Echo Bot

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Overview

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Code

package main

import (
	"github.com/amarnathcjd/gogram/telegram"
)

func main() {
	// Create and authenticate the client
	client, _ := telegram.NewClient(telegram.ClientConfig{
		AppID:   6,
		AppHash: "YOUR_APP_HASH",
	})
	client.LoginBot("YOUR_BOT_TOKEN")

	// Handle all private messages - echo them back
	client.On(telegram.OnMessage, func(message *telegram.NewMessage) error {
		// Respond with the same message (echo)
		message.Respond(message)
		return nil
	}, telegram.FilterPrivate) // Only respond to private messages

	// Handle /start command specifically
	client.On("cmd:start", func(message *telegram.NewMessage) error {
		// Reply with a greeting
		message.Reply("Hello, I am a bot!")
		return nil
	})
	
	// Keep the bot running
	client.Idle()
}

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How It Works

1. Create & Authenticate - Set up the client and login as a bot
2. Private Message Handler - Listen for all messages in private chats using telegram.OnMessage event
3. Echo Response - Use message.Respond(message) to send back the same message
4. Filter Private - telegram.FilterPrivate ensures the bot only echoes in private chats, not groups
5. Start Command - Special handler for /start command that sends a greeting
6. Keep Running - client.Idle() keeps the bot alive and listening for updates

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Key Differences

• message.Reply() - Replies to the original message (shows “in reply to”)
• message.Respond() - Sends a new message without replying
• Event Pattern - cmd:start" is a shorthand for handling the /start command

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Running the Example

1. Replace YOUR_APP_HASH with your API hash
2. Replace YOUR_BOT_TOKEN with your bot token from @BotFather
3. Run the program:
   go run main.go
   
4. Send any message to your bot in private chat - it will echo it back!
5. Try /start to see the greeting message

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Next Steps