<?php

namespace Aiko;

class TokenSanitation
{
    private $token='';
    private $errors=array();
    public function __construct($jwt)
    {
        // harus di set per client
        $clientChipper='542346';
        $this->token=$this->unWrapToken($jwt,$clientChipper);
    }

    public function getToken(){
        return $this->token;
    }

    public function getErros(){
        return $this->errors;
    }

    private  function unWrapToken($jwt, $chipper)
    {
        try {
            if (strlen($chipper) <> 6) {
                throw new \ErrorException('chipper failed');
            }

            $headerPreffix  = (int) substr($chipper, 0, 1);
            $headerSuffix  = (int) substr($chipper, 1, 1);
            $payloadPreffix = (int) substr($chipper, 2, 1);
            $payloadSuffix  = (int) substr($chipper, 3, 1);
            $signPreffix    = (int) substr($chipper, 4, 1);
            $signSuffix    = (int) substr($chipper, 5, 1);

            $jwtPart       =  explode('.', $jwt);


            if (count($jwtPart) != 4) {
                throw new \ErrorException('token part invalid');
            }


            $newString = $this->removePreSuf($jwtPart[0], $headerPreffix, $headerSuffix);
            if ($newString == false) {
                throw new \ErrorException('failed clean wrapper header');
            }
            $header = $newString;

            $newString = $this->removePreSuf($jwtPart[1], $payloadPreffix, $payloadSuffix);
            if ($newString == false) {
                throw new \ErrorException('failed clean wrapper payload');
            }
            $payload = $newString;

            $newString = $this->removePreSuf($jwtPart[2], $signPreffix, $signSuffix);
            if ($newString == false) {
                throw new \ErrorException('failed clean wrapper sign');
            }
            $sign = $newString;

            return $header . '.' . $payload . '.' . $sign;
        } catch (\ErrorException $e) {
            array_push($this->errors,array($e->getMessage()));
            return false;
        }
    }

    private  function removePreSuf($string, $preffix, $suffix)
    {
        $jum = strlen(trim($string));
        $totWrapper = ($preffix + $suffix);
        $tot = $totWrapper  + 10; // set minimum text
        if ($jum > $tot) {
            $total = $jum - $totWrapper;
            $newString = substr($string, $preffix, $total);
            return $newString;
        }

        return false;
    }


}