mirror of
https://github.com/ezyang/htmlpurifier.git
synced 2024-11-10 07:38:41 +00:00
710 lines
27 KiB
PHP
710 lines
27 KiB
PHP
<?php
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/**
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* Configuration object that triggers customizable behavior.
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*
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* @warning This class is strongly defined: that means that the class
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* will fail if an undefined directive is retrieved or set.
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*
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* @note Many classes that could (although many times don't) use the
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* configuration object make it a mandatory parameter. This is
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* because a configuration object should always be forwarded,
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* otherwise, you run the risk of missing a parameter and then
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* being stumped when a configuration directive doesn't work.
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*
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* @todo Reconsider some of the public member variables
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*/
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class HTMLPurifier_Config
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{
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/**
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* HTML Purifier's version
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*/
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public $version = '4.3.0';
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/**
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* Bool indicator whether or not to automatically finalize
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* the object if a read operation is done
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*/
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public $autoFinalize = true;
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// protected member variables
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/**
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* Namespace indexed array of serials for specific namespaces (see
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* getSerial() for more info).
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*/
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protected $serials = array();
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/**
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* Serial for entire configuration object
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*/
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protected $serial;
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/**
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* Parser for variables
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*/
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protected $parser = null;
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/**
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* Reference HTMLPurifier_ConfigSchema for value checking
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* @note This is public for introspective purposes. Please don't
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* abuse!
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*/
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public $def;
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/**
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* Indexed array of definitions
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*/
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protected $definitions;
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/**
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* Bool indicator whether or not config is finalized
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*/
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protected $finalized = false;
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/**
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* Property list containing configuration directives.
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*/
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protected $plist;
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/**
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* Whether or not a set is taking place due to an
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* alias lookup.
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*/
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private $aliasMode;
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/**
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* Set to false if you do not want line and file numbers in errors
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* (useful when unit testing). This will also compress some errors
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* and exceptions.
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*/
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public $chatty = true;
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/**
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* Current lock; only gets to this namespace are allowed.
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*/
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private $lock;
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/**
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* @param $definition HTMLPurifier_ConfigSchema that defines what directives
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* are allowed.
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*/
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public function __construct($definition, $parent = null) {
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$parent = $parent ? $parent : $definition->defaultPlist;
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$this->plist = new HTMLPurifier_PropertyList($parent);
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$this->def = $definition; // keep a copy around for checking
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$this->parser = new HTMLPurifier_VarParser_Flexible();
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}
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/**
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* Convenience constructor that creates a config object based on a mixed var
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* @param mixed $config Variable that defines the state of the config
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* object. Can be: a HTMLPurifier_Config() object,
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* an array of directives based on loadArray(),
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* or a string filename of an ini file.
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* @param HTMLPurifier_ConfigSchema Schema object
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* @return Configured HTMLPurifier_Config object
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*/
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public static function create($config, $schema = null) {
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if ($config instanceof HTMLPurifier_Config) {
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// pass-through
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return $config;
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}
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if (!$schema) {
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$ret = HTMLPurifier_Config::createDefault();
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} else {
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$ret = new HTMLPurifier_Config($schema);
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}
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if (is_string($config)) $ret->loadIni($config);
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elseif (is_array($config)) $ret->loadArray($config);
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return $ret;
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}
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/**
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* Creates a new config object that inherits from a previous one.
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* @param HTMLPurifier_Config $config Configuration object to inherit
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* from.
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* @return HTMLPurifier_Config object with $config as its parent.
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*/
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public static function inherit(HTMLPurifier_Config $config) {
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return new HTMLPurifier_Config($config->def, $config->plist);
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}
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/**
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* Convenience constructor that creates a default configuration object.
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* @return Default HTMLPurifier_Config object.
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*/
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public static function createDefault() {
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$definition = HTMLPurifier_ConfigSchema::instance();
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$config = new HTMLPurifier_Config($definition);
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return $config;
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}
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/**
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* Retreives a value from the configuration.
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* @param $key String key
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*/
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public function get($key, $a = null) {
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if ($a !== null) {
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$this->triggerError("Using deprecated API: use \$config->get('$key.$a') instead", E_USER_WARNING);
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$key = "$key.$a";
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}
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if (!$this->finalized) $this->autoFinalize();
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if (!isset($this->def->info[$key])) {
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// can't add % due to SimpleTest bug
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$this->triggerError('Cannot retrieve value of undefined directive ' . htmlspecialchars($key),
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E_USER_WARNING);
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return;
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}
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if (isset($this->def->info[$key]->isAlias)) {
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$d = $this->def->info[$key];
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$this->triggerError('Cannot get value from aliased directive, use real name ' . $d->key,
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E_USER_ERROR);
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return;
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}
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if ($this->lock) {
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list($ns) = explode('.', $key);
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if ($ns !== $this->lock) {
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$this->triggerError('Cannot get value of namespace ' . $ns . ' when lock for ' . $this->lock . ' is active, this probably indicates a Definition setup method is accessing directives that are not within its namespace', E_USER_ERROR);
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return;
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}
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}
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return $this->plist->get($key);
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}
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/**
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* Retreives an array of directives to values from a given namespace
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* @param $namespace String namespace
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*/
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public function getBatch($namespace) {
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if (!$this->finalized) $this->autoFinalize();
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$full = $this->getAll();
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if (!isset($full[$namespace])) {
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$this->triggerError('Cannot retrieve undefined namespace ' . htmlspecialchars($namespace),
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E_USER_WARNING);
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return;
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}
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return $full[$namespace];
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}
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/**
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* Returns a md5 signature of a segment of the configuration object
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* that uniquely identifies that particular configuration
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* @note Revision is handled specially and is removed from the batch
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* before processing!
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* @param $namespace Namespace to get serial for
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*/
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public function getBatchSerial($namespace) {
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if (empty($this->serials[$namespace])) {
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$batch = $this->getBatch($namespace);
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unset($batch['DefinitionRev']);
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$this->serials[$namespace] = md5(serialize($batch));
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}
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return $this->serials[$namespace];
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}
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/**
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* Returns a md5 signature for the entire configuration object
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* that uniquely identifies that particular configuration
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*/
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public function getSerial() {
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if (empty($this->serial)) {
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$this->serial = md5(serialize($this->getAll()));
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}
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return $this->serial;
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}
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/**
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* Retrieves all directives, organized by namespace
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* @warning This is a pretty inefficient function, avoid if you can
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*/
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public function getAll() {
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if (!$this->finalized) $this->autoFinalize();
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$ret = array();
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foreach ($this->plist->squash() as $name => $value) {
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list($ns, $key) = explode('.', $name, 2);
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$ret[$ns][$key] = $value;
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}
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return $ret;
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}
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/**
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* Sets a value to configuration.
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* @param $key String key
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* @param $value Mixed value
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*/
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public function set($key, $value, $a = null) {
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if (strpos($key, '.') === false) {
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$namespace = $key;
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$directive = $value;
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$value = $a;
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$key = "$key.$directive";
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$this->triggerError("Using deprecated API: use \$config->set('$key', ...) instead", E_USER_NOTICE);
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} else {
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list($namespace) = explode('.', $key);
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}
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if ($this->isFinalized('Cannot set directive after finalization')) return;
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if (!isset($this->def->info[$key])) {
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$this->triggerError('Cannot set undefined directive ' . htmlspecialchars($key) . ' to value',
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E_USER_WARNING);
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return;
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}
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$def = $this->def->info[$key];
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if (isset($def->isAlias)) {
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if ($this->aliasMode) {
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$this->triggerError('Double-aliases not allowed, please fix '.
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'ConfigSchema bug with' . $key, E_USER_ERROR);
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return;
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}
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$this->aliasMode = true;
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$this->set($def->key, $value);
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$this->aliasMode = false;
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$this->triggerError("$key is an alias, preferred directive name is {$def->key}", E_USER_NOTICE);
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return;
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}
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// Raw type might be negative when using the fully optimized form
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// of stdclass, which indicates allow_null == true
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$rtype = is_int($def) ? $def : $def->type;
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if ($rtype < 0) {
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$type = -$rtype;
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$allow_null = true;
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} else {
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$type = $rtype;
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$allow_null = isset($def->allow_null);
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}
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try {
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$value = $this->parser->parse($value, $type, $allow_null);
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} catch (HTMLPurifier_VarParserException $e) {
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$this->triggerError('Value for ' . $key . ' is of invalid type, should be ' . HTMLPurifier_VarParser::getTypeName($type), E_USER_WARNING);
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return;
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}
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if (is_string($value) && is_object($def)) {
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// resolve value alias if defined
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if (isset($def->aliases[$value])) {
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$value = $def->aliases[$value];
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}
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// check to see if the value is allowed
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if (isset($def->allowed) && !isset($def->allowed[$value])) {
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$this->triggerError('Value not supported, valid values are: ' .
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$this->_listify($def->allowed), E_USER_WARNING);
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return;
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}
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}
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$this->plist->set($key, $value);
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// reset definitions if the directives they depend on changed
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// this is a very costly process, so it's discouraged
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// with finalization
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if ($namespace == 'HTML' || $namespace == 'CSS' || $namespace == 'URI') {
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$this->definitions[$namespace] = null;
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}
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$this->serials[$namespace] = false;
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}
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/**
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* Convenience function for error reporting
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*/
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private function _listify($lookup) {
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$list = array();
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foreach ($lookup as $name => $b) $list[] = $name;
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return implode(', ', $list);
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}
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/**
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* Retrieves object reference to the HTML definition.
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* @param $raw Return a copy that has not been setup yet. Must be
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* called before it's been setup, otherwise won't work.
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* @param $optimized If true, this method may return null, to
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* indicate that a cached version of the modified
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* definition object is available and no further edits
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* are necessary. Consider using
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* maybeGetRawHTMLDefinition, which is more explicitly
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* named, instead.
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*/
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public function getHTMLDefinition($raw = false, $optimized = false) {
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return $this->getDefinition('HTML', $raw, $optimized);
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}
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/**
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* Retrieves object reference to the CSS definition
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* @param $raw Return a copy that has not been setup yet. Must be
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* called before it's been setup, otherwise won't work.
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* @param $optimized If true, this method may return null, to
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* indicate that a cached version of the modified
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* definition object is available and no further edits
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* are necessary. Consider using
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* maybeGetRawCSSDefinition, which is more explicitly
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* named, instead.
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*/
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public function getCSSDefinition($raw = false, $optimized = false) {
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return $this->getDefinition('CSS', $raw, $optimized);
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}
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/**
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* Retrieves object reference to the URI definition
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* @param $raw Return a copy that has not been setup yet. Must be
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* called before it's been setup, otherwise won't work.
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* @param $optimized If true, this method may return null, to
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* indicate that a cached version of the modified
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* definition object is available and no further edits
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* are necessary. Consider using
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* maybeGetRawURIDefinition, which is more explicitly
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* named, instead.
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*/
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public function getURIDefinition($raw = false, $optimized = false) {
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return $this->getDefinition('URI', $raw, $optimized);
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}
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/**
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* Retrieves a definition
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* @param $type Type of definition: HTML, CSS, etc
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* @param $raw Whether or not definition should be returned raw
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* @param $optimized Only has an effect when $raw is true. Whether
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* or not to return null if the result is already present in
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* the cache. This is off by default for backwards
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* compatibility reasons, but you need to do things this
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* way in order to ensure that caching is done properly.
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* Check out enduser-customize.html for more details.
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* We probably won't ever change this default, as much as the
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* maybe semantics is the "right thing to do."
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*/
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public function getDefinition($type, $raw = false, $optimized = false) {
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if ($optimized && !$raw) {
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throw new HTMLPurifier_Exception("Cannot set optimized = true when raw = false");
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}
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if (!$this->finalized) $this->autoFinalize();
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// temporarily suspend locks, so we can handle recursive definition calls
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$lock = $this->lock;
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$this->lock = null;
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$factory = HTMLPurifier_DefinitionCacheFactory::instance();
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$cache = $factory->create($type, $this);
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$this->lock = $lock;
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if (!$raw) {
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// full definition
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// ---------------
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// check if definition is in memory
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if (!empty($this->definitions[$type])) {
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$def = $this->definitions[$type];
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// check if the definition is setup
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if ($def->setup) {
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return $def;
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} else {
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$def->setup($this);
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if ($def->optimized) $cache->add($def, $this);
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return $def;
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}
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}
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// check if definition is in cache
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$def = $cache->get($this);
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if ($def) {
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// definition in cache, save to memory and return it
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$this->definitions[$type] = $def;
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return $def;
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}
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// initialize it
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$def = $this->initDefinition($type);
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// set it up
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$this->lock = $type;
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$def->setup($this);
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$this->lock = null;
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// save in cache
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$cache->add($def, $this);
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// return it
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return $def;
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} else {
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// raw definition
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// --------------
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// check preconditions
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$def = null;
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if ($optimized) {
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if (is_null($this->get($type . '.DefinitionID'))) {
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// fatally error out if definition ID not set
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throw new HTMLPurifier_Exception("Cannot retrieve raw version without specifying %$type.DefinitionID");
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}
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}
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if (!empty($this->definitions[$type])) {
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$def = $this->definitions[$type];
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if ($def->setup && !$optimized) {
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$extra = $this->chatty ? " (try moving this code block earlier in your initialization)" : "";
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throw new HTMLPurifier_Exception("Cannot retrieve raw definition after it has already been setup" . $extra);
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}
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if ($def->optimized === null) {
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$extra = $this->chatty ? " (try flushing your cache)" : "";
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throw new HTMLPurifier_Exception("Optimization status of definition is unknown" . $extra);
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}
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if ($def->optimized !== $optimized) {
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$msg = $optimized ? "optimized" : "unoptimized";
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$extra = $this->chatty ? " (this backtrace is for the first inconsistent call, which was for a $msg raw definition)" : "";
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throw new HTMLPurifier_Exception("Inconsistent use of optimized and unoptimized raw definition retrievals" . $extra);
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}
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}
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// check if definition was in memory
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if ($def) {
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if ($def->setup) {
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// invariant: $optimized === true (checked above)
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return null;
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} else {
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return $def;
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}
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}
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// if optimized, check if definition was in cache
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// (because we do the memory check first, this formulation
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// is prone to cache slamming, but I think
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// guaranteeing that either /all/ of the raw
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// setup code or /none/ of it is run is more important.)
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if ($optimized) {
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// This code path only gets run once; once we put
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// something in $definitions (which is guaranteed by the
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// trailing code), we always short-circuit above.
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$def = $cache->get($this);
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if ($def) {
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// save the full definition for later, but don't
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// return it yet
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$this->definitions[$type] = $def;
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return null;
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}
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}
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// check invariants for creation
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if (!$optimized) {
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if (!is_null($this->get($type . '.DefinitionID'))) {
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if ($this->chatty) {
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$this->triggerError("Due to a documentation error in previous version of HTML Purifier, your definitions are not being cached. If this is OK, you can remove the %$type.DefinitionRev and %$type.DefinitionID declaration. Otherwise, modify your code to use maybeGetRawDefinition, and test if the returned value is null before making any edits (if it is null, that means that a cached version is available, and no raw operations are necessary). See <a href='http://htmlpurifier.org/docs/enduser-customize.html#optimized'>Customize</a> for more details", E_USER_WARNING);
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} else {
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$this->triggerError("Useless DefinitionID declaration", E_USER_WARNING);
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}
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}
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}
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// initialize it
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$def = $this->initDefinition($type);
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$def->optimized = $optimized;
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return $def;
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}
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throw new HTMLPurifier_Exception("The impossible happened!");
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}
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private function initDefinition($type) {
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// quick checks failed, let's create the object
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if ($type == 'HTML') {
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$def = new HTMLPurifier_HTMLDefinition();
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} elseif ($type == 'CSS') {
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$def = new HTMLPurifier_CSSDefinition();
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} elseif ($type == 'URI') {
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$def = new HTMLPurifier_URIDefinition();
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} else {
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throw new HTMLPurifier_Exception("Definition of $type type not supported");
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}
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$this->definitions[$type] = $def;
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return $def;
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}
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public function maybeGetRawDefinition($name) {
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return $this->getDefinition($name, true, true);
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}
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public function maybeGetRawHTMLDefinition() {
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return $this->getDefinition('HTML', true, true);
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}
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public function maybeGetRawCSSDefinition() {
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return $this->getDefinition('CSS', true, true);
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}
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public function maybeGetRawURIDefinition() {
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return $this->getDefinition('URI', true, true);
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}
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/**
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* Loads configuration values from an array with the following structure:
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* Namespace.Directive => Value
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* @param $config_array Configuration associative array
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*/
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public function loadArray($config_array) {
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if ($this->isFinalized('Cannot load directives after finalization')) return;
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foreach ($config_array as $key => $value) {
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$key = str_replace('_', '.', $key);
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if (strpos($key, '.') !== false) {
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$this->set($key, $value);
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} else {
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$namespace = $key;
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$namespace_values = $value;
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foreach ($namespace_values as $directive => $value) {
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$this->set($namespace .'.'. $directive, $value);
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}
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}
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}
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}
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/**
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* Returns a list of array(namespace, directive) for all directives
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* that are allowed in a web-form context as per an allowed
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* namespaces/directives list.
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* @param $allowed List of allowed namespaces/directives
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*/
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public static function getAllowedDirectivesForForm($allowed, $schema = null) {
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if (!$schema) {
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$schema = HTMLPurifier_ConfigSchema::instance();
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}
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if ($allowed !== true) {
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if (is_string($allowed)) $allowed = array($allowed);
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$allowed_ns = array();
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$allowed_directives = array();
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$blacklisted_directives = array();
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foreach ($allowed as $ns_or_directive) {
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if (strpos($ns_or_directive, '.') !== false) {
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// directive
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if ($ns_or_directive[0] == '-') {
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$blacklisted_directives[substr($ns_or_directive, 1)] = true;
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} else {
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$allowed_directives[$ns_or_directive] = true;
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}
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} else {
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// namespace
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$allowed_ns[$ns_or_directive] = true;
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}
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}
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}
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$ret = array();
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foreach ($schema->info as $key => $def) {
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list($ns, $directive) = explode('.', $key, 2);
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if ($allowed !== true) {
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if (isset($blacklisted_directives["$ns.$directive"])) continue;
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if (!isset($allowed_directives["$ns.$directive"]) && !isset($allowed_ns[$ns])) continue;
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}
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if (isset($def->isAlias)) continue;
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if ($directive == 'DefinitionID' || $directive == 'DefinitionRev') continue;
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$ret[] = array($ns, $directive);
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}
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return $ret;
|
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}
|
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|
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/**
|
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* Loads configuration values from $_GET/$_POST that were posted
|
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* via ConfigForm
|
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* @param $array $_GET or $_POST array to import
|
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* @param $index Index/name that the config variables are in
|
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* @param $allowed List of allowed namespaces/directives
|
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* @param $mq_fix Boolean whether or not to enable magic quotes fix
|
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* @param $schema Instance of HTMLPurifier_ConfigSchema to use, if not global copy
|
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*/
|
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public static function loadArrayFromForm($array, $index = false, $allowed = true, $mq_fix = true, $schema = null) {
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$ret = HTMLPurifier_Config::prepareArrayFromForm($array, $index, $allowed, $mq_fix, $schema);
|
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$config = HTMLPurifier_Config::create($ret, $schema);
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return $config;
|
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}
|
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|
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/**
|
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* Merges in configuration values from $_GET/$_POST to object. NOT STATIC.
|
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* @note Same parameters as loadArrayFromForm
|
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*/
|
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public function mergeArrayFromForm($array, $index = false, $allowed = true, $mq_fix = true) {
|
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$ret = HTMLPurifier_Config::prepareArrayFromForm($array, $index, $allowed, $mq_fix, $this->def);
|
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$this->loadArray($ret);
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}
|
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|
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/**
|
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* Prepares an array from a form into something usable for the more
|
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* strict parts of HTMLPurifier_Config
|
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*/
|
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public static function prepareArrayFromForm($array, $index = false, $allowed = true, $mq_fix = true, $schema = null) {
|
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if ($index !== false) $array = (isset($array[$index]) && is_array($array[$index])) ? $array[$index] : array();
|
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$mq = $mq_fix && function_exists('get_magic_quotes_gpc') && get_magic_quotes_gpc();
|
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|
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$allowed = HTMLPurifier_Config::getAllowedDirectivesForForm($allowed, $schema);
|
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$ret = array();
|
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foreach ($allowed as $key) {
|
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list($ns, $directive) = $key;
|
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$skey = "$ns.$directive";
|
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if (!empty($array["Null_$skey"])) {
|
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$ret[$ns][$directive] = null;
|
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continue;
|
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}
|
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if (!isset($array[$skey])) continue;
|
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$value = $mq ? stripslashes($array[$skey]) : $array[$skey];
|
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$ret[$ns][$directive] = $value;
|
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}
|
|
return $ret;
|
|
}
|
|
|
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/**
|
|
* Loads configuration values from an ini file
|
|
* @param $filename Name of ini file
|
|
*/
|
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public function loadIni($filename) {
|
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if ($this->isFinalized('Cannot load directives after finalization')) return;
|
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$array = parse_ini_file($filename, true);
|
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$this->loadArray($array);
|
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}
|
|
|
|
/**
|
|
* Checks whether or not the configuration object is finalized.
|
|
* @param $error String error message, or false for no error
|
|
*/
|
|
public function isFinalized($error = false) {
|
|
if ($this->finalized && $error) {
|
|
$this->triggerError($error, E_USER_ERROR);
|
|
}
|
|
return $this->finalized;
|
|
}
|
|
|
|
/**
|
|
* Finalizes configuration only if auto finalize is on and not
|
|
* already finalized
|
|
*/
|
|
public function autoFinalize() {
|
|
if ($this->autoFinalize) {
|
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$this->finalize();
|
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} else {
|
|
$this->plist->squash(true);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Finalizes a configuration object, prohibiting further change
|
|
*/
|
|
public function finalize() {
|
|
$this->finalized = true;
|
|
$this->parser = null;
|
|
}
|
|
|
|
/**
|
|
* Produces a nicely formatted error message by supplying the
|
|
* stack frame information OUTSIDE of HTMLPurifier_Config.
|
|
*/
|
|
protected function triggerError($msg, $no) {
|
|
// determine previous stack frame
|
|
$extra = '';
|
|
if ($this->chatty) {
|
|
$trace = debug_backtrace();
|
|
// zip(tail(trace), trace) -- but PHP is not Haskell har har
|
|
for ($i = 0, $c = count($trace); $i < $c - 1; $i++) {
|
|
if ($trace[$i + 1]['class'] === 'HTMLPurifier_Config') {
|
|
continue;
|
|
}
|
|
$frame = $trace[$i];
|
|
$extra = " invoked on line {$frame['line']} in file {$frame['file']}";
|
|
break;
|
|
}
|
|
}
|
|
trigger_error($msg . $extra, $no);
|
|
}
|
|
|
|
/**
|
|
* Returns a serialized form of the configuration object that can
|
|
* be reconstituted.
|
|
*/
|
|
public function serialize() {
|
|
$this->getDefinition('HTML');
|
|
$this->getDefinition('CSS');
|
|
$this->getDefinition('URI');
|
|
return serialize($this);
|
|
}
|
|
|
|
}
|
|
|
|
// vim: et sw=4 sts=4
|