สร้าง Web API สำหรับส่ง iOS Push Notification ด้วย dotAPNS

using System.Net.Http;
using System.Web.Http;
using System.Threading.Tasks;
using System.Configuration;
using dotAPNS;
using System.Web;
using System;

namespace APNsService.Controllers
{
    [RoutePrefix("api")]
    public class MainController : ApiController
    {
        [Route("SendPush")]
        [AcceptVerbs("GET", "POST")]
        public async Task<ApnsResponse> SendPush(string title, string body, string token, string category)
        {
            try
            {
                //อ่านค่า CertContent หรือ CertFilePart, BundleID, KeyID,TeamID มาจาก ไฟล์ web.config
                string certContent = ConfigurationManager.AppSettings["CertContent"];
                string certFilePath = ConfigurationManager.AppSettings["CertFilePath"];
                string bundleId = ConfigurationManager.AppSettings["BundleId"];
                string keyId = ConfigurationManager.AppSettings["KeyId"];
                string teamId = ConfigurationManager.AppSettings["TeamId"];

                //สร้าง Option สำหรับ Token
                var options = new ApnsJwtOptions()
                {
                    CertContent = certContent,
                    BundleId = bundleId,
                    KeyId = keyId,
                    TeamId = teamId
                };

                //สร้าง Token
                var apns = ApnsClient.CreateUsingJwt(new HttpClient(new WinHttpHandler()), options);

                //สร้าง Push Object
                var push = new ApplePush(ApplePushType.Alert)
                    .AddAlert(HttpUtility.UrlDecode(title), HttpUtility.UrlDecode(body))//ข้อความแจ้งเตือน
                    .AddBadge(0)//แสดงจำนวนแจ้งเตือนที่หน้าแอปพลิเคชัน
                    .AddCategory(category)//กำหนดกลุ่มของการแจ้งเตือน
                    .AddToken(token);//token
                
                //ส่ง Notification
                return await apns.Send(push);
            }
            catch (Exception ex)
            {
                return ApnsResponse.Error(ApnsResponseReason.Unknown, ex.Message + ex.StackTrace);
            }
        }
    }
}

using System;
using System.IO;
using System.Configuration;
using System.Net;
using Newtonsoft.Json;

namespace APNsService
{
    public partial class Main : System.Web.UI.Page
    {
        string token = string.Empty;
        string baseUrl = string.Empty;

        protected void Page_Load(object sender, EventArgs e)
        {
            token = ConfigurationManager.AppSettings["apiToken"].ToString();
            baseUrl = string.Format("{0}://{1}{2}/", Request.Url.Scheme, Request.Url.Authority, Request.ApplicationPath.TrimEnd('/'));
        }

        protected void btnSend_Click(object sender, EventArgs e)
        {
            string url = string.Format("{0}api/SendPush?title={1}&body={2}&category={3}&token={4}", baseUrl, txtTitle.Text,txtBody.Text,txtCategory.Text,txtToken.Text);

            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            request.Method = "GET";
            request.ContentType = "application/json";
            request.Headers.Add("token", token);

            try
            {
                HttpWebResponse response = (HttpWebResponse)request.GetResponse();
                using (Stream responseStream = response.GetResponseStream())
                {
                    StreamReader reader = new StreamReader(responseStream, System.Text.Encoding.UTF8);
                    string resultJSON = reader.ReadToEnd();
                    var result = JsonConvert.DeserializeObject<APNsResult>(resultJSON);
                    txtResult.Text = resultJSON;
                    txtURL.Text = url;
                    btnSend.Focus();
                }
            }
            catch (Exception ex) 
            {
                txtResult.Text = ex.Message;
            }
        }

    }

    public class APNsResult
    {
        public bool IsSuccess { get; set; }
        public int Reason { get; set; }
        public string ReasonString { get; set; }
    }
}