如何從iOS應用中的Node.js服務器獲取響應？

Question

我有一個Node.js服務器，當用戶登錄時，該服務器發送JWT（JSON Web令牌）作為響應。如何在我的Swift 4 iOS應用中獲取響應？

func handleLogin() {

    guard let username = usernameTextField.text, let password = 
    passwordTextField.text else {
        print("Invalid form")
        return
    }

    guard let url = URL(string: "http://localhost:3000/users/authenticate") 
    else { return }

    var request = URLRequest(url: url)
    request.httpMethod = "POST"
    request.addValue("application/json", forHTTPHeaderField: "Content-Type")

    let authUser = Login(username: username, password: password)
    do {
        let jsonBody = try JSONEncoder().encode(authUser)
        request.httpBody = jsonBody
    } catch {}

    let session = URLSession.shared
    let task = session.dataTask(with: request)

    task.resume()
}

它將用戶名和密碼發送到服務器，但是從這里如何獲得響應？ 響應是一個JWT令牌，如何將其存儲在哪里？

這是結構。

struct Login: Encodable {
    let username: String
    let password: String
}

struct User: Decodable {
    let id: Int
    let username: String
    let email: String
}

struct Response: Decodable {
    let token: String
    let user: User
}

Answer 1

根據帖子，我猜您的回復將采用以下格式：

{
    "token": "JWT 2424234234234",
    "user": {
        "id": 1,
        "username": "user.username",
        "email": "user.email"
    }
}    

對於上述JSON，您必須像下面這樣進行解碼：

struct Response: Codable {
    let token: String
    let user: User
}
struct User: Codable {
    let id: Int
    let username: String
    let email: String
}

let session = URLSession.shared
let task = session.dataTask(with: request) { (data, _, _) in
    guard let data = data else { return }
    do {
        let sentPost = try JSONDecoder().decode(Response.self, from: data)
        print(sentPost.token)
        print(sentPost.user.id)
        print(sentPost.user.username)
        print(sentPost.user.email)
    } catch {}
}
task.resume()

Answer 2

let session = URLSession.shared
    let task = session.dataTask(with: request) { (data, _, _) in
        guard let data = data else { return }
        do {
            let _ = try JSONDecoder().decode(Response.self, from: data)
        } catch {
            print(String(data: data, encoding: .utf8)!)
        }
    }
    task.resume()