gecko/uriloader/exthandler/nsExternalProtocolHandler.cpp

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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:
*
2012-05-21 04:12:37 -07:00
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#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;
bool 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(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 = nullptr;
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
nsAutoCString urlScheme;
mUrl->GetScheme(urlScheme);
bool haveHandler = 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 = 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::GetContentDisposition(uint32_t *aContentDisposition)
{
return NS_ERROR_NOT_AVAILABLE;
}
NS_IMETHODIMP nsExtProtocolChannel::SetContentDisposition(uint32_t aContentDisposition)
{
return NS_ERROR_NOT_AVAILABLE;
}
NS_IMETHODIMP nsExtProtocolChannel::GetContentDispositionFilename(nsAString &aContentDispositionFilename)
{
return NS_ERROR_NOT_AVAILABLE;
}
NS_IMETHODIMP nsExtProtocolChannel::SetContentDispositionFilename(const nsAString &aContentDispositionFilename)
{
return NS_ERROR_NOT_AVAILABLE;
}
NS_IMETHODIMP nsExtProtocolChannel::GetContentDispositionHeader(nsACString &aContentDispositionHeader)
{
return NS_ERROR_NOT_AVAILABLE;
}
NS_IMETHODIMP nsExtProtocolChannel::GetContentLength(int64_t * aContentLength)
{
*aContentLength = -1;
return NS_OK;
}
NS_IMETHODIMP
nsExtProtocolChannel::SetContentLength(int64_t 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(bool *result)
{
*result = 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(int32_t *aDefaultPort)
{
*aDefaultPort = 0;
return NS_OK;
}
NS_IMETHODIMP
nsExternalProtocolHandler::AllowPort(int32_t port, const char *scheme, bool *_retval)
{
// don't override anything.
*_retval = false;
return NS_OK;
}
// returns TRUE if the OS can handle this protocol scheme and false otherwise.
bool nsExternalProtocolHandler::HaveExternalProtocolHandler(nsIURI * aURI)
{
bool haveHandler = false;
if (aURI)
{
nsAutoCString scheme;
aURI->GetScheme(scheme);
nsCOMPtr<nsIExternalProtocolService> extProtSvc(do_GetService(NS_EXTERNALPROTOCOLSERVICE_CONTRACTID));
if (extProtSvc)
extProtSvc->ExternalProtocolHandlerExists(scheme.get(), &haveHandler);
}
return haveHandler;
}
NS_IMETHODIMP nsExternalProtocolHandler::GetProtocolFlags(uint32_t *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.)
bool 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, bool *_retval)
{
nsCOMPtr<nsIExternalProtocolService> extProtSvc(do_GetService(NS_EXTERNALPROTOCOLSERVICE_CONTRACTID));
if (extProtSvc)
return extProtSvc->ExternalProtocolHandlerExists(
PromiseFlatCString(aScheme).get(), _retval);
// In case we don't have external protocol service.
*_retval = false;
return NS_OK;
}