theme.php

讲的是网络编程

<?php
/**
* xos_opal_Theme component class file
*
* @copyright	The Xoops project http://www.xoops.org/
* @license      http://www.fsf.org/copyleft/gpl.html GNU public license
* @author       Skalpa Keo <[e-mail]>
* @since        2.3.0
* @version		$Id: theme.php 1100 2007-10-19 01:36:05Z dugris $
* @package 		xos_opal
* @subpackage 	xos_opal_Theme
*/

/**
* xos_opal_ThemeFactory
*
* @author 		Skalpa Keo
* @package		xos_opal
* @subpackage	xos_opal_Theme
* @since        2.3.0
*/
class xos_opal_ThemeFactory {

	var $xoBundleIdentifier = 'xos_opal_ThemeFactory';
	/**
	 * Currently enabled themes (if empty, all the themes in themes/ are allowed)
	 * @var array
	 */
	var $allowedThemes = array();
	/**
	 * Default theme to instanciate if none specified
	 * @var string
	 */
	var $defaultTheme = 'default';
	/**
	 * If users are allowed to choose a custom theme
	 * @var bool
	 */
	var $allowUserSelection = true;

	/**
	 * Instanciate the specified theme
	 */
	function &createInstance( $options = array(), $initArgs = array() ) {
		// Grab the theme folder from request vars if present
		if ( @empty( $options['folderName'] ) ) {
			if ( ( $req = @$_REQUEST['xoops_theme_select'] ) && $this->isThemeAllowed( $req ) ) {
				$options['folderName'] = $req;
				if ( isset( $_SESSION ) && $this->allowUserSelection ) {
					$_SESSION[ $this->xoBundleIdentifier ]['defaultTheme'] = $req;
	    		}
			} elseif ( isset( $_SESSION[ $this->xoBundleIdentifier ]['defaultTheme'] ) ) {
				$options['folderName'] = $_SESSION[ $this->xoBundleIdentifier ]['defaultTheme'];
			} elseif ( @empty( $options['folderName'] ) || !$this->isThemeAllowed( $options['folderName'] ) ) {
				$options['folderName'] = $this->defaultTheme;
			}
			$GLOBALS['xoopsConfig']['theme_set'] = $options['folderName'];
		}
		$options['path'] = XOOPS_THEME_PATH . '/' . $options['folderName'];
		$inst =& new xos_opal_Theme();
		foreach ( $options as $k => $v ) $inst->$k = $v;
		$inst->xoInit();
		return $inst;
	}

	/**
	 * Checks if the specified theme is enabled or not
	 * @param string $name
	 * @return bool
	 */
	function isThemeAllowed( $name ) {
		return ( empty( $this->allowedThemes ) || in_array( $name, $this->allowedThemes ) );
	}

}

class xos_opal_Theme {
   /**
    * The name of this theme
    * @var string
    */
	var $folderName = '';
   /**
    * Physical path of this theme folder
    * @var string
    */
	var $path = '';
	var $url = '';

   /**
    * Whether or not the theme engine should include the output generated by php
    * @var string
    */
	var $bufferOutput = true;
	/**
	* Canvas-level template to use
	* @var string
	*/
	var $canvasTemplate = 'theme.html';
	/**
	* Content-level template to use
	* @var string
	*/
	var $contentTemplate = '';

	var $contentCacheLifetime = 0;
	var $contentCacheId = null;

	/**
	* Text content to display right after the contentTemplate output
	* @var string
	*/
	var $content = '';
	/**
	* Page construction plug-ins to use
	* @var array
	* @access public
	*/
	var $plugins = array( 'xos_logos_PageBuilder' );

	var $renderCount = 0;
	/**
	 * Pointer to the theme template engine
	 * @var XoopsTpl
	 */
	var $template = false;

	/**
	 * Array containing the document meta-information
	 * @var array
	 */
	var $metas = array(
		'http' => array(
			'Content-Script-Type' => 'text/javascript',
			'Content-Style-Type' => 'text/css',
		),
		'meta' => array(),
		'link' => array(),
		'script' => array(),
	);

	/**
	 * Array of strings to be inserted in the head tag of HTML documents
	 * @var array
	 */
	var $htmlHeadStrings = array();
	/**
	 * Custom variables that will always be assigned to the template
	 * @var array
	 */
	var $templateVars = array();

    /**
     * User extra information for cache id, like language, user groups
     *
     * @var boolean
     */
	var $use_extra_cache_id = true;

   /**#@-*/

	/**#@+ @tasktype 10 Initialization*/
	/**
	 * Initializes this theme
	 *
	 * Upon initialization, the theme creates its template engine and instanciates the
	 * plug-ins from the specified {@link $plugins} list. If the theme is a 2.0 theme, that does not
	 * display redirection messages, the HTTP redirections system is disabled to ensure users will
	 * see the redirection screen.
	 *
	 * @param array $options
	 * @return bool
	 */
   function xoInit( $options = array() ) {
		global $xoops;

		$this->path = XOOPS_THEME_PATH . '/' . $this->folderName;
		$this->url = XOOPS_THEME_URL . '/' . $this->folderName;

		$this->template =& new XoopsTpl();
		$this->template->currentTheme =& $this;
		$this->template->assign_by_ref( 'xoTheme', $this );

		global $xoopsConfig, $xoopsModule, $xoopsUser;
		$this->template->assign( array(
	    	'xoops_theme' => $xoopsConfig['theme_set'],
	    	'xoops_imageurl' => XOOPS_THEME_URL.'/'.$xoopsConfig['theme_set'].'/',
	    	'xoops_themecss'=> xoops_getcss($xoopsConfig['theme_set']),
	    	'xoops_requesturi' => htmlspecialchars( $_SERVER['REQUEST_URI'], ENT_QUOTES),
	    	'xoops_sitename' => htmlspecialchars($xoopsConfig['sitename'], ENT_QUOTES),
	    	'xoops_slogan' => htmlspecialchars($xoopsConfig['slogan'], ENT_QUOTES),
	    	'xoops_dirname' => @$xoopsModule ? $xoopsModule->getVar( 'dirname' ) : 'system',
	    	'xoops_banner' => $xoopsConfig['banners'] ? xoops_getbanner() : '&nbsp;',
	    	'xoops_pagetitle' => isset($xoopsModule) && is_object($xoopsModule) ? $xoopsModule->getVar('name') : htmlspecialchars( $xoopsConfig['slogan'], ENT_QUOTES ),
	    ) );
	    if ( isset($xoopsUser) && is_object($xoopsUser) ) {
	        $this->template->assign( array(
	        	'xoops_isuser' => true,
	        	'xoops_userid' => $xoopsUser->getVar('uid'),
	        	'xoops_uname' => $xoopsUser->getVar('uname'),
	        	'xoops_isadmin' => $GLOBALS['xoopsUserIsAdmin'],
	        ) );
	    } else {
	        $this->template->assign( array( 'xoops_isuser' => false, 'xoops_isadmin' => false ) );
	    }
		// Meta tags
	    $config_handler =& xoops_gethandler('config');
	    $criteria = new CriteriaCompo(new Criteria('conf_modid', 0));
	    $criteria->add(new Criteria('conf_catid', XOOPS_CONF_METAFOOTER));
	    $config = $config_handler->getConfigs($criteria, true);
	    foreach ( array_keys($config) as $i ) {
	    	$name = $config[$i]->getVar( 'conf_name', 'n' );
	    	$value = $config[$i]->getVar( 'conf_value', 'n' );
	    	if ( substr( $name, 0, 5 ) == 'meta_' ) {
	    		$this->addMeta( 'meta', substr( $name, 5 ), $value );
	    	} else {
	        	// prefix each tag with 'xoops_'
	        	$this->template->assign( "xoops_$name", $value );
	    	}
	    }

		if ( $this->bufferOutput ) {
			ob_start();
		}
		$GLOBALS['xoTheme'] =& $this;
		$GLOBALS['xoopsTpl'] =& $this->template;
		// Instanciate and initialize all the theme plugins
		foreach ( $this->plugins as $k => $bundleId ) {
			if ( !is_object( $bundleId ) ) {
				$this->plugins[$bundleId] =& new $bundleId();
				$this->plugins[$bundleId]->theme =& $this;
				$this->plugins[$bundleId]->xoInit();
				unset( $this->plugins[$k] );
			}
		}
		return true;
	}
	/**#@-*/

	/**
	 * Generate cache id based on extra information of language and user groups
	 *
	 * User groups other than anonymous should be detected to avoid disclosing group sensitive contents
	 *
	 * @param string	$cache_id		raw cache id
	 * @param string	$extraString	extra string
	 *
	 * @return string	complete cache id
	 */
	function generateCacheId($cache_id, $extraString = '') {
		static $extra_string;

		if (!$this->use_extra_cache_id) {
			return $cache_id;
		}

		if (empty($extraString)) {
			if (empty($extra_string)) {
				global $xoopsUser, $xoopsConfig;

				// Generate language section
				$extra_string = $xoopsConfig['language'];

				// Generate group section
				if ( !@is_object( $xoopsUser ) ) {
					$extra_string .= '|' . XOOPS_GROUP_ANONYMOUS;
				} else {
					$groups = $xoopsUser->getGroups();
					sort($groups);
					// Generate group string for non-anonymous groups,
					// XOOPS_DB_PASS and XOOPS_DB_NAME (before we find better variables) are used to protect group sensitive contents
					$extra_string .= '|' . implode(",", $groups).substr( md5(XOOPS_DB_PASS.XOOPS_DB_NAME), 0, strlen(XOOPS_DB_USER) * 2 );
				}
			}
			$extraString = $extra_string;
		}
		$cache_id .= '|' . $extraString;

		return $cache_id;
	}

	function checkCache() {