Not getting Firebase token id when calling getIdToken in Swift 5 iOS - swift

Question

I have been trying to make this work for 3 days now, and I can't see where I am going. When trying to get firebase tokenId using the - (void)getIDTokenWithCompletion: (nullable void (^)(NSString *_Nullable __strong, NSError *_Nullable __strong))completion; function provided by firebase I am getting nothing in return.
I have created a separate class to get the Id using a completion handler. Below is the code I am using
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)
})
}
}
This is the class I am using to call the func getIdToken function to get the Id, which is inside the func makeAPICall<T:Codable>(urlPath: String, apiMethod: HTTPMethod, expectedReturnType: T.Type,user completionHandler: #escaping ([T]?,Error?) function.
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)
}
}
}
}
the variable var headers: HTTPHeaders?, which inside the function
guard let headerAuth = headers else {
print("not getting firebase token")
return
}
should be printing out the token yet, for some reason the token isn't being added. Can someone let me know where I am going wrong as I have been stuck for 3 days and I am still very new to firebase?
The printing result should be within print(headerAuth), however; I keep on getting the result within print("not getting firebase token")

Answer 1

The getIdToken method is an asynchronous call. Any code that needs the resulting token, needs to be inside the completion handler.
So something like:
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)
}
}
})
I also removed this line:
guard let errors = error else {return}
As I'm pretty sure this returns out of the block when there is no error.