telegram

Documentation

Overview

Package telegram implements Telegram client.

Index

• Constants
• Variables
• func BotFromEnvironment(ctx context.Context, opts Options, ...) error
• func RunUntilCanceled(ctx context.Context, client *Client) error
• func TestClient(ctx context.Context, opts Options, ...) error
• type Client
  • func ClientFromEnvironment(opts Options) (*Client, error)
  • func NewClient(appID int, appHash string, opt Options) *Client
  • func (c *Client) API() *tg.Client
  • func (c *Client) Auth() *auth.Client
  • func (c *Client) Config() tg.Config
  • func (c *Client) DC(ctx context.Context, dc int, max int64) (CloseInvoker, error)
  • func (c *Client) Invoke(ctx context.Context, input bin.Encoder, output bin.Decoder) error
  • func (c *Client) MediaOnly(ctx context.Context, dc int, max int64) (CloseInvoker, error)
  • func (c *Client) Ping(ctx context.Context) error
  • func (c *Client) Pool(max int64) (CloseInvoker, error)
  • func (c *Client) RandInt64() (int64, error)
  • func (c *Client) Run(ctx context.Context, f func(ctx context.Context) error) (err error)
  • func (c *Client) Self(ctx context.Context) (*tg.User, error)
  • func (c *Client) SendMessage(ctx context.Context, req *tg.MessagesSendMessageRequest) error
• type CloseInvoker
• type DeviceConfig
• type Error
• type FileSessionStorage
• type InvokeFunc
  • func (i InvokeFunc) Invoke(ctx context.Context, input bin.Encoder, output bin.Decoder) error
• type Middleware
• type MiddlewareFunc
  • func (m MiddlewareFunc) Handle(next tg.Invoker) InvokeFunc
• type Options
  • func OptionsFromEnvironment(opts Options) (Options, error)
• type PublicKey
• type SessionStorage
• type UpdateHandler
• type UpdateHandlerFunc
  • func (f UpdateHandlerFunc) Handle(ctx context.Context, u tg.UpdatesClass) error

Examples

• Client (Mtproxy)
• Client.Auth
• Client.Auth (Test)
• Middleware

Constants

const (
	AddrProduction = "149.154.167.50:443"
	AddrTest       = "149.154.167.40:443"
)

Available MTProto default server addresses.

See https://my.telegram.org/apps.

const (
	TestAppID   = constant.TestAppID
	TestAppHash = constant.TestAppHash
)

Test-only credentials. Can be used with AddrTest and TestAuth to test authentication.

Reference:

• https://github.com/telegramdesktop/tdesktop/blob/5f665b8ecb48802cd13cfb48ec834b946459274a/docs/api_credentials.md

const ErrFloodWait = tgerr.ErrFloodWait

ErrFloodWait is error type of "FLOOD_WAIT" error.

const Port = 443

Port is default port used by telegram.

Variables

var AsFloodWait = tgerr.AsFloodWait

AsFloodWait returns wait duration and true boolean if err is the "FLOOD_WAIT" error.

Client should wait for that duration before issuing new requests with same method.

Functions

func BotFromEnvironment

func BotFromEnvironment(
	ctx context.Context,
	opts Options,
	setup func(ctx context.Context, client *Client) error,
	cb func(ctx context.Context, client *Client) error,
) error

BotFromEnvironment creates bot client using ClientFromEnvironment connects to server and authenticates it.

Variables: BOT_TOKEN — token from BotFather.

func RunUntilCanceled

func RunUntilCanceled(ctx context.Context, client *Client) error

RunUntilCanceled is client callback which locks until client context is canceled.

func TestClient

func TestClient(ctx context.Context, opts Options, cb func(ctx context.Context, client *Client) error) error

TestClient creates and authenticates user telegram.Client using Telegram staging server.

Types

type Client

type Client struct {
	// contains filtered or unexported fields
}

Client represents a MTProto client to Telegram.

Example (Mtproxy)

package main

import (
	"context"
	"encoding/hex"
	"fmt"
	"os"
	"os/signal"

	"golang.org/x/xerrors"

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

func connectViaMTProxy(ctx context.Context) error {
	secret, err := hex.DecodeString(os.Getenv("SECRET"))
	if err != nil {
		return xerrors.Errorf("parse secret: %w", err)
	}

	resolver, err := dcs.MTProxy(
		os.Getenv("PROXY_ADDR"),
		secret,
		dcs.MTProxyOptions{},
	)
	if err != nil {
		return xerrors.Errorf("create MTProxy resolver: %w", err)
	}

	client, err := telegram.ClientFromEnvironment(telegram.Options{
		Resolver: resolver,
	})
	if err != nil {
		return xerrors.Errorf("create client: %w", err)
	}

	return client.Run(ctx, func(ctx context.Context) error {
		cfg, err := tg.NewClient(client).HelpGetConfig(ctx)
		if err != nil {
			return xerrors.Errorf("get config: %w", err)
		}

		fmt.Println("This DC: ", cfg.ThisDC)
		return nil
	})
}

func main() {
	ctx, cancel := signal.NotifyContext(context.Background(), os.Interrupt)
	defer cancel()

	if err := connectViaMTProxy(ctx); err != nil {
		_, _ = fmt.Fprintf(os.Stderr, "%+v\n", err)
		os.Exit(1)
	}
}

func ClientFromEnvironment

func ClientFromEnvironment(opts Options) (*Client, error)

ClientFromEnvironment creates client using OptionsFromEnvironment but does not connect to server.

Variables:

APP_ID:   app_id of Telegram app.
APP_HASH: app_hash of Telegram app.

func NewClient

func NewClient(appID int, appHash string, opt Options) *Client

NewClient creates new unstarted client.

func (*Client) API

func (c *Client) API() *tg.Client

API returns *tg.Client for calling raw MTProto methods.

func (*Client) Auth

func (c *Client) Auth() *auth.Client

Auth returns auth client.

Example

package main

import (
	"bufio"
	"context"
	"fmt"
	"log"
	"os"
	"strconv"
	"strings"

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

func main() {
	check := func(err error) {
		if err != nil {
			panic(err)
		}
	}

	var (
		appIDString = os.Getenv("APP_ID")
		appHash     = os.Getenv("APP_HASH")
		phone       = os.Getenv("PHONE")
		pass        = os.Getenv("PASSWORD")
	)
	if appIDString == "" || appHash == "" || phone == "" || pass == "" {
		log.Fatal("PHONE, PASSWORD, APP_ID or APP_HASH is not set")
	}

	appID, err := strconv.Atoi(appIDString)
	check(err)

	ctx := context.Background()
	client := telegram.NewClient(appID, appHash, telegram.Options{})
	codeAsk := func(ctx context.Context, sentCode *tg.AuthSentCode) (string, error) {
		fmt.Print("code:")
		code, err := bufio.NewReader(os.Stdin).ReadString('\n')
		if err != nil {
			return "", err
		}
		code = strings.ReplaceAll(code, "\n", "")
		return code, nil
	}

	check(client.Run(ctx, func(ctx context.Context) error {
		return auth.NewFlow(
			auth.Constant(phone, pass, auth.CodeAuthenticatorFunc(codeAsk)),
			auth.SendCodeOptions{},
		).Run(ctx, client.Auth())
	}))
}

Example (Test)

package main

import (
	"context"
	"crypto/rand"

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

func main() {
	// Example of using test server.
	const dcID = 2

	ctx := context.Background()
	client := telegram.NewClient(telegram.TestAppID, telegram.TestAppHash, telegram.Options{
		DC:     dcID,
		DCList: dcs.Staging(),
	})
	if err := client.Run(ctx, func(ctx context.Context) error {
		return auth.NewFlow(
			auth.Test(rand.Reader, dcID),
			auth.SendCodeOptions{},
		).Run(ctx, client.Auth())
	}); err != nil {
		panic(err)
	}
}

func (*Client) Config

func (c *Client) Config() tg.Config

Config returns current config.

func (*Client) DC

func (c *Client) DC(ctx context.Context, dc int, max int64) (CloseInvoker, error)

DC creates new multi-connection invoker to given DC.

func (*Client) Invoke

func (c *Client) Invoke(ctx context.Context, input bin.Encoder, output bin.Decoder) error

Invoke invokes raw MTProto RPC method. It sends input and decodes result into output.

func (*Client) MediaOnly

func (c *Client) MediaOnly(ctx context.Context, dc int, max int64) (CloseInvoker, error)

MediaOnly creates new multi-connection invoker to given DC ID. It connects to MediaOnly DCs.

func (*Client) Ping

func (c *Client) Ping(ctx context.Context) error

Ping sends low level ping request to Telegram server.

func (*Client) Pool

func (c *Client) Pool(max int64) (CloseInvoker, error)

Pool creates new multi-connection invoker to current DC.

func (*Client) RandInt64

func (c *Client) RandInt64() (int64, error)

RandInt64 returns new random int64 from random source.

Useful helper for places in API where random int is required.

func (*Client) Run

func (c *Client) Run(ctx context.Context, f func(ctx context.Context) error) (err error)

Run starts client session and blocks until connection close. The f callback is called on successful session initialization and Run will return on f() result.

Context of callback will be canceled if fatal error is detected. The ctx is used for background operations like updates handling or pools.

See `examples/bg-run` and `contrib/gb` package for classic approach without explicit callback, with Connect and defer close().

func (*Client) Self

func (c *Client) Self(ctx context.Context) (*tg.User, error)

Self returns current user.

You can use tg.User.Bot to check whether current user is bot.

func (*Client) SendMessage

func (c *Client) SendMessage(ctx context.Context, req *tg.MessagesSendMessageRequest) error

SendMessage sends message to peer.

Deprecated: use helpers like message.NewSender.

type CloseInvoker

type CloseInvoker interface {
	tg.Invoker
	Close() error
}

CloseInvoker is a closeable tg.Invoker.

type DeviceConfig

type DeviceConfig = manager.DeviceConfig

DeviceConfig is config which send when Telegram connection session created.

type Error

type Error = tgerr.Error

Error represents RPC error returned to request.

type FileSessionStorage

type FileSessionStorage = session.FileStorage

FileSessionStorage is alias of mtproto.FileSessionStorage.

type InvokeFunc

type InvokeFunc func(ctx context.Context, input bin.Encoder, output bin.Decoder) error

InvokeFunc implements tg.Invoker as function.

func (InvokeFunc) Invoke

func (i InvokeFunc) Invoke(ctx context.Context, input bin.Encoder, output bin.Decoder) error

Invoke implements tg.Invoker.

type Middleware

type Middleware interface {
	Handle(next tg.Invoker) InvokeFunc
}

Middleware returns new InvokeFunc for next invoker.

Example

invoker := InvokeFunc(func(ctx context.Context, input bin.Encoder, output bin.Decoder) error {
	fmt.Println("invoke")
	return nil
})
printMiddleware := func(message string) Middleware {
	return MiddlewareFunc(func(next tg.Invoker) InvokeFunc {
		return func(ctx context.Context, input bin.Encoder, output bin.Decoder) error {
			fmt.Println(message, "(start)")
			err := next.Invoke(ctx, input, output)
			fmt.Println(message, "(end)")
			return err
		}
	})
}

// Testing composed invoker.
_ = chainMiddlewares(invoker,
	printMiddleware("first"),
	printMiddleware("second"),
).Invoke(context.Background(), nil, nil)

Output:

first (start)
second (start)
invoke
second (end)
first (end)

type MiddlewareFunc

type MiddlewareFunc func(next tg.Invoker) InvokeFunc

MiddlewareFunc implements Middleware as function.

func (MiddlewareFunc) Handle

func (m MiddlewareFunc) Handle(next tg.Invoker) InvokeFunc

Handle implements Middleware.

type Options

type Options struct {
	// PublicKeys of telegram.
	//
	// If not provided, embedded public keys will be used.
	PublicKeys []PublicKey

	// DC ID to connect.
	//
	// If not provided, 2 will be used by default.
	DC int

	// DCList is initial list of addresses to connect.
	DCList dcs.List

	// Resolver to use.
	Resolver dcs.Resolver
	// NoUpdates enables no updates mode.
	//
	// Enabled by default if no UpdateHandler is provided.
	NoUpdates bool
	// ReconnectionBackoff configures and returns reconnection backoff object.
	ReconnectionBackoff func() backoff.BackOff
	// MigrationTimeout configures migration timeout.
	MigrationTimeout time.Duration
	// Random is random source. Defaults to crypto.
	Random io.Reader
	// Logger is instance of zap.Logger. No logs by default.
	Logger *zap.Logger
	// SessionStorage will be used to load and save session data.
	// NB: Very sensitive data, save with care.
	SessionStorage SessionStorage
	// UpdateHandler will be called on received update.
	UpdateHandler UpdateHandler
	// Middlewares list allows to wrap tg.Invoker. Can be useful for metrics,
	// tracing, etc. Note that order is important, see ExampleMiddleware.
	//
	// Middlewares are called in order from first to last.
	Middlewares []Middleware

	// AckBatchSize is maximum ack-s to buffer.
	AckBatchSize int
	// AckInterval is maximum time to buffer ack.
	AckInterval   time.Duration
	RetryInterval time.Duration
	MaxRetries    int

	// Device is device config.
	// Will be sent with session creation request.
	Device DeviceConfig

	MessageID mtproto.MessageIDSource
	Clock     clock.Clock
}

Options of Client.

func OptionsFromEnvironment

func OptionsFromEnvironment(opts Options) (Options, error)

OptionsFromEnvironment fills unfilled field in opts parameter using environment variables.

Variables:

SESSION_FILE:        path to session file
SESSION_DIR:         path to session directory, if SESSION_FILE is not set
ALL_PROXY, NO_PROXY: see https://pkg.go.dev/golang.org/x/net/proxy#FromEnvironment

type PublicKey

type PublicKey = exchange.PublicKey

PublicKey is a Telegram server public key.

type SessionStorage

type SessionStorage = session.Storage

SessionStorage is alias of mtproto.SessionStorage.

type UpdateHandler

type UpdateHandler interface {
	Handle(ctx context.Context, u tg.UpdatesClass) error
}

UpdateHandler will be called on received updates from Telegram.

type UpdateHandlerFunc

type UpdateHandlerFunc func(ctx context.Context, u tg.UpdatesClass) error

UpdateHandlerFunc type is an adapter to allow the use of ordinary function as update handler.

UpdateHandlerFunc(f) is an UpdateHandler that calls f.

func (UpdateHandlerFunc) Handle

func (f UpdateHandlerFunc) Handle(ctx context.Context, u tg.UpdatesClass) error

Handle calls f(ctx, u)