Change implementation of self module.

packages/api-utils/lib/self!.js

@@ -0,0 +1,99 @@
+/* vim:st=2:sts=2:sw=2:
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Jetpack.
+ *
+ * The Initial Developer of the Original Code is Mozilla.
+ * Portions created by the Initial Developer are Copyright (C) 2011
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Brian Warner <warner@mozilla.com>
+ *   Erik Vold <erikvvold@gmail.com>
+ *   Irakli Gozalishvili <gozala@mozilla.com>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+"use strict";
+
+const { CC } = require('chrome');
+const { jetpackID, name, manifest } = require('@packaging');
+
+const XMLHttpRequest = CC('@mozilla.org/xmlextras/xmlhttprequest;1',
+                          'nsIXMLHttpRequest');
+
+// Utility function that synchronously reads local resource from the given
+// `uri` and returns content string.
+function readURI(uri) {
+  let request = XMLHttpRequest();
+  request.open('GET', uri, false);
+  request.overrideMimeType('text/plain');
+  request.send();
+  return request.responseText;
+}
+
+
+// Some XPCOM APIs require valid URIs as an argument for certain operations (see
+// `nsILoginManager` for example). This property represents add-on associated
+// unique URI string that can be used for that.
+const uri = 'addon:' + jetpackID
+
+function url(root, path) root + (path || "")
+function read(root, path) readURI(url(root, path))
+
+exports.create = function create(base) {
+  let moduleData = manifest[base] && manifest[base].requirements['self'];
+
+  if (!moduleData) {
+    // we don't know where you live, so we must search for your data
+    // resource://api-utils-api-utils-tests/test-self.js
+    // make a prefix of resource://api-utils-api-utils-data/
+    let doubleslash = base.indexOf('//');
+    let prefix = base.slice(0, doubleslash + 2);
+    let rest = base.slice(doubleslash + 2);
+    let slash = rest.indexOf('/');
+    prefix = prefix + rest.slice(0, slash);
+    prefix = prefix.slice(0, prefix.lastIndexOf('-')) + '-data/';
+    moduleData = { dataURIPrefix: prefix };
+    // moduleData also wants mapName and mapSHA256, but they're
+    // currently unused
+  }
+
+  // a module loaded from URI has called require(MODULE)
+  // URI is like resource://jid0-$JID/$PACKAGE-$SECTION/$SUBDIR/$FILENAME
+  // resource://jid0-abc123/reading-data-lib/main.js
+  // and we want resource://jid0-abc123/reading-data-data/
+
+  return Object.freeze({
+    id: 'self',
+    exports: Object.freeze({
+      id: jetpackID,
+      uri: uri,
+      url: url.bind(null, moduleData.dataURIPrefix),
+      load: read.bind(null, moduleData.dataURIPrefix)
+    })
+  });
+};