Bug 877453 - Expose longdesc in image context menus. r=gavin ui-r=boriss

browser/base/content/browser-context.inc

@@ -180,6 +180,11 @@
                 label="&viewImageInfoCmd.label;"
                 accesskey="&viewImageInfoCmd.accesskey;"
                 oncommand="gContextMenu.viewImageInfo();"/>
+      <menuitem id="context-viewimagedesc"
+                label="&viewImageDescCmd.label;"
+                accesskey="&viewImageDescCmd.accesskey;"
+                oncommand="gContextMenu.viewImageDesc(event);"
+                onclick="checkForMiddleClick(this, event);"/>
       <menuitem id="context-savevideo"
                 label="&saveVideoCmd.label;"
                 accesskey="&saveVideoCmd.accesskey;"

browser/base/content/nsContextMenu.js

@@ -261,6 +261,7 @@ nsContextMenu.prototype = {
             .disabled = !this.hasBGImage;
 
     this.showItem("context-viewimageinfo", this.onImage);
+    this.showItem("context-viewimagedesc", this.onImage && this.imageDescURL !== "");
   },
 
   initMiscItems: function CM_initMiscItems() {
@@ -499,6 +500,7 @@ nsContextMenu.prototype = {
     this.onImage           = false;
     this.onLoadedImage     = false;
     this.onCompletedImage  = false;
+    this.imageDescURL      = "";
     this.onCanvas          = false;
     this.onVideo           = false;
     this.onAudio           = false;
@@ -548,6 +550,11 @@ nsContextMenu.prototype = {
           this.onCompletedImage = true;
 
         this.mediaURL = this.target.currentURI.spec;
+
+        var descURL = this.target.getAttribute("longdesc");
+        if (descURL) {
+          this.imageDescURL = makeURLAbsolute(this.target.ownerDocument.body.baseURI, descURL);
+        }
       }
       else if (this.target instanceof HTMLCanvasElement) {
         this.onCanvas = true;
@@ -874,6 +881,14 @@ nsContextMenu.prototype = {
                     "mediaTab", this.target);
   },
 
+  viewImageDesc: function(e) {
+    var doc = this.target.ownerDocument;
+    urlSecurityCheck(this.imageDescURL, this.browser.contentPrincipal,
+                     Ci.nsIScriptSecurityManager.DISALLOW_SCRIPT);
+    openUILink(this.imageDescURL, e, { disallowInheritPrincipal: true,
+                             referrerURI: doc.documentURIObject });
+  },
+
   viewFrameInfo: function() {
     BrowserPageInfo(this.target.ownerDocument);
   },

browser/base/content/test/subtst_contextmenu.html

@@ -66,5 +66,6 @@ Browser context menu subtest.
 <input id="test-select-input-text" type="text" value="input">
 <input id="test-select-input-text-type-password" type="password" value="password">
 <embed id="test-plugin" style="width: 200px; height: 200px;" type="application/x-test"></embed>
+<img id="test-longdesc" src="ctxmenu-image.png" longdesc="http://www.mozilla.org"></embed>
 </body>
 </html>

browser/base/content/test/test_contextmenu.html

@@ -939,6 +939,22 @@ function runTest(testNum) {
             tag.enabledState = SpecialPowers.Ci.nsIPluginTag.STATE_ENABLED;
           }
         }
+        openContextMenuFor(longdesc);
+        return;
+
+    case 30:
+        // Context menu for an image with longdesc
+        checkContextMenu(["context-viewimage",            true,
+                          "context-copyimage-contents",   true,
+                          "context-copyimage",            true,
+                          "---",                          null,
+                          "context-saveimage",            true,
+                          "context-sendimage",            true,
+                          "context-setDesktopBackground", true,
+                          "context-viewimageinfo",        true,
+                          "context-viewimagedesc",        true
+                         ].concat(inspectItems));
+        closeContextMenu();
 
         // finish test
         subwindow.close();
@@ -968,7 +984,7 @@ var text, link, mailto, input, img, canvas, video_ok, video_bad, video_bad2,
     iframe, video_in_iframe, image_in_iframe, textarea, contenteditable,
     inputspell, pagemenu, dom_full_screen, plainTextItems, audio_in_video,
     selecttext, selecttextlink, imagelink, select_inputtext, select_inputtext_password,
-    plugin;
+    plugin, longdesc;
 
 function startTest() {
     chromeWin = SpecialPowers.wrap(subwindow)
@@ -1017,6 +1033,7 @@ function startTest() {
     select_inputtext = subwindow.document.getElementById("test-select-input-text");
     select_inputtext_password = subwindow.document.getElementById("test-select-input-text-type-password");
     plugin = subwindow.document.getElementById("test-plugin");
+    longdesc = subwindow.document.getElementById("test-longdesc");
 
     contextMenu.addEventListener("popupshown", function() { runTest(++testNum); }, false);
     runTest(1);

browser/locales/en-US/chrome/browser/browser.dtd

@@ -408,6 +408,8 @@ These should match what Safari and other Apple applications use on OS X Lion. --
 <!ENTITY viewImageCmd.accesskey       "I">
 <!ENTITY viewImageInfoCmd.label       "View Image Info">
 <!ENTITY viewImageInfoCmd.accesskey   "f">
+<!ENTITY viewImageDescCmd.label       "View Description">
+<!ENTITY viewImageDescCmd.accesskey   "D">
 <!ENTITY viewVideoCmd.label           "View Video">
 <!ENTITY viewVideoCmd.accesskey       "I">
 <!ENTITY viewBGImageCmd.label         "View Background Image">