString spec; aURI->GetSpec(spec); MOZ_LOG(GetImgLog(), LogLevel::Debug, ("imgLoader::ValidateEntry BYPASSING cache validation for %s " "because of NULL LoadID", spec.get())); } // We can't use a cached request if it comes from a different // application cache than this load is expecting. nsCOMPtr appCacheContainer; nsCOMPtr requestAppCache; nsCOMPtr groupAppCache; if ((appCacheContainer = do_GetInterface(request->GetRequest()))) { appCacheContainer->GetApplicationCache(getter_AddRefs(requestAppCache)); } if ((appCacheContainer = do_QueryInterface(aLoadGroup))) { appCacheContainer->GetApplicationCache(getter_AddRefs(groupAppCache)); } if (requestAppCache != groupAppCache) { MOZ_LOG(GetImgLog(), LogLevel::Debug, ("imgLoader::ValidateEntry - Unable to use cached imgRequest " "[request=%p] because of mismatched application caches\n", address_of(request))); return false; } if (validateRequest && aCanMakeNewChannel) { LOG_SCOPE(GetImgLog(), "imgLoader::ValidateRequest |cache hit| must validate"); return ValidateRequestWithNewChannel(request, aURI, aInitialDocumentURI, aReferrerURI, aReferrerPolicy, aLoadGroup, aObserver, aCX, aLoadFlags, aLoadPolicyType, aProxyRequest, aLoadingPrincipal, aCORSMode); } return !validateRequest; } bool imgLoader::RemoveFromCache(const ImageCacheKey& aKey) { LOG_STATIC_FUNC_WITH_PARAM(GetImgLog(), "imgLoader::RemoveFromCache", "uri", aKey.Spec()); imgCacheTable& cache = GetCache(aKey); imgCacheQueue& queue = GetCacheQueue(aKey); RefPtr entry; if (cache.Get(aKey, getter_AddRefs(entry)) && entry) { cache.Remove(aKey); 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); } queue.Remove(entry); } entry->SetEvicted(true); RefPtr request = entry->GetRequest(); request->SetIsInCache(false); AddToUncachedImages(request); return true; } else { return false; } } bool imgLoader::RemoveFromCache(imgCacheEntry* entry) { LOG_STATIC_FUNC(GetImgLog(), "imgLoader::RemoveFromCache entry"); RefPtr request = entry->GetRequest(); if (request) { const ImageCacheKey& key = request->CacheKey(); imgCacheTable& cache = GetCache(key); imgCacheQueue& queue = GetCacheQueue(key); LOG_STATIC_FUNC_WITH_PARAM(GetImgLog(), "imgLoader::RemoveFromCache", "entry's uri", key.Spec()); cache.Remove(key); if (entry->HasNoProxies()) { LOG_STATIC_FUNC(GetImgLog(), "imgLoader::RemoveFromCache removing from tracker"); if (mCacheTracker) { mCacheTracker->RemoveObject(entry); } queue.Remove(entry); } entry->SetEvicted(true); request->SetIsInCache(false); AddToUncachedImages(request); return true; } return false; } static PLDHashOperator EnumEvictEntries(const ImageCacheKey&, RefPtr& aData, void* data) { nsTArray >* entries = reinterpret_cast > *>(data); entries->AppendElement(aData); return PL_DHASH_NEXT; } nsresult imgLoader::EvictEntries(imgCacheTable& aCacheToClear) { LOG_STATIC_FUNC(GetImgLog(), "imgLoader::EvictEntries table"); // We have to make a temporary, since RemoveFromCache removes the element // from the queue, invalidating iterators. nsTArray > entries; aCacheToClear.Enumerate(EnumEvictEntries, &entries); for (uint32_t i = 0; i < entries.Length(); ++i) { if (!RemoveFromCache(entries[i])) { return NS_ERROR_FAILURE; } } MOZ_ASSERT(aCacheToClear.Count() == 0); return NS_OK; } nsresult imgLoader::EvictEntries(imgCacheQueue& aQueueToClear) { LOG_STATIC_FUNC(GetImgLog(), "imgLoader::EvictEntries queue"); // We have to make a temporary, since RemoveFromCache removes the element // from the queue, invalidating iterators. nsTArray > entries(aQueueToClear.GetNumElements()); for (imgCacheQueue::const_iterator i = aQueueToClear.begin(); i != aQueueToClear.end(); ++i) { entries.AppendElement(*i); } for (uint32_t i = 0; i < entries.Length(); ++i) { if (!RemoveFromCache(entries[i])) { return NS_ERROR_FAILURE; } } MOZ_ASSERT(aQueueToClear.GetNumElements() == 0); return NS_OK; } void imgLoader::AddToUncachedImages(imgRequest* aRequest) { MutexAutoLock lock(mUncachedImagesMutex); mUncachedImages.PutEntry(aRequest); } void imgLoader::RemoveFromUncachedImages(imgRequest* aRequest) { MutexAutoLock lock(mUncachedImagesMutex); mUncachedImages.RemoveEntry(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, nsIURI* aReferrerURI, const nsAString& aReferrerPolicy, nsIPrincipal* aLoadingPrincipal, nsILoadGroup* aLoadGroup, imgINotificationObserver* aObserver, nsISupports* aCX, 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; ReferrerPolicy refpol = ReferrerPolicyFromString(aReferrerPolicy); nsresult rv = LoadImage(aURI, aInitialDocumentURI, aReferrerURI, refpol, aLoadingPrincipal, aLoadGroup, aObserver, aCX, aLoadFlags, aCacheKey, aContentPolicyType, EmptyString(), &proxy); *_retval = proxy; return rv; } nsresult imgLoader::LoadImage(nsIURI* aURI, nsIURI* aInitialDocumentURI, nsIURI* aReferrerURI, ReferrerPolicy aReferrerPolicy, nsIPrincipal* aLoadingPrincipal, nsILoadGroup* aLoadGroup, imgINotificationObserver* aObserver, nsISupports* aCX, nsLoadFlags aLoadFlags, nsISupports* aCacheKey, nsContentPolicyType aContentPolicyType, const nsAString& initiatorType, imgRequestProxy** _retval) { VerifyCacheSizes(); NS_ASSERTION(aURI, "imgLoader::LoadImage -- NULL URI pointer"); if (!aURI) { return NS_ERROR_NULL_POINTER; } nsAutoCString spec; aURI->GetSpec(spec); LOG_SCOPE_WITH_PARAM(GetImgLog(), "imgLoader::LoadImage", "aURI", spec.get()); *_retval = nullptr; RefPtr request; nsresult rv; nsLoadFlags requestFlags = nsIRequest::LOAD_NORMAL; #ifdef DEBUG bool isPrivate = false; if (aLoadGroup) { nsCOMPtr callbacks; aLoadGroup->GetNotificationCallbacks(getter_AddRefs(callbacks)); if (callbacks) { nsCOMPtr loadContext = do_GetInterface(callbacks); isPrivate = loadContext && loadContext->UsePrivateBrowsing(); } } MOZ_ASSERT(isPrivate == mRespectPrivacy); #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; } int32_t corsmode = imgIRequest::CORS_NONE; if (aLoadFlags & imgILoader::LOAD_CORS_ANONYMOUS) { corsmode = imgIRequest::CORS_ANONYMOUS; } else if (aLoadFlags & imgILoader::LOAD_CORS_USE_CREDENTIALS) { corsmode = imgIRequest::CORS_USE_CREDENTIALS; } RefPtr 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. ImageCacheKey key(aURI); imgCacheTable& cache = GetCache(key); if (cache.Get(key, getter_AddRefs(entry)) && entry) { if (ValidateEntry(entry, aURI, aInitialDocumentURI, aReferrerURI, aReferrerPolicy, aLoadGroup, aObserver, aCX, requestFlags, aContentPolicyType, true, _retval, aLoadingPrincipal, corsmode)) { request = entry->GetRequest(); // If this entry has no proxies, its request has no reference to the // entry. if (entry->HasNoProxies()) { LOG_FUNC_WITH_PARAM(GetImgLog(), "imgLoader::LoadImage() adding proxyless entry", "uri", key.Spec()); MOZ_ASSERT(!request->HasCacheEntry(), "Proxyless entry's request has cache entry!"); request->SetCacheEntry(entry); if (mCacheTracker) { mCacheTracker->MarkUsed(entry); } } entry->Touch(); #ifdef DEBUG_joe printf("CACHEGET: %d %s %d\n", time(nullptr), spec.get(), entry->SizeOfData()); #endif } 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 newChannel; // If we didn't get a cache hit, we need to load from the network. if (!request) { LOG_SCOPE(GetImgLog(), "imgLoader::LoadImage |cache miss|"); bool forcePrincipalCheck; rv = NewImageChannel(getter_AddRefs(newChannel), &forcePrincipalCheck, aURI, aInitialDocumentURI, aReferrerURI, aReferrerPolicy, aLoadGroup, mAcceptHeader, requestFlags, aContentPolicyType, aLoadingPrincipal, aCX); 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(GetImgLog(), LogLevel::Debug, ("[this=%p] imgLoader::LoadImage -- Created new imgRequest" " [request=%p]\n", this, request.get())); nsCOMPtr channelLoadGroup; newChannel->GetLoadGroup(getter_AddRefs(channelLoadGroup)); request->Init(aURI, aURI, /* aHadInsecureRedirect = */ false, channelLoadGroup, newChannel, entry, aCX, aLoadingPrincipal, corsmode, aReferrerPolicy); // Add the initiator type for this image load nsCOMPtr timedChannel = do_QueryInterface(newChannel); if (timedChannel) { timedChannel->SetInitiatorType(initiatorType); } // create the proxy listener nsCOMPtr pl = new ProxyListener(request.get()); // See if we need to insert a CORS proxy between the proxy listener and the // request. nsCOMPtr listener = pl; if (corsmode != imgIRequest::CORS_NONE) { MOZ_LOG(GetImgLog(), LogLevel::Debug, ("[this=%p] imgLoader::LoadImage -- Setting up a CORS load", this)); bool withCredentials = corsmode == imgIRequest::CORS_USE_CREDENTIALS; RefPtr corsproxy = new nsCORSListenerProxy(pl, aLoadingPrincipal, withCredentials); rv = corsproxy->Init(newChannel, DataURIHandling::Allow); if (NS_FAILED(rv)) { MOZ_LOG(GetImgLog(), LogLevel::Debug, ("[this=%p] imgLoader::LoadImage -- nsCORSListenerProxy " "creation failed: 0x%x\n", this, rv)); request->CancelAndAbort(rv); return NS_ERROR_FAILURE; } listener = corsproxy; } MOZ_LOG(GetImgLog(), LogLevel::Debug, ("[this=%p] imgLoader::LoadImage -- Calling channel->AsyncOpen()\n", this)); mozilla::net::PredictorLearn(aURI, aInitialDocumentURI, nsINetworkPredictor::LEARN_LOAD_SUBRESOURCE, aLoadGroup); nsresult openRes = newChannel->AsyncOpen(listener, nullptr); if (NS_FAILED(openRes)) { MOZ_LOG(GetImgLog(), LogLevel::Debug, ("[this=%p] imgLoader::LoadImage -- AsyncOpen() failed: 0x%x\n", this, openRes)); request->CancelAndAbort(openRes); return openRes; } // Try to add the new request into the cache. PutIntoCache(key, entry); } else { LOG_MSG_WITH_PARAM(GetImgLog(), "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(aCX); LOG_MSG(GetImgLog(), "imgLoader::LoadImage", "creating proxy request."); rv = CreateNewProxyForRequest(request, aLoadGroup, 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 requestor( new nsProgressNotificationProxy(newChannel, proxy)); if (!requestor) { return NS_ERROR_OUT_OF_MEMORY; } newChannel->SetNotificationCallbacks(requestor); } // 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, nsISupports* aCX, nsIStreamListener** listener, imgIRequest** _retval) { nsresult result; imgRequestProxy* proxy; result = LoadImageWithChannel(channel, aObserver, aCX, listener, &proxy); *_retval = proxy; return result; } nsresult imgLoader::LoadImageWithChannel(nsIChannel* channel, imgINotificationObserver* aObserver, nsISupports* aCX, nsIStreamListener** listener, imgRequestProxy** _retval) { NS_ASSERTION(channel, "imgLoader::LoadImageWithChannel -- NULL channel pointer"); MOZ_ASSERT(NS_UsePrivateBrowsing(channel) == mRespectPrivacy); RefPtr request; nsCOMPtr uri; channel->GetURI(getter_AddRefs(uri)); ImageCacheKey key(uri); nsLoadFlags requestFlags = nsIRequest::LOAD_NORMAL; channel->GetLoadFlags(&requestFlags); RefPtr 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. imgCacheTable& cache = GetCache(key); if (cache.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 if (ValidateEntry(entry, uri, nullptr, nullptr, RP_Default, nullptr, aObserver, aCX, requestFlags, nsIContentPolicy::TYPE_INVALID, false, nullptr, nullptr, imgIRequest::CORS_NONE)) { request = entry->GetRequest(); } else { nsCOMPtr 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(GetImgLog(), "imgLoader::LoadImageWithChannel() adding proxyless entry", "uri", key.Spec()); MOZ_ASSERT(!request->HasCacheEntry(), "Proxyless entry's request has cache entry!"); request->SetCacheEntry(entry); if (mCacheTracker) { mCacheTracker->MarkUsed(entry); } } } } } nsCOMPtr loadGroup; channel->GetLoadGroup(getter_AddRefs(loadGroup)); // 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, loadGroup, aObserver, requestFlags, _retval); static_cast(*_retval)->NotifyListener(); } else { // We use originalURI here to fulfil the imgIRequest contract on GetURI. nsCOMPtr 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); // 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 // assoicated 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. request->Init(originalURI, uri, /* aHadInsecureRedirect = */ false, channel, channel, entry, aCX, nullptr, imgIRequest::CORS_NONE, RP_Default); RefPtr pl = new ProxyListener(static_cast(request.get())); pl.forget(listener); // Try to add the new request into the cache. PutIntoCache(originalURIKey, entry); rv = CreateNewProxyForRequest(request, loadGroup, 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. } return rv; } bool imgLoader::SupportImageWithMimeType(const char* 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) { return GetMimeTypeFromContent((const char*)aContents, aLength, aContentType); } /* static */ nsresult imgLoader::GetMimeTypeFromContent(const char* aContents, uint32_t aLength, nsACString& aContentType) { /* Is it a GIF? */ if (aLength >= 6 && (!nsCRT::strncmp(aContents, "GIF87a", 6) || !nsCRT::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 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 && !nsCRT::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); } 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) { /* member initializers and constructor code */ } ProxyListener::~ProxyListener() { /* destructor code */ } /** nsIRequestObserver methods **/ NS_IMETHODIMP ProxyListener::OnStartRequest(nsIRequest* aRequest, nsISupports* ctxt) { if (!mDestListener) { return NS_ERROR_FAILURE; } nsCOMPtr channel(do_QueryInterface(aRequest)); if (channel) { // We need to set the initiator type for the image load nsCOMPtr timedChannel = do_QueryInterface(channel); if (timedChannel) { nsAutoString type; timedChannel->GetInitiatorType(type); if (type.IsEmpty()) { timedChannel->SetInitiatorType(NS_LITERAL_STRING("img")); } } 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 (NS_LITERAL_CSTRING("multipart/x-mixed-replace").Equals(contentType)) { nsCOMPtr convServ( do_GetService("@mozilla.org/streamConverters;1", &rv)); if (NS_SUCCEEDED(rv)) { nsCOMPtr toListener(mDestListener); nsCOMPtr fromListener; rv = convServ->AsyncConvertData("multipart/x-mixed-replace", "*/*", toListener, nullptr, getter_AddRefs(fromListener)); if (NS_SUCCEEDED(rv)) { mDestListener = fromListener; } } } } } return mDestListener->OnStartRequest(aRequest, ctxt); } NS_IMETHODIMP ProxyListener::OnStopRequest(nsIRequest* aRequest, nsISupports* ctxt, nsresult status) { if (!mDestListener) { return NS_ERROR_FAILURE; } return mDestListener->OnStopRequest(aRequest, ctxt, status); } /** nsIStreamListener methods **/ NS_IMETHODIMP ProxyListener::OnDataAvailable(nsIRequest* aRequest, nsISupports* ctxt, nsIInputStream* inStr, uint64_t sourceOffset, uint32_t count) { if (!mDestListener) { return NS_ERROR_FAILURE; } return mDestListener->OnDataAvailable(aRequest, ctxt, inStr, sourceOffset, count); } /** nsThreadRetargetableStreamListener methods **/ NS_IMETHODIMP ProxyListener::CheckListenerChain() { NS_ASSERTION(NS_IsMainThread(), "Should be on the main thread!"); nsresult rv = NS_OK; nsCOMPtr retargetableListener = do_QueryInterface(mDestListener, &rv); if (retargetableListener) { rv = retargetableListener->CheckListenerChain(); } MOZ_LOG(GetImgLog(), LogLevel::Debug, ("ProxyListener::CheckListenerChain %s [this=%p listener=%p rv=%x]", (NS_SUCCEEDED(rv) ? "success" : "failure"), this, (nsIStreamListener*)mDestListener, 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, nsISupports* aContext, bool forcePrincipalCheckForCacheEntry) : mProgressProxy(progress), mRequest(request), mContext(aContext), mImgLoader(loader), mHadInsecureRedirect(false) { NewRequestAndEntry(forcePrincipalCheckForCacheEntry, loader, mRequest->CacheKey(), getter_AddRefs(mNewRequest), getter_AddRefs(mNewEntry)); } imgCacheValidator::~imgCacheValidator() { if (mRequest) { mRequest->SetValidator(nullptr); } } void imgCacheValidator::AddProxy(imgRequestProxy* aProxy) { // aProxy needs to be in the loadgroup since we're validating from // the network. aProxy->AddToLoadGroup(); mProxies.AppendObject(aProxy); } /** nsIRequestObserver methods **/ NS_IMETHODIMP imgCacheValidator::OnStartRequest(nsIRequest* aRequest, nsISupports* ctxt) { // We may be holding on to a document, so ensure that it's released. nsCOMPtr context = mContext.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->Cancel(NS_BINDING_ABORTED); 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 cacheChan(do_QueryInterface(aRequest)); nsCOMPtr channel(do_QueryInterface(aRequest)); if (cacheChan && channel && !mRequest->CacheChanged(aRequest)) { bool isFromCache = false; cacheChan->IsFromCache(&isFromCache); nsCOMPtr channelURI; channel->GetURI(getter_AddRefs(channelURI)); nsCOMPtr currentURI; mRequest->GetCurrentURI(getter_AddRefs(currentURI)); bool sameURI = false; if (channelURI && currentURI) { channelURI->Equals(currentURI, &sameURI); } if (isFromCache && sameURI) { uint32_t count = mProxies.Count(); for (int32_t i = count-1; i>=0; i--) { imgRequestProxy* proxy = static_cast(mProxies[i]); // Proxies waiting on cache validation should be deferring // notifications. Undefer them. MOZ_ASSERT(proxy->NotificationsDeferred(), "Proxies waiting on cache validation should be " "deferring notifications!"); proxy->SetNotificationsDeferred(false); // Notify synchronously, because we're already in OnStartRequest, an // asynchronously-called function. proxy->SyncNotifyListener(); } // We don't need to load this any more. aRequest->Cancel(NS_BINDING_ABORTED); mRequest->SetLoadId(context); mRequest->SetValidator(nullptr); mRequest = nullptr; mNewRequest = nullptr; mNewEntry = nullptr; 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 uri; { RefPtr imageURL; mRequest->GetURI(getter_AddRefs(imageURL)); uri = imageURL->ToIURI(); } if (MOZ_LOG_TEST(GetImgLog(), LogLevel::Debug)) { nsAutoCString spec; uri->GetSpec(spec); LOG_MSG_WITH_PARAM(GetImgLog(), "imgCacheValidator::OnStartRequest creating new request", "uri", spec.get()); } int32_t corsmode = mRequest->GetCORSMode(); ReferrerPolicy refpol = mRequest->GetReferrerPolicy(); nsCOMPtr loadingPrincipal = mRequest->GetLoadingPrincipal(); // Doom the old request's cache entry mRequest->RemoveFromCache(); mRequest->SetValidator(nullptr); mRequest = nullptr; // We use originalURI here to fulfil the imgIRequest contract on GetURI. nsCOMPtr originalURI; channel->GetOriginalURI(getter_AddRefs(originalURI)); mNewRequest->Init(originalURI, uri, mHadInsecureRedirect, aRequest, channel, mNewEntry, context, loadingPrincipal, corsmode, refpol); 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); uint32_t count = mProxies.Count(); for (int32_t i = count-1; i>=0; i--) { imgRequestProxy* proxy = static_cast(mProxies[i]); proxy->ChangeOwner(mNewRequest); // Notify synchronously, because we're already in OnStartRequest, an // asynchronously-called function. proxy->SetNotificationsDeferred(false); proxy->SyncNotifyListener(); } mNewRequest = nullptr; mNewEntry = nullptr; return mDestListener->OnStartRequest(aRequest, ctxt); } NS_IMETHODIMP imgCacheValidator::OnStopRequest(nsIRequest* aRequest, nsISupports* ctxt, nsresult status) { // Be sure we've released the document that we may have been holding on to. mContext = nullptr; if (!mDestListener) { return NS_OK; } return mDestListener->OnStopRequest(aRequest, ctxt, status); } /** nsIStreamListener methods **/ NS_IMETHODIMP imgCacheValidator::OnDataAvailable(nsIRequest* aRequest, nsISupports* ctxt, 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, ctxt, inStr, sourceOffset, count); } /** nsIThreadRetargetableStreamListener methods **/ NS_IMETHODIMP imgCacheValidator::CheckListenerChain() { NS_ASSERTION(NS_IsMainThread(), "Should be on the main thread!"); nsresult rv = NS_OK; nsCOMPtr retargetableListener = do_QueryInterface(mDestListener, &rv); if (retargetableListener) { rv = retargetableListener->CheckListenerChain(); } MOZ_LOG(GetImgLog(), LogLevel::Debug, ("[this=%p] imgCacheValidator::CheckListenerChain -- rv %d=%s", this, NS_SUCCEEDED(rv) ? "succeeded" : "failed", rv)); 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 oldURI; bool isHttps = false; bool isChrome = false; bool schemeLocal = false; if (NS_FAILED(oldChannel->GetURI(getter_AddRefs(oldURI))) || NS_FAILED(oldURI->SchemeIs("https", &isHttps)) || NS_FAILED(oldURI->SchemeIs("chrome", &isChrome)) || NS_FAILED(NS_URIChainHasFlags(oldURI, nsIProtocolHandler::URI_IS_LOCAL_RESOURCE, &schemeLocal)) || (!isHttps && !isChrome && !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 uri; mRedirectChannel->GetURI(getter_AddRefs(uri)); bool doesNotReturnData = false; NS_URIChainHasFlags(uri, nsIProtocolHandler::URI_DOES_NOT_RETURN_DATA, &doesNotReturnData); nsresult result = NS_OK; if (doesNotReturnData) { result = NS_ERROR_ABORT; } mRedirectCallback->OnRedirectVerifyCallback(result); mRedirectCallback = nullptr; mRedirectChannel = nullptr; return NS_OK; }