use anyhow::Result;
use async_std::task;
use samotop::{
mail::{
Builder,
DebugService,
MailDir,
Name
},
smtp::{
SmtpParser,
Prudence,
},
};
use telegram_bot::{
Api,
ParseMode,
SendMessage,
UserId,
};
use std::{
borrow::Cow,
collections::{
HashMap,
HashSet,
},
io::Read,
path::{
Path,
PathBuf
},
time::Duration,
vec::Vec,
};
fn address_into_iter<'a>(addr: &'a mail_parser::Address<'a, >) -> impl Iterator<Item = Cow<'a, str>> {
addr.clone().into_list().into_iter().map(|a| a.address.unwrap())
}
fn relay_mails(maildir: &Path, core: &TelegramTransport) -> Result<()> {
let new_dir = maildir.join("new");
std::fs::create_dir_all(&new_dir)?;
let files = std::fs::read_dir(new_dir)?;
for file in files {
let file = file?;
let mut buf = Vec::new();
std::fs::File::open(file.path())?.read_to_end(&mut buf)?;
task::block_on(async move {
match mail_parser::MessageParser::default().parse(&buf[..]) {
Some(mail) => {
let mail = mail.clone();
// Fetching address lists from fields we know
let mut to = HashSet::new();
if let Some(addr) = mail.to() {
let _ = address_into_iter(addr).map(|x| to.insert(x));
};
if let Some(addr) = mail.header("X-Samotop-To") {
match addr {
mail_parser::HeaderValue::Address(addr) => {
let _ = address_into_iter(addr).map(|x| to.insert(x));
},
mail_parser::HeaderValue::Text(text) => {
to.insert(text.clone());
},
_ => {}
}
};
// Adding all known addresses to recipient list, for anyone else adding default
// Also if list is empty also adding default
let mut rcpt: HashSet<UserId> = HashSet::new();
for item in to {
let item = item.into_owned();
if core.recipients.contains_key(&item) {
rcpt.insert(core.recipients[&item]);
} else {
core.debug(format!("Recipient [{}] not found.", &item)).await.unwrap();
rcpt.insert(core.default);
}
};
if rcpt.is_empty() {
rcpt.insert(core.default);
core.debug("No recipient or envelope address.").await.unwrap();
};
// prepating message header
let mut reply: Vec<Cow<str>> = vec![];
if let Some(subject) = mail.subject() {
reply.push(format!("**Subject:** `{}`", subject).into());
} else if let Some(thread) = mail.thread_name() {
reply.push(format!("**Thread:** `{}`", thread).into());
}
if let Some(from) = mail.from() {
reply.push(format!("**From:** `{:?}`", address_into_iter(from).collect::<Vec<_>>().join(", ")).into());
}
if let Some(sender) = mail.sender() {
reply.push(format!("**Sender:** `{:?}`", address_into_iter(sender).collect::<Vec<_>>().join(", ")).into());
}
reply.push("".into());
let header_size = reply.join("\n").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 {
core.debug(format!("Hm, we have {} HTML parts and {} text parts.", html_parts, text_parts)).await.unwrap();
}
//let mut html_num = 0;
let mut text_num = 0;
let mut file_num = 0;
// let's display first html or text part as body
let mut body = "".into();
/*
* actually I don't wanna parse that html stuff
if html_parts > 0 {
let text = mail.body_html(0).unwrap();
if text.len() < 4096 - header_size {
body = text;
html_num = 1;
}
};
*/
if body == "" && text_parts > 0 {
let text = mail.body_text(0).unwrap();
if text.len() < 4096 - header_size {
body = text;
text_num = 1;
}
};
reply.push("```".into());
for line in body.lines() {
reply.push(line.into());
}
reply.push("```".into());
// and let's coillect all other attachment parts
let mut files_to_send = vec![];
/*
* let's just skip html parts for now, they just duplicate text?
while html_num < html_parts {
files_to_send.push(mail.html_part(html_num).unwrap());
html_num += 1;
}
*/
while text_num < text_parts {
files_to_send.push(mail.text_part(text_num).unwrap());
text_num += 1;
}
while file_num < attachments {
files_to_send.push(mail.attachment(file_num).unwrap());
file_num += 1;
}
for chat in rcpt {
core.send(chat, reply.join("\n")).await.unwrap();
for chunk in &files_to_send {
let data = chunk.contents().to_vec();
let obj = telegram_bot::types::InputFileUpload::with_data(data, "Attachment");
core.sendfile(chat, obj).await.unwrap();
}
}
},
None => { core.debug("None mail.").await.unwrap(); },
//send_to_sendgrid(mail, sendgrid_api_key).await;
};
});
std::fs::remove_file(file.path())?;
}
Ok(())
}
fn my_prudence() -> Prudence {
Prudence::default().with_read_timeout(Duration::from_secs(60)).with_banner_delay(Duration::from_secs(1))
}
pub struct TelegramTransport {
default: UserId,
tg: Api,
recipients: HashMap<String, UserId>,
}
impl TelegramTransport {
pub fn new(settings: &config::Config) -> TelegramTransport {
let api_key = settings.get_string("api_key").unwrap();
let tg = Api::new(api_key);
let default_recipient = settings.get_string("default").unwrap();
let recipients: HashMap<String, UserId> = settings.get_table("recipients").unwrap().into_iter().map(|(a, b)| (a, UserId::new(b.into_int().unwrap()))).collect();
// Barf if no default
let default = recipients[&default_recipient];
TelegramTransport {
default,
tg,
recipients,
}
}
pub async fn debug<'b, S>(&self, msg: S) -> Result<()>
where S: Into<Cow<'b, str>> {
task::sleep(Duration::from_secs(5)).await;
self.tg.send(SendMessage::new(self.default, msg)
.parse_mode(ParseMode::Markdown)).await?;
Ok(())
}
pub async fn send<'b, S>(&self, to: UserId, msg: S) -> Result<()>
where S: Into<Cow<'b, str>> {
task::sleep(Duration::from_secs(5)).await;
self.tg.send(SendMessage::new(to, msg)
.parse_mode(ParseMode::Markdown)).await?;
Ok(())
}
pub async fn sendfile<V>(&self, to: UserId, chunk: V) -> Result<()>
where V: Into<telegram_bot::InputFile> {
task::sleep(Duration::from_secs(5)).await;
self.tg.send(telegram_bot::SendDocument::new(to, chunk)).await?;
Ok(())
}
}
#[async_std::main]
async fn main() {
let settings: config::Config = config::Config::builder()
.add_source(config::File::with_name("smtp2tg.toml"))
.build().unwrap();
let core = TelegramTransport::new(&settings);
let maildir: PathBuf = settings.get_string("maildir").unwrap().into();
let listen_on = settings.get_string("listen_on").unwrap();
let sink = Builder + Name::new("smtp2tg") + DebugService +
my_prudence() + MailDir::new(maildir.clone()).unwrap();
task::spawn(async move {
loop {
relay_mails(&maildir, &core).unwrap();
task::sleep(Duration::from_secs(5)).await;
}
});
match listen_on.as_str() {
"socket" => {
let sink = sink + samotop::smtp::Lmtp.with(SmtpParser);
samotop::server::UnixServer::on("./smtp2tg.sock")
.serve(sink.build()).await.unwrap();
},
_ => {
let sink = sink + samotop::smtp::Esmtp.with(SmtpParser);
samotop::server::TcpServer::on(listen_on)
.serve(sink.build()).await.unwrap();
},
};
}