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gecko-dev/uriloader/base/nsURILoader.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode:nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sts=2 sw=2 et cin: */
/* 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 "nsURILoader.h"
#include "nsAutoPtr.h"
#include "nsIURIContentListener.h"
#include "nsIContentHandler.h"
#include "nsILoadGroup.h"
#include "nsIDocumentLoader.h"
#include "nsIWebProgress.h"
#include "nsIWebProgressListener.h"
#include "nsIIOService.h"
#include "nsIServiceManager.h"
#include "nsIStreamListener.h"
#include "nsIURI.h"
#include "nsIChannel.h"
#include "nsIInterfaceRequestor.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsIProgressEventSink.h"
#include "nsIInputStream.h"
#include "nsIStreamConverterService.h"
#include "nsIWeakReferenceUtils.h"
#include "nsIHttpChannel.h"
#include "nsIMultiPartChannel.h"
#include "netCore.h"
#include "nsCRT.h"
#include "nsIDocShell.h"
#include "nsIDocShellTreeItem.h"
#include "nsIDocShellTreeOwner.h"
#include "nsIThreadRetargetableStreamListener.h"
#include "nsString.h"
#include "nsThreadUtils.h"
#include "nsReadableUtils.h"
#include "nsError.h"
#include "nsICategoryManager.h"
#include "nsCExternalHandlerService.h" // contains contractids for the helper app service
#include "nsIMIMEHeaderParam.h"
#include "nsNetCID.h"
#include "nsMimeTypes.h"
#include "nsDocLoader.h"
#include "mozilla/Attributes.h"
#include "mozilla/IntegerPrintfMacros.h"
#include "mozilla/Preferences.h"
#include "mozilla/Unused.h"
#include "nsContentUtils.h"
mozilla::LazyLogModule nsURILoader::mLog("URILoader");
#define LOG(args) MOZ_LOG(nsURILoader::mLog, mozilla::LogLevel::Debug, args)
#define LOG_ERROR(args) \
MOZ_LOG(nsURILoader::mLog, mozilla::LogLevel::Error, args)
#define LOG_ENABLED() MOZ_LOG_TEST(nsURILoader::mLog, mozilla::LogLevel::Debug)
#define NS_PREF_DISABLE_BACKGROUND_HANDLING \
"security.exthelperapp.disable_background_handling"
static uint32_t sConvertDataLimit = 20;
static bool InitPreferences() {
nsresult rv = mozilla::Preferences::AddUintVarCache(
&sConvertDataLimit, "general.document_open_conversion_depth_limit", 20);
return NS_SUCCEEDED(rv);
}
/**
* The nsDocumentOpenInfo contains the state required when a single
* document is being opened in order to discover the content type...
* Each instance remains alive until its target URL has been loaded
* (or aborted).
*/
class nsDocumentOpenInfo final : public nsIStreamListener,
public nsIThreadRetargetableStreamListener {
public:
// Real constructor
// aFlags is a combination of the flags on nsIURILoader
nsDocumentOpenInfo(nsIInterfaceRequestor* aWindowContext, uint32_t aFlags,
nsURILoader* aURILoader);
NS_DECL_THREADSAFE_ISUPPORTS
/**
* Prepares this object for receiving data. The stream
* listener methods of this class must not be called before calling this
* method.
*/
nsresult Prepare();
// Call this (from OnStartRequest) to attempt to find an nsIStreamListener to
// take the data off our hands.
nsresult DispatchContent(nsIRequest* request, nsISupports* aCtxt);
// Call this if we need to insert a stream converter from aSrcContentType to
// aOutContentType into the StreamListener chain. DO NOT call it if the two
// types are the same, since no conversion is needed in that case.
nsresult ConvertData(nsIRequest* request, nsIURIContentListener* aListener,
const nsACString& aSrcContentType,
const nsACString& aOutContentType);
/**
* Function to attempt to use aListener to handle the load. If
* true is returned, nothing else needs to be done; if false
* is returned, then a different way of handling the load should be
* tried.
*/
bool TryContentListener(nsIURIContentListener* aListener,
nsIChannel* aChannel);
// nsIRequestObserver methods:
NS_DECL_NSIREQUESTOBSERVER
// nsIStreamListener methods:
NS_DECL_NSISTREAMLISTENER
// nsIThreadRetargetableStreamListener
NS_DECL_NSITHREADRETARGETABLESTREAMLISTENER
protected:
~nsDocumentOpenInfo();
protected:
/**
* The first content listener to try dispatching data to. Typically
* the listener associated with the entity that originated the load.
*/
nsCOMPtr<nsIURIContentListener> m_contentListener;
/**
* The stream listener to forward nsIStreamListener notifications
* to. This is set once the load is dispatched.
*/
nsCOMPtr<nsIStreamListener> m_targetStreamListener;
/**
* A pointer to the entity that originated the load. We depend on getting
* things like nsIURIContentListeners, nsIDOMWindows, etc off of it.
*/
nsCOMPtr<nsIInterfaceRequestor> m_originalContext;
/**
* IS_CONTENT_PREFERRED is used for the boolean to pass to CanHandleContent
* (also determines whether we use CanHandleContent or IsPreferred).
* DONT_RETARGET means that we will only try m_originalContext, no other
* listeners.
*/
uint32_t mFlags;
/**
* The type of the data we will be trying to dispatch.
*/
nsCString mContentType;
/**
* Reference to the URILoader service so we can access its list of
* nsIURIContentListeners.
*/
RefPtr<nsURILoader> mURILoader;
/**
* Limit of data conversion depth to prevent infinite conversion loops
*/
uint32_t mDataConversionDepthLimit;
};
NS_IMPL_ADDREF(nsDocumentOpenInfo)
NS_IMPL_RELEASE(nsDocumentOpenInfo)
NS_INTERFACE_MAP_BEGIN(nsDocumentOpenInfo)
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIRequestObserver)
NS_INTERFACE_MAP_ENTRY(nsIRequestObserver)
NS_INTERFACE_MAP_ENTRY(nsIStreamListener)
NS_INTERFACE_MAP_ENTRY(nsIThreadRetargetableStreamListener)
NS_INTERFACE_MAP_END
nsDocumentOpenInfo::nsDocumentOpenInfo(nsIInterfaceRequestor* aWindowContext,
uint32_t aFlags, nsURILoader* aURILoader)
: m_originalContext(aWindowContext),
mFlags(aFlags),
mURILoader(aURILoader),
mDataConversionDepthLimit(sConvertDataLimit) {}
nsDocumentOpenInfo::~nsDocumentOpenInfo() {}
nsresult nsDocumentOpenInfo::Prepare() {
LOG(("[0x%p] nsDocumentOpenInfo::Prepare", this));
nsresult rv;
// ask our window context if it has a uri content listener...
m_contentListener = do_GetInterface(m_originalContext, &rv);
return rv;
}
NS_IMETHODIMP nsDocumentOpenInfo::OnStartRequest(nsIRequest* request,
nsISupports* aCtxt) {
LOG(("[0x%p] nsDocumentOpenInfo::OnStartRequest", this));
MOZ_ASSERT(request);
if (!request) {
return NS_ERROR_UNEXPECTED;
}
nsresult rv = NS_OK;
//
// Deal with "special" HTTP responses:
//
// - In the case of a 204 (No Content) or 205 (Reset Content) response, do
// not try to find a content handler. Return NS_BINDING_ABORTED to cancel
// the request. This has the effect of ensuring that the DocLoader does
// not try to interpret this as a real request.
//
nsCOMPtr<nsIHttpChannel> httpChannel(do_QueryInterface(request, &rv));
if (NS_SUCCEEDED(rv)) {
uint32_t responseCode = 0;
rv = httpChannel->GetResponseStatus(&responseCode);
if (NS_FAILED(rv)) {
LOG_ERROR((" Failed to get HTTP response status"));
// behave as in the canceled case
return NS_OK;
}
LOG((" HTTP response status: %d", responseCode));
if (204 == responseCode || 205 == responseCode) {
return NS_BINDING_ABORTED;
}
static bool sLargeAllocationTestingAllHttpLoads = false;
static bool sLargeAllocationHeaderEnabled = false;
static bool sCachedLargeAllocationPref = false;
if (!sCachedLargeAllocationPref) {
sCachedLargeAllocationPref = true;
mozilla::Preferences::AddBoolVarCache(
&sLargeAllocationHeaderEnabled, "dom.largeAllocationHeader.enabled");
mozilla::Preferences::AddBoolVarCache(
&sLargeAllocationTestingAllHttpLoads,
"dom.largeAllocation.testing.allHttpLoads");
}
if (sLargeAllocationHeaderEnabled) {
if (sLargeAllocationTestingAllHttpLoads) {
nsCOMPtr<nsIURI> uri;
rv = httpChannel->GetURI(getter_AddRefs(uri));
if (NS_SUCCEEDED(rv) && uri) {
bool httpScheme = false;
bool httpsScheme = false;
uri->SchemeIs("http", &httpScheme);
uri->SchemeIs("https", &httpsScheme);
if ((httpScheme || httpsScheme) &&
nsContentUtils::AttemptLargeAllocationLoad(httpChannel)) {
return NS_BINDING_ABORTED;
}
}
}
// If we have a Large-Allocation header, let's check if we should perform
// a process switch.
nsAutoCString largeAllocationHeader;
rv = httpChannel->GetResponseHeader(
NS_LITERAL_CSTRING("Large-Allocation"), largeAllocationHeader);
if (NS_SUCCEEDED(rv) &&
nsContentUtils::AttemptLargeAllocationLoad(httpChannel)) {
return NS_BINDING_ABORTED;
}
}
}
//
// Make sure that the transaction has succeeded, so far...
//
nsresult status;
rv = request->GetStatus(&status);
NS_ASSERTION(NS_SUCCEEDED(rv), "Unable to get request status!");
if (NS_FAILED(rv)) return rv;
if (NS_FAILED(status)) {
LOG_ERROR(
(" Request failed, status: 0x%08" PRIX32, static_cast<uint32_t>(rv)));
//
// The transaction has already reported an error - so it will be torn
// down. Therefore, it is not necessary to return an error code...
//
return NS_OK;
}
rv = DispatchContent(request, aCtxt);
LOG((" After dispatch, m_targetStreamListener: 0x%p, rv: 0x%08" PRIX32,
m_targetStreamListener.get(), static_cast<uint32_t>(rv)));
NS_ASSERTION(
NS_SUCCEEDED(rv) || !m_targetStreamListener,
"Must not have an m_targetStreamListener with a failure return!");
NS_ENSURE_SUCCESS(rv, rv);
if (m_targetStreamListener)
rv = m_targetStreamListener->OnStartRequest(request, aCtxt);
LOG((" OnStartRequest returning: 0x%08" PRIX32, static_cast<uint32_t>(rv)));
return rv;
}
NS_IMETHODIMP
nsDocumentOpenInfo::CheckListenerChain() {
NS_ASSERTION(NS_IsMainThread(), "Should be on the main thread!");
nsresult rv = NS_OK;
nsCOMPtr<nsIThreadRetargetableStreamListener> retargetableListener =
do_QueryInterface(m_targetStreamListener, &rv);
if (retargetableListener) {
rv = retargetableListener->CheckListenerChain();
}
LOG(
("[0x%p] nsDocumentOpenInfo::CheckListenerChain %s listener %p rv "
"%" PRIx32,
this, (NS_SUCCEEDED(rv) ? "success" : "failure"),
(nsIStreamListener*)m_targetStreamListener, static_cast<uint32_t>(rv)));
return rv;
}
NS_IMETHODIMP
nsDocumentOpenInfo::OnDataAvailable(nsIRequest* request, nsISupports* aCtxt,
nsIInputStream* inStr,
uint64_t sourceOffset, uint32_t count) {
// if we have retarged to the end stream listener, then forward the call....
// otherwise, don't do anything
nsresult rv = NS_OK;
if (m_targetStreamListener)
rv = m_targetStreamListener->OnDataAvailable(request, aCtxt, inStr,
sourceOffset, count);
return rv;
}
NS_IMETHODIMP nsDocumentOpenInfo::OnStopRequest(nsIRequest* request,
nsISupports* aCtxt,
nsresult aStatus) {
LOG(("[0x%p] nsDocumentOpenInfo::OnStopRequest", this));
if (m_targetStreamListener) {
nsCOMPtr<nsIStreamListener> listener(m_targetStreamListener);
// If this is a multipart stream, we could get another
// OnStartRequest after this... reset state.
m_targetStreamListener = nullptr;
mContentType.Truncate();
listener->OnStopRequest(request, aCtxt, aStatus);
}
// Remember...
// In the case of multiplexed streams (such as multipart/x-mixed-replace)
// these stream listener methods could be called again :-)
//
return NS_OK;
}
nsresult nsDocumentOpenInfo::DispatchContent(nsIRequest* request,
nsISupports* aCtxt) {
LOG(("[0x%p] nsDocumentOpenInfo::DispatchContent for type '%s'", this,
mContentType.get()));
MOZ_ASSERT(!m_targetStreamListener,
"Why do we already have a target stream listener?");
nsresult rv;
nsCOMPtr<nsIChannel> aChannel = do_QueryInterface(request);
if (!aChannel) {
LOG_ERROR((" Request is not a channel. Bailing."));
return NS_ERROR_FAILURE;
}
NS_NAMED_LITERAL_CSTRING(anyType, "*/*");
if (mContentType.IsEmpty() || mContentType == anyType) {
rv = aChannel->GetContentType(mContentType);
if (NS_FAILED(rv)) return rv;
LOG((" Got type from channel: '%s'", mContentType.get()));
}
bool isGuessFromExt =
mContentType.LowerCaseEqualsASCII(APPLICATION_GUESS_FROM_EXT);
if (isGuessFromExt) {
// Reset to application/octet-stream for now; no one other than the
// external helper app service should see APPLICATION_GUESS_FROM_EXT.
mContentType = APPLICATION_OCTET_STREAM;
aChannel->SetContentType(NS_LITERAL_CSTRING(APPLICATION_OCTET_STREAM));
}
// Check whether the data should be forced to be handled externally. This
// could happen because the Content-Disposition header is set so, or, in the
// future, because the user has specified external handling for the MIME
// type.
bool forceExternalHandling = false;
uint32_t disposition;
rv = aChannel->GetContentDisposition(&disposition);
if (NS_SUCCEEDED(rv) && disposition == nsIChannel::DISPOSITION_ATTACHMENT) {
forceExternalHandling = true;
}
LOG((" forceExternalHandling: %s", forceExternalHandling ? "yes" : "no"));
if (!forceExternalHandling) {
//
// First step: See whether m_contentListener wants to handle this
// content type.
//
if (m_contentListener && TryContentListener(m_contentListener, aChannel)) {
LOG((" Success! Our default listener likes this type"));
// All done here
return NS_OK;
}
// If we aren't allowed to try other listeners, just skip through to
// trying to convert the data.
if (!(mFlags & nsIURILoader::DONT_RETARGET)) {
//
// Second step: See whether some other registered listener wants
// to handle this content type.
//
int32_t count = mURILoader->m_listeners.Count();
nsCOMPtr<nsIURIContentListener> listener;
for (int32_t i = 0; i < count; i++) {
listener = do_QueryReferent(mURILoader->m_listeners[i]);
if (listener) {
if (TryContentListener(listener, aChannel)) {
LOG((" Found listener registered on the URILoader"));
return NS_OK;
}
} else {
// remove from the listener list, reset i and update count
mURILoader->m_listeners.RemoveObjectAt(i--);
--count;
}
}
//
// Third step: Try to find a content listener that has not yet had
// the chance to register, as it is contained in a not-yet-loaded
// module, but which has registered a contract ID.
//
nsCOMPtr<nsICategoryManager> catman =
do_GetService(NS_CATEGORYMANAGER_CONTRACTID);
if (catman) {
nsCString contractidString;
rv = catman->GetCategoryEntry(NS_CONTENT_LISTENER_CATEGORYMANAGER_ENTRY,
mContentType, contractidString);
if (NS_SUCCEEDED(rv) && !contractidString.IsEmpty()) {
LOG((" Listener contractid for '%s' is '%s'", mContentType.get(),
contractidString.get()));
listener = do_CreateInstance(contractidString.get());
LOG((" Listener from category manager: 0x%p", listener.get()));
if (listener && TryContentListener(listener, aChannel)) {
LOG((" Listener from category manager likes this type"));
return NS_OK;
}
}
}
//
// Fourth step: try to find an nsIContentHandler for our type.
//
nsAutoCString handlerContractID(NS_CONTENT_HANDLER_CONTRACTID_PREFIX);
handlerContractID += mContentType;
nsCOMPtr<nsIContentHandler> contentHandler =
do_CreateInstance(handlerContractID.get());
if (contentHandler) {
LOG((" Content handler found"));
rv = contentHandler->HandleContent(mContentType.get(),
m_originalContext, request);
// XXXbz returning an error code to represent handling the
// content is just bizarre!
if (rv != NS_ERROR_WONT_HANDLE_CONTENT) {
if (NS_FAILED(rv)) {
// The content handler has unexpectedly failed. Cancel the request
// just in case the handler didn't...
LOG((" Content handler failed. Aborting load"));
request->Cancel(rv);
} else {
LOG((" Content handler taking over load"));
}
return rv;
}
}
} else {
LOG(
(" DONT_RETARGET flag set, so skipped over random other content "
"listeners and content handlers"));
}
//
// Fifth step: If no listener prefers this type, see if any stream
// converters exist to transform this content type into
// some other.
//
// Don't do this if the server sent us a MIME type of "*/*" because they saw
// it in our Accept header and got confused.
// XXXbz have to be careful here; may end up in some sort of bizarre
// infinite decoding loop.
if (mContentType != anyType) {
rv = ConvertData(request, m_contentListener, mContentType, anyType);
if (NS_FAILED(rv)) {
m_targetStreamListener = nullptr;
} else if (m_targetStreamListener) {
// We found a converter for this MIME type. We'll just pump data into
// it and let the downstream nsDocumentOpenInfo handle things.
LOG((" Converter taking over now"));
return NS_OK;
}
}
}
NS_ASSERTION(!m_targetStreamListener,
"If we found a listener, why are we not using it?");
if (mFlags & nsIURILoader::DONT_RETARGET) {
LOG(
(" External handling forced or (listener not interested and no "
"stream converter exists), and retargeting disallowed -> aborting"));
return NS_ERROR_WONT_HANDLE_CONTENT;
}
// Before dispatching to the external helper app service, check for an HTTP
// error page. If we got one, we don't want to handle it with a helper app,
// really.
nsCOMPtr<nsIHttpChannel> httpChannel(do_QueryInterface(request));
if (httpChannel) {
bool requestSucceeded;
rv = httpChannel->GetRequestSucceeded(&requestSucceeded);
if (NS_FAILED(rv) || !requestSucceeded) {
// returning error from OnStartRequest will cancel the channel
return NS_ERROR_FILE_NOT_FOUND;
}
}
// Sixth step:
//
// All attempts to dispatch this content have failed. Just pass it off to
// the helper app service.
//
//
// Optionally, we may want to disable background handling by the external
// helper application service.
//
if (mozilla::Preferences::GetBool(NS_PREF_DISABLE_BACKGROUND_HANDLING,
false)) {
// First, we will ensure that the parent docshell is in an active
// state as we will disallow all external application handling unless it is
// in the foreground.
nsCOMPtr<nsIDocShell> docShell(do_GetInterface(m_originalContext));
if (!docShell) {
// If we can't perform our security check we definitely don't want to go
// any further!
LOG(
("Failed to get DocShell to ensure it is active before anding off to "
"helper app service. Aborting."));
return NS_ERROR_FAILURE;
}
// Ensure the DocShell is active before continuing.
bool isActive = false;
docShell->GetIsActive(&isActive);
if (!isActive) {
LOG(
(" Check for active DocShell returned false. Aborting hand off to "
"helper app service."));
return NS_ERROR_DOM_SECURITY_ERR;
}
}
nsCOMPtr<nsIExternalHelperAppService> helperAppService =
do_GetService(NS_EXTERNALHELPERAPPSERVICE_CONTRACTID, &rv);
if (helperAppService) {
LOG((" Passing load off to helper app service"));
// Set these flags to indicate that the channel has been targeted and that
// we are not using the original consumer.
nsLoadFlags loadFlags = 0;
request->GetLoadFlags(&loadFlags);
request->SetLoadFlags(loadFlags | nsIChannel::LOAD_RETARGETED_DOCUMENT_URI |
nsIChannel::LOAD_TARGETED);
if (isGuessFromExt) {
mContentType = APPLICATION_GUESS_FROM_EXT;
aChannel->SetContentType(NS_LITERAL_CSTRING(APPLICATION_GUESS_FROM_EXT));
}
rv = helperAppService->DoContent(mContentType, request, m_originalContext,
false, nullptr,
getter_AddRefs(m_targetStreamListener));
if (NS_FAILED(rv)) {
request->SetLoadFlags(loadFlags);
m_targetStreamListener = nullptr;
}
}
NS_ASSERTION(m_targetStreamListener || NS_FAILED(rv),
"There is no way we should be successful at this point without "
"a m_targetStreamListener");
return rv;
}
nsresult nsDocumentOpenInfo::ConvertData(nsIRequest* request,
nsIURIContentListener* aListener,
const nsACString& aSrcContentType,
const nsACString& aOutContentType) {
LOG(("[0x%p] nsDocumentOpenInfo::ConvertData from '%s' to '%s'", this,
PromiseFlatCString(aSrcContentType).get(),
PromiseFlatCString(aOutContentType).get()));
if (mDataConversionDepthLimit == 0) {
LOG((
"[0x%p] nsDocumentOpenInfo::ConvertData - reached the recursion limit!",
this));
// This will fall back to external helper app handling.
return NS_ERROR_ABORT;
}
MOZ_ASSERT(aSrcContentType != aOutContentType,
"ConvertData called when the two types are the same!");
nsresult rv = NS_OK;
nsCOMPtr<nsIStreamConverterService> StreamConvService =
do_GetService(NS_STREAMCONVERTERSERVICE_CONTRACTID, &rv);
if (NS_FAILED(rv)) return rv;
LOG((" Got converter service"));
// When applying stream decoders, it is necessary to "insert" an
// intermediate nsDocumentOpenInfo instance to handle the targeting of
// the "final" stream or streams.
//
// For certain content types (ie. multi-part/x-mixed-replace) the input
// stream is split up into multiple destination streams. This
// intermediate instance is used to target these "decoded" streams...
//
RefPtr<nsDocumentOpenInfo> nextLink =
new nsDocumentOpenInfo(m_originalContext, mFlags, mURILoader);
LOG((" Downstream DocumentOpenInfo would be: 0x%p", nextLink.get()));
// Decrease the conversion recursion limit by one to prevent infinite loops.
nextLink->mDataConversionDepthLimit = mDataConversionDepthLimit - 1;
// Make sure nextLink starts with the contentListener that said it wanted the
// results of this decode.
nextLink->m_contentListener = aListener;
// Also make sure it has to look for a stream listener to pump data into.
nextLink->m_targetStreamListener = nullptr;
// Make sure that nextLink treats the data as aOutContentType when
// dispatching; that way even if the stream converters don't change the type
// on the channel we will still do the right thing. If aOutContentType is
// */*, that's OK -- that will just indicate to nextLink that it should get
// the type off the channel.
nextLink->mContentType = aOutContentType;
// The following call sets m_targetStreamListener to the input end of the
// stream converter and sets the output end of the stream converter to
// nextLink. As we pump data into m_targetStreamListener the stream
// converter will convert it and pass the converted data to nextLink.
return StreamConvService->AsyncConvertData(
PromiseFlatCString(aSrcContentType).get(),
PromiseFlatCString(aOutContentType).get(), nextLink, request,
getter_AddRefs(m_targetStreamListener));
}
bool nsDocumentOpenInfo::TryContentListener(nsIURIContentListener* aListener,
nsIChannel* aChannel) {
LOG(("[0x%p] nsDocumentOpenInfo::TryContentListener; mFlags = 0x%x", this,
mFlags));
MOZ_ASSERT(aListener, "Must have a non-null listener");
MOZ_ASSERT(aChannel, "Must have a channel");
bool listenerWantsContent = false;
nsCString typeToUse;
if (mFlags & nsIURILoader::IS_CONTENT_PREFERRED) {
aListener->IsPreferred(mContentType.get(), getter_Copies(typeToUse),
&listenerWantsContent);
} else {
aListener->CanHandleContent(mContentType.get(), false,
getter_Copies(typeToUse),
&listenerWantsContent);
}
if (!listenerWantsContent) {
LOG((" Listener is not interested"));
return false;
}
if (!typeToUse.IsEmpty() && typeToUse != mContentType) {
// Need to do a conversion here.
nsresult rv = ConvertData(aChannel, aListener, mContentType, typeToUse);
if (NS_FAILED(rv)) {
// No conversion path -- we don't want this listener, if we got one
m_targetStreamListener = nullptr;
}
LOG((" Found conversion: %s", m_targetStreamListener ? "yes" : "no"));
// m_targetStreamListener is now the input end of the converter, and we can
// just pump the data in there, if it exists. If it does not, we need to
// try other nsIURIContentListeners.
return m_targetStreamListener != nullptr;
}
// At this point, aListener wants data of type mContentType. Let 'em have
// it. But first, if we are retargeting, set an appropriate flag on the
// channel
nsLoadFlags loadFlags = 0;
aChannel->GetLoadFlags(&loadFlags);
// Set this flag to indicate that the channel has been targeted at a final
// consumer. This load flag is tested in nsDocLoader::OnProgress.
nsLoadFlags newLoadFlags = nsIChannel::LOAD_TARGETED;
nsCOMPtr<nsIURIContentListener> originalListener =
do_GetInterface(m_originalContext);
if (originalListener != aListener) {
newLoadFlags |= nsIChannel::LOAD_RETARGETED_DOCUMENT_URI;
}
aChannel->SetLoadFlags(loadFlags | newLoadFlags);
bool abort = false;
bool isPreferred = (mFlags & nsIURILoader::IS_CONTENT_PREFERRED) != 0;
nsresult rv =
aListener->DoContent(mContentType, isPreferred, aChannel,
getter_AddRefs(m_targetStreamListener), &abort);
if (NS_FAILED(rv)) {
LOG_ERROR((" DoContent failed"));
// Unset the RETARGETED_DOCUMENT_URI flag if we set it...
aChannel->SetLoadFlags(loadFlags);
m_targetStreamListener = nullptr;
return false;
}
if (abort) {
// Nothing else to do here -- aListener is handling it all. Make
// sure m_targetStreamListener is null so we don't do anything
// after this point.
LOG((" Listener has aborted the load"));
m_targetStreamListener = nullptr;
}
NS_ASSERTION(abort || m_targetStreamListener,
"DoContent returned no listener?");
// aListener is handling the load from this point on.
return true;
}
///////////////////////////////////////////////////////////////////////////////////////////////
// Implementation of nsURILoader
///////////////////////////////////////////////////////////////////////////////////////////////
nsURILoader::nsURILoader() {}
nsURILoader::~nsURILoader() {}
NS_IMPL_ADDREF(nsURILoader)
NS_IMPL_RELEASE(nsURILoader)
NS_INTERFACE_MAP_BEGIN(nsURILoader)
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIURILoader)
NS_INTERFACE_MAP_ENTRY(nsIURILoader)
NS_INTERFACE_MAP_END
NS_IMETHODIMP nsURILoader::RegisterContentListener(
nsIURIContentListener* aContentListener) {
nsresult rv = NS_OK;
nsWeakPtr weakListener = do_GetWeakReference(aContentListener);
NS_ASSERTION(weakListener,
"your URIContentListener must support weak refs!\n");
if (weakListener) m_listeners.AppendObject(weakListener);
return rv;
}
NS_IMETHODIMP nsURILoader::UnRegisterContentListener(
nsIURIContentListener* aContentListener) {
nsWeakPtr weakListener = do_GetWeakReference(aContentListener);
if (weakListener) m_listeners.RemoveObject(weakListener);
return NS_OK;
}
NS_IMETHODIMP nsURILoader::OpenURI(nsIChannel* channel, uint32_t aFlags,
nsIInterfaceRequestor* aWindowContext) {
NS_ENSURE_ARG_POINTER(channel);
if (LOG_ENABLED()) {
nsCOMPtr<nsIURI> uri;
channel->GetURI(getter_AddRefs(uri));
nsAutoCString spec;
uri->GetAsciiSpec(spec);
LOG(("nsURILoader::OpenURI for %s", spec.get()));
}
nsCOMPtr<nsIStreamListener> loader;
nsresult rv = OpenChannel(channel, aFlags, aWindowContext, false,
getter_AddRefs(loader));
if (NS_SUCCEEDED(rv)) {
// this method is not complete!!! Eventually, we should first go
// to the content listener and ask them for a protocol handler...
// if they don't give us one, we need to go to the registry and get
// the preferred protocol handler.
// But for now, I'm going to let necko do the work for us....
rv = channel->AsyncOpen2(loader);
// no content from this load - that's OK.
if (rv == NS_ERROR_NO_CONTENT) {
LOG((" rv is NS_ERROR_NO_CONTENT -- doing nothing"));
rv = NS_OK;
}
} else if (rv == NS_ERROR_WONT_HANDLE_CONTENT) {
// Not really an error, from this method's point of view
rv = NS_OK;
}
return rv;
}
nsresult nsURILoader::OpenChannel(nsIChannel* channel, uint32_t aFlags,
nsIInterfaceRequestor* aWindowContext,
bool aChannelIsOpen,
nsIStreamListener** aListener) {
NS_ASSERTION(channel, "Trying to open a null channel!");
NS_ASSERTION(aWindowContext, "Window context must not be null");
if (LOG_ENABLED()) {
nsCOMPtr<nsIURI> uri;
channel->GetURI(getter_AddRefs(uri));
nsAutoCString spec;
uri->GetAsciiSpec(spec);
LOG(("nsURILoader::OpenChannel for %s", spec.get()));
}
// Let the window context's uriListener know that the open is starting. This
// gives that window a chance to abort the load process.
nsCOMPtr<nsIURIContentListener> winContextListener(
do_GetInterface(aWindowContext));
if (winContextListener) {
nsCOMPtr<nsIURI> uri;
channel->GetURI(getter_AddRefs(uri));
if (uri) {
bool doAbort = false;
winContextListener->OnStartURIOpen(uri, &doAbort);
if (doAbort) {
LOG((" OnStartURIOpen aborted load"));
return NS_ERROR_WONT_HANDLE_CONTENT;
}
}
}
static bool once = InitPreferences();
mozilla::Unused << once;
// we need to create a DocumentOpenInfo object which will go ahead and open
// the url and discover the content type....
RefPtr<nsDocumentOpenInfo> loader =
new nsDocumentOpenInfo(aWindowContext, aFlags, this);
// Set the correct loadgroup on the channel
nsCOMPtr<nsILoadGroup> loadGroup(do_GetInterface(aWindowContext));
if (!loadGroup) {
// XXXbz This context is violating what we'd like to be the new uriloader
// api.... Set up a nsDocLoader to handle the loadgroup for this context.
// This really needs to go away!
nsCOMPtr<nsIURIContentListener> listener(do_GetInterface(aWindowContext));
if (listener) {
nsCOMPtr<nsISupports> cookie;
listener->GetLoadCookie(getter_AddRefs(cookie));
if (!cookie) {
RefPtr<nsDocLoader> newDocLoader = new nsDocLoader();
nsresult rv = newDocLoader->Init();
if (NS_FAILED(rv)) return rv;
rv = nsDocLoader::AddDocLoaderAsChildOfRoot(newDocLoader);
if (NS_FAILED(rv)) return rv;
cookie = nsDocLoader::GetAsSupports(newDocLoader);
listener->SetLoadCookie(cookie);
}
loadGroup = do_GetInterface(cookie);
}
}
// If the channel is pending, then we need to remove it from its current
// loadgroup
nsCOMPtr<nsILoadGroup> oldGroup;
channel->GetLoadGroup(getter_AddRefs(oldGroup));
if (aChannelIsOpen && !SameCOMIdentity(oldGroup, loadGroup)) {
// It is important to add the channel to the new group before
// removing it from the old one, so that the load isn't considered
// done as soon as the request is removed.
loadGroup->AddRequest(channel, nullptr);
if (oldGroup) {
oldGroup->RemoveRequest(channel, nullptr, NS_BINDING_RETARGETED);
}
}
channel->SetLoadGroup(loadGroup);
// prepare the loader for receiving data
nsresult rv = loader->Prepare();
if (NS_SUCCEEDED(rv)) NS_ADDREF(*aListener = loader);
return rv;
}
NS_IMETHODIMP nsURILoader::OpenChannel(nsIChannel* channel, uint32_t aFlags,
nsIInterfaceRequestor* aWindowContext,
nsIStreamListener** aListener) {
bool pending;
if (NS_FAILED(channel->IsPending(&pending))) {
pending = false;
}
return OpenChannel(channel, aFlags, aWindowContext, pending, aListener);
}
NS_IMETHODIMP nsURILoader::Stop(nsISupports* aLoadCookie) {
nsresult rv;
nsCOMPtr<nsIDocumentLoader> docLoader;
NS_ENSURE_ARG_POINTER(aLoadCookie);
docLoader = do_GetInterface(aLoadCookie, &rv);
if (docLoader) {
rv = docLoader->Stop();
}
return rv;
}
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