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OptValue,
};
use lazy_static::lazy_static;
use mailin_embedded::{
Response,
response::*,
};
use regex::Regex;
use regex::{
Regex,
escape,
};
use tgbot::{
api::Client,
types::{
ChatPeerId,
InputFile,
InputFileReader,
InputMediaDocument,
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struct TelegramTransport {
data: Vec<u8>,
headers: Option<SomeHeaders>,
recipients: HashMap<String, ChatPeerId>,
relay: bool,
tg: Client,
fields: HashSet<String>,
address: Regex,
}
lazy_static! {
static ref RE_SPECIAL: Regex = Regex::new(r"([\-_*\[\]()~`>#+|{}\.!])").unwrap();
static ref RE_DOMAIN: Regex = Regex::new(r"^[a-z0-9]([-a-z0-9]*[a-z0-9])?(\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*$").unwrap();
}
/// Encodes special HTML entities to prevent them interfering with Telegram HTML
fn encode (text: &str) -> Cow<'_, str> {
RE_SPECIAL.replace_all(text, "\\$1")
}
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eprintln!("[smtp2tg.toml] \"recipient\" table misses \"default_recipient\".\n");
panic!("no default recipient");
}
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 value = settings.get_string("unknown");
let mut domains: HashSet<String> = HashSet::new();
let extra_domains = settings.get_array("domains").unwrap();
for domain in extra_domains {
let domain = domain.to_string().to_lowercase();
if RE_DOMAIN.is_match(&domain) {
domains.insert(domain);
} else {
panic!("[smtp2tg.toml] can't check of domains in \"domains\": {domain}");
}
}
let domains = domains.into_iter().map(|s| escape(&s))
.collect::<Vec<String>>().join("|");
let address = Regex::new(&format!("^(?P<user>[a-z0-9][-a-z0-9])(@({domains}))$")).unwrap();
let relay = match value {
Ok(value) => {
match value.as_str() {
"relay" => true,
"deny" => false,
_ => {
eprintln!("[smtp2tg.toml] \"unknown\" should be either \"relay\" or \"deny\".\n");
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TelegramTransport {
data: vec!(),
headers: None,
recipients,
relay,
tg,
fields,
address,
}
}
/// Send message to default user, used for debug/log/info purposes
async fn debug (&self, msg: &str) -> Result<Message, MyError> {
self.send(self.recipients.get("_").ok_or(MyError::NoDefault)?, encode(msg)).await
}
/// Send message to specified user
async fn send <S> (&self, to: &ChatPeerId, msg: S) -> Result<Message, MyError>
where S: Into<String> {
Ok(self.tg.execute(
SendMessage::new(*to, msg)
.with_parse_mode(MarkdownV2)
).await?)
}
/// Returns id for provided email address
fn get_id (&self, name: &str) -> Result<&ChatPeerId, MyError> {
// here we need to store String locally to borrow it after
let mut link = name;
let name: String;
if let Some(caps) = self.address.captures(link) {
name = caps["name"].to_string();
link = &name;
}
match self.recipients.get(link) {
Some(addr) => Ok(addr),
None => {
self.recipients.get("_")
.ok_or(MyError::NoDefault)
}
}
}
/// Attempt to deliver one message
async fn relay_mail (&self) -> Result<(), MyError> {
if let Some(headers) = &self.headers {
let mail = mail_parser::MessageParser::new().parse(&self.data)
.ok_or(MyError::BadMail)?;
// Adding all known addresses to recipient list, for anyone else adding default
// Also if list is empty also adding default
let mut rcpt: HashSet<&ChatPeerId> = HashSet::new();
if headers.to.is_empty() {
return Err(MyError::NoRecipient);
}
for item in &headers.to {
match self.recipients.get(item) {
Some(addr) => rcpt.insert(addr),
None => {
self.debug(&format!("Recipient [{item}] not found.")).await?;
rcpt.insert(self.recipients.get("_")
.ok_or(MyError::NoDefault)?)
}
};
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}
/// Verify whether address is deliverable
fn rcpt (&mut self, to: &str) -> Response {
if self.relay {
OK
} else {
match self.recipients.get(to) {
Some(_) => OK,
None => {
match self.get_id(to) {
Ok(_) => OK,
Err(_) => {
if self.relay {
OK
} else {
NO_MAILBOX
}
}
}
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}
}
let settings: config::Config = config::Config::builder()
.set_default("fields", vec!["date", "from", "subject"]).unwrap()
.set_default("hostname", "smtp.2.tg").unwrap()
.set_default("listen_on", "0.0.0.0:1025").unwrap()
.set_default("unknown", "relay").unwrap()
.set_default("domains", vec!["localhost", hostname::get()?.to_str().expect("Failed to get current hostname")]).unwrap()
.add_source(config::File::from(config_file))
.build()
.unwrap_or_else(|_| panic!("[{config_file:?}] there was an error reading config\n\
\tplease consult \"smtp2tg.toml.example\" for details"));
let listen_on = settings.get_string("listen_on")?;
let server_name = settings.get_string("hostname")?;
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