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Telegram MTProto API client in Go for users and bots.

Telegram: English chat Telegram: Russian chat Telegram: Chinese chat Telegram: Online count

Before using this library, read How To Not Get Banned guide.

Due to limitations of pkg.go.dev, documentation for tg package is not shown, but there is hosted version.

Higher level libraries

The gotd itself is a pretty low-level library, and you may want to use higher level libraries instead:

Usage

go get github.com/gotd/td

package main

import (
	"context"

	"github.com/gotd/td/telegram"
)

func main() {
	// https://core.telegram.org/api/obtaining_api_id
	client := telegram.NewClient(appID, appHash, telegram.Options{})
	if err := client.Run(context.Background(), func(ctx context.Context) error {
		// It is only valid to use client while this function is not returned
		// and ctx is not cancelled.
		api := client.API()

		// Now you can invoke MTProto RPC requests by calling the API.
		// ...

		// Return to close client connection and free up resources.
		return nil
	}); err != nil {
		panic(err)
	}
	// Client is closed.
}

See examples for more info.

Features

Status

The goal of this project is to implement a stable, performant and safe client for Telegram in pure Go while having a simple and convenient API and a feature parity with TDLib.

This project is fully non-commercial and not affiliated with any commercial organization (including Telegram LLC).

Examples

See examples directory.

Also take a look at

Auth

User

You can use td/telegram/auth.Flow to simplify user authentications.

codePrompt := func(ctx context.Context, sentCode *tg.AuthSentCode) (string, error) {
    // NB: Use "golang.org/x/crypto/ssh/terminal" to prompt password.
    fmt.Print("Enter code: ")
    code, err := bufio.NewReader(os.Stdin).ReadString('\n')
    if err != nil {
        return "", err
    }
    return strings.TrimSpace(code), nil
}
// This will setup and perform authentication flow.
// If account does not require 2FA password, use telegram.CodeOnlyAuth
// instead of telegram.ConstantAuth.
if err := auth.NewFlow(
    auth.Constant(phone, password, auth.CodeAuthenticatorFunc(codePrompt)),
    auth.SendCodeOptions{},
).Run(ctx, client.Auth()); err != nil {
    panic(err)
}

Bot

Use bot token from @BotFather.

if err := client.Auth().Bot(ctx, "token:12345"); err != nil {
    panic(err)
}

Calling MTProto directly

You can use the generated tg.Client that allows calling any MTProto method directly.

// Grab these from https://my.telegram.org/apps.
// Never share it or hardcode!
client := telegram.NewClient(appID, appHash, telegram.Options{})
client.Run(ctx, func(ctx context.Context) error {
  // Grab token from @BotFather.
  if _, err := client.Auth().Bot(ctx, "token:12345"); err != nil {
    return err
  }
  state, err := client.API().UpdatesGetState(ctx)
  if err != nil {
    return err
  }
  // Got state: &{Pts:197 Qts:0 Date:1606855030 Seq:1 UnreadCount:106}
  // This will close client and cleanup resources.
  return nil
})

Generated code

The code output of gotdgen contains references to TL types, examples, URL to official documentation and extracted comments from it.

For example, the auth.Authorization type in tg/tl_auth_authorization_gen.go:

// AuthAuthorizationClass represents auth.Authorization generic type.
//
// See https://core.telegram.org/type/auth.Authorization for reference.
//
// Example:
//  g, err := DecodeAuthAuthorization(buf)
//  if err != nil {
//      panic(err)
//  }
//  switch v := g.(type) {
//  case *AuthAuthorization: // auth.authorization#cd050916
//  case *AuthAuthorizationSignUpRequired: // auth.authorizationSignUpRequired#44747e9a
//  default: panic(v)
//  }
type AuthAuthorizationClass interface {
	bin.Encoder
	bin.Decoder
	construct() AuthAuthorizationClass
}

Also, the corresponding auth.signIn method:

// AuthSignIn invokes method auth.signIn#bcd51581 returning error if any.
// Signs in a user with a validated phone number.
//
// See https://core.telegram.org/method/auth.signIn for reference.
func (c *Client) AuthSignIn(ctx context.Context, request *AuthSignInRequest) (AuthAuthorizationClass, error) {}

The generated constructors contain detailed official documentation, including links:

// FoldersDeleteFolderRequest represents TL type `folders.deleteFolder#1c295881`.
// Delete a peer folder¹
//
// Links:
//  1) https://core.telegram.org/api/folders#peer-folders
//
// See https://core.telegram.org/method/folders.deleteFolder for reference.
type FoldersDeleteFolderRequest struct {
    // Peer folder ID, for more info click here¹
    //
    // Links:
    //  1) https://core.telegram.org/api/folders#peer-folders
    FolderID int
}

Contributions

Huge thanks to all contributors. Dealing with a project of this scale alone is impossible.

Special thanks:

Reference

The MTProto protocol description is hosted by Telegram.

Most important parts for client implementations:

Current implementation mostly conforms to security guidelines, but no formal security audit were performed.

Prior art

Who is using gotd?

<img src="https://user-images.githubusercontent.com/43930873/142855897-7091ced0-4fe8-4f8d-ad43-e9db2723bacc.png" width="150">

Drop a comment here to add your project.

License

MIT License

Created by Aleksandr (ernado) Razumov

2020

Links