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  1. /*******************************************************************************
  2. µBlock - a browser extension to block requests.
  3. Copyright (C) 2014 The µBlock authors
  4. This program is free software: you can redistribute it and/or modify
  5. it under the terms of the GNU General Public License as published by
  6. the Free Software Foundation, either version 3 of the License, or
  7. (at your option) any later version.
  8. This program is distributed in the hope that it will be useful,
  9. but WITHOUT ANY WARRANTY; without even the implied warranty of
  10. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  11. GNU General Public License for more details.
  12. You should have received a copy of the GNU General Public License
  13. along with this program. If not, see {http://www.gnu.org/licenses/}.
  14. Home: https://github.com/gorhill/uMatrix
  15. */
  16. 'use strict';
  17. /******************************************************************************/
  18. this.EXPORTED_SYMBOLS = ['contentObserver'];
  19. const {interfaces: Ci, utils: Cu} = Components;
  20. const {Services} = Cu.import('resource://gre/modules/Services.jsm', null);
  21. const {XPCOMUtils} = Cu.import('resource://gre/modules/XPCOMUtils.jsm', null);
  22. const hostName = Services.io.newURI(Components.stack.filename, null, null).host;
  23. // Cu.import('resource://gre/modules/devtools/Console.jsm');
  24. /******************************************************************************/
  25. const getMessageManager = function(win) {
  26. return win
  27. .QueryInterface(Ci.nsIInterfaceRequestor)
  28. .getInterface(Ci.nsIDocShell)
  29. .sameTypeRootTreeItem
  30. .QueryInterface(Ci.nsIDocShell)
  31. .QueryInterface(Ci.nsIInterfaceRequestor)
  32. .getInterface(Ci.nsIContentFrameMessageManager);
  33. };
  34. /******************************************************************************/
  35. const contentObserver = {
  36. classDescription: 'content-policy for ' + hostName,
  37. classID: Components.ID('{c84283d4-9975-41b7-b1a4-f106af56b51d}'),
  38. contractID: '@' + hostName + '/content-policy;1',
  39. ACCEPT: Ci.nsIContentPolicy.ACCEPT,
  40. MAIN_FRAME: Ci.nsIContentPolicy.TYPE_DOCUMENT,
  41. contentBaseURI: 'chrome://' + hostName + '/content/js/',
  42. uniqueSandboxId: 1,
  43. get componentRegistrar() {
  44. return Components.manager.QueryInterface(Ci.nsIComponentRegistrar);
  45. },
  46. get categoryManager() {
  47. return Components.classes['@mozilla.org/categorymanager;1']
  48. .getService(Ci.nsICategoryManager);
  49. },
  50. QueryInterface: XPCOMUtils.generateQI([
  51. Ci.nsIFactory,
  52. Ci.nsIObserver,
  53. Ci.nsIContentPolicy,
  54. Ci.nsISupportsWeakReference
  55. ]),
  56. createInstance: function(outer, iid) {
  57. if ( outer ) {
  58. throw Components.results.NS_ERROR_NO_AGGREGATION;
  59. }
  60. return this.QueryInterface(iid);
  61. },
  62. register: function() {
  63. Services.obs.addObserver(this, 'document-element-inserted', true);
  64. this.componentRegistrar.registerFactory(
  65. this.classID,
  66. this.classDescription,
  67. this.contractID,
  68. this
  69. );
  70. this.categoryManager.addCategoryEntry(
  71. 'content-policy',
  72. this.contractID,
  73. this.contractID,
  74. false,
  75. true
  76. );
  77. },
  78. unregister: function() {
  79. Services.obs.removeObserver(this, 'document-element-inserted');
  80. this.componentRegistrar.unregisterFactory(this.classID, this);
  81. this.categoryManager.deleteCategoryEntry(
  82. 'content-policy',
  83. this.contractID,
  84. false
  85. );
  86. },
  87. // https://bugzil.la/612921
  88. shouldLoad: function(type, location, origin, context) {
  89. return this.ACCEPT;
  90. },
  91. initContentScripts: function(win, sandbox) {
  92. let messager = getMessageManager(win);
  93. let sandboxId = hostName + ':sb:' + this.uniqueSandboxId++;
  94. if ( sandbox ) {
  95. let sandboxName = [
  96. win.location.href.slice(0, 100),
  97. win.document.title.slice(0, 100)
  98. ].join(' | ');
  99. sandbox = Cu.Sandbox([win], {
  100. sandboxName: sandboxId + '[' + sandboxName + ']',
  101. sandboxPrototype: win,
  102. wantComponents: false,
  103. wantXHRConstructor: false
  104. });
  105. sandbox.injectScript = function(script) {
  106. Services.scriptloader.loadSubScript(script, sandbox);
  107. };
  108. }
  109. else {
  110. sandbox = win;
  111. }
  112. sandbox._sandboxId_ = sandboxId;
  113. sandbox.sendAsyncMessage = messager.sendAsyncMessage;
  114. sandbox.addMessageListener = function(callback) {
  115. if ( sandbox._messageListener_ ) {
  116. sandbox.removeMessageListener();
  117. }
  118. sandbox._messageListener_ = function(message) {
  119. callback(message.data);
  120. };
  121. messager.addMessageListener(
  122. sandbox._sandboxId_,
  123. sandbox._messageListener_
  124. );
  125. messager.addMessageListener(
  126. hostName + ':broadcast',
  127. sandbox._messageListener_
  128. );
  129. };
  130. sandbox.removeMessageListener = function() {
  131. try {
  132. messager.removeMessageListener(
  133. sandbox._sandboxId_,
  134. sandbox._messageListener_
  135. );
  136. messager.removeMessageListener(
  137. hostName + ':broadcast',
  138. sandbox._messageListener_
  139. );
  140. } catch (ex) {
  141. // It throws sometimes, mostly when the popup closes
  142. }
  143. sandbox._messageListener_ = null;
  144. };
  145. return sandbox;
  146. },
  147. observe: function(doc) {
  148. let win = doc.defaultView;
  149. if ( !win ) {
  150. return;
  151. }
  152. let loc = win.location;
  153. if ( !loc ) {
  154. return;
  155. }
  156. if ( loc.protocol !== 'http:' && loc.protocol !== 'https:' && loc.protocol !== 'file:' ) {
  157. if ( loc.protocol === 'chrome:' && loc.host === hostName ) {
  158. this.initContentScripts(win);
  159. }
  160. // What about data: and about:blank?
  161. return;
  162. }
  163. let lss = Services.scriptloader.loadSubScript;
  164. let sandbox = this.initContentScripts(win, true);
  165. lss(this.contentBaseURI + 'vapi-client.js', sandbox);
  166. lss(this.contentBaseURI + 'contentscript-start.js', sandbox);
  167. let docReady = (e) => {
  168. let doc = e.target;
  169. doc.removeEventListener(e.type, docReady, true);
  170. lss(this.contentBaseURI + 'contentscript-end.js', sandbox);
  171. };
  172. if ( doc.readyState === 'loading') {
  173. doc.addEventListener('DOMContentLoaded', docReady, true);
  174. } else {
  175. docReady({ target: doc, type: 'DOMContentLoaded' });
  176. }
  177. }
  178. };
  179. /******************************************************************************/
  180. contentObserver.register();
  181. /******************************************************************************/