gecko-dev/uriloader/exthandler/nsExternalProtocolHandler.cpp

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8.7 KiB
C++

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* The contents of this file are subject to the Netscape Public License
* Version 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*
* Contributor(s):
* Scott MacGregor <mscott@netscape.com>
*
*/
#include "nsIURI.h"
#include "nsIURL.h"
#include "nsExternalProtocolHandler.h"
#include "nsXPIDLString.h"
#include "nsReadableUtils.h"
#include "nsCOMPtr.h"
#include "nsIServiceManager.h"
#include "nsNetCID.h"
// used to dispatch urls to default protocol handlers
#include "nsCExternalHandlerService.h"
#include "nsIExternalProtocolService.h"
static NS_DEFINE_CID(kSimpleURICID, NS_SIMPLEURI_CID);
////////////////////////////////////////////////////////////////////////
// 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*);
protected:
nsCOMPtr<nsIURI> mUrl;
nsresult mStatus;
nsresult OpenURL();
};
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)
{
NS_INIT_ISUPPORTS();
}
nsExtProtocolChannel::~nsExtProtocolChannel()
{}
NS_IMETHODIMP nsExtProtocolChannel::GetLoadGroup(nsILoadGroup * *aLoadGroup)
{
*aLoadGroup = nsnull;
return NS_OK;
}
NS_IMETHODIMP nsExtProtocolChannel::SetLoadGroup(nsILoadGroup * aLoadGroup)
{
return NS_OK;
}
NS_IMETHODIMP nsExtProtocolChannel::GetNotificationCallbacks(nsIInterfaceRequestor* *aNotificationCallbacks)
{
*aNotificationCallbacks = nsnull;
return NS_OK;
}
NS_IMETHODIMP nsExtProtocolChannel::SetNotificationCallbacks(nsIInterfaceRequestor* aNotificationCallbacks)
{
return NS_OK; // don't fail when trying to set this
}
NS_IMETHODIMP
nsExtProtocolChannel::GetSecurityInfo(nsISupports * *aSecurityInfo)
{
*aSecurityInfo = nsnull;
return NS_OK;
}
NS_IMETHODIMP nsExtProtocolChannel::GetOriginalURI(nsIURI* *aURI)
{
*aURI = nsnull;
return NS_OK;
}
NS_IMETHODIMP nsExtProtocolChannel::SetOriginalURI(nsIURI* 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()
{
nsCOMPtr<nsIExternalProtocolService> extProtService (do_GetService(NS_EXTERNALPROTOCOLSERVICE_CONTRACTID));
PRBool haveHandler = PR_FALSE;
nsXPIDLCString urlScheme;
mUrl->GetScheme(getter_Copies(urlScheme));
if (extProtService)
{
extProtService->ExternalProtocolHandlerExists(urlScheme, &haveHandler);
if (haveHandler)
return extProtService->LoadUrl(mUrl);
}
return NS_ERROR_FAILURE;
}
NS_IMETHODIMP nsExtProtocolChannel::Open(nsIInputStream **_retval)
{
OpenURL(); // force caller to abort.
return NS_ERROR_FAILURE; // force caller to abort.
}
NS_IMETHODIMP nsExtProtocolChannel::AsyncOpen(nsIStreamListener *listener, nsISupports *ctxt)
{
OpenURL();
return NS_ERROR_FAILURE; // force caller to abort.
}
NS_IMETHODIMP nsExtProtocolChannel::GetLoadFlags(nsLoadFlags *aLoadFlags)
{
*aLoadFlags = 0;
return NS_OK;
}
NS_IMETHODIMP nsExtProtocolChannel::SetLoadFlags(nsLoadFlags aLoadFlags)
{
return NS_OK;
}
NS_IMETHODIMP nsExtProtocolChannel::GetContentType(char * *aContentType)
{
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP nsExtProtocolChannel::SetContentType(const char *aContentType)
{
return NS_ERROR_FAILURE;
}
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(PRUnichar* *result)
{
NS_NOTREACHED("nsExtProtocolChannel::GetName");
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP nsExtProtocolChannel::IsPending(PRBool *result)
{
*result = PR_TRUE;
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()
{
NS_INIT_REFCNT();
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(nsISupportsWeakReference)
NS_INTERFACE_MAP_END_THREADSAFE
NS_IMETHODIMP nsExternalProtocolHandler::GetScheme(char * *aScheme)
{
*aScheme = ToNewCString(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::HaveProtocolHandler(nsIURI * aURI)
{
PRBool haveHandler = PR_FALSE;
nsXPIDLCString scheme;
if (aURI)
{
aURI->GetScheme(getter_Copies(scheme));
nsCOMPtr<nsIExternalProtocolService> extProtService (do_GetService(NS_EXTERNALPROTOCOLSERVICE_CONTRACTID));
extProtService->ExternalProtocolHandlerExists(scheme, &haveHandler);
}
return haveHandler;
}
NS_IMETHODIMP nsExternalProtocolHandler::GetProtocolFlags(PRUint32 *aUritype)
{
// Make it norelative since it is a simple uri
*aUritype = URI_NORELATIVE;
return NS_OK;
}
NS_IMETHODIMP nsExternalProtocolHandler::NewURI(const char *aSpec, nsIURI *aBaseURI, nsIURI **_retval)
{
nsresult rv = NS_ERROR_UNKNOWN_PROTOCOL;
nsCOMPtr<nsIURI> uri = do_CreateInstance(kSimpleURICID, &rv);
if (uri)
{
uri->SetSpec(aSpec);
PRBool haveHandler = HaveProtocolHandler(uri);
if (haveHandler)
{
*_retval = uri;
NS_IF_ADDREF(*_retval);
return NS_OK;
}
}
return NS_ERROR_UNKNOWN_PROTOCOL;
}
NS_IMETHODIMP nsExternalProtocolHandler::NewChannel(nsIURI *aURI, nsIChannel **_retval)
{
// only try to return a channel if we have a protocol handler for the url
PRBool haveHandler = HaveProtocolHandler(aURI);
if (haveHandler)
{
nsCOMPtr<nsIChannel> channel;
NS_NEWXPCOM(channel, nsExtProtocolChannel);
if (!channel) return NS_ERROR_OUT_OF_MEMORY;
((nsExtProtocolChannel*) channel.get())->SetURI(aURI);
if (_retval)
{
*_retval = channel;
NS_IF_ADDREF(*_retval);
return NS_OK;
}
}
return NS_ERROR_UNKNOWN_PROTOCOL;
}