src/Web/WebhookClient/Pages/RegisterWebhook.cshtml.cs

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using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;
using Microsoft.Extensions.Options;
using System.Net;
using System.Net.Http;
using System.Net.Http.Formatting;
using System.Threading.Tasks;
using WebhookClient.Models;
using System.Text.Json;

namespace WebhookClient.Pages
{
    [Authorize]

    public class RegisterWebhookModel : PageModel
    {
        private readonly Settings _settings;
        private readonly IHttpClientFactory _httpClientFactory;

        [BindProperty] public string Token { get; set; }

        public int ResponseCode { get; set; }
        public string RequestUrl { get; set; }
        public string GrantUrl { get; set; }
        public string ResponseMessage { get; set; }
        public string RequestBodyJson { get; set; }

        public RegisterWebhookModel(IOptions<Settings> settings, IHttpClientFactory httpClientFactory)
        {
            _settings = settings.Value;
            _httpClientFactory = httpClientFactory;
        }

        public void OnGet()
        {
            ResponseCode = (int)HttpStatusCode.OK;
            Token = _settings.Token;
        }

        public async Task<IActionResult> OnPost()
        {
            ResponseCode = (int)HttpStatusCode.OK;
            var protocol = Request.IsHttps ? "https" : "http";
            var selfurl = !string.IsNullOrEmpty(_settings.SelfUrl) ? _settings.SelfUrl : $"{protocol}://{Request.Host}/{Request.PathBase}";
            if (!selfurl.EndsWith("/"))
            {
                selfurl = selfurl + "/";
            }
            var granturl = $"{selfurl}check";
            var url = $"{selfurl}webhook-received";
            var client = _httpClientFactory.CreateClient("GrantClient");

            var payload = new WebhookSubscriptionRequest()
            {
                Event = "OrderPaid",
                GrantUrl = granturl,
                Url = url,
                Token = Token
            };