gecko-dev/dom/base/nsSyncLoadService.cpp

395 строки
12 KiB
C++

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* 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/. */
/*
* A service that provides methods for synchronously loading a DOM in various ways.
*/
#include "nsSyncLoadService.h"
#include "nsCOMPtr.h"
#include "nsIChannel.h"
#include "nsIChannelEventSink.h"
#include "nsIAsyncVerifyRedirectCallback.h"
#include "nsIInterfaceRequestor.h"
#include "nsIStreamListener.h"
#include "nsIURI.h"
#include "nsString.h"
#include "nsWeakReference.h"
#include "nsIDocument.h"
#include "nsIDOMDocument.h"
#include "nsIPrincipal.h"
#include "nsContentUtils.h" // for kLoadAsData
#include "nsThreadUtils.h"
#include "nsNetUtil.h"
#include "nsStreamUtils.h"
#include <algorithm>
using mozilla::net::ReferrerPolicy;
/**
* This class manages loading a single XML document
*/
class nsSyncLoader : public nsIStreamListener,
public nsIChannelEventSink,
public nsIInterfaceRequestor,
public nsSupportsWeakReference
{
public:
nsSyncLoader() : mLoading(false) {}
NS_DECL_ISUPPORTS
nsresult LoadDocument(nsIChannel* aChannel,
bool aChannelIsSync, bool aForceToXML,
ReferrerPolicy aReferrerPolicy,
nsIDOMDocument** aResult);
NS_FORWARD_NSISTREAMLISTENER(mListener->)
NS_DECL_NSIREQUESTOBSERVER
NS_DECL_NSICHANNELEVENTSINK
NS_DECL_NSIINTERFACEREQUESTOR
private:
virtual ~nsSyncLoader();
nsresult PushAsyncStream(nsIStreamListener* aListener);
nsresult PushSyncStream(nsIStreamListener* aListener);
nsCOMPtr<nsIChannel> mChannel;
nsCOMPtr<nsIStreamListener> mListener;
bool mLoading;
nsresult mAsyncLoadStatus;
};
class nsForceXMLListener : public nsIStreamListener
{
virtual ~nsForceXMLListener();
public:
explicit nsForceXMLListener(nsIStreamListener* aListener);
NS_DECL_ISUPPORTS
NS_FORWARD_NSISTREAMLISTENER(mListener->)
NS_DECL_NSIREQUESTOBSERVER
private:
nsCOMPtr<nsIStreamListener> mListener;
};
nsForceXMLListener::nsForceXMLListener(nsIStreamListener* aListener)
: mListener(aListener)
{
}
nsForceXMLListener::~nsForceXMLListener()
{
}
NS_IMPL_ISUPPORTS(nsForceXMLListener,
nsIStreamListener,
nsIRequestObserver)
NS_IMETHODIMP
nsForceXMLListener::OnStartRequest(nsIRequest *aRequest, nsISupports *aContext)
{
nsresult status;
aRequest->GetStatus(&status);
nsCOMPtr<nsIChannel> channel = do_QueryInterface(aRequest);
if (channel && NS_SUCCEEDED(status)) {
channel->SetContentType(NS_LITERAL_CSTRING("text/xml"));
}
return mListener->OnStartRequest(aRequest, aContext);
}
NS_IMETHODIMP
nsForceXMLListener::OnStopRequest(nsIRequest *aRequest, nsISupports *aContext,
nsresult aStatusCode)
{
return mListener->OnStopRequest(aRequest, aContext, aStatusCode);
}
nsSyncLoader::~nsSyncLoader()
{
if (mLoading && mChannel) {
mChannel->Cancel(NS_BINDING_ABORTED);
}
}
NS_IMPL_ISUPPORTS(nsSyncLoader,
nsIStreamListener,
nsIRequestObserver,
nsIChannelEventSink,
nsIInterfaceRequestor,
nsISupportsWeakReference)
nsresult
nsSyncLoader::LoadDocument(nsIChannel* aChannel,
bool aChannelIsSync,
bool aForceToXML,
ReferrerPolicy aReferrerPolicy,
nsIDOMDocument **aResult)
{
NS_ENSURE_ARG(aChannel);
NS_ENSURE_ARG_POINTER(aResult);
*aResult = nullptr;
nsresult rv = NS_OK;
mChannel = aChannel;
nsCOMPtr<nsIHttpChannel> http = do_QueryInterface(mChannel);
if (http) {
http->SetRequestHeader(NS_LITERAL_CSTRING("Accept"),
NS_LITERAL_CSTRING("text/xml,application/xml,application/xhtml+xml,*/*;q=0.1"),
false);
nsCOMPtr<nsILoadInfo> loadInfo = aChannel->GetLoadInfo();
if (loadInfo) {
nsCOMPtr<nsIURI> loaderUri;
loadInfo->TriggeringPrincipal()->GetURI(getter_AddRefs(loaderUri));
if (loaderUri) {
http->SetReferrerWithPolicy(loaderUri, aReferrerPolicy);
}
}
}
// Hook us up to listen to redirects and the like.
// Do this before setting up the cross-site proxy since
// that installs its own proxies.
mChannel->SetNotificationCallbacks(this);
// Get the loadgroup of the channel
nsCOMPtr<nsILoadGroup> loadGroup;
rv = aChannel->GetLoadGroup(getter_AddRefs(loadGroup));
NS_ENSURE_SUCCESS(rv, rv);
// Create document
nsCOMPtr<nsIDocument> document;
rv = NS_NewXMLDocument(getter_AddRefs(document));
NS_ENSURE_SUCCESS(rv, rv);
// Start the document load. Do this before we attach the load listener
// since we reset the document which drops all observers.
nsCOMPtr<nsIStreamListener> listener;
rv = document->StartDocumentLoad(kLoadAsData, mChannel,
loadGroup, nullptr,
getter_AddRefs(listener),
true);
NS_ENSURE_SUCCESS(rv, rv);
if (aForceToXML) {
nsCOMPtr<nsIStreamListener> forceListener =
new nsForceXMLListener(listener);
listener.swap(forceListener);
}
if (aChannelIsSync) {
rv = PushSyncStream(listener);
}
else {
rv = PushAsyncStream(listener);
}
http = do_QueryInterface(mChannel);
if (NS_SUCCEEDED(rv) && http) {
bool succeeded;
if (NS_FAILED(http->GetRequestSucceeded(&succeeded)) || !succeeded) {
rv = NS_ERROR_FAILURE;
}
}
mChannel = nullptr;
// check that the load succeeded
NS_ENSURE_SUCCESS(rv, rv);
NS_ENSURE_TRUE(document->GetRootElement(), NS_ERROR_FAILURE);
return CallQueryInterface(document, aResult);
}
nsresult
nsSyncLoader::PushAsyncStream(nsIStreamListener* aListener)
{
mListener = aListener;
mAsyncLoadStatus = NS_OK;
// Start reading from the channel
nsresult rv = mChannel->AsyncOpen2(this);
if (NS_SUCCEEDED(rv)) {
// process events until we're finished.
mLoading = true;
nsIThread *thread = NS_GetCurrentThread();
while (mLoading && NS_SUCCEEDED(rv)) {
bool processedEvent;
rv = thread->ProcessNextEvent(true, &processedEvent);
if (NS_SUCCEEDED(rv) && !processedEvent)
rv = NS_ERROR_UNEXPECTED;
}
}
mListener = nullptr;
NS_ENSURE_SUCCESS(rv, rv);
// Note that if AsyncOpen failed that's ok -- the only caller of
// this method nulls out mChannel immediately after we return.
return mAsyncLoadStatus;
}
nsresult
nsSyncLoader::PushSyncStream(nsIStreamListener* aListener)
{
nsCOMPtr<nsIInputStream> in;
nsresult rv = mChannel->Open2(getter_AddRefs(in));
NS_ENSURE_SUCCESS(rv, rv);
mLoading = true;
rv = nsSyncLoadService::PushSyncStreamToListener(in, aListener, mChannel);
mLoading = false;
return rv;
}
NS_IMETHODIMP
nsSyncLoader::OnStartRequest(nsIRequest *aRequest, nsISupports *aContext)
{
return mListener->OnStartRequest(aRequest, aContext);
}
NS_IMETHODIMP
nsSyncLoader::OnStopRequest(nsIRequest *aRequest, nsISupports *aContext,
nsresult aStatusCode)
{
if (NS_SUCCEEDED(mAsyncLoadStatus) && NS_FAILED(aStatusCode)) {
mAsyncLoadStatus = aStatusCode;
}
nsresult rv = mListener->OnStopRequest(aRequest, aContext, aStatusCode);
if (NS_SUCCEEDED(mAsyncLoadStatus) && NS_FAILED(rv)) {
mAsyncLoadStatus = rv;
}
mLoading = false;
return rv;
}
NS_IMETHODIMP
nsSyncLoader::AsyncOnChannelRedirect(nsIChannel *aOldChannel,
nsIChannel *aNewChannel,
uint32_t aFlags,
nsIAsyncVerifyRedirectCallback *callback)
{
NS_PRECONDITION(aNewChannel, "Redirecting to null channel?");
mChannel = aNewChannel;
callback->OnRedirectVerifyCallback(NS_OK);
return NS_OK;
}
NS_IMETHODIMP
nsSyncLoader::GetInterface(const nsIID & aIID,
void **aResult)
{
return QueryInterface(aIID, aResult);
}
/* static */
nsresult
nsSyncLoadService::LoadDocument(nsIURI *aURI,
nsContentPolicyType aContentPolicyType,
nsIPrincipal *aLoaderPrincipal,
nsSecurityFlags aSecurityFlags,
nsILoadGroup *aLoadGroup,
bool aForceToXML,
ReferrerPolicy aReferrerPolicy,
nsIDOMDocument** aResult)
{
nsCOMPtr<nsIChannel> channel;
nsresult rv = NS_NewChannel(getter_AddRefs(channel),
aURI,
aLoaderPrincipal,
aSecurityFlags,
aContentPolicyType,
aLoadGroup);
NS_ENSURE_SUCCESS(rv, rv);
if (!aForceToXML) {
channel->SetContentType(NS_LITERAL_CSTRING("text/xml"));
}
bool isChrome = false, isResource = false;
// if the load needs to enforce CORS, then force the load to be async
bool isSync =
!(aSecurityFlags & nsILoadInfo::SEC_REQUIRE_CORS_DATA_INHERITS) &&
((NS_SUCCEEDED(aURI->SchemeIs("chrome", &isChrome)) && isChrome) ||
(NS_SUCCEEDED(aURI->SchemeIs("resource", &isResource)) && isResource));
RefPtr<nsSyncLoader> loader = new nsSyncLoader();
return loader->LoadDocument(channel, isSync, aForceToXML,
aReferrerPolicy, aResult);
}
/* static */
nsresult
nsSyncLoadService::PushSyncStreamToListener(nsIInputStream* aIn,
nsIStreamListener* aListener,
nsIChannel* aChannel)
{
// Set up buffering stream
nsresult rv;
nsCOMPtr<nsIInputStream> bufferedStream;
if (!NS_InputStreamIsBuffered(aIn)) {
int64_t chunkSize;
rv = aChannel->GetContentLength(&chunkSize);
if (NS_FAILED(rv) || chunkSize < 1) {
chunkSize = 4096;
}
chunkSize = std::min(int64_t(UINT16_MAX), chunkSize);
rv = NS_NewBufferedInputStream(getter_AddRefs(bufferedStream), aIn,
chunkSize);
NS_ENSURE_SUCCESS(rv, rv);
aIn = bufferedStream;
}
// Load
rv = aListener->OnStartRequest(aChannel, nullptr);
if (NS_SUCCEEDED(rv)) {
uint64_t sourceOffset = 0;
while (1) {
uint64_t readCount = 0;
rv = aIn->Available(&readCount);
if (NS_FAILED(rv) || !readCount) {
if (rv == NS_BASE_STREAM_CLOSED) {
// End of file, but not an error
rv = NS_OK;
}
break;
}
if (readCount > UINT32_MAX)
readCount = UINT32_MAX;
rv = aListener->OnDataAvailable(aChannel, nullptr, aIn,
(uint32_t)std::min(sourceOffset, (uint64_t)UINT32_MAX),
(uint32_t)readCount);
if (NS_FAILED(rv)) {
break;
}
sourceOffset += readCount;
}
}
if (NS_FAILED(rv)) {
aChannel->Cancel(rv);
}
aListener->OnStopRequest(aChannel, nullptr, rv);
return rv;
}