php自定义token类并将生成的token放在http请求头的Authorization中的代码

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今天在使用laravel写东西的时候，需要与前端交互，看了jwt(json web token)，于是自己想试着写一个简单的token类，token中存储了成员id和成员的权限，与前端交互时，将生成的token放在http请求头的Authorization中，整理如下：

<?php
namespace App\Http\Controllers\Auth;
use Illuminate\Http\Request;
use App\Http\Controllers\Controller;
class TokenController extends Controller{
    /**
     * header
     * @var array
     */
    private static $header = [        
    "type" => "token",        
    "alg"  => "HS256"
    ];    /**
     * create payload
     * @param $memberId
     * @param $permission
     * @return array
     */
    private static function payload($memberId, $permission)
    {
        return [            
        "iss"       => "http://api.creatshare.com",            
        "iat"       => $_SERVER['REQUEST_TIME'],           
         "exp"       => $_SERVER['REQUEST_TIME'] + 7200,            
         "GivenName" => "CreatShare",            
         "memberId"  => $memberId,            
         "permission"=> $permission
        ];
    }    /**
     * encode data
     * @param $data
     * @return string
     */
    private static function encode($data)
    {
        return base64_encode(json_encode($data));
    }    /**
     * generate a signature
     * @param $header
     * @param $payload
     * @param string $secret
     * @return string
     */
    private static function signature($header, $payload, $secret = 'secret')
    {
        return hash_hmac('sha256', $header.$payload, $secret);
    }    /**
     * generate a token
     * @param $memberId
     * @param $permission
     * @return string
     */
    public static function createToken($memberId, $permission)
    {
        $header = self::encode(self::$header);        
        $payload = self::encode(self::payload($memberId, $permission));        
        $signature = self::signature($header, $payload);        
        return $header . '.' .$payload . '.' . $signature;
    }    /**
     * check a token
     * @param $jwt
     * @param string $key
     * @return array  string
     */
    public static function checkToken($jwt, $key = 'secret')
    {
        $token = explode('.', $jwt);        
        if (count($token) != 3)           
         return 'token invalid';        
         list($header64, $payload64, $sign) = $token;        
         if (self::signature($header64 , $payload64) !== $sign)            
         return 'token invalid';        
         $header = json_decode(base64_decode($header64), JSON_OBJECT_AS_ARRAY);        
         $payload = json_decode(base64_decode($payload64), JSON_OBJECT_AS_ARRAY);        
         if ($header['type'] != 'token'      $header['alg'] != 'HS256')            
         return 'token invalid';        
         if ($payload['iss'] != 'http://api.creatshare.com'      $payload['GivenName'] != 'CreatShare')            
         return 'token invalid';        
         if (isset($payload['exp']) && $payload['exp'] < time())            
         return 'timeout';        
         return [           
          'memberId' => $payload['memberId'],            
         'permission' =>$payload['permission']
        ];
    }    /**
     * get a token
     * @return null
     */
    public static function getToken()
    {
        $token = null;        
        if (isset($_SERVER['HTTP_AUTHORIZATION']))            
        $token = $_SERVER['HTTP_AUTHORIZATION'];        
        return $token;
    }
}