关于php中使用JWT做接口验证

水深无声 2022-12-19 06:08 121阅读 0赞

<?php
    /** * token验证类 * Created by PhpStorm. * User: Administrator * Date: 2020/10/13 * Time: 14:14 */
    
    namespace app\jwt;
    
    use app\common\ApiResponse;
    use app\common\InformationGroup;
    
    class JwtService
    { 
    
        private static $header = array(
            'alg' => 'HS256',
            'typ' => 'JWT'
        );
    
    
        private static $key = '123456';
    
    
        /** * 生成token * @param $payload * @return bool|string */
        public static function getToken($payload)
        { 
            if (is_array($payload)) { 
                $base64header = self::base64UrlEncode(json_encode(self::$header, JSON_UNESCAPED_UNICODE));
                $base64payload = self::base64UrlEncode(json_encode($payload, JSON_UNESCAPED_UNICODE));
                $token = $base64header . '.' . $base64payload . '.' . self::signature($base64header . '.'
                        . $base64payload, self::$key, self::$header['alg']);
                return $token;
            } else { 
                return false;
            }
        }
    
    
        /** * 验证token * @param $Token * @return mixed */
        public static function verifyToken($Token)
        { 
            $tokens = explode('.', $Token);
            if (count($tokens) != 3) { 
                ApiResponse::result(InformationGroup::TOKEN_ERROR_ONE);
            }
            list($base64header, $base64payload, $sign) = $tokens;
            $base64decodeheader = json_decode(self::base64UrlDecode($base64header), JSON_OBJECT_AS_ARRAY);
            if (empty($base64decodeheader['alg'])) { 
                ApiResponse::result(InformationGroup::ALGORITHM);
            }
            if (self::signature($base64header . '.' . $base64payload, self::$key, $base64decodeheader['alg']) !== $sign) { 
                ApiResponse::result(InformationGroup::SIGNATURE);
            }
            $payload = json_decode(self::base64UrlDecode($base64payload), JSON_OBJECT_AS_ARRAY);
            if (isset($payload['iat']) && $payload['iat'] > time()) { 
                ApiResponse::result(InformationGroup::IAT_TIME);
            }
            if (isset($payload['exp']) && $payload['exp'] < time()) { 
                ApiResponse::result(InformationGroup::EXP_TIME);
            }
            if (isset($payload['nbf']) && $payload['nbf'] > time()) { 
                ApiResponse::result(InformationGroup::NBF_TIME);
            }
            return $payload;
        }
    
    
        /** * 编码 * @param $input * @return mixed */
        private static function base64UrlEncode($input)
        { 
            return str_replace('=', '', strtr(base64_encode($input), '+/', '-_'));
        }
    
        /** * 解码 * @param $input * @return bool|string */
        private static function base64UrlDecode($input)
        { 
            $remainder = strlen($input) % 4;
            if ($remainder) { 
                $addlen = 4 - $remainder;
                $input .= str_repeat('=', $addlen);
            }
            return base64_decode(strtr($input, '-_', '+/'));
        }
    
        /** * 签名 * @param $input * @param $key * @param string $alg * @return mixed */
        private static function signature($input, $key, $alg = 'HS256')
        { 
            $alg_config = array(
                'HS256' => 'sha256'
            );
            return self::base64UrlEncode(hash_hmac($alg_config[$alg], $input, $key, true));
        }
    }