path: root/embed/mozilla/ContentHandler.cpp

/*
 *  Copyright (C) 2001 Philip Langdale
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2, or (at your option)
 *  any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

/*
 * The functioning of the download architecture, as described by Philip
 * on 28 May 2001 and updated on 28 June 2001:
 * 
 * When mozilla runs into a file it cannot render internally or that it
 * does not have a plugin for, it calls the
 * nsIExternalHelperAppService. This service will then either attempt to
 * save the file or run it with a helper app depending on what the
 * mozilla mime database returns.
 * 
 * nsIExternalHelperAppService then calls out to the nsIHelperAppDialog
 * interface which handles the UI for the service. This is the interface
 * which we have reimplemented. Therefore, with a major caveat, we have
 * put a GNOME/GTK frontend on an unmodified mozilla backend.
 * 
 * Now for the caveat. With respect to saving files to disk, the mozilla
 * backend works exactly the same as it does in
 * mozilla-the-browser. However, for dealing with helper apps, we do not
 * use the mozilla backend at all. This is because we want to use the
 * gnome-vfs database to retrieve helper-app info, rather than the
 * mozilla helper app database.
 * 
 * How it works:
 * 
 * a) The user clicks on a link or follows a redirect to a file of a type
 * that mozilla cannot handle. Mozilla passes the link to the
 * ExternalHelperAppService which in turn calls the Show() method of
 * nsIHelperAppDialog.
 * 
 * b) In our implementation of Show() we first compare the passed mime
 * type to epiphany's mime list. If the mime type is in the list, we then
 * lookup the Action associated with the mime type. Currently, the
 * possible mime-actions are:
 * 
 * Save to Disk
 * Run with Helper App
 * Ask User
 * 
 * The default action is Ask User, and if the mime-type is not in our
 * list, this is what will be assumed.
 * 
 * c) If Ask User is the chosen action, a dialog will be shown to the
 * user allowing the user to choose from the other two possible actions
 * as well as a checkbox to let the user set the default action to the
 * chosen action for the future.
 * 
 * d-1) The "Save to Disk" action. We first check epiphany preferences to
 * see if the user wants to use the built-in mozilla downloader, gtm or
 * a command-line executed downloader.
 *
 * d-2a) The built-in downloader.  This action is handled by the mozilla
 * backend. Our nsIHelperAppDialog does the same thing that the
 * mozilla-the-browser one does, which is to call the SaveToDisk() method
 * of nsIExternalHelperAppService. This in turn calls the
 * PromptForSaveToFile() method of nsIHelperAppDialog putting the ball
 * back in our court.
 * 
 * d-2b) Now, if epiphany is configured to always ask for a download
 * directory, it will pop up a file selector so that the user can select
 * the directory and filename to save the file to.  Otherwise, it will
 * use epiphany's default download directory and proceed without
 * interaction.
 * 
 * d-2c) When PromptForSaveToFile() returns, nsIExternalHelperAppService
 * will then call the ShowProgressDialog() method of
 * nsIHelperAppDialog. This progress dialog, obviously, tracks the
 * progress of the download. It is worth noting that mozilla starts the
 * actual download as soon as the user clicks on the link or follows the
 * redirect. While the user is deciding what action to take, the file is
 * downloading. Often, for small files, the file is already downloaded
 * when the user decides what directory to put it in. The progress dialog
 * does not appear in these cases. Also, we currently have a small
 * problem where our progress dialog times the download from the point
 * the dialog appears, not from the time the download starts. This is due
 * to the timestamp that is passed to us is just plain weird, and I
 * haven't worked out how to turn it into a useable time. The fact that
 * the download starts early means that the file is actually downloaded
 * to a temp file and only at the end is it moved to it's final location.
 * 
 * d-3a) The two external downloader options.  These options are
 * handled completely by epiphany. The first thing that we do is call the
 * Cancel() method of nsIExternalHelperAppService to cancel the mozilla
 * download. We then pass the url to our own LaunchExternalDownloader()
 * method. This method will ask for a download directory as appropriate
 * as with the "Save to disk" action.
 * 
 * d-3b) Finally, depending on whether GTM or a command line handler was
 * selected in prefs, the external handler will be called with the url
 * passed and the directory selected.
 * 
 * e-1) The "Run with Helper App" action.  This action is currently only
 * working with a minimal implementation.  First, we explicitly call
 * ShowProgressDialog() so the user knows that the file is being
 * downloaded. We also need this so that we only run the helper after the
 * file is completely downloaded. The file will download to temp location
 * that it would be moved from if the action was "Save to Disk".  We have
 * to call ShowProgressDialog() ourselves because we are not using
 * mozilla's helper mechanism which would usually make the call for us.
 * 
 * e-2) If there is a default helper app in our mime database and alwaysAsk
 * is false, epiphany will run the default helper automatically. Otherwise it
 * will pop up a helper chooser dialog which lists the helpers that gnome-vfs
 * knows about as well as providing a GnomeFileEntry to allow the user to
 * select and arbitrary application. The default value of the GnomeFileEntry
 * is the helper stored in our database if one exits.
 * 
 * f) General notes.  We cannot use this infrastructure to override
 * native mozilla types. mozilla will attempt to render these types and
 * never call out to us. We are at the end of the chain as the handler of
 * last resort, so native and plugin types will never reach us. This also
 * means that a file with an incorrect mime-type ( eg: .tar.bz2 marked as
 * text/plain ) will be incorrectly rendered by mozilla. We cannot help
 * this.
 * 
 * Despite the apparent user-side similarity with explicit downloads by
 * a shift-click or context-menu item, there is actually none at all.
 * Explicit downloads are handled by the nsIStreamTransfer manager which
 * we use as is. Currently the progress dialog for the stream transfer
 * manager is un-overridable, so it appears in XUL. This will change in
 * due course.
 * 
 * Matt would like the modifiy the progress dialog so each file currently
 * being downloaded becomes a clist entry in a master dialog rather than
 * causing a separate progress dialog. a lot of progress dialogs gets
 * really messy.
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

extern "C" {
#include "libgnomevfs/gnome-vfs-mime-handlers.h"
}

#include "ephy-embed-shell.h"
#include "ephy-prefs.h"
#include "eel-gconf-extensions.h"
#include "ephy-glade.h"
#include "ephy-string.h"
#include "ephy-gui.h"
#include "ephy-embed-utils.h"
#include "ephy-file-helpers.h"
#include "ProgressListener.h"
#include "ContentHandler.h"

#include <gtk/gtkentry.h>
#include <gtk/gtktogglebutton.h>
#include <gtk/gtkprogress.h>
#include <gtk/gtkoptionmenu.h>
#include <libgnome/gnome-exec.h>
#include <libgnome/gnome-i18n.h>
#include <libgnome/gnome-config.h>
#include <libgnome/gnome-util.h>
#include <libgnomevfs/gnome-vfs-mime.h>

#include "FilePicker.h"
#include "MozillaPrivate.h"

#include "nsCRT.h"
#include "nsCOMPtr.h"
#include "nsISupportsArray.h"
#include "nsIServiceManager.h"
#include "nsWeakReference.h"

#include "nsString.h"
#include "nsIURI.h"
#include "nsIURL.h"
#include "nsIChannel.h"
#include "nsILocalFile.h"
#include "nsIPrefService.h"
#include "nsIDOMWindow.h"
#include "nsIDOMWindowInternal.h"

class GContentHandler;
class GDownloadProgressListener;
struct MimeAskActionDialog;
struct HelperAppChooserDialog;

extern "C"
void mime_ask_dialog_save_clicked_cb (GtkButton *button,
                      MimeAskActionDialog *dialog);
extern "C"
void mime_ask_dialog_open_clicked_cb (GtkButton *button,
                      MimeAskActionDialog *dialog);
extern "C"
gint mime_ask_dialog_cancel_clicked_cb (GtkButton *button,
                    MimeAskActionDialog *dialog);

/*
 * MimeAskActionDialog: the representation of dialogs used to ask
 * about actions on MIME types
 */
struct MimeAskActionDialog
{
    MimeAskActionDialog(GContentHandler *aContentHandler,
                GtkWidget *aParentWidget,
                const char *aMimeType);
    ~MimeAskActionDialog();

    GContentHandler *mContentHandler;
    GladeXML *mGXml;
    GtkWidget *mParent;
    GtkWidget *mAppMenu;
    
    GnomeVFSMimeApplication *mDefaultApp;
};

/* Implementation file */
NS_IMPL_ISUPPORTS1(GContentHandler, nsIHelperAppLauncherDialog)

GContentHandler::GContentHandler() : mUri(nsnull),
                     mMimeType(nsnull),
                     mDownloadCanceled(PR_FALSE)
{
    NS_INIT_ISUPPORTS();
    /* member initializers and constructor code */
}

GContentHandler::~GContentHandler()
{
    /* destructor code */
    g_free (mUri);
    g_free (mMimeType);
}

////////////////////////////////////////////////////////////////////////////////
// begin nsIHelperAppLauncher impl
////////////////////////////////////////////////////////////////////////////////

/* void show (in nsIHelperAppLauncher aLauncher, in nsISupports aContext); */
NS_IMETHODIMP GContentHandler::Show(nsIHelperAppLauncher *aLauncher,
                    nsISupports *aContext)
{
    nsresult rv;

    mLauncher = aLauncher;
    mContext = aContext;
    rv = Init ();
    
    MIMEAskAction ();

    return NS_OK;
}

/* nsILocalFile promptForSaveToFile (in nsISupports aWindowContext, in wstring aDefaultFile, in wstring aSuggestedFileExtension); */
NS_IMETHODIMP GContentHandler::
        PromptForSaveToFile(nsISupports *aWindowContext,
                    const PRUnichar *aDefaultFile,
                    const PRUnichar *aSuggestedFileExtension,
                    nsILocalFile **_retval)
{
    nsresult rv;

    mContext = aWindowContext;

    nsCOMPtr<nsIDOMWindowInternal> windowInternal = 
                    do_QueryInterface (aWindowContext);
    
    nsCOMPtr<nsILocalFile> saveDir;
    char *dirName;
    
    dirName = eel_gconf_get_string (CONF_STATE_DOWNLOADING_DIR);
    if (dirName == NULL)
    {
        dirName = g_strdup (g_get_home_dir());
    }

    saveDir = do_CreateInstance (NS_LOCAL_FILE_CONTRACTID);
    saveDir->InitWithPath (NS_ConvertUTF8toUCS2(dirName));
    g_free (dirName);

    nsCOMPtr <nsILocalFile> saveFile (do_CreateInstance(NS_LOCAL_FILE_CONTRACTID));

    PRInt16 okToSave = nsIFilePicker::returnCancel;

    nsCOMPtr<nsIFilePicker> filePicker =
                do_CreateInstance (G_FILEPICKER_CONTRACTID);

    const nsAString &title = NS_ConvertUTF8toUCS2(_("Select the destination filename"));

    filePicker->Init (windowInternal,
               PromiseFlatString(title).get(), 
               nsIFilePicker::modeSave);
    filePicker->SetDefaultString (aDefaultFile);
    filePicker->SetDisplayDirectory (saveDir);

    filePicker->Show (&okToSave);

    if (okToSave == nsIFilePicker::returnOK)
    {
        filePicker->GetFile (getter_AddRefs(saveFile));

        nsString uFileName;
        saveFile->GetPath(uFileName);
        const nsCString &aFileName = NS_ConvertUCS2toUTF8(uFileName);

        char *dir = g_path_get_dirname (aFileName.get());

        eel_gconf_set_string (CONF_STATE_DOWNLOADING_DIR, dir);
        g_free (dir);

        nsCOMPtr<nsIFile> directory;
        rv = saveFile->GetParent (getter_AddRefs(directory));

        NS_IF_ADDREF (*_retval = saveFile);
        return NS_OK;
    }
    else
    {
        return NS_ERROR_FAILURE;
    }
}

#if MOZILLA_SNAPSHOT < 9
/* void showProgressDialog (in nsIHelperAppLauncher aLauncher, in nsISupports aContext); */
NS_METHOD GContentHandler::ShowProgressDialog(nsIHelperAppLauncher *aLauncher,
                          nsISupports *aContext)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}
#endif

////////////////////////////////////////////////////////////////////////////////
// begin local public methods impl
////////////////////////////////////////////////////////////////////////////////

NS_METHOD GContentHandler::FindHelperApp (void)
{
    if (mUrlHelper)
    {
        return LaunchHelperApp ();
    }
    else
    {
        if (NS_SUCCEEDED(SynchroniseMIMEInfo()))
        {
            return mLauncher->LaunchWithApplication(nsnull, PR_FALSE);
        }
        else
        {
                return NS_ERROR_FAILURE;
        }
    }
}

NS_METHOD GContentHandler::LaunchHelperApp (void)
{
    if (mMimeType)
    {
        nsresult rv;
        nsCOMPtr<nsIExternalHelperAppService> helperService =
            do_GetService (NS_EXTERNALHELPERAPPSERVICE_CONTRACTID);

        nsCOMPtr<nsPIExternalAppLauncher> appLauncher =
            do_QueryInterface (helperService, &rv);
        if (NS_SUCCEEDED(rv))
        {
            appLauncher->DeleteTemporaryFileOnExit(mTempFile);
        }

        nsString uFileName;
        mTempFile->GetPath(uFileName);
        const nsCString &aFileName = NS_ConvertUCS2toUTF8(uFileName);

        const nsCString &document = (mUrlHelper) ? mUrl : aFileName;

        char *param = g_strdup (document.get());
        ephy_file_launch_application (mHelperApp->command,
                          param,
                          mHelperApp->requires_terminal);

        if(mUrlHelper) mLauncher->Cancel();

        g_free (param);
    }
    else
    {
        mLauncher->Cancel ();
    }

    return NS_OK;
}

NS_METHOD GContentHandler::ShowHelperProgressDialog (void)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

NS_METHOD GContentHandler::GetLauncher (nsIHelperAppLauncher * *_retval)
{
    NS_IF_ADDREF (*_retval = mLauncher);
    return NS_OK;
}

NS_METHOD GContentHandler::GetContext (nsISupports * *_retval)
{
    NS_IF_ADDREF (*_retval = mContext);
    return NS_OK;
}

static gboolean 
application_support_scheme (GnomeVFSMimeApplication *app, const nsCString &aScheme)
{
    GList *l;

    g_return_val_if_fail (app != NULL, FALSE);
    g_return_val_if_fail (!aScheme.IsEmpty(), FALSE);
    
    if (app->expects_uris != GNOME_VFS_MIME_APPLICATION_ARGUMENT_TYPE_URIS)
        return FALSE;
    
    for (l = app->supported_uri_schemes; l != NULL; l = l->next)
    {
        char *uri_scheme = (char *)l->data;
        g_return_val_if_fail (uri_scheme != NULL, FALSE);
        if (aScheme.Equals(uri_scheme)) return TRUE;
    }

    return FALSE;
}

NS_METHOD GContentHandler::SetHelperApp(GnomeVFSMimeApplication *aHelperApp,
                    PRBool alwaysUse)
{
    mHelperApp = aHelperApp;
    mUrlHelper = application_support_scheme (aHelperApp, mScheme);

    return NS_OK;
}

NS_METHOD GContentHandler::SynchroniseMIMEInfo (void)
{
    nsresult rv;
    nsCOMPtr<nsIMIMEInfo> mimeInfo;
    rv = mLauncher->GetMIMEInfo(getter_AddRefs(mimeInfo));
    if(NS_FAILED(rv)) return NS_ERROR_FAILURE;

    nsCOMPtr<nsILocalFile> helperFile;
    rv = NS_NewNativeLocalFile(nsDependentCString(mHelperApp->command),
                   PR_TRUE,
                   getter_AddRefs(helperFile));
    if(NS_FAILED(rv)) return NS_ERROR_FAILURE;

    rv = mimeInfo->SetPreferredApplicationHandler(helperFile);
    if(NS_FAILED(rv)) return NS_ERROR_FAILURE;  

    nsMIMEInfoHandleAction mimeInfoAction;
    mimeInfoAction = nsIMIMEInfo::useHelperApp;

    if(mHelperApp->requires_terminal) //Information passing kludge!
    {
        rv = mimeInfo->SetApplicationDescription
                (NS_LITERAL_STRING("runInTerminal").get());
        if(NS_FAILED(rv)) return NS_ERROR_FAILURE;
    }

    rv = mimeInfo->SetPreferredAction(mimeInfoAction);
    if(NS_FAILED(rv)) return NS_ERROR_FAILURE;

    return NS_OK;
}

////////////////////////////////////////////////////////////////////////////////
// begin local private methods impl
////////////////////////////////////////////////////////////////////////////////
NS_METHOD GContentHandler::Init (void)
{
    nsresult rv;

    nsCOMPtr<nsIMIMEInfo> MIMEInfo;
    rv = mLauncher->GetMIMEInfo (getter_AddRefs(MIMEInfo));
    rv = MIMEInfo->GetMIMEType (&mMimeType);
    
    rv = mLauncher->GetDownloadInfo(getter_AddRefs(mUri),
                    &mTimeDownloadStarted,
                    getter_AddRefs(mTempFile));
    rv = mUri->GetSpec (mUrl);
    rv = mUri->GetScheme (mScheme);
#if 0
    /* GetSource seems redundant and isn't in 0.9 This code is here while
       it remains unclear what GetSource is for. --phil */
    nsCOMPtr<nsIURI> uri;
    rv = mLauncher->GetSource(getter_AddRefs(uri));
    rv = uri->GetSpec (mUrl);
#endif  
    ProcessMimeInfo ();

    return NS_OK;
}

NS_METHOD GContentHandler::ProcessMimeInfo (void)
{
    if (mMimeType == NULL ||
        !nsCRT::strcmp(mMimeType, "application/octet-stream"))
    {
        nsresult rv;
        nsCOMPtr<nsIURL> url = do_QueryInterface(mUri, &rv);
        if (NS_SUCCEEDED(rv) && url)
        {
            nsCAutoString uriFileName;
            url->GetFileName(uriFileName);
            mMimeType = g_strdup
                    (gnome_vfs_mime_type_from_name
                        (uriFileName.get()));
        }
        else
            mMimeType = g_strdup ("application/octet-stream");
    }

    return NS_OK;
}

NS_METHOD GContentHandler::MIMEAskAction (void)
{
    nsCOMPtr<nsIDOMWindow> parent = do_QueryInterface (mContext);
    GtkWidget *parentWidget = MozillaFindGtkParent (parent);

    new MimeAskActionDialog(this, parentWidget, mMimeType);

    return NS_OK;
}

////////////////////////////////////////////////////////////////////////////////
// begin MIMEAskActionDialog methods.
////////////////////////////////////////////////////////////////////////////////

MimeAskActionDialog::MimeAskActionDialog(GContentHandler *aContentHandler,
                     GtkWidget *aParentWidget,
                     const char *aMimeType) :
                     mContentHandler(aContentHandler),
                     mParent(aParentWidget)
{
    GtkWidget *label;
    GtkWidget *dialogWidget;
    const char *description;
    char ltext[255]; //philipl: Fixed length buffer == potential security problem...

    mGXml = ephy_glade_widget_new ("epiphany.glade", "mime_ask_action_dialog", 
                      &dialogWidget, this);
    mAppMenu = glade_xml_get_widget (mGXml, "mime_ask_dialog_app_menu");

    mDefaultApp = gnome_vfs_mime_get_default_application(aMimeType);

    GtkWidget *aMimeIcon = glade_xml_get_widget (mGXml,
                             "mime_ask_action_icon");
    gtk_image_set_from_file(GTK_IMAGE(aMimeIcon),
                gnome_vfs_mime_get_icon(aMimeType));                             

    description = gnome_vfs_mime_get_description (aMimeType);
    if (!description) description = aMimeType;
    
    g_snprintf (ltext, 255, "<b>%s</b>", description);
    label = glade_xml_get_widget (mGXml, "mime_ask_action_description");
    gtk_label_set_markup (GTK_LABEL (label), ltext);

    gtk_window_set_transient_for (GTK_WINDOW (dialogWidget), 
                      GTK_WINDOW (aParentWidget));

    gtk_widget_show(dialogWidget);
}

MimeAskActionDialog::~MimeAskActionDialog()
{
#if 0
    if(mApps)
        gnome_vfs_mime_application_list_free(mApps);
#endif

    gtk_widget_destroy(glade_xml_get_widget(mGXml, "mime_ask_action_dialog"));
    g_object_unref(G_OBJECT(mGXml));
}

////////////////////////////////////////////////////////////////////////////////
// begin MIMEAskActionDialog callbacks.
////////////////////////////////////////////////////////////////////////////////

extern "C" void
mime_ask_dialog_save_clicked_cb (GtkButton *button, MimeAskActionDialog *dialog)
{
    gtk_widget_hide (glade_xml_get_widget (dialog->mGXml, 
                           "mime_ask_action_dialog"));

    nsresult rv;
    nsCOMPtr<nsIHelperAppLauncher> launcher;
    rv = dialog->mContentHandler->GetLauncher (getter_AddRefs(launcher));
    
    launcher->SaveToDisk (nsnull,PR_FALSE);
    
    delete dialog;
}

static void
mime_ask_dialog_download_cancel (MimeAskActionDialog *dialog)
{
    nsresult rv;
    nsCOMPtr<nsIHelperAppLauncher> launcher;
    rv = dialog->mContentHandler->GetLauncher (getter_AddRefs(launcher));

    launcher->Cancel ();

    delete dialog;
}

extern "C" void
mime_ask_dialog_open_clicked_cb (GtkButton *button, MimeAskActionDialog *dialog)
{
    nsresult rv;
    nsCOMPtr<nsIHelperAppLauncher> launcher;
    rv = dialog->mContentHandler->GetLauncher (getter_AddRefs(launcher));
    GnomeVFSMimeApplication *app = dialog->mDefaultApp;

    if (app)
    {
        dialog->mContentHandler->SetHelperApp (app, FALSE);
        dialog->mContentHandler->FindHelperApp ();
        delete dialog;
    }
    else
    {   
        mime_ask_dialog_download_cancel (dialog);
        ephy_embed_utils_nohandler_dialog_run (dialog->mParent);
    }
}

extern "C" gint
mime_ask_dialog_cancel_clicked_cb (GtkButton *button,
                   MimeAskActionDialog *dialog)
{
    mime_ask_dialog_download_cancel (dialog);
    return 0; /* FIXME: philipl, is this the right thing to return? */
}