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https://github.com/WordPress/WordPress.git
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git-svn-id: http://core.svn.wordpress.org/trunk@22366 1a063a9b-81f0-0310-95a4-ce76da25c4cd
550 lines
15 KiB
PHP
Executable File
550 lines
15 KiB
PHP
Executable File
<?php
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/**
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* SimplePie
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*
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* A PHP-Based RSS and Atom Feed Framework.
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* Takes the hard work out of managing a complete RSS/Atom solution.
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*
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* Copyright (c) 2004-2012, Ryan Parman, Geoffrey Sneddon, Ryan McCue, and contributors
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification, are
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* permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice, this list of
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* conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright notice, this list
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* of conditions and the following disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* * Neither the name of the SimplePie Team nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS
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* AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* @package SimplePie
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* @version 1.3.1
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* @copyright 2004-2012 Ryan Parman, Geoffrey Sneddon, Ryan McCue
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* @author Ryan Parman
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* @author Geoffrey Sneddon
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* @author Ryan McCue
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* @link http://simplepie.org/ SimplePie
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* @license http://www.opensource.org/licenses/bsd-license.php BSD License
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*/
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/**
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* Used for data cleanup and post-processing
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*
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*
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* This class can be overloaded with {@see SimplePie::set_sanitize_class()}
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*
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* @package SimplePie
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* @todo Move to using an actual HTML parser (this will allow tags to be properly stripped, and to switch between HTML and XHTML), this will also make it easier to shorten a string while preserving HTML tags
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*/
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class SimplePie_Sanitize
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{
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// Private vars
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var $base;
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// Options
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var $remove_div = true;
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var $image_handler = '';
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var $strip_htmltags = array('base', 'blink', 'body', 'doctype', 'embed', 'font', 'form', 'frame', 'frameset', 'html', 'iframe', 'input', 'marquee', 'meta', 'noscript', 'object', 'param', 'script', 'style');
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var $encode_instead_of_strip = false;
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var $strip_attributes = array('bgsound', 'class', 'expr', 'id', 'style', 'onclick', 'onerror', 'onfinish', 'onmouseover', 'onmouseout', 'onfocus', 'onblur', 'lowsrc', 'dynsrc');
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var $strip_comments = false;
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var $output_encoding = 'UTF-8';
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var $enable_cache = true;
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var $cache_location = './cache';
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var $cache_name_function = 'md5';
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var $timeout = 10;
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var $useragent = '';
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var $force_fsockopen = false;
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var $replace_url_attributes = null;
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public function __construct()
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{
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// Set defaults
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$this->set_url_replacements(null);
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}
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public function remove_div($enable = true)
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{
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$this->remove_div = (bool) $enable;
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}
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public function set_image_handler($page = false)
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{
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if ($page)
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{
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$this->image_handler = (string) $page;
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}
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else
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{
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$this->image_handler = false;
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}
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}
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public function set_registry(SimplePie_Registry $registry)
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{
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$this->registry = $registry;
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}
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public function pass_cache_data($enable_cache = true, $cache_location = './cache', $cache_name_function = 'md5', $cache_class = 'SimplePie_Cache')
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{
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if (isset($enable_cache))
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{
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$this->enable_cache = (bool) $enable_cache;
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}
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if ($cache_location)
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{
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$this->cache_location = (string) $cache_location;
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}
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if ($cache_name_function)
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{
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$this->cache_name_function = (string) $cache_name_function;
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}
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}
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public function pass_file_data($file_class = 'SimplePie_File', $timeout = 10, $useragent = '', $force_fsockopen = false)
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{
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if ($timeout)
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{
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$this->timeout = (string) $timeout;
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}
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if ($useragent)
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{
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$this->useragent = (string) $useragent;
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}
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if ($force_fsockopen)
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{
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$this->force_fsockopen = (string) $force_fsockopen;
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}
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}
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public function strip_htmltags($tags = array('base', 'blink', 'body', 'doctype', 'embed', 'font', 'form', 'frame', 'frameset', 'html', 'iframe', 'input', 'marquee', 'meta', 'noscript', 'object', 'param', 'script', 'style'))
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{
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if ($tags)
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{
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if (is_array($tags))
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{
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$this->strip_htmltags = $tags;
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}
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else
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{
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$this->strip_htmltags = explode(',', $tags);
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}
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}
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else
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{
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$this->strip_htmltags = false;
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}
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}
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public function encode_instead_of_strip($encode = false)
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{
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$this->encode_instead_of_strip = (bool) $encode;
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}
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public function strip_attributes($attribs = array('bgsound', 'class', 'expr', 'id', 'style', 'onclick', 'onerror', 'onfinish', 'onmouseover', 'onmouseout', 'onfocus', 'onblur', 'lowsrc', 'dynsrc'))
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{
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if ($attribs)
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{
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if (is_array($attribs))
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{
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$this->strip_attributes = $attribs;
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}
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else
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{
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$this->strip_attributes = explode(',', $attribs);
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}
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}
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else
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{
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$this->strip_attributes = false;
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}
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}
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public function strip_comments($strip = false)
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{
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$this->strip_comments = (bool) $strip;
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}
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public function set_output_encoding($encoding = 'UTF-8')
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{
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$this->output_encoding = (string) $encoding;
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}
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/**
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* Set element/attribute key/value pairs of HTML attributes
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* containing URLs that need to be resolved relative to the feed
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*
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* Defaults to |a|@href, |area|@href, |blockquote|@cite, |del|@cite,
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* |form|@action, |img|@longdesc, |img|@src, |input|@src, |ins|@cite,
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* |q|@cite
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*
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* @since 1.0
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* @param array|null $element_attribute Element/attribute key/value pairs, null for default
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*/
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public function set_url_replacements($element_attribute = null)
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{
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if ($element_attribute === null)
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{
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$element_attribute = array(
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'a' => 'href',
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'area' => 'href',
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'blockquote' => 'cite',
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'del' => 'cite',
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'form' => 'action',
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'img' => array(
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'longdesc',
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'src'
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),
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'input' => 'src',
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'ins' => 'cite',
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'q' => 'cite'
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);
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}
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$this->replace_url_attributes = (array) $element_attribute;
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}
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public function sanitize($data, $type, $base = '')
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{
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$data = trim($data);
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if ($data !== '' || $type & SIMPLEPIE_CONSTRUCT_IRI)
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{
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if ($type & SIMPLEPIE_CONSTRUCT_MAYBE_HTML)
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{
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if (preg_match('/(&(#(x[0-9a-fA-F]+|[0-9]+)|[a-zA-Z0-9]+)|<\/[A-Za-z][^\x09\x0A\x0B\x0C\x0D\x20\x2F\x3E]*' . SIMPLEPIE_PCRE_HTML_ATTRIBUTE . '>)/', $data))
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{
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$type |= SIMPLEPIE_CONSTRUCT_HTML;
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}
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else
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{
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$type |= SIMPLEPIE_CONSTRUCT_TEXT;
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}
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}
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if ($type & SIMPLEPIE_CONSTRUCT_BASE64)
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{
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$data = base64_decode($data);
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}
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if ($type & (SIMPLEPIE_CONSTRUCT_HTML | SIMPLEPIE_CONSTRUCT_XHTML))
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{
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$document = new DOMDocument();
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$document->encoding = 'UTF-8';
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$data = $this->preprocess($data, $type);
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set_error_handler(array('SimplePie_Misc', 'silence_errors'));
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$document->loadHTML($data);
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restore_error_handler();
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// Strip comments
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if ($this->strip_comments)
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{
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$xpath = new DOMXPath($document);
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$comments = $xpath->query('//comment()');
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foreach ($comments as $comment)
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{
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$comment->parentNode->removeChild($comment);
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}
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}
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// Strip out HTML tags and attributes that might cause various security problems.
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// Based on recommendations by Mark Pilgrim at:
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// http://diveintomark.org/archives/2003/06/12/how_to_consume_rss_safely
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if ($this->strip_htmltags)
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{
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foreach ($this->strip_htmltags as $tag)
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{
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$this->strip_tag($tag, $document, $type);
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}
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}
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if ($this->strip_attributes)
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{
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foreach ($this->strip_attributes as $attrib)
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{
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$this->strip_attr($attrib, $document);
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}
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}
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// Replace relative URLs
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$this->base = $base;
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foreach ($this->replace_url_attributes as $element => $attributes)
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{
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$this->replace_urls($document, $element, $attributes);
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}
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// If image handling (caching, etc.) is enabled, cache and rewrite all the image tags.
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if (isset($this->image_handler) && ((string) $this->image_handler) !== '' && $this->enable_cache)
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{
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$images = $document->getElementsByTagName('img');
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foreach ($images as $img)
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{
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if ($img->hasAttribute('src'))
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{
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$image_url = call_user_func($this->cache_name_function, $img->getAttribute('src'));
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$cache = $this->registry->call('Cache', 'get_handler', array($this->cache_location, $image_url, 'spi'));
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if ($cache->load())
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{
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$img->setAttribute('src', $this->image_handler . $image_url);
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}
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else
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{
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$file = $this->registry->create('File', array($img['attribs']['src']['data'], $this->timeout, 5, array('X-FORWARDED-FOR' => $_SERVER['REMOTE_ADDR']), $this->useragent, $this->force_fsockopen));
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$headers = $file->headers;
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if ($file->success && ($file->method & SIMPLEPIE_FILE_SOURCE_REMOTE === 0 || ($file->status_code === 200 || $file->status_code > 206 && $file->status_code < 300)))
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{
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if ($cache->save(array('headers' => $file->headers, 'body' => $file->body)))
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{
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$img->setAttribute('src', $this->image_handler . $image_url);
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}
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else
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{
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trigger_error("$this->cache_location is not writeable. Make sure you've set the correct relative or absolute path, and that the location is server-writable.", E_USER_WARNING);
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}
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}
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}
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}
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}
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}
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// Remove the DOCTYPE
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// Seems to cause segfaulting if we don't do this
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if ($document->firstChild instanceof DOMDocumentType)
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{
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$document->removeChild($document->firstChild);
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}
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// Move everything from the body to the root
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$real_body = $document->getElementsByTagName('body')->item(0)->childNodes->item(0);
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$document->replaceChild($real_body, $document->firstChild);
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// Finally, convert to a HTML string
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$data = trim($document->saveHTML());
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if ($this->remove_div)
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{
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$data = preg_replace('/^<div' . SIMPLEPIE_PCRE_XML_ATTRIBUTE . '>/', '', $data);
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$data = preg_replace('/<\/div>$/', '', $data);
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}
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else
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{
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$data = preg_replace('/^<div' . SIMPLEPIE_PCRE_XML_ATTRIBUTE . '>/', '<div>', $data);
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}
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}
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if ($type & SIMPLEPIE_CONSTRUCT_IRI)
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{
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$absolute = $this->registry->call('Misc', 'absolutize_url', array($data, $base));
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if ($absolute !== false)
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{
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$data = $absolute;
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}
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}
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if ($type & (SIMPLEPIE_CONSTRUCT_TEXT | SIMPLEPIE_CONSTRUCT_IRI))
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{
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$data = htmlspecialchars($data, ENT_COMPAT, 'UTF-8');
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}
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if ($this->output_encoding !== 'UTF-8')
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{
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$data = $this->registry->call('Misc', 'change_encoding', array($data, 'UTF-8', $this->output_encoding));
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}
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}
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return $data;
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}
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protected function preprocess($html, $type)
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{
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$ret = '';
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if ($type & ~SIMPLEPIE_CONSTRUCT_XHTML)
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{
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// Atom XHTML constructs are wrapped with a div by default
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// Note: No protection if $html contains a stray </div>!
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$html = '<div>' . $html . '</div>';
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$ret .= '<!DOCTYPE html>';
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$content_type = 'text/html';
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}
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else
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{
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$ret .= '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">';
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$content_type = 'application/xhtml+xml';
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}
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$ret .= '<html><head>';
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$ret .= '<meta http-equiv="Content-Type" content="' . $content_type . '; charset=utf-8" />';
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$ret .= '</head><body>' . $html . '</body></html>';
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return $ret;
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}
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public function replace_urls($document, $tag, $attributes)
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{
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if (!is_array($attributes))
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{
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$attributes = array($attributes);
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}
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if (!is_array($this->strip_htmltags) || !in_array($tag, $this->strip_htmltags))
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{
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$elements = $document->getElementsByTagName($tag);
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foreach ($elements as $element)
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{
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foreach ($attributes as $attribute)
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{
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if ($element->hasAttribute($attribute))
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{
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$value = $this->registry->call('Misc', 'absolutize_url', array($element->getAttribute($attribute), $this->base));
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if ($value !== false)
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{
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$element->setAttribute($attribute, $value);
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}
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}
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}
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}
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}
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}
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public function do_strip_htmltags($match)
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{
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if ($this->encode_instead_of_strip)
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{
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if (isset($match[4]) && !in_array(strtolower($match[1]), array('script', 'style')))
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{
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$match[1] = htmlspecialchars($match[1], ENT_COMPAT, 'UTF-8');
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$match[2] = htmlspecialchars($match[2], ENT_COMPAT, 'UTF-8');
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return "<$match[1]$match[2]>$match[3]</$match[1]>";
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}
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else
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{
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return htmlspecialchars($match[0], ENT_COMPAT, 'UTF-8');
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}
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}
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elseif (isset($match[4]) && !in_array(strtolower($match[1]), array('script', 'style')))
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{
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return $match[4];
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}
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else
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{
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return '';
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}
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}
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protected function strip_tag($tag, $document, $type)
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{
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$xpath = new DOMXPath($document);
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$elements = $xpath->query('body//' . $tag);
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if ($this->encode_instead_of_strip)
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{
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foreach ($elements as $element)
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{
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$fragment = $document->createDocumentFragment();
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// For elements which aren't script or style, include the tag itself
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if (!in_array($tag, array('script', 'style')))
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{
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$text = '<' . $tag;
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if ($element->hasAttributes())
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{
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$attrs = array();
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foreach ($element->attributes as $name => $attr)
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{
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$value = $attr->value;
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// In XHTML, empty values should never exist, so we repeat the value
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if (empty($value) && ($type & SIMPLEPIE_CONSTRUCT_XHTML))
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{
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$value = $name;
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}
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// For HTML, empty is fine
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elseif (empty($value) && ($type & SIMPLEPIE_CONSTRUCT_HTML))
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{
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$attrs[] = $name;
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continue;
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}
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// Standard attribute text
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$attrs[] = $name . '="' . $attr->value . '"';
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}
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$text .= ' ' . implode(' ', $attrs);
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}
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$text .= '>';
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$fragment->appendChild(new DOMText($text));
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}
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$number = $element->childNodes->length;
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for ($i = $number; $i > 0; $i--)
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{
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$child = $element->childNodes->item(0);
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$fragment->appendChild($child);
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}
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if (!in_array($tag, array('script', 'style')))
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{
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$fragment->appendChild(new DOMText('</' . $tag . '>'));
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}
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$element->parentNode->replaceChild($fragment, $element);
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}
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return;
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}
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elseif (in_array($tag, array('script', 'style')))
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{
|
|
foreach ($elements as $element)
|
|
{
|
|
$element->parentNode->removeChild($element);
|
|
}
|
|
|
|
return;
|
|
}
|
|
else
|
|
{
|
|
foreach ($elements as $element)
|
|
{
|
|
$fragment = $document->createDocumentFragment();
|
|
$number = $element->childNodes->length;
|
|
for ($i = $number; $i > 0; $i--)
|
|
{
|
|
$child = $element->childNodes->item(0);
|
|
$fragment->appendChild($child);
|
|
}
|
|
|
|
$element->parentNode->replaceChild($fragment, $element);
|
|
}
|
|
}
|
|
}
|
|
|
|
protected function strip_attr($attrib, $document)
|
|
{
|
|
$xpath = new DOMXPath($document);
|
|
$elements = $xpath->query('//*[@' . $attrib . ']');
|
|
|
|
foreach ($elements as $element)
|
|
{
|
|
$element->removeAttribute($attrib);
|
|
}
|
|
}
|
|
}
|