Trouble when starting a Livenesscheck at IOS 18

[francisco-sanabria-itti]

Describe the bug

When executing the liveness feature in AWS Amplify, the process fails with an "An unknown error occurred" message. This occurs consistently and prevents further execution of the feature. There is no detailed error information provided in the logs, making it challenging to identify the root cause.

Steps To Reproduce

This is my code:

//App delegate 
import UIKit
import Flutter
import Amplify
import AWSCognitoAuthPlugin

@main
@objc class AppDelegate: FlutterAppDelegate {
  override func application(
    _ application: UIApplication,
    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
  ) -> Bool {
    
      // Flutter Method Channel Setup
      let controller: FlutterViewController = window?.rootViewController as! FlutterViewController
      let methodChannel = FlutterMethodChannel(name: "LIVE_VERIFICATION_CHANNEL", binaryMessenger: controller.binaryMessenger)
      methodChannel.setMethodCallHandler { [weak self] (call, result) in
          if call.method == "startLiveVerification" {
              guard let args = call.arguments as? [String: Any],
                    let sessionId = args["sessionId"] as? String else {
                  result(FlutterError(code: "INVALID_ARGUMENT", message: "Invalid session Id", details: nil))
                  return
              }
              print("session id is \(sessionId)")
              let faceLivenessController = FaceLiveDetectionController()
              faceLivenessController.sessionId = sessionId
              faceLivenessController.flutterResult = result
              faceLivenessController.modalPresentationStyle = .fullScreen
              controller.present(faceLivenessController, animated: true, completion: nil)
          } else {
              result(FlutterMethodNotImplemented)
          }
      }

      // Notification Center (if needed)
      if #available(iOS 10.0, *) {
          UNUserNotificationCenter.current().delegate = self as UNUserNotificationCenterDelegate
      }

      // Register generated plugins
      GeneratedPluginRegistrant.register(with: self)

      return super.application(application, didFinishLaunchingWithOptions: launchOptions)
  }
}

// Liveness controller

import FaceLiveness
import Foundation
import SwiftUI
import UIKit

class FaceLiveDetectionController: UIViewController {
    var sessionId: String?
    var flutterResult: FlutterResult!
    var hostingController: UIHostingController<FaceLivenessDetectorView>?
    override func viewDidLoad() {
        super.viewDidLoad()
        configureFaceDetection()
    }
    private func configureFaceDetection() {
        if let sessionID = self.sessionId {
            let faceView = FaceLivenessDetectorView(
                sessionID: "<SESSION_ID>",
                credentialsProvider: MyCredentialsProvider(),
                region: "<REGION>",
                isPresented: .constant(true),
                onCompletion: { result in
                    DispatchQueue.main.async {
                        switch result {
                        case .success:
                            self.callback("success")
                        case .failure(let error):
                            self.callback(error.message)
                        }
                    }
                })
            hostingController = createHostingController(with: faceView)
            addHostingControllerAsChild(hostingController!)
            configureConstraints(for: hostingController!.view)
        }

    }

    private func callback(_ res: String) {
        hostingController?.dismiss(animated: true, completion: nil)
        if res == "success" {
            flutterResult("success")
        } else {
            flutterResult(FlutterError(code: "error", message: res, details: nil))
        }

    }

    private func createHostingController(with rootView: FaceLivenessDetectorView)
        -> UIHostingController<FaceLivenessDetectorView>
    {
        return UIHostingController(rootView: rootView)
    }

    private func addHostingControllerAsChild(
        _ hostingController: UIHostingController<FaceLivenessDetectorView>
    ) {
        addChild(hostingController)
        view.addSubview(hostingController.view)
    }

    private func configureConstraints(for view: UIView) {
        view.translatesAutoresizingMaskIntoConstraints = false
        NSLayoutConstraint.activate([
            view.topAnchor.constraint(equalTo: self.view.topAnchor, constant: 10),
            view.bottomAnchor.constraint(equalTo: self.view.bottomAnchor),
            view.leadingAnchor.constraint(equalTo: self.view.leadingAnchor),
            view.trailingAnchor.constraint(equalTo: self.view.trailingAnchor),
        ])
    }
}

//My credentials Provider

import AWSPluginsCore
import Amplify

struct MyTemporaryCredentials: AWSTemporaryCredentials {
    let accessKeyId: String
    let secretAccessKey: String
    let sessionToken: String
    let expiration: Date
}

struct MyCredentialsProvider: AWSCredentialsProvider {
    func fetchAWSCredentials() async throws -> AWSCredentials {
        // Aquí simulas la obtención de credenciales
        return MyTemporaryCredentials(
            accessKeyId: "<ACCESS_KEY_HERE>",
            secretAccessKey: "<SECRET_ACCESS_KEY>",
            sessionToken: "",
            expiration: Date().addingTimeInterval(100000) // 1 hora de validez
        )
    }
}

I started application and the camera was open, then when I started liveness check, camera finished and the logs register this: 

Error creating the CFMessagePort needed to communicate with PPT.
Connection 1: received failure notification
flutter: Error in starting live verification: An unknown error occurred.

Expected behavior

Finish process successfuly.

Swift Liveness Version

2.42.1

Xcode version

16.2 (16C5032a)

Relevant log output

<details>
<summary>Log Messages</summary>

Error creating the CFMessagePort needed to communicate with PPT.
Connection 1: received failure notification
flutter: Error in starting live verification: An unknown error occurred.

</details>

Is this a regression?

No

Regression additional context

No response

OS Version

iOS 18.2 / MacOS 15.2

Device

IPhone 14

Specific to simulators

No response

Additional context

No response

[sebaland]

Hi @francisco-sanabria-itti, thanks for reaching out.
We've seen this error happening when you provide temporary credentials but use the AWSCredentialsProvider protocol instead of AWSTemporaryCredentials.
Based on your code snippet, that seems to be the case, as you should provide MyTemporaryCredentials() to the FaceLivenessDetectorView initializer.

EDIT: I misread your code and I now see you are indeed providing MyTemporaryCredentials. But are you correctly populating all of its fields? It seems you are leaving the sessionToken as an empty string.
If you are actually providing static credentials, then you should make MyTemporaryCredentials conform to AWSCredentials instead.

If this is not the root cause of your issue, please enable verbose logging and share them with us, as they might provide additional helpful information. You can enable verbose loggings by doing the following before calling Amplify.configure():

Amplify.Logging.logLevel = .verbose

[francisco-sanabria-itti]

Thank you so much! It solved my problem!! ❤️

[github-actions]

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