diff options
Diffstat (limited to 'admin/survey/classes/htmlpurifier-4.3.0/library/HTMLPurifier.php')
| -rw-r--r-- | admin/survey/classes/htmlpurifier-4.3.0/library/HTMLPurifier.php | 237 |
1 files changed, 237 insertions, 0 deletions
diff --git a/admin/survey/classes/htmlpurifier-4.3.0/library/HTMLPurifier.php b/admin/survey/classes/htmlpurifier-4.3.0/library/HTMLPurifier.php new file mode 100644 index 0000000..66d147c --- /dev/null +++ b/admin/survey/classes/htmlpurifier-4.3.0/library/HTMLPurifier.php @@ -0,0 +1,237 @@ +<?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 4.3.0 - 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 */
+ public $version = '4.3.0';
+
+ /** Constant with version of HTML Purifier */
+ const VERSION = '4.3.0';
+
+ /** Global configuration object */
+ public $config;
+
+ /** Array of extra HTMLPurifier_Filter objects to run on HTML, for backwards compatibility */
+ private $filters = array();
+
+ /** Single instance of HTML Purifier */
+ private static $instance;
+
+ protected $strategy, $generator;
+
+ /**
+ * Resultant HTMLPurifier_Context of last run purification. Is an array
+ * of contexts if the last called method was purifyArray().
+ */
+ public $context;
+
+ /**
+ * Initializes the purifier.
+ * @param $config Optional HTMLPurifier_Config object for all instances of
+ * the purifier, if omitted, a default configuration is
+ * supplied (which can be overridden on a per-use basis).
+ * The parameter can also be any type that
+ * HTMLPurifier_Config::create() supports.
+ */
+ public function __construct($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 $filter HTMLPurifier_Filter object
+ */
+ public function addFilter($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 $html String of HTML to purify
+ * @param $config HTMLPurifier_Config object for this operation, if omitted,
+ * defaults to the config object specified during this
+ * object's construction. The parameter can also be any type
+ * that HTMLPurifier_Config::create() supports.
+ * @return Purified HTML
+ */
+ public function purify($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 $config Optional HTMLPurifier_Config object for this operation.
+ * See HTMLPurifier::purify() for more details.
+ * @return Array of purified HTML
+ */
+ public function purifyArray($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 $prototype Optional prototype HTMLPurifier instance to
+ * overload singleton with, or HTMLPurifier_Config
+ * instance to configure the generated version with.
+ */
+ public static function instance($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;
+ }
+
+ /**
+ * @note Backwards compatibility, see instance()
+ */
+ public static function getInstance($prototype = null) {
+ return HTMLPurifier::instance($prototype);
+ }
+
+}
+
+// vim: et sw=4 sts=4
|