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[&#39;REQUEST_TIME&#39;],           
         "exp"       => $_SERVER[&#39;REQUEST_TIME&#39;] + 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 = &#39;secret&#39;)
    {
        return hash_hmac(&#39;sha256&#39;, $header.$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 $header . &#39;.&#39; .$payload . &#39;.&#39; . $signature;
    }    /**
     * check a token
     * @param $jwt
     * @param string $key
     * @return array|string
     */
    public static function checkToken($jwt, $key = &#39;secret&#39;)
    {
        $token = explode(&#39;.&#39;, $jwt);        
        if (count($token) != 3)           
         return &#39;token invalid&#39;;        
         list($header64, $payload64, $sign) = $token;        
         if (self::signature($header64 , $payload64) !== $sign)            
         return &#39;token invalid&#39;;        
         $header = json_decode(base64_decode($header64), JSON_OBJECT_AS_ARRAY);        
         $payload = json_decode(base64_decode($payload64), JSON_OBJECT_AS_ARRAY);        
         if ($header[&#39;type&#39;] != &#39;token&#39; || $header[&#39;alg&#39;] != &#39;HS256&#39;)            
         return &#39;token invalid&#39;;        
         if ($payload[&#39;iss&#39;] != &#39;http://api.creatshare.com&#39; || $payload[&#39;GivenName&#39;] != &#39;CreatShare&#39;)            
         return &#39;token invalid&#39;;        
         if (isset($payload[&#39;exp&#39;]) && $payload[&#39;exp&#39;] < time())            
         return &#39;timeout&#39;;        
         return [           
          &#39;memberId&#39; => $payload[&#39;memberId&#39;],            
         &#39;permission&#39; =>$payload[&#39;permission&#39;]
        ];
    }    /**
     * get a token
     * @return null
     */
    public static function getToken()
    {
        $token = null;        
        if (isset($_SERVER[&#39;HTTP_AUTHORIZATION&#39;]))            
        $token = $_SERVER[&#39;HTTP_AUTHORIZATION&#39;];        
        return $token;
    }
}

$token = Token::createToken($member_id, $member_permission); //创建一个
token$token = Token::getToken();    //从http请求头获取
token$result = Token::checkToken(); //解析token

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