<?php


require_once('class/Filter/BaseHTMLFilter.php');

/*
Options recognized:
FILTER_HTTPS_FROM  (string) - URL to search (recommended protocol + base URL)
FILTER_HTTPS_TO    (string) - URL to replace the source with (recommended new protocol + base URL)

FILTER_HTTPS_LINK  (bool)   - whether to replace "a href" and "area href"
FILTER_HTTPS_FORM  (bool)   - whether to replace "form action"
FILTER_HTTPS_FRAME (bool)   - whether to replace "frmae src" and "iframe src"

*/

                     
class LinksFilter extends BaseHTMLFilter
{
	var $_tag_list = array(
		'base' => array('href'),
		'img' => array('src'),
		'link' => array('href'),
		'script' => array('src'),
		'embed' => array('src'),
		'frame' => array('src'),
	);
	var $_tag_list_link = array(
		'a' => array('href'),
		'area' => array('href'),
	);
	var $_tag_list_form = array(
		'form' => array('action'),
	);
	var $_tag_list_frame = array(
		'frame' => array('src'),
		'iframe' => array('src'),
	);

	function process_attr(&$list, $tag_name, $attr, $reverse)
	{
		if($reverse){
			$to = $this->_options['FILTER_HTTPS_FROM'];
			$from = $this->_options['FILTER_HTTPS_TO'];
		} else {
			$from = $this->_options['FILTER_HTTPS_FROM'];
			$to = $this->_options['FILTER_HTTPS_TO'];
		}


		if($from && $to){
			$tag_name = strtolower($tag_name);

			$attr_list = $list[$tag_name];
			if($attr_list){
				foreach($attr as $name => $value){
					if(in_array(strtolower($name), $attr_list) && $value !== NULL){
						if($reverse && strpos($value, $to) === false && !preg_match('/^\w+\:\/\//', $value))
							$value = $to . (substr($to, -1) == '/'? '': '/') . $value;
						$attr[$name] = str_replace($from, $to, $value);
					}
				}
			}
		}
		return $attr;
	}

	function doOpenTag(&$Parser, $TagName, $Attr, $Empty)
	{
		$Attr = $this->process_attr($this->_tag_list, $TagName, $Attr, false);

		$Attr = $this->process_attr($this->_tag_list_link, $TagName, $Attr, !((bool)$this->_options['FILTER_HTTPS_LINK']));

		$Attr = $this->process_attr($this->_tag_list_form, $TagName, $Attr, !((bool)$this->_options['FILTER_HTTPS_FORM']));

		$Attr = $this->process_attr($this->_tag_list_frame, $TagName, $Attr, !((bool)$this->_options['FILTER_HTTPS_FRAME']));

		parent::doOpenTag($Parser, $TagName, $Attr, $Empty);
	}

}


?>