Updated iOSClient ViewController to work with IdentityServer4 demo for IdentityModel.OidcClient.Samples

ViewController.cs

using System;
using System.Text;
using IdentityModel.OidcClient;

using UIKit;
using Foundation;
using System.Net.Http;
using Newtonsoft.Json.Linq;

namespace iOSClient
{
    public partial class ViewController : UIViewController
    {
        SafariServices.SFSafariViewController safari;
        OidcClient _client;
        AuthorizeState _state;
        HttpClient _apiClient;

        public ViewController (IntPtr handle) : base (handle)
        {
        }

        public override void ViewDidLoad ()
        {
            base.ViewDidLoad ();

            CallApiButton.Enabled = false;

            LoginButton.TouchUpInside += LoginButton_TouchUpInside;
            CallApiButton.TouchUpInside += CallApiButton_TouchUpInside;
        }

        async void LoginButton_TouchUpInside (object sender, EventArgs e)
        {
            var authority = "https://demo.identityserver.io";

            var options = new OidcClientOptions (
                authority,
                "native.hybrid",
                "secret",
                "openid profile email api",
                "io.identitymodel.native://callback");

            _client = new OidcClient (options);
            _state = await _client.PrepareLoginAsync ();


            AppDelegate.CallbackHandler = HandleCallback;
            safari = new SafariServices.SFSafariViewController (new NSUrl (_state.StartUrl));

            this.PresentViewController (safari, true, null);
        }

        async void CallApiButton_TouchUpInside (object sender, EventArgs e)
        {
            if (_apiClient == null) {
                return;
            }

            var result = await _apiClient.GetAsync ("identity");

            var content = await result.Content.ReadAsStringAsync ();

            if (!result.IsSuccessStatusCode) {
                OutputTextView.Text = result.ReasonPhrase + "\n\n" + content;
                return;
            }

            OutputTextView.Text = JArray.Parse (content).ToString ();
        }

        async void HandleCallback (string url)
        {
            await safari.DismissViewControllerAsync (true);

            var result = await _client.ValidateResponseAsync (url, _state);

            var sb = new StringBuilder (128);
            foreach (var claim in result.Claims) {
                sb.AppendFormat ("{0}: {1}\n", claim.Type, claim.Value);
            }

            sb.AppendFormat ("\n{0}: {1}\n", "refresh token", result.RefreshToken);
            sb.AppendFormat ("\n{0}: {1}\n", "access token", result.AccessToken);

            OutputTextView.Text = sb.ToString ();

            _apiClient = new HttpClient ();
            _apiClient.SetBearerToken (result.AccessToken);
            _apiClient.BaseAddress = new Uri ("https://api.identityserver.io");

            CallApiButton.Enabled = true;
        }

        public override void DidReceiveMemoryWarning ()
        {
            base.DidReceiveMemoryWarning ();
            // Release any cached data, images, etc that aren't in use.
        }
    }
}