Bug 846635 - Use asynchronous getCharsetForURI in getShortcutOrURI

Issue mcp-graveyard/UXP#121

4 files changed, 304 insertions, 259 deletions

diff --git a/application/palemoon/base/content/browser.js b/application/palemoon/base/content/browser.js
index b2d260101e..73661a8c9c 100644
--- a/application/palemoon/base/content/browser.js
+++ b/application/palemoon/base/content/browser.js
@@ -9,6 +9,9 @@ var Cu = Components.utils;
 Cu.import("resource://gre/modules/XPCOMUtils.jsm");
 Cu.import("resource:///modules/RecentWindow.jsm");
 
+XPCOMUtils.defineLazyModuleGetter(this, "Task",
+                                  "resource://gre/modules/Task.jsm");
+
 XPCOMUtils.defineLazyModuleGetter(this, "CharsetMenu",
                                   "resource:///modules/CharsetMenu.jsm");
 
@@ -1896,88 +1899,89 @@ function loadURI(uri, referrer, postData, allowThirdPartyFixup) {
   } catch (e) {}
 }
 
-function getShortcutOrURI(aURL, aPostDataRef, aMayInheritPrincipal) {
-  // Initialize outparam to false
-  if (aMayInheritPrincipal)
-    aMayInheritPrincipal.value = false;
-
-  var shortcutURL = null;
-  var keyword = aURL;
-  var param = "";
-
-  var offset = aURL.indexOf(" ");
-  if (offset > 0) {
-    keyword = aURL.substr(0, offset);
-    param = aURL.substr(offset + 1);
-  }
-
-  if (!aPostDataRef)
-    aPostDataRef = {};
-
-  var engine = Services.search.getEngineByAlias(keyword);
-  if (engine) {
-    var submission = engine.getSubmission(param);
-    aPostDataRef.value = submission.postData;
-    return submission.uri.spec;
-  }
-
-  [shortcutURL, aPostDataRef.value] =
-    PlacesUtils.getURLAndPostDataForKeyword(keyword);
+function getShortcutOrURIAndPostData(aURL) {
+  return Task.spawn(function() {
+    let mayInheritPrincipal = false;
+    let postData = null;
+    let shortcutURL = null;
+    let keyword = aURL;
+    let param = "";
+
+    let offset = aURL.indexOf(" ");
+    if (offset > 0) {
+      keyword = aURL.substr(0, offset);
+      param = aURL.substr(offset + 1);
+    }
+
+    let engine = Services.search.getEngineByAlias(keyword);
+    if (engine) {
+      let submission = engine.getSubmission(param);
+      postData = submission.postData;
+      throw new Task.Result({ postData: submission.postData,
+                              url: submission.uri.spec,
+                              mayInheritPrincipal: mayInheritPrincipal });
+    }
+
+    [shortcutURL, postData] =
+      PlacesUtils.getURLAndPostDataForKeyword(keyword);
+
+    if (!shortcutURL)
+      throw new Task.Result({ postData: postData, url: aURL,
+                              mayInheritPrincipal: mayInheritPrincipal });
+
+    let escapedPostData = "";
+    if (postData)
+      escapedPostData = unescape(postData);
+
+    if (/%s/i.test(shortcutURL) || /%s/i.test(escapedPostData)) {
+      let charset = "";
+      const re = /^(.*)\&mozcharset=([a-zA-Z][_\-a-zA-Z0-9]+)\s*$/;
+      let matches = shortcutURL.match(re);
+      if (matches)
+        [, shortcutURL, charset] = matches;
+      else {
+        // Try to get the saved character-set.
+        try {
+          // makeURI throws if URI is invalid.
+          // Will return an empty string if character-set is not found.
+          charset = yield PlacesUtils.getCharsetForURI(makeURI(shortcutURL));
+        } catch (e) {}
+      }
 
-  if (!shortcutURL)
-    return aURL;
+      // encodeURIComponent produces UTF-8, and cannot be used for other charsets.
+      // escape() works in those cases, but it doesn't uri-encode +, @, and /.
+      // Therefore we need to manually replace these ASCII characters by their
+      // encodeURIComponent result, to match the behavior of nsEscape() with
+      // url_XPAlphas
+      let encodedParam = "";
+      if (charset && charset != "UTF-8")
+        encodedParam = escape(convertFromUnicode(charset, param)).
+                       replace(/[+@\/]+/g, encodeURIComponent);
+      else // Default charset is UTF-8
+        encodedParam = encodeURIComponent(param);
 
-  var postData = "";
-  if (aPostDataRef.value)
-    postData = unescape(aPostDataRef.value);
+      shortcutURL = shortcutURL.replace(/%s/g, encodedParam).replace(/%S/g, param);
 
-  if (/%s/i.test(shortcutURL) || /%s/i.test(postData)) {
-    var charset = "";
-    const re = /^(.*)\&mozcharset=([a-zA-Z][_\-a-zA-Z0-9]+)\s*$/;
-    var matches = shortcutURL.match(re);
-    if (matches)
-      [, shortcutURL, charset] = matches;
-    else {
-      // Try to get the saved character-set.
-      try {
-        // makeURI throws if URI is invalid.
-        // Will return an empty string if character-set is not found.
-        charset = PlacesUtils.history.getCharsetForURI(makeURI(shortcutURL));
-      } catch (e) {}
+      if (/%s/i.test(escapedPostData)) // POST keyword
+        postData = getPostDataStream(escapedPostData, param, encodedParam,
+                                               "application/x-www-form-urlencoded");
     }
+    else if (param) {
+      // This keyword doesn't take a parameter, but one was provided. Just return
+      // the original URL.
+      postData = null;
 
-    // encodeURIComponent produces UTF-8, and cannot be used for other charsets.
-    // escape() works in those cases, but it doesn't uri-encode +, @, and /.
-    // Therefore we need to manually replace these ASCII characters by their
-    // encodeURIComponent result, to match the behavior of nsEscape() with
-    // url_XPAlphas
-    var encodedParam = "";
-    if (charset && charset != "UTF-8")
-      encodedParam = escape(convertFromUnicode(charset, param)).
-                     replace(/[+@\/]+/g, encodeURIComponent);
-    else // Default charset is UTF-8
-      encodedParam = encodeURIComponent(param);
-
-    shortcutURL = shortcutURL.replace(/%s/g, encodedParam).replace(/%S/g, param);
-
-    if (/%s/i.test(postData)) // POST keyword
-      aPostDataRef.value = getPostDataStream(postData, param, encodedParam,
-                                             "application/x-www-form-urlencoded");
-  }
-  else if (param) {
-    // This keyword doesn't take a parameter, but one was provided. Just return
-    // the original URL.
-    aPostDataRef.value = null;
-
-    return aURL;
-  }
+      throw new Task.Result({ postData: postData, url: aURL,
+                              mayInheritPrincipal: mayInheritPrincipal });
+    }
 
-  // This URL came from a bookmark, so it's safe to let it inherit the current
-  // document's principal.
-  if (aMayInheritPrincipal)
-    aMayInheritPrincipal.value = true;
+    // This URL came from a bookmark, so it's safe to let it inherit the current
+    // document's principal.
+    mayInheritPrincipal = true;
 
-  return shortcutURL;
+    throw new Task.Result({ postData: postData, url: shortcutURL,
+                            mayInheritPrincipal: mayInheritPrincipal });
+  });
 }
 
 function getPostDataStream(aStringData, aKeyword, aEncKeyword, aType) {
@@ -2722,12 +2726,13 @@ var newTabButtonObserver = {
   onDrop: function (aEvent)
   {
     let url = browserDragAndDrop.drop(aEvent, { });
-    var postData = {};
-    url = getShortcutOrURI(url, postData);
-    if (url) {
-      // allow third-party services to fixup this URL
-      openNewTabWith(url, null, postData.value, aEvent, true);
-    }
+    Task.spawn(function() {
+      let data = yield getShortcutOrURIAndPostData(url);
+      if (data.url) {
+        // allow third-party services to fixup this URL
+        openNewTabWith(data.url, null, data.postData, aEvent, true);
+      }
+    });
   }
 }
 
@@ -2742,12 +2747,13 @@ var newWindowButtonObserver = {
   onDrop: function (aEvent)
   {
     let url = browserDragAndDrop.drop(aEvent, { });
-    var postData = {};
-    url = getShortcutOrURI(url, postData);
-    if (url) {
-      // allow third-party services to fixup this URL
-      openNewWindowWith(url, null, postData.value, true);
-    }
+    Task.spawn(function() {
+      let data = yield getShortcutOrURIAndPostData(url);
+      if (data.url) {
+        // allow third-party services to fixup this URL
+        openNewWindowWith(data.url, null, data.postData, true);
+      }
+    });
   }
 }
 
@@ -5035,36 +5041,52 @@ function middleMousePaste(event) {
   // bar's behavior (stripsurroundingwhitespace)
   clipboard = clipboard.replace(/\s*\n\s*/g, "");
 
-  let mayInheritPrincipal = { value: false };
-  let url = getShortcutOrURI(clipboard, mayInheritPrincipal);
-  try {
-    makeURI(url);
-  } catch (ex) {
-    // Not a valid URI.
-    return;
+  // if it's not the current tab, we don't need to do anything because the 
+  // browser doesn't exist.
+  let where = whereToOpenLink(event, true, false);
+  let lastLocationChange;
+  if (where == "current") {
+    lastLocationChange = gBrowser.selectedBrowser.lastLocationChange;
   }
 
-  try {
-    addToUrlbarHistory(url);
-  } catch (ex) {
-    // Things may go wrong when adding url to session history,
-    // but don't let that interfere with the loading of the url.
-    Cu.reportError(ex);
-  }
+  Task.spawn(function() {
+    let data = yield getShortcutOrURIAndPostData(clipboard);
+    try {
+      makeURI(data.url);
+    } catch (ex) {
+      // Not a valid URI.
+      return;
+    }
+
+    try {
+      addToUrlbarHistory(data.url);
+    } catch (ex) {
+      // Things may go wrong when adding url to session history,
+      // but don't let that interfere with the loading of the url.
+      Cu.reportError(ex);
+    }
 
-  openUILink(url, event,
-             { ignoreButton: true,
-               disallowInheritPrincipal: !mayInheritPrincipal.value });
+    if (where != "current" ||
+        lastLocationChange == gBrowser.selectedBrowser.lastLocationChange) {
+      openUILink(data.url, event,
+                 { ignoreButton: true,
+                   disallowInheritPrincipal: !data.mayInheritPrincipal });
+    }
+  });
 
   event.stopPropagation();
 }
 
 function handleDroppedLink(event, url, name)
 {
-  let postData = { };
-  let uri = getShortcutOrURI(url, postData);
-  if (uri)
-    loadURI(uri, null, postData.value, false);
+  let lastLocationChange = gBrowser.selectedBrowser.lastLocationChange;
+
+  Task.spawn(function() {
+    let data = yield getShortcutOrURIAndPostData(url);
+    if (data.url &&
+        lastLocationChange == gBrowser.selectedBrowser.lastLocationChange)
+      loadURI(data.url, null, data.postData, false);
+  });
 
   // Keep the event from being handled by the dragDrop listeners
   // built-in to goanna if they happen to be above us.
@@ -5179,7 +5201,6 @@ function charsetLoadListener() {
   }
 }
 
-
 var gPageStyleMenu = {
 
   _getAllStyleSheets: function (frameset) {
diff --git a/application/palemoon/base/content/openLocation.js b/application/palemoon/base/content/openLocation.js
index 5b731c7e86..b00dbc5715 100644
--- a/application/palemoon/base/content/openLocation.js
+++ b/application/palemoon/base/content/openLocation.js
@@ -16,6 +16,7 @@ try {
 }
 
 Components.utils.import("resource:///modules/openLocationLastURL.jsm", openLocationModule);
+Components.utils.import("resource://gre/modules/Task.jsm");
 let gOpenLocationLastURL = new openLocationModule.OpenLocationLastURL(window.opener);
 
 function onLoad()
@@ -61,45 +62,52 @@ function doEnabling()
 
 function open()
 {
-  var url;
-  var postData = {};
-  var mayInheritPrincipal = {value: false};
-  if (browser)
-    url = browser.getShortcutOrURI(dialog.input.value, postData, mayInheritPrincipal);
-  else
-    url = dialog.input.value;
+  Task.spawn(function() {
+    let url;
+    let postData = null;
+    let mayInheritPrincipal = false;
+
+    if (browser) {
+      let data = yield browser.getShortcutOrURIAndPostData(dialog.input.value);
+      url = data.url;
+      postData = data.postData;
+      mayInheritPrincipal = data.mayInheritPrincipal;
+    } else {
+      url = dialog.input.value;
+    }
 
-  try {
-    // Whichever target we use for the load, we allow third-party services to
-    // fixup the URI
-    switch (dialog.openWhereList.value) {
-      case "0":
-        var webNav = Components.interfaces.nsIWebNavigation;
-        var flags = webNav.LOAD_FLAGS_ALLOW_THIRD_PARTY_FIXUP |
-                    webNav.LOAD_FLAGS_FIXUP_SCHEME_TYPOS;
-        if (!mayInheritPrincipal.value)
-          flags |= webNav.LOAD_FLAGS_DISALLOW_INHERIT_OWNER;
-        browser.gBrowser.loadURIWithFlags(url, flags, null, null, postData.value);
-        break;
-      case "1":
-        window.opener.delayedOpenWindow(getBrowserURL(), "all,dialog=no",
-                                        url, postData.value, null, null, true);
-        break;
-      case "3":
-        browser.delayedOpenTab(url, null, null, postData.value, true);
-        break;
+    try {
+      // Whichever target we use for the load, we allow third-party services to
+      // fixup the URI
+      switch (dialog.openWhereList.value) {
+        case "0":
+          var webNav = Components.interfaces.nsIWebNavigation;
+          var flags = webNav.LOAD_FLAGS_ALLOW_THIRD_PARTY_FIXUP;
+          if (!mayInheritPrincipal)
+            flags |= webNav.LOAD_FLAGS_DISALLOW_INHERIT_OWNER;
+          browser.gBrowser.loadURIWithFlags(url, flags, null, null, postData);
+          break;
+        case "1":
+          window.opener.delayedOpenWindow(getBrowserURL(), "all,dialog=no",
+                                          url, postData, null, null, true);
+          break;
+        case "3":
+          browser.delayedOpenTab(url, null, null, postData, true);
+          break;
+      }
+    }
+    catch(exception) {
     }
-  }
-  catch(exception) {
-  }
 
-  if (pref) {
-    gOpenLocationLastURL.value = dialog.input.value;
-    pref.setIntPref("general.open_location.last_window_choice", dialog.openWhereList.value);
-  }
+    if (pref) {
+      gOpenLocationLastURL.value = dialog.input.value;
+      pref.setIntPref("general.open_location.last_window_choice", dialog.openWhereList.value);
+    }
+
+    // Delay closing slightly to avoid timing bug on Linux.
+    window.close();
+  });
 
-  // Delay closing slightly to avoid timing bug on Linux.
-  window.close();
   return false;
 }
 
diff --git a/application/palemoon/base/content/tabbrowser.xml b/application/palemoon/base/content/tabbrowser.xml
index 4b10855a74..4f713d76f4 100644
--- a/application/palemoon/base/content/tabbrowser.xml
+++ b/application/palemoon/base/content/tabbrowser.xml
@@ -738,8 +738,10 @@
                                              aFlags]);
               }
 
-              if (topLevel)
+              if (topLevel) {
                 this.mBrowser.lastURI = aLocation;
+                this.mBrowser.lastLocationChange = Date.now();
+              }
             },
 
             onStatusChange: function (aWebProgress, aRequest, aStatus, aMessage) {
diff --git a/application/palemoon/base/content/urlbarBindings.xml b/application/palemoon/base/content/urlbarBindings.xml
index c99819f0d3..e0bb40d64b 100644
--- a/application/palemoon/base/content/urlbarBindings.xml
+++ b/application/palemoon/base/content/urlbarBindings.xml
@@ -263,151 +263,165 @@
           var postData = null;
 
           var action = this._parseActionUrl(url);
-          if (action) {
-            url = action.param;
-            if (this.hasAttribute("actiontype")) {
-              if (action.type == "switchtab") {
-                this.handleRevert();
-                let prevTab = gBrowser.selectedTab;
-                if (switchToTabHavingURI(url) &&
-                    isTabEmpty(prevTab))
-                  gBrowser.removeTab(prevTab);
+          let lastLocationChange = gBrowser.selectedBrowser.lastLocationChange;
+          Task.spawn(function() {
+            let matchLastLocationChange = true;
+            if (action) {
+              url = action.param;
+              if (this.hasAttribute("actiontype")) {
+                if (action.type == "switchtab") {
+                  this.handleRevert();
+                  let prevTab = gBrowser.selectedTab;
+                  if (switchToTabHavingURI(url) &&
+                      isTabEmpty(prevTab))
+                    gBrowser.removeTab(prevTab);
+                }
+                return;
               }
-              return;
             }
-          }
-          else {
-            [url, postData, mayInheritPrincipal] = this._canonizeURL(aTriggeringEvent);
-            if (!url)
-              return;
-          }
+            else {
+              [url, postData, mayInheritPrincipal] = yield this._canonizeURL(aTriggeringEvent);
+              matchLastLocationChange = (lastLocationChange ==
+                                         gBrowser.selectedBrowser.lastLocationChange);
+              if (!url)
+                return;
+            }
 
-          this.value = url;
-          gBrowser.userTypedValue = url;
-          try {
-            addToUrlbarHistory(url);
-          } catch (ex) {
-            // Things may go wrong when adding url to session history,
-            // but don't let that interfere with the loading of the url.
-            Cu.reportError(ex);
-          }
+            this.value = url;
+            gBrowser.userTypedValue = url;
+            try {
+              addToUrlbarHistory(url);
+            } catch (ex) {
+              // Things may go wrong when adding url to session history,
+              // but don't let that interfere with the loading of the url.
+              Cu.reportError(ex);
+            }
 
-          function loadCurrent() {
-            let webnav = Ci.nsIWebNavigation;
-            let flags = webnav.LOAD_FLAGS_ALLOW_THIRD_PARTY_FIXUP |
-                        webnav.LOAD_FLAGS_FIXUP_SCHEME_TYPOS;
-            // Pass LOAD_FLAGS_DISALLOW_INHERIT_OWNER to prevent any loads from
-            // inheriting the currently loaded document's principal, unless this
-            // URL is marked as safe to inherit (e.g. came from a bookmark
-            // keyword).
-            if (!mayInheritPrincipal)
-              flags |= Ci.nsIWebNavigation.LOAD_FLAGS_DISALLOW_INHERIT_OWNER;
-            gBrowser.loadURIWithFlags(url, flags, null, null, postData);
-          }
+            function loadCurrent() {
+              let flags = Ci.nsIWebNavigation.LOAD_FLAGS_ALLOW_THIRD_PARTY_FIXUP;
+              // Pass LOAD_FLAGS_DISALLOW_INHERIT_OWNER to prevent any loads from
+              // inheriting the currently loaded document's principal, unless this
+              // URL is marked as safe to inherit (e.g. came from a bookmark
+              // keyword).
+              if (!mayInheritPrincipal)
+                flags |= Ci.nsIWebNavigation.LOAD_FLAGS_DISALLOW_INHERIT_OWNER;
+              // If the value wasn't typed, we know that we decoded the value as
+              // UTF-8 (see losslessDecodeURI)
+              if (!this.valueIsTyped)
+                flags |= Ci.nsIWebNavigation.LOAD_FLAGS_URI_IS_UTF8;
+              gBrowser.loadURIWithFlags(url, flags, null, null, postData);
+            }
 
-          // Focus the content area before triggering loads, since if the load
-          // occurs in a new tab, we want focus to be restored to the content
-          // area when the current tab is re-selected.
-          gBrowser.selectedBrowser.focus();
+            // Focus the content area before triggering loads, since if the load
+            // occurs in a new tab, we want focus to be restored to the content
+            // area when the current tab is re-selected.
+            gBrowser.selectedBrowser.focus();
 
-          let isMouseEvent = aTriggeringEvent instanceof MouseEvent;
-          let altEnter = !isMouseEvent && aTriggeringEvent && aTriggeringEvent.altKey;
+            let isMouseEvent = aTriggeringEvent instanceof MouseEvent;
+            let altEnter = !isMouseEvent && aTriggeringEvent && aTriggeringEvent.altKey;
 
-          if (altEnter) {
-            // XXX This was added a long time ago, and I'm not sure why it is
-            // necessary. Alt+Enter's default action might cause a system beep,
-            // or something like that?
-            aTriggeringEvent.preventDefault();
-            aTriggeringEvent.stopPropagation();
-          }
+            if (altEnter) {
+              // XXX This was added a long time ago, and I'm not sure why it is
+              // necessary. Alt+Enter's default action might cause a system beep,
+              // or something like that?
+              aTriggeringEvent.preventDefault();
+              aTriggeringEvent.stopPropagation();
+            }
 
-          // If the current tab is empty, ignore Alt+Enter (just reuse this tab)
-          altEnter = altEnter && !isTabEmpty(gBrowser.selectedTab);
+            // If the current tab is empty, ignore Alt+Enter (just reuse this tab)
+            altEnter = altEnter && !isTabEmpty(gBrowser.selectedTab);
 
-          if (isMouseEvent || altEnter) {
-            // Use the standard UI link behaviors for clicks or Alt+Enter
-            let where = "tab";
-            if (isMouseEvent)
-              where = whereToOpenLink(aTriggeringEvent, false, false);
+            if (isMouseEvent || altEnter) {
+              // Use the standard UI link behaviors for clicks or Alt+Enter
+              let where = "tab";
+              if (isMouseEvent)
+                where = whereToOpenLink(aTriggeringEvent, false, false);
 
-            if (where == "current") {
-              loadCurrent();
+              if (where == "current") {
+                if (matchLastLocationChange) {
+                  loadCurrent();
+                }
+              } else {
+                this.handleRevert();
+                let params = { allowThirdPartyFixup: true,
+                               postData: postData,
+                               initiatingDoc: document };
+                if (!this.valueIsTyped)
+                  params.isUTF8 = true;
+                openUILinkIn(url, where, params);
+              }
             } else {
-              this.handleRevert();
-              let params = { allowThirdPartyFixup: true,
-                             postData: postData,
-                             initiatingDoc: document };
-              openUILinkIn(url, where, params);
+              if (matchLastLocationChange) {
+                loadCurrent();
+              }
             }
-          } else {
-            loadCurrent();
-          }
+          }.bind(this));
         ]]></body>
       </method>
 
       <method name="_canonizeURL">
         <parameter name="aTriggeringEvent"/>
         <body><![CDATA[
-          var url = this.value;
-          if (!url)
-            return ["", null, false];
+          return Task.spawn(function() {
+            var url = this.value;
+            if (!url)
+              throw new Task.Result(["", null, false]);
 
-          // Only add the suffix when the URL bar value isn't already "URL-like",
-          // and only if we get a keyboard event, to match user expectations.
-          if (/^\s*[^.:\/\s]+(?:\/.*|\s*)$/i.test(url) &&
-              (aTriggeringEvent instanceof KeyEvent)) {
+            // Only add the suffix when the URL bar value isn't already "URL-like",
+            // and only if we get a keyboard event, to match user expectations.
+            if (/^\s*[^.:\/\s]+(?:\/.*|\s*)$/i.test(url) &&
+                (aTriggeringEvent instanceof KeyEvent)) {
 #ifdef XP_MACOSX
-            let accel = aTriggeringEvent.metaKey;
+              let accel = aTriggeringEvent.metaKey;
 #else
-            let accel = aTriggeringEvent.ctrlKey;
+              let accel = aTriggeringEvent.ctrlKey;
 #endif
-            let shift = aTriggeringEvent.shiftKey;
+              let shift = aTriggeringEvent.shiftKey;
+
+              let suffix = "";
+
+              switch (true) {
+                case (accel && shift):
+                  suffix = ".org/";
+                  break;
+                case (shift):
+                  suffix = ".net/";
+                  break;
+                case (accel):
+                  try {
+                    suffix = gPrefService.getCharPref("browser.fixup.alternate.suffix");
+                    if (suffix.charAt(suffix.length - 1) != "/")
+                      suffix += "/";
+                  } catch(e) {
+                    suffix = ".com/";
+                  }
+                  break;
+              }
 
-            let suffix = "";
+              if (suffix) {
+                // trim leading/trailing spaces (bug 233205)
+                url = url.trim();
 
-            switch (true) {
-              case (accel && shift):
-                suffix = ".org/";
-                break;
-              case (shift):
-                suffix = ".net/";
-                break;
-              case (accel):
-                try {
-                  suffix = gPrefService.getCharPref("browser.fixup.alternate.suffix");
-                  if (suffix.charAt(suffix.length - 1) != "/")
-                    suffix += "/";
-                } catch(e) {
-                  suffix = ".com/";
-                }
-                break;
-            }
+                // Tack www. and suffix on.  If user has appended directories, insert
+                // suffix before them (bug 279035).  Be careful not to get two slashes.
 
-            if (suffix) {
-              // trim leading/trailing spaces (bug 233205)
-              url = url.trim();
+                let firstSlash = url.indexOf("/");
 
-              // Tack www. and suffix on.  If user has appended directories, insert
-              // suffix before them (bug 279035).  Be careful not to get two slashes.
-
-              let firstSlash = url.indexOf("/");
+                if (firstSlash >= 0) {
+                  url = url.substring(0, firstSlash) + suffix +
+                        url.substring(firstSlash + 1);
+                } else {
+                  url = url + suffix;
+                }
 
-              if (firstSlash >= 0) {
-                url = url.substring(0, firstSlash) + suffix +
-                      url.substring(firstSlash + 1);
-              } else {
-                url = url + suffix;
+                url = "http://www." + url;
               }
-
-              url = "http://www." + url;
             }
-          }
 
-          var postData = {};
-          var mayInheritPrincipal = { value: false };
-          url = getShortcutOrURI(url, postData, mayInheritPrincipal);
+            let data = yield getShortcutOrURIAndPostData(url);
 
-          return [url, postData.value, mayInheritPrincipal.value];
+            throw new Task.Result([data.url, data.postData, data.mayInheritPrincipal]);
+          }.bind(this));
         ]]></body>
       </method>