gecko-dev/uriloader/exthandler/nsExternalProtocolHandler.cpp
2010-08-30 13:20:39 -07:00

434 lines
12 KiB
C++

/* -*- 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) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Scott MacGregor <mscott@netscape.com>
* Dan Mosedale <dmose@mozilla.org>
*
* 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 "nsIURI.h"
#include "nsIURL.h"
#include "nsExternalProtocolHandler.h"
#include "nsXPIDLString.h"
#include "nsReadableUtils.h"
#include "nsCOMPtr.h"
#include "nsIServiceManager.h"
#include "nsServiceManagerUtils.h"
#include "nsIInterfaceRequestor.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsIStringBundle.h"
#include "nsIPrefService.h"
#include "nsIPrompt.h"
#include "nsNetUtil.h"
#include "nsExternalHelperAppService.h"
// used to dispatch urls to default protocol handlers
#include "nsCExternalHandlerService.h"
#include "nsIExternalProtocolService.h"
////////////////////////////////////////////////////////////////////////
// a stub channel implemenation which will map calls to AsyncRead and OpenInputStream
// to calls in the OS for loading the url.
////////////////////////////////////////////////////////////////////////
class nsExtProtocolChannel : public nsIChannel
{
public:
NS_DECL_ISUPPORTS
NS_DECL_NSICHANNEL
NS_DECL_NSIREQUEST
nsExtProtocolChannel();
virtual ~nsExtProtocolChannel();
nsresult SetURI(nsIURI*);
private:
nsresult OpenURL();
void Finish(nsresult aResult);
nsCOMPtr<nsIURI> mUrl;
nsCOMPtr<nsIURI> mOriginalURI;
nsresult mStatus;
nsLoadFlags mLoadFlags;
PRBool mWasOpened;
nsCOMPtr<nsIInterfaceRequestor> mCallbacks;
nsCOMPtr<nsILoadGroup> mLoadGroup;
};
NS_IMPL_THREADSAFE_ADDREF(nsExtProtocolChannel)
NS_IMPL_THREADSAFE_RELEASE(nsExtProtocolChannel)
NS_INTERFACE_MAP_BEGIN(nsExtProtocolChannel)
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIChannel)
NS_INTERFACE_MAP_ENTRY(nsIChannel)
NS_INTERFACE_MAP_ENTRY(nsIRequest)
NS_INTERFACE_MAP_END_THREADSAFE
nsExtProtocolChannel::nsExtProtocolChannel() : mStatus(NS_OK),
mWasOpened(PR_FALSE)
{
}
nsExtProtocolChannel::~nsExtProtocolChannel()
{}
NS_IMETHODIMP nsExtProtocolChannel::GetLoadGroup(nsILoadGroup * *aLoadGroup)
{
NS_IF_ADDREF(*aLoadGroup = mLoadGroup);
return NS_OK;
}
NS_IMETHODIMP nsExtProtocolChannel::SetLoadGroup(nsILoadGroup * aLoadGroup)
{
mLoadGroup = aLoadGroup;
return NS_OK;
}
NS_IMETHODIMP nsExtProtocolChannel::GetNotificationCallbacks(nsIInterfaceRequestor* *aCallbacks)
{
NS_IF_ADDREF(*aCallbacks = mCallbacks);
return NS_OK;
}
NS_IMETHODIMP nsExtProtocolChannel::SetNotificationCallbacks(nsIInterfaceRequestor* aCallbacks)
{
mCallbacks = aCallbacks;
return NS_OK;
}
NS_IMETHODIMP
nsExtProtocolChannel::GetSecurityInfo(nsISupports * *aSecurityInfo)
{
*aSecurityInfo = nsnull;
return NS_OK;
}
NS_IMETHODIMP nsExtProtocolChannel::GetOriginalURI(nsIURI* *aURI)
{
NS_ADDREF(*aURI = mOriginalURI);
return NS_OK;
}
NS_IMETHODIMP nsExtProtocolChannel::SetOriginalURI(nsIURI* aURI)
{
NS_ENSURE_ARG_POINTER(aURI);
mOriginalURI = aURI;
return NS_OK;
}
NS_IMETHODIMP nsExtProtocolChannel::GetURI(nsIURI* *aURI)
{
*aURI = mUrl;
NS_IF_ADDREF(*aURI);
return NS_OK;
}
nsresult nsExtProtocolChannel::SetURI(nsIURI* aURI)
{
mUrl = aURI;
return NS_OK;
}
nsresult nsExtProtocolChannel::OpenURL()
{
nsresult rv = NS_ERROR_FAILURE;
nsCOMPtr<nsIExternalProtocolService> extProtService (do_GetService(NS_EXTERNALPROTOCOLSERVICE_CONTRACTID));
if (extProtService)
{
#ifdef DEBUG
nsCAutoString urlScheme;
mUrl->GetScheme(urlScheme);
PRBool haveHandler = PR_FALSE;
extProtService->ExternalProtocolHandlerExists(urlScheme.get(), &haveHandler);
NS_ASSERTION(haveHandler, "Why do we have a channel for this url if we don't support the protocol?");
#endif
nsCOMPtr<nsIInterfaceRequestor> aggCallbacks;
rv = NS_NewNotificationCallbacksAggregation(mCallbacks, mLoadGroup,
getter_AddRefs(aggCallbacks));
if (NS_FAILED(rv)) {
goto finish;
}
rv = extProtService->LoadURI(mUrl, aggCallbacks);
if (NS_SUCCEEDED(rv)) {
// despite success, we need to abort this channel, at the very least
// to make it clear to the caller that no on{Start,Stop}Request
// should be expected.
rv = NS_ERROR_NO_CONTENT;
}
}
finish:
mCallbacks = 0;
return rv;
}
NS_IMETHODIMP nsExtProtocolChannel::Open(nsIInputStream **_retval)
{
return OpenURL();
}
NS_IMETHODIMP nsExtProtocolChannel::AsyncOpen(nsIStreamListener *listener, nsISupports *ctxt)
{
NS_ENSURE_ARG_POINTER(listener);
NS_ENSURE_TRUE(!mWasOpened, NS_ERROR_ALREADY_OPENED);
mWasOpened = PR_TRUE;
return OpenURL();
}
NS_IMETHODIMP nsExtProtocolChannel::GetLoadFlags(nsLoadFlags *aLoadFlags)
{
*aLoadFlags = mLoadFlags;
return NS_OK;
}
NS_IMETHODIMP nsExtProtocolChannel::SetLoadFlags(nsLoadFlags aLoadFlags)
{
mLoadFlags = aLoadFlags;
return NS_OK;
}
NS_IMETHODIMP nsExtProtocolChannel::GetContentType(nsACString &aContentType)
{
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP nsExtProtocolChannel::SetContentType(const nsACString &aContentType)
{
return NS_ERROR_FAILURE;
}
NS_IMETHODIMP nsExtProtocolChannel::GetContentCharset(nsACString &aContentCharset)
{
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP nsExtProtocolChannel::SetContentCharset(const nsACString &aContentCharset)
{
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP nsExtProtocolChannel::GetContentLength(PRInt32 * aContentLength)
{
*aContentLength = -1;
return NS_OK;
}
NS_IMETHODIMP
nsExtProtocolChannel::SetContentLength(PRInt32 aContentLength)
{
NS_NOTREACHED("SetContentLength");
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP nsExtProtocolChannel::GetOwner(nsISupports * *aPrincipal)
{
NS_NOTREACHED("GetOwner");
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP nsExtProtocolChannel::SetOwner(nsISupports * aPrincipal)
{
NS_NOTREACHED("SetOwner");
return NS_ERROR_NOT_IMPLEMENTED;
}
////////////////////////////////////////////////////////////////////////////////
// From nsIRequest
////////////////////////////////////////////////////////////////////////////////
NS_IMETHODIMP nsExtProtocolChannel::GetName(nsACString &result)
{
return mUrl->GetSpec(result);
}
NS_IMETHODIMP nsExtProtocolChannel::IsPending(PRBool *result)
{
*result = PR_FALSE;
return NS_OK;
}
NS_IMETHODIMP nsExtProtocolChannel::GetStatus(nsresult *status)
{
*status = mStatus;
return NS_OK;
}
NS_IMETHODIMP nsExtProtocolChannel::Cancel(nsresult status)
{
mStatus = status;
return NS_OK;
}
NS_IMETHODIMP nsExtProtocolChannel::Suspend()
{
NS_NOTREACHED("Suspend");
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP nsExtProtocolChannel::Resume()
{
NS_NOTREACHED("Resume");
return NS_ERROR_NOT_IMPLEMENTED;
}
///////////////////////////////////////////////////////////////////////
// the default protocol handler implementation
//////////////////////////////////////////////////////////////////////
nsExternalProtocolHandler::nsExternalProtocolHandler()
{
m_schemeName = "default";
}
nsExternalProtocolHandler::~nsExternalProtocolHandler()
{}
NS_IMPL_THREADSAFE_ADDREF(nsExternalProtocolHandler)
NS_IMPL_THREADSAFE_RELEASE(nsExternalProtocolHandler)
NS_INTERFACE_MAP_BEGIN(nsExternalProtocolHandler)
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIProtocolHandler)
NS_INTERFACE_MAP_ENTRY(nsIProtocolHandler)
NS_INTERFACE_MAP_ENTRY(nsIExternalProtocolHandler)
NS_INTERFACE_MAP_ENTRY(nsISupportsWeakReference)
NS_INTERFACE_MAP_END_THREADSAFE
NS_IMETHODIMP nsExternalProtocolHandler::GetScheme(nsACString &aScheme)
{
aScheme = m_schemeName;
return NS_OK;
}
NS_IMETHODIMP nsExternalProtocolHandler::GetDefaultPort(PRInt32 *aDefaultPort)
{
*aDefaultPort = 0;
return NS_OK;
}
NS_IMETHODIMP
nsExternalProtocolHandler::AllowPort(PRInt32 port, const char *scheme, PRBool *_retval)
{
// don't override anything.
*_retval = PR_FALSE;
return NS_OK;
}
// returns TRUE if the OS can handle this protocol scheme and false otherwise.
PRBool nsExternalProtocolHandler::HaveExternalProtocolHandler(nsIURI * aURI)
{
PRBool haveHandler = PR_FALSE;
if (aURI)
{
nsCAutoString scheme;
aURI->GetScheme(scheme);
if (gExtProtSvc)
gExtProtSvc->ExternalProtocolHandlerExists(scheme.get(), &haveHandler);
}
return haveHandler;
}
NS_IMETHODIMP nsExternalProtocolHandler::GetProtocolFlags(PRUint32 *aUritype)
{
// Make it norelative since it is a simple uri
*aUritype = URI_NORELATIVE | URI_NOAUTH | URI_LOADABLE_BY_ANYONE |
URI_NON_PERSISTABLE | URI_DOES_NOT_RETURN_DATA;
return NS_OK;
}
NS_IMETHODIMP nsExternalProtocolHandler::NewURI(const nsACString &aSpec,
const char *aCharset, // ignore charset info
nsIURI *aBaseURI,
nsIURI **_retval)
{
nsresult rv;
nsCOMPtr<nsIURI> uri = do_CreateInstance(NS_SIMPLEURI_CONTRACTID, &rv);
NS_ENSURE_SUCCESS(rv, rv);
rv = uri->SetSpec(aSpec);
NS_ENSURE_SUCCESS(rv, rv);
NS_ADDREF(*_retval = uri);
return NS_OK;
}
NS_IMETHODIMP nsExternalProtocolHandler::NewChannel(nsIURI *aURI, nsIChannel **_retval)
{
// Only try to return a channel if we have a protocol handler for the url.
// nsOSHelperAppService::LoadUriInternal relies on this to check trustedness
// for some platforms at least. (win uses ::ShellExecute and unix uses
// gnome_url_show.)
PRBool haveExternalHandler = HaveExternalProtocolHandler(aURI);
if (haveExternalHandler)
{
nsCOMPtr<nsIChannel> channel = new nsExtProtocolChannel();
if (!channel) return NS_ERROR_OUT_OF_MEMORY;
((nsExtProtocolChannel*) channel.get())->SetURI(aURI);
channel->SetOriginalURI(aURI);
if (_retval)
{
*_retval = channel;
NS_IF_ADDREF(*_retval);
return NS_OK;
}
}
return NS_ERROR_UNKNOWN_PROTOCOL;
}
///////////////////////////////////////////////////////////////////////
// External protocol handler interface implementation
//////////////////////////////////////////////////////////////////////
NS_IMETHODIMP nsExternalProtocolHandler::ExternalAppExistsForScheme(const nsACString& aScheme, PRBool *_retval)
{
if (gExtProtSvc)
return gExtProtSvc->ExternalProtocolHandlerExists(
PromiseFlatCString(aScheme).get(), _retval);
// In case we don't have external protocol service.
*_retval = PR_FALSE;
return NS_OK;
}