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gecko/uriloader/exthandler/nsExternalHelperAppService.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* 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/. */
#ifndef nsExternalHelperAppService_h__
#define nsExternalHelperAppService_h__
#ifdef MOZ_LOGGING
#define FORCE_PR_LOG
#endif
#include "prlog.h"
#include "prtime.h"
#include "nsIExternalHelperAppService.h"
#include "nsIExternalProtocolService.h"
#include "nsIWebProgressListener2.h"
#include "nsIHelperAppLauncherDialog.h"
#include "nsIMIMEInfo.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 "nsIChannel.h"
#include "nsITimer.h"
#include "nsIBackgroundFileSaver.h"
#include "nsIHandlerService.h"
#include "nsCOMPtr.h"
#include "nsIObserver.h"
#include "nsCOMArray.h"
#include "nsWeakReference.h"
#include "nsIPrompt.h"
#include "nsAutoPtr.h"
#include "mozilla/Attributes.h"
class nsExternalAppHandler;
class nsIMIMEInfo;
class nsITransfer;
class nsIDOMWindow;
/**
* 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();
/**
* Initializes internal state. Will be called automatically when
* this service is first instantiated.
*/
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 true if the os has a mapping, to
* 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,
bool * 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 char16_t * platformAppPath,
nsIFile ** aFile);
virtual nsresult OSProtocolHandlerExists(const char *aScheme,
bool *aExists) = 0;
protected:
virtual ~nsExternalHelperAppService();
/**
* 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
*/
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
*/
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 true if the extension was found, false otherwise.
*/
bool GetTypeFromExtras(const nsACString& aExtension,
nsACString& aMIMEType);
#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.
friend class nsExternalAppHandler;
/**
* Helper function for ExpungeTemporaryFiles and ExpungeTemporaryPrivateFiles
*/
static void ExpungeTemporaryFilesHelper(nsCOMArray<nsIFile> &fileList);
/**
* Helper function for DeleteTemporaryFileOnExit and DeleteTemporaryPrivateFileWhenPossible
*/
static nsresult DeleteTemporaryFileHelper(nsIFile* aTemporaryFile,
nsCOMArray<nsIFile> &aFileList);
/**
* Functions related to the tempory file cleanup service provided by
* nsExternalHelperAppService
*/
void ExpungeTemporaryFiles();
/**
* Functions related to the tempory file cleanup service provided by
* nsExternalHelperAppService (for the temporary files added during
* the private browsing mode)
*/
void ExpungeTemporaryPrivateFiles();
/**
* Array for the files that should be deleted
*/
nsCOMArray<nsIFile> mTemporaryFilesList;
/**
* Array for the files that should be deleted (for the temporary files
* added during the private browsing mode)
*/
nsCOMArray<nsIFile> mTemporaryPrivateFilesList;
};
/**
* 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 MOZ_FINAL : public nsIStreamListener,
public nsIHelperAppLauncher,
public nsITimerCallback,
public nsIBackgroundFileSaverObserver
{
public:
NS_DECL_THREADSAFE_ISUPPORTS
NS_DECL_NSISTREAMLISTENER
NS_DECL_NSIREQUESTOBSERVER
NS_DECL_NSIHELPERAPPLAUNCHER
NS_DECL_NSICANCELABLE
NS_DECL_NSITIMERCALLBACK
NS_DECL_NSIBACKGROUNDFILESAVEROBSERVER
/**
* @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 mExtProtSvc nsExternalHelperAppService on creation
* @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,
nsExternalHelperAppService * aExtProtSvc,
const nsAString& aFilename,
uint32_t aReason, bool aForceSave);
/**
* Clean up after the request was diverted to the parent process.
*/
void DidDivertRequest(nsIRequest *request);
protected:
~nsExternalAppHandler();
nsCOMPtr<nsIFile> mTempFile;
nsCOMPtr<nsIURI> mSourceUrl;
nsString mTempFileExtension;
nsString mTempLeafName;
/**
* The MIME Info for this load. Will never be null.
*/
nsCOMPtr<nsIMIMEInfo> mMimeInfo;
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<nsIDOMWindow> 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.
*/
bool 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.
*/
bool 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.
*/
bool mShouldCloseWindow;
/**
* True if a stop request has been issued.
*/
bool mStopRequestIssued;
bool mIsFileChannel;
/**
* One of the REASON_ constants from nsIHelperAppLauncherDialog. Indicates the
* reason the dialog was shown (unknown content type, server requested it,
* etc).
*/
uint32_t mReason;
/**
* Track the executable-ness of the temporary file.
*/
bool mTempFileIsExecutable;
PRTime mTimeDownloadStarted;
int64_t mContentLength;
int64_t 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;
uint32_t mBufferSize;
/**
* This object handles saving the data received from the network to a
* temporary location first, and then move the file to its final location,
* doing all the input/output on a background thread.
*/
nsCOMPtr<nsIBackgroundFileSaver> mSaver;
/**
* Stores the SHA-256 hash associated with the file that we downloaded.
*/
nsAutoCString mHash;
/**
* Stores the signature information of the downloaded file in an nsIArray of
* nsIX509CertList of nsIX509Cert. If the file is unsigned this will be
* empty.
*/
nsCOMPtr<nsIArray> mSignatureInfo;
/**
* Stores the redirect information associated with the channel.
*/
nsCOMPtr<nsIArray> mRedirects;
/**
* Creates the temporary file for the download and an output stream for it.
* Upon successful return, both mTempFile and mSaver 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);
/**
* Once the user tells us how they want to dispose of the content
* create an nsITransfer so they know what's going on. If this fails, the
* caller MUST call Cancel.
*/
nsresult CreateTransfer();
/**
* If we fail to create the necessary temporary file to initiate a transfer
* we will report the failure by creating a failed nsITransfer.
*/
nsresult CreateFailedTransfer(bool aIsPrivateBrowsing);
/*
* The following two functions are part of the split of SaveToDisk
* to make it async, and works as following:
*
* SaveToDisk -------> RequestSaveDestination
* .
* .
* v
* ContinueSave <------- SaveDestinationAvailable
*/
/**
* This is called by SaveToDisk to decide what's the final
* file destination chosen by the user or by auto-download settings.
*/
void RequestSaveDestination(const nsAFlatString &aDefaultFile,
const nsAFlatString &aDefaultFileExt);
/**
* When SaveToDisk is called, it possibly delegates to RequestSaveDestination
* to decide the file destination. ContinueSave must then be called when
* the final destination is finally known.
* @param aFile The file that was chosen as the final destination.
* Must not be null.
*/
nsresult ContinueSave(nsIFile* aFile);
/**
* 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();
/**
* Notify our nsITransfer object that we are done with the download. This is
* always called after the target file has been closed.
*
* @param aStatus
* NS_OK for success, or a failure code if the download failed.
* A partially downloaded file may still be available in this case.
*/
void NotifyTransfer(nsresult aStatus);
/**
* Helper routine that searches a pref string for a given mime type
*/
bool GetNeverAskFlagFromPref(const char * prefName, const char * aContentType);
/**
* 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();
/**
* Set in nsHelperDlgApp.js. This is always null after the user has chosen an
* action.
*/
nsCOMPtr<nsIWebProgressListener2> mDialogProgressListener;
/**
* Set once the user has chosen an action. This is null after the download
* has been canceled or completes.
*/
nsCOMPtr<nsITransfer> mTransfer;
nsCOMPtr<nsIChannel> mOriginalChannel; /**< in the case of a redirect, this will be the pre-redirect channel. */
nsCOMPtr<nsIHelperAppLauncherDialog> mDialog;
/**
* Keep request alive in case when helper non-modal dialog shown.
* Thus in OnStopRequest the mRequest will not be set to null (it will be set to null further).
*/
bool mKeepRequestAlive;
/**
* The request that's being loaded. Initialized in OnStartRequest.
* Nulled out in OnStopRequest or once we know what we're doing
* with the data, whichever happens later.
*/
nsCOMPtr<nsIRequest> mRequest;
nsRefPtr<nsExternalHelperAppService> mExtProtSvc;
};
#endif // nsExternalHelperAppService_h__
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