mirror of
https://github.com/renbaoshuo/S2OJ.git
synced 2024-09-20 13:15:19 +00:00
96d4a3ecf7
Due to historical reasons, the code is in subfolder "1". With SVN removal, we place the code back and remove the annoying "1" folder.
494 lines
17 KiB
PHP
494 lines
17 KiB
PHP
<?php
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/**
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* Definition of the purified HTML that describes allowed children,
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* attributes, and many other things.
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*
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* Conventions:
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*
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* All member variables that are prefixed with info
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* (including the main $info array) are used by HTML Purifier internals
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* and should not be directly edited when customizing the HTMLDefinition.
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* They can usually be set via configuration directives or custom
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* modules.
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*
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* On the other hand, member variables without the info prefix are used
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* internally by the HTMLDefinition and MUST NOT be used by other HTML
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* Purifier internals. Many of them, however, are public, and may be
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* edited by userspace code to tweak the behavior of HTMLDefinition.
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*
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* @note This class is inspected by Printer_HTMLDefinition; please
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* update that class if things here change.
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*
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* @warning Directives that change this object's structure must be in
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* the HTML or Attr namespace!
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*/
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class HTMLPurifier_HTMLDefinition extends HTMLPurifier_Definition
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{
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// FULLY-PUBLIC VARIABLES ---------------------------------------------
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/**
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* Associative array of element names to HTMLPurifier_ElementDef.
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* @type HTMLPurifier_ElementDef[]
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*/
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public $info = array();
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/**
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* Associative array of global attribute name to attribute definition.
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* @type array
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*/
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public $info_global_attr = array();
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/**
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* String name of parent element HTML will be going into.
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* @type string
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*/
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public $info_parent = 'div';
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/**
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* Definition for parent element, allows parent element to be a
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* tag that's not allowed inside the HTML fragment.
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* @type HTMLPurifier_ElementDef
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*/
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public $info_parent_def;
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/**
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* String name of element used to wrap inline elements in block context.
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* @type string
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* @note This is rarely used except for BLOCKQUOTEs in strict mode
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*/
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public $info_block_wrapper = 'p';
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/**
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* Associative array of deprecated tag name to HTMLPurifier_TagTransform.
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* @type array
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*/
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public $info_tag_transform = array();
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/**
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* Indexed list of HTMLPurifier_AttrTransform to be performed before validation.
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* @type HTMLPurifier_AttrTransform[]
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*/
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public $info_attr_transform_pre = array();
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/**
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* Indexed list of HTMLPurifier_AttrTransform to be performed after validation.
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* @type HTMLPurifier_AttrTransform[]
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*/
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public $info_attr_transform_post = array();
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/**
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* Nested lookup array of content set name (Block, Inline) to
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* element name to whether or not it belongs in that content set.
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* @type array
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*/
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public $info_content_sets = array();
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/**
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* Indexed list of HTMLPurifier_Injector to be used.
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* @type HTMLPurifier_Injector[]
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*/
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public $info_injector = array();
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/**
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* Doctype object
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* @type HTMLPurifier_Doctype
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*/
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public $doctype;
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// RAW CUSTOMIZATION STUFF --------------------------------------------
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/**
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* Adds a custom attribute to a pre-existing element
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* @note This is strictly convenience, and does not have a corresponding
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* method in HTMLPurifier_HTMLModule
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* @param string $element_name Element name to add attribute to
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* @param string $attr_name Name of attribute
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* @param mixed $def Attribute definition, can be string or object, see
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* HTMLPurifier_AttrTypes for details
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*/
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public function addAttribute($element_name, $attr_name, $def)
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{
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$module = $this->getAnonymousModule();
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if (!isset($module->info[$element_name])) {
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$element = $module->addBlankElement($element_name);
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} else {
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$element = $module->info[$element_name];
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}
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$element->attr[$attr_name] = $def;
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}
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/**
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* Adds a custom element to your HTML definition
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* @see HTMLPurifier_HTMLModule::addElement() for detailed
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* parameter and return value descriptions.
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*/
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public function addElement($element_name, $type, $contents, $attr_collections, $attributes = array())
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{
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$module = $this->getAnonymousModule();
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// assume that if the user is calling this, the element
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// is safe. This may not be a good idea
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$element = $module->addElement($element_name, $type, $contents, $attr_collections, $attributes);
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return $element;
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}
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/**
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* Adds a blank element to your HTML definition, for overriding
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* existing behavior
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* @param string $element_name
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* @return HTMLPurifier_ElementDef
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* @see HTMLPurifier_HTMLModule::addBlankElement() for detailed
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* parameter and return value descriptions.
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*/
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public function addBlankElement($element_name)
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{
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$module = $this->getAnonymousModule();
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$element = $module->addBlankElement($element_name);
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return $element;
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}
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/**
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* Retrieves a reference to the anonymous module, so you can
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* bust out advanced features without having to make your own
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* module.
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* @return HTMLPurifier_HTMLModule
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*/
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public function getAnonymousModule()
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{
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if (!$this->_anonModule) {
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$this->_anonModule = new HTMLPurifier_HTMLModule();
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$this->_anonModule->name = 'Anonymous';
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}
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return $this->_anonModule;
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}
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private $_anonModule = null;
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// PUBLIC BUT INTERNAL VARIABLES --------------------------------------
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/**
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* @type string
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*/
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public $type = 'HTML';
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/**
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* @type HTMLPurifier_HTMLModuleManager
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*/
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public $manager;
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/**
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* Performs low-cost, preliminary initialization.
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*/
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public function __construct()
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{
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$this->manager = new HTMLPurifier_HTMLModuleManager();
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}
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/**
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* @param HTMLPurifier_Config $config
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*/
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protected function doSetup($config)
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{
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$this->processModules($config);
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$this->setupConfigStuff($config);
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unset($this->manager);
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// cleanup some of the element definitions
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foreach ($this->info as $k => $v) {
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unset($this->info[$k]->content_model);
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unset($this->info[$k]->content_model_type);
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}
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}
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/**
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* Extract out the information from the manager
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* @param HTMLPurifier_Config $config
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*/
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protected function processModules($config)
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{
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if ($this->_anonModule) {
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// for user specific changes
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// this is late-loaded so we don't have to deal with PHP4
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// reference wonky-ness
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$this->manager->addModule($this->_anonModule);
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unset($this->_anonModule);
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}
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$this->manager->setup($config);
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$this->doctype = $this->manager->doctype;
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foreach ($this->manager->modules as $module) {
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foreach ($module->info_tag_transform as $k => $v) {
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if ($v === false) {
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unset($this->info_tag_transform[$k]);
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} else {
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$this->info_tag_transform[$k] = $v;
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}
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}
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foreach ($module->info_attr_transform_pre as $k => $v) {
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if ($v === false) {
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unset($this->info_attr_transform_pre[$k]);
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} else {
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$this->info_attr_transform_pre[$k] = $v;
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}
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}
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foreach ($module->info_attr_transform_post as $k => $v) {
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if ($v === false) {
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unset($this->info_attr_transform_post[$k]);
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} else {
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$this->info_attr_transform_post[$k] = $v;
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}
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}
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foreach ($module->info_injector as $k => $v) {
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if ($v === false) {
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unset($this->info_injector[$k]);
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} else {
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$this->info_injector[$k] = $v;
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}
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}
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}
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$this->info = $this->manager->getElements();
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$this->info_content_sets = $this->manager->contentSets->lookup;
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}
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/**
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* Sets up stuff based on config. We need a better way of doing this.
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* @param HTMLPurifier_Config $config
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*/
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protected function setupConfigStuff($config)
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{
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$block_wrapper = $config->get('HTML.BlockWrapper');
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if (isset($this->info_content_sets['Block'][$block_wrapper])) {
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$this->info_block_wrapper = $block_wrapper;
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} else {
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trigger_error(
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'Cannot use non-block element as block wrapper',
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E_USER_ERROR
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);
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}
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$parent = $config->get('HTML.Parent');
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$def = $this->manager->getElement($parent, true);
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if ($def) {
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$this->info_parent = $parent;
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$this->info_parent_def = $def;
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} else {
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trigger_error(
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'Cannot use unrecognized element as parent',
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E_USER_ERROR
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);
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$this->info_parent_def = $this->manager->getElement($this->info_parent, true);
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}
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// support template text
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$support = "(for information on implementing this, see the support forums) ";
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// setup allowed elements -----------------------------------------
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$allowed_elements = $config->get('HTML.AllowedElements');
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$allowed_attributes = $config->get('HTML.AllowedAttributes'); // retrieve early
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if (!is_array($allowed_elements) && !is_array($allowed_attributes)) {
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$allowed = $config->get('HTML.Allowed');
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if (is_string($allowed)) {
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list($allowed_elements, $allowed_attributes) = $this->parseTinyMCEAllowedList($allowed);
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}
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}
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if (is_array($allowed_elements)) {
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foreach ($this->info as $name => $d) {
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if (!isset($allowed_elements[$name])) {
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unset($this->info[$name]);
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}
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unset($allowed_elements[$name]);
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}
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// emit errors
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foreach ($allowed_elements as $element => $d) {
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$element = htmlspecialchars($element); // PHP doesn't escape errors, be careful!
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trigger_error("Element '$element' is not supported $support", E_USER_WARNING);
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}
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}
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// setup allowed attributes ---------------------------------------
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$allowed_attributes_mutable = $allowed_attributes; // by copy!
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if (is_array($allowed_attributes)) {
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// This actually doesn't do anything, since we went away from
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// global attributes. It's possible that userland code uses
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// it, but HTMLModuleManager doesn't!
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foreach ($this->info_global_attr as $attr => $x) {
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$keys = array($attr, "*@$attr", "*.$attr");
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$delete = true;
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foreach ($keys as $key) {
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if ($delete && isset($allowed_attributes[$key])) {
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$delete = false;
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}
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if (isset($allowed_attributes_mutable[$key])) {
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unset($allowed_attributes_mutable[$key]);
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}
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}
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if ($delete) {
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unset($this->info_global_attr[$attr]);
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}
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}
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foreach ($this->info as $tag => $info) {
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foreach ($info->attr as $attr => $x) {
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$keys = array("$tag@$attr", $attr, "*@$attr", "$tag.$attr", "*.$attr");
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$delete = true;
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foreach ($keys as $key) {
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if ($delete && isset($allowed_attributes[$key])) {
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$delete = false;
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}
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if (isset($allowed_attributes_mutable[$key])) {
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unset($allowed_attributes_mutable[$key]);
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}
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}
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if ($delete) {
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if ($this->info[$tag]->attr[$attr]->required) {
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trigger_error(
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"Required attribute '$attr' in element '$tag' " .
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"was not allowed, which means '$tag' will not be allowed either",
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E_USER_WARNING
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);
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}
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unset($this->info[$tag]->attr[$attr]);
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}
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}
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}
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// emit errors
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foreach ($allowed_attributes_mutable as $elattr => $d) {
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$bits = preg_split('/[.@]/', $elattr, 2);
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$c = count($bits);
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switch ($c) {
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case 2:
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if ($bits[0] !== '*') {
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$element = htmlspecialchars($bits[0]);
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$attribute = htmlspecialchars($bits[1]);
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if (!isset($this->info[$element])) {
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trigger_error(
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"Cannot allow attribute '$attribute' if element " .
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"'$element' is not allowed/supported $support"
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);
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} else {
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trigger_error(
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"Attribute '$attribute' in element '$element' not supported $support",
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E_USER_WARNING
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);
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}
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break;
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}
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// otherwise fall through
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case 1:
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$attribute = htmlspecialchars($bits[0]);
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trigger_error(
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"Global attribute '$attribute' is not ".
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"supported in any elements $support",
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E_USER_WARNING
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);
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break;
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}
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}
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}
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// setup forbidden elements ---------------------------------------
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$forbidden_elements = $config->get('HTML.ForbiddenElements');
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$forbidden_attributes = $config->get('HTML.ForbiddenAttributes');
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foreach ($this->info as $tag => $info) {
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if (isset($forbidden_elements[$tag])) {
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unset($this->info[$tag]);
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continue;
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}
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foreach ($info->attr as $attr => $x) {
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if (isset($forbidden_attributes["$tag@$attr"]) ||
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isset($forbidden_attributes["*@$attr"]) ||
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isset($forbidden_attributes[$attr])
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) {
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unset($this->info[$tag]->attr[$attr]);
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continue;
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} elseif (isset($forbidden_attributes["$tag.$attr"])) { // this segment might get removed eventually
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// $tag.$attr are not user supplied, so no worries!
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trigger_error(
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"Error with $tag.$attr: tag.attr syntax not supported for " .
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"HTML.ForbiddenAttributes; use tag@attr instead",
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E_USER_WARNING
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);
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}
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}
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}
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foreach ($forbidden_attributes as $key => $v) {
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if (strlen($key) < 2) {
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continue;
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}
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if ($key[0] != '*') {
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continue;
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}
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if ($key[1] == '.') {
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trigger_error(
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"Error with $key: *.attr syntax not supported for HTML.ForbiddenAttributes; use attr instead",
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E_USER_WARNING
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);
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}
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}
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// setup injectors -----------------------------------------------------
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foreach ($this->info_injector as $i => $injector) {
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if ($injector->checkNeeded($config) !== false) {
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// remove injector that does not have it's required
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// elements/attributes present, and is thus not needed.
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unset($this->info_injector[$i]);
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}
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}
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}
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/**
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* Parses a TinyMCE-flavored Allowed Elements and Attributes list into
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* separate lists for processing. Format is element[attr1|attr2],element2...
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* @warning Although it's largely drawn from TinyMCE's implementation,
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* it is different, and you'll probably have to modify your lists
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* @param array $list String list to parse
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* @return array
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* @todo Give this its own class, probably static interface
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*/
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public function parseTinyMCEAllowedList($list)
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{
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$list = str_replace(array(' ', "\t"), '', $list);
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$elements = array();
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$attributes = array();
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$chunks = preg_split('/(,|[\n\r]+)/', $list);
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foreach ($chunks as $chunk) {
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if (empty($chunk)) {
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continue;
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}
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// remove TinyMCE element control characters
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if (!strpos($chunk, '[')) {
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$element = $chunk;
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$attr = false;
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} else {
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list($element, $attr) = explode('[', $chunk);
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}
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if ($element !== '*') {
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$elements[$element] = true;
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}
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if (!$attr) {
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continue;
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}
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$attr = substr($attr, 0, strlen($attr) - 1); // remove trailing ]
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$attr = explode('|', $attr);
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foreach ($attr as $key) {
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$attributes["$element.$key"] = true;
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}
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}
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return array($elements, $attributes);
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}
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}
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// vim: et sw=4 sts=4
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