Windows chromoting host installation via the NPAPI plugin

remoting/webapp/host_dispatcher.js

 // Copyright 2013 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
  * This class provides an interface between the HostController and either the
  * NativeMessaging Host or the Host NPAPI plugin, depending on whether or not
  * NativeMessaging is supported. Since the test for NativeMessaging support is
  * asynchronous, this class stores any requests on a queue, pending the result
@@ skipping 16 matching lines @@
  *     instantiate the NPAPI plugin when NativeMessaging is determined to be
  *     unsupported.
  */
 remoting.HostDispatcher = function(createPluginCallback) {
   /** @type {remoting.HostNativeMessaging} @private */
   this.nativeMessagingHost_ = new remoting.HostNativeMessaging();
 
   /** @type {remoting.HostPlugin} @private */
   this.npapiHost_ = null;
 
-  /** @type {remoting.HostDispatcher.State} */
+  /** @type {remoting.HostDispatcher.State} @private */
   this.state_ = remoting.HostDispatcher.State.UNKNOWN;
 
-  /** @type {Array.<function()>} */
+  /** @type {Array.<function()>} @private */
   this.pendingRequests_ = [];
 
+  /** @type {function():remoting.HostPlugin} @private */
   this.createPluginCallback_ = createPluginCallback;
 
   this.tryToInitialize_();
 }
 
 /** @enum {number} */
 remoting.HostDispatcher.State = {
   UNKNOWN: 0,
   NATIVE_MESSAGING: 1,
   NPAPI: 2,
@@ skipping 266 matching lines @@
         onError(remoting.Error.MISSING_PLUGIN);
       }
       break;
     case remoting.HostDispatcher.State.NOT_INSTALLED:
       onError(remoting.Error.MISSING_PLUGIN);
       break;
   }
 };
 
 /**
+ * @param {function(remoting.HostController.AsyncResult):void} onDone
+ * @param {function(remoting.Error):void} onError
+ * @return {void}
+ */
+remoting.HostDispatcher.prototype.installHost = function(onDone, onError) {
+  switch (this.state_) {
+    case remoting.HostDispatcher.State.UNKNOWN:
+      this.pendingRequests_.push(
+          this.startDaemon.bind(this, config, consent, onDone, onError));
+      break;
+    case remoting.HostDispatcher.State.NATIVE_MESSAGING:
+      // Host already installed, no action needed.
+      onDone(remoting.HostController.AsyncResult.OK);
+      break;
+    case remoting.HostDispatcher.State.NPAPI:
+      try {
+        this.npapiHost_.installHost(onDone);
+      } catch (err) {
+        onError(remoting.Error.MISSING_PLUGIN);
+      }
+      break;
+    case remoting.HostDispatcher.State.NOT_INSTALLED:
+      onError(remoting.Error.MISSING_PLUGIN);
+      break;
+  }
+};
+
+/**
  * @param {Object} config
  * @param {boolean} consent
  * @param {function(remoting.HostController.AsyncResult):void} onDone
  * @param {function(remoting.Error):void} onError
  * @return {void}
  */
 remoting.HostDispatcher.prototype.startDaemon =
     function(config, consent, onDone, onError) {
   switch (this.state_) {
     case remoting.HostDispatcher.State.UNKNOWN:
@@ skipping 266 matching lines @@
   }
 };
 
 /**
  * Returns true if the NPAPI plugin is being used.
  * @return {boolean}
  */
 remoting.HostDispatcher.prototype.usingNpapiPlugin = function() {
   return this.state_ == remoting.HostDispatcher.State.NPAPI;
 }