Lines of
src/main.rs
from check-in c996f5c871
that are changed by the sequence of edits moving toward
check-in 3c858ed7c4:
1: //! Simple SMTP-to-Telegram gateway. Can parse email and send them as telegram
2: //! messages to specified chats, generally you specify which email address is
3: //! available in configuration, everything else is sent to default address.
4:
c996f5c871 2026-01-12 5: mod mail;
c996f5c871 2026-01-12 6: mod telegram;
c996f5c871 2026-01-12 7: mod utils;
c996f5c871 2026-01-12 8:
c996f5c871 2026-01-12 9: #[cfg(test)]
c996f5c871 2026-01-12 10: mod tests;
c996f5c871 2026-01-12 11:
c996f5c871 2026-01-12 12: use crate::mail::MailServer;
c996f5c871 2026-01-12 13:
14: use async_compat::Compat;
c996f5c871 2026-01-12 15: use just_getopt::{
c996f5c871 2026-01-12 16: OptFlags,
c996f5c871 2026-01-12 17: OptSpecs,
c996f5c871 2026-01-12 18: OptValue,
c996f5c871 2026-01-12 19: };
c996f5c871 2026-01-12 20: use smol::{
c996f5c871 2026-01-12 21: fs::metadata,
c996f5c871 2026-01-12 22: };
c996f5c871 2026-01-12 23: use stacked_errors::{
c996f5c871 2026-01-12 24: Result,
c996f5c871 2026-01-12 25: StackableErr,
c996f5c871 2026-01-12 26: bail,
c996f5c871 2026-01-12 27: };
28:
c996f5c871 2026-01-12 29: use std::{
c996f5c871 2026-01-12 30: io::Cursor,
c996f5c871 2026-01-12 31: os::unix::fs::PermissionsExt,
c996f5c871 2026-01-12 32: path::Path,
c996f5c871 2026-01-12 33: };
c996f5c871 2026-01-12 34:
35: fn main () -> Result<()> {
36: smol::block_on(Compat::new(async {
c996f5c871 2026-01-12 37: async_main().await.unwrap()
38: }));
c996f5c871 2026-01-12 39:
c996f5c871 2026-01-12 40: Ok(())
c996f5c871 2026-01-12 41: }
c996f5c871 2026-01-12 42:
c996f5c871 2026-01-12 43: /// Actual main function running async with Error propagation support
c996f5c871 2026-01-12 44: async fn async_main () -> Result<()> {
c996f5c871 2026-01-12 45: let specs = OptSpecs::new()
c996f5c871 2026-01-12 46: .option("help", "h", OptValue::None)
c996f5c871 2026-01-12 47: .option("help", "help", OptValue::None)
c996f5c871 2026-01-12 48: .option("config", "c", OptValue::Required)
c996f5c871 2026-01-12 49: .option("config", "config", OptValue::Required)
c996f5c871 2026-01-12 50: .flag(OptFlags::OptionsEverywhere);
c996f5c871 2026-01-12 51: let mut args = std::env::args();
c996f5c871 2026-01-12 52: args.next();
c996f5c871 2026-01-12 53: let parsed = specs.getopt(args);
c996f5c871 2026-01-12 54: for u in &parsed.unknown {
c996f5c871 2026-01-12 55: println!("Unknown option: {u}");
c996f5c871 2026-01-12 56: }
c996f5c871 2026-01-12 57: if !(parsed.unknown.is_empty()) || parsed.options_first("help").is_some() {
c996f5c871 2026-01-12 58: println!("SMTP2TG v{}, (C) 2024 - 2026\n\n\
c996f5c871 2026-01-12 59: \t-h|--help\tDisplay this help\n\
c996f5c871 2026-01-12 60: \t-c|--config …\tSet configuration file location.",
c996f5c871 2026-01-12 61: env!("CARGO_PKG_VERSION"));
c996f5c871 2026-01-12 62: return Ok(());
c996f5c871 2026-01-12 63: };
c996f5c871 2026-01-12 64: let config_file = Path::new(if let Some(path) = parsed.options_value_last("config") {
c996f5c871 2026-01-12 65: &path[..]
c996f5c871 2026-01-12 66: } else {
c996f5c871 2026-01-12 67: "smtp2tg.toml"
c996f5c871 2026-01-12 68: });
c996f5c871 2026-01-12 69: if !config_file.exists() {
c996f5c871 2026-01-12 70: bail!("can't read configuration from {config_file:?}");
c996f5c871 2026-01-12 71: };
c996f5c871 2026-01-12 72: {
c996f5c871 2026-01-12 73: let meta = metadata(config_file).await.stack()?;
c996f5c871 2026-01-12 74: if (!0o100600 & meta.permissions().mode()) > 0 {
c996f5c871 2026-01-12 75: bail!("other users can read or write config file {config_file:?}\n\
c996f5c871 2026-01-12 76: File permissions: {:o}", meta.permissions().mode());
c996f5c871 2026-01-12 77: }
c996f5c871 2026-01-12 78: }
c996f5c871 2026-01-12 79: let settings: config::Config = config::Config::builder()
c996f5c871 2026-01-12 80: .set_default("api_gateway", "https://api.telegram.org").stack()?
c996f5c871 2026-01-12 81: .set_default("fields", vec!["date", "from", "subject"]).stack()?
c996f5c871 2026-01-12 82: .set_default("hostname", "smtp.2.tg").stack()?
c996f5c871 2026-01-12 83: .set_default("listen_on", "0.0.0.0:1025").stack()?
c996f5c871 2026-01-12 84: .set_default("unknown", "relay").stack()?
c996f5c871 2026-01-12 85: .set_default("domains", vec!["localhost", hostname::get().stack()?.to_str().expect("Failed to get current hostname")]).stack()?
c996f5c871 2026-01-12 86: .add_source(config::File::from(config_file))
c996f5c871 2026-01-12 87: .build()
c996f5c871 2026-01-12 88: .with_context(|| format!("[{config_file:?}] there was an error reading config\n\
c996f5c871 2026-01-12 89: \tplease consult \"smtp2tg.toml.example\" for details"))?;
c996f5c871 2026-01-12 90:
c996f5c871 2026-01-12 91: let listen_on = settings.get_string("listen_on").stack()?;
c996f5c871 2026-01-12 92: let server_name = settings.get_string("hostname").stack()?;
c996f5c871 2026-01-12 93: let core = MailServer::new(settings)?;
c996f5c871 2026-01-12 94: let mut server = mailin_embedded::Server::new(core);
c996f5c871 2026-01-12 95:
c996f5c871 2026-01-12 96: server.with_name(server_name)
c996f5c871 2026-01-12 97: .with_ssl(mailin_embedded::SslConfig::None).unwrap()
c996f5c871 2026-01-12 98: .with_addr(listen_on).unwrap();
c996f5c871 2026-01-12 99: server.serve().unwrap();
100:
101: Ok(())
102: }