DeviceCheck Example Implementation for Validating Device Authenticity on iOS

DeviceCheck.swift

import Foundation
import RxSwift
import DeviceCheck

public struct Client {
    
    private static func retrieveDeviceToken() -> Observable<String?> {
        if #available(iOS 11.0, *) {
            return Observable.create({ observer -> Disposable in
                guard DCDevice.current.isSupported else {
                    observer.onNext(nil)
                    observer.onCompleted()
                    return Disposables.create()
                }
                DCDevice.current.generateToken { (data, error) in
                    if error != nil {
                        observer.onNext(nil)
                        observer.onCompleted()
                    }
                    guard let data = data else {
                        observer.onNext(nil)
                        observer.onCompleted()
                        return
                    }
                    observer.onNext(data.base64EncodedString())
                    observer.onCompleted()
                }
                return Disposables.create()
            })
        }
        return Observable.just(nil)
    }
    
    public static func executeSomeRequest() -> Observable<ResponseModel> {
        return retrieveDeviceToken().flatMap { deviceToken -> Observable<ResponseModel> in
            return createRequest(with: deviceToken)
        }
    }

    public static func createRequest(with deviceToken: String?) -> Observable<ResponseModel> {
        // to be implemented
        // e.g. set token as header such as "Device-Check-Token"
    }
    
}