mirror of
https://github.com/ezyang/htmlpurifier.git
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0d0173eb6e
git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@760 48356398-32a2-884e-a903-53898d9a118a
463 lines
17 KiB
PHP
463 lines
17 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/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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// 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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class HTMLPurifier_HTMLModuleManager
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{
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/**
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* Array of HTMLPurifier_Module instances, indexed by module's class name.
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* All known modules, regardless of use, are in this array.
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*/
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var $modules = array();
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/**
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* Modules that may be used in a valid doctype of this kind.
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* Correctional and leniency modules should not be placed in this
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* array unless the user said so: don't stuff every possible lenient
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* module for this doctype in here.
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*/
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var $validModules = array();
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/**
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* Collections that should be merged into $validModules
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*/
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var $validModulesCollections = array('Safe', 'Unsafe', 'Lenient', 'Correctional');
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/**
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* Modules that we will use broadly, subset of $validModules. Single
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* element definitions may result in us consulting validModules.
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*/
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var $activeModules = array();
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/**
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* Collections that should be merged into $activeModules
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*/
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var $activeModulesCollections = array('Safe', 'Lenient', 'Correctional');
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/**
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* Current doctype for which $validModules is based
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*/
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var $doctype;
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/**
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* Designates next available integer order for modules.
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*/
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var $moduleCounter = 0;
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/**
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* List of suffixes of collections to process
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*/
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var $collections = array('Safe', 'Unsafe', 'Lenient', 'Correctional');
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/**
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* Associative array of module setup names to the corresponding safe
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* (as in no XSS, no full document markup) modules. These are
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* included in both valid and active module lists by default.
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*/
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var $collectionsSafe = array(
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'_Common' => array( // leading _ indicates private
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'CommonAttributes', 'Text', 'Hypertext', 'List',
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'Presentation', 'Edit', 'Bdo', 'Tables', 'Image',
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'StyleAttribute'
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),
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// HTML definitions, defer completely to XHTML definitions
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'HTML 4.01 Transitional' => 'XHTML 1.0 Transitional',
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'HTML 4.01 Strict' => 'XHTML 1.0 Strict',
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// XHTML definitions
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'XHTML 1.0 Transitional' => array( array('XHTML 1.0 Strict'), 'Legacy' ),
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'XHTML 1.0 Strict' => array(array('_Common')),
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'XHTML 1.1' => array(array('_Common')),
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);
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/**
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* Modules that specify elements that are unsafe from untrusted
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* third-parties. These should be registered in $validModules but
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* almost never $activeModules unless you really know what you're
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* doing.
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*/
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var $collectionsUnsafe = array( );
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/**
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* Modules to import if lenient mode (attempt to convert everything
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* to a valid representation) is on. These must not be in $activeModules
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* unless specified so.
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*/
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var $collectionsLenient = array(
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'HTML 4.01 Strict' => 'XHTML 1.0 Strict',
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'XHTML 1.0 Strict' => array('TransformToStrict'),
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'XHTML 1.1' => array(array('XHTML 1.0 Strict'), 'TransformToXHTML11')
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);
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/**
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* Modules to import if correctional mode (correct everything that
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* is feasible to strict mode) is on. These must not be in $activeModules
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* unless specified so.
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*/
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var $collectionsCorrectional = array(
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'HTML 4.01 Transitional' => 'XHTML 1.0 Transitional',
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'XHTML 1.0 Transitional' => array('TransformToStrict'), // probably want a different one
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);
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/** Associative array of element name to defining modules (always array) */
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var $elementModuleLookup = array();
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/** List of prefixes we should use for resolving 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 $attrTypes; /**< Instance of HTMLPurifier_AttrTypes */
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var $attrCollections; /**< Instance of HTMLPurifier_AttrCollections */
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function HTMLPurifier_HTMLModuleManager() {
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// modules
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$modules = array(
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// define
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'CommonAttributes',
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'Text', 'Hypertext', 'List', 'Presentation',
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'Edit', 'Bdo', 'Tables', 'Image', 'StyleAttribute',
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// define-redefine
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'Legacy',
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// redefine
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'TransformToStrict', 'TransformToXHTML11'
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);
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foreach ($modules as $module) {
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$this->addModule($module);
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}
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// the only editable internal object. The rest need to
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// be manipulated through modules
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$this->attrTypes = new HTMLPurifier_AttrTypes();
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}
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/**
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* Adds a module to the ordered list.
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* @param $module Mixed: string module name, with or without
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* HTMLPurifier_HTMLModule prefix, or instance of
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* subclass of HTMLPurifier_HTMLModule.
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*/
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function addModule($module) {
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if (is_string($module)) {
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$original_module = $module;
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if (!class_exists($module)) {
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foreach ($this->prefixes as $prefix) {
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$module = $prefix . $original_module;
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if (class_exists($module)) break;
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}
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}
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if (!class_exists($module)) {
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trigger_error($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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$module = new $module();
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}
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$module->order = $this->moduleCounter++; // assign then increment
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$this->modules[$module->name] = $module;
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}
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/**
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* Adds a class prefix that addModule() will use to resolve a
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* string name to a concrete class
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*/
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function addPrefix($prefix) {
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$this->prefixes[] = (string) $prefix;
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}
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function setup($config) {
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// retrieve the doctype
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$this->doctype = $this->getDoctype($config);
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// process module collections to module name => module instance form
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foreach ($this->collections as $suffix) {
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$varname = 'collections' . $suffix;
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$this->processCollections($this->$varname);
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}
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$this->validModules = $this->assembleModules($this->validModulesCollections);
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$this->activeModules = $this->assembleModules($this->activeModulesCollections);
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// setup lookup table based on all valid modules
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foreach ($this->validModules as $module) {
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foreach ($module->elements as $name) {
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if (!isset($this->elementModuleLookup[$name])) {
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$this->elementModuleLookup[$name] = array();
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}
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$this->elementModuleLookup[$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 models that contain non-allowed elements are
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// harmless because RemoveForeignElements will ensure
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// they never get in anyway, and there is usually no
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// reason why you should want to restrict a content
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// model beyond what is mandated by the doctype.
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// Note, however, that this means redefinitions of
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// content models can't be tossed in validModels willy-nilly:
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// that stuff still is regulated by configuration.
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$this->validModules
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);
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$this->attrCollections = new HTMLPurifier_AttrCollections(
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$this->attrTypes,
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// only explicitly allowed modules are allowed to affect
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// the global attribute collections. This mean's there's
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// a distinction between loading the Bdo module, and the
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// bdo element: Bdo will enable the dir attribute on all
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// elements, while bdo will only define the bdo element,
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// which will not have an editable directionality. This might
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// catch people who are loading only elements by surprise, so
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// we should consider loading an entire module if all the
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// elements it defines are requested by the user, especially
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// if it affects the global attribute collections.
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$this->activeModules
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);
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}
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/**
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* Takes a list of collections and merges together all the defined
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* modules for the current doctype from those collections.
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* @param $collections List of collection suffixes we should grab
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* modules from (like 'Safe' or 'Lenient')
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*/
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function assembleModules($collections) {
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$modules = array();
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foreach ($collections as $suffix) {
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$varname = 'collections' . $suffix;
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$cols = $this->$varname;
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if (!empty($cols[$this->doctype])) {
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$modules += $cols[$this->doctype];
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}
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}
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return $modules;
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}
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/**
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* Takes a collection and performs inclusions and substitutions for it.
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* @param $cols Reference to collections class member variable
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*/
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function processCollections(&$cols) {
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// $cols is the set of collections
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// $col_i is the name (index) of a collection
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// $col is a collection/list of modules
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// perform inclusions
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foreach ($cols as $col_i => $col) {
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if (is_string($col)) continue; // alias, save for later
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if (empty($col[0]) || !is_array($col[0])) continue; // no inclusions to do
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$seen = array($col_i => true); // recursion reporting
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$includes = $col[0];
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unset($cols[$col_i][0]); // remove inclusions value, recursion guard
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for ($i = 0; isset($includes[$i]); $i++) {
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$inc = $includes[$i];
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if (isset($seen[$inc])) {
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trigger_error(
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"Circular inclusion detected in $col_i collection",
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E_USER_ERROR
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);
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continue;
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} else {
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$seen[$inc] = true;
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}
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if (!isset($cols[$inc])) {
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trigger_error(
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"Collection $col_i tried to include undefined ".
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"collection $inc", E_USER_ERROR);
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continue;
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}
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foreach ($cols[$inc] as $module) {
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if (is_array($module)) { // another inclusion!
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foreach ($module as $inc2) $includes[] = $inc2;
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continue;
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}
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$cols[$col_i][] = $module; // merge in the other modules
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}
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}
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}
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// replace with real modules, invert module from list to
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// assoc array of module name to module instance
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foreach ($cols as $col_i => $col) {
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if (is_string($col)) continue;
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$order = array();
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foreach ($col as $module_i => $module) {
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unset($cols[$col_i][$module_i]);
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if (is_array($module)) {
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trigger_error("Illegal inclusion array at index".
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" $module_i found collection $col_i, inclusion".
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" arrays must be at start of collection (index 0)",
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E_USER_ERROR);
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continue;
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}
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if (!isset($this->modules[$module])) {
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trigger_error(
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"Collection $col_i references undefined ".
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"module $module",
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E_USER_ERROR
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);
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continue;
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}
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$module = $this->modules[$module];
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$cols[$col_i][$module->name] = $module;
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$order[$module->name] = $module->order;
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}
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array_multisort(
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$order, SORT_ASC, SORT_NUMERIC, $cols[$col_i]
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);
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}
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// hook up aliases
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foreach ($cols as $col_i => $col) {
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if (!is_string($col)) continue;
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if (!isset($cols[$col])) {
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trigger_error(
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"$col_i collection is alias to undefined $col collection",
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E_USER_ERROR
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);
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unset($cols[$col_i]);
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continue;
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}
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// recursion guard
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if (is_string($cols[$col])) {
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trigger_error(
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"Cannot alias $col_i collection to alias",
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E_USER_ERROR
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);
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unset($cols[$col_i]);
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continue;
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}
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$cols[$col_i] = $cols[$col];
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}
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// delete pseudo-collections
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foreach ($cols as $col_i => $col) {
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if ($col_i[0] == '_') unset($cols[$col_i]);
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}
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}
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/**
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* Retrieves the doctype from the configuration object
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*/
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function getDoctype($config) {
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if ($config->get('Core', 'XHTML')) {
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$doctype = 'XHTML 1.0';
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} else {
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$doctype = 'HTML 4.01';
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}
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if ($config->get('HTML', 'Strict')) {
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$doctype .= ' Strict';
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} else {
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$doctype .= ' Transitional';
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}
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return $doctype;
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}
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/**
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* Retrieves merged element definitions for all active elements.
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* @note We may want to generate an elements array during setup
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* and pass that on, because a specific combination of
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* elements may trigger the loading of a module.
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* @param $config Instance of HTMLPurifier_Config, for determining
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* stray elements.
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*/
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function getElements($config) {
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$elements = array();
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foreach ($this->activeModules as $module) {
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foreach ($module->elements as $name) {
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$elements[$name] = $this->getElement($name, $config);
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}
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}
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// standalone elements now loaded
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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 $config Instance of HTMLPurifier_Config, may not be necessary.
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*/
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function getElement($name, $config) {
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$def = false;
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$modules = $this->validModules;
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if (!isset($this->elementModuleLookup[$name])) {
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return false;
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}
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foreach($this->elementModuleLookup[$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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if (!$def && $new_def->standalone) {
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$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 have save it for another day functionality:
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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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