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//! 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.
use anyhow::{
use anyhow::Result;
anyhow,
bail,
Result,
};
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relay,
tg,
fields,
}
}
/// Send message to default user, used for debug/log/info purposes
async fn debug<'b, S>(&self, msg: S) -> Result<Message>
where S: Into<String> {
Ok(self.tg.send_message(*self.recipients.get("_").unwrap(), msg).await?)
async fn debug <'a, S> (&self, msg: S) -> Result<Message, MyError>
where S: Into<&'a str> {
let msg = msg.into();
Ok(self.tg.send_message(*self.recipients.get("_").ok_or(MyError::NoDefault)?, encode(msg)).await?)
}
/// Send message to specified user
async fn send<'b, S>(&self, to: &ChatId, msg: S) -> Result<Message>
async fn send <S> (&self, to: &ChatId, msg: S) -> Result<Message, MyError>
where S: Into<String> {
Ok(self.tg.send_message(*to, msg).await?)
}
/// Attempt to deliver one message
async fn relay_mail (&self) -> Result<()> {
async fn relay_mail (&self) -> Result<(), MyError> {
if let Some(headers) = &self.headers {
let mail = mail_parser::MessageParser::new().parse(&self.data)
.ok_or(anyhow!("Failed to parse mail"))?;
.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<&ChatId> = HashSet::new();
if headers.to.is_empty() {
bail!("No recipient addresses.");
return Err(MyError::NoRecipient);
}
for item in &headers.to {
match self.recipients.get(item) {
Some(addr) => rcpt.insert(addr),
None => {
self.debug(format!("Recipient [{}] not found\\.", &item)).await?;
self.debug(&*format!("Recipient [{}] not found.", &item)).await?;
rcpt.insert(self.recipients.get("_")
.ok_or(anyhow!("Missing default address in recipient table\\."))?)
.ok_or(MyError::NoDefault)?)
}
};
};
if rcpt.is_empty() {
self.debug("No recipient or envelope address\\.").await?;
self.debug("No recipient or envelope address.").await?;
rcpt.insert(self.recipients.get("_")
.ok_or(anyhow!("Missing default address in recipient table."))?);
.ok_or(MyError::NoDefault)?);
};
// prepating message header
let mut reply: Vec<Cow<'_, str>> = vec![];
let mut reply: Vec<String> = vec![];
if self.fields.contains("subject") {
if let Some(subject) = mail.subject() {
reply.push(format!("__*Subject:*__ `{}`", subject).into());
reply.push(format!("__*Subject:*__ `{}`", encode(subject)));
} else if let Some(thread) = mail.thread_name() {
reply.push(format!("__*Thread:*__ `{}`", thread).into());
reply.push(format!("__*Thread:*__ `{}`", encode(thread)));
}
}
let mut short_headers: Vec<Cow<'_, str>> = vec![];
let mut short_headers: Vec<String> = vec![];
// do we need to replace spaces here?
if self.fields.contains("from") {
short_headers.push(format!("__*From:*__ `{}`", headers.from).into());
short_headers.push(format!("__*From:*__ `{}`", encode(&headers.from[..])));
}
if self.fields.contains("date") {
if let Some(date) = mail.date() {
short_headers.push(format!("__*Date:*__ `{}`", date).into());
short_headers.push(format!("__*Date:*__ `{}`", date));
}
}
reply.push(short_headers.join(" ").into());
reply.push(short_headers.join(" "));
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.debug(format!("Hm, we have {} HTML parts and {} text parts\\.", html_parts, text_parts)).await?;
self.debug(&*format!("Hm, we have {} HTML parts and {} text parts.", html_parts, text_parts)).await?;
}
//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)
.ok_or(anyhow!("Failed to extract text from message."))?;
.ok_or(MyError::NoText)?;
if text.len() < 4096 - header_size {
body = text;
text_num = 1;
}
};
reply.push("```".into());
reply.extend(body.lines().map(|x| x.into()));
reply.push("```".into());
// and let's collect 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)
.ok_or(anyhow!("Failed to get text part from message"))?);
.ok_or(MyError::NoText)?);
text_num += 1;
}
while file_num < attachments {
files_to_send.push(mail.attachment(file_num)
.ok_or(anyhow!("Failed to get file part from message"))?);
.ok_or(MyError::NoText)?);
file_num += 1;
}
let msg = reply.join("\n");
for chat in rcpt {
if !files_to_send.is_empty() {
let mut files = vec![];
let mut first_one = true;
for chunk in &files_to_send {
let data = chunk.contents();
let mut filename: Option<String> = None;
for header in chunk.headers() {
if header.name() == "Content-Type" {
match header.value() {
mail_parser::HeaderValue::ContentType(contenttype) => {
if let Some(fname) = contenttype.attribute("name") {
filename = Some(fname.to_owned());
}
},
_ => {
self.debug("Attachment has bad ContentType header\\.").await?;
self.debug("Attachment has bad ContentType header.").await?;
},
};
};
};
let filename = if let Some(fname) = filename {
fname
} else {
"Attachment.txt".into()
};
let item = teloxide::types::InputMediaDocument::new(
teloxide::types::InputFile::memory(data.to_vec())
.file_name(filename));
let item = if first_one {
first_one = false;
item.caption(&msg).parse_mode(MarkdownV2)
item.caption(&msg)
} else {
item
};
files.push(InputMedia::Document(item));
}
self.sendgroup(chat, files).await?;
} else {
self.send(chat, &msg).await?;
}
}
} else {
bail!("No headers.");
return Err(MyError::NoHeaders);
}
Ok(())
}
/// Send media to specified user
pub async fn sendgroup<M>(&self, to: &ChatId, media: M) -> Result<Vec<Message>>
pub async fn sendgroup <M> (&self, to: &ChatId, media: M) -> Result<Vec<Message>, MyError>
where M: IntoIterator<Item = InputMedia> {
Ok(self.tg.send_media_group(*to, media).await?)
}
}
impl mailin_embedded::Handler for TelegramTransport {
/// Just deny login auth
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from: from.to_string(),
to: to.to_vec(),
});
OK
}
/// Save chunk(?) of data
fn data(&mut self, buf: &[u8]) -> Result<(), Error> {
fn data (&mut self, buf: &[u8]) -> Result<(), Error> {
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 {
fn data_end (&mut self) -> Response {
let mut result = OK;
task::block_on(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.debug(format!("Sending emails failed:\n{:?}", err)).await {
if let Err(err) = self.debug(&*format!("Sending emails failed:\n{}", err)).await {
// in case that also fails - write some logs and bail
eprintln!("Failed to contact Telegram:\n{:?}", err);
eprintln!("{:?}", err);
};
};
});
// clear - just in case
self.data = vec![];
self.headers = None;
result
}
}
#[async_std::main]
async fn main() -> Result<()> {
async fn main () -> Result<()> {
let specs = OptSpecs::new()
.option("help", "h", OptValueType::None)
.option("help", "help", OptValueType::None)
.option("config", "c", OptValueType::Required)
.option("config", "config", OptValueType::Required)
.flag(OptFlags::OptionsEverywhere);
let mut args = std::env::args();
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