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RetroZilla/uriloader/base/nsURILoader.cpp
Ryan Nematz 2f2ae146c0 first commit
2015-10-20 23:03:22 -04:00

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode:nil; c-basic-offset: 2 -*- */
/* ***** 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"
static NS_DEFINE_CID(kStreamConverterServiceCID, NS_STREAMCONVERTERSERVICE_CID);
#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
nsDocumentOpenInfo(nsIInterfaceRequestor* aWindowContext,
PRBool aIsContentPreferred,
nsURILoader* aURILoader);
NS_DECL_ISUPPORTS
nsresult Open(nsIChannel* channel);
// 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;
/**
* Boolean to pass to CanHandleContent (also determines whether we
* use CanHandleContent or IsPreferred).
*/
PRBool mIsContentPreferred;
/**
* 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,
PRBool aIsContentPreferred,
nsURILoader* aURILoader)
: m_originalContext(aWindowContext),
mIsContentPreferred(aIsContentPreferred),
mURILoader(aURILoader)
{
}
nsDocumentOpenInfo::~nsDocumentOpenInfo()
{
}
nsresult nsDocumentOpenInfo::Open(nsIChannel *aChannel)
{
LOG(("[0x%p] nsDocumentOpenInfo::Open", this));
// 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....
nsresult rv;
// ask our window context if it has a uri content listener...
m_contentListener = do_GetInterface(m_originalContext, &rv);
if (NS_FAILED(rv)) return rv;
// now just open the channel!
rv = aChannel->AsyncOpen(this, nsnull);
// no content from this load - that's OK.
if (rv == NS_ERROR_DOM_RETVAL_UNDEFINED ||
rv == NS_ERROR_NO_CONTENT) {
LOG((" rv is NS_ERROR_DOM_RETVAL_UNDEFINED or NS_ERROR_NO_CONTENT -- doing nothing"));
rv = NS_OK;
}
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;
}
//
// 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;
}
}
}
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;
}
}
// 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(kStreamConverterServiceCID, &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, mIsContentPreferred, 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; mIsContentPreferred = %s",
this, mIsContentPreferred ? "true" : "false"));
NS_PRECONDITION(aListener, "Must have a non-null listener");
NS_PRECONDITION(aChannel, "Must have a channel");
PRBool listenerWantsContent = PR_FALSE;
nsXPIDLCString typeToUse;
if (mIsContentPreferred) {
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;
nsresult rv = aListener->DoContent(mContentType.get(),
mIsContentPreferred,
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
// 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_OK;
}
}
}
// 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, aIsContentPreferred, 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));
}
}
}
channel->SetLoadGroup(loadGroup);
// now instruct the loader to go ahead and open the url
return loader->Open(channel);
}
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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