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imgLoader.cpp
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/* -*- 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.
#undef LoadImage
#include "ImageLogging.h"
#include "imgLoader.h"
#include "mozilla/Attributes.h"
#include "mozilla/ClearOnShutdown.h"
#include "mozilla/Move.h"
#include "mozilla/Preferences.h"
#include "mozilla/ChaosMode.h"
#include "nsImageModule.h"
#include "imgRequestProxy.h"
#include "nsCOMPtr.h"
#include "nsContentPolicyUtils.h"
#include "nsContentUtils.h"
#include "nsNetUtil.h"
#include "nsNetCID.h"
#include "nsIProtocolHandler.h"
#include "nsMimeTypes.h"
#include "nsStreamUtils.h"
#include "nsIHttpChannel.h"
#include "nsICacheInfoChannel.h"
#include "nsIClassOfService.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 "nsReadableUtils.h"
#include "mozilla/dom/ContentParent.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"
#include "nsIDOMDocument.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
{
nsTArray<ImageMemoryCounter> chrome;
nsTArray<ImageMemoryCounter> content;
nsTArray<ImageMemoryCounter> uncached;
for (uint32_t i = 0; i < mKnownLoaders.Length(); i++) {
for (auto iter = mKnownLoaders[i]->mChromeCache.Iter(); !iter.Done(); iter.Next()) {
imgCacheEntry* entry = iter.UserData();
RefPtr<imgRequest> req = entry->GetRequest();
RecordCounterForRequest(req, &chrome, !entry->HasNoProxies());
}
for (auto iter = mKnownLoaders[i]->mCache.Iter(); !iter.Done(); iter.Next()) {
imgCacheEntry* entry = iter.UserData();
RefPtr<imgRequest> req = entry->GetRequest();
RecordCounterForRequest(req, &content, !entry->HasNoProxies());
}
MutexAutoLock lock(mKnownLoaders[i]->mUncachedImagesMutex);
for (auto iter = mKnownLoaders[i]->mUncachedImages.Iter();
!iter.Done();
iter.Next()) {
nsPtrHashKey<imgRequest>* entry = iter.Get();
RefPtr<imgRequest> req = entry->GetKey();
RecordCounterForRequest(req, &uncached, req->HasConsumers());
}
}
// Note that we only need to anonymize content image URIs.
ReportCounterArray(aHandleReport, aData, chrome, "images/chrome");
ReportCounterArray(aHandleReport, aData, content, "images/content",
aAnonymize);
// Uncached images may be content or chrome, so anonymize them.
ReportCounterArray(aHandleReport, aData, uncached, "images/uncached",
aAnonymize);
return NS_OK;
}
static int64_t ImagesContentUsedUncompressedDistinguishedAmount()
{
size_t n = 0;
for (uint32_t i = 0; i < imgLoader::sMemReporter->mKnownLoaders.Length();
i++) {
for (auto iter = imgLoader::sMemReporter->mKnownLoaders[i]->mCache.Iter();
!iter.Done();
iter.Next()) {
imgCacheEntry* entry = iter.UserData();
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(image, state, /* aIsUsed = */ true);
n += counter.Values().DecodedHeap();
n += counter.Values().DecodedNonHeap();
}
}
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 {
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 = false)
{
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()) {
ReportImage(aHandleReport, aData, aPathPrefix, counter);
} else {
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)
{
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.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);
ReportSourceValue(aHandleReport, aData, pathPrefix, aCounter.Values());
}
static void ReportSurfaces(nsIHandleReportCallback* aHandleReport,
nsISupports* aData,
const nsACString& aPathPrefix,
const ImageMemoryCounter& aCounter)
{
for (const SurfaceMemoryCounter& counter : aCounter.Surfaces()) {
nsAutoCString surfacePathPrefix(aPathPrefix);
if (counter.IsLocked()) {
surfacePathPrefix.AppendLiteral("locked/");
} else {
surfacePathPrefix.AppendLiteral("unlocked/");
}
if (counter.IsFactor2()) {
surfacePathPrefix.AppendLiteral("factor2/");
}
if (counter.CannotSubstitute()) {
surfacePathPrefix.AppendLiteral("cannot_substitute/");
}
surfacePathPrefix.AppendLiteral("surface(");
surfacePathPrefix.AppendInt(counter.Key().Size().width);
surfacePathPrefix.AppendLiteral("x");
surfacePathPrefix.AppendInt(counter.Key().Size().height);
if (counter.Values().SharedHandles() > 0) {
surfacePathPrefix.AppendLiteral(", shared:");
surfacePathPrefix.AppendInt(uint32_t(counter.Values().SharedHandles()));
}
if (counter.Type() == SurfaceMemoryCounterType::NORMAL) {
PlaybackType playback = counter.Key().Playback();
surfacePathPrefix.Append(playback == PlaybackType::eAnimated
? " (animation)"
: "");
if (counter.Key().Flags() != DefaultSurfaceFlags()) {
surfacePathPrefix.AppendLiteral(", flags:");
surfacePathPrefix.AppendInt(uint32_t(counter.Key().Flags()),
/* aRadix = */ 16);
}
if (counter.Key().SVGContext()) {
const SVGImageContext& context = counter.Key().SVGContext().ref();
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 (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()) {
surfacePathPrefix.AppendLiteral(" fillOpa=");
surfacePathPrefix.AppendFloat(paint->GetFillOpacity());
}
if (paint->GetStroke()) {
surfacePathPrefix.AppendLiteral(" stroke=");
surfacePathPrefix.AppendInt(paint->GetStroke()->ToABGR(), 16);
}
if (paint->GetStrokeOpacity()) {
surfacePathPrefix.AppendLiteral(" strokeOpa=");
surfacePathPrefix.AppendFloat(paint->GetStrokeOpacity());
}
surfacePathPrefix.AppendLiteral(" ) ");
}
surfacePathPrefix.AppendLiteral("]");
}
} else if (counter.Type() == SurfaceMemoryCounterType::COMPOSITING) {
surfacePathPrefix.AppendLiteral(", compositing frame");
} else if (counter.Type() == SurfaceMemoryCounterType::COMPOSITING_PREV) {
surfacePathPrefix.AppendLiteral(", compositing prev frame");
} else {
MOZ_ASSERT_UNREACHABLE("Unknown counter type");
}
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());
}
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(EmptyCString(), path, aKind, UNITS_BYTES,
aValue, desc, aData);
}
static void RecordCounterForRequest(imgRequest* aRequest,
nsTArray<ImageMemoryCounter>* aArray,
bool aIsUsed)
{
RefPtr<image::Image> image = aRequest->GetImage();
if (!image) {
return;
}
SizeOfState state(ImagesMallocSizeOf);
ImageMemoryCounter counter(image, state, aIsUsed);
aArray->AppendElement(Move(counter));
}
};
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<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, ctxt, progress, progressMax);
}
NS_IMETHODIMP
nsProgressNotificationProxy::OnStatus(nsIRequest* request,
nsISupports* ctxt,
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, 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<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)
{
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* aTriggeringPrincipal,
nsContentPolicyType aPolicyType)
{
/* 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
* 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;
int16_t decision = nsIContentPolicy::REJECT_REQUEST;
rv = NS_CheckContentLoadPolicy(aPolicyType,
contentLocation,
aTriggeringPrincipal, // loading principal
aTriggeringPrincipal,
aLoadingContext,
EmptyCString(), //mime guess
nullptr, //aExtra
&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(aLoadingContext);
if (docShell) {
nsIDocument* document = docShell->GetDocument();
if (document && document->GetUpgradeInsecureRequests(false)) {
return false;
}
}
if (!nsContentUtils::IsSystemPrincipal(aTriggeringPrincipal)) {
// Set the requestingLocation from the aTriggeringPrincipal.
nsCOMPtr<nsIURI> requestingLocation;
if (aTriggeringPrincipal) {
rv = aTriggeringPrincipal->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,
aPolicyType,
contentLocation,
requestingLocation,
aLoadingContext,
EmptyCString(), //mime guess
nullptr,
aTriggeringPrincipal,
&decision);
if (NS_FAILED(rv) || !NS_CP_ACCEPTED(decision)) {
return false;
}
}
}
bool sendPriming = false;
bool mixedContentWouldBlock = false;
rv = nsMixedContentBlocker::GetHSTSPrimingFromRequestingContext(contentLocation,
aLoadingContext, &sendPriming, &mixedContentWouldBlock);
if (NS_FAILED(rv)) {
return false;
}
if (sendPriming && mixedContentWouldBlock) {
// if either of the securty checks above would cause a priming request, we
// can't load this image from the cache, so go ahead and return false here
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* triggeringPrincipal,
nsISupports* aCX, nsContentPolicyType aPolicyType,
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;
}
if (request->GetCORSMode() != imgIRequest::CORS_NONE ||
forcePrincipalCheck) {
nsCOMPtr<nsIPrincipal> otherprincipal = request->GetTriggeringPrincipal();
// If we previously had a principal, but we don't now, we can't use this
// request.
if (otherprincipal && !triggeringPrincipal) {
return false;
}
if (otherprincipal && triggeringPrincipal) {
bool equals = false;
otherprincipal->Equals(triggeringPrincipal, &equals);
if (!equals) {
return false;
}
}
}
// Content Policy Check on Cached Images
return ShouldLoadCachedImage(request, aCX, triggeringPrincipal, aPolicyType);
}
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,
int32_t aCORSMode,
nsIURI* aReferringURI,
ReferrerPolicy aReferrerPolicy,
nsILoadGroup* aLoadGroup,
const nsCString& aAcceptHeader,
nsLoadFlags aLoadFlags,
nsContentPolicyType aPolicyType,
nsIPrincipal* aTriggeringPrincipal,
nsISupports* aRequestingContext,
bool aRespectPrivacy)
{
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.
//
aLoadFlags |= nsIChannel::LOAD_CLASSIFY_URI;
nsCOMPtr<nsINode> requestingNode = do_QueryInterface(aRequestingContext);
nsSecurityFlags securityFlags =
aCORSMode == imgIRequest::CORS_NONE
? nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_DATA_INHERITS
: nsILoadInfo::SEC_REQUIRE_CORS_DATA_INHERITS;
if (aCORSMode == imgIRequest::CORS_ANONYMOUS) {
securityFlags |= nsILoadInfo::SEC_COOKIES_SAME_ORIGIN;
} else if (aCORSMode == imgIRequest::CORS_USE_CREDENTIALS) {
securityFlags |= nsILoadInfo::SEC_COOKIES_INCLUDE;
}
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 (requestingNode && aTriggeringPrincipal) {
rv = NS_NewChannelWithTriggeringPrincipal(aResult,
aURI,
requestingNode,
aTriggeringPrincipal,
securityFlags,
aPolicyType,
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)->GetLoadInfo();
if (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 prcoess in which case we can't get a requestingNode.
rv = NS_NewChannel(aResult,
aURI,
nsContentUtils::GetSystemPrincipal(),
securityFlags,
aPolicyType,
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)->GetLoadInfo();
if (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) {
rv = newHttpChannel->SetRequestHeader(NS_LITERAL_CSTRING("Accept"),
aAcceptHeader,
false);
MOZ_ASSERT(NS_SUCCEEDED(rv));
nsCOMPtr<nsIHttpChannelInternal> httpChannelInternal =
do_QueryInterface(newHttpChannel);
NS_ENSURE_TRUE(httpChannelInternal, NS_ERROR_UNEXPECTED);
rv = httpChannelInternal->SetDocumentURI(aInitialDocumentURI);
MOZ_ASSERT(NS_SUCCEEDED(rv));
rv = newHttpChannel->SetReferrerWithPolicy(aReferringURI, aReferrerPolicy);
MOZ_ASSERT(NS_SUCCEEDED(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
imgCacheEntry::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(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(mRequest->IsChrome(), 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().Spec());
} else {
LOG_FUNC_WITH_PARAM(gImgLog, "imgCacheEntry::SetHasNoProxies false",
"uri", mRequest->CacheKey().Spec());
}
}
mHasNoProxies = hasNoProxies;