gecko-dev/uriloader/exthandler/nsExternalHelperAppService.h

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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 the Mozilla browser.
*
* The Initial Developer of the Original Code is
* Netscape Communications, Inc.
* Portions created by the Initial Developer are Copyright (C) 1999
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Scott MacGregor <mscott@netscape.com>
* Christian Biesinger <cbiesinger@web.de>
* Dan Mosedale <dmose@mozilla.org>
* Myk Melez <myk@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 ***** */
#ifndef nsExternalHelperAppService_h__
#define nsExternalHelperAppService_h__
#ifdef MOZ_LOGGING
#define FORCE_PR_LOG
#endif
#include "prlog.h"
#include "prtime.h"
#include "nsInt64.h"
#include "nsIExternalHelperAppService.h"
#include "nsIExternalProtocolService.h"
#include "nsIWebProgressListener2.h"
#include "nsIHelperAppLauncherDialog.h"
#include "nsIMIMEInfo.h"
#include "nsMIMEInfoImpl.h"
#include "nsIMIMEService.h"
#include "nsIStreamListener.h"
#include "nsIFile.h"
#include "nsIFileStreams.h"
#include "nsIOutputStream.h"
#include "nsString.h"
#include "nsIInterfaceRequestor.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsILocalFile.h"
#include "nsIChannel.h"
#include "nsITimer.h"
#include "nsIHandlerService.h"
#include "nsCOMPtr.h"
#include "nsIObserver.h"
#include "nsCOMArray.h"
#include "nsWeakReference.h"
#include "nsIPrompt.h"
class nsExternalAppHandler;
class nsIMIMEInfo;
class nsITransfer;
class nsIDOMWindowInternal;
/**
* The helper app service. Responsible for handling content that Mozilla
* itself can not handle
*/
class nsExternalHelperAppService
: public nsIExternalHelperAppService,
public nsPIExternalAppLauncher,
public nsIExternalProtocolService,
public nsIMIMEService,
public nsIObserver,
public nsSupportsWeakReference
{
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIEXTERNALHELPERAPPSERVICE
NS_DECL_NSPIEXTERNALAPPLAUNCHER
NS_DECL_NSIEXTERNALPROTOCOLSERVICE
NS_DECL_NSIMIMESERVICE
NS_DECL_NSIOBSERVER
nsExternalHelperAppService();
virtual ~nsExternalHelperAppService();
/**
* Initializes internal state. Will be called automatically when
* this service is first instantiated.
*/
NS_HIDDEN_(nsresult) Init();
/**
* Given a mimetype and an extension, looks up a mime info from the OS.
* The mime type is given preference. This function follows the same rules
* as nsIMIMEService::GetFromTypeAndExtension.
* This is supposed to be overridden by the platform-specific
* nsOSHelperAppService!
* @param aFileExt The file extension; may be empty. UTF-8 encoded.
* @param [out] aFound
* Should be set to PR_TRUE if the os has a mapping, to
* PR_FALSE otherwise. Must not be null.
* @return A MIMEInfo. This function must return a MIMEInfo object if it
* can allocate one. The only justifiable reason for not
* returning one is an out-of-memory error.
* If null, the value of aFound is unspecified.
*/
virtual already_AddRefed<nsIMIMEInfo> GetMIMEInfoFromOS(const nsACString& aMIMEType,
const nsACString& aFileExt,
PRBool * aFound) = 0;
/**
* Given a string identifying an application, create an nsIFile representing
* it. This function should look in $PATH for the application.
* The base class implementation will first try to interpret platformAppPath
* as an absolute path, and if that fails it will look for a file next to the
* mozilla executable. Subclasses can override this method if they want a
* different behaviour.
* @param platformAppPath A platform specific path to an application that we
* got out of the rdf data source. This can be a mac
* file spec, a unix path or a windows path depending
* on the platform
* @param aFile [out] An nsIFile representation of that platform
* application path.
*/
virtual nsresult GetFileTokenForPath(const PRUnichar * platformAppPath,
nsIFile ** aFile);
virtual NS_HIDDEN_(nsresult) OSProtocolHandlerExists(const char *aScheme,
PRBool *aExists) = 0;
protected:
/**
* Searches the "extra" array of MIMEInfo objects for an object
* with a specific type. If found, it will modify the passed-in
* MIMEInfo. Otherwise, it will return an error and the MIMEInfo
* will be untouched.
* @param aContentType The type to search for.
* @param aMIMEInfo [inout] The mime info, if found
*/
NS_HIDDEN_(nsresult) FillMIMEInfoForMimeTypeFromExtras(
const nsACString& aContentType, nsIMIMEInfo * aMIMEInfo);
/**
* Searches the "extra" array of MIMEInfo objects for an object
* with a specific extension.
*
* Does not change the MIME Type of the MIME Info.
*
* @see FillMIMEInfoForMimeTypeFromExtras
*/
NS_HIDDEN_(nsresult) FillMIMEInfoForExtensionFromExtras(
const nsACString& aExtension, nsIMIMEInfo * aMIMEInfo);
/**
* Searches the "extra" array for a MIME type, and gets its extension.
* @param aExtension The extension to search for
* @param aMIMEType [out] The found MIME type.
* @return PR_TRUE if the extension was found, PR_FALSE otherwise.
*/
NS_HIDDEN_(PRBool) GetTypeFromExtras(const nsACString& aExtension,
nsACString& aMIMEType);
/**
* Fixes the file permissions to be correct. Base class has a no-op
* implementation, subclasses can use this to correctly inherit ACLs from the
* parent directory, to make the permissions obey the umask, etc.
*/
virtual void FixFilePermissions(nsILocalFile* aFile);
#ifdef PR_LOGGING
/**
* NSPR Logging Module. Usage: set NSPR_LOG_MODULES=HelperAppService:level,
* where level should be 2 for errors, 3 for debug messages from the cross-
* platform nsExternalHelperAppService, and 4 for os-specific debug messages.
*/
static PRLogModuleInfo* mLog;
#endif
// friend, so that it can access the nspr log module and FixFilePermissions
friend class nsExternalAppHandler;
friend class nsExternalLoadRequest;
/**
* Functions related to the tempory file cleanup service provided by
* nsExternalHelperAppService
*/
NS_HIDDEN_(nsresult) ExpungeTemporaryFiles();
/**
* Array for the files that should be deleted
*/
nsCOMArray<nsILocalFile> mTemporaryFilesList;
};
/**
* We need to read the data out of the incoming stream into a buffer which we
* can then use to write the data into the output stream representing the
* temp file.
*/
#define DATA_BUFFER_SIZE (4096*2)
/**
* An external app handler is just a small little class that presents itself as
* a nsIStreamListener. It saves the incoming data into a temp file. The handler
* is bound to an application when it is created. When it receives an
* OnStopRequest it launches the application using the temp file it has
* stored the data into. We create a handler every time we have to process
* data using a helper app.
*/
class nsExternalAppHandler : public nsIStreamListener,
public nsIHelperAppLauncher,
public nsITimerCallback
{
public:
NS_DECL_ISUPPORTS
NS_DECL_NSISTREAMLISTENER
NS_DECL_NSIREQUESTOBSERVER
NS_DECL_NSIHELPERAPPLAUNCHER
NS_DECL_NSICANCELABLE
NS_DECL_NSITIMERCALLBACK
/**
* @param aMIMEInfo MIMEInfo object, representing the type of the
* content that should be handled
* @param aFileExtension The extension we need to append to our temp file,
* INCLUDING the ".". e.g. .mp3
* @param aWindowContext Window context, as passed to DoContent
* @param aFileName The filename to use
* @param aReason A constant from nsIHelperAppLauncherDialog indicating
* why the request is handled by a helper app.
*/
nsExternalAppHandler(nsIMIMEInfo * aMIMEInfo, const nsCSubstring& aFileExtension,
nsIInterfaceRequestor * aWindowContext,
const nsAString& aFilename,
PRUint32 aReason, PRBool aForceSave);
~nsExternalAppHandler();
protected:
nsCOMPtr<nsIFile> mTempFile;
nsCOMPtr<nsIURI> mSourceUrl;
nsString mTempFileExtension;
/**
* The MIME Info for this load. Will never be null.
*/
nsCOMPtr<nsIMIMEInfo> mMimeInfo;
nsCOMPtr<nsIOutputStream> mOutStream; /**< output stream to the temp file */
nsCOMPtr<nsIInterfaceRequestor> mWindowContext;
/**
* Used to close the window on a timer, to avoid any exceptions that are
* thrown if we try to close the window before it's fully loaded.
*/
nsCOMPtr<nsIDOMWindowInternal> mWindowToClose;
nsCOMPtr<nsITimer> mTimer;
/**
* The following field is set if we were processing an http channel that had
* a content disposition header which specified the SUGGESTED file name we
* should present to the user in the save to disk dialog.
*/
nsString mSuggestedFileName;
/**
* If set, this handler should forcibly save the file to disk regardless of
* MIME info settings or anything else, without ever popping up the
* unknown content type handling dialog.
*/
PRPackedBool mForceSave;
/**
* The canceled flag is set if the user canceled the launching of this
* application before we finished saving the data to a temp file.
*/
PRPackedBool mCanceled;
/**
* This is set based on whether the channel indicates that a new window
* was opened specifically for this download. If so, then we
* close it.
*/
PRPackedBool mShouldCloseWindow;
/**
* have we received information from the user about how they want to
* dispose of this content
*/
PRPackedBool mReceivedDispositionInfo;
PRPackedBool mStopRequestIssued;
PRPackedBool mProgressListenerInitialized;
PRPackedBool mIsFileChannel;
/**
* One of the REASON_ constants from nsIHelperAppLauncherDialog. Indicates the
* reason the dialog was shown (unknown content type, server requested it,
* etc).
*/
PRUint32 mReason;
/**
* Track the executable-ness of the temporary file.
*/
PRBool mTempFileIsExecutable;
PRTime mTimeDownloadStarted;
nsInt64 mContentLength;
nsInt64 mProgress; /**< Number of bytes received (for sending progress notifications). */
/**
* When we are told to save the temp file to disk (in a more permament
* location) before we are done writing the content to a temp file, then
* we need to remember the final destination until we are ready to use it.
*/
nsCOMPtr<nsIFile> mFinalFileDestination;
char mDataBuffer[DATA_BUFFER_SIZE];
/**
* Creates the temporary file for the download and an output stream for it.
* Upon successful return, both mTempFile and mOutStream will be valid.
*/
nsresult SetUpTempFile(nsIChannel * aChannel);
/**
* When we download a helper app, we are going to retarget all load
* notifications into our own docloader and load group instead of
* using the window which initiated the load....RetargetLoadNotifications
* contains that information...
*/
void RetargetLoadNotifications(nsIRequest *request);
/**
* If the user tells us how they want to dispose of the content and
* we still haven't finished downloading while they were deciding,
* then create a progress listener of some kind so they know
* what's going on...
*/
nsresult CreateProgressListener();
nsresult PromptForSaveToFile(nsILocalFile ** aNewFile,
const nsAFlatString &aDefaultFile,
const nsAFlatString &aDefaultFileExt);
/**
* After we're done prompting the user for any information, if the original
* channel had a refresh url associated with it (which might point to a
* "thank you for downloading" kind of page, then process that....It is safe
* to invoke this method multiple times. We'll clear mOriginalChannel after
* it's called and this ensures we won't call it again....
*/
void ProcessAnyRefreshTags();
/**
* An internal method used to actually move the temp file to the final
* destination once we done receiving data AND have showed the progress dialog
*/
nsresult MoveFile(nsIFile * aNewFileLocation);
/**
* An internal method used to actually launch a helper app given the temp file
* once we are done receiving data AND have showed the progress dialog.
* Uses the application specified in the mime info.
*/
nsresult OpenWithApplication();
/**
* Helper routine which peaks at the mime action specified by mMimeInfo
* and calls either MoveFile or OpenWithApplication
*/
nsresult ExecuteDesiredAction();
/**
* Helper routine that searches a pref string for a given mime type
*/
PRBool GetNeverAskFlagFromPref(const char * prefName, const char * aContentType);
/**
* Initialize an nsITransfer object for use as a progress object
*/
nsresult InitializeDownload(nsITransfer*);
/**
* Helper routine to ensure mSuggestedFileName is "correct";
* this ensures that mTempFileExtension only contains an extension when it
* is different from mSuggestedFileName's extension.
*/
void EnsureSuggestedFileName();
typedef enum { kReadError, kWriteError, kLaunchError } ErrorType;
/**
* Utility function to send proper error notification to web progress listener
*/
void SendStatusChange(ErrorType type, nsresult aStatus, nsIRequest *aRequest, const nsAFlatString &path);
/**
* Closes the window context if it does not have a refresh header
* and it never displayed content before the external helper app
* service was invoked.
*/
nsresult MaybeCloseWindow();
nsCOMPtr<nsIWebProgressListener2> mWebProgressListener;
nsCOMPtr<nsIChannel> mOriginalChannel; /**< in the case of a redirect, this will be the pre-redirect channel. */
nsCOMPtr<nsIHelperAppLauncherDialog> mDialog;
/**
* The request that's being loaded. Not used after OnStopRequest, so a weak
* reference suffices. Initialized in OnStartRequest.
*/
nsIRequest* mRequest;
};
extern NS_HIDDEN_(nsExternalHelperAppService*) gExtProtSvc;
#endif // nsExternalHelperAppService_h__