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/*
* Copyright (c) 2011 The Native Client 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 file provides a BrowserChecker Javascript class.
* Users can create a BrowserChecker object, invoke checkBrowser(|version|),
* and then use getIsValidBrowser() and getBrowserSupportStatus()
* to determine if the browser version is greater than |version|
* and if the Native Client plugin is found.
*/
// Create a namespace object
var browser_version = browser_version || {};
/**
* Class to provide checking for version and NativeClient.
* @param {integer} arg1 An argument that indicates major version of Chrome we
* require, such as 14.
*/
/**
* Constructor for the BrowserChecker. Sets the major version of
* Chrome that is required to |minChromeVersion|.
* @param minChromeVersion The earliest major version of chrome that
* is supported. If the Chrome browser version is less than
* |minChromeVersion| then |isValidBrowswer| will be set to false.
* @param opt_maxChromeVersion Ignored. Retained for backwards compatibility.
* @param appVersion The application version string.
* @param plugins The plugins that exist in the browser.
* @constructor
*/
browser_version.BrowserChecker = function(minChromeVersion,
appVersion, plugins,
opt_maxChromeVersion) {
/**
* Version specified by the user. This class looks to see if the browser
* version is >= |minChromeVersion_|.
* @type {integer}
* @private
*/
this.minChromeVersion_ = minChromeVersion;
/**
* List of Browser plugin objects.
* @type {Ojbect array}
* @private
*/
this.plugins_ = plugins;
/**
* Application version string from the Browser.
* @type {integer}
* @private
*/
this.appVersion_ = appVersion;
/**
* Flag used to indicate if the browser has Native Client and is if the
* browser version is recent enough.
* @type {boolean}
* @private
*/
this.isValidBrowser_ = false;
/**
* Actual major version of Chrome -- found by querying the browser.
* @type {integer}
* @private
*/
this.chromeVersion_ = null;
/**
* Browser support status. This allows the user to get a detailed status
* rather than using this.browserSupportMessage.
*/
this.browserSupportStatus_ =
browser_version.BrowserChecker.StatusValues.UNKNOWN;
}
/**
* The values used for BrowserChecker status to indicate success or
* a specific error.
* @enum {id}
*/
browser_version.BrowserChecker.StatusValues = {
UNKNOWN: 0,
NACL_ENABLED: 1,
UNKNOWN_BROWSER: 2,
CHROME_VERSION_TOO_OLD: 3,
NACL_NOT_ENABLED: 4,
NOT_USING_SERVER: 5
};
/**
* Determines if the plugin with name |name| exists in the browser.
* @param {string} name The name of the plugin.
* @param {Object array} plugins The plugins in this browser.
* @return {bool} |true| if the plugin is found.
*/
browser_version.BrowserChecker.prototype.pluginExists = function(name,
plugins) {
for (var index=0; index < plugins.length; index++) {
var plugin = this.plugins_[index];
var plugin_name = plugin['name'];
// If the plugin is not found, you can use the Javascript console
// to see the names of the plugins that were found when debugging.
if (plugin_name.indexOf(name) != -1) {
return true;
}
}
return false;
}
/**
* Returns browserSupportStatus_ which indicates if the browser supports
* Native Client. Values are defined as literals in
* browser_version.BrowserChecker.StatusValues.
* @ return {int} Level of NaCl support.
*/
browser_version.BrowserChecker.prototype.getBrowserSupportStatus = function() {
return this.browserSupportStatus_;
}
/**
* Returns isValidBrowser (true/false) to indicate if the browser supports
* Native Client.
* @ return {bool} If this browser has NativeClient and correct version.
*/
browser_version.BrowserChecker.prototype.getIsValidBrowser = function() {
return this.isValidBrowser_;
}
/**
* Checks to see if this browser can support Native Client applications.
* For Chrome browsers, checks to see if the "Native Client" plugin is
* enabled.
*/
browser_version.BrowserChecker.prototype.checkBrowser = function() {
var versionPatt = /Chrome\/(\d+)\.(\d+)\.(\d+)\.(\d+)/;
var result = this.appVersion_.match(versionPatt);
// |result| stores the Chrome version number.
if (!result) {
this.isValidBrowser_ = false;
this.browserSupportStatus_ =
browser_version.BrowserChecker.StatusValues.UNKNOWN_BROWSER;
} else {
this.chromeVersion_ = result[1];
// We know we have Chrome, check version and/or plugin named Native Client
if (this.chromeVersion_ >= this.minChromeVersion_) {
var found_nacl = this.pluginExists('Native Client', this.plugins_);
if (found_nacl) {
this.isValidBrowser_ = true;
this.browserSupportStatus_ =
browser_version.BrowserChecker.StatusValues.NACL_ENABLED;
} else {
this.isValidBrowser_ = false;
this.browserSupportStatus_ =
browser_version.BrowserChecker.StatusValues.NACL_NOT_ENABLED;
}
} else {
// We are in a version that is less than |minChromeVersion_|
this.isValidBrowser_ = false;
this.browserSupportStatus_ =
browser_version.BrowserChecker.StatusValues.CHROME_VERSION_TOO_OLD;
}
}
var my_protocol = window.location.protocol;
if (my_protocol.indexOf('file') == 0) {
this.isValidBrowser_ = false;
this.browserSupportStatus_ =
browser_version.BrowserChecker.StatusValues.NOT_USING_SERVER;
}
}
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