Laravel_api_init/app/Http/Middleware/Api/RefreshTokenMiddleware.php

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<?php
namespace App\Http\Middleware\Api;
use App\Jobs\Api\SaveLastTokenJob;
use Auth;
use Closure;
use Tymon\JWTAuth\Exceptions\JWTException;
use Tymon\JWTAuth\Exceptions\TokenInvalidException;
use Tymon\JWTAuth\Facades\JWTAuth;
use Tymon\JWTAuth\Http\Middleware\BaseMiddleware;
use Tymon\JWTAuth\Exceptions\TokenExpiredException;
use Symfony\Component\HttpKernel\Exception\UnauthorizedHttpException;
// 注意,我们要继承的是 jwt 的 BaseMiddleware
class RefreshTokenMiddleware extends BaseMiddleware
{
/**
* Handle an incoming request.
*
* @param \Illuminate\Http\Request $request
* @param \Closure $next
*
* @throws \Symfony\Component\HttpKernel\Exception\UnauthorizedHttpException
*
* @return mixed
*/
public function handle($request, Closure $next)
{
// 检查此次请求中是否带有 token如果没有则抛出异常。
$this->checkForToken($request);
//1. 格式通过验证是否是专属于这个的token
//获取当前守护的名称
$present_guard = Auth::getDefaultDriver();
//获取当前token
$token=Auth::getToken();
//即使过期了也能获取到token里的 载荷 信息。
$payload = Auth::manager()->getJWTProvider()->decode($token->get());
//如果不包含guard字段或者guard所对应的值与当前的guard守护值不相同
//证明是不属于当前guard守护的token
if(empty($payload['guard'])||$payload['guard']!=$present_guard){
throw new TokenInvalidException();
}
//使用 try 包裹,以捕捉 token 过期所抛出的 TokenExpiredException 异常
//2. 此时进入的都是属于当前guard守护的token
try {
// 检测用户的登录状态,如果正常则通过
if ($this->auth->parseToken()->authenticate()) {
return $next($request);
}
throw new UnauthorizedHttpException('jwt-auth', '未登录');
} catch (TokenExpiredException $exception) {
// 此处捕获到了 token 过期所抛出的 TokenExpiredException 异常,我们在这里需要做的是刷新该用户的 token 并将它添加到响应头中
try {
// 刷新用户的 token
$token = $this->auth->refresh();
// 使用一次性登录以保证此次请求的成功
Auth::onceUsingId($this->auth->manager()->getPayloadFactory()->buildClaimsCollection()->toPlainArray()['sub']);
//刷新了token将token存入数据库
$user = Auth::user();
SaveLastTokenJob::dispatch($user,$token);
} catch (JWTException $exception) {
// 如果捕获到此异常,即代表 refresh 也过期了,用户无法刷新令牌,需要重新登录。
throw new UnauthorizedHttpException('jwt-auth', $exception->getMessage());
}
}
// 在响应头中返回新的 token
return $this->setAuthenticationHeader($next($request), $token);
}
}