gecko-dev/image/imgRequest.cpp
2017-01-08 22:04:19 -06:00

1307 lines
37 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "imgRequest.h"
#include "ImageLogging.h"
#include "imgLoader.h"
#include "imgRequestProxy.h"
#include "DecodePool.h"
#include "ProgressTracker.h"
#include "ImageFactory.h"
#include "Image.h"
#include "MultipartImage.h"
#include "RasterImage.h"
#include "nsIChannel.h"
#include "nsICacheInfoChannel.h"
#include "nsIDocument.h"
#include "nsIThreadRetargetableRequest.h"
#include "nsIInputStream.h"
#include "nsIMultiPartChannel.h"
#include "nsIHttpChannel.h"
#include "nsIApplicationCache.h"
#include "nsIApplicationCacheChannel.h"
#include "nsMimeTypes.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsISupportsPrimitives.h"
#include "nsIScriptSecurityManager.h"
#include "nsContentUtils.h"
#include "plstr.h" // PL_strcasestr(...)
#include "nsNetUtil.h"
#include "nsIProtocolHandler.h"
#include "imgIRequest.h"
using namespace mozilla;
using namespace mozilla::image;
#define LOG_TEST(level) (MOZ_LOG_TEST(gImgLog, (level)))
NS_IMPL_ISUPPORTS(imgRequest,
nsIStreamListener, nsIRequestObserver,
nsIThreadRetargetableStreamListener,
nsIChannelEventSink,
nsIInterfaceRequestor,
nsIAsyncVerifyRedirectCallback)
imgRequest::imgRequest(imgLoader* aLoader, const ImageCacheKey& aCacheKey)
: mLoader(aLoader)
, mCacheKey(aCacheKey)
, mLoadId(nullptr)
, mFirstProxy(nullptr)
, mValidator(nullptr)
, mInnerWindowId(0)
, mCORSMode(imgIRequest::CORS_NONE)
, mReferrerPolicy(mozilla::net::RP_Unset)
, mImageErrorCode(NS_OK)
, mMutex("imgRequest")
, mProgressTracker(new ProgressTracker())
, mIsMultiPartChannel(false)
, mGotData(false)
, mIsInCache(false)
, mDecodeRequested(false)
, mNewPartPending(false)
, mHadInsecureRedirect(false)
{ }
imgRequest::~imgRequest()
{
if (mLoader) {
mLoader->RemoveFromUncachedImages(this);
}
if (mURI) {
nsAutoCString spec;
mURI->GetSpec(spec);
LOG_FUNC_WITH_PARAM(gImgLog, "imgRequest::~imgRequest()",
"keyuri", spec.get());
} else
LOG_FUNC(gImgLog, "imgRequest::~imgRequest()");
}
nsresult
imgRequest::Init(nsIURI *aURI,
nsIURI *aCurrentURI,
bool aHadInsecureRedirect,
nsIRequest *aRequest,
nsIChannel *aChannel,
imgCacheEntry *aCacheEntry,
nsISupports* aCX,
nsIPrincipal* aLoadingPrincipal,
int32_t aCORSMode,
ReferrerPolicy aReferrerPolicy)
{
MOZ_ASSERT(NS_IsMainThread(), "Cannot use nsIURI off main thread!");
LOG_FUNC(gImgLog, "imgRequest::Init");
MOZ_ASSERT(!mImage, "Multiple calls to init");
MOZ_ASSERT(aURI, "No uri");
MOZ_ASSERT(aCurrentURI, "No current uri");
MOZ_ASSERT(aRequest, "No request");
MOZ_ASSERT(aChannel, "No channel");
mProperties = do_CreateInstance("@mozilla.org/properties;1");
// Use ImageURL to ensure access to URI data off main thread.
nsresult rv;
mURI = new ImageURL(aURI, rv);
NS_ENSURE_SUCCESS(rv, rv);
mCurrentURI = aCurrentURI;
mRequest = aRequest;
mChannel = aChannel;
mTimedChannel = do_QueryInterface(mChannel);
mLoadingPrincipal = aLoadingPrincipal;
mCORSMode = aCORSMode;
mReferrerPolicy = aReferrerPolicy;
// If the original URI and the current URI are different, check whether the
// original URI is secure. We deliberately don't take the current URI into
// account, as it needs to be handled using more complicated rules than
// earlier elements of the redirect chain.
if (aURI != aCurrentURI) {
bool isHttps = false;
bool isChrome = false;
bool schemeLocal = false;
if (NS_FAILED(aURI->SchemeIs("https", &isHttps)) ||
NS_FAILED(aURI->SchemeIs("chrome", &isChrome)) ||
NS_FAILED(NS_URIChainHasFlags(
aURI,
nsIProtocolHandler::URI_IS_LOCAL_RESOURCE , &schemeLocal)) ||
(!isHttps && !isChrome && !schemeLocal)) {
mHadInsecureRedirect = true;
}
}
// imgCacheValidator may have handled redirects before we were created, so we
// allow the caller to let us know if any redirects were insecure.
mHadInsecureRedirect = mHadInsecureRedirect || aHadInsecureRedirect;
mChannel->GetNotificationCallbacks(getter_AddRefs(mPrevChannelSink));
NS_ASSERTION(mPrevChannelSink != this,
"Initializing with a channel that already calls back to us!");
mChannel->SetNotificationCallbacks(this);
mCacheEntry = aCacheEntry;
mCacheEntry->UpdateLoadTime();
SetLoadId(aCX);
// Grab the inner window ID of the loading document, if possible.
nsCOMPtr<nsIDocument> doc = do_QueryInterface(aCX);
if (doc) {
mInnerWindowId = doc->InnerWindowID();
}
return NS_OK;
}
void
imgRequest::ClearLoader() {
mLoader = nullptr;
}
already_AddRefed<ProgressTracker>
imgRequest::GetProgressTracker() const
{
MutexAutoLock lock(mMutex);
if (mImage) {
MOZ_ASSERT(!mProgressTracker,
"Should have given mProgressTracker to mImage");
return mImage->GetProgressTracker();
} else {
MOZ_ASSERT(mProgressTracker,
"Should have mProgressTracker until we create mImage");
RefPtr<ProgressTracker> progressTracker = mProgressTracker;
MOZ_ASSERT(progressTracker);
return progressTracker.forget();
}
}
void imgRequest::SetCacheEntry(imgCacheEntry* entry)
{
mCacheEntry = entry;
}
bool
imgRequest::HasCacheEntry() const
{
return mCacheEntry != nullptr;
}
void
imgRequest::ResetCacheEntry()
{
if (HasCacheEntry()) {
mCacheEntry->SetDataSize(0);
}
}
void
imgRequest::AddProxy(imgRequestProxy* proxy)
{
NS_PRECONDITION(proxy, "null imgRequestProxy passed in");
LOG_SCOPE_WITH_PARAM(gImgLog, "imgRequest::AddProxy", "proxy", proxy);
if (!mFirstProxy) {
// Save a raw pointer to the first proxy we see, for use in the network
// priority logic.
mFirstProxy = proxy;
}
// If we're empty before adding, we have to tell the loader we now have
// proxies.
RefPtr<ProgressTracker> progressTracker = GetProgressTracker();
if (progressTracker->ObserverCount() == 0) {
MOZ_ASSERT(mURI, "Trying to SetHasProxies without key uri.");
if (mLoader) {
mLoader->SetHasProxies(this);
}
}
progressTracker->AddObserver(proxy);
}
nsresult
imgRequest::RemoveProxy(imgRequestProxy* proxy, nsresult aStatus)
{
LOG_SCOPE_WITH_PARAM(gImgLog, "imgRequest::RemoveProxy", "proxy", proxy);
// This will remove our animation consumers, so after removing
// this proxy, we don't end up without proxies with observers, but still
// have animation consumers.
proxy->ClearAnimationConsumers();
// Let the status tracker do its thing before we potentially call Cancel()
// below, because Cancel() may result in OnStopRequest being called back
// before Cancel() returns, leaving the image in a different state then the
// one it was in at this point.
RefPtr<ProgressTracker> progressTracker = GetProgressTracker();
if (!progressTracker->RemoveObserver(proxy)) {
return NS_OK;
}
if (progressTracker->ObserverCount() == 0) {
// If we have no observers, there's nothing holding us alive. If we haven't
// been cancelled and thus removed from the cache, tell the image loader so
// we can be evicted from the cache.
if (mCacheEntry) {
MOZ_ASSERT(mURI, "Removing last observer without key uri.");
if (mLoader) {
mLoader->SetHasNoProxies(this, mCacheEntry);
}
} else if (MOZ_LOG_TEST(gImgLog, LogLevel::Debug)) {
nsAutoCString spec;
mURI->GetSpec(spec);
LOG_MSG_WITH_PARAM(gImgLog,
"imgRequest::RemoveProxy no cache entry",
"uri", spec.get());
}
/* If |aStatus| is a failure code, then cancel the load if it is still in
progress. Otherwise, let the load continue, keeping 'this' in the cache
with no observers. This way, if a proxy is destroyed without calling
cancel on it, it won't leak and won't leave a bad pointer in the observer
list.
*/
if (!(progressTracker->GetProgress() & FLAG_LAST_PART_COMPLETE) &&
NS_FAILED(aStatus)) {
LOG_MSG(gImgLog, "imgRequest::RemoveProxy",
"load in progress. canceling");
this->Cancel(NS_BINDING_ABORTED);
}
/* break the cycle from the cache entry. */
mCacheEntry = nullptr;
}
// If a proxy is removed for a reason other than its owner being
// changed, remove the proxy from the loadgroup.
if (aStatus != NS_IMAGELIB_CHANGING_OWNER) {
proxy->RemoveFromLoadGroup(true);
}
return NS_OK;
}
void
imgRequest::CancelAndAbort(nsresult aStatus)
{
LOG_SCOPE(gImgLog, "imgRequest::CancelAndAbort");
Cancel(aStatus);
// It's possible for the channel to fail to open after we've set our
// notification callbacks. In that case, make sure to break the cycle between
// the channel and us, because it won't.
if (mChannel) {
mChannel->SetNotificationCallbacks(mPrevChannelSink);
mPrevChannelSink = nullptr;
}
}
class imgRequestMainThreadCancel : public Runnable
{
public:
imgRequestMainThreadCancel(imgRequest* aImgRequest, nsresult aStatus)
: mImgRequest(aImgRequest)
, mStatus(aStatus)
{
MOZ_ASSERT(!NS_IsMainThread(), "Create me off main thread only!");
MOZ_ASSERT(aImgRequest);
}
NS_IMETHOD Run() override
{
MOZ_ASSERT(NS_IsMainThread(), "I should be running on the main thread!");
mImgRequest->ContinueCancel(mStatus);
return NS_OK;
}
private:
RefPtr<imgRequest> mImgRequest;
nsresult mStatus;
};
void
imgRequest::Cancel(nsresult aStatus)
{
/* The Cancel() method here should only be called by this class. */
LOG_SCOPE(gImgLog, "imgRequest::Cancel");
if (NS_IsMainThread()) {
ContinueCancel(aStatus);
} else {
NS_DispatchToMainThread(new imgRequestMainThreadCancel(this, aStatus));
}
}
void
imgRequest::ContinueCancel(nsresult aStatus)
{
MOZ_ASSERT(NS_IsMainThread());
RefPtr<ProgressTracker> progressTracker = GetProgressTracker();
progressTracker->SyncNotifyProgress(FLAG_HAS_ERROR | FLAG_ONLOAD_UNBLOCKED);
RemoveFromCache();
if (mRequest && !(progressTracker->GetProgress() & FLAG_LAST_PART_COMPLETE)) {
mRequest->Cancel(aStatus);
}
}
class imgRequestMainThreadEvict : public Runnable
{
public:
explicit imgRequestMainThreadEvict(imgRequest* aImgRequest)
: mImgRequest(aImgRequest)
{
MOZ_ASSERT(!NS_IsMainThread(), "Create me off main thread only!");
MOZ_ASSERT(aImgRequest);
}
NS_IMETHOD Run() override
{
MOZ_ASSERT(NS_IsMainThread(), "I should be running on the main thread!");
mImgRequest->ContinueEvict();
return NS_OK;
}
private:
RefPtr<imgRequest> mImgRequest;
};
// EvictFromCache() is written to allowed to get called from any thread
void
imgRequest::EvictFromCache()
{
/* The EvictFromCache() method here should only be called by this class. */
LOG_SCOPE(gImgLog, "imgRequest::EvictFromCache");
if (NS_IsMainThread()) {
ContinueEvict();
} else {
NS_DispatchToMainThread(new imgRequestMainThreadEvict(this));
}
}
// Helper-method used by EvictFromCache()
void
imgRequest::ContinueEvict()
{
MOZ_ASSERT(NS_IsMainThread());
RemoveFromCache();
}
void
imgRequest::StartDecoding()
{
MutexAutoLock lock(mMutex);
mDecodeRequested = true;
}
bool
imgRequest::IsDecodeRequested() const
{
MutexAutoLock lock(mMutex);
return mDecodeRequested;
}
nsresult imgRequest::GetURI(ImageURL** aURI)
{
MOZ_ASSERT(aURI);
LOG_FUNC(gImgLog, "imgRequest::GetURI");
if (mURI) {
*aURI = mURI;
NS_ADDREF(*aURI);
return NS_OK;
}
return NS_ERROR_FAILURE;
}
nsresult
imgRequest::GetCurrentURI(nsIURI** aURI)
{
MOZ_ASSERT(aURI);
LOG_FUNC(gImgLog, "imgRequest::GetCurrentURI");
if (mCurrentURI) {
*aURI = mCurrentURI;
NS_ADDREF(*aURI);
return NS_OK;
}
return NS_ERROR_FAILURE;
}
bool
imgRequest::IsChrome() const
{
bool isChrome = false;
if (NS_WARN_IF(NS_FAILED(mURI->SchemeIs("chrome", &isChrome)))) {
return false;
}
return isChrome;
}
nsresult
imgRequest::GetImageErrorCode()
{
return mImageErrorCode;
}
nsresult
imgRequest::GetSecurityInfo(nsISupports** aSecurityInfo)
{
LOG_FUNC(gImgLog, "imgRequest::GetSecurityInfo");
// Missing security info means this is not a security load
// i.e. it is not an error when security info is missing
NS_IF_ADDREF(*aSecurityInfo = mSecurityInfo);
return NS_OK;
}
void
imgRequest::RemoveFromCache()
{
LOG_SCOPE(gImgLog, "imgRequest::RemoveFromCache");
bool isInCache = false;
{
MutexAutoLock lock(mMutex);
isInCache = mIsInCache;
}
if (isInCache && mLoader) {
// mCacheEntry is nulled out when we have no more observers.
if (mCacheEntry) {
mLoader->RemoveFromCache(mCacheEntry);
} else {
mLoader->RemoveFromCache(mCacheKey);
}
}
mCacheEntry = nullptr;
}
bool
imgRequest::HasConsumers() const
{
RefPtr<ProgressTracker> progressTracker = GetProgressTracker();
return progressTracker && progressTracker->ObserverCount() > 0;
}
already_AddRefed<Image>
imgRequest::GetImage() const
{
MutexAutoLock lock(mMutex);
RefPtr<Image> image = mImage;
return image.forget();
}
int32_t imgRequest::Priority() const
{
int32_t priority = nsISupportsPriority::PRIORITY_NORMAL;
nsCOMPtr<nsISupportsPriority> p = do_QueryInterface(mRequest);
if (p) {
p->GetPriority(&priority);
}
return priority;
}
void
imgRequest::AdjustPriority(imgRequestProxy* proxy, int32_t delta)
{
// only the first proxy is allowed to modify the priority of this image load.
//
// XXX(darin): this is probably not the most optimal algorithm as we may want
// to increase the priority of requests that have a lot of proxies. the key
// concern though is that image loads remain lower priority than other pieces
// of content such as link clicks, CSS, and JS.
//
if (!mFirstProxy || proxy != mFirstProxy) {
return;
}
nsCOMPtr<nsISupportsPriority> p = do_QueryInterface(mChannel);
if (p) {
p->AdjustPriority(delta);
}
}
bool
imgRequest::HasTransferredData() const
{
MutexAutoLock lock(mMutex);
return mGotData;
}
void
imgRequest::SetIsInCache(bool aInCache)
{
LOG_FUNC_WITH_PARAM(gImgLog,
"imgRequest::SetIsCacheable", "aInCache", aInCache);
MutexAutoLock lock(mMutex);
mIsInCache = aInCache;
}
void
imgRequest::UpdateCacheEntrySize()
{
if (!mCacheEntry) {
return;
}
RefPtr<Image> image = GetImage();
size_t size = image->SizeOfSourceWithComputedFallback(moz_malloc_size_of);
mCacheEntry->SetDataSize(size);
}
void
imgRequest::SetCacheValidation(imgCacheEntry* aCacheEntry, nsIRequest* aRequest)
{
/* get the expires info */
if (aCacheEntry) {
nsCOMPtr<nsICacheInfoChannel> cacheChannel(do_QueryInterface(aRequest));
if (cacheChannel) {
uint32_t expiration = 0;
/* get the expiration time from the caching channel's token */
if (NS_SUCCEEDED(cacheChannel->GetCacheTokenExpirationTime(&expiration))) {
// Expiration time defaults to 0. We set the expiration time on our
// entry if it hasn't been set yet.
if (aCacheEntry->GetExpiryTime() == 0) {
aCacheEntry->SetExpiryTime(expiration);
}
}
}
// Determine whether the cache entry must be revalidated when we try to use
// it. Currently, only HTTP specifies this information...
nsCOMPtr<nsIHttpChannel> httpChannel(do_QueryInterface(aRequest));
if (httpChannel) {
bool bMustRevalidate = false;
httpChannel->IsNoStoreResponse(&bMustRevalidate);
if (!bMustRevalidate) {
httpChannel->IsNoCacheResponse(&bMustRevalidate);
}
if (!bMustRevalidate) {
nsAutoCString cacheHeader;
httpChannel->GetResponseHeader(NS_LITERAL_CSTRING("Cache-Control"),
cacheHeader);
if (PL_strcasestr(cacheHeader.get(), "must-revalidate")) {
bMustRevalidate = true;
}
}
// Cache entries default to not needing to validate. We ensure that
// multiple calls to this function don't override an earlier decision to
// validate by making validation a one-way decision.
if (bMustRevalidate) {
aCacheEntry->SetMustValidate(bMustRevalidate);
}
}
}
}
namespace {
already_AddRefed<nsIApplicationCache>
GetApplicationCache(nsIRequest* aRequest)
{
nsresult rv;
nsCOMPtr<nsIApplicationCacheChannel> appCacheChan =
do_QueryInterface(aRequest);
if (!appCacheChan) {
return nullptr;
}
bool fromAppCache;
rv = appCacheChan->GetLoadedFromApplicationCache(&fromAppCache);
NS_ENSURE_SUCCESS(rv, nullptr);
if (!fromAppCache) {
return nullptr;
}
nsCOMPtr<nsIApplicationCache> appCache;
rv = appCacheChan->GetApplicationCache(getter_AddRefs(appCache));
NS_ENSURE_SUCCESS(rv, nullptr);
return appCache.forget();
}
} // namespace
bool
imgRequest::CacheChanged(nsIRequest* aNewRequest)
{
nsCOMPtr<nsIApplicationCache> newAppCache = GetApplicationCache(aNewRequest);
// Application cache not involved at all or the same app cache involved
// in both of the loads (original and new).
if (newAppCache == mApplicationCache) {
return false;
}
// In a rare case it may happen that two objects still refer
// the same application cache version.
if (newAppCache && mApplicationCache) {
nsresult rv;
nsAutoCString oldAppCacheClientId, newAppCacheClientId;
rv = mApplicationCache->GetClientID(oldAppCacheClientId);
NS_ENSURE_SUCCESS(rv, true);
rv = newAppCache->GetClientID(newAppCacheClientId);
NS_ENSURE_SUCCESS(rv, true);
if (oldAppCacheClientId == newAppCacheClientId) {
return false;
}
}
// When we get here, app caches differ or app cache is involved
// just in one of the loads what we also consider as a change
// in a loading cache.
return true;
}
bool
imgRequest::GetMultipart() const
{
MutexAutoLock lock(mMutex);
return mIsMultiPartChannel;
}
bool
imgRequest::HadInsecureRedirect() const
{
MutexAutoLock lock(mMutex);
return mHadInsecureRedirect;
}
/** nsIRequestObserver methods **/
NS_IMETHODIMP
imgRequest::OnStartRequest(nsIRequest* aRequest, nsISupports* ctxt)
{
LOG_SCOPE(gImgLog, "imgRequest::OnStartRequest");
RefPtr<Image> image;
// Figure out if we're multipart.
nsCOMPtr<nsIMultiPartChannel> multiPartChannel = do_QueryInterface(aRequest);
MOZ_ASSERT(multiPartChannel || !mIsMultiPartChannel,
"Stopped being multipart?"); {
MutexAutoLock lock(mMutex);
mNewPartPending = true;
image = mImage;
mIsMultiPartChannel = bool(multiPartChannel);
}
// If we're not multipart, we shouldn't have an image yet.
if (image && !multiPartChannel) {
MOZ_ASSERT_UNREACHABLE("Already have an image for a non-multipart request");
Cancel(NS_IMAGELIB_ERROR_FAILURE);
return NS_ERROR_FAILURE;
}
/*
* If mRequest is null here, then we need to set it so that we'll be able to
* cancel it if our Cancel() method is called. Note that this can only
* happen for multipart channels. We could simply not null out mRequest for
* non-last parts, if GetIsLastPart() were reliable, but it's not. See
* https://bugzilla.mozilla.org/show_bug.cgi?id=339610
*/
if (!mRequest) {
MOZ_ASSERT(multiPartChannel, "Should have mRequest unless we're multipart");
nsCOMPtr<nsIChannel> baseChannel;
multiPartChannel->GetBaseChannel(getter_AddRefs(baseChannel));
mRequest = baseChannel;
}
nsCOMPtr<nsIChannel> channel(do_QueryInterface(aRequest));
if (channel) {
channel->GetSecurityInfo(getter_AddRefs(mSecurityInfo));
/* Get our principal */
nsCOMPtr<nsIScriptSecurityManager>
secMan = nsContentUtils::GetSecurityManager();
if (secMan) {
nsresult rv =
secMan->GetChannelResultPrincipal(channel, getter_AddRefs(mPrincipal));
if (NS_FAILED(rv)) {
return rv;
}
}
}
SetCacheValidation(mCacheEntry, aRequest);
mApplicationCache = GetApplicationCache(aRequest);
// Shouldn't we be dead already if this gets hit?
// Probably multipart/x-mixed-replace...
RefPtr<ProgressTracker> progressTracker = GetProgressTracker();
if (progressTracker->ObserverCount() == 0) {
this->Cancel(NS_IMAGELIB_ERROR_FAILURE);
}
// Try to retarget OnDataAvailable to a decode thread.
nsCOMPtr<nsIHttpChannel> httpChannel = do_QueryInterface(aRequest);
nsCOMPtr<nsIThreadRetargetableRequest> retargetable =
do_QueryInterface(aRequest);
if (httpChannel && retargetable) {
nsAutoCString mimeType;
nsresult rv = httpChannel->GetContentType(mimeType);
if (NS_SUCCEEDED(rv) && !mimeType.EqualsLiteral(IMAGE_SVG_XML)) {
// Retarget OnDataAvailable to the DecodePool's IO thread.
nsCOMPtr<nsIEventTarget> target =
DecodePool::Singleton()->GetIOEventTarget();
rv = retargetable->RetargetDeliveryTo(target);
}
MOZ_LOG(gImgLog, LogLevel::Warning,
("[this=%p] imgRequest::OnStartRequest -- "
"RetargetDeliveryTo rv %d=%s\n",
this, rv, NS_SUCCEEDED(rv) ? "succeeded" : "failed"));
}
return NS_OK;
}
NS_IMETHODIMP
imgRequest::OnStopRequest(nsIRequest* aRequest,
nsISupports* ctxt, nsresult status)
{
LOG_FUNC(gImgLog, "imgRequest::OnStopRequest");
MOZ_ASSERT(NS_IsMainThread(), "Can't send notifications off-main-thread");
RefPtr<Image> image = GetImage();
RefPtr<imgRequest> strongThis = this;
if (mIsMultiPartChannel && mNewPartPending) {
OnDataAvailable(aRequest, ctxt, nullptr, 0, 0);
}
// XXXldb What if this is a non-last part of a multipart request?
// xxx before we release our reference to mRequest, lets
// save the last status that we saw so that the
// imgRequestProxy will have access to it.
if (mRequest) {
mRequest = nullptr; // we no longer need the request
}
// stop holding a ref to the channel, since we don't need it anymore
if (mChannel) {
mChannel->SetNotificationCallbacks(mPrevChannelSink);
mPrevChannelSink = nullptr;
mChannel = nullptr;
}
bool lastPart = true;
nsCOMPtr<nsIMultiPartChannel> mpchan(do_QueryInterface(aRequest));
if (mpchan) {
mpchan->GetIsLastPart(&lastPart);
}
bool isPartial = false;
if (image && (status == NS_ERROR_NET_PARTIAL_TRANSFER)) {
isPartial = true;
status = NS_OK; // fake happy face
}
// Tell the image that it has all of the source data. Note that this can
// trigger a failure, since the image might be waiting for more non-optional
// data and this is the point where we break the news that it's not coming.
if (image) {
nsresult rv = image->OnImageDataComplete(aRequest, ctxt, status, lastPart);
// If we got an error in the OnImageDataComplete() call, we don't want to
// proceed as if nothing bad happened. However, we also want to give
// precedence to failure status codes from necko, since presumably they're
// more meaningful.
if (NS_FAILED(rv) && NS_SUCCEEDED(status)) {
status = rv;
}
}
// If the request went through, update the cache entry size. Otherwise,
// cancel the request, which removes us from the cache.
if (image && NS_SUCCEEDED(status) && !isPartial) {
// We update the cache entry size here because this is where we finish
// loading compressed source data, which is part of our size calculus.
UpdateCacheEntrySize();
} else if (isPartial) {
// Remove the partial image from the cache.
this->EvictFromCache();
} else {
mImageErrorCode = status;
// if the error isn't "just" a partial transfer
// stops animations, removes from cache
this->Cancel(status);
}
if (!image) {
// We have to fire the OnStopRequest notifications ourselves because there's
// no image capable of doing so.
Progress progress =
LoadCompleteProgress(lastPart, /* aError = */ false, status);
RefPtr<ProgressTracker> progressTracker = GetProgressTracker();
progressTracker->SyncNotifyProgress(progress);
}
mTimedChannel = nullptr;
return NS_OK;
}
struct mimetype_closure
{
nsACString* newType;
};
/* prototype for these defined below */
static nsresult
sniff_mimetype_callback(nsIInputStream* in, void* closure,
const char* fromRawSegment, uint32_t toOffset,
uint32_t count, uint32_t* writeCount);
/** nsThreadRetargetableStreamListener methods **/
NS_IMETHODIMP
imgRequest::CheckListenerChain()
{
// TODO Might need more checking here.
NS_ASSERTION(NS_IsMainThread(), "Should be on the main thread!");
return NS_OK;
}
/** nsIStreamListener methods **/
struct NewPartResult final
{
explicit NewPartResult(Image* aExistingImage)
: mImage(aExistingImage)
, mIsFirstPart(!aExistingImage)
, mSucceeded(false)
, mShouldResetCacheEntry(false)
{ }
nsAutoCString mContentType;
nsAutoCString mContentDisposition;
RefPtr<Image> mImage;
const bool mIsFirstPart;
bool mSucceeded;
bool mShouldResetCacheEntry;
};
static NewPartResult
PrepareForNewPart(nsIRequest* aRequest, nsIInputStream* aInStr, uint32_t aCount,
ImageURL* aURI, bool aIsMultipart, Image* aExistingImage,
ProgressTracker* aProgressTracker, uint32_t aInnerWindowId)
{
NewPartResult result(aExistingImage);
if (aInStr) {
mimetype_closure closure;
closure.newType = &result.mContentType;
// Look at the first few bytes and see if we can tell what the data is from
// that since servers tend to lie. :(
uint32_t out;
aInStr->ReadSegments(sniff_mimetype_callback, &closure, aCount, &out);
}
nsCOMPtr<nsIChannel> chan(do_QueryInterface(aRequest));
if (result.mContentType.IsEmpty()) {
nsresult rv = chan ? chan->GetContentType(result.mContentType)
: NS_ERROR_FAILURE;
if (NS_FAILED(rv)) {
MOZ_LOG(gImgLog,
LogLevel::Error, ("imgRequest::PrepareForNewPart -- "
"Content type unavailable from the channel\n"));
if (!aIsMultipart) {
return result;
}
}
}
if (chan) {
chan->GetContentDispositionHeader(result.mContentDisposition);
}
MOZ_LOG(gImgLog, LogLevel::Debug,
("imgRequest::PrepareForNewPart -- Got content type %s\n",
result.mContentType.get()));
// XXX If server lied about mimetype and it's SVG, we may need to copy
// the data and dispatch back to the main thread, AND tell the channel to
// dispatch there in the future.
// Create the new image and give it ownership of our ProgressTracker.
if (aIsMultipart) {
// Create the ProgressTracker and image for this part.
RefPtr<ProgressTracker> progressTracker = new ProgressTracker();
RefPtr<Image> partImage =
ImageFactory::CreateImage(aRequest, progressTracker, result.mContentType,
aURI, /* aIsMultipart = */ true,
aInnerWindowId);
if (result.mIsFirstPart) {
// First part for a multipart channel. Create the MultipartImage wrapper.
MOZ_ASSERT(aProgressTracker, "Shouldn't have given away tracker yet");
aProgressTracker->SetIsMultipart();
result.mImage =
ImageFactory::CreateMultipartImage(partImage, aProgressTracker);
} else {
// Transition to the new part.
auto multipartImage = static_cast<MultipartImage*>(aExistingImage);
multipartImage->BeginTransitionToPart(partImage);
// Reset our cache entry size so it doesn't keep growing without bound.
result.mShouldResetCacheEntry = true;
}
} else {
MOZ_ASSERT(!aExistingImage, "New part for non-multipart channel?");
MOZ_ASSERT(aProgressTracker, "Shouldn't have given away tracker yet");
// Create an image using our progress tracker.
result.mImage =
ImageFactory::CreateImage(aRequest, aProgressTracker, result.mContentType,
aURI, /* aIsMultipart = */ false,
aInnerWindowId);
}
MOZ_ASSERT(result.mImage);
if (!result.mImage->HasError() || aIsMultipart) {
// We allow multipart images to fail to initialize (which generally
// indicates a bad content type) without cancelling the load, because
// subsequent parts might be fine.
result.mSucceeded = true;
}
return result;
}
class FinishPreparingForNewPartRunnable final : public Runnable
{
public:
FinishPreparingForNewPartRunnable(imgRequest* aImgRequest,
NewPartResult&& aResult)
: mImgRequest(aImgRequest)
, mResult(aResult)
{
MOZ_ASSERT(aImgRequest);
}
NS_IMETHOD Run() override
{
mImgRequest->FinishPreparingForNewPart(mResult);
return NS_OK;
}
private:
RefPtr<imgRequest> mImgRequest;
NewPartResult mResult;
};
void
imgRequest::FinishPreparingForNewPart(const NewPartResult& aResult)
{
MOZ_ASSERT(NS_IsMainThread());
mContentType = aResult.mContentType;
SetProperties(aResult.mContentType, aResult.mContentDisposition);
if (aResult.mIsFirstPart) {
// Notify listeners that we have an image.
RefPtr<ProgressTracker> progressTracker = GetProgressTracker();
progressTracker->OnImageAvailable();
MOZ_ASSERT(progressTracker->HasImage());
}
if (aResult.mShouldResetCacheEntry) {
ResetCacheEntry();
}
if (IsDecodeRequested()) {
aResult.mImage->StartDecoding(imgIContainer::FLAG_NONE);
}
}
NS_IMETHODIMP
imgRequest::OnDataAvailable(nsIRequest* aRequest, nsISupports* aContext,
nsIInputStream* aInStr, uint64_t aOffset,
uint32_t aCount)
{
LOG_SCOPE_WITH_PARAM(gImgLog, "imgRequest::OnDataAvailable",
"count", aCount);
NS_ASSERTION(aRequest, "imgRequest::OnDataAvailable -- no request!");
RefPtr<Image> image;
RefPtr<ProgressTracker> progressTracker;
bool isMultipart = false;
bool newPartPending = false;
// Retrieve and update our state.
{
MutexAutoLock lock(mMutex);
mGotData = true;
image = mImage;
progressTracker = mProgressTracker;
isMultipart = mIsMultiPartChannel;
newPartPending = mNewPartPending;
mNewPartPending = false;
}
// If this is a new part, we need to sniff its content type and create an
// appropriate image.
if (newPartPending) {
NewPartResult result = PrepareForNewPart(aRequest, aInStr, aCount, mURI,
isMultipart, image,
progressTracker, mInnerWindowId);
bool succeeded = result.mSucceeded;
if (result.mImage) {
image = result.mImage;
// Update our state to reflect this new part.
{
MutexAutoLock lock(mMutex);
mImage = image;
mProgressTracker = nullptr;
}
// Some property objects are not threadsafe, and we need to send
// OnImageAvailable on the main thread, so finish on the main thread.
if (NS_IsMainThread()) {
FinishPreparingForNewPart(result);
} else {
nsCOMPtr<nsIRunnable> runnable =
new FinishPreparingForNewPartRunnable(this, Move(result));
NS_DispatchToMainThread(runnable);
}
}
if (!succeeded) {
// Something went wrong; probably a content type issue.
Cancel(NS_IMAGELIB_ERROR_FAILURE);
return NS_BINDING_ABORTED;
}
}
// Notify the image that it has new data.
if (aInStr) {
nsresult rv =
image->OnImageDataAvailable(aRequest, aContext, aInStr, aOffset, aCount);
if (NS_FAILED(rv)) {
MOZ_LOG(gImgLog, LogLevel::Warning,
("[this=%p] imgRequest::OnDataAvailable -- "
"copy to RasterImage failed\n", this));
Cancel(NS_IMAGELIB_ERROR_FAILURE);
return NS_BINDING_ABORTED;
}
}
return NS_OK;
}
void
imgRequest::SetProperties(const nsACString& aContentType,
const nsACString& aContentDisposition)
{
/* set our mimetype as a property */
nsCOMPtr<nsISupportsCString> contentType =
do_CreateInstance("@mozilla.org/supports-cstring;1");
if (contentType) {
contentType->SetData(aContentType);
mProperties->Set("type", contentType);
}
/* set our content disposition as a property */
if (!aContentDisposition.IsEmpty()) {
nsCOMPtr<nsISupportsCString> contentDisposition =
do_CreateInstance("@mozilla.org/supports-cstring;1");
if (contentDisposition) {
contentDisposition->SetData(aContentDisposition);
mProperties->Set("content-disposition", contentDisposition);
}
}
}
static nsresult
sniff_mimetype_callback(nsIInputStream* in,
void* data,
const char* fromRawSegment,
uint32_t toOffset,
uint32_t count,
uint32_t* writeCount)
{
mimetype_closure* closure = static_cast<mimetype_closure*>(data);
NS_ASSERTION(closure, "closure is null!");
if (count > 0) {
imgLoader::GetMimeTypeFromContent(fromRawSegment, count, *closure->newType);
}
*writeCount = 0;
return NS_ERROR_FAILURE;
}
/** nsIInterfaceRequestor methods **/
NS_IMETHODIMP
imgRequest::GetInterface(const nsIID & aIID, void** aResult)
{
if (!mPrevChannelSink || aIID.Equals(NS_GET_IID(nsIChannelEventSink))) {
return QueryInterface(aIID, aResult);
}
NS_ASSERTION(mPrevChannelSink != this,
"Infinite recursion - don't keep track of channel sinks that are us!");
return mPrevChannelSink->GetInterface(aIID, aResult);
}
/** nsIChannelEventSink methods **/
NS_IMETHODIMP
imgRequest::AsyncOnChannelRedirect(nsIChannel* oldChannel,
nsIChannel* newChannel, uint32_t flags,
nsIAsyncVerifyRedirectCallback* callback)
{
NS_ASSERTION(mRequest && mChannel,
"Got a channel redirect after we nulled out mRequest!");
NS_ASSERTION(mChannel == oldChannel,
"Got a channel redirect for an unknown channel!");
NS_ASSERTION(newChannel, "Got a redirect to a NULL channel!");
SetCacheValidation(mCacheEntry, oldChannel);
// Prepare for callback
mRedirectCallback = callback;
mNewRedirectChannel = newChannel;
nsCOMPtr<nsIChannelEventSink> sink(do_GetInterface(mPrevChannelSink));
if (sink) {
nsresult rv = sink->AsyncOnChannelRedirect(oldChannel, newChannel, flags,
this);
if (NS_FAILED(rv)) {
mRedirectCallback = nullptr;
mNewRedirectChannel = nullptr;
}
return rv;
}
(void) OnRedirectVerifyCallback(NS_OK);
return NS_OK;
}
NS_IMETHODIMP
imgRequest::OnRedirectVerifyCallback(nsresult result)
{
NS_ASSERTION(mRedirectCallback, "mRedirectCallback not set in callback");
NS_ASSERTION(mNewRedirectChannel, "mNewRedirectChannel not set in callback");
if (NS_FAILED(result)) {
mRedirectCallback->OnRedirectVerifyCallback(result);
mRedirectCallback = nullptr;
mNewRedirectChannel = nullptr;
return NS_OK;
}
mChannel = mNewRedirectChannel;
mTimedChannel = do_QueryInterface(mChannel);
mNewRedirectChannel = nullptr;
if (LOG_TEST(LogLevel::Debug)) {
LOG_MSG_WITH_PARAM(gImgLog,
"imgRequest::OnChannelRedirect", "old",
mCurrentURI ? mCurrentURI->GetSpecOrDefault().get()
: "");
}
// 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.
bool isHttps = false;
bool isChrome = false;
bool schemeLocal = false;
if (NS_FAILED(mCurrentURI->SchemeIs("https", &isHttps)) ||
NS_FAILED(mCurrentURI->SchemeIs("chrome", &isChrome)) ||
NS_FAILED(NS_URIChainHasFlags(mCurrentURI,
nsIProtocolHandler::URI_IS_LOCAL_RESOURCE,
&schemeLocal)) ||
(!isHttps && !isChrome && !schemeLocal)) {
MutexAutoLock lock(mMutex);
// The csp directive upgrade-insecure-requests performs an internal redirect
// to upgrade all requests from http to https before any data is fetched from
// the network. Do not pollute mHadInsecureRedirect in case of such an internal
// redirect.
nsCOMPtr<nsILoadInfo> loadInfo = mChannel->GetLoadInfo();
bool upgradeInsecureRequests = loadInfo ? loadInfo->GetUpgradeInsecureRequests()
: false;
if (!upgradeInsecureRequests) {
mHadInsecureRedirect = true;
}
}
// Update the current URI.
mChannel->GetURI(getter_AddRefs(mCurrentURI));
if (LOG_TEST(LogLevel::Debug)) {
LOG_MSG_WITH_PARAM(gImgLog, "imgRequest::OnChannelRedirect", "new",
mCurrentURI ? mCurrentURI->GetSpecOrDefault().get()
: "");
}
// Make sure we have a protocol that returns data rather than opens an
// external application, e.g. 'mailto:'.
bool doesNotReturnData = false;
nsresult rv =
NS_URIChainHasFlags(mCurrentURI,
nsIProtocolHandler::URI_DOES_NOT_RETURN_DATA,
&doesNotReturnData);
if (NS_SUCCEEDED(rv) && doesNotReturnData) {
rv = NS_ERROR_ABORT;
}
if (NS_FAILED(rv)) {
mRedirectCallback->OnRedirectVerifyCallback(rv);
mRedirectCallback = nullptr;
return NS_OK;
}
mRedirectCallback->OnRedirectVerifyCallback(NS_OK);
mRedirectCallback = nullptr;
return NS_OK;
}