mirror of
https://github.com/ezyang/htmlpurifier.git
synced 2024-12-22 16:31:53 +00:00
468 lines
16 KiB
PHP
468 lines
16 KiB
PHP
<?php
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class HTMLPurifier_HTMLModuleManager
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{
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/**
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* @type HTMLPurifier_DoctypeRegistry
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*/
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public $doctypes;
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/**
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* Instance of current doctype.
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* @type string
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*/
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public $doctype;
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/**
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* @type HTMLPurifier_AttrTypes
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*/
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public $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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* @type HTMLPurifier_HTMLModule[]
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*/
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public $modules = array();
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/**
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* Array of recognized HTMLPurifier_HTMLModule instances,
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* indexed by 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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* @type HTMLPurifier_HTMLModule[]
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*/
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public $registeredModules = array();
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/**
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* List of extra modules that were added by the user
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* using addModule(). These get unconditionally merged into the current doctype, whatever
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* it may be.
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* @type HTMLPurifier_HTMLModule[]
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*/
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public $userModules = 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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* @type array
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*/
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public $elementLookup = array();
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/**
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* List of prefixes we should use for registering small names.
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* @type array
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*/
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public $prefixes = array('HTMLPurifier_HTMLModule_');
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/**
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* @type HTMLPurifier_ContentSets
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*/
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public $contentSets;
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/**
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* @type HTMLPurifier_AttrCollections
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*/
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public $attrCollections;
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/**
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* If set to true, unsafe elements and attributes will be allowed.
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* @type bool
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*/
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public $trusted = false;
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public function __construct()
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{
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// editable internal objects
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$this->attrTypes = new HTMLPurifier_AttrTypes();
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$this->doctypes = new HTMLPurifier_DoctypeRegistry();
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// setup basic modules
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$common = array(
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'CommonAttributes', 'Text', 'Hypertext', 'List',
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'Presentation', 'Edit', 'Bdo', 'Tables', 'Image',
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'StyleAttribute',
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// Unsafe:
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'Scripting', 'Object', 'Forms',
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// Sorta legacy, but present in strict:
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'Name',
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);
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$transitional = array('Legacy', 'Target', 'Iframe');
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$xml = array('XMLCommonAttributes');
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$non_xml = array('NonXMLCommonAttributes');
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// setup basic doctypes
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$this->doctypes->register(
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'HTML 4.01 Transitional',
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false,
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array_merge($common, $transitional, $non_xml),
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array('Tidy_Transitional', 'Tidy_Proprietary'),
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array(),
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'-//W3C//DTD HTML 4.01 Transitional//EN',
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'http://www.w3.org/TR/html4/loose.dtd'
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);
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$this->doctypes->register(
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'HTML 4.01 Strict',
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false,
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array_merge($common, $non_xml),
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array('Tidy_Strict', 'Tidy_Proprietary', 'Tidy_Name'),
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array(),
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'-//W3C//DTD HTML 4.01//EN',
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'http://www.w3.org/TR/html4/strict.dtd'
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);
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$this->doctypes->register(
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'XHTML 1.0 Transitional',
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true,
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array_merge($common, $transitional, $xml, $non_xml),
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array('Tidy_Transitional', 'Tidy_XHTML', 'Tidy_Proprietary', 'Tidy_Name'),
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array(),
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'-//W3C//DTD XHTML 1.0 Transitional//EN',
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'http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd'
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);
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$this->doctypes->register(
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'XHTML 1.0 Strict',
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true,
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array_merge($common, $xml, $non_xml),
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array('Tidy_Strict', 'Tidy_XHTML', 'Tidy_Strict', 'Tidy_Proprietary', 'Tidy_Name'),
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array(),
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'-//W3C//DTD XHTML 1.0 Strict//EN',
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'http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd'
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);
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$this->doctypes->register(
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'XHTML 1.1',
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true,
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// Iframe is a real XHTML 1.1 module, despite being
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// "transitional"!
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array_merge($common, $xml, array('Ruby', 'Iframe')),
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array('Tidy_Strict', 'Tidy_XHTML', 'Tidy_Proprietary', 'Tidy_Strict', 'Tidy_Name'), // Tidy_XHTML1_1
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array(),
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'-//W3C//DTD XHTML 1.1//EN',
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'http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd'
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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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* @param $overload Boolean whether or not to overload previous modules.
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* If this is not set, and you do overload a module,
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* HTML Purifier will complain with a warning.
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* @note This function will not call autoload, you must instantiate
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* (and thus invoke) autoload outside the method.
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* @note If a string is passed as a module name, different variants
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* will be tested in this order:
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* - Check for HTMLPurifier_HTMLModule_$name
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* - Check all prefixes with $name in order they were added
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* - Check for literal object name
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* - Throw fatal error
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* If your object name collides with an internal class, specify
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* your module manually. All modules must have been included
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* externally: registerModule will not perform inclusions for you!
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*/
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public function registerModule($module, $overload = false)
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{
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if (is_string($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 . $original_module;
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if (class_exists($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 = $original_module;
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if (!class_exists($module)) {
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trigger_error(
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$original_module . ' module does not exist',
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E_USER_ERROR
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);
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return;
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}
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}
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$module = new $module();
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}
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if (empty($module->name)) {
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trigger_error('Module instance of ' . get_class($module) . ' must have name');
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return;
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}
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if (!$overload && isset($this->registeredModules[$module->name])) {
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trigger_error('Overloading ' . $module->name . ' without explicit overload parameter', E_USER_WARNING);
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}
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$this->registeredModules[$module->name] = $module;
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}
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/**
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* Adds a module to the current doctype by first registering it,
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* and then tacking it on to the active doctype
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*/
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public function addModule($module)
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{
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$this->registerModule($module);
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if (is_object($module)) {
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$module = $module->name;
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}
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$this->userModules[] = $module;
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}
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/**
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* Adds a class prefix that registerModule() will use to resolve a
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* string name to a concrete class
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*/
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public function addPrefix($prefix)
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{
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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 HTMLPurifier_Config $config
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*/
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public function setup($config)
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{
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$this->trusted = $config->get('HTML.Trusted');
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// generate
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$this->doctype = $this->doctypes->make($config);
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$modules = $this->doctype->modules;
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// take out the default modules that aren't allowed
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$lookup = $config->get('HTML.AllowedModules');
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$special_cases = $config->get('HTML.CoreModules');
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if (is_array($lookup)) {
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foreach ($modules as $k => $m) {
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if (isset($special_cases[$m])) {
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continue;
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}
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if (!isset($lookup[$m])) {
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unset($modules[$k]);
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}
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}
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}
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// custom modules
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if ($config->get('HTML.Proprietary')) {
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$modules[] = 'Proprietary';
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}
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if ($config->get('HTML.SafeObject')) {
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$modules[] = 'SafeObject';
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}
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if ($config->get('HTML.SafeEmbed')) {
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$modules[] = 'SafeEmbed';
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}
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if ($config->get('HTML.SafeScripting') !== array()) {
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$modules[] = 'SafeScripting';
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}
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if ($config->get('HTML.Nofollow')) {
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$modules[] = 'Nofollow';
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}
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if ($config->get('HTML.TargetBlank')) {
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$modules[] = 'TargetBlank';
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}
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// NB: HTML.TargetNoreferrer and HTML.TargetNoopener must be AFTER HTML.TargetBlank
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// so that its post-attr-transform gets run afterwards.
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if ($config->get('HTML.TargetNoreferrer')) {
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$modules[] = 'TargetNoreferrer';
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}
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if ($config->get('HTML.TargetNoopener')) {
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$modules[] = 'TargetNoopener';
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}
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// merge in custom modules
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$modules = array_merge($modules, $this->userModules);
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foreach ($modules as $module) {
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$this->processModule($module);
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$this->modules[$module]->setup($config);
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}
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foreach ($this->doctype->tidyModules as $module) {
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$this->processModule($module);
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$this->modules[$module]->setup($config);
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}
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// prepare any injectors
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foreach ($this->modules as $module) {
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$n = array();
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foreach ($module->info_injector as $injector) {
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if (!is_object($injector)) {
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$class = "HTMLPurifier_Injector_$injector";
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$injector = new $class;
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}
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$n[$injector->name] = $injector;
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}
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$module->info_injector = $n;
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}
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// setup lookup table based on all valid modules
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foreach ($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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* Takes a module and adds it to the active module collection,
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* registering it if necessary.
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*/
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public function processModule($module)
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{
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if (!isset($this->registeredModules[$module]) || is_object($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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* Retrieves merged element definitions.
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* @return Array of HTMLPurifier_ElementDef
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*/
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public function getElements()
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{
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$elements = array();
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foreach ($this->modules as $module) {
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if (!$this->trusted && !$module->safe) {
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continue;
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}
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foreach ($module->info as $name => $v) {
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if (isset($elements[$name])) {
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continue;
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}
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$elements[$name] = $this->getElement($name);
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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) {
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unset($elements[$n]);
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}
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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 string $name Name of element
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* @param bool $trusted Boolean trusted overriding parameter: set to true
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* if you want the full version of an element
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* @return HTMLPurifier_ElementDef Merged HTMLPurifier_ElementDef
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* @note You may notice that modules are getting iterated over twice (once
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* in getElements() and once here). This
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* is because
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*/
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public function getElement($name, $trusted = null)
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{
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if (!isset($this->elementLookup[$name])) {
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return false;
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}
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// setup global state variables
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$def = false;
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if ($trusted === null) {
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$trusted = $this->trusted;
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}
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// iterate through each module that has registered itself to this
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// element
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foreach ($this->elementLookup[$name] as $module_name) {
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$module = $this->modules[$module_name];
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// refuse to create/merge from a module that is deemed unsafe--
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// pretend the module doesn't exist--when trusted mode is not on.
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if (!$trusted && !$module->safe) {
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continue;
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}
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// clone is used because, ideally speaking, the original
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// definition should not be modified. Usually, this will
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// make no difference, but for consistency's sake
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$new_def = clone $module->info[$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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// This will occur even if $new_def is standalone. In practice,
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// this will usually result in a full replacement.
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$def->mergeIn($new_def);
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} else {
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// :TODO:
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// non-standalone definitions that don't have a standalone
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// to merge into could be deferred to the end
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// HOWEVER, it is perfectly valid for a non-standalone
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// definition to lack a standalone definition, even
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// after all processing: this allows us to safely
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// specify extra attributes for elements that may not be
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// enabled all in one place. In particular, this might
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// be the case for trusted elements. WARNING: care must
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// be taken that the /extra/ definitions are all safe.
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continue;
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}
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// attribute value expansions
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$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, $module);
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}
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// This can occur if there is a blank definition, but no base to
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// mix it in with
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if (!$def) {
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return false;
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}
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// add information on required attributes
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foreach ($def->attr as $attr_name => $attr_def) {
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if ($attr_def->required) {
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$def->required_attr[] = $attr_name;
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}
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}
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return $def;
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}
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}
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// vim: et sw=4 sts=4
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