在 Swift 5 iOS 中调用 getIdToken 时未获取 Firebase 令牌 ID

Question

我已经尝试了 3 天来完成这项工作，但我看不到我要去哪里。当尝试使用 firebase 提供的 - (void)getIDTokenWithCompletion: (nullable void (^)(NSString *_Nullable __strong, NSError *_Nullable __strong))completion; 函数获取 firebase tokenId 时，我没有得到任何回报。

我创建了一个单独的类来使用完成处理程序获取 Id。下面是我正在使用的代码

import Foundation
import FirebaseAuth

class FirebaseToken  {
    static var shared = FirebaseToken.init()
    func getIdToken(token completion: @escaping(String?,Error?) -> Void){
        Auth.auth().currentUser?.getIDToken(completion:{ idToken, error in
            guard let error = error else {return }
            print(error)
            completion(nil, error)
            guard let token = idToken else {return}
            completion(token, nil)
            print(token)
        })

    }
}

这是我用来调用func getIdToken 函数以获取ID 的类，它位于func makeAPICall<T:Codable>(urlPath: String, apiMethod: HTTPMethod, expectedReturnType: T.Type,user completionHandler: @escaping ([T]?,Error?) 函数内部。

import Foundation
import Alamofire
import Firebase

class ApiService {
    
    static var shared = ApiService.init()
    
    let session: Session = {
        let manager = ServerTrustManager(allHostsMustBeEvaluated: false,evaluators: ["localhost": DisabledTrustEvaluator()])
        let configuration = URLSessionConfiguration.af.default
        
        return Session(configuration: configuration, serverTrustManager: manager)
    }()

    //MARK:- GET
    func makeAPICall<T:Codable>(urlPath: String, apiMethod: HTTPMethod, expectedReturnType: T.Type,user completionHandler: @escaping ([T]?,Error?) -> Void) {
        var urlComponent = URLComponents()
        urlComponent.scheme = "https"
        urlComponent.host = "localhost"
        urlComponent.port = 5001
        urlComponent.path = "/api/" + urlPath
        print(urlComponent.url!)
        guard let url = urlComponent.url else {
            return
        }
        
        var headers: HTTPHeaders?
        FirebaseToken.shared.getIdToken(token: {tokenId, error in
            guard let errors = error else {return}
            print(errors)
            guard let tokens = tokenId else {return}
            headers = [
                .authorization(bearerToken: tokens),
                .accept("application/json")
            ]
        })
        
        guard let headerAuth = headers else {
            print("not getting firebase token")
            return
        }
        print(headerAuth)
        session.request(url, method: apiMethod).validate().responseDecodable(of: [T].self) {(response) in
            switch response.result{
            case .success:
                guard let users = response.value else {
                    return
                }
                //print(header)
                completionHandler(users, nil)
            case .failure(let error):
                completionHandler(nil, error)
            }
        }
    }
}

函数内部的变量var headers: HTTPHeaders?

guard let headerAuth = headers else {
        print("not getting firebase token")
        return
    }

应该打印出令牌，由于某种原因，令牌没有被添加。有人可以让我知道我哪里出了问题，因为我被困了 3 天，而且我对 firebase 还是很陌生？

打印结果应该在print(headerAuth)以内，但是；我不断在print("not getting firebase token") 内获得结果

Answer 1

getIdToken 方法是一个异步调用。任何需要生成令牌的代码都需要在完成处理程序中。

比如：

FirebaseToken.shared.getIdToken(token: {tokenId, error in
    guard let tokens = tokenId else {return}
    headers = [
        .authorization(bearerToken: tokens),
        .accept("application/json")
    ]
    guard let headerAuth = headers else {
        print("not getting firebase token")
        return
    }

    session.request(url, method: apiMethod).validate().responseDecodable(of: [T].self) {(response) in
        switch response.result{
        case .success:
            guard let users = response.value else {
                return
            }
            completionHandler(users, nil)
        case .failure(let error):
            completionHandler(nil, error)
        }
    }

})

    

我也删除了这一行：

guard let errors = error else {return}

我很确定当出现 no 错误时，它会返回块外。