向每个AlamoFire请求添加带有完成处理程序的Firebase IdToken

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我的复杂之处在于使用Firebase API获取承载令牌,因为它有一个完成处理程序在承载令牌过期的情况下,刷新令牌用于尝试获取新的承载令牌:

static func getIdToken(completion: @escaping (String?, Error?) -> Swift.Void) {
    guard let user =  Auth.auth().currentUser else {
        print("No Firebase User!")
        completion(nil, nil)
        return
    }

    user.getIDToken { (idToken, error) in
        if(error != nil ) {
            print("AuthUtiltiy, error retrieving token: \(error!.localizedDescription)")
            completion(nil, error)
            return
        }

        completion(idToken, nil);
    }
}

private var manager = Alamofire.SessionManager.default

// Setups the cookie and shared instance
override init() {
    let defaultHeaders = manager.session.configuration.httpAdditionalHeaders ?? [:]
    let configuration = URLSessionConfiguration.default
    configuration.httpAdditionalHeaders = defaultHeaders
    manager = Alamofire.SessionManager(configuration: configuration)
}

RequestAdapter , introduced in AlamoFire 4.0 又是因为同样的原因Firebase.getIdToken回调/完成处理程序。