Server-Side Sign in with Apple

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

Part 2: Add Sign in with Apple to a Website

08. Handle the Sign in with Apple Callback

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Previous episode: 07. Add the Sign in with Apple Button to a Website Next episode: 09. Authenticate Sign in with Apple Users on the Web

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When a user signs in with Apple on the web, they authenticate with Apple servers.

func appleAuthCallbackHandler(_ req: Request) async throws -> View {

}

let siwaData = try req.content.decode(AppleAuthorizationResponse.self)

guard let sessionState = req.cookies["SIWA_STATE"]?.string, !sessionState.isEmpty, sessionState == siwaData.state else {
    req.logger.warning("SIWA does not exist or does not match")
    throw Abort(.unauthorized)
}

struct SIWAHandleContext: Encodable {
  let token: String
  let email: String?
  let firstName: String?
  let lastName: String?
}

let context = SIWAHandleContext(token: siwaData.idToken, email: siwaData.user?.email, firstName: siwaData.user?.name?.firstName, lastName: siwaData.user?.name?.lastName)
return try await req.view.render("siwaHandler", context)

authSessionsRoutes.post("login", "siwa", "callback", use: appleAuthCallbackHandler)

<!doctype html>
<html lang="en" class="h-100">
  <head>
    <!-- Required meta tags -->
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Sign in With Apple | Southdown Marketplace</title>
  </head>
  <body class="d-flex flex-column h-100">

  </body>
</html>

<script>
  function handleCallback() {
    const form = document.getElementById("siwaRedirectForm")
    form.style.display = 'none';
    form.submit();
  }
  window.onload = handleCallback;
</script>

<form action="/login/siwa/handle" method="POST" id="siwaRedirectForm">
    
</form>

<input type="hidden" name="token" value="#(token)">
<input type="hidden" name="email" value="#(email)">
<input type="hidden" name="firstName" value="#(firstName)">
<input type="hidden" name="lastName" value="#(lastName)">

<input type="submit" value="If nothing happens click here">