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How to Integrate CustomAuth and apple logins

Introduction​

This tutorial will guide you on how to integrate CustomAuth with native apple logins, i.e., "Sign in with apple"

You can find the source code of this is example on Github.

Register your CustomAuth application​

In order to use Torus CustomAuth SDK, you'll need to create a project in Developer Dashboard

  1. Verifier type: "Custom"
  2. JWK endpoint - https://appleid.apple.com/auth/keys

Let's get started with code by installing depedency using SPM or Cocoapods​

TorusDirectSwiftSDK JWTDecode

Import SDKs​

Import TorusDirectSwiftSDK and JWTDecode where required using

import TorusSwiftDirectSDK
import JWTDecode
import AuthenticationServices

Add a Sign in with Apple Button button using ASAuthentication​

Apple documentation

func setupProviderLoginView() {
    let authorizationButton = ASAuthorizationAppleIDButton()
    authorizationButton.addTarget(self, action: #selector(handleAuthorizationAppleIDButtonPress), for: .touchUpInside)
    self.loginProviderStackView.addArrangedSubview(authorizationButton)
}

Request authorization on button click​

func handleAuthorizationAppleIDButtonPress() {
    let appleIDProvider = ASAuthorizationAppleIDProvider()
    let request = appleIDProvider.createRequest()
    request.requestedScopes = [.fullName, .email]

    let authorizationController = ASAuthorizationController(authorizationRequests: [request])
    authorizationController.delegate = self
    authorizationController.presentationContextProvider = self
    authorizationController.performRequests()
}

Add delegate methods to handle post authorization​

func authorizationController(controller: ASAuthorizationController, didCompleteWithAuthorization authorization: ASAuthorization) {
  switch authorization.credential {
    case let appleIDCredential as ASAuthorizationAppleIDCredential:

      // Create an account in your system.
      let userIdentifier = appleIDCredential.user

      // Get and decode the signed JWT toekn
      let token = String(data: appleIDCredential.identityToken!, encoding: .utf8)!
      let JWT = try? JWTDecode.decode(jwt: token)

      // Add different claims here.
      let claim = JWT?.claim(name: "sub")
      guard let sub = claim?.string else {
          print("sub missing")
          return
      }

      // initializeSDK
      let tdsdk = TorusSwiftDirectSDK(aggregateVerifierType: .singleLogin, aggregateVerifierName: "apple-native", subVerifierDetails: [], network: .ROPSTEN, loglevel: .error)
      tdsdk.getTorusKey(verifier: "apple-native", verifierId: sub, idToken: token).done{ data in
          // Data contains private and public key
          print(data)

          // Add segues to viewControllers here.
          let alert = UIAlertController(title: "Private Key", message: data["privateKey"] as? String, preferredStyle: UIAlertController.Style.alert)
          alert.addAction(UIAlertAction(title: "OK", style: UIAlertAction.Style.default, handler: nil))
          self.present(alert, animated: true, completion: nil)
      }.catch{ error in
          print(error)
      }
    default:
      break
  }
}

Conclusion​

You can use the above private key in your web3 SDK. Here's GIF from the example app.