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Filename : lib.filterinput.php
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<?php defined("IN_DOCEBO") or die('Direct access is forbidden.');

/* ======================================================================== \
| 	DOCEBO - The E-Learning Suite											|
| 																			|
| 	Copyright (c) 2008 (Docebo)												|
| 	http://www.docebo.com													|
|   License 	http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt		|
\ ======================================================================== */

class FilterInput {


	public $tool = '';

	protected $htmlpurifier = NULL;

	protected $use_xss_clean = true;

	protected $session_whitelist =array('tag'=>array(), 'attrib'=>array());

	public function __construct() {}

	/**
	 * The function that follow are a modified version of the Khoana Input library.
	 *
	 * @author     Kohana Team
	 * @copyright  (c) 2007-2008 Kohana Team
	 * @license    http://kohanaphp.com/license.html
	 */

	public function sanitize() {

		// load the tool that we want to use in the xss filtering process
		$this->loadTool();

		if (is_array($_GET) AND count($_GET) > 0) {

			$_GET = $this->clean_input_data($_GET);
		}
		if (is_array($_POST) AND count($_POST) > 0) {

			$_POST = $this->clean_input_data($_POST);
		}
		if (is_array($_COOKIE) AND count($_COOKIE) > 0) {

			$_COOKIE = $this->clean_input_data($_COOKIE);
		}
		if (is_array($_FILES) AND count($_FILES) > 0) {

			//$_FILES = $this->clean_input_data($_FILES, true);
		}

	}
	
	
	protected function loadTool() {
		// load the tool that we want to use in the xss filtering process
		switch($this->tool) {
			case "none" : {

				//only used for a god admin
			};break;
			case "htmlpurifier" : {

				//htmlpurifier  is the best class in order to clean and validate the user input
				//his major drawback is that it requires a lot of resource to operate, so is better
				//to use it only if really needed

				require_once _base_.'/addons/htmlpurifier/HTMLPurifier.standalone.php';
				$config = HTMLPurifier_Config::createDefault();

				if (count($this->getWhitelist('tag')) > 0) {
					$default = $this->getHtmlPurifierDefaultElements(); // this has to be the first thing to be setup!
					$allowed = array_unique(array_merge($default, $this->getWhitelist('tag')));
					$config->set('HTML.AllowedElements', $allowed);
					if (in_array('object', $this->getWhitelist('tag'))) {
						$config->set('HTML.SafeObject', true);
						$config->set('Output.FlashCompat', true);
					}					
				}

				if (count($this->getWhitelist('attrib')) > 0) {
					$default = $this->getHtmlPurifierDefaultAttributes();
					$allowed = array_unique(array_merge($default, $this->getWhitelist('attrib')));
					$config->set('HTML.AllowedAttributes', $allowed);
				}

				$config->set('HTML.TidyLevel', 'none');
				$this->html_purifier = new HTMLPurifier($config);				
			};break;
			case 'htmlawed' : {

				//another class aganist xss
				require_once _base_.'/addons/htmlawed/htmlawed.php';
			};break;
			case 'kses' :
			default: {

				//another class aganist xss
				require_once _base_.'/addons/kses/kses.php';

				if ($this->getWhitelist('tag')) {
					foreach($this->getWhitelist('tag') as $val) {
						if (!isset($GLOBALS['allowed_html'][$val])) {
							$GLOBALS['allowed_html'][$val]=array();
						}
					}
				}
				if ($this->getWhitelist('attrib')) {
					foreach($this->getWhitelist('attrib') as $val) {
						list($tag, $attrib)=explode('.', $val);
						if (!isset($GLOBALS['allowed_html'][$tag])) {
							$GLOBALS['allowed_html'][$tag]=array();
						}
						$GLOBALS['allowed_html'][$tag][$attrib]=array();
					}
				}
			};break;
		}
	}


	/**
	 * Append items (tag or attributes) to the session whitelist
	 * @param <array> $items('tag'=>array(), 'attrib'=>array())
	 */
	public function appendToWhitelist($items) {
		if (isset($items['tag'])) {
			$this->session_whitelist['tag']=array_merge($this->session_whitelist['tag'], $items['tag']);
		}
		if (isset($items['attrib'])) {
			$this->session_whitelist['attrib']=array_merge($this->session_whitelist['attrib'], $items['attrib']);
		}
	}


	public function getWhitelist($item_type) {
		$res = array();
		if (!empty($this->session_whitelist[$item_type])) {
			$res =$this->session_whitelist[$item_type];
		}
		return $res;
	}

	
	protected function getHtmlPurifierDefaultElements() {
		$temp = HTMLPurifier_Config::createDefault();		
		$def =$temp->getHTMLDefinition();
		ksort($def->info);
		$res =array_keys($def->info);
		unset($temp);
		
		return $res;
	}


	protected function getHtmlPurifierDefaultAttributes() {
		$temp = HTMLPurifier_Config::createDefault();
		$def =$temp->getHTMLDefinition();
		ksort($def->info);
		$res = array();
		foreach ($def->info as $key => $value) {
			foreach ($value->attr as $attr => $attr_data) {
				$res[] = $key.'.'.$attr;
			}
		}
		unset($temp);

		return $res;
	}

	
	/**
	 * @param array $data
	 * @return array 
	 */
	public function clean($data) {
		// load the tool that we want to use in the xss filtering process
		$this->loadTool();
		
		return $this->clean_input_data($data);
	}
	

	/**
	 * This is a helper function. It escapes data and standardizes newline characters to '\n'.
	 *
	 * @param   unknown_type  string to clean
	 * @return  string
	 */
	protected function clean_input_data($str, $is_files_arr = false) {

		if (is_array($str)) {
			$new_array = array();
			foreach ($str as $key => $val) {
				if(!$is_files_arr || $key == 'tmp_name') $new_array[$this->clean_input_keys($key)] = $this->clean_input_data($val);
			}
			return $new_array;
		}

		if (get_magic_quotes_gpc()) {
			$str = stripslashes($str);
		}

		if ($this->use_xss_clean === TRUE) {
			$str = $this->xss_clean($str);
		}

		// Backward compatibility :(
        $str = addslashes($str);

		// Standardize newlines
		return str_replace(array("\r\n", "\r"), "\n", $str);
	}

	/**
	 * This is a helper function. To prevent malicious users
	 * from trying to exploit keys we make sure that keys are
	 * only named with alpha-numeric text and a few other items.
	 *
	 * @param   string  string to clean
	 * @return  string
	 */
	protected function clean_input_keys($str) {
		
		if ( ! preg_match('#^[&a-zA-Z0-9\.:_/\-\s]+$#uD', $str)) {
			echo $str.'<br />';
			exit('Disallowed key characters in global data.');
		}

		return $str;
	}

	public function xss_clean($data)  {

		if (is_array($data)) {
			foreach ($data as $key => $val) {
				$data[$key] = $this->xss_clean($val);
			}
			return $data;
		}

		// It is a string
		$string = $data;

		// Do not clean empty strings
		if (trim($string) == '')
			return $string;

		switch ($this->tool) {
			case "none" : {

				// Only used for a god admin
			};break;
			case 'htmlpurifier' : {

				// Run HTMLPurifier
				$string = $this->html_purifier->purify($string);
			};break;
			case 'htmlawed' : {

				// Run htmLawed
				$string = htmlawed($string, array('safe'=>1));
			};break;
			case 'kses' :
			default : {

				// Run htmLawed
				$string = kses($string, $GLOBALS['allowed_html']);
			};break;
		}

		return $string;
	}

	/**
	 * End of khoana like functions.
	 */

}

?>