mirror of
https://github.com/ezyang/htmlpurifier.git
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f7eccc0038
git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@1061 48356398-32a2-884e-a903-53898d9a118a
371 lines
13 KiB
PHP
371 lines
13 KiB
PHP
<?php
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require_once 'HTMLPurifier/HTMLModule.php';
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require_once 'HTMLPurifier/ElementDef.php';
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require_once 'HTMLPurifier/Doctype.php';
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require_once 'HTMLPurifier/DoctypeRegistry.php';
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require_once 'HTMLPurifier/ContentSets.php';
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require_once 'HTMLPurifier/AttrTypes.php';
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require_once 'HTMLPurifier/AttrCollections.php';
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require_once 'HTMLPurifier/AttrDef.php';
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require_once 'HTMLPurifier/AttrDef/Enum.php';
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// W3C modules
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require_once 'HTMLPurifier/HTMLModule/CommonAttributes.php';
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require_once 'HTMLPurifier/HTMLModule/Text.php';
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require_once 'HTMLPurifier/HTMLModule/Hypertext.php';
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require_once 'HTMLPurifier/HTMLModule/List.php';
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require_once 'HTMLPurifier/HTMLModule/Presentation.php';
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require_once 'HTMLPurifier/HTMLModule/Edit.php';
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require_once 'HTMLPurifier/HTMLModule/Bdo.php';
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require_once 'HTMLPurifier/HTMLModule/Tables.php';
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require_once 'HTMLPurifier/HTMLModule/Image.php';
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require_once 'HTMLPurifier/HTMLModule/StyleAttribute.php';
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require_once 'HTMLPurifier/HTMLModule/Legacy.php';
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require_once 'HTMLPurifier/HTMLModule/Target.php';
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require_once 'HTMLPurifier/HTMLModule/Scripting.php';
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// proprietary modules
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require_once 'HTMLPurifier/HTMLModule/TransformToStrict.php';
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require_once 'HTMLPurifier/HTMLModule/TransformToXHTML11.php';
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HTMLPurifier_ConfigSchema::define(
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'HTML', 'Doctype', null, 'string/null',
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'Doctype to use, pre-defined values are HTML 4.01 Transitional, HTML 4.01 '.
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'Strict, XHTML 1.0 Transitional, XHTML 1.0 Strict, XHTML 1.1. '.
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'Technically speaking this is not actually a doctype (as it does '.
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'not identify a corresponding DTD), but we are using this name '.
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'for sake of simplicity. This will override any older directives '.
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'like %Core.XHTML or %HTML.Strict.'
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);
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HTMLPurifier_ConfigSchema::define(
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'HTML', 'Trusted', false, 'bool',
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'Indicates whether or not the user input is trusted or not. If the '.
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'input is trusted, a more expansive set of allowed tags and attributes '.
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'will be used. This directive has been available since 1.7.0.'
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);
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class HTMLPurifier_HTMLModuleManager
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{
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/**
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* Instance of HTMLPurifier_DoctypeRegistry
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* @public
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*/
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var $doctypes;
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/**
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* Instance of HTMLPurifier_AttrTypes
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* @public
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*/
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var $attrTypes;
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/**
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* Active instances of modules for the specified doctype are
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* indexed, by name, in this array.
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*/
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var $modules = array();
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/**
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* Array of recognized HTMLPurifier_Module instances, indexed by
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* module's class name. This array is usually lazy loaded, but a
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* user can overload a module by pre-emptively registering it.
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*/
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var $registeredModules = array();
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/**
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* Associative array of element name to list of modules that have
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* definitions for the element; this array is dynamically filled.
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*/
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var $elementLookup = array();
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/** List of prefixes we should use for registering small names */
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var $prefixes = array('HTMLPurifier_HTMLModule_');
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var $contentSets; /**< Instance of HTMLPurifier_ContentSets */
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var $attrCollections; /**< Instance of HTMLPurifier_AttrCollections */
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/** If set to true, unsafe elements and attributes will be allowed */
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var $trusted = false;
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function HTMLPurifier_HTMLModuleManager() {
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// editable internal objects
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$this->attrTypes = new HTMLPurifier_AttrTypes();
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$this->doctypes = new HTMLPurifier_DoctypeRegistry();
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// setup default HTML doctypes
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// module reuse
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$common = array(
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'CommonAttributes', 'Text', 'Hypertext', 'List',
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'Presentation', 'Edit', 'Bdo', 'Tables', 'Image',
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'StyleAttribute', 'Scripting'
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);
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$transitional = array('Legacy', 'Target');
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$this->doctypes->register(
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'HTML 4.01 Transitional',
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array_merge($common, $transitional),
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array('correctional' => array('TransformToStrict'))
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);
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$this->doctypes->register(
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'XHTML 1.0 Transitional',
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array_merge($common, $transitional),
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array('correctional' => array('TransformToStrict'))
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);
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$this->doctypes->register(
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'HTML 4.01 Strict',
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array_merge($common),
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array('lenient' => array('TransformToStrict'))
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);
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$this->doctypes->register(
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'XHTML 1.0 Strict',
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array_merge($common),
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array('lenient' => array('TransformToStrict'))
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);
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$this->doctypes->register(
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'XHTML 1.1',
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array_merge($common),
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array('lenient' => array('TransformToStrict', 'TransformToXHTML11'))
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);
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}
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/**
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* Registers a module to the recognized module list, useful for
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* overloading pre-existing modules.
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* @param $module Mixed: string module name, with or without
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* HTMLPurifier_HTMLModule prefix, or instance of
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* subclass of HTMLPurifier_HTMLModule.
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* @note This function will not call autoload, you must instantiate
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* (and thus invoke) autoload outside the method.
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* @note If a string is passed as a module name, different variants
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* will be tested in this order:
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* - Check for HTMLPurifier_HTMLModule_$name
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* - Check all prefixes with $name in order they were added
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* - Check for literal object name
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* - Throw fatal error
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* If your object name collides with an internal class, specify
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* your module manually. All modules must have been included
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* externally: registerModule will not perform inclusions for you!
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* @warning If your module has the same name as an already loaded
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* module, your module will overload the old one WITHOUT
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* warning.
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*/
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function registerModule($module) {
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if (is_string($module)) {
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// attempt to load the module
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$original_module = $module;
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$ok = false;
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foreach ($this->prefixes as $prefix) {
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$module = $prefix . $original_module;
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if ($this->_classExists($module)) {
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$ok = true;
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break;
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}
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}
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if (!$ok) {
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$module = $original_module;
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if (!$this->_classExists($module)) {
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trigger_error($original_module . ' module does not exist',
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E_USER_ERROR);
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return;
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}
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}
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$module = new $module();
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}
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$this->registeredModules[$module->name] = $module;
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}
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/**
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* Safely tests for class existence without invoking __autoload in PHP5
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* or greater.
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* @param $name String class name to test
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* @note If any other class needs it, we'll need to stash in a
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* conjectured "compatibility" class
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* @private
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*/
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function _classExists($name) {
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static $is_php_4 = null;
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if ($is_php_4 === null) {
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$is_php_4 = version_compare(PHP_VERSION, '5', '<');
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}
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if ($is_php_4) {
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return class_exists($name);
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} else {
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return class_exists($name, false);
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}
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}
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/**
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* Adds a module to the current doctype by first registering it,
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* and then tacking it on to the active doctype
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*/
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function addModule($module) {
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// unimplemented
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}
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/**
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* Adds a class prefix that registerModule() will use to resolve a
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* string name to a concrete class
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*/
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function addPrefix($prefix) {
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$this->prefixes[] = $prefix;
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}
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/**
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* Performs processing on modules, after being called you may
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* use getElement() and getElements()
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* @param $config Instance of HTMLPurifier_Config
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*/
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function setup($config) {
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$this->trusted = $config->get('HTML', 'Trusted');
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// generate
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$doctype = $this->doctypes->make($config);
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$modules = $doctype->modules;
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foreach ($modules as $module) {
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if (is_object($module)) {
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$this->modules[$module->name] = $module;
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continue;
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} else {
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if (!isset($this->modules[$module])) {
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$this->registerModule($module);
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}
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$this->modules[$module] = $this->registeredModules[$module];
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}
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}
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// setup lookup table based on all valid modules
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foreach ($this->modules as $module) {
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foreach ($module->info as $name => $def) {
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if (!isset($this->elementLookup[$name])) {
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$this->elementLookup[$name] = array();
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}
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$this->elementLookup[$name][] = $module->name;
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}
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}
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// note the different choice
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$this->contentSets = new HTMLPurifier_ContentSets(
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// content set assembly deals with all possible modules,
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// not just ones deemed to be "safe"
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$this->modules
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);
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$this->attrCollections = new HTMLPurifier_AttrCollections(
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$this->attrTypes,
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// there is no way to directly disable a global attribute,
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// but using AllowedAttributes or simply not including
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// the module in your custom doctype should be sufficient
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$this->modules
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);
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}
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/**
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* Retrieves merged element definitions.
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* @param $config Instance of HTMLPurifier_Config, for determining
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* stray elements.
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* @return Array of HTMLPurifier_ElementDef
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*/
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function getElements($config) {
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$elements = array();
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foreach ($this->modules as $module) {
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foreach ($module->info as $name => $v) {
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if (isset($elements[$name])) continue;
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// if element is not safe, don't use it
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if (!$this->trusted && ($v->safe === false)) continue;
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$elements[$name] = $this->getElement($name, $config);
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}
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}
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// remove dud elements, this happens when an element that
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// appeared to be safe actually wasn't
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foreach ($elements as $n => $v) {
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if ($v === false) unset($elements[$n]);
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}
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return $elements;
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}
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/**
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* Retrieves a single merged element definition
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* @param $name Name of element
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* @param $config Instance of HTMLPurifier_Config, may not be necessary.
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* @param $trusted Boolean trusted overriding parameter: set to true
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* if you want the full version of an element
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* @return Merged HTMLPurifier_ElementDef
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*/
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function getElement($name, $config, $trusted = null) {
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$def = false;
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if ($trusted === null) $trusted = $this->trusted;
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$modules = $this->modules;
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if (!isset($this->elementLookup[$name])) {
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return false;
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}
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foreach($this->elementLookup[$name] as $module_name) {
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$module = $modules[$module_name];
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$new_def = $module->info[$name];
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// refuse to create/merge in a definition that is deemed unsafe
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if (!$trusted && ($new_def->safe === false)) {
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$def = false;
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continue;
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}
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if (!$def && $new_def->standalone) {
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// element with unknown safety is not to be trusted.
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// however, a merge-in definition with undefined safety
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// is fine
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if (!$trusted && !$new_def->safe) continue;
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$def = $new_def;
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} elseif ($def) {
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$def->mergeIn($new_def);
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} else {
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// could "save it for another day":
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// non-standalone definitions that don't have a standalone
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// to merge into could be deferred to the end
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continue;
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}
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// attribute value expansions
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$this->attrCollections->performInclusions($def->attr);
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$this->attrCollections->expandIdentifiers($def->attr, $this->attrTypes);
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// descendants_are_inline, for ChildDef_Chameleon
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if (is_string($def->content_model) &&
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strpos($def->content_model, 'Inline') !== false) {
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if ($name != 'del' && $name != 'ins') {
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// this is for you, ins/del
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$def->descendants_are_inline = true;
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}
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}
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$this->contentSets->generateChildDef($def, $module);
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}
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return $def;
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}
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}
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?>
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