introducing a sanitize HTML function for the internal and the public API. This

allows to easily convert strings to HTML before displaying them on the web page
to reduce the risk of xss vulnerabilities.

lib/public/util.php

@@ -264,6 +264,18 @@ class Util {
 	public static function callCheck(){
 		return(\OC_Util::callCheck());
 	}
+	
+	/**
+	 * @brief Used to sanitize HTML
+	 *
+	 * This function is used to sanitize HTML and should be applied on any string or array of strings before displaying it on a web page.
+	 *
+	 * @param string or array of strings
+	 * @return array with sanitized strings or a single sinitized string, depends on the input parameter.
+	 */
+	public static function sanitizeHTML( $value ){
+		return(\OC_Util::sanitizeHTML($value)); //Specify encoding for PHP<5.4
+	}
 }
 
 ?>

lib/util.php

@@ -370,7 +370,7 @@ class OC_Util {
 		$_SESSION['requesttoken-'.$token]=time();
 
 		// cleanup old tokens garbage collector
-		// only run every 20th time so we don´t waste cpu cycles
+		// only run every 20th time so we don't waste cpu cycles
 		if(rand(0,20)==0) {  
 			foreach($_SESSION as $key=>$value) {
 				// search all tokens in the session
@@ -426,4 +426,19 @@ class OC_Util {
 			exit;
 		}
 	}
+	
+	/**
+	 * @brief Public function to sanitize HTML
+	 *
+	 * This function is used to sanitize HTML and should be applied on any string or array of strings before displaying it on a web page.
+	 * 
+	 * @param string or array of strings
+	 * @return array with sanitized strings or a single sinitized string, depends on the input parameter.
+	 */
+	public static function sanitizeHTML( &$value ){
+		if (is_array($value) || is_object($value)) array_walk_recursive($value,'OC_Util::sanitizeHTML');
+		else $value = htmlentities($value, ENT_QUOTES, 'UTF-8'); //Specify encoding for PHP<5.4
+		return $value;
+	}
+
 }