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//! Simple SMTP-to-Telegram gateway. Can parse email and send them as telegram
//! messages to specified chats, generally you specify which email address is
//! available in configuration, everything else is sent to default address.
use smol_macros::{
LocalExecutor,
main,
};
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//! Simple SMTP-to-Telegram gateway. Can parse email and send them as telegram
//! messages to specified chats, generally you specify which email address is
//! available in configuration, everything else is sent to default address.
use std::{
os::unix::fs::PermissionsExt,
path::Path,
};
use clap::Parser;
use smol::fs::metadata;
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#[command(about = format!("SMTP-to-Telegram gateway v{}, (C) 2024 - 2026", env!("CARGO_PKG_VERSION")), long_about = None)]
struct Args {
/// Set configuration file location
#[arg(short, long, default_value = "smtp2tg.toml")]
config: String,
}
main! {
async fn main (ex: &LocalExecutor<'_>) -> Result<()> {
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#[command(about = format!("SMTP-to-Telegram gateway v{}, (C) 2024 - 2026", env!("CARGO_PKG_VERSION")), long_about = None)]
struct Args {
/// Set configuration file location
#[arg(short, long, default_value = "smtp2tg.toml")]
config: String,
}
/// Main asynchronous entry point for the application. Runs the gateway using
/// the configuration selected on the command line.
///
/// The configuration file must use owner-only permissions. Once configured,
/// the SMTP server runs until it stops or encounters an error.
///
/// # Errors
/// Returns an error if the configuration file is missing, inaccessible,
/// insecure, malformed, or contains invalid required settings.
/// Also returns an error if the system hostname cannot be read or is not
/// valid UTF-8, or if mail server initialisation fails.
///
/// # Panics
/// Panics if configuring or serving the SMTP server fails.
fn main () -> Result<()> {
smol::block_on(async move{
let args = Args::parse();
let settings = {
// Load configuration defaults and overrides after checking file permissions.
let config_file = Path::new(&args.config);
if !config_file.try_exists().stack()? {
bail!("Configuration file not found: {config_file:?}\n\
Hint: Ensure the file exists and the path is correct.");
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let server_name = settings.get_string("hostname").stack()?;
let core = MailServer::new(settings)?;
let mut server = mailin_embedded::Server::new(core);
// TODO: remove unwraps when mailin-embedded bumps with better error handling
server.with_name(server_name)
.with_ssl(mailin_embedded::SslConfig::None).unwrap()
.with_addr(listen_on).unwrap();
server.serve().unwrap();
Ok(())
} }
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let server_name = settings.get_string("hostname").stack()?;
let core = MailServer::new(settings)?;
let mut server = mailin_embedded::Server::new(core);
// TODO: remove unwraps when mailin-embedded bumps with better error handling
server.with_name(server_name)
.with_ssl(mailin_embedded::SslConfig::None).unwrap()
.with_addr(listen_on).unwrap()
.with_num_threads(1);
server.serve().unwrap();
Ok(())
})
}
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