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// Copyright (c) 2014 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.
'use strict';
/**
* @fileoverview This is the content script injected by the opt in helper.
* It is injected into the newtab page and also google.com and notifies the
* page to show an opt-in message for the user to enable the built-in hotword
* extension.
*/
/** @constructor */
var OptInClient = function() {};
/**
* Commands sent from this injected content scripts to the page.
* @enum {string}
*/
OptInClient.CommandToPage = {
// Allow hotword opt-in message bubble to be displayed.
ALLOW_OPTIN_MESSAGE: 'chwom'
};
/**
* Commands sent from the page to this content script.
* @enum {string}
*/
OptInClient.CommandFromPage = {
// User has explicitly clicked 'no'.
CLICKED_NO_OPTIN: 'hcno',
// User has opted in.
CLICKED_OPTIN: 'hco',
// Audio logging is opted in.
AUDIO_LOGGING_ON: 'alon',
// Audio logging is opted out.
AUDIO_LOGGING_OFF: 'aloff',
};
/**
* Used to determine if this content script has already been injected.
* @const {string}
* @private
*/
OptInClient.EXISTS_ = 'chwoihe';
/**
* Handles the messages posted to the window, mainly listening for
* the optin and no optin clicks. Also listening for preference on
* audio logging.
* @param {!MessageEvent} messageEvent Message event from the window.
* @private
*/
OptInClient.prototype.handleCommandFromPage_ = function(messageEvent) {
if (messageEvent.source === window && messageEvent.data.type) {
var command = messageEvent.data.type;
chrome.runtime.sendMessage({'type': command});
}
};
/**
* Sends a command to the page allowing it to display the hotword opt-in
* message. It is up to the page whether it is actually displayed.
* @private
*/
OptInClient.prototype.notifyPageAllowOptIn_ = function() {
if (document.readyState === 'complete') {
window.postMessage(
{'type': OptInClient.CommandToPage.ALLOW_OPTIN_MESSAGE}, '*');
}
};
/**
* Initializes the content script.
*/
OptInClient.prototype.initialize = function() {
if (OptInClient.EXISTS_ in window)
return;
window[OptInClient.EXISTS_] = true;
window.addEventListener(
'message', this.handleCommandFromPage_.bind(this), false);
if (document.readyState === 'complete')
this.notifyPageAllowOptIn_();
else
document.onreadystatechange = this.notifyPageAllowOptIn_;
};
new OptInClient().initialize();
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