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<?php /*! @mainpage * * HTML Purifier is an HTML filter that will take an arbitrary snippet of * HTML and rigorously test, validate and filter it into a version that * is safe for output onto webpages. It achieves this by: * * -# Lexing (parsing into tokens) the document, * -# Executing various strategies on the tokens: * -# Removing all elements not in the whitelist, * -# Making the tokens well-formed, * -# Fixing the nesting of the nodes, and * -# Validating attributes of the nodes; and * -# Generating HTML from the purified tokens. * * However, most users will only need to interface with the HTMLPurifier * and HTMLPurifier_Config. */ /* HTML Purifier 4.6.0 - Standards Compliant HTML Filtering Copyright (C) 2006-2008 Edward Z. Yang This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * Facade that coordinates HTML Purifier's subsystems in order to purify HTML. * * @note There are several points in which configuration can be specified * for HTML Purifier. The precedence of these (from lowest to * highest) is as follows: * -# Instance: new HTMLPurifier($config) * -# Invocation: purify($html, $config) * These configurations are entirely independent of each other and * are *not* merged (this behavior may change in the future). * * @todo We need an easier way to inject strategies using the configuration * object. */ class HTMLPurifier { /** * Version of HTML Purifier. * @type string */ public $version = '4.6.0'; /** * Constant with version of HTML Purifier. */ const VERSION = '4.6.0'; /** * Global configuration object. * @type HTMLPurifier_Config */ public $config; /** * Array of extra filter objects to run on HTML, * for backwards compatibility. * @type HTMLPurifier_Filter[] */ private $filters = array(); /** * Single instance of HTML Purifier. * @type HTMLPurifier */ private static $instance; /** * @type HTMLPurifier_Strategy_Core */ protected $strategy; /** * @type HTMLPurifier_Generator */ protected $generator; /** * Resultant context of last run purification. * Is an array of contexts if the last called method was purifyArray(). * @type HTMLPurifier_Context */ public $context; /** * Initializes the purifier. * * @param HTMLPurifier_Config $config Optional HTMLPurifier_Config object * for all instances of the purifier, if omitted, a default * configuration is supplied (which can be overridden on a * per-use basis). * The parameter can also be any type that * HTMLPurifier_Config::create() supports. */ public function __construct($config = null) { $this->config = HTMLPurifier_Config::create($config); $this->strategy = new HTMLPurifier_Strategy_Core(); } /** * Adds a filter to process the output. First come first serve * * @param HTMLPurifier_Filter $filter HTMLPurifier_Filter object */ public function addFilter($filter) { trigger_error( 'HTMLPurifier->addFilter() is deprecated, use configuration directives' . ' in the Filter namespace or Filter.Custom', E_USER_WARNING ); $this->filters[] = $filter; } /** * Filters an HTML snippet/document to be XSS-free and standards-compliant. * * @param string $html String of HTML to purify * @param HTMLPurifier_Config $config Config object for this operation, * if omitted, defaults to the config object specified during this * object's construction. The parameter can also be any type * that HTMLPurifier_Config::create() supports. * * @return string Purified HTML */ public function purify($html, $config = null) { // :TODO: make the config merge in, instead of replace $config = $config ? HTMLPurifier_Config::create($config) : $this->config; // implementation is partially environment dependant, partially // configuration dependant $lexer = HTMLPurifier_Lexer::create($config); $context = new HTMLPurifier_Context(); // setup HTML generator $this->generator = new HTMLPurifier_Generator($config, $context); $context->register('Generator', $this->generator); // set up global context variables if ($config->get('Core.CollectErrors')) { // may get moved out if other facilities use it $language_factory = HTMLPurifier_LanguageFactory::instance(); $language = $language_factory->create($config, $context); $context->register('Locale', $language); $error_collector = new HTMLPurifier_ErrorCollector($context); $context->register('ErrorCollector', $error_collector); } // setup id_accumulator context, necessary due to the fact that // AttrValidator can be called from many places $id_accumulator = HTMLPurifier_IDAccumulator::build($config, $context); $context->register('IDAccumulator', $id_accumulator); $html = HTMLPurifier_Encoder::convertToUTF8($html, $config, $context); // setup filters $filter_flags = $config->getBatch('Filter'); $custom_filters = $filter_flags['Custom']; unset($filter_flags['Custom']); $filters = array(); foreach ($filter_flags as $filter => $flag) { if (!$flag) { continue; } if (strpos($filter, '.') !== false) { continue; } $class = "HTMLPurifier_Filter_$filter"; $filters[] = new $class; } foreach ($custom_filters as $filter) { // maybe "HTMLPurifier_Filter_$filter", but be consistent with AutoFormat $filters[] = $filter; } $filters = array_merge($filters, $this->filters); // maybe prepare(), but later for ($i = 0, $filter_size = count($filters); $i < $filter_size; $i++) { $html = $filters[$i]->preFilter($html, $config, $context); } // purified HTML $html = $this->generator->generateFromTokens( // list of tokens $this->strategy->execute( // list of un-purified tokens $lexer->tokenizeHTML( // un-purified HTML $html, $config, $context ), $config, $context ) ); for ($i = $filter_size - 1; $i >= 0; $i--) { $html = $filters[$i]->postFilter($html, $config, $context); } $html = HTMLPurifier_Encoder::convertFromUTF8($html, $config, $context); $this->context =& $context; return $html; } /** * Filters an array of HTML snippets * * @param string[] $array_of_html Array of html snippets * @param HTMLPurifier_Config $config Optional config object for this operation. * See HTMLPurifier::purify() for more details. * * @return string[] Array of purified HTML */ public function purifyArray($array_of_html, $config = null) { $context_array = array(); foreach ($array_of_html as $key => $html) { $array_of_html[$key] = $this->purify($html, $config); $context_array[$key] = $this->context; } $this->context = $context_array; return $array_of_html; } /** * Singleton for enforcing just one HTML Purifier in your system * * @param HTMLPurifier|HTMLPurifier_Config $prototype Optional prototype * HTMLPurifier instance to overload singleton with, * or HTMLPurifier_Config instance to configure the * generated version with. * * @return HTMLPurifier */ public static function instance($prototype = null) { if (!self::$instance || $prototype) { if ($prototype instanceof HTMLPurifier) { self::$instance = $prototype; } elseif ($prototype) { self::$instance = new HTMLPurifier($prototype); } else { self::$instance = new HTMLPurifier(); } } return self::$instance; } /** * Singleton for enforcing just one HTML Purifier in your system * * @param HTMLPurifier|HTMLPurifier_Config $prototype Optional prototype * HTMLPurifier instance to overload singleton with, * or HTMLPurifier_Config instance to configure the * generated version with. * * @return HTMLPurifier * @note Backwards compatibility, see instance() */ public static function getInstance($prototype = null) { return HTMLPurifier::instance($prototype); } } // vim: et sw=4 sts=4
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