Navigator 1.9.0-beta4

Navigator

A highly opinionated telegram bot framework, mainly based on Telegram.Bot.

This framework relies heavily in MediatR and it is shaped accordingly.

The base package (Navigator) it's usable on it's own but the Actions extension it's highly encouraged as it brings default implementations for almost every type of incoming telegram update, in the future we may merge it into the base package.

For storage of users, chats and conversations the Store extension works really well with Navigator, it automatically recognizes users and groups, saves them to the database for future use and injects into the NavigatorContext all the data you may have about a user or a chat, you can also use your own models and it will still work, check out the examples for more information.

Finally the Shipyard WIP package gives you an useful API to retrieve information about your bot, change some of it's configuration and launch some actions. A companion web-based UI is also planned.

Packages

Package	Last Stable	Last Prerelease
Navigator
Navigator.Extensions.Actions
Navigator.Extensions.Store
Navigator.Extensions.Shipyard

Requirements

• ASP.NET (>= net5.0)
• MediatR (>= 9.0.0)

Examples

Some examples can be found in the samples repository.

Also checkout some bots made with Navigator:

• @ThankiesBot, check out it's source code.
• @FOSCBot, check out it's source code.

Basic Usage

Configuration

Including Navigator in your project is simple:

public class Startup
{
    // ...

    public void ConfigureServices(IServiceCollection services)
    {
        // ...
        services.AddControllers().AddNewtonsoftJson();

        services.AddMediatR(typeof(Startup).Assembly); // And any other assembly that may be needed.
        
        services.AddNavigator(options =>
        {
            options.SetTelegramToken(Configuration["BOT_TOKEN"]); // Your telegram bot token.
            options.SetWebHookBaseUrl(Configuration["BASE_WEBHOOK_URL"]); // The base url where you are going to receive the updates from teelgram.
            options.RegisterActionsFromAssemblies(typeof(Startup).Assembly); // All your actions.
        });

        /// ...
    }

    public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            /// ...

            app.UseEndpoints(endpoints =>
            {
                endpoints.MapControllers();
                endpoints.MapNavigator(); // In order to receive updates from telegram.
            });

            /// ...
        }
}

More options are available, check out the wiki.

Bot Actions

Example of a basic echo action using the base package + the actions extension.

public class EchoAction : MessageAction
{
    public string MessageToEcho { get; set; } = string.Empty;
    
    public override IAction Init(INavigatorContext ctx)
    {
        if (string.IsNullOrWhiteSpace(ctx.Update.Message.Text))
        {
            MessageToEcho = ctx.Update.Message.Text;
        }
        return this;
    }

    public override bool CanHandle(INavigatorContext ctx)
    {
        return !string.IsNullOrWhiteSpace(MessageToEcho);
    }
}

/// ...

public class EchoActionHandler : ActionHandler<EchoAction>
{
    public EchoActionHandler(INavigatorContext ctx) : base(ctx)
    {
    }

    public override async Task<Unit> Handle(EchoAction request, CancellationToken cancellationToken)
    {
        await Ctx.Client.SendTextMessageAsync(Ctx.GetTelegramChat(), request.MessageToEcho,
            cancellationToken: cancellationToken);

        return Unit.Value;
    }
}

License

Navigator Framework Copyright (C) 2019-2021 Lucas Maximiliano Marino

This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details.

You should have received a copy of the GNU Affero General Public License along with this program. If not, see https://www.gnu.org/licenses/.