Consuming VS Online REST API using a Service Account

Program

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net;
using System.Net.Http;
using System.Diagnostics;
using System.Net.Http.Headers;
using Newtonsoft;
using Newtonsoft.Json;
using Newtonsoft.Json.Converters;
using Newtonsoft.Json.Serialization;
using Newtonsoft.Json.Utilities;
using Newtonsoft.Json.Linq;

namespace VsoRestAPiWithServiceAccount
{
    class Program
    {
        static void Main(string[] args)
        {

            Console.WriteLine("Main start");
            Task t = AsyncMain();
            t.ContinueWith((str) =>
            {
                Console.WriteLine(str.Status.ToString());
                Console.WriteLine("Main end");
            });
            t.Wait();

        }

        public static async Task AsyncMain()
        {

            string accountName = "your account goes here";
            string urlAccount = string.Format("https://{0}.visualstudio.com", accountName);
            string serviceAccountUsername = "your service account username goes here";
            string servviceAccountPassword = "your service account password goes here";

            //1 - Hit VSOnline unauthenticated
            var client = HttpClientFactory.Create(new HttpClientHandler() { AllowAutoRedirect = false });

            var resp = await client.GetAsync(urlAccount, HttpCompletionOption.ResponseHeadersRead);
            Console.WriteLine("Status Code = " + resp.StatusCode);
            Debug.Assert(resp.StatusCode == HttpStatusCode.Redirect);

            if (!resp.Headers.Contains("x-tfs-fedauthrealm") || 
                !resp.Headers.Contains("x-tfs-fedauthissuer"))
            {
                Console.WriteLine("Cannot determine federation data");
                return;
            }

            string realm = resp.Headers.GetValues("x-tfs-fedauthrealm").First();
            string issuer = resp.Headers.GetValues("x-tfs-fedauthissuer").First();

            Console.WriteLine("Federation Data:Realm={0}; Issuer={1}", realm, issuer);

            //2 - Get an access token from ACS using WRAP protocol
            string acsHost = new Uri(issuer).Host;
            string acsRequestTokenUrl = string.Format("https://{0}/WRAPv0.9", acsHost);
            resp = await client.PostAsync(acsRequestTokenUrl, new FormUrlEncodedContent(
                new KeyValuePair<string, string>[] {
                    new KeyValuePair<string, string>("wrap_scope", realm),
                    new KeyValuePair<string, string>("wrap_name", serviceAccountUsername),
                    new KeyValuePair<string, string>("wrap_password", servviceAccountPassword)
                }
            ));

            resp.EnsureSuccessStatusCode();
            var acsTokenData = await resp.Content.ReadAsFormDataAsync();
            var accessToken = acsTokenData["wrap_access_token"];
            var accessTokenExpiredInSecs = int.Parse(acsTokenData["wrap_access_token_expires_in"]);
            Console.WriteLine("Your access token expires in {0}: {1}", 
                accessTokenExpiredInSecs, 
                accessToken);

            //3 - Let's use the access token to consumer the REST api
            var request = new HttpRequestMessage(
                HttpMethod.Get,  
                urlAccount + "/DefaultCollection/_apis/projects?api-version=1.0-preview.1");

            request.Headers.Authorization = new AuthenticationHeaderValue(
                "WRAP",
                string.Format("access_token=\"{0}\"", accessToken));


            resp =  await client.SendAsync(request);
            resp.EnsureSuccessStatusCode();

            JObject jsonResult = await resp.Content.ReadAsAsync<JObject>();
            var projects = jsonResult.SelectTokens("$.value[*].name");
            Console.WriteLine("Here is the list of your pojects");
            foreach (var p in projects)
            {
                Console.WriteLine(p);
            }

        }


    }
}