func authorizationController()

in authentication/AuthenticationExample/ViewControllers/AuthViewController.swift [248:282]

• 26 lines of code
• 1 McCabe index (conditional complexity)

  func authorizationController(controller: ASAuthorizationController,
                               didCompleteWithAuthorization authorization: ASAuthorization) {
    guard let appleIDCredential = authorization.credential as? ASAuthorizationAppleIDCredential
    else {
      print("Unable to retrieve AppleIDCredential")
      return
    }

    guard let nonce = currentNonce else {
      fatalError("Invalid state: A login callback was received, but no login request was sent.")
    }
    guard let appleIDToken = appleIDCredential.identityToken else {
      print("Unable to fetch identity token")
      return
    }
    guard let idTokenString = String(data: appleIDToken, encoding: .utf8) else {
      print("Unable to serialize token string from data: \(appleIDToken.debugDescription)")
      return
    }

    let credential = OAuthProvider.credential(withProviderID: "apple.com",
                                              idToken: idTokenString,
                                              rawNonce: nonce)

    Auth.auth().signIn(with: credential) { result, error in
      // Error. If error.code == .MissingOrInvalidNonce, make sure
      // you're sending the SHA256-hashed nonce as a hex string with
      // your request to Apple.
      guard error == nil else { return self.displayError(error) }

      // At this point, our user is signed in
      // so we advance to the User View Controller
      self.transitionToUserViewController()
    }
  }