<?php
/**
 * loginManager/lmUtils.php
 * @desc utilities for correct functioning
 * @version 1.0
 * @author Fándly Gergő Zoltán
 * @copy 2017 Fándly Gergő Zoltán
 */

class lmUtils{
    /**
     * generate a random string with special character
     * @param int $length length of the requested string
     * @return string
     */
    public static function randomString($length){
        $charset="0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ~!@#$%^&*()_-=+\?/.>,<";
        $charsetLength=strlen($charset);
        $string="";
        for($i=0; $i<$length; $i++){
            $string.=$charset[rand(0, $charsetLength-1)];
        }
        return $string;
    }
    
    /**
     * validate google ReCaptcha
     * @param string $secretkey secret key to captcha API
     * @param string $response response of API
     * @return bool
     */
    public static function validateCaptcha($secretkey, $response){
        $verify=file_get_contents("https://www.google.com/recaptcha/api/siteverify?secret=".$secretkey."&response=".$response);
        $data=json_decode($verify);
        if($data->success){
            return true;
        }
        else{
            return false;
        }
    }
}

?>