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gecko/uriloader/base/nsURILoader.cpp
cbiesinger@gmx.at 58c915e6bf Bug 382113 make sure to add the request to the new loadgroup before removing it 
from the old one so that onload doesn't fire before it should
Also make nsLoadGroup::AddRequest assert that the request isn't in the loadgroup yet
Finally, reenable the reftest that tests the <object> onload behaviour
r+sr=bz
2007-07-18 14:37:39 -07:00

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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: */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1999
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#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 "nsWeakReference.h"
#include "nsIHttpChannel.h"
#include "nsIMultiPartChannel.h"
#include "netCore.h"
#include "nsCRT.h"
#include "nsIDocShell.h"
#include "nsIDocShellTreeItem.h"
#include "nsIDocShellTreeOwner.h"
#include "nsXPIDLString.h"
#include "nsString.h"
#include "nsIDOMWindowInternal.h"
#include "nsReadableUtils.h"
#include "nsDOMError.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"
#ifdef PR_LOGGING
PRLogModuleInfo* nsURILoader::mLog = nsnull;
#endif
#define LOG(args) PR_LOG(nsURILoader::mLog, PR_LOG_DEBUG, args)
#define LOG_ERROR(args) PR_LOG(nsURILoader::mLog, PR_LOG_ERROR, args)
#define LOG_ENABLED() PR_LOG_TEST(nsURILoader::mLog, PR_LOG_DEBUG)
/**
* 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 : public nsIStreamListener
{
public:
// Needed for nsCOMPtr to work right... Don't call this!
nsDocumentOpenInfo();
// Real constructor
// aFlags is a combination of the flags on nsIURILoader
nsDocumentOpenInfo(nsIInterfaceRequestor* aWindowContext,
PRUint32 aFlags,
nsURILoader* aURILoader);
NS_DECL_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
* PR_TRUE is returned, nothing else needs to be done; if PR_FALSE
* is returned, then a different way of handling the load should be
* tried.
*/
PRBool TryContentListener(nsIURIContentListener* aListener,
nsIChannel* aChannel);
// nsIRequestObserver methods:
NS_DECL_NSIREQUESTOBSERVER
// nsIStreamListener methods:
NS_DECL_NSISTREAMLISTENER
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.
*/
PRUint32 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.
*/
nsRefPtr<nsURILoader> mURILoader;
};
NS_IMPL_THREADSAFE_ADDREF(nsDocumentOpenInfo)
NS_IMPL_THREADSAFE_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_END_THREADSAFE
nsDocumentOpenInfo::nsDocumentOpenInfo()
{
NS_NOTREACHED("This should never be called\n");
}
nsDocumentOpenInfo::nsDocumentOpenInfo(nsIInterfaceRequestor* aWindowContext,
PRUint32 aFlags,
nsURILoader* aURILoader)
: m_originalContext(aWindowContext),
mFlags(aFlags),
mURILoader(aURILoader)
{
}
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));
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)) {
PRUint32 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;
}
}
//
// 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%08X", 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;
}
if (httpChannel && mContentType.IsEmpty()) {
// This is our initial dispatch, and this is an HTTP channel. Check for
// the text/plain mess.
nsCAutoString contentTypeHdr;
httpChannel->GetResponseHeader(NS_LITERAL_CSTRING("Content-Type"),
contentTypeHdr);
nsCAutoString contentType;
httpChannel->GetContentType(contentType);
// Make sure to do a case-sensitive exact match comparison here. Apache
// 1.x just sends text/plain for "unknown", while Apache 2.x sends
// text/plain with a ISO-8859-1 charset. Debian's Apache version, just to
// be different, sends text/plain with iso-8859-1 charset. Don't do
// general case-insensitive comparison, since we really want to apply this
// crap as rarely as we can.
if (contentType.EqualsLiteral("text/plain") &&
(contentTypeHdr.EqualsLiteral("text/plain") ||
contentTypeHdr.Equals(
NS_LITERAL_CSTRING("text/plain; charset=ISO-8859-1")) ||
contentTypeHdr.Equals(
NS_LITERAL_CSTRING("text/plain; charset=iso-8859-1")))) {
// Check whether we have content-encoding. If we do, don't try to detect
// the type, since that will lead to the content being automatically
// decompressed....
nsCAutoString contentEncoding;
httpChannel->GetResponseHeader(NS_LITERAL_CSTRING("Content-Encoding"),
contentEncoding);
if (contentEncoding.IsEmpty()) {
// OK, this is initial dispatch of an HTTP response and its Content-Type
// header is exactly "text/plain". We need to check whether this is
// really text.... Note that some of our listeners will actually
// accept all types, including the APPLICATION_MAYBE_TEXT internal
// type, so we need to call ConvertData here manually instead of
// relying on DispatchContent to do it.
LOG((" Possibly bogus text/plain; trying to sniff for real type"));
rv = ConvertData(request, m_contentListener,
NS_LITERAL_CSTRING(APPLICATION_MAYBE_TEXT),
NS_LITERAL_CSTRING("*/*"));
if (NS_FAILED(rv)) {
// We failed to convert. Just go ahead and handle as the original
// type. If ConvertData happened to set our m_targetStreamListener,
// we don't want it!
m_targetStreamListener = nsnull;
}
else {
LOG((APPLICATION_MAYBE_TEXT " converter taking over now"));
}
}
}
}
// If we sniffed text/plain above, m_targetStreamListener may already be
// non-null.
if (!m_targetStreamListener) {
rv = DispatchContent(request, aCtxt);
}
LOG((" After dispatch, m_targetStreamListener: 0x%p, rv: 0x%08X", m_targetStreamListener.get(), 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%08X", rv));
return rv;
}
NS_IMETHODIMP nsDocumentOpenInfo::OnDataAvailable(nsIRequest *request, nsISupports * aCtxt,
nsIInputStream * inStr, PRUint32 sourceOffset, PRUint32 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 = 0;
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()));
NS_PRECONDITION(!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()));
}
PRBool 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.
PRBool forceExternalHandling = PR_FALSE;
nsCAutoString disposition;
nsCOMPtr<nsIHttpChannel> httpChannel(do_QueryInterface(request));
nsCOMPtr<nsIURI> uri;
if (httpChannel)
{
rv = httpChannel->GetResponseHeader(NS_LITERAL_CSTRING("content-disposition"),
disposition);
httpChannel->GetURI(getter_AddRefs(uri));
}
else
{
nsCOMPtr<nsIMultiPartChannel> multipartChannel(do_QueryInterface(request));
if (multipartChannel)
{
rv = multipartChannel->GetContentDisposition(disposition);
}
}
LOG((" Disposition header: '%s'", disposition.get()));
if (NS_SUCCEEDED(rv) && !disposition.IsEmpty())
{
nsCOMPtr<nsIMIMEHeaderParam> mimehdrpar = do_GetService(NS_MIMEHEADERPARAM_CONTRACTID, &rv);
if (NS_SUCCEEDED(rv))
{
nsCAutoString fallbackCharset;
if (uri)
uri->GetOriginCharset(fallbackCharset);
nsAutoString dispToken;
// Get the disposition type
rv = mimehdrpar->GetParameter(disposition, "", fallbackCharset,
PR_TRUE, nsnull, dispToken);
// RFC 2183, section 2.8 says that an unknown disposition
// value should be treated as "attachment"
// XXXbz this code is duplicated in GetFilenameAndExtensionFromChannel in
// nsExternalHelperAppService. Factor it out!
if (NS_FAILED(rv) ||
(// Some broken sites just send
// Content-Disposition: ; filename="file"
// screen those out here.
!dispToken.IsEmpty() &&
!dispToken.LowerCaseEqualsLiteral("inline") &&
// Broken sites just send
// Content-Disposition: filename="file"
// without a disposition token... screen those out.
!dispToken.EqualsIgnoreCase("filename", 8)) &&
// Also in use is Content-Disposition: name="file"
!dispToken.EqualsIgnoreCase("name", 4))
// We have a content-disposition of "attachment" or unknown
forceExternalHandling = PR_TRUE;
}
}
LOG((" forceExternalHandling: %s", forceExternalHandling ? "yes" : "no"));
// We're going to try to find a contentListener that can handle our data
nsCOMPtr<nsIURIContentListener> contentListener;
// The type or data the contentListener wants.
nsXPIDLCString desiredContentType;
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, we're done here.
if (!(mFlags & nsIURILoader::DONT_RETARGET)) {
//
// Second step: See whether some other registered listener wants
// to handle this content type.
//
PRInt32 count = mURILoader->m_listeners.Count();
nsCOMPtr<nsIURIContentListener> listener;
for (PRInt32 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) {
nsXPIDLCString contractidString;
rv = catman->GetCategoryEntry(NS_CONTENT_LISTENER_CATEGORYMANAGER_ENTRY,
mContentType.get(),
getter_Copies(contractidString));
if (NS_SUCCEEDED(rv) && !contractidString.IsEmpty()) {
LOG((" Listener contractid for '%s' is '%s'",
mContentType.get(), contractidString.get()));
listener = do_CreateInstance(contractidString);
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.
//
nsCAutoString 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);
}
#ifdef PR_LOGGING
else {
LOG((" Content handler taking over load"));
}
#endif
return rv;
}
}
}
} else if (mFlags & nsIURILoader::DONT_RETARGET) {
// External handling was forced, but we must not retarget
// -> abort
LOG((" External handling forced, but not allowed to retarget -> aborting"));
return NS_ERROR_WONT_HANDLE_CONTENT;
}
NS_ASSERTION(!m_targetStreamListener,
"If we found a listener, why are we not using it?");
//
// Fifth step: If no listener prefers this type, see if any stream
// converters exist to transform this content type into
// some other.
//
// We always want to do this, since even content being forced to
// be handled externally may need decoding (eg via the unknown
// content decoder).
// 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 = nsnull;
} 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;
}
}
if (mFlags & nsIURILoader::DONT_RETARGET) {
LOG((" 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.
if (httpChannel) {
PRBool requestSucceeded;
httpChannel->GetRequestSucceeded(&requestSucceeded);
if (!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.
//
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,
getter_AddRefs(m_targetStreamListener));
if (NS_FAILED(rv)) {
request->SetLoadFlags(loadFlags);
m_targetStreamListener = nsnull;
}
}
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()));
NS_PRECONDITION(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...
//
nsCOMPtr<nsDocumentOpenInfo> nextLink =
new nsDocumentOpenInfo(m_originalContext, mFlags, mURILoader);
if (!nextLink) return NS_ERROR_OUT_OF_MEMORY;
LOG((" Downstream DocumentOpenInfo would be: 0x%p", nextLink.get()));
// 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 = nsnull;
// 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));
}
PRBool
nsDocumentOpenInfo::TryContentListener(nsIURIContentListener* aListener,
nsIChannel* aChannel)
{
LOG(("[0x%p] nsDocumentOpenInfo::TryContentListener; mFlags = 0x%x",
this, mFlags));
NS_PRECONDITION(aListener, "Must have a non-null listener");
NS_PRECONDITION(aChannel, "Must have a channel");
PRBool listenerWantsContent = PR_FALSE;
nsXPIDLCString typeToUse;
if (mFlags & nsIURILoader::IS_CONTENT_PREFERRED) {
aListener->IsPreferred(mContentType.get(),
getter_Copies(typeToUse),
&listenerWantsContent);
} else {
aListener->CanHandleContent(mContentType.get(), PR_FALSE,
getter_Copies(typeToUse),
&listenerWantsContent);
}
if (!listenerWantsContent) {
LOG((" Listener is not interested"));
return PR_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 = nsnull;
}
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 != nsnull;
}
// 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);
PRBool abort = PR_FALSE;
PRBool isPreferred = (mFlags & nsIURILoader::IS_CONTENT_PREFERRED) != 0;
nsresult rv = aListener->DoContent(mContentType.get(),
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 = nsnull;
return PR_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 = nsnull;
}
NS_ASSERTION(abort || m_targetStreamListener, "DoContent returned no listener?");
// aListener is handling the load from this point on.
return PR_TRUE;
}
///////////////////////////////////////////////////////////////////////////////////////////////
// Implementation of nsURILoader
///////////////////////////////////////////////////////////////////////////////////////////////
nsURILoader::nsURILoader()
{
#ifdef PR_LOGGING
if (!mLog) {
mLog = PR_NewLogModule("URILoader");
}
#endif
}
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,
PRBool aIsContentPreferred,
nsIInterfaceRequestor *aWindowContext)
{
NS_ENSURE_ARG_POINTER(channel);
#ifdef PR_LOGGING
if (LOG_ENABLED()) {
nsCOMPtr<nsIURI> uri;
channel->GetURI(getter_AddRefs(uri));
nsCAutoString spec;
uri->GetAsciiSpec(spec);
LOG(("nsURILoader::OpenURI for %s", spec.get()));
}
#endif
nsCOMPtr<nsIStreamListener> loader;
nsresult rv = OpenChannel(channel,
aIsContentPreferred ? IS_CONTENT_PREFERRED : 0,
aWindowContext,
PR_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->AsyncOpen(loader, nsnull);
// 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,
PRUint32 aFlags,
nsIInterfaceRequestor* aWindowContext,
PRBool aChannelIsOpen,
nsIStreamListener** aListener)
{
NS_ASSERTION(channel, "Trying to open a null channel!");
NS_ASSERTION(aWindowContext, "Window context must not be null");
#ifdef PR_LOGGING
if (LOG_ENABLED()) {
nsCOMPtr<nsIURI> uri;
channel->GetURI(getter_AddRefs(uri));
nsCAutoString spec;
uri->GetAsciiSpec(spec);
LOG(("nsURILoader::OpenChannel for %s", spec.get()));
}
#endif
// 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) {
PRBool doAbort = PR_FALSE;
winContextListener->OnStartURIOpen(uri, &doAbort);
if (doAbort) {
LOG((" OnStartURIOpen aborted load"));
return NS_ERROR_WONT_HANDLE_CONTENT;
}
}
}
// we need to create a DocumentOpenInfo object which will go ahead and open
// the url and discover the content type....
nsCOMPtr<nsDocumentOpenInfo> loader =
new nsDocumentOpenInfo(aWindowContext, aFlags, this);
if (!loader) return NS_ERROR_OUT_OF_MEMORY;
// 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) {
nsRefPtr<nsDocLoader> newDocLoader = new nsDocLoader();
if (!newDocLoader)
return NS_ERROR_OUT_OF_MEMORY;
nsresult rv = newDocLoader->Init();
if (NS_FAILED(rv))
return rv;
rv = nsDocLoader::AddDocLoaderAsChildOfRoot(newDocLoader);
if (NS_FAILED(rv))
return rv;
listener->SetLoadCookie(nsDocLoader::GetAsSupports(newDocLoader));
}
}
}
// 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, nsnull);
if (oldGroup) {
oldGroup->RemoveRequest(channel, nsnull, 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,
PRUint32 aFlags,
nsIInterfaceRequestor* aWindowContext,
nsIStreamListener** aListener)
{
PRBool pending;
if (NS_FAILED(channel->IsPending(&pending))) {
pending = PR_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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