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pjs/uriloader/base/nsURILoader.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode:nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: NPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Netscape 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/NPL/
*
* 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 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 NPL, 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 NPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsURILoader.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"
static NS_DEFINE_CID(kStreamConverterServiceCID, NS_STREAMCONVERTERSERVICE_CID);
/**
* 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(nsISupports* aWindowContext,
PRBool aIsContentPreferred);
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,
const nsACString & aSrcContentType,
const nsACString & aOutContentType);
// nsIRequestObserver methods:
NS_DECL_NSIREQUESTOBSERVER
// nsIStreamListener methods:
NS_DECL_NSISTREAMLISTENER
protected:
virtual ~nsDocumentOpenInfo();
protected:
nsCOMPtr<nsIURIContentListener> m_contentListener;
nsCOMPtr<nsIStreamListener> m_targetStreamListener;
nsCOMPtr<nsISupports> m_originalContext;
PRBool mIsContentPreferred;
};
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(nsISupports* aWindowContext,
PRBool aIsContentPreferred)
: m_originalContext(aWindowContext),
mIsContentPreferred(aIsContentPreferred)
{
}
nsDocumentOpenInfo::~nsDocumentOpenInfo()
{
}
nsresult nsDocumentOpenInfo::Open(nsIChannel *aChannel)
{
// 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!
if (aChannel){
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) {
rv = NS_OK;
}
return rv;
}
NS_IMETHODIMP nsDocumentOpenInfo::OnStartRequest(nsIRequest *request, nsISupports * aCtxt)
{
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. Just return. This causes the request to be
// ignored.
//
nsCOMPtr<nsIHttpChannel> httpChannel(do_QueryInterface(request, &rv));
if (NS_SUCCEEDED(rv)) {
PRUint32 responseCode = 0;
rv = httpChannel->GetResponseStatus(&responseCode);
if (NS_FAILED(rv)) {
// behave as in the canceled case
return NS_OK;
}
if (204 == responseCode || 205 == responseCode) {
return NS_OK;
}
}
//
// 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)) {
//
// 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);
if (m_targetStreamListener)
rv = m_targetStreamListener->OnStartRequest(request, aCtxt);
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)
{
if ( m_targetStreamListener)
{
nsCOMPtr<nsIStreamListener> listener(m_targetStreamListener);
m_targetStreamListener = 0;
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)
{
nsresult rv;
nsCOMPtr<nsIChannel> aChannel = do_QueryInterface(request);
if (!aChannel) {
return NS_ERROR_FAILURE;
}
nsCAutoString contentType;
rv = aChannel->GetContentType(contentType);
if (NS_FAILED(rv)) return rv;
// go to the uri dispatcher and give them our stuff...
nsCOMPtr<nsIURILoader> uriLoader;
uriLoader = do_GetService(NS_URI_LOADER_CONTRACTID, &rv);
if (NS_FAILED(rv)) {
return rv;
}
// 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));
if (httpChannel)
{
rv = httpChannel->GetResponseHeader(NS_LITERAL_CSTRING("content-disposition"),
disposition);
}
else
{
nsCOMPtr<nsIMultiPartChannel> multipartChannel(do_QueryInterface(request));
if (multipartChannel)
{
rv = multipartChannel->GetContentDisposition(disposition);
}
}
if (NS_SUCCEEDED(rv) && !disposition.IsEmpty())
{
nsCOMPtr<nsIMIMEHeaderParam> mimehdrpar = do_GetService(NS_MIMEHEADERPARAM_CONTRACTID, &rv);
if (NS_SUCCEEDED(rv))
{
nsAutoString dispToken;
// Get the disposition type
rv = mimehdrpar->GetParameter(disposition, "", NS_LITERAL_CSTRING(""),
PR_FALSE, nsnull, dispToken);
// RFC 2183, section 2.8 says that an unknown disposition
// value should be treated as "attachment"
if (NS_FAILED(rv) ||
(!dispToken.EqualsIgnoreCase("inline") &&
// Broken sites just send
// Content-Disposition: filename="file"
// without a disposition token... screen those out.
!dispToken.EqualsIgnoreCase("filename", 8)))
// We have a content-disposition of "attachment" or unknown
forceExternalHandling = PR_TRUE;
}
}
// 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 if any nsIURIContentListener prefers to handle this
// content type, passing m_contentListener as the first
// listener to try.
//
PRBool abortDispatch = PR_FALSE;
rv = uriLoader->DispatchContent(contentType.get(),
mIsContentPreferred,
request, aCtxt,
m_contentListener,
m_originalContext,
getter_Copies(desiredContentType),
getter_AddRefs(contentListener),
&abortDispatch);
// if the uri loader says to abort the dispatch then someone
// else must have stepped in and taken over for us...so stop..
if (abortDispatch) return NS_OK;
}
//
// Second step: If no listener prefers this type, see if any stream
// decoders 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.
NS_NAMED_LITERAL_CSTRING(anyType, "*/*");
if (!contentListener && contentType != anyType)
{
ConvertData(request, contentType, anyType);
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.
return NS_OK;
}
}
// Step 3:
//
// Now we try to get an actual downstream nsIStreamListener to give data to.
nsCOMPtr<nsIStreamListener> contentStreamListener;
if (contentListener)
{
// We need to first figure out if we are retargeting the load
// to a content listener that is different from the one that
// originated the request....if so, set
// LOAD_RETARGETED_DOCUMENT_URI on the channel.
if (contentListener != m_contentListener)
{
// we must be retargeting...so set an appropriate flag on
// the channel
nsLoadFlags loadFlags = 0;
aChannel->GetLoadFlags(&loadFlags);
loadFlags |= nsIChannel::LOAD_RETARGETED_DOCUMENT_URI;
aChannel->SetLoadFlags(loadFlags);
}
const char* contentTypeToUse;
if (desiredContentType)
contentTypeToUse = desiredContentType.get();
else
contentTypeToUse = contentType.get();
PRBool bAbortProcess = PR_FALSE;
rv = contentListener->DoContent(contentTypeToUse,
mIsContentPreferred,
request,
getter_AddRefs(contentStreamListener),
&bAbortProcess);
// Do not continue loading if nsIURIContentListener::DoContent(...)
// fails - It means that an unexpected error occurred...
//
// If bAbortProcess is TRUE then the listener is doing all the work from
// here...we are done!!!
if (NS_FAILED(rv) || bAbortProcess) {
return rv;
}
}
if (!contentStreamListener)
{
// Step 4:
//
// 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)
{
rv = helperAppService->DoContent(contentType.get(),
request,
m_originalContext,
getter_AddRefs(contentStreamListener));
if (NS_SUCCEEDED(rv) && contentStreamListener) {
m_targetStreamListener = contentStreamListener;
return NS_OK;
}
}
}
if (!contentStreamListener) {
// Something failed somewhere.... Otherwise the helper app service would
// have taken over by now.
NS_ASSERTION(NS_FAILED(rv),
"There is no way we should be successful at this point");
return rv;
}
if (desiredContentType.IsEmpty() ||
contentType == desiredContentType ||
contentType == anyType) {
// All set. Just use this contentStreamListener
m_targetStreamListener = contentStreamListener;
return NS_OK;
}
// Now we have to convert. Set m_contentListener to contentListener so that
// the downstream nsDocumentOpenInfo will try that listener first (since
// this contentListener expressed interest in handling the decoded version
// of this data).
m_contentListener = contentListener;
// OK, now bounce the data over to contentStreamListener.
rv = ConvertData(request, contentType, desiredContentType);
// Reinitialize our content listener in case this is a multipart stream --
// we wouldn't want to hand over a different part of the stream to the same
// content listener as wanted this part.
m_contentListener = do_GetInterface(m_originalContext);
return rv;
}
nsresult
nsDocumentOpenInfo::ConvertData(nsIRequest *request,
const nsACString& aSrcContentType,
const nsACString& aOutContentType)
{
NS_PRECONDITION(aSrcContentType != aOutContentType,
"RetargetOutput 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;
NS_ConvertASCIItoUCS2 from_w(aSrcContentType);
NS_ConvertASCIItoUCS2 to_w(aOutContentType);
// 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);
if (!nextLink) return NS_ERROR_OUT_OF_MEMORY;
// Make sure nextLink starts with the contentListener that said it wanted the
// results of this decode.
nextLink->m_contentListener = m_contentListener;
// Also make sure it has to look for a stream listener to pump data into.
nextLink->m_targetStreamListener = nsnull;
// 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(from_w.get(),
to_w.get(),
nextLink,
request,
getter_AddRefs(m_targetStreamListener));
}
///////////////////////////////////////////////////////////////////////////////////////////////
// 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,
PRBool aIsContentPreferred,
nsISupports * aWindowContext)
{
NS_ENSURE_ARG_POINTER(channel);
// 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) {
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);
if (!loader) return NS_ERROR_OUT_OF_MEMORY;
nsCOMPtr<nsIInterfaceRequestor> loadCookie;
SetupLoadCookie(aWindowContext, getter_AddRefs(loadCookie));
// 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;
}
NS_IMETHODIMP
nsURILoader::GetLoadGroupForContext(nsISupports * aWindowContext,
nsILoadGroup ** aLoadGroup)
{
nsresult rv;
nsCOMPtr<nsIInterfaceRequestor> loadCookieForWindow;
// Initialize the [out] parameter...
*aLoadGroup= nsnull;
NS_ENSURE_ARG(aWindowContext);
rv = SetupLoadCookie(aWindowContext, getter_AddRefs(loadCookieForWindow));
if (NS_FAILED(rv)) return rv;
rv = loadCookieForWindow->GetInterface(NS_GET_IID(nsILoadGroup),
(void **) aLoadGroup);
return rv;
}
NS_IMETHODIMP
nsURILoader::GetDocumentLoaderForContext(nsISupports * aWindowContext,
nsIDocumentLoader ** aDocLoader)
{
nsresult rv;
nsCOMPtr<nsIInterfaceRequestor> loadCookieForWindow;
// Initialize the [out] parameter...
*aDocLoader = nsnull;
NS_ENSURE_ARG(aWindowContext);
rv = SetupLoadCookie(aWindowContext, getter_AddRefs(loadCookieForWindow));
if (NS_FAILED(rv)) return rv;
rv = loadCookieForWindow->GetInterface(NS_GET_IID(nsIDocumentLoader),
(void **) aDocLoader);
return rv;
}
nsresult nsURILoader::SetupLoadCookie(nsISupports * aWindowContext,
nsIInterfaceRequestor ** aLoadCookie)
{
// first, see if we have already set a load cookie on the cnt listener..
// i.e. if this isn't the first time we've tried to run a url through this window
// context then we don't need to create another load cookie, we can reuse the first one.
nsresult rv = NS_OK;
nsCOMPtr<nsISupports> loadCookie;
// Initialize the [out] parameter...
*aLoadCookie = nsnull;
nsCOMPtr<nsIURIContentListener> cntListener (do_GetInterface(aWindowContext));
if (cntListener) {
// Get the load cookie for the requested window context...
rv = cntListener->GetLoadCookie(getter_AddRefs(loadCookie));
//
// If we don't have a load cookie for this window context yet, then
// go create one! In order to create a load cookie, we need to get
// the parent's load cookie if there is one...
//
if (!loadCookie) {
nsCOMPtr<nsIURIContentListener> parentListener;
nsCOMPtr<nsIDocumentLoader> parentDocLoader;
nsCOMPtr<nsIDocumentLoader> newDocLoader;
// Try to get the parent's load cookie...
cntListener->GetParentContentListener(getter_AddRefs(parentListener));
if (parentListener) {
rv = parentListener->GetLoadCookie(getter_AddRefs(loadCookie));
// if we had a parent cookie use it to help with the creation process
if (loadCookie) {
parentDocLoader = do_GetInterface(loadCookie);
}
}
// If there is no parent DocLoader, then use the global DocLoader
// service as the parent...
if (!parentDocLoader) {
parentDocLoader = do_GetService(NS_DOCUMENTLOADER_SERVICE_CONTRACTID, &rv);
}
if (NS_FAILED(rv)) return rv;
//
// Create a new document loader. The document loader represents
// the load cookie which the uriloader hands out...
//
rv = parentDocLoader->CreateDocumentLoader(getter_AddRefs(newDocLoader));
if (NS_FAILED(rv)) return rv;
newDocLoader->QueryInterface(NS_GET_IID(nsIInterfaceRequestor),
getter_AddRefs(loadCookie));
rv = cntListener->SetLoadCookie(loadCookie);
} // if we don't have a load cookie already
} // if we have a cntListener
// loadCookie may be null - for example, <a target="popupWin"> if popupWin is
// not a defined window. The following prevents a crash (Bug 32898)
if (loadCookie) {
rv = loadCookie->QueryInterface(NS_GET_IID(nsIInterfaceRequestor),
(void**)aLoadCookie);
} else {
rv = NS_ERROR_UNEXPECTED;
}
return rv;
}
PRBool nsURILoader::ShouldHandleContent(nsIURIContentListener * aCntListener,
const char * aContentType,
PRBool aIsContentPreferred,
char ** aContentTypeToUse)
{
PRBool foundContentHandler = PR_FALSE;
if (aIsContentPreferred) {
aCntListener->IsPreferred(aContentType,
aContentTypeToUse,
&foundContentHandler);
} else {
aCntListener->CanHandleContent(aContentType, PR_FALSE,
aContentTypeToUse,
&foundContentHandler);
}
return foundContentHandler;
}
NS_IMETHODIMP nsURILoader::DispatchContent(const char * aContentType,
PRBool aIsContentPreferred,
nsIRequest *request,
nsISupports * aCtxt,
nsIURIContentListener * aContentListener,
nsISupports * aSrcWindowContext,
char ** aContentTypeToUse,
nsIURIContentListener ** aContentListenerToUse,
PRBool * aAbortProcess)
{
NS_ENSURE_ARG_POINTER(aContentType);
NS_ENSURE_ARG_POINTER(request);
NS_PRECONDITION(aAbortProcess, "Null out param!");
NS_PRECONDITION(aContentListenerToUse, "Null out param!");
NS_PRECONDITION(aContentTypeToUse, "Null out param!");
// okay, now we've discovered the content type. We need to do the
// following:
// (1) We always start with the original content listener (if any)
// that originated the request and then ask if it can handle the
// content.
// (2) if it can't, we'll move on to the registered content
// listeners and give them a crack at handling the content.
// (3) if we cannot find a registered content lister to handle the
// type, then we move on to phase II which is to try to find a
// content handler in the registry for the content type.
// hitting this phase usually means we'll be creating a new
// window or handing off to an external application.
nsresult rv = NS_OK;
nsCOMPtr<nsIURIContentListener> listenerToUse = aContentListener;
PRBool foundContentHandler = PR_FALSE;
if (listenerToUse)
foundContentHandler = ShouldHandleContent(listenerToUse,
aContentType,
aIsContentPreferred,
aContentTypeToUse);
// if it can't handle the content, scan through the list of
// registered listeners
if (!foundContentHandler)
{
PRInt32 count = m_listeners.Count();
PRInt32 i;
// keep looping until we get a content listener back
for(i = 0; i < count && !foundContentHandler; i++)
{
//nsIURIContentListener's aren't refcounted.
nsWeakPtr weakListener = m_listeners[i];
nsCOMPtr<nsIURIContentListener> listener(do_QueryReferent(weakListener));
if (listener)
{
foundContentHandler = ShouldHandleContent(listener,
aContentType,
aIsContentPreferred,
aContentTypeToUse);
if (foundContentHandler) {
listenerToUse = listener;
}
} else {
// remove from the listener list, reset i and update count
m_listeners.RemoveObjectAt(i--);
--count;
}
} // for loop
} // if we can't handle the content
if (foundContentHandler && listenerToUse)
{
*aContentListenerToUse = listenerToUse;
NS_IF_ADDREF(*aContentListenerToUse);
return rv;
}
// Try to find a content listener, that had not yet 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, &rv);
if (catman)
{
// see if someone has registered a content listener for aContentType with the category manager...
nsXPIDLCString contractidString;
rv = catman->GetCategoryEntry(NS_CONTENT_LISTENER_CATEGORYMANAGER_ENTRY,
aContentType, getter_Copies(contractidString));
if (NS_SUCCEEDED(rv) && contractidString.get())
{
nsCOMPtr<nsIURIContentListener> listener;
listener = do_CreateInstance(contractidString.get(), &rv);
if (NS_SUCCEEDED(rv)) // we did indeed have a content listener for this type!! yippee...
{
foundContentHandler = ShouldHandleContent(listener, aContentType, aIsContentPreferred, aContentTypeToUse);
if (foundContentHandler && listener)
{
*aContentListenerToUse = listener;
NS_IF_ADDREF(*aContentListenerToUse);
return rv;
}
} // if we were able to create a uri content listener...
} // if we got a valid contract ID
} // if we can get the category manager....
// no registered content listeners to handle this type!!! so go to the register
// and get a registered nsIContentHandler for our content type. Hand it off
// to them...
// eventually we want to hit up the category manager so we can allow people to
// over ride the default content type handlers....for now...i'm skipping that part.
nsCAutoString handlerContractID (NS_CONTENT_HANDLER_CONTRACTID_PREFIX);
handlerContractID += aContentType;
nsCOMPtr<nsIContentHandler> aContentHandler;
aContentHandler = do_CreateInstance(handlerContractID.get(), &rv);
if (NS_SUCCEEDED(rv)) // we did indeed have a content handler for this type!! yippee...
{
rv = aContentHandler->HandleContent(aContentType, "view", aSrcWindowContext, request);
if (rv != NS_ERROR_WONT_HANDLE_CONTENT) {
*aAbortProcess = PR_TRUE;
// The content handler has unexpectedly failed. Cancel the request
// just in case the handler didn't...
if (NS_FAILED(rv)) {
request->Cancel(rv);
}
}
// If WONT_HANDLE_CONTENT is returned -- do not abort. Just return the
// failure and keep looking for another consumer (ie. the unknown
// content handler)...
}
return rv;
}
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