Swift Vapor 4 身份验证问题 [用户未通过身份验证]

我有一个iOS客户端，使用OAuth 2.0作为身份验证机制.

当用户登录时，我使用此方法对其进行身份验证(例如，Google登录):

 func processGoogleLogin(request: Request, token: String) throws -> EventLoopFuture<ResponseEncodable> {
    try Google
        .getUser(on: request)
        .flatMap { userInfo in
            User
                .query(on: request.db)
                .filter(\.$email == userInfo.email)
                .first()
                .flatMap { foundUser in
                    guard let existingUser = foundUser else {
                        //creating a new user
                        return user
                            .save(on: request.db)
                            .map {
                                request.session.authenticate(user)
                                //redirecting with info
                            }
                    }
                    request.session.authenticate(existingUser)
                    //redirecting with info
                }
        }
}

登录后，我想判断用户是否通过了身份验证，以及我是否成功地对用户进行了身份验证. 因此，我有一个针对未经身份验证的用户保护的终结点，但即使在登录之后，该用户也无法访问此终结点，因为他未经过身份验证.

{
"error": true,
"reason": "User not authenticated."
}

我还使用SessionMiddleware(ImpreialController是身份验证控制器):

   let imperialController = ImperialController(sessionsMiddleware: app.sessions.middleware)
   app.middleware.use(app.sessions.middleware)

class ImperialController {
    private let sessionsMiddleware: Middleware
    
    init(sessionsMiddleware: Middleware) {
        self.sessionsMiddleware = sessionsMiddleware
    }
    ....

let protected = app.grouped(User.guardMiddleware())

protected.get { req -> HTTPResponseStatus in
    return .ok
}