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<?php |
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/** |
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* Util |
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* |
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* @copyright Copyright (c) Gjero Krsteski (http://krsteski.de) |
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* @license http://opensource.org/licenses/MIT MIT License |
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*/ |
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namespace Pimf\Util\Character; |
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/** |
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* String |
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* |
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* @package Util_String |
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* @author Gjero Krsteski <[email protected]> |
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*/ |
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class Sanitize |
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{ |
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/** |
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* @param string $string String to check |
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* |
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* @return mixed |
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*/ |
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public static function removeNullCharacters($string) |
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{ |
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return preg_replace(array('/\0+/', '/(\\\\0)+/'), '', $string); |
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} |
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/** |
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* @param string $string String to check |
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* |
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* @return mixed |
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*/ |
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public static function validateStandardCharacterEntities($string) |
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{ |
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return preg_replace('#(&\#*\w+)[\x00-\x20]+;#u', "\\1;", $string); |
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} |
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/** |
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* @param string $string String to check |
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* |
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* @return mixed |
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*/ |
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public static function validateUTF16TwoByteEncoding($string) |
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{ |
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return preg_replace('#(&\#x*)([0-9A-F]+);*#iu', "\\1\\2;", $string); |
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} |
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/** |
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* @param string $string String to check |
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* |
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* @return mixed |
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*/ |
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public static function strangeThingsAreSubmitted($string) |
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{ |
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return preg_replace(array("/%u0([a-z0-9]{3})/i", "/%([a-z0-9]{2})/i"), "&#x\\1;", $string); |
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} |
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/** |
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* @param string $string String to check |
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* @param string $charset Character set (default ISO-8859-1) |
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* |
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* @return mixed |
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*/ |
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public static function convertCharacterEntitiesToASCII($string, $charset) |
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{ |
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$matches = array(); |
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if (preg_match_all("/<(.+?)>/si", $string, $matches)) { |
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$count = count($matches['0']); |
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for ($i = 0; $i < $count; $i++) { |
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$string = str_replace( |
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$matches['1'][$i], |
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html_entity_decode($matches['1'][$i], ENT_COMPAT, $charset), |
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$string |
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); |
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} |
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} |
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return $string; |
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} |
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/** |
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* @param string $string String to check |
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* |
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* @return mixed |
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*/ |
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public static function convertAllTabsToSpaces($string) |
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{ |
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return preg_replace("#\t+#", " ", $string); |
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} |
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/** |
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* @param string $string String to check |
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* |
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* @return mixed |
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*/ |
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public static function makesPhpTagsSafe($string) |
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{ |
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return str_replace( |
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array('<?php', '<?PHP', '<?', '?>'), |
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array('<?php', '<?PHP', '<?', '?>'), |
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$string |
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); |
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} |
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/** |
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* @param string $string String to check |
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* |
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* @return mixed |
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*/ |
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public static function compactAnyExplodedWords($string) |
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{ |
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$words = array('javascript', 'vbscript', 'script', 'applet', 'alert', 'document', 'write', 'cookie', 'window'); |
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foreach ($words as $word) { |
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$temp = ''; |
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$len = strlen($word); |
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for ($i = 0; $i < $len; $i++) { |
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$temp .= substr($word, $i, 1) . "\s*"; |
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} |
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$temp = substr($temp, 0, -3); |
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$string = preg_replace('#' . $temp . '#s', $word, $string); |
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$string = preg_replace('#' . ucfirst($temp) . '#s', ucfirst($word), $string); |
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} |
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return $string; |
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} |
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/** |
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* @param string $string String to check |
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* |
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* @return mixed |
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*/ |
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public static function removeDisallowedJavaScriptInLinksOrImgTags($string) |
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{ |
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$string = preg_replace( |
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"#<a.+?href=.*?(alert\(|alert&\#40;|javascript\:|window\.|document\.|\.cookie|<script|<xss).*?\>.*?</a>#si", |
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"", |
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$string |
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); |
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$string = preg_replace( |
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"#<img.+?src=.*?(alert\(|alert&\#40;|javascript\:|window\.|document\.|\.cookie|<script|<xss).*?\>#si", |
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"", |
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$string |
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); |
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return preg_replace("#<(script|xss).*?\>#si", "", $string); |
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} |
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/** |
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* @param string $string String to check |
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* |
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* @return mixed |
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*/ |
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public static function removeJavaScriptEventHandlers($string) |
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{ |
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return preg_replace( |
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'#(<[^>]+.*?)(onblur|onchange|onclick|onfocus|onload|onmouseover|onmouseup|' |
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. 'onmousedown|onselect|onsubmit|onunload|onkeypress|onkeydown|onkeyup|onresize)[^>]*>#iU', |
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"\\1>", |
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$string |
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); |
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} |
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/** |
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* @param string $string String to check |
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* |
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* @return mixed |
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*/ |
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public static function healNaughtyHTMLElements($string) |
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{ |
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return preg_replace( |
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'#<(/*\s*)(alert|applet|basefont|base|behavior|bgsound|' |
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. 'blink|body|embed|expression|form|frameset|frame|head|html|ilayer|iframe|input' |
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. '|layer|link|meta|object|plaintext|style|script|textarea|title|xml|xss)([^>]*)>#is', |
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"<\\1\\2\\3>", |
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$string |
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); |
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} |
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/** |
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* @param string $string String to check |
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* |
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* @return mixed |
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*/ |
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public static function healNaughtyScriptingElements($string) |
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{ |
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return preg_replace( |
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'#(alert|cmd|passthru|eval|exec|system|fopen|fsockopen|' |
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. 'file|file_get_contents|readfile|unlink)(\s*)\((.*?)\)#si', |
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"\\1\\2(\\3)", |
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$string |
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); |
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} |
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/** |
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* @param string $string String to check |
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* |
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* @return mixed |
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*/ |
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public static function removeJavaScriptHardRedirects($string) |
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{ |
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$bad = array( |
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'document.cookie' => '', |
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'document.write' => '', |
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'window.location' => '', |
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"javascript\s*:" => '', |
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"Redirect\s+302" => '', |
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'<!--' => '<!--', |
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'-->' => '-->' |
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); |
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foreach ($bad as $key => $val) { |
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$string = preg_replace("#" . $key . "#i", $val, $string); |
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} |
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return $string; |
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} |
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} |
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