Bot Login

Bot login is simpler than user login — just a single call with a bot token.

Getting a bot token

1. Open Telegram and start a chat with @BotFather
2. Send /newbot
3. Follow the prompts to choose a name and username
4. BotFather gives you a token like: 1234567890:ABCdefGHIjklMNOpqrSTUvwxYZ

Login

#![allow(unused)]
fn main() {
client.bot_sign_in("1234567890:ABCdef...").await?;
client.save_session().await?;
}

That’s it. On the next run, is_authorized() returns true and you skip the login entirely:

#![allow(unused)]
fn main() {
if !client.is_authorized().await? {
    client.bot_sign_in(BOT_TOKEN).await?;
    client.save_session().await?;
}
}

Get bot info

After login you can fetch the bot’s own User object:

#![allow(unused)]
fn main() {
let me = client.get_me().await?;
println!("Bot: @{}", me.username.as_deref().unwrap_or("?"));
println!("ID: {}", me.id);
println!("Is bot: {}", me.bot);
}

Environment variables (recommended)

Don’t hardcode credentials in source code. Use environment variables instead:

#![allow(unused)]
fn main() {
let api_id: i32   = std::env::var("API_ID")?.parse()?;
let api_hash      = std::env::var("API_HASH")?;
let bot_token     = std::env::var("BOT_TOKEN")?;
}

Then run:

API_ID=12345 API_HASH=abc123 BOT_TOKEN=xxx:yyy cargo run

Or put them in a .env file and use the dotenvy crate.