mirror of
https://github.com/renbaoshuo/S2OJ.git
synced 2024-11-10 10:38:43 +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.
293 lines
9.8 KiB
PHP
293 lines
9.8 KiB
PHP
<?php
|
|
|
|
/*! @mainpage
|
|
*
|
|
* HTML Purifier is an HTML filter that will take an arbitrary snippet of
|
|
* HTML and rigorously test, validate and filter it into a version that
|
|
* is safe for output onto webpages. It achieves this by:
|
|
*
|
|
* -# Lexing (parsing into tokens) the document,
|
|
* -# Executing various strategies on the tokens:
|
|
* -# Removing all elements not in the whitelist,
|
|
* -# Making the tokens well-formed,
|
|
* -# Fixing the nesting of the nodes, and
|
|
* -# Validating attributes of the nodes; and
|
|
* -# Generating HTML from the purified tokens.
|
|
*
|
|
* However, most users will only need to interface with the HTMLPurifier
|
|
* and HTMLPurifier_Config.
|
|
*/
|
|
|
|
/*
|
|
HTML Purifier 4.6.0 - Standards Compliant HTML Filtering
|
|
Copyright (C) 2006-2008 Edward Z. Yang
|
|
|
|
This library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
This library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with this library; if not, write to the Free Software
|
|
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
/**
|
|
* Facade that coordinates HTML Purifier's subsystems in order to purify HTML.
|
|
*
|
|
* @note There are several points in which configuration can be specified
|
|
* for HTML Purifier. The precedence of these (from lowest to
|
|
* highest) is as follows:
|
|
* -# Instance: new HTMLPurifier($config)
|
|
* -# Invocation: purify($html, $config)
|
|
* These configurations are entirely independent of each other and
|
|
* are *not* merged (this behavior may change in the future).
|
|
*
|
|
* @todo We need an easier way to inject strategies using the configuration
|
|
* object.
|
|
*/
|
|
class HTMLPurifier
|
|
{
|
|
|
|
/**
|
|
* Version of HTML Purifier.
|
|
* @type string
|
|
*/
|
|
public $version = '4.6.0';
|
|
|
|
/**
|
|
* Constant with version of HTML Purifier.
|
|
*/
|
|
const VERSION = '4.6.0';
|
|
|
|
/**
|
|
* Global configuration object.
|
|
* @type HTMLPurifier_Config
|
|
*/
|
|
public $config;
|
|
|
|
/**
|
|
* Array of extra filter objects to run on HTML,
|
|
* for backwards compatibility.
|
|
* @type HTMLPurifier_Filter[]
|
|
*/
|
|
private $filters = array();
|
|
|
|
/**
|
|
* Single instance of HTML Purifier.
|
|
* @type HTMLPurifier
|
|
*/
|
|
private static $instance;
|
|
|
|
/**
|
|
* @type HTMLPurifier_Strategy_Core
|
|
*/
|
|
protected $strategy;
|
|
|
|
/**
|
|
* @type HTMLPurifier_Generator
|
|
*/
|
|
protected $generator;
|
|
|
|
/**
|
|
* Resultant context of last run purification.
|
|
* Is an array of contexts if the last called method was purifyArray().
|
|
* @type HTMLPurifier_Context
|
|
*/
|
|
public $context;
|
|
|
|
/**
|
|
* Initializes the purifier.
|
|
*
|
|
* @param HTMLPurifier_Config $config Optional HTMLPurifier_Config object
|
|
* for all instances of the purifier, if omitted, a default
|
|
* configuration is supplied (which can be overridden on a
|
|
* per-use basis).
|
|
* The parameter can also be any type that
|
|
* HTMLPurifier_Config::create() supports.
|
|
*/
|
|
public function __construct($config = null)
|
|
{
|
|
$this->config = HTMLPurifier_Config::create($config);
|
|
$this->strategy = new HTMLPurifier_Strategy_Core();
|
|
}
|
|
|
|
/**
|
|
* Adds a filter to process the output. First come first serve
|
|
*
|
|
* @param HTMLPurifier_Filter $filter HTMLPurifier_Filter object
|
|
*/
|
|
public function addFilter($filter)
|
|
{
|
|
trigger_error(
|
|
'HTMLPurifier->addFilter() is deprecated, use configuration directives' .
|
|
' in the Filter namespace or Filter.Custom',
|
|
E_USER_WARNING
|
|
);
|
|
$this->filters[] = $filter;
|
|
}
|
|
|
|
/**
|
|
* Filters an HTML snippet/document to be XSS-free and standards-compliant.
|
|
*
|
|
* @param string $html String of HTML to purify
|
|
* @param HTMLPurifier_Config $config Config object for this operation,
|
|
* if omitted, defaults to the config object specified during this
|
|
* object's construction. The parameter can also be any type
|
|
* that HTMLPurifier_Config::create() supports.
|
|
*
|
|
* @return string Purified HTML
|
|
*/
|
|
public function purify($html, $config = null)
|
|
{
|
|
// :TODO: make the config merge in, instead of replace
|
|
$config = $config ? HTMLPurifier_Config::create($config) : $this->config;
|
|
|
|
// implementation is partially environment dependant, partially
|
|
// configuration dependant
|
|
$lexer = HTMLPurifier_Lexer::create($config);
|
|
|
|
$context = new HTMLPurifier_Context();
|
|
|
|
// setup HTML generator
|
|
$this->generator = new HTMLPurifier_Generator($config, $context);
|
|
$context->register('Generator', $this->generator);
|
|
|
|
// set up global context variables
|
|
if ($config->get('Core.CollectErrors')) {
|
|
// may get moved out if other facilities use it
|
|
$language_factory = HTMLPurifier_LanguageFactory::instance();
|
|
$language = $language_factory->create($config, $context);
|
|
$context->register('Locale', $language);
|
|
|
|
$error_collector = new HTMLPurifier_ErrorCollector($context);
|
|
$context->register('ErrorCollector', $error_collector);
|
|
}
|
|
|
|
// setup id_accumulator context, necessary due to the fact that
|
|
// AttrValidator can be called from many places
|
|
$id_accumulator = HTMLPurifier_IDAccumulator::build($config, $context);
|
|
$context->register('IDAccumulator', $id_accumulator);
|
|
|
|
$html = HTMLPurifier_Encoder::convertToUTF8($html, $config, $context);
|
|
|
|
// setup filters
|
|
$filter_flags = $config->getBatch('Filter');
|
|
$custom_filters = $filter_flags['Custom'];
|
|
unset($filter_flags['Custom']);
|
|
$filters = array();
|
|
foreach ($filter_flags as $filter => $flag) {
|
|
if (!$flag) {
|
|
continue;
|
|
}
|
|
if (strpos($filter, '.') !== false) {
|
|
continue;
|
|
}
|
|
$class = "HTMLPurifier_Filter_$filter";
|
|
$filters[] = new $class;
|
|
}
|
|
foreach ($custom_filters as $filter) {
|
|
// maybe "HTMLPurifier_Filter_$filter", but be consistent with AutoFormat
|
|
$filters[] = $filter;
|
|
}
|
|
$filters = array_merge($filters, $this->filters);
|
|
// maybe prepare(), but later
|
|
|
|
for ($i = 0, $filter_size = count($filters); $i < $filter_size; $i++) {
|
|
$html = $filters[$i]->preFilter($html, $config, $context);
|
|
}
|
|
|
|
// purified HTML
|
|
$html =
|
|
$this->generator->generateFromTokens(
|
|
// list of tokens
|
|
$this->strategy->execute(
|
|
// list of un-purified tokens
|
|
$lexer->tokenizeHTML(
|
|
// un-purified HTML
|
|
$html,
|
|
$config,
|
|
$context
|
|
),
|
|
$config,
|
|
$context
|
|
)
|
|
);
|
|
|
|
for ($i = $filter_size - 1; $i >= 0; $i--) {
|
|
$html = $filters[$i]->postFilter($html, $config, $context);
|
|
}
|
|
|
|
$html = HTMLPurifier_Encoder::convertFromUTF8($html, $config, $context);
|
|
$this->context =& $context;
|
|
return $html;
|
|
}
|
|
|
|
/**
|
|
* Filters an array of HTML snippets
|
|
*
|
|
* @param string[] $array_of_html Array of html snippets
|
|
* @param HTMLPurifier_Config $config Optional config object for this operation.
|
|
* See HTMLPurifier::purify() for more details.
|
|
*
|
|
* @return string[] Array of purified HTML
|
|
*/
|
|
public function purifyArray($array_of_html, $config = null)
|
|
{
|
|
$context_array = array();
|
|
foreach ($array_of_html as $key => $html) {
|
|
$array_of_html[$key] = $this->purify($html, $config);
|
|
$context_array[$key] = $this->context;
|
|
}
|
|
$this->context = $context_array;
|
|
return $array_of_html;
|
|
}
|
|
|
|
/**
|
|
* Singleton for enforcing just one HTML Purifier in your system
|
|
*
|
|
* @param HTMLPurifier|HTMLPurifier_Config $prototype Optional prototype
|
|
* HTMLPurifier instance to overload singleton with,
|
|
* or HTMLPurifier_Config instance to configure the
|
|
* generated version with.
|
|
*
|
|
* @return HTMLPurifier
|
|
*/
|
|
public static function instance($prototype = null)
|
|
{
|
|
if (!self::$instance || $prototype) {
|
|
if ($prototype instanceof HTMLPurifier) {
|
|
self::$instance = $prototype;
|
|
} elseif ($prototype) {
|
|
self::$instance = new HTMLPurifier($prototype);
|
|
} else {
|
|
self::$instance = new HTMLPurifier();
|
|
}
|
|
}
|
|
return self::$instance;
|
|
}
|
|
|
|
/**
|
|
* Singleton for enforcing just one HTML Purifier in your system
|
|
*
|
|
* @param HTMLPurifier|HTMLPurifier_Config $prototype Optional prototype
|
|
* HTMLPurifier instance to overload singleton with,
|
|
* or HTMLPurifier_Config instance to configure the
|
|
* generated version with.
|
|
*
|
|
* @return HTMLPurifier
|
|
* @note Backwards compatibility, see instance()
|
|
*/
|
|
public static function getInstance($prototype = null)
|
|
{
|
|
return HTMLPurifier::instance($prototype);
|
|
}
|
|
}
|
|
|
|
// vim: et sw=4 sts=4
|