library/HTMLPurifier/Config.php

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<?php

class HTMLPurifier_Config
{
    
    public $version = '3.1.1';
    
    public $autoFinalize = true;
    
    // protected member variables
    
    protected $serials = array();
    
    protected $serial;
    
    protected $conf;
    
    protected $parser;
    
    public $def;
    
    protected $definitions;
    
    protected $finalized = false;
    
    public function __construct($definition) {
        $this->conf = $definition->defaults; // set up, copy in defaults
        $this->def  = $definition; // keep a copy around for checking
        $this->parser = new HTMLPurifier_VarParser_Flexible();
    }
    
    public static function create($config, $schema = null) {
        if ($config instanceof HTMLPurifier_Config) {
            // pass-through
            return $config;
        }
        if (!$schema) {
            $ret = HTMLPurifier_Config::createDefault();
        } else {
            $ret = new HTMLPurifier_Config($schema);
        }
        if (is_string($config)) $ret->loadIni($config);
        elseif (is_array($config)) $ret->loadArray($config);
        return $ret;
    }
    
    public static function createDefault() {
        $definition = HTMLPurifier_ConfigSchema::instance();
        $config = new HTMLPurifier_Config($definition);
        return $config;
    }
    
    public function get($namespace, $key) {
        if (!$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 (isset($this->def->info[$namespace][$key]->isAlias)) {
            $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];
    }
    
    public 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];
    }
    
    public 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];
    }
    
    public function getSerial() {
        if (empty($this->serial)) {
            $this->serial = md5(serialize($this->getAll()));
        }
        return $this->serial;
    }
    
    public function getAll() {
        if (!$this->finalized && $this->autoFinalize) $this->finalize();
        return $this->conf;
    }
    
    public 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;
        }
        $def = $this->def->info[$namespace][$key];
        
        if (isset($def->isAlias)) {
            if ($from_alias) {
                trigger_error('Double-aliases not allowed, please fix '.
                    'ConfigSchema bug with' . "$namespace.$key", E_USER_ERROR);
                return;
            }
            $this->set($new_ns  = $def->namespace,
                       $new_dir = $def->name,
                       $value, true);
            trigger_error("$namespace.$key is an alias, preferred directive name is $new_ns.$new_dir", E_USER_NOTICE);
            return;
        }
        
        // Raw type might be negative when using the fully optimized form
        // of stdclass, which indicates allow_null == true
        $rtype = is_int($def) ? $def : $def->type;
        if ($rtype < 0) {
            $type = -$rtype;
            $allow_null = true;
        } else {
            $type = $rtype;
            $allow_null = isset($def->allow_null);
        }
        
        try {
            $value = $this->parser->parse($value, $type, $allow_null);
        } catch (HTMLPurifier_VarParserException $e) {
            trigger_error('Value for ' . "$namespace.$key" . ' is of invalid type, should be ' . HTMLPurifier_VarParser::getTypeName($type), E_USER_WARNING);
            return;
        }
        if (is_string($value) && is_object($def)) {
            // resolve value alias if defined
            if (isset($def->aliases[$value])) {
                $value = $def->aliases[$value];
            }
            // check to see if the value is allowed
            if (isset($def->allowed) && !isset($def->allowed[$value])) {
                trigger_error('Value not supported, valid values are: ' .
                    $this->_listify($def->allowed), 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;
        }
        
        $this->serials[$namespace] = false;
    }
    
    private function _listify($lookup) {
        $list = array();
        foreach ($lookup as $name => $b) $list[] = $name;
        return implode(', ', $list);
    }
    
    public function getHTMLDefinition($raw = false) {
        return $this->getDefinition('HTML', $raw);
    }
    
    public function getCSSDefinition($raw = false) {
        return $this->getDefinition('CSS', $raw);
    }
    
    public function getDefinition($type, $raw = false) {
        if (!$this->finalized && $this->autoFinalize) $this->finalize();
        $factory = HTMLPurifier_DefinitionCacheFactory::instance();
        $cache = $factory->create($type, $this);
        if (!$raw) {
            // see if we can quickly supply a definition
            if (!empty($this->definitions[$type])) {
                if (!$this->definitions[$type]->setup) {
                    $this->definitions[$type]->setup($this);
                    $cache->set($this->definitions[$type], $this);
                }
                return $this->definitions[$type];
            }
            // memory check missed, try cache
            $this->definitions[$type] = $cache->get($this);
            if ($this->definitions[$type]) {
                // definition in cache, return it
                return $this->definitions[$type];
            }
        } elseif (
            !empty($this->definitions[$type]) &&
            !$this->definitions[$type]->setup
        ) {
            // raw requested, raw in memory, quick return
            return $this->definitions[$type];
        }
        // quick checks failed, let's create the object
        if ($type == 'HTML') {
            $this->definitions[$type] = new HTMLPurifier_HTMLDefinition();
        } elseif ($type == 'CSS') {
            $this->definitions[$type] = new HTMLPurifier_CSSDefinition();
        } elseif ($type == 'URI') {
            $this->definitions[$type] = new HTMLPurifier_URIDefinition();
        } else {
            throw new HTMLPurifier_Exception("Definition of $type type not supported");
        }
        // quick abort if raw
        if ($raw) {
            if (is_null($this->get($type, 'DefinitionID'))) {
                // fatally error out if definition ID not set
                throw new HTMLPurifier_Exception("Cannot retrieve raw version without specifying %$type.DefinitionID");
            }
            return $this->definitions[$type];
        }
        // set it up
        $this->definitions[$type]->setup($this);
        // save in cache
        $cache->set($this->definitions[$type], $this);
        return $this->definitions[$type];
    }
    
    public function loadArray($config_array) {
        if ($this->isFinalized('Cannot load directives after finalization')) return;
        foreach ($config_array as $key => $value) {
            $key = str_replace('_', '.', $key);
            if (strpos($key, '.') !== false) {
                // condensed form
                list($namespace, $directive) = explode('.', $key);
                $this->set($namespace, $directive, $value);
            } else {
                $namespace = $key;
                $namespace_values = $value;
                foreach ($namespace_values as $directive => $value) {
                    $this->set($namespace, $directive, $value);
                }
            }
        }
    }
    
    public static function getAllowedDirectivesForForm($allowed, $schema = null) {
        if (!$schema) {
            $schema = HTMLPurifier_ConfigSchema::instance();
        }
        if ($allowed !== true) {
             if (is_string($allowed)) $allowed = array($allowed);
             $allowed_ns = array();
             $allowed_directives = array();
             $blacklisted_directives = array();
             foreach ($allowed as $ns_or_directive) {
                 if (strpos($ns_or_directive, '.') !== false) {
                     // directive
                     if ($ns_or_directive[0] == '-') {
                         $blacklisted_directives[substr($ns_or_directive, 1)] = true;
                     } else {
                         $allowed_directives[$ns_or_directive] = true;
                     }
                 } else {
                     // namespace
                     $allowed_ns[$ns_or_directive] = true;
                 }
             }
        }
        $ret = array();
        foreach ($schema->info as $ns => $keypairs) {
            foreach ($keypairs as $directive => $def) {
                if ($allowed !== true) {
                    if (isset($blacklisted_directives["$ns.$directive"])) continue;
                    if (!isset($allowed_directives["$ns.$directive"]) && !isset($allowed_ns[$ns])) continue;
                }
                if (isset($def->isAlias)) continue;
                if ($directive == 'DefinitionID' || $directive == 'DefinitionRev') continue;
                $ret[] = array($ns, $directive);
            }
        }
        return $ret;
    }
    
    public static function loadArrayFromForm($array, $index = false, $allowed = true, $mq_fix = true, $schema = null) {
        $ret = HTMLPurifier_Config::prepareArrayFromForm($array, $index, $allowed, $mq_fix, $schema);
        $config = HTMLPurifier_Config::create($ret, $schema);
        return $config;
    }
    
    public function mergeArrayFromForm($array, $index = false, $allowed = true, $mq_fix = true) {
         $ret = HTMLPurifier_Config::prepareArrayFromForm($array, $index, $allowed, $mq_fix, $this->def);
         $this->loadArray($ret);
    }
    
    public static function prepareArrayFromForm($array, $index = false, $allowed = true, $mq_fix = true, $schema = null) {
        if ($index !== false) $array = (isset($array[$index]) && is_array($array[$index])) ? $array[$index] : array();
        $mq = $mq_fix && function_exists('get_magic_quotes_gpc') && get_magic_quotes_gpc();
        
        $allowed = HTMLPurifier_Config::getAllowedDirectivesForForm($allowed, $schema);
        $ret = array();
        foreach ($allowed as $key) {
            list($ns, $directive) = $key;
            $skey = "$ns.$directive";
            if (!empty($array["Null_$skey"])) {
                $ret[$ns][$directive] = null;
                continue;
            }
            if (!isset($array[$skey])) continue;
            $value = $mq ? stripslashes($array[$skey]) : $array[$skey];
            $ret[$ns][$directive] = $value;
        }
        return $ret;
    }
    
    public function loadIni($filename) {
        if ($this->isFinalized('Cannot load directives after finalization')) return;
        $array = parse_ini_file($filename, true);
        $this->loadArray($array);
    }
    
    public function isFinalized($error = false) {
        if ($this->finalized && $error) {
            trigger_error($error, E_USER_ERROR);
        }
        return $this->finalized;
    }
    
    public function autoFinalize() {
        if (!$this->finalized && $this->autoFinalize) $this->finalize();
    }
    
    public function finalize() {
        $this->finalized = true;
    }
    
}

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