michael@0: /* Copyright 2012 Mozilla Foundation
michael@0:  *
michael@0:  * Licensed under the Apache License, Version 2.0 (the "License");
michael@0:  * you may not use this file except in compliance with the License.
michael@0:  * You may obtain a copy of the License at
michael@0:  *
michael@0:  *     http://www.apache.org/licenses/LICENSE-2.0
michael@0:  *
michael@0:  * Unless required by applicable law or agreed to in writing, software
michael@0:  * distributed under the License is distributed on an "AS IS" BASIS,
michael@0:  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
michael@0:  * See the License for the specific language governing permissions and
michael@0:  * limitations under the License.
michael@0:  */
michael@0: 
michael@0: var EXPORTED_SYMBOLS = ["ShumwayUtils"];
michael@0: 
michael@0: const RESOURCE_NAME = 'shumway';
michael@0: const EXT_PREFIX = 'shumway@research.mozilla.org';
michael@0: const SWF_CONTENT_TYPE = 'application/x-shockwave-flash';
michael@0: const PREF_PREFIX = 'shumway.';
michael@0: const PREF_DISABLED = PREF_PREFIX + 'disabled';
michael@0: const PREF_IGNORE_CTP = PREF_PREFIX + 'ignoreCTP';
michael@0: 
michael@0: let Cc = Components.classes;
michael@0: let Ci = Components.interfaces;
michael@0: let Cm = Components.manager;
michael@0: let Cu = Components.utils;
michael@0: 
michael@0: Cu.import('resource://gre/modules/XPCOMUtils.jsm');
michael@0: Cu.import('resource://gre/modules/Services.jsm');
michael@0: Cu.import('resource://shumway/ShumwayStreamConverter.jsm');
michael@0: 
michael@0: let Svc = {};
michael@0: XPCOMUtils.defineLazyServiceGetter(Svc, 'mime',
michael@0:                                    '@mozilla.org/mime;1',
michael@0:                                    'nsIMIMEService');
michael@0: XPCOMUtils.defineLazyServiceGetter(Svc, 'pluginHost',
michael@0:                                    '@mozilla.org/plugin/host;1',
michael@0:                                    'nsIPluginHost');
michael@0: 
michael@0: function getBoolPref(pref, def) {
michael@0:   try {
michael@0:     return Services.prefs.getBoolPref(pref);
michael@0:   } catch (ex) {
michael@0:     return def;
michael@0:   }
michael@0: }
michael@0: 
michael@0: function log(str) {
michael@0:   dump(str + '\n');
michael@0: }
michael@0: 
michael@0: // Register/unregister a constructor as a factory.
michael@0: function Factory() {}
michael@0: Factory.prototype = {
michael@0:   register: function register(targetConstructor) {
michael@0:     var proto = targetConstructor.prototype;
michael@0:     this._classID = proto.classID;
michael@0: 
michael@0:     var factory = XPCOMUtils._getFactory(targetConstructor);
michael@0:     this._factory = factory;
michael@0: 
michael@0:     var registrar = Cm.QueryInterface(Ci.nsIComponentRegistrar);
michael@0:     registrar.registerFactory(proto.classID, proto.classDescription,
michael@0:                               proto.contractID, factory);
michael@0:   },
michael@0: 
michael@0:   unregister: function unregister() {
michael@0:     var registrar = Cm.QueryInterface(Ci.nsIComponentRegistrar);
michael@0:     registrar.unregisterFactory(this._classID, this._factory);
michael@0:     this._factory = null;
michael@0:   }
michael@0: };
michael@0: 
michael@0: let converterFactory = new Factory();
michael@0: let overlayConverterFactory = new Factory();
michael@0: 
michael@0: let ShumwayUtils = {
michael@0:   QueryInterface: XPCOMUtils.generateQI([Ci.nsIObserver]),
michael@0:   _registered: false,
michael@0: 
michael@0:   init: function init() {
michael@0:     if (this.enabled)
michael@0:       this._ensureRegistered();
michael@0:     else
michael@0:       this._ensureUnregistered();
michael@0: 
michael@0:     // Listen for when shumway is completely disabled.
michael@0:     Services.prefs.addObserver(PREF_DISABLED, this, false);
michael@0:   },
michael@0: 
michael@0:   // nsIObserver
michael@0:   observe: function observe(aSubject, aTopic, aData) {
michael@0:     if (this.enabled)
michael@0:       this._ensureRegistered();
michael@0:     else
michael@0:       this._ensureUnregistered();
michael@0:   },
michael@0:   
michael@0:   /**
michael@0:    * shumway is only enabled if the global switch enabling is true.
michael@0:    * @return {boolean} Wether or not it's enabled.
michael@0:    */
michael@0:   get enabled() {
michael@0:     return !getBoolPref(PREF_DISABLED, true);
michael@0:   },
michael@0: 
michael@0:   _ensureRegistered: function _ensureRegistered() {
michael@0:     if (this._registered)
michael@0:       return;
michael@0: 
michael@0:     // Load the component and register it.
michael@0:     converterFactory.register(ShumwayStreamConverter);
michael@0:     overlayConverterFactory.register(ShumwayStreamOverlayConverter);
michael@0: 
michael@0:     var ignoreCTP = getBoolPref(PREF_IGNORE_CTP, true);
michael@0: 
michael@0:     Svc.pluginHost.registerPlayPreviewMimeType(SWF_CONTENT_TYPE, ignoreCTP);
michael@0: 
michael@0:     this._registered = true;
michael@0: 
michael@0:     log('Shumway is registered');
michael@0:   },
michael@0: 
michael@0:   _ensureUnregistered: function _ensureUnregistered() {
michael@0:     if (!this._registered)
michael@0:       return;
michael@0: 
michael@0:     // Remove the contract/component.
michael@0:     converterFactory.unregister();
michael@0:     overlayConverterFactory.unregister();
michael@0: 
michael@0:     Svc.pluginHost.unregisterPlayPreviewMimeType(SWF_CONTENT_TYPE);
michael@0: 
michael@0:     this._registered = false;
michael@0: 
michael@0:     log('Shumway is unregistered');
michael@0:   }
michael@0: };