Writing GitHub bots in .NET

add-package-1.sh

dotnet add package Octokit.Webhooks.AspNetCore

add-package-2.sh

dotnet add package Octokit

MyWebhookEventProcessor.1.cs

using Octokit.Webhooks;
using Octokit.Webhooks.Events;
using Octokit.Webhooks.Events.IssueComment;

public sealed class MyWebhookEventProcessor : WebhookEventProcessor
{

  private readonly ILogger<MyWebhookEventProcessor> logger;

  public MyWebhookEventProcessor(ILogger<MyWebhookEventProcessor> logger)
  {
    this.logger = logger;
  }

  protected override Task ProcessIssueCommentWebhookAsync(WebhookHeaders headers, IssueCommentEvent issueCommentEvent, IssueCommentAction action)
  {
    this.logger.LogInformation(issueCommentEvent.Comment.Body);
    return Task.CompletedTask;
  }
}

MyWebhookEventProcessor.2.cs

private readonly GitHubClient client;

public MyWebhookEventProcessor(ILogger<MyWebhookEventProcessor> logger)
{
  this.logger = logger;
  this.client = new GitHubClient(new ProductHeaderValue("octokit-webhooks-sample"))
  {
    Credentials = new Credentials("...")
  };
}

MyWebhookEventProcessor.3.cs

protected override async Task ProcessIssueCommentWebhookAsync(WebhookHeaders headers, IssueCommentEvent issueCommentEvent, IssueCommentAction action)
{
  this.logger.LogInformation(issueCommentEvent.Comment.Body);
  await this.client.Issue.Comment.Create(
    repositoryId: issueCommentEvent.Repository.Id,
    number: (int)issueCommentEvent.Issue.Number,
    newComment: "Hello, world!"
  );
}

new-project.sh

dotnet new webapi --output octokit-webhooks-sample

output.1.txt

info: Microsoft.Hosting.Lifetime[14]
      Now listening on: http://localhost:5002

output.2.txt

$ ssh -R 80:localhost:5002 nokey@localhost.run

...

b49b69845954b1.lhrtunnel.link tunneled with tls termination, https://b49b69845954b1.lhrtunnel.link

output.3.txt

info: MyWebhookEventProcessor[0]
      Test comment

Program.1.cs

var builder = WebApplication.CreateBuilder(args);

var app = builder.Build();

app.Run();

Program.2.cs

using Octokit.Webhooks;
using Octokit.Webhooks.AspNetCore;

var builder = WebApplication.CreateBuilder(args);

builder.Services.AddSingleton<WebhookEventProcessor, MyWebhookEventProcessor>();

var app = builder.Build();

app.UseRouting();

app.UseEndpoints(endpoints =>
{
  endpoints.MapGitHubWebhooks();
});

app.Run();