Server-Side Sign in with Apple

Nov 15 2022 · Swift 5.6, macOS 12, iOS 15, Xcode 13.3

Part 1: Add Sign in with Apple to an iOS Project

04. Connect Your iOS App to Your Vapor App

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Previous episode: 03. Add Sign in with Apple to Your iOS App Next episode: 05. Authenticate Existing Users with Sign in with Apple

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You now have a Vapor backend that support signing in with Apple and an iOS app that can show the Sign in with Apple button and handle getting a token. It’s time to connect the two up!

Sending the Sign in with Apple token to the backend

First, open the TILiOS app in Xcode. Inside handleSIWA(result:) remove the error you added at the end of the last video to make it compile:

throw AuthError.notLoggedIn
let requestData = SignInWithAppleToken(token: tokenString, name: name, username:
let path = "\(apiHostname)/api/users/siwa"
guard let url = URL(string: path) else {
    fatalError("Failed to convert URL")
do {

} catch {
    self.showingLoginErrorAlert = true
    throw error
var loginRequest = URLRequest(url: url)
loginRequest.httpMethod = "POST"
loginRequest.httpBody = try JSONEncoder().encode(requestData)
loginRequest.setValue("application/json", forHTTPHeaderField: "Content-Type")
let (data, response) = try await loginRequest)
guard let httpResponse = response as? HTTPURLResponse, httpResponse.statusCode == 200 else {
    self.showingLoginErrorAlert = true
    throw AuthError.badResponse
return try JSONDecoder().decode(Token.self, from: data)

Running the Vapor app

In Terminal, navigate to your Vapor app. Execute the script to create a Postgres database in Docker:

swift Scripts/dockerDB.swift start
swift run