class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine(RequestToken());
            Console.ReadLine();
        }

        private static string RequestToken()
        {
            ServicePointManager.ServerCertificateValidationCallback +=
            (sender, certificate, chain, sslPolicyErrors) => true;

            var client1 = new RestClient();
            client1.Authenticator = new HttpBasicAuthenticator("username", "password");
            var request = new RestRequest(@"https://mysts.issuer.url" + @"?realm=https://myacsaddress.accesscontrol.windows.net", Method.GET);
             var response1 = client1.Execute(request);
            var samlToken = response1.Content;
            NameValueCollection oauthToken;

            oauthToken = GetOAuthToken(samlToken, "https://myacsaddress.accesscontrol.windows.net",
                                             "http://127.0.0.1:7000/");

            var oauthAuthorizationHeader = string.Format("Wrap {0}", oauthToken["access_token"]);
            var client3 = new RestClient();
            var request3 = new RestRequest(@"http://127.0.0.1:7000/", Method.POST);
            request3.AddHeader(HttpRequestHeader.ContentType.ToString(), "application/x-www-form-urlencoded");
            request3.AddBody(oauthAuthorizationHeader);
            var response3 = client3.Execute(request3);
            return response3.Content;
        }

        private static NameValueCollection GetOAuthToken(string xmlSamlToken, string serviceEndpoint, string acsRelyingParty)
        {
            var values = new NameValueCollection
                             {
                                 { "grant_type", "urn:oasis:names:tc:SAML:2.0:assertion" },
                                 { "assertion", xmlSamlToken },
                                 { "scope", acsRelyingParty }

                             };
            var client = new WebClient { BaseAddress = serviceEndpoint };
            byte[] acsTokenResponse = client.UploadValues("v2/OAuth2-13", "POST", values);
            string acsToken = Encoding.UTF8.GetString(acsTokenResponse);
            var tokens = new NameValueCollection();
            var json = new JavaScriptSerializer();
            var parsed = json.DeserializeObject(acsToken) as Dictionary<string, object>;
            foreach (var item in parsed)
            {
                tokens.Add(item.Key, item.Value.ToString());
            }

            return tokens;
        }
    }