mirror of
https://github.com/EGroupware/egroupware.git
synced 2024-12-16 19:50:44 +01:00
8f797be836
- can be used via html class like:
$clean_html = html::purify($html);
- using it now in eTemplate to remove malicious code from html:
a) when displaying "formatted text"
b) when "formatted text" get's input by the user
498 lines
18 KiB
PHP
Executable File
498 lines
18 KiB
PHP
Executable File
<?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 = '3.3.0';
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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;
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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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* @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) {
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$this->plist = new HTMLPurifier_PropertyList($definition->defaultPlist);
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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 $ret;
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}
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/**
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* Convenience constructor that creates a default configuration object.
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* @return Default HTMLPurifier_Config object.
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*/
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public static function createDefault() {
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$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 $namespace String namespace
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* @param $key String key
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*/
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public function get($namespace, $key) {
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if (!$this->finalized) $this->autoFinalize ? $this->finalize() : $this->plist->squash(true);
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if (!isset($this->def->info[$namespace][$key])) {
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// can't add % due to SimpleTest bug
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trigger_error('Cannot retrieve value of undefined directive ' . htmlspecialchars("$namespace.$key"),
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E_USER_WARNING);
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return;
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}
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if (isset($this->def->info[$namespace][$key]->isAlias)) {
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$d = $this->def->info[$namespace][$key];
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trigger_error('Cannot get value from aliased directive, use real name ' . $d->namespace . '.' . $d->name,
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E_USER_ERROR);
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return;
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}
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return $this->plist->get("$namespace.$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 ? $this->finalize() : $this->plist->squash(true);
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if (!isset($this->def->info[$namespace])) {
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trigger_error('Cannot retrieve undefined namespace ' . htmlspecialchars($namespace),
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E_USER_WARNING);
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return;
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}
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$full = $this->getAll();
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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 $this->serial;
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}
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/**
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* Retrieves all directives, organized by namespace
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*/
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public function getAll() {
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if (!$this->finalized) $this->autoFinalize ? $this->finalize() : $this->plist->squash(true);
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$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 $namespace String namespace
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* @param $key String key
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* @param $value Mixed value
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*/
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public function set($namespace, $key, $value, $from_alias = false) {
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if ($this->isFinalized('Cannot set directive after finalization')) return;
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if (!isset($this->def->info[$namespace][$key])) {
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trigger_error('Cannot set undefined directive ' . htmlspecialchars("$namespace.$key") . ' to value',
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E_USER_WARNING);
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return;
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}
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$def = $this->def->info[$namespace][$key];
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if (isset($def->isAlias)) {
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if ($from_alias) {
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trigger_error('Double-aliases not allowed, please fix '.
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'ConfigSchema bug with' . "$namespace.$key", E_USER_ERROR);
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return;
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}
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$this->set($new_ns = $def->namespace,
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$new_dir = $def->name,
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$value, true);
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trigger_error("$namespace.$key is an alias, preferred directive name is $new_ns.$new_dir", 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 $e) {
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trigger_error('Value for ' . "$namespace.$key" . ' is of invalid type, should be ' . HTMLPurifier_VarParser::getTypeName($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[$value])) {
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trigger_error('Value not supported, valid values are: ' .
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$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("$namespace.$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' || $namespace == 'CSS') {
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$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 $raw Return a copy that has not been setup yet. Must be
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* called before it's been setup, otherwise won't work.
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*/
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public function getHTMLDefinition($raw = false) {
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return $this->getDefinition('HTML', $raw);
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}
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/**
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* Retrieves object reference to the CSS definition
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* @param $raw Return a copy that has not been setup yet. Must be
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* called before it's been setup, otherwise won't work.
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*/
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public function getCSSDefinition($raw = false) {
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return $this->getDefinition('CSS', $raw);
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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 $raw Whether or not definition should be returned raw
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*/
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public function getDefinition($type, $raw = false) {
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if (!$this->finalized) $this->autoFinalize ? $this->finalize() : $this->plist->squash(true);
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$factory = HTMLPurifier_DefinitionCacheFactory::instance();
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$cache = $factory->create($type, $this);
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if (!$raw) {
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// see if we can quickly supply a definition
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if (!empty($this->definitions[$type])) {
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if (!$this->definitions[$type]->setup) {
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$this->definitions[$type]->setup($this);
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$cache->set($this->definitions[$type], $this);
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}
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return $this->definitions[$type];
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}
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// memory check missed, try cache
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$this->definitions[$type] = $cache->get($this);
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if ($this->definitions[$type]) {
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// definition in cache, return it
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return $this->definitions[$type];
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}
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} elseif (
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!empty($this->definitions[$type]) &&
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!$this->definitions[$type]->setup
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) {
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// raw requested, raw in memory, quick return
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return $this->definitions[$type];
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}
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// quick checks failed, let's create the object
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if ($type == 'HTML') {
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$this->definitions[$type] = new HTMLPurifier_HTMLDefinition();
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} elseif ($type == 'CSS') {
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$this->definitions[$type] = new HTMLPurifier_CSSDefinition();
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} elseif ($type == 'URI') {
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$this->definitions[$type] = new HTMLPurifier_URIDefinition();
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} else {
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throw new HTMLPurifier_Exception("Definition of $type type not supported");
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}
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// quick abort if raw
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if ($raw) {
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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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return $this->definitions[$type];
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}
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// set it up
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$this->definitions[$type]->setup($this);
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// save in cache
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$cache->set($this->definitions[$type], $this);
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return $this->definitions[$type];
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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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// condensed form
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list($namespace, $directive) = explode('.', $key);
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$this->set($namespace, $directive, $value);
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} else {
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$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 $ns => $keypairs) {
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foreach ($keypairs as $directive => $def) {
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if ($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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}
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return $ret;
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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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* 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($ret);
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}
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/**
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* Prepares an array from a form into something usable for the more
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* strict parts of HTMLPurifier_Config
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*/
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public static function prepareArrayFromForm($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 = $mq_fix && function_exists('get_magic_quotes_gpc') && get_magic_quotes_gpc();
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$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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}
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return $ret;
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}
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/**
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* Loads configuration values from an ini file
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* @param $filename Name of ini file
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*/
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public function loadIni($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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}
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/**
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* Checks whether or not the configuration object is finalized.
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* @param $error String error message, or false for no error
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*/
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public function isFinalized($error = false) {
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if ($this->finalized && $error) {
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trigger_error($error, E_USER_ERROR);
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}
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return $this->finalized;
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}
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/**
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* Finalizes configuration only if auto finalize is on and not
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* already finalized
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*/
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public function autoFinalize() {
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if (!$this->finalized && $this->autoFinalize) $this->finalize();
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}
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/**
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* Finalizes a configuration object, prohibiting further change
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*/
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public function finalize() {
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$this->finalized = true;
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}
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}
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// vim: et sw=4 sts=4
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