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using System;
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using System.Net.Http;
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using System.Security.Cryptography;
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using System.Text;
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using System.Threading;
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using System.Threading.Tasks;
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using ASC.Common;
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using ASC.Common.Logging;
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using ASC.Web.Webhooks;
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using Microsoft.Extensions.DependencyInjection;
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using Microsoft.Extensions.Options;
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namespace ASC.Webhooks
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{
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[Singletone]
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public class WebhookSender
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{
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public int RepeatCount { get; } = 5;
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private static readonly HttpClient httpClient = new HttpClient();
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private IServiceProvider ServiceProvider { get; }
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private ILog Log { get; }
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public WebhookSender(IOptionsMonitor<ILog> options, IServiceProvider serviceProvider)
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{
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Log = options.Get("ASC.Webhooks");
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ServiceProvider = serviceProvider;
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}
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public async Task Send(WebhookRequest webhookRequest, CancellationToken cancellationToken)
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{
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using var scope = ServiceProvider.CreateScope();
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var dbWorker = scope.ServiceProvider.GetService<DbWorker>();
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var entry = dbWorker.ReadFromJournal(webhookRequest.Id);
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var id = entry.Id;
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var requestURI = entry.Uri;
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var secretKey = entry.SecretKey;
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var data = entry.Data;
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for (int i = 0; i < RepeatCount; i++)
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{
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try
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{
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var request = new HttpRequestMessage(HttpMethod.Post, requestURI);
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request.Headers.Add("Accept", "*/*");
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request.Headers.Add("Secret","SHA256=" + GetSecretHash(secretKey, data));
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request.Content = new StringContent(
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data,
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Encoding.UTF8,
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"application/json");
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var response = await httpClient.SendAsync(request, cancellationToken);
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if (response.IsSuccessStatusCode)
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{
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dbWorker.UpdateStatus(id, ProcessStatus.Success);
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Log.Debug("Response: " + response);
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break;
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}
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}
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catch (Exception ex)
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{
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if(i == RepeatCount)
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{
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dbWorker.UpdateStatus(id, ProcessStatus.Failed);
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}
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Log.Error(ex.Message);
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continue;
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}
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}
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}
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private string GetSecretHash(string secretKey, string body)
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{
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string computedSignature;
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var secretBytes = Encoding.UTF8.GetBytes(secretKey);
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using (var hasher = new HMACSHA256(secretBytes))
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{
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var data = Encoding.UTF8.GetBytes(body);
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computedSignature = BitConverter.ToString(hasher.ComputeHash(data));
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}
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return computedSignature;
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}
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}
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}
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