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<?php
namespace PicoFeed\Filter;
use PicoFeed\Config\Config;
use PicoFeed\Client\Url;
use PicoFeed\Scraper\RuleLoader;
use PicoFeed\Parser\XmlParser;
/**
* HTML Filter class
*
* @author Frederic Guillot
* @package Filter
*/
class Html
{
/**
* Config object
*
* @access private
* @var \PicoFeed\Config\Config
*/
private $config;
/**
* Unfiltered XML data
*
* @access private
* @var string
*/
private $input = '';
/**
* Filtered XML data
*
* @access private
* @var string
*/
private $output = '';
/**
* List of empty tags
*
* @access private
* @var array
*/
private $empty_tags = array();
/**
* Empty flag
*
* @access private
* @var boolean
*/
private $empty = true;
/**
* Tag instance
*
* @access public
* @var \PicoFeed\Filter\Tag
*/
public $tag = '';
/**
* Attribute instance
*
* @access public
* @var \PicoFeed\Filter\Attribute
*/
public $attribute = '';
/**
* The website to filter
*
* @access private
* @var string
*/
private $website;
/**
* Initialize the filter, all inputs data must be encoded in UTF-8 before
*
* @access public
* @param string $html HTML content
* @param string $website Site URL (used to build absolute URL)
*/
public function __construct($html, $website)
{
$this->input = XmlParser::HtmlToXml($html);
$this->output = '';
$this->tag = new Tag;
$this->website = $website;
$this->attribute = new Attribute(new Url($website));
}
/**
* Set config object
*
* @access public
* @param \PicoFeed\Config\Config $config Config instance
* @return \PicoFeed\Filter\Html
*/
public function setConfig($config)
{
$this->config = $config;
if ($this->config !== null) {
$this->attribute->setImageProxyCallback($this->config->getFilterImageProxyCallback());
$this->attribute->setImageProxyUrl($this->config->getFilterImageProxyUrl());
$this->attribute->setImageProxyProtocol($this->config->getFilterImageProxyProtocol());
$this->attribute->setIframeWhitelist($this->config->getFilterIframeWhitelist(array()));
$this->attribute->setIntegerAttributes($this->config->getFilterIntegerAttributes(array()));
$this->attribute->setAttributeOverrides($this->config->getFilterAttributeOverrides(array()));
$this->attribute->setRequiredAttributes($this->config->getFilterRequiredAttributes(array()));
$this->attribute->setMediaBlacklist($this->config->getFilterMediaBlacklist(array()));
$this->attribute->setMediaAttributes($this->config->getFilterMediaAttributes(array()));
$this->attribute->setSchemeWhitelist($this->config->getFilterSchemeWhitelist(array()));
$this->attribute->setWhitelistedAttributes($this->config->getFilterWhitelistedTags(array()));
$this->tag->setWhitelistedTags(array_keys($this->config->getFilterWhitelistedTags(array())));
}
return $this;
}
/**
* Run tags/attributes filtering
*
* @access public
* @return string
*/
public function execute()
{
$this->preFilter();
$parser = xml_parser_create();
xml_set_object($parser, $this);
xml_set_element_handler($parser, 'startTag', 'endTag');
xml_set_character_data_handler($parser, 'dataTag');
xml_parser_set_option($parser, XML_OPTION_CASE_FOLDING, false);
xml_parse($parser, $this->input, true);
xml_parser_free($parser);
$this->postFilter();
return $this->output;
}
/**
* Called before XML parsing
*
* @access public
*/
public function preFilter()
{
$this->input = $this->tag->removeBlacklistedTags($this->input);
}
/**
* Called after XML parsing
*
* @access public
*/
public function postFilter()
{
$this->output = $this->tag->removeEmptyTags($this->output);
$this->output = $this->filterRules($this->output);
$this->output = $this->tag->removeMultipleBreakTags($this->output);
$this->output = trim($this->output);
}
/**
* Called after XML parsing
* @param string $content the content that should be filtered
*
* @access public
*/
public function filterRules($content)
{
// the constructor should require a config, then this if can be removed
if ($this->config === null) {
$config = new Config;
} else {
$config = $this->config;
}
$loader = new RuleLoader($config);
$rules = $loader->getRules($this->website);
$url = new Url($this->website);
$sub_url = $url->getFullPath();
if (isset($rules['filter'])) {
foreach ($rules['filter'] as $pattern => $rule) {
if (preg_match($pattern, $sub_url)) {
foreach($rule as $search => $replace) {
$content = preg_replace($search, $replace, $content);
}
}
}
}
return $content;
}
/**
* Parse opening tag
*
* @access public
* @param resource $parser XML parser
* @param string $tag Tag name
* @param array $attributes Tag attributes
*/
public function startTag($parser, $tag, array $attributes)
{
$this->empty = true;
if ($this->tag->isAllowed($tag, $attributes)) {
$attributes = $this->attribute->filter($tag, $attributes);
if ($this->attribute->hasRequiredAttributes($tag, $attributes)) {
$attributes = $this->attribute->addAttributes($tag, $attributes);
$this->output .= $this->tag->openHtmlTag($tag, $this->attribute->toHtml($attributes));
$this->empty = false;
}
}
$this->empty_tags[] = $this->empty;
}
/**
* Parse closing tag
*
* @access public
* @param resource $parser XML parser
* @param string $tag Tag name
*/
public function endTag($parser, $tag)
{
if (! array_pop($this->empty_tags) && $this->tag->isAllowedTag($tag)) {
$this->output .= $this->tag->closeHtmlTag($tag);
}
}
/**
* Parse tag content
*
* @access public
* @param resource $parser XML parser
* @param string $content Tag content
*/
public function dataTag($parser, $content)
{
// Replace with normal space
$content = str_replace("\xc2\xa0", ' ', $content);
$this->output .= Filter::escape($content);
}
}
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