summaryrefslogtreecommitdiff
path: root/application/palemoon/components/shell/nsGNOMEShellService.cpp
blob: 14510d1113065c3de8c58742e1dd20f2c398caa2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
/* -*- 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/. */

#include "mozilla/ArrayUtils.h"

#include "nsCOMPtr.h"
#include "nsGNOMEShellService.h"
#include "nsShellService.h"
#include "nsIServiceManager.h"
#include "nsIFile.h"
#include "nsIProperties.h"
#include "nsDirectoryServiceDefs.h"
#include "nsIPrefService.h"
#include "prenv.h"
#include "nsStringAPI.h"
#include "nsIGConfService.h"
#include "nsIGIOService.h"
#include "nsIGSettingsService.h"
#include "nsIStringBundle.h"
#include "nsIOutputStream.h"
#include "nsIProcess.h"
#include "nsNetUtil.h"
#include "nsIDOMHTMLImageElement.h"
#include "nsIImageLoadingContent.h"
#include "imgIRequest.h"
#include "imgIContainer.h"
#include "prprf.h"
#if defined(MOZ_WIDGET_GTK)
#include "nsIImageToPixbuf.h"
#endif
#include "nsXULAppAPI.h"

#include <glib.h>
#include <glib-object.h>
#include <gtk/gtk.h>
#include <gdk/gdk.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <limits.h>
#include <stdlib.h>

using namespace mozilla;

struct ProtocolAssociation
{
  const char *name;
  bool essential;
};

struct MimeTypeAssociation
{
  const char *mimeType;
  const char *extensions;
};

static const ProtocolAssociation appProtocols[] = {
  { "http",   true     },
  { "https",  true     },
  { "ftp",    false },
  { "chrome", false }
};

static const MimeTypeAssociation appTypes[] = {
  { "text/html",             "htm html shtml" },
  { "application/xhtml+xml", "xhtml xht"      }
};

// GConf registry key constants
#define DG_BACKGROUND "/desktop/gnome/background"

static const char kDesktopImageKey[] = DG_BACKGROUND "/picture_filename";
static const char kDesktopOptionsKey[] = DG_BACKGROUND "/picture_options";
static const char kDesktopDrawBGKey[] = DG_BACKGROUND "/draw_background";
static const char kDesktopColorKey[] = DG_BACKGROUND "/primary_color";

static const char kDesktopBGSchema[] = "org.gnome.desktop.background";
static const char kDesktopImageGSKey[] = "picture-uri";
static const char kDesktopOptionGSKey[] = "picture-options";
static const char kDesktopDrawBGGSKey[] = "draw-background";
static const char kDesktopColorGSKey[] = "primary-color";

nsresult
nsGNOMEShellService::Init()
{
  nsresult rv;

  // GConf, GSettings or GIO _must_ be available, or we do not allow
  // CreateInstance to succeed.

  nsCOMPtr<nsIGConfService> gconf = do_GetService(NS_GCONFSERVICE_CONTRACTID);
  nsCOMPtr<nsIGIOService> giovfs =
    do_GetService(NS_GIOSERVICE_CONTRACTID);
  nsCOMPtr<nsIGSettingsService> gsettings =
    do_GetService(NS_GSETTINGSSERVICE_CONTRACTID);

  if (!gconf && !giovfs && !gsettings)
    return NS_ERROR_NOT_AVAILABLE;

  // Check G_BROKEN_FILENAMES.  If it's set, then filenames in glib use
  // the locale encoding.  If it's not set, they use UTF-8.
  mUseLocaleFilenames = PR_GetEnv("G_BROKEN_FILENAMES") != nullptr;

  if (GetAppPathFromLauncher())
    return NS_OK;

  nsCOMPtr<nsIProperties> dirSvc
    (do_GetService("@mozilla.org/file/directory_service;1"));
  NS_ENSURE_TRUE(dirSvc, NS_ERROR_NOT_AVAILABLE);

  nsCOMPtr<nsIFile> appPath;
  rv = dirSvc->Get(XRE_EXECUTABLE_FILE, NS_GET_IID(nsIFile),
                   getter_AddRefs(appPath));
  NS_ENSURE_SUCCESS(rv, rv);

  return appPath->GetNativePath(mAppPath);
}

NS_IMPL_ISUPPORTS(nsGNOMEShellService, nsIShellService)

bool
nsGNOMEShellService::GetAppPathFromLauncher()
{
  gchar *tmp;

  const char *launcher = PR_GetEnv("MOZ_APP_LAUNCHER");
  if (!launcher)
    return false;

  if (g_path_is_absolute(launcher)) {
    mAppPath = launcher;
    tmp = g_path_get_basename(launcher);
    gchar *fullpath = g_find_program_in_path(tmp);
    if (fullpath && mAppPath.Equals(fullpath))
      mAppIsInPath = true;
    g_free(fullpath);
  } else {
    tmp = g_find_program_in_path(launcher);
    if (!tmp)
      return false;
    mAppPath = tmp;
    mAppIsInPath = true;
  }

  g_free(tmp);
  return true;
}

bool
nsGNOMEShellService::KeyMatchesAppName(const char *aKeyValue) const
{

  gchar *commandPath;
  if (mUseLocaleFilenames) {
    gchar *nativePath = g_filename_from_utf8(aKeyValue, -1, nullptr, nullptr, nullptr);
    if (!nativePath) {
      NS_ERROR("Error converting path to filesystem encoding");
      return false;
    }

    commandPath = g_find_program_in_path(nativePath);
    g_free(nativePath);
  } else {
    commandPath = g_find_program_in_path(aKeyValue);
  }

  if (!commandPath)
    return false;

  bool matches = mAppPath.Equals(commandPath);
  g_free(commandPath);
  return matches;
}

bool
nsGNOMEShellService::CheckHandlerMatchesAppName(const nsACString &handler) const
{
  gint argc;
  gchar **argv;
  nsAutoCString command(handler);

  // The string will be something of the form: [/path/to/]browser "%s"
  // We want to remove all of the parameters and get just the binary name.

  if (g_shell_parse_argv(command.get(), &argc, &argv, nullptr) && argc > 0) {
    command.Assign(argv[0]);
    g_strfreev(argv);
  }

  if (!KeyMatchesAppName(command.get()))
    return false; // the handler is set to another app

  return true;
}

NS_IMETHODIMP
nsGNOMEShellService::IsDefaultBrowser(bool aStartupCheck,
                                      bool aForAllTypes,
                                      bool* aIsDefaultBrowser)
{
  *aIsDefaultBrowser = false;
  if (aStartupCheck)
    mCheckedThisSession = true;

  nsCOMPtr<nsIGConfService> gconf = do_GetService(NS_GCONFSERVICE_CONTRACTID);
  nsCOMPtr<nsIGIOService> giovfs = do_GetService(NS_GIOSERVICE_CONTRACTID);

  bool enabled;
  nsAutoCString handler;
  nsCOMPtr<nsIGIOMimeApp> gioApp;

  for (unsigned int i = 0; i < ArrayLength(appProtocols); ++i) {
    if (!appProtocols[i].essential)
      continue;

    if (gconf) {
      handler.Truncate();
      gconf->GetAppForProtocol(nsDependentCString(appProtocols[i].name),
                               &enabled, handler);

      if (!CheckHandlerMatchesAppName(handler) || !enabled)
        return NS_OK; // the handler is disabled or set to another app
    }

    if (giovfs) {
      handler.Truncate();
      giovfs->GetAppForURIScheme(nsDependentCString(appProtocols[i].name),
                                 getter_AddRefs(gioApp));
      if (!gioApp)
        return NS_OK;

      gioApp->GetCommand(handler);

      if (!CheckHandlerMatchesAppName(handler))
        return NS_OK; // the handler is set to another app
    }
  }

  *aIsDefaultBrowser = true;

  return NS_OK;
}

NS_IMETHODIMP
nsGNOMEShellService::SetDefaultBrowser(bool aClaimAllTypes,
                                       bool aForAllUsers)
{
#ifdef DEBUG
  if (aForAllUsers)
    NS_WARNING("Setting the default browser for all users is not yet supported");
#endif

  nsCOMPtr<nsIGConfService> gconf = do_GetService(NS_GCONFSERVICE_CONTRACTID);
  nsCOMPtr<nsIGIOService> giovfs = do_GetService(NS_GIOSERVICE_CONTRACTID);
  if (gconf) {
    nsAutoCString appKeyValue;
    if (mAppIsInPath) {
      // mAppPath is in the users path, so use only the basename as the launcher
      gchar *tmp = g_path_get_basename(mAppPath.get());
      appKeyValue = tmp;
      g_free(tmp);
    } else {
      appKeyValue = mAppPath;
    }

    appKeyValue.AppendLiteral(" %s");

    for (unsigned int i = 0; i < ArrayLength(appProtocols); ++i) {
      if (appProtocols[i].essential || aClaimAllTypes) {
        gconf->SetAppForProtocol(nsDependentCString(appProtocols[i].name),
                                 appKeyValue);
      }
    }
  }

  if (giovfs) {
    nsresult rv;
    nsCOMPtr<nsIStringBundleService> bundleService =
      do_GetService(NS_STRINGBUNDLE_CONTRACTID, &rv);
    NS_ENSURE_SUCCESS(rv, rv);

    nsCOMPtr<nsIStringBundle> brandBundle;
    rv = bundleService->CreateBundle(BRAND_PROPERTIES, getter_AddRefs(brandBundle));
    NS_ENSURE_SUCCESS(rv, rv);

    nsString brandShortName;
    brandBundle->GetStringFromName(MOZ_UTF16("brandShortName"),
                                   getter_Copies(brandShortName));

    // use brandShortName as the application id.
    NS_ConvertUTF16toUTF8 id(brandShortName);
    nsCOMPtr<nsIGIOMimeApp> appInfo;
    rv = giovfs->CreateAppFromCommand(mAppPath,
                                      id,
                                      getter_AddRefs(appInfo));
    NS_ENSURE_SUCCESS(rv, rv);

    // set handler for the protocols
    for (unsigned int i = 0; i < ArrayLength(appProtocols); ++i) {
      if (appProtocols[i].essential || aClaimAllTypes) {
        appInfo->SetAsDefaultForURIScheme(nsDependentCString(appProtocols[i].name));
      }
    }

    // set handler for .html and xhtml files and MIME types:
    if (aClaimAllTypes) {
      // Add mime types for html, xhtml extension and set app to just created appinfo.
      for (unsigned int i = 0; i < ArrayLength(appTypes); ++i) {
        appInfo->SetAsDefaultForMimeType(nsDependentCString(appTypes[i].mimeType));
        appInfo->SetAsDefaultForFileExtensions(nsDependentCString(appTypes[i].extensions));
      }
    }
  }

  return NS_OK;
}

NS_IMETHODIMP
nsGNOMEShellService::GetShouldCheckDefaultBrowser(bool* aResult)
{
  // If we've already checked, the browser has been started and this is a 
  // new window open, and we don't want to check again.
  if (mCheckedThisSession) {
    *aResult = false;
    return NS_OK;
  }

  nsCOMPtr<nsIPrefBranch> prefs;
  nsCOMPtr<nsIPrefService> pserve(do_GetService(NS_PREFSERVICE_CONTRACTID));
  if (pserve)
    pserve->GetBranch("", getter_AddRefs(prefs));

  if (prefs)
    prefs->GetBoolPref(PREF_CHECKDEFAULTBROWSER, aResult);

  return NS_OK;
}

NS_IMETHODIMP
nsGNOMEShellService::SetShouldCheckDefaultBrowser(bool aShouldCheck)
{
  nsCOMPtr<nsIPrefBranch> prefs;
  nsCOMPtr<nsIPrefService> pserve(do_GetService(NS_PREFSERVICE_CONTRACTID));
  if (pserve)
    pserve->GetBranch("", getter_AddRefs(prefs));

  if (prefs)
    prefs->SetBoolPref(PREF_CHECKDEFAULTBROWSER, aShouldCheck);

  return NS_OK;
}

NS_IMETHODIMP
nsGNOMEShellService::GetCanSetDesktopBackground(bool* aResult)
{
  // setting desktop background is currently only supported
  // for Gnome or desktops using the same GSettings and GConf keys
  const char* gnomeSession = getenv("GNOME_DESKTOP_SESSION_ID");
  if (gnomeSession) {
    *aResult = true;
  } else {
    *aResult = false;
  }

  return NS_OK;
}

static nsresult
WriteImage(const nsCString& aPath, imgIContainer* aImage)
{
#if !defined(MOZ_WIDGET_GTK)
  return NS_ERROR_NOT_AVAILABLE;
#else
  nsCOMPtr<nsIImageToPixbuf> imgToPixbuf =
    do_GetService("@mozilla.org/widget/image-to-gdk-pixbuf;1");
  if (!imgToPixbuf)
      return NS_ERROR_NOT_AVAILABLE;

  GdkPixbuf* pixbuf = imgToPixbuf->ConvertImageToPixbuf(aImage);
  if (!pixbuf)
      return NS_ERROR_NOT_AVAILABLE;

  gboolean res = gdk_pixbuf_save(pixbuf, aPath.get(), "png", nullptr, nullptr);

  g_object_unref(pixbuf);
  return res ? NS_OK : NS_ERROR_FAILURE;
#endif
}
                 
NS_IMETHODIMP
nsGNOMEShellService::SetDesktopBackground(nsIDOMElement* aElement, 
                                          int32_t aPosition)
{
  nsresult rv;
  nsCOMPtr<nsIImageLoadingContent> imageContent = do_QueryInterface(aElement, &rv);
  if (!imageContent) return rv;

  // get the image container
  nsCOMPtr<imgIRequest> request;
  rv = imageContent->GetRequest(nsIImageLoadingContent::CURRENT_REQUEST,
                                getter_AddRefs(request));
  if (!request) return rv;
  nsCOMPtr<imgIContainer> container;
  rv = request->GetImage(getter_AddRefs(container));
  if (!container) return rv;

  // Set desktop wallpaper filling style
  nsAutoCString options;
  if (aPosition == BACKGROUND_TILE)
    options.Assign("wallpaper");
  else if (aPosition == BACKGROUND_STRETCH)
    options.Assign("stretched");
  else if (aPosition == BACKGROUND_FILL)
    options.Assign("zoom");
  else if (aPosition == BACKGROUND_FIT)
    options.Assign("scaled");
  else
    options.Assign("centered");

  // Write the background file to the home directory.
  nsAutoCString filePath(PR_GetEnv("HOME"));

  // get the product brand name from localized strings
  nsString brandName;
  nsCID bundleCID = NS_STRINGBUNDLESERVICE_CID;
  nsCOMPtr<nsIStringBundleService> bundleService(do_GetService(bundleCID));
  if (bundleService) {
    nsCOMPtr<nsIStringBundle> brandBundle;
    rv = bundleService->CreateBundle(BRAND_PROPERTIES,
                                     getter_AddRefs(brandBundle));
    if (NS_SUCCEEDED(rv) && brandBundle) {
      rv = brandBundle->GetStringFromName(MOZ_UTF16("brandShortName"),
                                          getter_Copies(brandName));
      NS_ENSURE_SUCCESS(rv, rv);
    }
  }

  // build the file name
  filePath.Append('/');
  filePath.Append(NS_ConvertUTF16toUTF8(brandName));
  filePath.Append("_wallpaper.png");

  // write the image to a file in the home dir
  rv = WriteImage(filePath, container);
  NS_ENSURE_SUCCESS(rv, rv);

  // Try GSettings first. If we don't have GSettings or the right schema, fall back
  // to using GConf instead. Note that if GSettings works ok, the changes get
  // mirrored to GConf by the gsettings->gconf bridge in gnome-settings-daemon
  nsCOMPtr<nsIGSettingsService> gsettings = 
    do_GetService(NS_GSETTINGSSERVICE_CONTRACTID);
  if (gsettings) {
    nsCOMPtr<nsIGSettingsCollection> background_settings;
    gsettings->GetCollectionForSchema(
      NS_LITERAL_CSTRING(kDesktopBGSchema), getter_AddRefs(background_settings));
    if (background_settings) {
      gchar *file_uri = g_filename_to_uri(filePath.get(), nullptr, nullptr);
      if (!file_uri)
         return NS_ERROR_FAILURE;

      background_settings->SetString(NS_LITERAL_CSTRING(kDesktopOptionGSKey),
                                     options);

      background_settings->SetString(NS_LITERAL_CSTRING(kDesktopImageGSKey),
                                     nsDependentCString(file_uri));
      g_free(file_uri);
      background_settings->SetBoolean(NS_LITERAL_CSTRING(kDesktopDrawBGGSKey),
                                      true);
      return rv;
    }
  }

  // if the file was written successfully, set it as the system wallpaper
  nsCOMPtr<nsIGConfService> gconf = do_GetService(NS_GCONFSERVICE_CONTRACTID);

  if (gconf) {
    gconf->SetString(NS_LITERAL_CSTRING(kDesktopOptionsKey), options);

    // Set the image to an empty string first to force a refresh
    // (since we could be writing a new image on top of an existing
    // Firefox_wallpaper.png and nautilus doesn't monitor the file for changes)
    gconf->SetString(NS_LITERAL_CSTRING(kDesktopImageKey),
                     EmptyCString());

    gconf->SetString(NS_LITERAL_CSTRING(kDesktopImageKey), filePath);
    gconf->SetBool(NS_LITERAL_CSTRING(kDesktopDrawBGKey), true);
  }

  return rv;
}

#define COLOR_16_TO_8_BIT(_c) ((_c) >> 8)
#define COLOR_8_TO_16_BIT(_c) ((_c) << 8 | (_c))

NS_IMETHODIMP
nsGNOMEShellService::GetDesktopBackgroundColor(uint32_t *aColor)
{
  nsCOMPtr<nsIGSettingsService> gsettings = 
    do_GetService(NS_GSETTINGSSERVICE_CONTRACTID);
  nsCOMPtr<nsIGSettingsCollection> background_settings;
  nsAutoCString background;

  if (gsettings) {
    gsettings->GetCollectionForSchema(
      NS_LITERAL_CSTRING(kDesktopBGSchema), getter_AddRefs(background_settings));
    if (background_settings) {
      background_settings->GetString(NS_LITERAL_CSTRING(kDesktopColorGSKey),
                                     background);
    }
  }

  if (!background_settings) {
    nsCOMPtr<nsIGConfService> gconf = do_GetService(NS_GCONFSERVICE_CONTRACTID);
    if (gconf)
      gconf->GetString(NS_LITERAL_CSTRING(kDesktopColorKey), background);
  }

  if (background.IsEmpty()) {
    *aColor = 0;
    return NS_OK;
  }

  GdkColor color;
  gboolean success = gdk_color_parse(background.get(), &color);

  NS_ENSURE_TRUE(success, NS_ERROR_FAILURE);

  *aColor = COLOR_16_TO_8_BIT(color.red) << 16 |
            COLOR_16_TO_8_BIT(color.green) << 8 |
            COLOR_16_TO_8_BIT(color.blue);
  return NS_OK;
}

static void
ColorToCString(uint32_t aColor, nsCString& aResult)
{
  // The #rrrrggggbbbb format is used to match gdk_color_to_string()
  char *buf = aResult.BeginWriting(13);
  if (!buf)
    return;

  uint16_t red = COLOR_8_TO_16_BIT((aColor >> 16) & 0xff);
  uint16_t green = COLOR_8_TO_16_BIT((aColor >> 8) & 0xff);
  uint16_t blue = COLOR_8_TO_16_BIT(aColor & 0xff);

  PR_snprintf(buf, 14, "#%04x%04x%04x", red, green, blue);
}

NS_IMETHODIMP
nsGNOMEShellService::SetDesktopBackgroundColor(uint32_t aColor)
{
  NS_ASSERTION(aColor <= 0xffffff, "aColor has extra bits");
  nsAutoCString colorString;
  ColorToCString(aColor, colorString);

  nsCOMPtr<nsIGSettingsService> gsettings =
    do_GetService(NS_GSETTINGSSERVICE_CONTRACTID);
  if (gsettings) {
    nsCOMPtr<nsIGSettingsCollection> background_settings;
    gsettings->GetCollectionForSchema(
      NS_LITERAL_CSTRING(kDesktopBGSchema), getter_AddRefs(background_settings));
    if (background_settings) {
      background_settings->SetString(NS_LITERAL_CSTRING(kDesktopColorGSKey),
                                     colorString);
      return NS_OK;
    }
  }

  nsCOMPtr<nsIGConfService> gconf = do_GetService(NS_GCONFSERVICE_CONTRACTID);

  if (gconf) {
    gconf->SetString(NS_LITERAL_CSTRING(kDesktopColorKey), colorString);
  }

  return NS_OK;
}

NS_IMETHODIMP
nsGNOMEShellService::OpenApplication(int32_t aApplication)
{
  nsAutoCString scheme;
  if (aApplication == APPLICATION_MAIL)
    scheme.Assign("mailto");
  else if (aApplication == APPLICATION_NEWS)
    scheme.Assign("news");
  else
    return NS_ERROR_NOT_AVAILABLE;

  nsCOMPtr<nsIGIOService> giovfs = do_GetService(NS_GIOSERVICE_CONTRACTID);
  if (giovfs) {
    nsCOMPtr<nsIGIOMimeApp> gioApp;
    giovfs->GetAppForURIScheme(scheme, getter_AddRefs(gioApp));
    if (gioApp)
      return gioApp->Launch(EmptyCString());
  }

  nsCOMPtr<nsIGConfService> gconf = do_GetService(NS_GCONFSERVICE_CONTRACTID);
  if (!gconf)
    return NS_ERROR_FAILURE;

  bool enabled;
  nsAutoCString appCommand;
  gconf->GetAppForProtocol(scheme, &enabled, appCommand);

  if (!enabled)
    return NS_ERROR_FAILURE;

  // XXX we don't currently handle launching a terminal window.
  // If the handler requires a terminal, bail.
  bool requiresTerminal;
  gconf->HandlerRequiresTerminal(scheme, &requiresTerminal);
  if (requiresTerminal)
    return NS_ERROR_FAILURE;

  // Perform shell argument expansion
  int argc;
  char **argv;
  if (!g_shell_parse_argv(appCommand.get(), &argc, &argv, nullptr))
    return NS_ERROR_FAILURE;

  char **newArgv = new char*[argc + 1];
  int newArgc = 0;

  // Run through the list of arguments.  Copy all of them to the new
  // argv except for %s, which we skip.
  for (int i = 0; i < argc; ++i) {
    if (strcmp(argv[i], "%s") != 0)
      newArgv[newArgc++] = argv[i];
  }

  newArgv[newArgc] = nullptr;

  gboolean err = g_spawn_async(nullptr, newArgv, nullptr, G_SPAWN_SEARCH_PATH,
                               nullptr, nullptr, nullptr, nullptr);

  g_strfreev(argv);
  delete[] newArgv;

  return err ? NS_OK : NS_ERROR_FAILURE;
}

NS_IMETHODIMP
nsGNOMEShellService::OpenApplicationWithURI(nsIFile* aApplication, const nsACString& aURI)
{
  nsresult rv;
  nsCOMPtr<nsIProcess> process = 
    do_CreateInstance("@mozilla.org/process/util;1", &rv);
  if (NS_FAILED(rv))
    return rv;
  
  rv = process->Init(aApplication);
  if (NS_FAILED(rv))
    return rv;

  const nsCString spec(aURI);
  const char* specStr = spec.get();
  return process->Run(false, &specStr, 1);
}

NS_IMETHODIMP
nsGNOMEShellService::GetDefaultFeedReader(nsIFile** _retval)
{
  return NS_ERROR_NOT_IMPLEMENTED;
}