jwt组件安装

composer require lcobucci/jwt 3.3 jwt封装

<?php
namespace tools\jwt; //命名空间

use Lcobucci\JWT\Builder;
use Lcobucci\JWT\Parser;
use Lcobucci\JWT\Signer\Hmac\Sha256;
use Lcobucci\JWT\ValidationData;

/**
 * Created by PhpStorm.
 * User: asus
 * Date: 2019/4/5
 * Time: 13:02
 */
class Token
{
    private static $_config = [
        'audience' => 'http://www.tp.com', //接收人
        'id' => '3f2g57a92aa',
        'sign' => 'pinyougou',//签名密钥
        'issuer' => 'http://www.tp.com',//签发人
        'expire' => 3600*24, //有效期
    ];

    //生成token
    public static function getToken($user_id){

        //签名对象
        $signer = new Sha256();

        //获取当前时间戳
        $time = time();
        //设置签发人、接收人、唯一标识、签发时间、立即生效、过期时间、用户id、签名
        $token = (new Builder())->issuedBy(self::$_config['issuer'])
            ->canOnlyBeUsedBy(self::$_config['audience'])
            ->identifiedBy(self::$_config['id'], true)
            ->issuedAt($time)
            ->canOnlyBeUsedAfter($time-1)
            ->expiresAt($time + self::$_config['expire'])
            ->with('user_id', $user_id)
            ->sign($signer, self::$_config['sign'])
            ->getToken();
        return (string)$token;
    }

    //从请求信息中获取token令牌
    public static function getRequestToken()
    {
        if (empty($_SERVER['HTTP_AUTHORIZATION'])) {
            return false;
        }

        $header = $_SERVER['HTTP_AUTHORIZATION'];
        $method = 'bearer';
        //去除token中可能存在的bearer标识
        return trim(str_ireplace($method, '', $header));
    }

    //从token中获取用户id （包含token的校验）
    public static function getUserId($token = null)
    {
        $user_id = 0;

        $token = empty($token)?self::getRequestToken():$token;

        if (!empty($token)) {
            //为了注销token 加以下if判断代码
            $delete_tokens = cache('delete_token') ?: [];
            if(in_array($token, $delete_tokens)){
                //token已被删除（注销）
                return false;
            }

            $tokenObj = (new Parser())->parse((string) $token);
            //验证token
            $data = new ValidationData();
            $data->setIssuer(self::$_config['issuer']);//验证的签发人
            $data->setAudience(self::$_config['audience']);//验证的接收人
            $data->setId(self::$_config['id']);//验证token标识

            if (!$tokenObj->validate($data)) {
                //token验证失败
                return false;
            }

            //验证签名
            $signer = new Sha256();
            if (!$tokenObj->verify($signer, self::$_config['sign'])) {
                //签名验证失败
                return false;
            }
            //从token中获取用户id
            $user_id = $tokenObj->getClaim('user_id');
        }

        return $user_id;
    }
}