summaryrefslogtreecommitdiffstats
path: root/application/basilisk/base/content/utilityOverlay.js
blob: f3ebf3b7eb72b1d794e6fa70b1c785053c78cd28 (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
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
/* -*- indent-tabs-mode: nil; js-indent-level: 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/. */

// Services = object with smart getters for common XPCOM services
Components.utils.import("resource://gre/modules/AppConstants.jsm");
Components.utils.import("resource://gre/modules/Services.jsm");
Components.utils.import("resource://gre/modules/XPCOMUtils.jsm");
Components.utils.import("resource://gre/modules/PrivateBrowsingUtils.jsm");
Components.utils.import("resource:///modules/RecentWindow.jsm");

XPCOMUtils.defineLazyModuleGetter(this, "ShellService",
                                  "resource:///modules/ShellService.jsm");

XPCOMUtils.defineLazyServiceGetter(this, "aboutNewTabService",
                                   "@mozilla.org/browser/aboutnewtab-service;1",
                                   "nsIAboutNewTabService");

this.__defineGetter__("BROWSER_NEW_TAB_URL", () => {
  if (PrivateBrowsingUtils.isWindowPrivate(window) &&
      !PrivateBrowsingUtils.permanentPrivateBrowsing &&
      !aboutNewTabService.overridden) {
    return "about:privatebrowsing";
  }
  return aboutNewTabService.newTabURL;
});

var TAB_DROP_TYPE = "application/x-moz-tabbrowser-tab";

var gBidiUI = false;

/**
 * Determines whether the given url is considered a special URL for new tabs.
 */
function isBlankPageURL(aURL) {
  return aURL == "about:blank" || aURL == "about:newtab" || aURL == "about:logopage";
}

function getBrowserURL()
{
  return "chrome://browser/content/browser.xul";
}

function getTopWin(skipPopups) {
  // If this is called in a browser window, use that window regardless of
  // whether it's the frontmost window, since commands can be executed in
  // background windows (bug 626148).
  if (top.document.documentElement.getAttribute("windowtype") == "navigator:browser" &&
      (!skipPopups || top.toolbar.visible))
    return top;

  let isPrivate = PrivateBrowsingUtils.isWindowPrivate(window);
  return RecentWindow.getMostRecentBrowserWindow({private: isPrivate,
                                                  allowPopups: !skipPopups});
}

function openTopWin(url) {
  /* deprecated */
  openUILinkIn(url, "current");
}

/* openUILink handles clicks on UI elements that cause URLs to load.
 *
 * As the third argument, you may pass an object with the same properties as
 * accepted by openUILinkIn, plus "ignoreButton" and "ignoreAlt".
 */
function openUILink(url, event, aIgnoreButton, aIgnoreAlt, aAllowThirdPartyFixup,
                    aPostData, aReferrerURI) {
  let params;

  if (aIgnoreButton && typeof aIgnoreButton == "object") {
    params = aIgnoreButton;

    // don't forward "ignoreButton" and "ignoreAlt" to openUILinkIn
    aIgnoreButton = params.ignoreButton;
    aIgnoreAlt = params.ignoreAlt;
    delete params.ignoreButton;
    delete params.ignoreAlt;
  } else {
    params = {
      allowThirdPartyFixup: aAllowThirdPartyFixup,
      postData: aPostData,
      referrerURI: aReferrerURI,
      referrerPolicy: Components.interfaces.nsIHttpChannel.REFERRER_POLICY_DEFAULT,
      initiatingDoc: event ? event.target.ownerDocument : null,
    };
  }

  let where = whereToOpenLink(event, aIgnoreButton, aIgnoreAlt);
  openUILinkIn(url, where, params);
}


/* whereToOpenLink() looks at an event to decide where to open a link.
 *
 * The event may be a mouse event (click, double-click, middle-click) or keypress event (enter).
 *
 * On Windows, the modifiers are:
 * Ctrl        new tab, selected
 * Shift       new window
 * Ctrl+Shift  new tab, in background
 * Alt         save
 *
 * Middle-clicking is the same as Ctrl+clicking (it opens a new tab).
 *
 * Exceptions:
 * - Alt is ignored for menu items selected using the keyboard so you don't accidentally save stuff.
 *    (Currently, the Alt isn't sent here at all for menu items, but that will change in bug 126189.)
 * - Alt is hard to use in context menus, because pressing Alt closes the menu.
 * - Alt can't be used on the bookmarks toolbar because Alt is used for "treat this as something draggable".
 * - The button is ignored for the middle-click-paste-URL feature, since it's always a middle-click.
 */
function whereToOpenLink( e, ignoreButton, ignoreAlt )
{
  // This method must treat a null event like a left click without modifier keys (i.e.
  // e = { shiftKey:false, ctrlKey:false, metaKey:false, altKey:false, button:0 })
  // for compatibility purposes.
  if (!e)
    return "current";

  var shift = e.shiftKey;
  var ctrl =  e.ctrlKey;
  var meta =  e.metaKey;
  var alt  =  e.altKey && !ignoreAlt;

  // ignoreButton allows "middle-click paste" to use function without always opening in a new window.
  var middle = !ignoreButton && e.button == 1;
  var middleUsesTabs = Services.prefs.getBoolPref("browser.tabs.opentabfor.middleclick", true);

  // Don't do anything special with right-mouse clicks.  They're probably clicks on context menu items.

  var metaKey = AppConstants.platform == "macosx" ? meta : ctrl;
  if (metaKey || (middle && middleUsesTabs))
    return shift ? "tabshifted" : "tab";

  if (alt && Services.prefs.getBoolPref("browser.altClickSave", false))
    return "save";

  if (shift || (middle && !middleUsesTabs))
    return "window";

  return "current";
}

/* openUILinkIn opens a URL in a place specified by the parameter |where|.
 *
 * |where| can be:
 *  "current"     current tab            (if there aren't any browser windows, then in a new window instead)
 *  "tab"         new tab                (if there aren't any browser windows, then in a new window instead)
 *  "tabshifted"  same as "tab" but in background if default is to select new tabs, and vice versa
 *  "window"      new window
 *  "save"        save to disk (with no filename hint!)
 *
 * aAllowThirdPartyFixup controls whether third party services such as Google's
 * I Feel Lucky are allowed to interpret this URL. This parameter may be
 * undefined, which is treated as false.
 *
 * Instead of aAllowThirdPartyFixup, you may also pass an object with any of
 * these properties:
 *   allowThirdPartyFixup (boolean)
 *   postData             (nsIInputStream)
 *   referrerURI          (nsIURI)
 *   relatedToCurrent     (boolean)
 *   skipTabAnimation     (boolean)
 *   allowPinnedTabHostChange (boolean)
 *   allowPopups          (boolean)
 */
function openUILinkIn(url, where, aAllowThirdPartyFixup, aPostData, aReferrerURI) {
  var params;

  if (arguments.length == 3 && typeof arguments[2] == "object") {
    params = aAllowThirdPartyFixup;
  } else {
    params = {
      allowThirdPartyFixup: aAllowThirdPartyFixup,
      postData: aPostData,
      referrerURI: aReferrerURI,
      referrerPolicy: Components.interfaces.nsIHttpChannel.REFERRER_POLICY_DEFAULT,
    };
  }

  params.fromChrome = true;

  openLinkIn(url, where, params);
}

/* eslint-disable complexity */
function openLinkIn(url, where, params) {
  if (!where || !url)
    return;
  const Cc = Components.classes;
  const Ci = Components.interfaces;

  var aFromChrome           = params.fromChrome;
  var aAllowThirdPartyFixup = params.allowThirdPartyFixup;
  var aPostData             = params.postData;
  var aCharset              = params.charset;
  var aReferrerURI          = params.referrerURI;
  var aReferrerPolicy       = ('referrerPolicy' in params ?
      params.referrerPolicy : Ci.nsIHttpChannel.REFERRER_POLICY_DEFAULT);
  var aRelatedToCurrent     = params.relatedToCurrent;
  var aAllowMixedContent    = params.allowMixedContent;
  var aForceAllowDataURI    = params.forceAllowDataURI;
  var aInBackground         = params.inBackground;
  var aDisallowInheritPrincipal = params.disallowInheritPrincipal;
  var aInitiatingDoc        = params.initiatingDoc;
  var aIsPrivate            = params.private;
  var aSkipTabAnimation     = params.skipTabAnimation;
  var aAllowPinnedTabHostChange = !!params.allowPinnedTabHostChange;
  var aNoReferrer           = params.noReferrer;
  var aAllowPopups          = !!params.allowPopups;
  var aIndicateErrorPageLoad = params.indicateErrorPageLoad;
  var aPrincipal            = params.originPrincipal;
  var aTriggeringPrincipal  = params.triggeringPrincipal;
  var aForceAboutBlankViewerInCurrent =
      params.forceAboutBlankViewerInCurrent;

  // Establish a window in which we're running this code.
  var w = getTopWin();

  if ((where == "tab" || where == "tabshifted") &&
      w && !w.toolbar.visible) {
    w = getTopWin(true);
    aRelatedToCurrent = false;
  }

  // Can only do this after we're sure of what |w| will be the rest of this function.
  // Note that if |w| is null we might have no current browser (we'll open a new window).
  var aCurrentBrowser = params.currentBrowser || (w && w.gBrowser.selectedBrowser);

  if (where == "save") {
    // TODO(1073187): propagate referrerPolicy.

    // ContentClick.jsm passes isContentWindowPrivate for saveURL instead of passing a CPOW initiatingDoc
    if ("isContentWindowPrivate" in params) {
      saveURL(url, null, null, true, true, aNoReferrer ? null : aReferrerURI, null, params.isContentWindowPrivate);
    }
    else {
      if (!aInitiatingDoc) {
        Components.utils.reportError("openUILink/openLinkIn was called with " +
          "where == 'save' but without initiatingDoc.  See bug 814264.");
        return;
      }
      saveURL(url, null, null, true, true, aNoReferrer ? null : aReferrerURI, aInitiatingDoc);
    }
    return;
  }

  // Teach the principal about the right OA to use, e.g. in case when
  // opening a link in a new private window, or in a new container tab.
  // Please note we do not have to do that for SystemPrincipals and we
  // can not do it for NullPrincipals since NullPrincipals are only
  // identical if they actually are the same object (See Bug: 1346759)
  function useOAForPrincipal(principal) {
    if (principal && principal.isCodebasePrincipal) {
      let attrs = {
        privateBrowsingId: aIsPrivate || (w && PrivateBrowsingUtils.isWindowPrivate(w)),
      };
      return Services.scriptSecurityManager.createCodebasePrincipal(principal.URI, attrs);
    }
    return principal;
  }
  aPrincipal = useOAForPrincipal(aPrincipal);
  aTriggeringPrincipal = useOAForPrincipal(aTriggeringPrincipal);

  if (!w || where == "window") {
    // Strip referrer data when opening a new private window, to prevent
    // regular browsing data from leaking into it.
    if (aIsPrivate) {
      aNoReferrer = true;
    }    
    
    // This propagates to window.arguments.
    var sa = Cc["@mozilla.org/array;1"].
             createInstance(Ci.nsIMutableArray);

    var wuri = Cc["@mozilla.org/supports-string;1"].
               createInstance(Ci.nsISupportsString);
    wuri.data = url;

    let charset = null;
    if (aCharset) {
      charset = Cc["@mozilla.org/supports-string;1"]
                  .createInstance(Ci.nsISupportsString);
      charset.data = "charset=" + aCharset;
    }

    var allowThirdPartyFixupSupports = Cc["@mozilla.org/supports-PRBool;1"].
                                       createInstance(Ci.nsISupportsPRBool);
    allowThirdPartyFixupSupports.data = aAllowThirdPartyFixup;

    var referrerURISupports = null;
    if (aReferrerURI && !aNoReferrer) {
      referrerURISupports = Cc["@mozilla.org/supports-string;1"].
                            createInstance(Ci.nsISupportsString);
      referrerURISupports.data = aReferrerURI.spec;
    }

    var referrerPolicySupports = Cc["@mozilla.org/supports-PRUint32;1"].
                                 createInstance(Ci.nsISupportsPRUint32);
    referrerPolicySupports.data = aReferrerPolicy;

    sa.appendElement(wuri, /* weak =*/ false);
    sa.appendElement(charset, /* weak =*/ false);
    sa.appendElement(referrerURISupports, /* weak =*/ false);
    sa.appendElement(aPostData, /* weak =*/ false);
    sa.appendElement(allowThirdPartyFixupSupports, /* weak =*/ false);
    sa.appendElement(referrerPolicySupports, /* weak =*/ false);
    sa.appendElement(aPrincipal, /* weak =*/ false);
    sa.appendElement(aTriggeringPrincipal, /* weak =*/ false);

    let features = "chrome,dialog=no,all";
    if (aIsPrivate) {
      features += ",private";
    }

    Services.ww.openWindow(w || window, getBrowserURL(), null, features, sa);
    return;
  }

  let loadInBackground = where == "current" ? false : aInBackground;
  if (loadInBackground == null) {
    loadInBackground = aFromChrome ?
                         false :
                         Services.prefs.getBoolPref("browser.tabs.loadInBackground");
  }

  let uriObj;
  if (where == "current") {
    try {
      uriObj = Services.io.newURI(url, null, null);
    } catch (e) {}
  }

  // We avoid using |w| here because in the 'popup window' case,
  // if we pass a currentBrowser param |w.gBrowser| might not be the
  // tabbrowser that contains |aCurrentBrowser|. We really only care
  // about the tab linked to |aCurrentBrowser|.
  let tab = aCurrentBrowser.getTabBrowser().getTabForBrowser(aCurrentBrowser);
  if (where == "current" && tab.pinned &&
      !aAllowPinnedTabHostChange) {
    try {
      // nsIURI.host can throw for non-nsStandardURL nsIURIs.
      if (!uriObj || (!uriObj.schemeIs("javascript") &&
                      aCurrentBrowser.currentURI.host != uriObj.host)) {
        where = "tab";
        loadInBackground = false;
      }
    } catch (err) {
      where = "tab";
      loadInBackground = false;
    }
  }

  // Raise the target window before loading the URI, since loading it may
  // result in a new frontmost window (e.g. "javascript:window.open('');").
  w.focus();

  let browserUsedForLoad = null;
  switch (where) {
  case "current":
    let flags = Ci.nsIWebNavigation.LOAD_FLAGS_NONE;

    if (aAllowThirdPartyFixup) {
      flags |= Ci.nsIWebNavigation.LOAD_FLAGS_ALLOW_THIRD_PARTY_FIXUP;
      flags |= Ci.nsIWebNavigation.LOAD_FLAGS_FIXUP_SCHEME_TYPOS;
    }

    // LOAD_FLAGS_DISALLOW_INHERIT_PRINCIPAL isn't supported for javascript URIs,
    // i.e. it causes them not to load at all. Callers should strip
    // "javascript:" from pasted strings to protect users from malicious URIs
    // (see stripUnsafeProtocolOnPaste).
    if (aDisallowInheritPrincipal && !(uriObj && uriObj.schemeIs("javascript"))) {
      flags |= Ci.nsIWebNavigation.LOAD_FLAGS_DISALLOW_INHERIT_PRINCIPAL;
    }

    if (aAllowPopups) {
      flags |= Ci.nsIWebNavigation.LOAD_FLAGS_ALLOW_POPUPS;
    }
    if (aIndicateErrorPageLoad) {
      flags |= Ci.nsIWebNavigation.LOAD_FLAGS_ERROR_LOAD_CHANGES_RV;
    }
    if (aForceAllowDataURI) {
      flags |= Ci.nsIWebNavigation.LOAD_FLAGS_FORCE_ALLOW_DATA_URI;
    }

    let {URI_INHERITS_SECURITY_CONTEXT} = Ci.nsIProtocolHandler;
    if (aForceAboutBlankViewerInCurrent &&
        (!uriObj ||
         (Services.io.getProtocolFlags(uriObj.scheme) & URI_INHERITS_SECURITY_CONTEXT))) {
      // Unless we know for sure we're not inheriting principals,
      // force the about:blank viewer to have the right principal:
      aCurrentBrowser.createAboutBlankContentViewer(aPrincipal);
    }

    aCurrentBrowser.loadURIWithFlags(url, {
      triggeringPrincipal: aTriggeringPrincipal,
      flags: flags,
      referrerURI: aNoReferrer ? null : aReferrerURI,
      referrerPolicy: aReferrerPolicy,
      postData: aPostData
    });
    browserUsedForLoad = aCurrentBrowser;
    break;
  case "tabshifted":
    loadInBackground = !loadInBackground;
    // fall through
  case "tab":
    let tabUsedForLoad = w.gBrowser.loadOneTab(url, {
      referrerURI: aReferrerURI,
      referrerPolicy: aReferrerPolicy,
      charset: aCharset,
      postData: aPostData,
      inBackground: loadInBackground,
      allowThirdPartyFixup: aAllowThirdPartyFixup,
      relatedToCurrent: aRelatedToCurrent,
      skipAnimation: aSkipTabAnimation,
      allowMixedContent: aAllowMixedContent,
      noReferrer: aNoReferrer,
      originPrincipal: aPrincipal,
      triggeringPrincipal: aTriggeringPrincipal,
    });
    browserUsedForLoad = tabUsedForLoad.linkedBrowser;
    break;
  }

  // Focus the content, but only if the browser used for the load is selected.
  if (browserUsedForLoad &&
      browserUsedForLoad == browserUsedForLoad.getTabBrowser().selectedBrowser) {
    browserUsedForLoad.focus();
  }

  if (!loadInBackground && w.isBlankPageURL(url)) {
    w.focusAndSelectUrlBar();
  }
}

// Used as an onclick handler for UI elements with link-like behavior.
// e.g. onclick="checkForMiddleClick(this, event);"
function checkForMiddleClick(node, event) {
  // We should be using the disabled property here instead of the attribute,
  // but some elements that this function is used with don't support it (e.g.
  // menuitem).
  if (node.getAttribute("disabled") == "true")
    return; // Do nothing

  if (event.button == 1) {
    /* Execute the node's oncommand or command.
     *
     * XXX: we should use node.oncommand(event) once bug 246720 is fixed.
     */
    var target = node.hasAttribute("oncommand") ? node :
                 node.ownerDocument.getElementById(node.getAttribute("command"));
    var fn = new Function("event", target.getAttribute("oncommand"));
    fn.call(target, event);

    // If the middle-click was on part of a menu, close the menu.
    // (Menus close automatically with left-click but not with middle-click.)
    closeMenus(event.target);
  }
}

// Closes all popups that are ancestors of the node.
function closeMenus(node)
{
  if ("tagName" in node) {
    if (node.namespaceURI == "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
    && (node.tagName == "menupopup" || node.tagName == "popup"))
      node.hidePopup();

    closeMenus(node.parentNode);
  }
}

/** This function takes in a key element and compares it to the keys pressed during an event.
 *
 * @param aEvent
 *        The KeyboardEvent event you want to compare against your key.
 *
 * @param aKey
 *        The <key> element checked to see if it was called in aEvent.
 *        For example, aKey can be a variable set to document.getElementById("key_close")
 *        to check if the close command key was pressed in aEvent.
*/
function eventMatchesKey(aEvent, aKey)
{
  let keyPressed = aKey.getAttribute("key").toLowerCase();
  let keyModifiers = aKey.getAttribute("modifiers");
  let modifiers = ["Alt", "Control", "Meta", "Shift"];

  if (aEvent.key != keyPressed) {
    return false;
  }
  let eventModifiers = modifiers.filter(modifier => aEvent.getModifierState(modifier));
  // Check if aEvent has a modifier and aKey doesn't
  if (eventModifiers.length > 0 && keyModifiers.length == 0) {
     return false;
  }
  // Check whether aKey's modifiers match aEvent's modifiers
  if (keyModifiers) {
    keyModifiers = keyModifiers.split(/[\s,]+/);
    // Capitalize first letter of aKey's modifers to compare to aEvent's modifier
    keyModifiers.forEach(function(modifier, index) {
      if (modifier == "accel") {
        keyModifiers[index] = AppConstants.platform == "macosx" ?  "Meta" : "Control";
      } else {
        keyModifiers[index] = modifier[0].toUpperCase() + modifier.slice(1);
      }
    });
    return modifiers.every(modifier => keyModifiers.includes(modifier) == aEvent.getModifierState(modifier));
  }
  return true;
}

// Gather all descendent text under given document node.
function gatherTextUnder ( root )
{
  var text = "";
  var node = root.firstChild;
  var depth = 1;
  while ( node && depth > 0 ) {
    // See if this node is text.
    if ( node.nodeType == Node.TEXT_NODE ) {
      // Add this text to our collection.
      text += " " + node.data;
    } else if ( node instanceof HTMLImageElement) {
      // If it has an "alt" attribute, add that.
      var altText = node.getAttribute( "alt" );
      if ( altText && altText != "" ) {
        text += " " + altText;
      }
    }
    // Find next node to test.
    // First, see if this node has children.
    if ( node.hasChildNodes() ) {
      // Go to first child.
      node = node.firstChild;
      depth++;
    } else {
      // No children, try next sibling (or parent next sibling).
      while ( depth > 0 && !node.nextSibling ) {
        node = node.parentNode;
        depth--;
      }
      if ( node.nextSibling ) {
        node = node.nextSibling;
      }
    }
  }
  // Strip leading and tailing whitespace.
  text = text.trim();
  // Compress remaining whitespace.
  text = text.replace( /\s+/g, " " );
  return text;
}

// This function exists for legacy reasons.
function getShellService()
{
  return ShellService;
}

function isBidiEnabled() {
  // first check the pref.
  if (Services.prefs.getBoolPref("bidi.browser.ui", false))
    return true;

  // then check intl.uidirection.<locale>
  var chromeReg = Components.classes["@mozilla.org/chrome/chrome-registry;1"].
                  getService(Components.interfaces.nsIXULChromeRegistry);
  if (chromeReg.isLocaleRTL("global"))
    return true;

  // now see if the system locale is an RTL one.
  var rv = false;

  try {
    var localeService = Components.classes["@mozilla.org/intl/nslocaleservice;1"]
                                  .getService(Components.interfaces.nsILocaleService);
    var systemLocale = localeService.getSystemLocale().getCategory("NSILOCALE_CTYPE").substr(0, 3);

    switch (systemLocale) {
      case "ar-":
      case "he-":
      case "fa-":
      case "ug-":
      case "ur-":
      case "syr":
        rv = true;
        Services.prefs.setBoolPref("bidi.browser.ui", true);
    }
  } catch (e) {}

  return rv;
}

function openAboutDialog() {
  var enumerator = Services.wm.getEnumerator("Browser:About");
  while (enumerator.hasMoreElements()) {
    // Only open one about window (Bug 599573)
    let win = enumerator.getNext();
    if (win.closed) {
      continue;
    }
    win.focus();
    return;
  }

  var features = "chrome,";
  if (AppConstants.platform == "win") {
    features += "centerscreen,dependent";
  } else if (AppConstants.platform == "macosx") {
    features += "resizable=no,minimizable=no";
  } else {
    features += "centerscreen,dependent,dialog=no";
  }

  window.openDialog("chrome://browser/content/aboutDialog.xul", "", features);
}

function openPreferences(paneID, extraArgs)
{
  function switchToAdvancedSubPane(doc) {
    if (extraArgs && extraArgs["advancedTab"]) {
      let advancedPaneTabs = doc.getElementById("advancedPrefs");
      advancedPaneTabs.selectedTab = doc.getElementById(extraArgs["advancedTab"]);
    }
  }

  // This function is duplicated from preferences.js.
  function internalPrefCategoryNameToFriendlyName(aName) {
    return (aName || "").replace(/^pane./, function(toReplace) { return toReplace[4].toLowerCase(); });
  }

  let win = Services.wm.getMostRecentWindow("navigator:browser");
  let friendlyCategoryName = internalPrefCategoryNameToFriendlyName(paneID);
  let params;
  if (extraArgs && extraArgs["urlParams"]) {
    params = new URLSearchParams();
    let urlParams = extraArgs["urlParams"];
    for (let name in urlParams) {
      if (urlParams[name] !== undefined) {
        params.set(name, urlParams[name]);
      }
    }
  }
  let preferencesURL = "about:preferences" + (params ? "?" + params : "") +
                       (friendlyCategoryName ? "#" + friendlyCategoryName : "");
  let newLoad = true;
  let browser = null;
  if (!win) {
    const Cc = Components.classes;
    const Ci = Components.interfaces;
    let windowArguments = Cc["@mozilla.org/array;1"]
                            .createInstance(Ci.nsIMutableArray);
    let supportsStringPrefURL = Cc["@mozilla.org/supports-string;1"]
                                  .createInstance(Ci.nsISupportsString);
    supportsStringPrefURL.data = preferencesURL;
    windowArguments.appendElement(supportsStringPrefURL, /* weak =*/ false);

    win = Services.ww.openWindow(null, Services.prefs.getCharPref("browser.chromeURL"),
                                 "_blank", "chrome,dialog=no,all", windowArguments);
  } else {
    let shouldReplaceFragment = friendlyCategoryName ? "whenComparingAndReplace" : "whenComparing";
    newLoad = !win.switchToTabHavingURI(preferencesURL, true, { ignoreFragment: shouldReplaceFragment, replaceQueryString: true });
    browser = win.gBrowser.selectedBrowser;
  }

  if (newLoad) {
    Services.obs.addObserver(function advancedPaneLoadedObs(prefWin, topic, data) {
      if (!browser) {
        browser = win.gBrowser.selectedBrowser;
      }
      if (prefWin != browser.contentWindow) {
        return;
      }
      Services.obs.removeObserver(advancedPaneLoadedObs, "advanced-pane-loaded");
      switchToAdvancedSubPane(browser.contentDocument);
    }, "advanced-pane-loaded", false);
  } else {
    if (paneID) {
      browser.contentWindow.gotoPref(paneID);
    }
    switchToAdvancedSubPane(browser.contentDocument);
  }
}

function openAdvancedPreferences(tabID)
{
  openPreferences("paneAdvanced", { "advancedTab" : tabID });
}

/**
 * Opens the troubleshooting information (about:support) page for this version
 * of the application.
 */
function openTroubleshootingPage()
{
  openUILinkIn("about:support", "tab");
}

/**
 * Opens the troubleshooting information (about:support) page for this version
 * of the application.
 */
function openHealthReport()
{
  openUILinkIn("about:healthreport", "tab");
}

/**
 * Opens the feedback page for this version of the application.
 */
function openFeedbackPage()
{
  var url = Components.classes["@mozilla.org/toolkit/URLFormatterService;1"]
                      .getService(Components.interfaces.nsIURLFormatter)
                      .formatURLPref("app.feedback.baseURL");
  openUILinkIn(url, "tab");
}

function buildHelpMenu()
{
  // Enable/disable the "Report Web Forgery" menu item.
  if (typeof gSafeBrowsing != "undefined")
    gSafeBrowsing.setReportPhishingMenu();
}

function isElementVisible(aElement)
{
  if (!aElement)
    return false;

  // If aElement or a direct or indirect parent is hidden or collapsed,
  // height, width or both will be 0.
  var bo = aElement.boxObject;
  return (bo.height > 0 && bo.width > 0);
}

function makeURLAbsolute(aBase, aUrl)
{
  // Note:  makeURI() will throw if aUri is not a valid URI
  return makeURI(aUrl, null, makeURI(aBase)).spec;
}

/**
 * openNewTabWith: opens a new tab with the given URL.
 *
 * @param aURL
 *        The URL to open (as a string).
 * @param aDocument
 *        Note this parameter is now ignored. There is no security check & no
 *        referrer header derived from aDocument (null case).
 * @param aPostData
 *        Form POST data, or null.
 * @param aEvent
 *        The triggering event (for the purpose of determining whether to open
 *        in the background), or null.
 * @param aAllowThirdPartyFixup
 *        If true, then we allow the URL text to be sent to third party services
 *        (e.g., Google's I Feel Lucky) for interpretation. This parameter may
 *        be undefined in which case it is treated as false.
 * @param [optional] aReferrer
 *        This will be used as the referrer. There will be no security check.
 * @param [optional] aReferrerPolicy
 *        Referrer policy - Ci.nsIHttpChannel.REFERRER_POLICY_*.
 */
function openNewTabWith(aURL, aDocument, aPostData, aEvent,
                        aAllowThirdPartyFixup, aReferrer, aReferrerPolicy) {

  // As in openNewWindowWith(), we want to pass the charset of the
  // current document over to a new tab.
  let originCharset = null;
  if (document.documentElement.getAttribute("windowtype") == "navigator:browser")
    originCharset = gBrowser.selectedBrowser.characterSet;

  openLinkIn(aURL, aEvent && aEvent.shiftKey ? "tabshifted" : "tab",
             { charset: originCharset,
               postData: aPostData,
               allowThirdPartyFixup: aAllowThirdPartyFixup,
               referrerURI: aReferrer,
               referrerPolicy: aReferrerPolicy,
             });
}

/**
 * @param aDocument
 *        Note this parameter is ignored. See openNewTabWith()
 */
function openNewWindowWith(aURL, aDocument, aPostData, aAllowThirdPartyFixup,
                           aReferrer, aReferrerPolicy) {
  // Extract the current charset menu setting from the current document and
  // use it to initialize the new browser window...
  let originCharset = null;
  if (document.documentElement.getAttribute("windowtype") == "navigator:browser")
    originCharset = gBrowser.selectedBrowser.characterSet;

  openLinkIn(aURL, "window",
             { charset: originCharset,
               postData: aPostData,
               allowThirdPartyFixup: aAllowThirdPartyFixup,
               referrerURI: aReferrer,
               referrerPolicy: aReferrerPolicy,
             });
}

function getHelpLinkURL(aHelpTopic) {
  var url = Components.classes["@mozilla.org/toolkit/URLFormatterService;1"]
                      .getService(Components.interfaces.nsIURLFormatter)
                      .formatURLPref("app.support.baseURL");
  return url + aHelpTopic;
}

// aCalledFromModal is optional
function openHelpLink(aHelpTopic, aCalledFromModal, aWhere) {
  var url = getHelpLinkURL(aHelpTopic);
  var where = aWhere;
  if (!aWhere)
    where = aCalledFromModal ? "window" : "tab";

  openUILinkIn(url, where);
}

function openPrefsHelp() {
  // non-instant apply prefwindows are usually modal, so we can't open in the topmost window,
  // since its probably behind the window.
  var instantApply = Services.prefs.getBoolPref("browser.preferences.instantApply");

  var helpTopic = document.getElementsByTagName("prefwindow")[0].currentPane.helpTopic;
  openHelpLink(helpTopic, !instantApply);
}

function trimURL(aURL) {
  // This function must not modify the given URL such that calling
  // nsIURIFixup::createFixupURI with the result will produce a different URI.

  // remove single trailing slash for http/https/ftp URLs
  let url = aURL.replace(/^((?:http|https|ftp):\/\/[^/]+)\/$/, "$1");

  // remove http://
  if (!url.startsWith("http://")) {
    return url;
  }
  let urlWithoutProtocol = url.substring(7);

  let flags = Services.uriFixup.FIXUP_FLAG_ALLOW_KEYWORD_LOOKUP |
              Services.uriFixup.FIXUP_FLAG_FIX_SCHEME_TYPOS;
  let fixedUpURL, expectedURLSpec;
  try {
    fixedUpURL = Services.uriFixup.createFixupURI(urlWithoutProtocol, flags);
    expectedURLSpec = makeURI(aURL).spec;
  } catch (ex) {
    return url;
  }
  if (fixedUpURL.spec == expectedURLSpec) {
    return urlWithoutProtocol;
  }
  return url;
}