<?php

/*
 * newPHPClass_1 [ TIPO ]
 * Descricao
 * @author Luan Martins
 * @copyright (c) year, Luan Martins - LM Desenvolvimentos
 */
// vou te msotrar oque acontece
class Csrf {
          //inicio de codigo
          public function get_token_id(){
                    if(isset($_SESSION['token_id'])){
                              return $_SESSION['token_id'];
                    }else{
                              $token_id = $this->random(10);
                              $_SESSION['token_id'] = $token_id;
                              return $token_id;
                    }
          }

          public function get_token(){
                    if(isset($_SESSION['token_value'])){
                              return $_SESSION['token_value'];
                    }else{
                              $token = hash('sha256', $this->random(500));
                              $_SESSION['token_value'] = $token;
                              return $token;
                    }
          }

          public function check_valid($method) {
          if($method == 'post' || $method == 'get') {
                    $post = $_POST;
                    $get = $_GET;
                    if(isset(${$method}[$this->get_token_id()]) && (${$method}[$this->get_token_id()] == $this->get_token())) {
                              return true;
                    } else {
                              return false;
                    }
          } else {
                    return false;
                 }
          }
          public function form_names($names, $regenerate) {
                    $values = array();
                    foreach ($names as $n) {
                            if($regenerate == true) {
                                    unset($_SESSION[$n]);
                            }
                            $s = isset($_SESSION[$n]) ? $_SESSION[$n] : $this->random(10);
                            $_SESSION[$n] = $s;
                            $values[$n] = $s;
                    }
                    return $values;
          }
          private function random($len) {
                    if (function_exists('openssl_random_pseudo_bytes')) {
                            $byteLen = intval(($len / 2) + 1);
                            $return = substr(bin2hex(openssl_random_pseudo_bytes($byteLen)), 0, $len);
                    } elseif (@is_readable('/dev/urandom')) {
                            $f=fopen('/dev/urandom', 'r');
                            $urandom=fread($f, $len);
                            fclose($f);
                            $return = '';
                    }

                    if (empty($return)) {
                            for ($i=0;$i<$len;++$i) {
                                    if (!isset($urandom)) {
                                            if ($i%2==0) {
                                                         mt_srand(time()%2147 * 1000000 + (double)microtime() * 1000000);
                                            }
                                            $rand=48+mt_rand()%64;
                                    } else {
                                            $rand=48+ord($urandom[$i])%64;
                                    }

                                    if ($rand>57)
                                            $rand+=7;
                                    if ($rand>90)
                                            $rand+=6;

                                    if ($rand==123) $rand=52;
                                    if ($rand==124) $rand=53;
                                    $return.=chr($rand);
                            }
                    }

                    return $return;
            }
}