checksum = "924ed96dd52d1b75e9c1a3e6275715fd320f5f9439fb5a4a11fa51f4221158d2"
dependencies = [
 "concurrent-queue",
 "event-listener-strategy",
 "futures-core",
 "pin-project-lite",
]

[[package]]
name = "async-compat"
version = "0.2.5"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "a1ba85bc55464dcbf728b56d97e119d673f4cf9062be330a9a26f3acf504a590"
dependencies = [
 "futures-core",
 "futures-io",
 "once_cell",
 "pin-project-lite",
 "tokio",
]

[[package]]
name = "async-executor"
version = "1.13.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "497c00e0fd83a72a79a39fcbd8e3e2f055d6f6c7e025f3b3d91f4f8e76527fb8"
dependencies = [

 "async-process",
 "blocking",
 "futures-lite",
]

[[package]]
name = "smtp2tg"
version = "0.5.3"
dependencies = [
 "async-compat",
 "config",
 "hostname",
 "just-getopt",
 "lazy_static",
 "mail-parser",
 "mailin-embedded",
 "regex",
 "smol",
 "stacked_errors",
 "tgbot",
 "tokio",
]

[[package]]
name = "socket2"
version = "0.6.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "17129e116933cf371d018bb80ae557e889637989d8638274fb25622827b03881"

checksum = "ff360e02eab121e0bc37a2d3b4d4dc622e6eda3a8e5253d5435ecf5bd4c68408"
dependencies = [
 "bytes",
 "libc",
 "mio",
 "pin-project-lite",
 "socket2",
 "tokio-macros",
 "windows-sys 0.61.2",
]

[[package]]
name = "tokio-macros"
version = "2.6.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "af407857209536a95c8e56f8231ef2c2e2aff839b22e07a1ffcbc617e9db9fa5"
dependencies = [
 "proc-macro2",
 "quote",
 "syn",
]

[[package]]
name = "tokio-rustls"
version = "0.26.4"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "1729aa945f29d91ba541258c8df89027d5792d85a8841fb65e8bf0f4ede4ef61"
dependencies = [

[package]
name = "smtp2tg"
version = "0.5.3"
authors = [ "arcade" ]
edition = "2021"

[dependencies]
async-compat = "0.2.5"
config = { version = "0.15", default-features = false, features = [ "toml" ] }
hostname = "0.4.1"
just-getopt = "2.0.0"
lazy_static = "1.5.0"
mail-parser = { version = "0.11", features = ["serde"] }
mailin-embedded = "^0"
regex = "1.11.1"
smol = "2.0.2"
stacked_errors = "0.7.1"
tgbot = "0.40"
tokio = { version = "~1", features = [ "macros", "rt" ] }

[profile.release]
lto = true
codegen-units = 1

# vi:ft=toml:
# Telegram API key
api_key = "YOU_KNOW_WHERE_TO_GET_THIS"

# Telegram API gateway (when you are running your own)
api_gateway = "https://api.telegram.org" # <- note no trailing slash

# where to listen on (sockets are not supported since 0.3.0)
listen_on = "0.0.0.0:25"

# whether we need to handle unknown adresses
# - relay: send them to default one
# - deny: drop them
unknown = "relay"

		HashMap,
		HashSet,
	},
	io::Error,
	sync::Arc,
};

use async_compat::Compat;
use mailin_embedded::{
	Response,
	response::{
		INTERNAL_ERROR,
		INVALID_CREDENTIALS,
		NO_MAILBOX,
		OK

		for (name, value) in settings.get_table("recipients")
			.expect("[smtp2tg.toml] missing table \"recipients\".\n")
		{
			let value = value.into_int()
				.context("[smtp2tg.toml] \"recipient\" table values should be integers.\n")?;
			recipients.insert(name, value);
		}



		let tg = Arc::new(TelegramTransport::new(api_key, recipients, &settings)?);
		let fields = HashSet::<String>::from_iter(settings.get_array("fields")
			.expect("[smtp2tg.toml] \"fields\" should be an array")
			.iter().map(|x| x.clone().into_string().expect("should be strings")));
		let mut domains: HashSet<String> = HashSet::new();
		let extra_domains = settings.get_array("domains").stack()?;
		for domain in extra_domains {
			let domain = domain.to_string().to_lowercase();

			if self.fields.contains("subject") {
				if let Some(subject) = mail.subject() {
					reply.push(format!("__*Subject:*__ `{}`", encode(subject)));
				} else if let Some(thread) = mail.thread_name() {
					reply.push(format!("__*Thread:*__ `{}`", encode(thread)));
				}
			}

			// do we need to replace spaces here?
			if self.fields.contains("from") {
				reply.push(format!("__*From:*__ `{}`", encode(&headers.from)));
			}
			if self.fields.contains("date") {
				if let Some(date) = mail.date() {
					reply.push(format!("__*Date:*__ `{date}`"));
				}
			}

			let header_size = reply.join(" ").len() + 1;

			let html_parts = mail.html_body_count();
			let text_parts = mail.text_body_count();
			let attachments = mail.attachment_count();
			if html_parts != text_parts {
				self.tg.debug(&format!("Hm, we have {html_parts} HTML parts and {text_parts} text parts.")).await?;

		self.data.append(buf.to_vec().as_mut());
		Ok(())
	}

	/// Attempt to send email, return temporary error if that fails
	fn data_end (&mut self) -> Response {
		let mut result = OK;
		smol::block_on(Compat::new(async {
			// relay mail
			if let Err(err) = self.relay_mail().await {
				result = INTERNAL_ERROR;
				// in case that fails - inform default recipient
				if let Err(err) = self.tg.debug(&format!("Sending emails failed:\n{err:?}")).await {
					// in case that also fails - write some logs and bail
					eprintln!("{err:?}");
				};
			};
		}));
		// clear - just in case
		self.data = vec![];
		self.headers = None;
		result
	}
}

//! 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.

mod mail;
mod telegram;
mod utils;

#[cfg(test)]
mod tests;

use crate::mail::MailServer;

use smol::{
	fs::metadata,
};
use just_getopt::{
	OptFlags,
	OptSpecs,
	OptValue,
};
use stacked_errors::{
	Result,
	StackableErr,
	bail,
};

use std::{
	io::Cursor,
	os::unix::fs::PermissionsExt,
	path::Path,
};

#[tokio::main(flavor = "current_thread")]
async fn main () -> Result<()> {

	let specs = OptSpecs::new()
		.option("help", "h", OptValue::None)
		.option("help", "help", OptValue::None)
		.option("config", "c", OptValue::Required)
		.option("config", "config", OptValue::Required)
		.flag(OptFlags::OptionsEverywhere);
	let mut args = std::env::args();
	args.next();
	let parsed = specs.getopt(args);
	for u in &parsed.unknown {
		println!("Unknown option: {u}");
	}
	if !(parsed.unknown.is_empty()) || parsed.options_first("help").is_some() {
		println!("SMTP2TG v{}, (C) 2024 - 2025\n\n\
			\t-h|--help\tDisplay this help\n\
			\t-c|--config …\tSet configuration file location.",
			env!("CARGO_PKG_VERSION"));
		return Ok(());
	};
	let config_file = Path::new(if let Some(path) = parsed.options_value_last("config") {
		&path[..]
	} else {
		"smtp2tg.toml"
	});
	if !config_file.exists() {
		bail!("can't read configuration from {config_file:?}");
	};
	{
		let meta = metadata(config_file).await.stack()?;
		if (!0o100600 & meta.permissions().mode()) > 0 {
			bail!("other users can read or write config file {config_file:?}\n\
				File permissions: {:o}", meta.permissions().mode());
		}
	}
	let settings: config::Config = config::Config::builder()
		.set_default("api_gateway", "https://api.telegram.org").stack()?
		.set_default("fields", vec!["date", "from", "subject"]).stack()?
		.set_default("hostname", "smtp.2.tg").stack()?
		.set_default("listen_on", "0.0.0.0:1025").stack()?
		.set_default("unknown", "relay").stack()?
		.set_default("domains", vec!["localhost", hostname::get().stack()?.to_str().expect("Failed to get current hostname")]).stack()?
		.add_source(config::File::from(config_file))
		.build()
		.with_context(|| format!("[{config_file:?}] there was an error reading config\n\
			\tplease consult \"smtp2tg.toml.example\" for details"))?;

	let listen_on = settings.get_string("listen_on").stack()?;
	let server_name = settings.get_string("hostname").stack()?;
	let core = MailServer::new(settings)?;
	let mut server = mailin_embedded::Server::new(core);

	server.with_name(server_name)
		.with_ssl(mailin_embedded::SslConfig::None).unwrap()
		.with_addr(listen_on).unwrap();
	server.serve().unwrap();

	Ok(())

}

	tg: Client,
	recipients: HashMap<String, ChatPeerId>,
	pub default: ChatPeerId,
}

impl TelegramTransport {

	pub fn new (api_key: String, recipients: HashMap<String, i64>, settings: &config::Config) -> Result<TelegramTransport> {
		let default = settings.get_int("default")
			.context("[smtp2tg.toml] missing \"default\" recipient.\n")?;
		let api_gateway = settings.get_string("api_gateway")
			.context("[smtp2tg.toml] missing \"api_gateway\" destination.\n")?;
		let tg = Client::new(api_key)
			.context("Failed to create API.\n")?
			.with_host(api_gateway);
		let recipients = recipients.into_iter()
			.map(|(a, b)| (a, ChatPeerId::from(b))).collect();
		let default = ChatPeerId::from(default);

		Ok(TelegramTransport {
			tg,
			recipients,