config.php

很棒的在线教学系统

<?php

require_once 'HTMLPurifier/ConfigSchema.php';

// member variables
require_once 'HTMLPurifier/HTMLDefinition.php';
require_once 'HTMLPurifier/CSSDefinition.php';
require_once 'HTMLPurifier/URIDefinition.php';
require_once 'HTMLPurifier/Doctype.php';
require_once 'HTMLPurifier/DefinitionCacheFactory.php';

// accomodations for versions earlier than 4.3.10 and 5.0.2
// borrowed from PHP_Compat, LGPL licensed, by Aidan Lister <[e-mail]>
if (!defined('PHP_EOL')) {
    switch (strtoupper(substr(PHP_OS, 0, 3))) {
        case 'WIN':
            define('PHP_EOL', "\r\n");
            break;
        case 'DAR':
            define('PHP_EOL', "\r");
            break;
        default:
            define('PHP_EOL', "\n");
    }
}

/**
 * Configuration object that triggers customizable behavior.
 *
 * @warning This class is strongly defined: that means that the class
 *          will fail if an undefined directive is retrieved or set.
 * 
 * @note Many classes that could (although many times don't) use the
 *       configuration object make it a mandatory parameter.  This is
 *       because a configuration object should always be forwarded,
 *       otherwise, you run the risk of missing a parameter and then
 *       being stumped when a configuration directive doesn't work.
 */
class HTMLPurifier_Config
{
    
    /**
     * HTML Purifier's version
     */
    var $version = '2.1.5';
    
    /**
     * Two-level associative array of configuration directives
     */
    var $conf;
    
    /**
     * Reference HTMLPurifier_ConfigSchema for value checking
     */
    var $def;
    
    /**
     * Indexed array of definitions
     */
    var $definitions;
    
    /**
     * Bool indicator whether or not config is finalized
     */
    var $finalized = false;
    
    /**
     * Bool indicator whether or not to automatically finalize 
     * the object if a read operation is done
     */
    var $autoFinalize = true;
    
    /**
     * Namespace indexed array of serials for specific namespaces (see
     * getSerial for more info).
     */
    var $serials = array();
    
    /**
     * Serial for entire configuration object
     */
    var $serial;
    
    /**
     * @param $definition HTMLPurifier_ConfigSchema that defines what directives
     *                    are allowed.
     */
    function HTMLPurifier_Config(&$definition) {
        $this->conf = $definition->defaults; // set up, copy in defaults
        $this->def  = $definition; // keep a copy around for checking
    }
    
    /**
     * Convenience constructor that creates a config object based on a mixed var
     * @static
     * @param mixed $config Variable that defines the state of the config
     *                      object. Can be: a HTMLPurifier_Config() object,
     *                      an array of directives based on loadArray(),
     *                      or a string filename of an ini file.
     * @return Configured HTMLPurifier_Config object
     */
    function create($config) {
        if (is_a($config, 'HTMLPurifier_Config')) {
            // pass-through
            return $config;
        }
        $ret = HTMLPurifier_Config::createDefault();
        if (is_string($config)) $ret->loadIni($config);
        elseif (is_array($config)) $ret->loadArray($config);
        return $ret;
    }
    
    /**
     * Convenience constructor that creates a default configuration object.
     * @static
     * @return Default HTMLPurifier_Config object.
     */
    function createDefault() {
        $definition =& HTMLPurifier_ConfigSchema::instance();
        $config = new HTMLPurifier_Config($definition);
        return $config;
    }
    
    /**
     * Retreives a value from the configuration.
     * @param $namespace String namespace
     * @param $key String key
     */
    function get($namespace, $key, $from_alias = false) {
        if (!$this->finalized && $this->autoFinalize) $this->finalize();
        if (!isset($this->def->info[$namespace][$key])) {
            // can't add % due to SimpleTest bug
            trigger_error('Cannot retrieve value of undefined directive ' . htmlspecialchars("$namespace.$key"),
                E_USER_WARNING);
            return;
        }
        if ($this->def->info[$namespace][$key]->class == 'alias') {
            $d = $this->def->info[$namespace][$key];
            trigger_error('Cannot get value from aliased directive, use real name ' . $d->namespace . '.' . $d->name,
                E_USER_ERROR);
            return;
        }
        return $this->conf[$namespace][$key];
    }
    
    /**
     * Retreives an array of directives to values from a given namespace
     * @param $namespace String namespace
     */
    function getBatch($namespace) {
        if (!$this->finalized && $this->autoFinalize) $this->finalize();
        if (!isset($this->def->info[$namespace])) {
            trigger_error('Cannot retrieve undefined namespace ' . htmlspecialchars($namespace),
                E_USER_WARNING);
            return;
        }
        return $this->conf[$namespace];
    }
    
    /**
     * Returns a md5 signature of a segment of the configuration object
     * that uniquely identifies that particular configuration
     * @note Revision is handled specially and is removed from the batch
     *       before processing!
     * @param $namespace Namespace to get serial for
     */
    function getBatchSerial($namespace) {
        if (empty($this->serials[$namespace])) {
            $batch = $this->getBatch($namespace);
            unset($batch['DefinitionRev']);
            $this->serials[$namespace] = md5(serialize($batch));
        }
        return $this->serials[$namespace];
    }
    
    /**
     * Returns a md5 signature for the entire configuration object
     * that uniquely identifies that particular configuration
     */
    function getSerial() {
        if (empty($this->serial)) {
            $this->serial = md5(serialize($this->getAll()));
        }
        return $this->serial;
    }
    
    /**
     * Retrieves all directives, organized by namespace
     */
    function getAll() {
        if (!$this->finalized && $this->autoFinalize) $this->finalize();
        return $this->conf;
    }
    
    /**
     * Sets a value to configuration.
     * @param $namespace String namespace
     * @param $key String key
     * @param $value Mixed value
     */
    function set($namespace, $key, $value, $from_alias = false) {
        if ($this->isFinalized('Cannot set directive after finalization')) return;
        if (!isset($this->def->info[$namespace][$key])) {
            trigger_error('Cannot set undefined directive ' . htmlspecialchars("$namespace.$key") . ' to value',
                E_USER_WARNING);
            return;
        }
        if ($this->def->info[$namespace][$key]->class == 'alias') {
            if ($from_alias) {
                trigger_error('Double-aliases not allowed, please fix '.
                    'ConfigSchema bug with' . "$namespace.$key");
            }
            $this->set($this->def->info[$namespace][$key]->namespace,
                       $this->def->info[$namespace][$key]->name,
                       $value, true);
            return;
        }
        $value = $this->def->validate(
                    $value,
                    $type = $this->def->info[$namespace][$key]->type,
                    $this->def->info[$namespace][$key]->allow_null
                 );
        if (is_string($value)) {
            // resolve value alias if defined
            if (isset($this->def->info[$namespace][$key]->aliases[$value])) {
                $value = $this->def->info[$namespace][$key]->aliases[$value];
            }
            if ($this->def->info[$namespace][$key]->allowed !== true) {
                // check to see if the value is allowed
                if (!isset($this->def->info[$namespace][$key]->allowed[$value])) {
                    trigger_error('Value not supported, valid values are: ' .
                        $this->_listify($this->def->info[$namespace][$key]->allowed), E_USER_WARNING);
                    return;
                }
            }
        }
        if ($this->def->isError($value)) {
            trigger_error('Value for ' . "$namespace.$key" . ' is of invalid type, should be ' . $type, E_USER_WARNING);
            return;
        }
        $this->conf[$namespace][$key] = $value;
        
        // reset definitions if the directives they depend on changed
        // this is a very costly process, so it's discouraged 
        // with finalization
        if ($namespace == 'HTML' || $namespace == 'CSS') {
            $this->definitions[$namespace] = null;
        }