browser.php

Joomla15 - 最新开源CMS

<?php
/**
* @version		$Id: browser.php 8288 2007-08-01 08:40:54Z eddieajau $
* @package		Joomla.Framework
* @subpackage	Environment
* @copyright	Copyright (C) 2005 - 2007 Open Source Matters. All rights reserved.
* @license		GNU/GPL, see LICENSE.php
* Joomla! is free software. This version may have been modified pursuant
* to the GNU General Public License, and as distributed it includes or
* is derivative of works licensed under the GNU General Public License or
* other free or open source software licenses.
* See COPYRIGHT.php for copyright notices and details.
*/

// Check to ensure this file is within the rest of the framework
defined('JPATH_BASE') or die();

/**
 * Browser class, provides capability information about the current web client.
 *
 * Browser identification is performed by examining the HTTP_USER_AGENT
 * environment variable provided by the web server.
 *
 * This class has many influences from the lib/Browser.php code in
 * version 3 of Horde.
 *
 * @author  Chuck Hagenbuch <[e-mail]>
 * @author  Jon Parise <[e-mail]>
 * @author	Johan Janssens <[e-mail]>
 *
 * @package		Joomla.Framework
 * @subpackage	Environment
 * @since		1.5
 */

class JBrowser extends JObject
{
	/**
	 * Major version number.
	 *
	 * @var integer
	 */
	var $_majorVersion = 0;

	/**
	 * Minor version number.
	 *
	 * @var integer
	 */
	var $_minorVersion = 0;

	/**
	 * Browser name.
	 *
	 * @var string
	 */
	var $_browser = '';

	/**
	 * Full user agent string.
	 *
	 * @var string
	 */
	var $_agent = '';

	/**
	 * Lower-case user agent string.
	 *
	 * @var string
	 */
	var $_lowerAgent = '';

	/**
	 * HTTP_ACCEPT string
	 *
	 * @var string
	 */
	var $_accept = '';

	 /**
	 * Platform the browser is running on.
	 *
	 * @var string
	 */
	var $_platform = '';

	/**
	 * Known robots.
	 *
	 * @var array
	 */
	var $_robots = array(
		/* The most common ones. */
		'Googlebot',
		'msnbot',
		'Slurp',
		'Yahoo',
		/* The rest alphabetically. */
		'Arachnoidea',
		'ArchitextSpider',
		'Ask Jeeves',
		'B-l-i-t-z-Bot',
		'Baiduspider',
		'BecomeBot',
		'cfetch',
		'ConveraCrawler',
		'ExtractorPro',
		'FAST-WebCrawler',
		'FDSE robot',
		'fido',
		'geckobot',
		'Gigabot',
		'Girafabot',
		'grub-client',
		'Gulliver',
		'HTTrack',
		'ia_archiver',
		'InfoSeek',
		'kinjabot',
		'KIT-Fireball',
		'larbin',
		'LEIA',
		'lmspider',
		'Lycos_Spider',
		'Mediapartners-Google',
		'MuscatFerret',
		'NaverBot',
		'OmniExplorer_Bot',
		'polybot',
		'Pompos',
		'Scooter',
		'Teoma',
		'TheSuBot',
		'TurnitinBot',
		'Ultraseek',
		'ViolaBot',
		'webbandit',
		'www.almaden.ibm.com/cs/crawler',
		'ZyBorg',
	);

	/**
	 * Is this a mobile browser?
	 *
	 * @var boolean
	 */
	var $_mobile = false;

	/**
	 * Features.
	 *
	 * @var array
	 */
	var $_features = array(
		'html'			=> true,
		'hdml'			=> false,
		'wml'			=> false,
		'images'	 	=> true,
		'iframes'		=> false,
		'frames'	 	=> true,
		'tables'	 	=> true,
		'java'			=> true,
		'javascript'	=> true,
		'dom'			=> false,
		'utf'			=> false,
		'rte'			=> false,
		'homepage'		=> false,
		'accesskey'		=> false,
		'optgroup'		=> false,
		'xmlhttpreq'	=> false,
		'cite'			=> false,
	);

	/**
	 * Quirks
	 *
	 * @var array
	 */
	var $_quirks = array(
		'avoid_popup_windows'			=> false,
		'break_disposition_header'		=> false,
		'break_disposition_filename'	=> false,
		'broken_multipart_form'			=> false,
		'cache_same_url'				=> false,
		'cache_ssl_downloads'			=> false,
		'double_linebreak_textarea'		=> false,
		'empty_file_input_value'		=> false,
		'must_cache_forms'				=> false,
		'no_filename_spaces'			=> false,
		'no_hidden_overflow_tables'		=> false,
		'ow_gui_1.3'					=> false,
		'png_transparency'				=> false,
		'scrollbar_in_way'				=> false,
		'scroll_tds'					=> false,
		'windowed_controls'				=> false,
	);

	/**
	 * List of viewable image MIME subtypes.
	 * This list of viewable images works for IE and Netscape/Mozilla.
	 *
	 * @var array
	 */
	var $_images = array('jpeg', 'gif', 'png', 'pjpeg', 'x-png', 'bmp');


	/**
	 * Create a browser instance (Constructor).
	 *
	 * @param string $userAgent  The browser string to parse.
	 * @param string $accept	 The HTTP_ACCEPT settings to use.
	 */
	function __construct($userAgent = null, $accept = null)
	{
		$this->match($userAgent, $accept);
	}

	/**
	 * Returns a reference to the global Browser object, only creating it
	 * if it doesn't already exist.
	 *
	 * This method must be invoked as:
	 * 		<pre>  $browser = &JBrowser::getInstance([$userAgent[, $accept]]);</pre>
	 *
	 * @access public
	 * @param string $userAgent  The browser string to parse.
	 * @param string $accept	 The HTTP_ACCEPT settings to use.
	 * @return JBrowser  The Browser object.
	 */
	function &getInstance($userAgent = null, $accept = null)
	{
		static $instances;

		if (!isset($instances)) {
			$instances = array();
		}

		$signature = serialize(array($userAgent, $accept));

		if (empty($instances[$signature])) {
			$instances[$signature] = new JBrowser($userAgent, $accept);
		}

		return $instances[$signature];
	}

	/**
	 * Parses the user agent string and inititializes the object with
	 * all the known features and quirks for the given browser.
	 *
	 * @param string $userAgent  The browser string to parse.
	 * @param string $accept	 The HTTP_ACCEPT settings to use.
	 */
	function match($userAgent = null, $accept = null)
	{
		// Set our agent string.
		if (is_null($userAgent)) {
			if (isset($_SERVER['HTTP_USER_AGENT'])) {
				$this->_agent = trim($_SERVER['HTTP_USER_AGENT']);
			}
		} else {
			$this->_agent = $userAgent;
		}
		$this->_lowerAgent = strtolower($this->_agent);

		// Set our accept string.
		if (is_null($accept)) {
			if (isset($_SERVER['HTTP_ACCEPT'])) {
				$this->_accept = strtolower(trim($_SERVER['HTTP_ACCEPT']));
			}
		} else {
			$this->_accept = strtolower($accept);
		}

		// Check for UTF support.
		if (isset($_SERVER['HTTP_ACCEPT_CHARSET'])) {
			$this->setFeature('utf', strpos(strtolower($_SERVER['HTTP_ACCEPT_CHARSET']), 'utf') !== false);
		}

		if (!empty($this->_agent)) {
			$this->_setPlatform();

			if (strpos($this->_lowerAgent, 'mobileexplorer') !== false ||
				strpos($this->_lowerAgent, 'openwave') !== false ||
				strpos($this->_lowerAgent, 'opera mini') !== false ||
				strpos($this->_lowerAgent, 'operamini') !== false) {
				$this->setFeature('frames', false);
				$this->setFeature('javascript', false);
				$this->setQuirk('avoid_popup_windows');
				$this->_mobile = true;
			} elseif (preg_match('|Opera[/ ]([0-9.]+)|', $this->_agent, $version)) {
						$this->setBrowser('opera');
						list($this->_majorVersion, $this->_minorVersion) = explode('.', $version[1]);
						$this->setFeature('javascript', true);
						$this->setQuirk('no_filename_spaces');

				if ($this->_majorVersion >= 7) {
					$this->setFeature('dom');
					$this->setFeature('iframes');
					$this->setFeature('accesskey');
					$this->setFeature('optgroup');
					$this->setQuirk('double_linebreak_textarea');
				}
			} elseif (strpos($this->_lowerAgent, 'elaine/') !== false ||
						strpos($this->_lowerAgent, 'palmsource') !== false ||
						strpos($this->_lowerAgent, 'digital paths') !== false) {
				$this->setBrowser('palm');
				$this->setFeature('images', false);
				$this->setFeature('frames', false);
				$this->setFeature('javascript', false);
				$this->setQuirk('avoid_popup_windows');
				$this->_mobile = true;
			} elseif ((preg_match('|MSIE ([0-9.]+)|', $this->_agent, $version)) ||
						(preg_match('|Internet Explorer/([0-9.]+)|', $this->_agent, $version))) {

				$this->setBrowser('msie');
				$this->setQuirk('cache_ssl_downloads');
				$this->setQuirk('cache_same_url');
				$this->setQuirk('break_disposition_filename');

				if (strpos($version[1], '.') !== false) {
					list($this->_majorVersion, $this->_minorVersion) = explode('.', $version[1]);
				} else {
					$this->_majorVersion = $version[1];
					$this->_minorVersion = 0;
				}

				/* IE (< 7) on Windows does not support alpha transparency in
				 * PNG images. */
				if (($this->_majorVersion < 7) &&
					preg_match('/windows/i', $this->_agent)) {
					$this->setQuirk('png_transparency');
				}

				/* Some Handhelds have their screen resolution in the
				 * user agent string, which we can use to look for
				 * mobile agents. */
				if (preg_match('/; (120x160|240x280|240x320|320x320)\)/', $this->_agent)) {
					$this->_mobile = true;
				}

				switch ($this->_majorVersion) {
				case 7:
					$this->setFeature('javascript', 1.4);
					$this->setFeature('dom');
					$this->setFeature('iframes');
					$this->setFeature('utf');
					$this->setFeature('rte');
					$this->setFeature('homepage');
					$this->setFeature('accesskey');
					$this->setFeature('optgroup');
					$this->setFeature('xmlhttpreq');
					$this->setQuirk('scrollbar_in_way');
					break;

				case 6:
					$this->setFeature('javascript', 1.4);
					$this->setFeature('dom');
					$this->setFeature('iframes');
					$this->setFeature('utf');
					$this->setFeature('rte');
					$this->setFeature('homepage');
					$this->setFeature('accesskey');
					$this->setFeature('optgroup');
					$this->setFeature('xmlhttpreq');
					$this->setQuirk('scrollbar_in_way');
					$this->setQuirk('broken_multipart_form');
					$this->setQuirk('windowed_controls');
					break;

				case 5:
					if ($this->getPlatform() == 'mac') {
						$this->setFeature('javascript', 1.2);
						$this->setFeature('optgroup');
					} else {
						// MSIE 5 for Windows.
						$this->setFeature('javascript', 1.4);
						$this->setFeature('dom');
						$this->setFeature('xmlhttpreq');
						if ($this->_minorVersion >= 5) {
							$this->setFeature('rte');
							$this->setQuirk('windowed_controls');
						}
					}
					$this->setFeature('iframes');
					$this->setFeature('utf');
					$this->setFeature('homepage');
					$this->setFeature('accesskey');
					if ($this->_minorVersion == 5) {
						$this->setQuirk('break_disposition_header');
						$this->setQuirk('broken_multipart_form');
					}
					break;

				case 4:
					$this->setFeature('javascript', 1.2);
					$this->setFeature('accesskey');
					if ($this->_minorVersion > 0) {
						$this->setFeature('utf');
					}
					break;

				case 3:
					$this->setFeature('javascript', 1.5);
					$this->setQuirk('avoid_popup_windows');
					break;
				}
			} elseif (preg_match('|ANTFresco/([0-9]+)|', $this->_agent, $version)) {
				$this->setBrowser('fresco');