mirror of
https://github.com/ezyang/htmlpurifier.git
synced 2024-11-14 09:18:41 +00:00
fac747bdbd
With minor corrections. Signed-off-by: Marcus Bointon <marcus@synchromedia.co.uk> Signed-off-by: Edward Z. Yang <ezyang@mit.edu>
494 lines
17 KiB
PHP
494 lines
17 KiB
PHP
<?php
|
|
|
|
/**
|
|
* Definition of the purified HTML that describes allowed children,
|
|
* attributes, and many other things.
|
|
*
|
|
* Conventions:
|
|
*
|
|
* All member variables that are prefixed with info
|
|
* (including the main $info array) are used by HTML Purifier internals
|
|
* and should not be directly edited when customizing the HTMLDefinition.
|
|
* They can usually be set via configuration directives or custom
|
|
* modules.
|
|
*
|
|
* On the other hand, member variables without the info prefix are used
|
|
* internally by the HTMLDefinition and MUST NOT be used by other HTML
|
|
* Purifier internals. Many of them, however, are public, and may be
|
|
* edited by userspace code to tweak the behavior of HTMLDefinition.
|
|
*
|
|
* @note This class is inspected by Printer_HTMLDefinition; please
|
|
* update that class if things here change.
|
|
*
|
|
* @warning Directives that change this object's structure must be in
|
|
* the HTML or Attr namespace!
|
|
*/
|
|
class HTMLPurifier_HTMLDefinition extends HTMLPurifier_Definition
|
|
{
|
|
|
|
// FULLY-PUBLIC VARIABLES ---------------------------------------------
|
|
|
|
/**
|
|
* Associative array of element names to HTMLPurifier_ElementDef.
|
|
* @type HTMLPurifier_ElementDef[]
|
|
*/
|
|
public $info = array();
|
|
|
|
/**
|
|
* Associative array of global attribute name to attribute definition.
|
|
* @type array
|
|
*/
|
|
public $info_global_attr = array();
|
|
|
|
/**
|
|
* String name of parent element HTML will be going into.
|
|
* @type string
|
|
*/
|
|
public $info_parent = 'div';
|
|
|
|
/**
|
|
* Definition for parent element, allows parent element to be a
|
|
* tag that's not allowed inside the HTML fragment.
|
|
* @type HTMLPurifier_ElementDef
|
|
*/
|
|
public $info_parent_def;
|
|
|
|
/**
|
|
* String name of element used to wrap inline elements in block context.
|
|
* @type string
|
|
* @note This is rarely used except for BLOCKQUOTEs in strict mode
|
|
*/
|
|
public $info_block_wrapper = 'p';
|
|
|
|
/**
|
|
* Associative array of deprecated tag name to HTMLPurifier_TagTransform.
|
|
* @type array
|
|
*/
|
|
public $info_tag_transform = array();
|
|
|
|
/**
|
|
* Indexed list of HTMLPurifier_AttrTransform to be performed before validation.
|
|
* @type HTMLPurifier_AttrTransform[]
|
|
*/
|
|
public $info_attr_transform_pre = array();
|
|
|
|
/**
|
|
* Indexed list of HTMLPurifier_AttrTransform to be performed after validation.
|
|
* @type HTMLPurifier_AttrTransform[]
|
|
*/
|
|
public $info_attr_transform_post = array();
|
|
|
|
/**
|
|
* Nested lookup array of content set name (Block, Inline) to
|
|
* element name to whether or not it belongs in that content set.
|
|
* @type array
|
|
*/
|
|
public $info_content_sets = array();
|
|
|
|
/**
|
|
* Indexed list of HTMLPurifier_Injector to be used.
|
|
* @type HTMLPurifier_Injector[]
|
|
*/
|
|
public $info_injector = array();
|
|
|
|
/**
|
|
* Doctype object
|
|
* @type HTMLPurifier_Doctype
|
|
*/
|
|
public $doctype;
|
|
|
|
|
|
|
|
// RAW CUSTOMIZATION STUFF --------------------------------------------
|
|
|
|
/**
|
|
* Adds a custom attribute to a pre-existing element
|
|
* @note This is strictly convenience, and does not have a corresponding
|
|
* method in HTMLPurifier_HTMLModule
|
|
* @param string $element_name Element name to add attribute to
|
|
* @param string $attr_name Name of attribute
|
|
* @param mixed $def Attribute definition, can be string or object, see
|
|
* HTMLPurifier_AttrTypes for details
|
|
*/
|
|
public function addAttribute($element_name, $attr_name, $def)
|
|
{
|
|
$module = $this->getAnonymousModule();
|
|
if (!isset($module->info[$element_name])) {
|
|
$element = $module->addBlankElement($element_name);
|
|
} else {
|
|
$element = $module->info[$element_name];
|
|
}
|
|
$element->attr[$attr_name] = $def;
|
|
}
|
|
|
|
/**
|
|
* Adds a custom element to your HTML definition
|
|
* @see HTMLPurifier_HTMLModule::addElement() for detailed
|
|
* parameter and return value descriptions.
|
|
*/
|
|
public function addElement($element_name, $type, $contents, $attr_collections, $attributes = array())
|
|
{
|
|
$module = $this->getAnonymousModule();
|
|
// assume that if the user is calling this, the element
|
|
// is safe. This may not be a good idea
|
|
$element = $module->addElement($element_name, $type, $contents, $attr_collections, $attributes);
|
|
return $element;
|
|
}
|
|
|
|
/**
|
|
* Adds a blank element to your HTML definition, for overriding
|
|
* existing behavior
|
|
* @param string $element_name
|
|
* @return HTMLPurifier_ElementDef
|
|
* @see HTMLPurifier_HTMLModule::addBlankElement() for detailed
|
|
* parameter and return value descriptions.
|
|
*/
|
|
public function addBlankElement($element_name)
|
|
{
|
|
$module = $this->getAnonymousModule();
|
|
$element = $module->addBlankElement($element_name);
|
|
return $element;
|
|
}
|
|
|
|
/**
|
|
* Retrieves a reference to the anonymous module, so you can
|
|
* bust out advanced features without having to make your own
|
|
* module.
|
|
* @return HTMLPurifier_HTMLModule
|
|
*/
|
|
public function getAnonymousModule()
|
|
{
|
|
if (!$this->_anonModule) {
|
|
$this->_anonModule = new HTMLPurifier_HTMLModule();
|
|
$this->_anonModule->name = 'Anonymous';
|
|
}
|
|
return $this->_anonModule;
|
|
}
|
|
|
|
private $_anonModule = null;
|
|
|
|
// PUBLIC BUT INTERNAL VARIABLES --------------------------------------
|
|
|
|
/**
|
|
* @type string
|
|
*/
|
|
public $type = 'HTML';
|
|
|
|
/**
|
|
* @type HTMLPurifier_HTMLModuleManager
|
|
*/
|
|
public $manager;
|
|
|
|
/**
|
|
* Performs low-cost, preliminary initialization.
|
|
*/
|
|
public function __construct()
|
|
{
|
|
$this->manager = new HTMLPurifier_HTMLModuleManager();
|
|
}
|
|
|
|
/**
|
|
* @param HTMLPurifier_Config $config
|
|
*/
|
|
protected function doSetup($config)
|
|
{
|
|
$this->processModules($config);
|
|
$this->setupConfigStuff($config);
|
|
unset($this->manager);
|
|
|
|
// cleanup some of the element definitions
|
|
foreach ($this->info as $k => $v) {
|
|
unset($this->info[$k]->content_model);
|
|
unset($this->info[$k]->content_model_type);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Extract out the information from the manager
|
|
* @param HTMLPurifier_Config $config
|
|
*/
|
|
protected function processModules($config)
|
|
{
|
|
if ($this->_anonModule) {
|
|
// for user specific changes
|
|
// this is late-loaded so we don't have to deal with PHP4
|
|
// reference wonky-ness
|
|
$this->manager->addModule($this->_anonModule);
|
|
unset($this->_anonModule);
|
|
}
|
|
|
|
$this->manager->setup($config);
|
|
$this->doctype = $this->manager->doctype;
|
|
|
|
foreach ($this->manager->modules as $module) {
|
|
foreach ($module->info_tag_transform as $k => $v) {
|
|
if ($v === false) {
|
|
unset($this->info_tag_transform[$k]);
|
|
} else {
|
|
$this->info_tag_transform[$k] = $v;
|
|
}
|
|
}
|
|
foreach ($module->info_attr_transform_pre as $k => $v) {
|
|
if ($v === false) {
|
|
unset($this->info_attr_transform_pre[$k]);
|
|
} else {
|
|
$this->info_attr_transform_pre[$k] = $v;
|
|
}
|
|
}
|
|
foreach ($module->info_attr_transform_post as $k => $v) {
|
|
if ($v === false) {
|
|
unset($this->info_attr_transform_post[$k]);
|
|
} else {
|
|
$this->info_attr_transform_post[$k] = $v;
|
|
}
|
|
}
|
|
foreach ($module->info_injector as $k => $v) {
|
|
if ($v === false) {
|
|
unset($this->info_injector[$k]);
|
|
} else {
|
|
$this->info_injector[$k] = $v;
|
|
}
|
|
}
|
|
}
|
|
$this->info = $this->manager->getElements();
|
|
$this->info_content_sets = $this->manager->contentSets->lookup;
|
|
}
|
|
|
|
/**
|
|
* Sets up stuff based on config. We need a better way of doing this.
|
|
* @param HTMLPurifier_Config $config
|
|
*/
|
|
protected function setupConfigStuff($config)
|
|
{
|
|
$block_wrapper = $config->get('HTML.BlockWrapper');
|
|
if (isset($this->info_content_sets['Block'][$block_wrapper])) {
|
|
$this->info_block_wrapper = $block_wrapper;
|
|
} else {
|
|
trigger_error(
|
|
'Cannot use non-block element as block wrapper',
|
|
E_USER_ERROR
|
|
);
|
|
}
|
|
|
|
$parent = $config->get('HTML.Parent');
|
|
$def = $this->manager->getElement($parent, true);
|
|
if ($def) {
|
|
$this->info_parent = $parent;
|
|
$this->info_parent_def = $def;
|
|
} else {
|
|
trigger_error(
|
|
'Cannot use unrecognized element as parent',
|
|
E_USER_ERROR
|
|
);
|
|
$this->info_parent_def = $this->manager->getElement($this->info_parent, true);
|
|
}
|
|
|
|
// support template text
|
|
$support = "(for information on implementing this, see the support forums) ";
|
|
|
|
// setup allowed elements -----------------------------------------
|
|
|
|
$allowed_elements = $config->get('HTML.AllowedElements');
|
|
$allowed_attributes = $config->get('HTML.AllowedAttributes'); // retrieve early
|
|
|
|
if (!is_array($allowed_elements) && !is_array($allowed_attributes)) {
|
|
$allowed = $config->get('HTML.Allowed');
|
|
if (is_string($allowed)) {
|
|
list($allowed_elements, $allowed_attributes) = $this->parseTinyMCEAllowedList($allowed);
|
|
}
|
|
}
|
|
|
|
if (is_array($allowed_elements)) {
|
|
foreach ($this->info as $name => $d) {
|
|
if (!isset($allowed_elements[$name])) {
|
|
unset($this->info[$name]);
|
|
}
|
|
unset($allowed_elements[$name]);
|
|
}
|
|
// emit errors
|
|
foreach ($allowed_elements as $element => $d) {
|
|
$element = htmlspecialchars($element); // PHP doesn't escape errors, be careful!
|
|
trigger_error("Element '$element' is not supported $support", E_USER_WARNING);
|
|
}
|
|
}
|
|
|
|
// setup allowed attributes ---------------------------------------
|
|
|
|
$allowed_attributes_mutable = $allowed_attributes; // by copy!
|
|
if (is_array($allowed_attributes)) {
|
|
// This actually doesn't do anything, since we went away from
|
|
// global attributes. It's possible that userland code uses
|
|
// it, but HTMLModuleManager doesn't!
|
|
foreach ($this->info_global_attr as $attr => $x) {
|
|
$keys = array($attr, "*@$attr", "*.$attr");
|
|
$delete = true;
|
|
foreach ($keys as $key) {
|
|
if ($delete && isset($allowed_attributes[$key])) {
|
|
$delete = false;
|
|
}
|
|
if (isset($allowed_attributes_mutable[$key])) {
|
|
unset($allowed_attributes_mutable[$key]);
|
|
}
|
|
}
|
|
if ($delete) {
|
|
unset($this->info_global_attr[$attr]);
|
|
}
|
|
}
|
|
|
|
foreach ($this->info as $tag => $info) {
|
|
foreach ($info->attr as $attr => $x) {
|
|
$keys = array("$tag@$attr", $attr, "*@$attr", "$tag.$attr", "*.$attr");
|
|
$delete = true;
|
|
foreach ($keys as $key) {
|
|
if ($delete && isset($allowed_attributes[$key])) {
|
|
$delete = false;
|
|
}
|
|
if (isset($allowed_attributes_mutable[$key])) {
|
|
unset($allowed_attributes_mutable[$key]);
|
|
}
|
|
}
|
|
if ($delete) {
|
|
if ($this->info[$tag]->attr[$attr]->required) {
|
|
trigger_error(
|
|
"Required attribute '$attr' in element '$tag' " .
|
|
"was not allowed, which means '$tag' will not be allowed either",
|
|
E_USER_WARNING
|
|
);
|
|
}
|
|
unset($this->info[$tag]->attr[$attr]);
|
|
}
|
|
}
|
|
}
|
|
// emit errors
|
|
foreach ($allowed_attributes_mutable as $elattr => $d) {
|
|
$bits = preg_split('/[.@]/', $elattr, 2);
|
|
$c = count($bits);
|
|
switch ($c) {
|
|
case 2:
|
|
if ($bits[0] !== '*') {
|
|
$element = htmlspecialchars($bits[0]);
|
|
$attribute = htmlspecialchars($bits[1]);
|
|
if (!isset($this->info[$element])) {
|
|
trigger_error(
|
|
"Cannot allow attribute '$attribute' if element " .
|
|
"'$element' is not allowed/supported $support"
|
|
);
|
|
} else {
|
|
trigger_error(
|
|
"Attribute '$attribute' in element '$element' not supported $support",
|
|
E_USER_WARNING
|
|
);
|
|
}
|
|
break;
|
|
}
|
|
// otherwise fall through
|
|
case 1:
|
|
$attribute = htmlspecialchars($bits[0]);
|
|
trigger_error(
|
|
"Global attribute '$attribute' is not ".
|
|
"supported in any elements $support",
|
|
E_USER_WARNING
|
|
);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
// setup forbidden elements ---------------------------------------
|
|
|
|
$forbidden_elements = $config->get('HTML.ForbiddenElements');
|
|
$forbidden_attributes = $config->get('HTML.ForbiddenAttributes');
|
|
|
|
foreach ($this->info as $tag => $info) {
|
|
if (isset($forbidden_elements[$tag])) {
|
|
unset($this->info[$tag]);
|
|
continue;
|
|
}
|
|
foreach ($info->attr as $attr => $x) {
|
|
if (isset($forbidden_attributes["$tag@$attr"]) ||
|
|
isset($forbidden_attributes["*@$attr"]) ||
|
|
isset($forbidden_attributes[$attr])
|
|
) {
|
|
unset($this->info[$tag]->attr[$attr]);
|
|
continue;
|
|
} elseif (isset($forbidden_attributes["$tag.$attr"])) { // this segment might get removed eventually
|
|
// $tag.$attr are not user supplied, so no worries!
|
|
trigger_error(
|
|
"Error with $tag.$attr: tag.attr syntax not supported for " .
|
|
"HTML.ForbiddenAttributes; use tag@attr instead",
|
|
E_USER_WARNING
|
|
);
|
|
}
|
|
}
|
|
}
|
|
foreach ($forbidden_attributes as $key => $v) {
|
|
if (strlen($key) < 2) {
|
|
continue;
|
|
}
|
|
if ($key[0] != '*') {
|
|
continue;
|
|
}
|
|
if ($key[1] == '.') {
|
|
trigger_error(
|
|
"Error with $key: *.attr syntax not supported for HTML.ForbiddenAttributes; use attr instead",
|
|
E_USER_WARNING
|
|
);
|
|
}
|
|
}
|
|
|
|
// setup injectors -----------------------------------------------------
|
|
foreach ($this->info_injector as $i => $injector) {
|
|
if ($injector->checkNeeded($config) !== false) {
|
|
// remove injector that does not have it's required
|
|
// elements/attributes present, and is thus not needed.
|
|
unset($this->info_injector[$i]);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Parses a TinyMCE-flavored Allowed Elements and Attributes list into
|
|
* separate lists for processing. Format is element[attr1|attr2],element2...
|
|
* @warning Although it's largely drawn from TinyMCE's implementation,
|
|
* it is different, and you'll probably have to modify your lists
|
|
* @param array $list String list to parse
|
|
* @return array
|
|
* @todo Give this its own class, probably static interface
|
|
*/
|
|
public function parseTinyMCEAllowedList($list)
|
|
{
|
|
$list = str_replace(array(' ', "\t"), '', $list);
|
|
|
|
$elements = array();
|
|
$attributes = array();
|
|
|
|
$chunks = preg_split('/(,|[\n\r]+)/', $list);
|
|
foreach ($chunks as $chunk) {
|
|
if (empty($chunk)) {
|
|
continue;
|
|
}
|
|
// remove TinyMCE element control characters
|
|
if (!strpos($chunk, '[')) {
|
|
$element = $chunk;
|
|
$attr = false;
|
|
} else {
|
|
list($element, $attr) = explode('[', $chunk);
|
|
}
|
|
if ($element !== '*') {
|
|
$elements[$element] = true;
|
|
}
|
|
if (!$attr) {
|
|
continue;
|
|
}
|
|
$attr = substr($attr, 0, strlen($attr) - 1); // remove trailing ]
|
|
$attr = explode('|', $attr);
|
|
foreach ($attr as $key) {
|
|
$attributes["$element.$key"] = true;
|
|
}
|
|
}
|
|
return array($elements, $attributes);
|
|
}
|
|
}
|
|
|
|
// vim: et sw=4 sts=4
|