steps:
      # SETUP
      - uses: actions/checkout@v7
        with:
          persist-credentials: false
      - uses: dtolnay/rust-toolchain@stable
      - uses: Swatinem/rust-cache@v2
      - uses: mozilla-actions/sccache-action@v0.0.10
      - uses: mozilla-actions/sccache-action@v0.0.11

      # TESTS
      - name: Run tests
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dependencies = [
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]

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]

[[package]]
name = "web-time"

checksum = "23b97319f7b8343df12cc98938e5c3eb436064524c8d2b4e30a1d3a36eecdf81"
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 "yoke",
 "zerofrom",
]

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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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 "zerovec-derive",
]

[[package]]
name = "zerovec-derive"
version = "0.11.3"
version = "0.11.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
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 "quote",
 "syn 2.0.119",
 "syn 3.0.5",
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[[package]]
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[package]
name = "smtp2tg"
version = "0.6.7"
version = "0.6.8"
authors = [ "arcade@b1t.name" ]
edition = "2024"
license = "0BSD"
repository = "http://fs.b1t.name/smtp2tg"

[dependencies]
async-compat = "0.2.5"
config = { version = "0.15", default-features = false, features = [ "toml" ] }
hostname = "0.4.1"
html-escape = "0.2.13"
clap = { version = "4.6", features = [ "derive" ] }
mail-parser = "0.11"
mailin-embedded = "0.8"
regex = "1.11.1"
smol = "2.0.2"
stacked_errors = "0.7.1"
tgbot = "0.46"
stacked_errors = "0.8"
tgbot = "0.48"

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

# All tests are moved to tests/
[lib]
test = false

[[bin]]
test = false
name = "smtp2tg"

# 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
# default hostname to use when serving requests
# - deny: drop them
unknown = "relay"

hostname = "smtp2tg"
# default fields to show in message header
fields = [ "date", "from", "subject" ]

# which domains are allowed in addresses
# this means that any unqualified recipient "somebody" will also match
# to "somebody@each_domain"
domains = [ "localhost", "current.hostname" ]

# default recipient, should be specified
# still can be a user, channel or group
# still can be a user, channel or group id
default = 0

# default fields to show in message header
fields = [ "date", "from", "subject" ]

[recipients]
# make sure you quote emails, as "@" can't go there unquoted. And by default
# we need FQDNs
# we need FQDNs, also keep in mind emails are case insensitive
"somebody@example.com" = 1 # user id's are positive
"root" = -1 # group id's are negative

# to look up chat/group id you can use debug settings in Telegram clients,
# or some bot like @getidsbot or @RawDataBot

#[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.
/// Main asynchronous entry point for the application. Runs the gateway using
/// the configuration selected on the command line.
///
/// Parses command-line arguments, loads configuration, and starts the SMTP
/// server.
/// 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 configuration is invalid, files are inaccessible, or
/// server fails to start.
/// Returns an error if the configuration file is missing, inaccessible,
/// insecure, malformed, or contains invalid required settings.
///
/// # Panics
/// Panics if configuring or serving the SMTP server fails.
pub async fn async_main () -> Result<()> {
	let args = Args::parse();
	let config_file = Path::new(&args.config);
	if !config_file.exists() {
		bail!("can't read configuration from {config_file:?}");
	if !config_file.try_exists().stack()? {
		bail!("Configuration file not found: {config_file:?}\n\
			Hint: Ensure the file exists and the path is correct.");
	};
	{
		let meta = metadata(config_file).await.stack()?;
		if (!0o100600 & meta.permissions().mode()) > 0 {
			bail!("Configuration file permissions are insecure {config_file:?}\n\
				Current permissions: {:o}\n\
				Required: 0600 (owner read/write only).\n\
			bail!("other users can read or write config file {config_file:?}\n\
				File permissions: {:o}", meta.permissions().mode());
		}
				Fix with: chmod 600 {config_file:?}",
				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("domains", vec!["localhost",
			hostname::get().context("Failed to get current hostname")?
			.to_str().context("Can't convert hostname to string, bad UTF-8?")?]).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"))?;
		.with_context(|| format!(
			"Failed to parse configuration file: {config_file:?}\n\
			Check syntax against smtp2tg.toml.example.\n\
			Common issues: missing quotes, trailing commas in inline tables, or invalid types."
		))?;

	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);

	// TODO: remove unwraps when mailin-embedded bumps with better error handling

	/// validates all required configuration values.
	///
	/// # Arguments
	/// * `settings` - Parsed application configuration.
	///
	/// # Errors
	/// Returns an error if required configuration values are missing or invalid.
	/// server fails to start.
	pub fn new (settings: config::Config) -> Result<MailServer> {
		let api_key = settings.get_string("api_key")
			.context("[smtp2tg.toml] missing \"api_key\" parameter.\n")?;
		let mut recipients = HashMap::new();
		for (name, value) in settings.get_table("recipients")
			.context("[smtp2tg.toml] missing table \"recipients\".\n")?
		{

		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 RE_DOMAIN.is_match(&domain) {
				domains.insert(domain);
			} else {
				bail!("Invalid domain in configuration: '{domain}'\n\
					Domains must be valid (e.g., 'example.com', 'localhost').\n\
				bail!("[smtp2tg.toml] can't check domains in \"domains\": {domain}");
			}
					Check 'domains' array in smtp2tg.toml.");
		}	}
		}
		if domains.is_empty() {
			bail!("No domains, need at least one: default `localhost` would do.");
		}
		let domains = domains.into_iter().map(|s| escape(&s))
		let re_domains = domains.iter().map(|s| escape(s))
			.collect::<Vec<String>>().join("|");
		let address = RegexBuilder::new(&format!("^[a-z0-9][a-z0-9.-]*(@({domains}))?$"))
		let address = RegexBuilder::new(&format!("^[a-z0-9][a-z0-9.-]*(@({re_domains}))?$"))
			.case_insensitive(true).build().stack()?;

		Ok(MailServer {
			data: vec!(),
			headers: None,
			tg,
			fields,

	/// # Returns
	/// * `Result<ChatPeerId>` - Telegram chat ID for the address, or default if
	///   not found.
	pub fn get_id (&self, name: &str) -> Result<&ChatPeerId> {
		if self.address.is_match(name) {
			Ok(self.tg.get(name).unwrap_or(&self.tg.default))
		} else {
			bail!("Doesn't look like address from one of our domains.");
		}
			bail!("Email address {name:?} is not from an allowed domain.");
	}	}
	}

	/// Attempt to deliver one message
	async fn relay_mail (&self) -> Result<()> {
		if let Some(headers) = &self.headers {
			let mail = mail_parser::MessageParser::new().parse(&self.data)
				.context("Failed to parse mail.")?;

use tgbot::{
	api::Client,
	types::{
		ChatPeerId,
		InputFile,
		InputFileReader,
		InputMediaDocument,
		InputText,
		MediaGroup,
		MediaGroupItem,
		Message,
		ParseMode::Html,
		SendDocument,
		SendMediaGroup,
		SendMessage,
		SendDocument,
	},
};

#[derive(Debug)]
pub struct TelegramTransport {
	tg: Client,
	recipients: HashMap<String, ChatPeerId>,

	///
	/// # Returns
	/// * `Result<Message>` - Telegram API response.
	///
	/// # Errors
	/// Returns an error if `msg` contains a closing Telegram tag or sending fails.
	pub async fn debug (&self, msg: &str) -> Result<Message> {
		self.send(&self.default, format!("<pre>{}</pre>", validate(msg).stack()?)).await
		self.send(&self.default, &format!("<pre>{}</pre>", validate(msg).stack()?)).await
	}

	/// Retrieves a chat ID by name.
	///
	/// # Arguments
	/// * `name` - Name or email to look up.
	///
	/// # Returns
	/// * `Result<&ChatPeerId>` - Chat ID if found.
	///
	/// # Errors
	/// Returns an error if `name` is not configured.
	pub fn get (&self, name: &str) -> Result<&ChatPeerId> {
		self.recipients.get(&name.to_lowercase())
			.with_context(|| format!("Recipient \"{name}\" not found in configuration"))
			.with_context(|| format!("Recipient {name:?} not found in configuration"))
	}

	/// Sends a text message to a specified chat.
	///
	/// # Arguments
	/// * `to` - Target chat ID.
	/// * `msg` - Message text (supports HTML formatting).
	///
	/// # Returns
	/// * `Result<Message>` - Telegram API response.
	pub async fn send <S> (&self, to: &ChatPeerId, msg: S) -> Result<Message>
	pub async fn send (&self, to: &ChatPeerId, msg: &str) -> Result<Message> {
	where S: Into<String> + Debug{
		self.tg.execute(
			SendMessage::new(*to, msg)
			SendMessage::new(*to, InputText::from(msg).with_format(Html))
			.with_parse_mode(Html)
		).await.stack()
	}

	/// Sends a message with attachments to a specified chat.
	///
	/// # Arguments
	/// * `to` - Target chat ID.
	/// * `media` - List of attachments, non-empty.
	/// * `msg` - Message text (supports HTML formatting).
	///
	/// # Returns
	/// * `Result<()>` - Success or error.
	/// * `Result<()>` - fails if `media` is empty, problems forming media
	///   group, request fails.
	pub async fn sendgroup (&self, to: &ChatPeerId, media: Vec<Attachment>, msg: &str) -> Result<()> {
		if media.len() > 1 {
			let mut attach = vec![];
			let mut pos = media.len();
			for file in media {
				let mut caption = InputMediaDocument::default();
				let mut doc = InputMediaDocument::from(
				if pos == 1 {
					caption = caption.with_caption(msg)
						.with_caption_parse_mode(Html);
				}
				pos -= 1;
				attach.push(
					MediaGroupItem::for_document(
						InputFile::from(
							InputFileReader::from(file.data)
								.with_file_name(file.name)
					InputFile::from(
						InputFileReader::from(file.data)
							.with_file_name(file.name)
						),
						caption
					)
				);
				if pos == 1 {
					doc = doc.with_caption(InputText::from(msg)
						.with_format(Html));
				}
				pos -= 1;
				attach.push(MediaGroupItem::from(doc));
			}
			self.tg.execute(SendMediaGroup::new(*to, MediaGroup::new(attach).stack()?)).await.stack()?;
		} else {
			if media.is_empty() {
				bail!("At least one attachment is required.");
			}
			self.tg.execute(
				SendDocument::new(
					*to,
					InputFileReader::from(media[0].data.clone())
					.with_file_name(media[0].name.clone())
				).with_caption(msg)
				.with_caption_parse_mode(Html)
						.with_file_name(media[0].name.clone())
				).with_caption(InputText::from(msg)
					.with_format(Html))
			).await.stack()?;
		}
		Ok(())
	}
}

/// # Returns
/// * `Result<Cow<'a, str>>` - Escaped text or error if invalid.
///
/// # Errors
/// Returns an error if the text contains Telegram closing tags (`</pre>`, `</code>`).
pub fn validate <'a>(text: &'a str) -> Result<Cow<'a, str>> {
	if RE_CLOSING.is_match(text) {
		bail!("Telegram closing tag found.");
		bail!("Text contains a Telegram closing tag (e.g., </pre>, </code>).");
	} else {
		Ok(encode_text(text))
	}
}	}
}