Bug 731779: Integrate the Add-on SDK loader and API libraries into Firefox (uplifting from addon-sdk a16bbd5772880b578a939eeb65102bca6560d494)

addon-sdk/source/lib/sdk/loader/sandbox.js

@@ -0,0 +1,50 @@
+/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et: */
+/* 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/. */
+"use strict";
+
+module.metadata = {
+  "stability": "experimental"
+};
+
+const { Cc, Ci, CC, Cu } = require('chrome');
+const systemPrincipal = CC('@mozilla.org/systemprincipal;1', 'nsIPrincipal')();
+const scriptLoader = Cc['@mozilla.org/moz/jssubscript-loader;1'].
+                     getService(Ci.mozIJSSubScriptLoader);
+
+/**
+ * Make a new sandbox that inherits given `source`'s principals. Source can be
+ * URI string, DOMWindow or `null` for system principals.
+ */
+function sandbox(target, options) {
+  return Cu.Sandbox(target || systemPrincipal, options || {});
+}
+exports.sandbox = sandbox
+
+/**
+ * Evaluates given `source` in a given `sandbox` and returns result.
+ */
+function evaluate(sandbox, code, uri, line, version) {
+  return Cu.evalInSandbox(code, sandbox, version || '1.8', uri || '', line || 1);
+}
+exports.evaluate = evaluate;
+
+/**
+ * Evaluates code under the given `uri` in the given `sandbox`.
+ *
+ * @param {String} uri
+ *    The URL pointing to the script to load.
+ *    It must be a local chrome:, resource:, file: or data: URL.
+ */
+function load(sandbox, uri) {
+  if (uri.indexOf('data:') === 0) {
+    let source = uri.substr(uri.indexOf(',') + 1);
+
+    return evaluate(sandbox, decodeURIComponent(source), '1.8', uri, 0);
+  } else {
+    return scriptLoader.loadSubScript(uri, sandbox, 'UTF-8');
+  }
+}
+exports.load = load;