Fix: kontakt

system/helpers/valid.php

@@ -75,9 +75,28 @@ class valid_Core {
 	 * @param   string   URL
 	 * @return  boolean
 	 */
-	public static function url($url)
+	public static function url($url, $scheme = NULL)
 	{
-		return (bool) filter_var($url, FILTER_VALIDATE_URL, FILTER_FLAG_HOST_REQUIRED);
+		if ( ! is_string($url) OR $url === '')
+			return FALSE;
+
+		$parts = @parse_url($url);
+
+		if ( ! is_array($parts) OR empty($parts['scheme']) OR empty($parts['host']))
+			return FALSE;
+
+		if ( ! preg_match('/^[a-z][a-z0-9+.-]*$/iD', $parts['scheme']))
+			return FALSE;
+
+		if ($scheme !== NULL)
+		{
+			$url_scheme = strtolower($parts['scheme']);
+			$schemes = array_map('strtolower', (array) $scheme);
+
+			return in_array($url_scheme, $schemes, TRUE);
+		}
+
+		return TRUE;
 	}
 
 	/**
@@ -335,4 +354,4 @@ class valid_Core {
 		return (bool) preg_match($pattern, (string) $str);
 	}
 
-} // End valid
+} // End valid