1 files changed, 79 insertions, 0 deletions
diff --git a/chromium/chrome/browser/resources/chromeos/chromevox/chromevox/injected/script_installer.js b/chromium/chrome/browser/resources/chromeos/chromevox/chromevox/injected/script_installer.js
new file mode 100644
index 00000000000..4c112b5e4c8
--- /dev/null
+++ b/chromium/chrome/browser/resources/chromeos/chromevox/chromevox/injected/script_installer.js
@@ -0,0 +1,79 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+/**
+ * @fileoverview Defines the ScriptInstaller functions which install scripts
+ * into the web page (not a content script)
+ *
+ */
+
+goog.provide('cvox.ScriptInstaller');
+
+goog.require('cvox.DomUtil');
+
+/**
+ * URL pattern where we do not allow script installation.
+ * @type {RegExp}
+ */
+cvox.ScriptInstaller.blacklistPattern = /chrome:\/\/|chrome-extension:\/\//;
+
+/**
+ * Installs a script in the web page.
+ * @param {Array.<string>} srcs An array of URLs of scripts.
+ * @param {string} uid A unique id.  This function won't install the same set of
+ *      scripts twice.
+ * @param {function()=} opt_onload A function called when the script has loaded.
+ * @param {string=} opt_chromevoxScriptBase An optional chromevoxScriptBase
+ *     attribute to add.
+ * @return {boolean} False if the script already existed and this function
+ * didn't do anything.
+ */
+cvox.ScriptInstaller.installScript = function(srcs, uid, opt_onload,
+    opt_chromevoxScriptBase) {
+  if (cvox.ScriptInstaller.blacklistPattern.test(document.URL)) {
+    return false;
+  }
+  if (document.querySelector('script[' + uid + ']')) {
+    return false;
+  }
+  if (!srcs) {
+    return false;
+  }
+  for (var i = 0, scriptSrc; scriptSrc = srcs[i]; i++) {
+    // Directly write the contents of the script we are trying to inject into
+    // the page.
+    var xhr = new XMLHttpRequest();
+    var url = scriptSrc + '?' + new Date().getTime();
+    xhr.onreadystatechange = function() {
+        if (xhr.readyState == 4) {
+          var scriptText = xhr.responseText;
+          // Add a magic comment to the bottom of the file so that
+          // Chrome knows the name of the script in the JavaScript debugger.
+          scriptText += '\n//# sourceURL=' + scriptSrc + '\n';
+
+          var apiScript = document.createElement('script');
+          apiScript.type = 'text/javascript';
+          apiScript.setAttribute(uid, '1');
+          apiScript.textContent = scriptText;
+          if (opt_chromevoxScriptBase) {
+            apiScript.setAttribute('chromevoxScriptBase',
+                opt_chromevoxScriptBase);
+          }
+          cvox.DomUtil.addNodeToHead(apiScript);
+        }
+      };
+    try {
+      xhr.open('GET', url, false);
+      xhr.send(null);
+    } catch (exception) {
+      window.console.log('Warning: ChromeVox external script loading for ' +
+          document.location + ' stopped after failing to install ' + scriptSrc);
+      return false;
+    }
+  }
+  if (opt_onload) {
+    opt_onload();
+  }
+  return true;
+};