AppWeb.TelegramBotClient

This is a .Net Standard client for communication with the Telegram Bot API. The client is available through a nuget.

Project url: https://appweb.se/en/packages/telegram-bot-client

You will find Telegram bot api documentation at:

• https://core.telegram.org/bots
• https://core.telegram.org/bots/api

Installation

Nuget package https://www.nuget.org/packages/AppWeb.TelegramBotClient/

install-package AppWeb.TelegramBotClient

Supported telegram bot api endpoints:

• '/sendMessage' to send message to a chat by given chat_id
• '/getUpdates' get updates (messages) sent to the bot
• '/setWebhook' updates what webhook settings should be used.
• '/deleteWebhook' deletes your webhook configuration and you have to use /getUpdates instead

Important Note!

If '/setWebhook' is used you cannot receive updates through polling '/getUpdates' due to limitations in telegram bot api. You will also have to use a HTTPS connection for your webhook. Read more at: https://core.telegram.org/bots/api#setwebhook

Todo

• Implement more telegram bot api endpoints
• Nuget package
• Add tests

Coommand line tool for controling and test your bot

The provided project TelegramBotApiCMD provides you with tooling using the TelegramBotApiClient, using this you can test and configure your bot.

Available commands:

• exit to exit application
• getupdates to receive messages
• help for help
• deletewebhook to delete webhook configuration
• setwebhook <webhookUrl> to configure webhook
• settoken <token> to set token for current session

Example projects in solution

• One example of a .net core console application polling updates from bot api through '/getUpdates', it can also be used as a tool to configure your bot and read/send messages
• One example of a .net core web application setting webhook that receives updates and reply to the sender.

Example code for setting up webhook, see example project in solution

// This method gets called by the runtime. Use this method to add services to the container.
public void ConfigureServices(IServiceCollection services)
{
    // Add framework services.
    services.AddMvc();

    // Setup telegram client
    TelegramClient telegramClient = new TelegramClient();

    var authenticationToken = Configuration["Settings:authenticationToken"];
    telegramClient.SetAuthenticationToken(authenticationToken);
            
    // Set up webhook
    string webhookUrl = Configuration["Settings:webhookUrl"];
    int maxConnections = int.Parse(Configuration["Settings:maxConnections"]);
    UpdateType[] allowedUpdates = { UpdateType.MessageUpdate };

    telegramClient.SetWebhook(webhookUrl, maxConnections, allowedUpdates);

    services.AddScoped<ITelegramClient>(client => telegramClient);
}

Example code receiving webhook update and sending a replying message, see example project in solution

[Route("api/[controller]")]
public class TelegramController : Controller
{
    ITelegramClient _telegramClient;
    public TelegramController(ITelegramClient telegramClient) {
        _telegramClient = telegramClient;
    }

    // GET api/telegram/update/{token}
    [HttpPost("update/{token}")]
    public void Update([FromRoute]string token, [FromBody]Update update)
    {
        if (token != _telegramClient.GetAuthenticationToken())
            return;

        if(update != null && update.Message != null)
            _telegramClient.SendMessage(update.Message.Chat.Id, $"I received your message: \"{update.Message.Text}\"");
            
        return;
    }
}