1db9dbe390 2024-11-28 1: //! Simple SMTP-to-Telegram gateway. Can parse email and send them as telegram
1db9dbe390 2024-11-28 2: //! messages to specified chats, generally you specify which email address is
1db9dbe390 2024-11-28 3: //! available in configuration, everything else is sent to default address.
1db9dbe390 2024-11-28 4:
65b2967a92 2025-01-25 5: use anyhow::Result;
1db9dbe390 2024-11-28 6: use async_std::{
cfe321bd6f 2025-01-23 7: fs::metadata,
1db9dbe390 2024-11-28 8: io::Error,
1db9dbe390 2024-11-28 9: task,
1db9dbe390 2024-11-28 10: };
e66352b9cc 2025-01-21 11: use just_getopt::{
e66352b9cc 2025-01-21 12: OptFlags,
e66352b9cc 2025-01-21 13: OptSpecs,
6887d3b7f9 2025-06-05 14: OptValue,
e66352b9cc 2025-01-21 15: };
65b2967a92 2025-01-25 16: use lazy_static::lazy_static;
1db9dbe390 2024-11-28 17: use mailin_embedded::{
1db9dbe390 2024-11-28 18: Response,
1db9dbe390 2024-11-28 19: response::*,
1db9dbe390 2024-11-28 20: };
65b2967a92 2025-01-25 21: use regex::Regex;
d96b1b4710 2025-06-11 22: use tgbot::{
d96b1b4710 2025-06-11 23: api::Client,
1db9dbe390 2024-11-28 24: types::{
d96b1b4710 2025-06-11 25: ChatPeerId,
d96b1b4710 2025-06-11 26: InputFile,
d96b1b4710 2025-06-11 27: InputFileReader,
d96b1b4710 2025-06-11 28: InputMediaDocument,
d96b1b4710 2025-06-11 29: MediaGroup,
d96b1b4710 2025-06-11 30: MediaGroupItem,
866aad57a4 2024-06-15 31: Message,
866aad57a4 2024-06-15 32: ParseMode::MarkdownV2,
d96b1b4710 2025-06-11 33: SendDocument,
d96b1b4710 2025-06-11 34: SendMediaGroup,
d96b1b4710 2025-06-11 35: SendMessage,
866aad57a4 2024-06-15 36: },
866aad57a4 2024-06-15 37: };
65b2967a92 2025-01-25 38: use thiserror::Error;
7620f854a7 2024-05-21 39:
7620f854a7 2024-05-21 40: use std::{
7620f854a7 2024-05-21 41: borrow::Cow,
61238a3618 2024-05-22 42: collections::{
61238a3618 2024-05-22 43: HashMap,
61238a3618 2024-05-22 44: HashSet,
7620f854a7 2024-05-21 45: },
d96b1b4710 2025-06-11 46: io::Cursor,
cfe321bd6f 2025-01-23 47: os::unix::fs::PermissionsExt,
e66352b9cc 2025-01-21 48: path::Path,
7620f854a7 2024-05-21 49: vec::Vec,
7620f854a7 2024-05-21 50: };
65b2967a92 2025-01-25 51:
65b2967a92 2025-01-25 52: #[derive(Error, Debug)]
65b2967a92 2025-01-25 53: pub enum MyError {
65b2967a92 2025-01-25 54: #[error("Failed to parse mail")]
65b2967a92 2025-01-25 55: BadMail,
65b2967a92 2025-01-25 56: #[error("Missing default address in recipient table")]
65b2967a92 2025-01-25 57: NoDefault,
65b2967a92 2025-01-25 58: #[error("No headers found")]
65b2967a92 2025-01-25 59: NoHeaders,
65b2967a92 2025-01-25 60: #[error("No recipient addresses")]
65b2967a92 2025-01-25 61: NoRecipient,
65b2967a92 2025-01-25 62: #[error("Failed to extract text from message")]
65b2967a92 2025-01-25 63: NoText,
65b2967a92 2025-01-25 64: #[error(transparent)]
d96b1b4710 2025-06-11 65: RequestError(#[from] tgbot::api::ExecuteError),
6887d3b7f9 2025-06-05 66: #[error(transparent)]
6887d3b7f9 2025-06-05 67: TryFromIntError(#[from] std::num::TryFromIntError),
d96b1b4710 2025-06-11 68: #[error(transparent)]
d96b1b4710 2025-06-11 69: InputMediaError(#[from] tgbot::types::InputMediaError),
d96b1b4710 2025-06-11 70: #[error(transparent)]
d96b1b4710 2025-06-11 71: MediaGroupError(#[from] tgbot::types::MediaGroupError),
65b2967a92 2025-01-25 72: }
1db9dbe390 2024-11-28 73:
1db9dbe390 2024-11-28 74: /// `SomeHeaders` object to store data through SMTP session
1db9dbe390 2024-11-28 75: #[derive(Clone, Debug)]
1db9dbe390 2024-11-28 76: struct SomeHeaders {
1db9dbe390 2024-11-28 77: from: String,
1db9dbe390 2024-11-28 78: to: Vec<String>,
1db9dbe390 2024-11-28 79: }
1db9dbe390 2024-11-28 80:
d96b1b4710 2025-06-11 81: struct Attachment {
d96b1b4710 2025-06-11 82: data: Cursor<Vec<u8>>,
d96b1b4710 2025-06-11 83: name: String,
d96b1b4710 2025-06-11 84: }
d96b1b4710 2025-06-11 85:
1db9dbe390 2024-11-28 86: /// `TelegramTransport` Central object with TG api and configuration
1db9dbe390 2024-11-28 87: #[derive(Clone)]
1db9dbe390 2024-11-28 88: struct TelegramTransport {
1db9dbe390 2024-11-28 89: data: Vec<u8>,
1db9dbe390 2024-11-28 90: headers: Option<SomeHeaders>,
d96b1b4710 2025-06-11 91: recipients: HashMap<String, ChatPeerId>,
1db9dbe390 2024-11-28 92: relay: bool,
d96b1b4710 2025-06-11 93: tg: Client,
28fde40f7a 2024-12-27 94: fields: HashSet<String>,
65b2967a92 2025-01-25 95: }
65b2967a92 2025-01-25 96:
65b2967a92 2025-01-25 97: lazy_static! {
65b2967a92 2025-01-25 98: static ref RE_SPECIAL: Regex = Regex::new(r"([\-_*\[\]()~`>#+|{}\.!])").unwrap();
65b2967a92 2025-01-25 99: }
65b2967a92 2025-01-25 100:
65b2967a92 2025-01-25 101: /// Encodes special HTML entities to prevent them interfering with Telegram HTML
65b2967a92 2025-01-25 102: fn encode (text: &str) -> Cow<'_, str> {
65b2967a92 2025-01-25 103: RE_SPECIAL.replace_all(text, "\\$1")
65b2967a92 2025-01-25 104: }
65b2967a92 2025-01-25 105:
65b2967a92 2025-01-25 106: #[cfg(test)]
65b2967a92 2025-01-25 107: mod tests {
65b2967a92 2025-01-25 108: use crate::encode;
65b2967a92 2025-01-25 109:
65b2967a92 2025-01-25 110: #[test]
65b2967a92 2025-01-25 111: fn check_regex () {
65b2967a92 2025-01-25 112: let res = encode("-_*[]()~`>#+|{}.!");
65b2967a92 2025-01-25 113: assert_eq!(res, "\\-\\_\\*\\[\\]\\(\\)\\~\\`\\>\\#\\+\\|\\{\\}\\.\\!");
65b2967a92 2025-01-25 114: }
61238a3618 2024-05-22 115: }
61238a3618 2024-05-22 116:
61238a3618 2024-05-22 117: impl TelegramTransport {
1db9dbe390 2024-11-28 118: /// Initialize API and read configuration
1db9dbe390 2024-11-28 119: fn new(settings: config::Config) -> TelegramTransport {
d96b1b4710 2025-06-11 120: let tg = Client::new(settings.get_string("api_key")
f4cad2a5c0 2024-05-26 121: .expect("[smtp2tg.toml] missing \"api_key\" parameter.\n"))
d96b1b4710 2025-06-11 122: .expect("Failed to create API.\n");
d96b1b4710 2025-06-11 123: let recipients: HashMap<String, ChatPeerId> = settings.get_table("recipients")
da7fc7983d 2024-05-23 124: .expect("[smtp2tg.toml] missing table \"recipients\".\n")
d96b1b4710 2025-06-11 125: .into_iter().map(|(a, b)| (a, ChatPeerId::from(b.into_int()
da7fc7983d 2024-05-23 126: .expect("[smtp2tg.toml] \"recipient\" table values should be integers.\n")
da7fc7983d 2024-05-23 127: ))).collect();
da7fc7983d 2024-05-23 128: if !recipients.contains_key("_") {
da7fc7983d 2024-05-23 129: eprintln!("[smtp2tg.toml] \"recipient\" table misses \"default_recipient\".\n");
da7fc7983d 2024-05-23 130: panic!("no default recipient");
da7fc7983d 2024-05-23 131: }
28fde40f7a 2024-12-27 132: let fields = HashSet::<String>::from_iter(settings.get_array("fields")
28fde40f7a 2024-12-27 133: .expect("[smtp2tg.toml] \"fields\" should be an array")
28fde40f7a 2024-12-27 134: .iter().map(|x| x.clone().into_string().expect("should be strings")));
1db9dbe390 2024-11-28 135: let value = settings.get_string("unknown");
1db9dbe390 2024-11-28 136: let relay = match value {
1db9dbe390 2024-11-28 137: Ok(value) => {
1db9dbe390 2024-11-28 138: match value.as_str() {
1db9dbe390 2024-11-28 139: "relay" => true,
1db9dbe390 2024-11-28 140: "deny" => false,
1db9dbe390 2024-11-28 141: _ => {
1db9dbe390 2024-11-28 142: eprintln!("[smtp2tg.toml] \"unknown\" should be either \"relay\" or \"deny\".\n");
1db9dbe390 2024-11-28 143: panic!("bad setting");
1db9dbe390 2024-11-28 144: },
1db9dbe390 2024-11-28 145: }
1db9dbe390 2024-11-28 146: },
1db9dbe390 2024-11-28 147: Err(err) => {
c808d500e6 2025-03-09 148: eprintln!("[smtp2tg.toml] can't get \"unknown\":\n {err:?}\n");
1db9dbe390 2024-11-28 149: panic!("bad setting");
1db9dbe390 2024-11-28 150: },
1db9dbe390 2024-11-28 151: };
ce79786e06 2024-06-11 152:
ce79786e06 2024-06-11 153: TelegramTransport {
1db9dbe390 2024-11-28 154: data: vec!(),
1db9dbe390 2024-11-28 155: headers: None,
ce79786e06 2024-06-11 156: recipients,
1db9dbe390 2024-11-28 157: relay,
1db9dbe390 2024-11-28 158: tg,
28fde40f7a 2024-12-27 159: fields,
1db9dbe390 2024-11-28 160: }
1db9dbe390 2024-11-28 161: }
1db9dbe390 2024-11-28 162:
1db9dbe390 2024-11-28 163: /// Send message to default user, used for debug/log/info purposes
c808d500e6 2025-03-09 164: async fn debug (&self, msg: &str) -> Result<Message, MyError> {
d96b1b4710 2025-06-11 165: self.send(self.recipients.get("_").ok_or(MyError::NoDefault)?, encode(msg)).await
1db9dbe390 2024-11-28 166: }
1db9dbe390 2024-11-28 167:
1db9dbe390 2024-11-28 168: /// Send message to specified user
d96b1b4710 2025-06-11 169: async fn send <S> (&self, to: &ChatPeerId, msg: S) -> Result<Message, MyError>
1db9dbe390 2024-11-28 170: where S: Into<String> {
d96b1b4710 2025-06-11 171: Ok(self.tg.execute(
d96b1b4710 2025-06-11 172: SendMessage::new(*to, msg)
d96b1b4710 2025-06-11 173: .with_parse_mode(MarkdownV2)
d96b1b4710 2025-06-11 174: ).await?)
1db9dbe390 2024-11-28 175: }
1db9dbe390 2024-11-28 176:
1db9dbe390 2024-11-28 177: /// Attempt to deliver one message
65b2967a92 2025-01-25 178: async fn relay_mail (&self) -> Result<(), MyError> {
1db9dbe390 2024-11-28 179: if let Some(headers) = &self.headers {
1db9dbe390 2024-11-28 180: let mail = mail_parser::MessageParser::new().parse(&self.data)
65b2967a92 2025-01-25 181: .ok_or(MyError::BadMail)?;
1db9dbe390 2024-11-28 182:
1db9dbe390 2024-11-28 183: // Adding all known addresses to recipient list, for anyone else adding default
1db9dbe390 2024-11-28 184: // Also if list is empty also adding default
d96b1b4710 2025-06-11 185: let mut rcpt: HashSet<&ChatPeerId> = HashSet::new();
1db9dbe390 2024-11-28 186: if headers.to.is_empty() {
65b2967a92 2025-01-25 187: return Err(MyError::NoRecipient);
1db9dbe390 2024-11-28 188: }
1db9dbe390 2024-11-28 189: for item in &headers.to {
1db9dbe390 2024-11-28 190: match self.recipients.get(item) {
1db9dbe390 2024-11-28 191: Some(addr) => rcpt.insert(addr),
1db9dbe390 2024-11-28 192: None => {
c808d500e6 2025-03-09 193: self.debug(&format!("Recipient [{item}] not found.")).await?;
1db9dbe390 2024-11-28 194: rcpt.insert(self.recipients.get("_")
65b2967a92 2025-01-25 195: .ok_or(MyError::NoDefault)?)
1db9dbe390 2024-11-28 196: }
1db9dbe390 2024-11-28 197: };
1db9dbe390 2024-11-28 198: };
1db9dbe390 2024-11-28 199: if rcpt.is_empty() {
65b2967a92 2025-01-25 200: self.debug("No recipient or envelope address.").await?;
1db9dbe390 2024-11-28 201: rcpt.insert(self.recipients.get("_")
65b2967a92 2025-01-25 202: .ok_or(MyError::NoDefault)?);
1db9dbe390 2024-11-28 203: };
1db9dbe390 2024-11-28 204:
1db9dbe390 2024-11-28 205: // prepating message header
65b2967a92 2025-01-25 206: let mut reply: Vec<String> = vec![];
28fde40f7a 2024-12-27 207: if self.fields.contains("subject") {
28fde40f7a 2024-12-27 208: if let Some(subject) = mail.subject() {
65b2967a92 2025-01-25 209: reply.push(format!("__*Subject:*__ `{}`", encode(subject)));
28fde40f7a 2024-12-27 210: } else if let Some(thread) = mail.thread_name() {
65b2967a92 2025-01-25 211: reply.push(format!("__*Thread:*__ `{}`", encode(thread)));
28fde40f7a 2024-12-27 212: }
28fde40f7a 2024-12-27 213: }
65b2967a92 2025-01-25 214: let mut short_headers: Vec<String> = vec![];
3d13e7f81d 2024-12-28 215: // do we need to replace spaces here?
28fde40f7a 2024-12-27 216: if self.fields.contains("from") {
c808d500e6 2025-03-09 217: short_headers.push(format!("__*From:*__ `{}`", encode(&headers.from)));
28fde40f7a 2024-12-27 218: }
28fde40f7a 2024-12-27 219: if self.fields.contains("date") {
28fde40f7a 2024-12-27 220: if let Some(date) = mail.date() {
c808d500e6 2025-03-09 221: short_headers.push(format!("__*Date:*__ `{date}`"));
28fde40f7a 2024-12-27 222: }
28fde40f7a 2024-12-27 223: }
65b2967a92 2025-01-25 224: reply.push(short_headers.join(" "));
3d13e7f81d 2024-12-28 225: let header_size = reply.join(" ").len() + 1;
1db9dbe390 2024-11-28 226:
1db9dbe390 2024-11-28 227: let html_parts = mail.html_body_count();
1db9dbe390 2024-11-28 228: let text_parts = mail.text_body_count();
1db9dbe390 2024-11-28 229: let attachments = mail.attachment_count();
1db9dbe390 2024-11-28 230: if html_parts != text_parts {
c808d500e6 2025-03-09 231: self.debug(&format!("Hm, we have {html_parts} HTML parts and {text_parts} text parts.")).await?;
1db9dbe390 2024-11-28 232: }
1db9dbe390 2024-11-28 233: //let mut html_num = 0;
1db9dbe390 2024-11-28 234: let mut text_num = 0;
1db9dbe390 2024-11-28 235: let mut file_num = 0;
1db9dbe390 2024-11-28 236: // let's display first html or text part as body
6887d3b7f9 2025-06-05 237: let mut body: Cow<'_, str> = "".into();
1db9dbe390 2024-11-28 238: /*
1db9dbe390 2024-11-28 239: * actually I don't wanna parse that html stuff
1db9dbe390 2024-11-28 240: if html_parts > 0 {
1db9dbe390 2024-11-28 241: let text = mail.body_html(0).unwrap();
1db9dbe390 2024-11-28 242: if text.len() < 4096 - header_size {
1db9dbe390 2024-11-28 243: body = text;
1db9dbe390 2024-11-28 244: html_num = 1;
1db9dbe390 2024-11-28 245: }
1db9dbe390 2024-11-28 246: };
1db9dbe390 2024-11-28 247: */
6887d3b7f9 2025-06-05 248: if body.is_empty() && text_parts > 0 {
1db9dbe390 2024-11-28 249: let text = mail.body_text(0)
65b2967a92 2025-01-25 250: .ok_or(MyError::NoText)?;
1db9dbe390 2024-11-28 251: if text.len() < 4096 - header_size {
1db9dbe390 2024-11-28 252: body = text;
1db9dbe390 2024-11-28 253: text_num = 1;
1db9dbe390 2024-11-28 254: }
1db9dbe390 2024-11-28 255: };
1db9dbe390 2024-11-28 256: reply.push("```".into());
1db9dbe390 2024-11-28 257: reply.extend(body.lines().map(|x| x.into()));
1db9dbe390 2024-11-28 258: reply.push("```".into());
1db9dbe390 2024-11-28 259:
1db9dbe390 2024-11-28 260: // and let's collect all other attachment parts
1db9dbe390 2024-11-28 261: let mut files_to_send = vec![];
1db9dbe390 2024-11-28 262: /*
1db9dbe390 2024-11-28 263: * let's just skip html parts for now, they just duplicate text?
1db9dbe390 2024-11-28 264: while html_num < html_parts {
1db9dbe390 2024-11-28 265: files_to_send.push(mail.html_part(html_num).unwrap());
1db9dbe390 2024-11-28 266: html_num += 1;
1db9dbe390 2024-11-28 267: }
1db9dbe390 2024-11-28 268: */
1db9dbe390 2024-11-28 269: while text_num < text_parts {
6887d3b7f9 2025-06-05 270: files_to_send.push(mail.text_part(text_num.try_into()?)
65b2967a92 2025-01-25 271: .ok_or(MyError::NoText)?);
1db9dbe390 2024-11-28 272: text_num += 1;
1db9dbe390 2024-11-28 273: }
1db9dbe390 2024-11-28 274: while file_num < attachments {
6887d3b7f9 2025-06-05 275: files_to_send.push(mail.attachment(file_num.try_into()?)
65b2967a92 2025-01-25 276: .ok_or(MyError::NoText)?);
1db9dbe390 2024-11-28 277: file_num += 1;
1db9dbe390 2024-11-28 278: }
1db9dbe390 2024-11-28 279:
1db9dbe390 2024-11-28 280: let msg = reply.join("\n");
1db9dbe390 2024-11-28 281: for chat in rcpt {
1db9dbe390 2024-11-28 282: if !files_to_send.is_empty() {
1db9dbe390 2024-11-28 283: let mut files = vec![];
d96b1b4710 2025-06-11 284: // let mut first_one = true;
1db9dbe390 2024-11-28 285: for chunk in &files_to_send {
d96b1b4710 2025-06-11 286: let data: Vec<u8> = chunk.contents().to_vec();
1db9dbe390 2024-11-28 287: let mut filename: Option<String> = None;
1db9dbe390 2024-11-28 288: for header in chunk.headers() {
1db9dbe390 2024-11-28 289: if header.name() == "Content-Type" {
1db9dbe390 2024-11-28 290: match header.value() {
1db9dbe390 2024-11-28 291: mail_parser::HeaderValue::ContentType(contenttype) => {
1db9dbe390 2024-11-28 292: if let Some(fname) = contenttype.attribute("name") {
1db9dbe390 2024-11-28 293: filename = Some(fname.to_owned());
1db9dbe390 2024-11-28 294: }
1db9dbe390 2024-11-28 295: },
1db9dbe390 2024-11-28 296: _ => {
65b2967a92 2025-01-25 297: self.debug("Attachment has bad ContentType header.").await?;
1db9dbe390 2024-11-28 298: },
1db9dbe390 2024-11-28 299: };
1db9dbe390 2024-11-28 300: };
1db9dbe390 2024-11-28 301: };
1db9dbe390 2024-11-28 302: let filename = if let Some(fname) = filename {
1db9dbe390 2024-11-28 303: fname
1db9dbe390 2024-11-28 304: } else {
1db9dbe390 2024-11-28 305: "Attachment.txt".into()
1db9dbe390 2024-11-28 306: };
d96b1b4710 2025-06-11 307: files.push(Attachment {
d96b1b4710 2025-06-11 308: data: Cursor::new(data),
d96b1b4710 2025-06-11 309: name: filename,
d96b1b4710 2025-06-11 310: });
d96b1b4710 2025-06-11 311: }
d96b1b4710 2025-06-11 312: self.sendgroup(chat, files, &msg).await?;
1db9dbe390 2024-11-28 313: } else {
1db9dbe390 2024-11-28 314: self.send(chat, &msg).await?;
1db9dbe390 2024-11-28 315: }
1db9dbe390 2024-11-28 316: }
1db9dbe390 2024-11-28 317: } else {
65b2967a92 2025-01-25 318: return Err(MyError::NoHeaders);
1db9dbe390 2024-11-28 319: }
1db9dbe390 2024-11-28 320: Ok(())
1db9dbe390 2024-11-28 321: }
1db9dbe390 2024-11-28 322:
1db9dbe390 2024-11-28 323: /// Send media to specified user
d96b1b4710 2025-06-11 324: pub async fn sendgroup (&self, to: &ChatPeerId, media: Vec<Attachment>, msg: &str) -> Result<(), MyError> {
d96b1b4710 2025-06-11 325: if media.len() > 1 {
d96b1b4710 2025-06-11 326: let mut attach = vec![];
d96b1b4710 2025-06-11 327: let mut pos = media.len();
d96b1b4710 2025-06-11 328: for file in media {
d96b1b4710 2025-06-11 329: let mut caption = InputMediaDocument::default();
d96b1b4710 2025-06-11 330: if pos == 1 {
d96b1b4710 2025-06-11 331: caption = caption.with_caption(msg)
d96b1b4710 2025-06-11 332: .with_caption_parse_mode(MarkdownV2);
d96b1b4710 2025-06-11 333: }
d96b1b4710 2025-06-11 334: pos -= 1;
d96b1b4710 2025-06-11 335: attach.push(
d96b1b4710 2025-06-11 336: MediaGroupItem::for_document(
d96b1b4710 2025-06-11 337: InputFile::from(
d96b1b4710 2025-06-11 338: InputFileReader::from(file.data)
d96b1b4710 2025-06-11 339: .with_file_name(file.name)
d96b1b4710 2025-06-11 340: ),
d96b1b4710 2025-06-11 341: caption
d96b1b4710 2025-06-11 342: )
d96b1b4710 2025-06-11 343: );
d96b1b4710 2025-06-11 344: }
d96b1b4710 2025-06-11 345: self.tg.execute(SendMediaGroup::new(*to, MediaGroup::new(attach)?)).await?;
d96b1b4710 2025-06-11 346: } else {
d96b1b4710 2025-06-11 347: self.tg.execute(
d96b1b4710 2025-06-11 348: SendDocument::new(
d96b1b4710 2025-06-11 349: *to,
d96b1b4710 2025-06-11 350: InputFileReader::from(media[0].data.clone())
d96b1b4710 2025-06-11 351: .with_file_name(media[0].name.clone())
d96b1b4710 2025-06-11 352: ).with_caption(msg)
d96b1b4710 2025-06-11 353: .with_caption_parse_mode(MarkdownV2)
d96b1b4710 2025-06-11 354: ).await?;
d96b1b4710 2025-06-11 355: }
d96b1b4710 2025-06-11 356: Ok(())
1db9dbe390 2024-11-28 357: }
1db9dbe390 2024-11-28 358: }
1db9dbe390 2024-11-28 359:
1db9dbe390 2024-11-28 360: impl mailin_embedded::Handler for TelegramTransport {
1db9dbe390 2024-11-28 361: /// Just deny login auth
1db9dbe390 2024-11-28 362: fn auth_login (&mut self, _username: &str, _password: &str) -> Response {
1db9dbe390 2024-11-28 363: INVALID_CREDENTIALS
1db9dbe390 2024-11-28 364: }
1db9dbe390 2024-11-28 365:
1db9dbe390 2024-11-28 366: /// Just deny plain auth
1db9dbe390 2024-11-28 367: fn auth_plain (&mut self, _authorization_id: &str, _authentication_id: &str, _password: &str) -> Response {
1db9dbe390 2024-11-28 368: INVALID_CREDENTIALS
1db9dbe390 2024-11-28 369: }
1db9dbe390 2024-11-28 370:
1db9dbe390 2024-11-28 371: /// Verify whether address is deliverable
1db9dbe390 2024-11-28 372: fn rcpt (&mut self, to: &str) -> Response {
1db9dbe390 2024-11-28 373: if self.relay {
1db9dbe390 2024-11-28 374: OK
1db9dbe390 2024-11-28 375: } else {
1db9dbe390 2024-11-28 376: match self.recipients.get(to) {
1db9dbe390 2024-11-28 377: Some(_) => OK,
1db9dbe390 2024-11-28 378: None => {
1db9dbe390 2024-11-28 379: if self.relay {
1db9dbe390 2024-11-28 380: OK
1db9dbe390 2024-11-28 381: } else {
1db9dbe390 2024-11-28 382: NO_MAILBOX
1db9dbe390 2024-11-28 383: }
1db9dbe390 2024-11-28 384: }
1db9dbe390 2024-11-28 385: }
ce79786e06 2024-06-11 386: }
ce79786e06 2024-06-11 387: }
ce79786e06 2024-06-11 388:
1db9dbe390 2024-11-28 389: /// Save headers we need
1db9dbe390 2024-11-28 390: fn data_start (&mut self, _domain: &str, from: &str, _is8bit: bool, to: &[String]) -> Response {
1db9dbe390 2024-11-28 391: self.headers = Some(SomeHeaders{
1db9dbe390 2024-11-28 392: from: from.to_string(),
1db9dbe390 2024-11-28 393: to: to.to_vec(),
1db9dbe390 2024-11-28 394: });
1db9dbe390 2024-11-28 395: OK
ce79786e06 2024-06-11 396: }
ce79786e06 2024-06-11 397:
1db9dbe390 2024-11-28 398: /// Save chunk(?) of data
65b2967a92 2025-01-25 399: fn data (&mut self, buf: &[u8]) -> Result<(), Error> {
1db9dbe390 2024-11-28 400: self.data.append(buf.to_vec().as_mut());
1db9dbe390 2024-11-28 401: Ok(())
ce79786e06 2024-06-11 402: }
ce79786e06 2024-06-11 403:
1db9dbe390 2024-11-28 404: /// Attempt to send email, return temporary error if that fails
65b2967a92 2025-01-25 405: fn data_end (&mut self) -> Response {
1db9dbe390 2024-11-28 406: let mut result = OK;
1db9dbe390 2024-11-28 407: task::block_on(async {
1db9dbe390 2024-11-28 408: // relay mail
1db9dbe390 2024-11-28 409: if let Err(err) = self.relay_mail().await {
1db9dbe390 2024-11-28 410: result = INTERNAL_ERROR;
1db9dbe390 2024-11-28 411: // in case that fails - inform default recipient
c808d500e6 2025-03-09 412: if let Err(err) = self.debug(&format!("Sending emails failed:\n{err:?}")).await {
1db9dbe390 2024-11-28 413: // in case that also fails - write some logs and bail
c808d500e6 2025-03-09 414: eprintln!("{err:?}");
1db9dbe390 2024-11-28 415: };
1db9dbe390 2024-11-28 416: };
1db9dbe390 2024-11-28 417: });
1db9dbe390 2024-11-28 418: // clear - just in case
1db9dbe390 2024-11-28 419: self.data = vec![];
1db9dbe390 2024-11-28 420: self.headers = None;
1db9dbe390 2024-11-28 421: result
7620f854a7 2024-05-21 422: }
7620f854a7 2024-05-21 423: }
7620f854a7 2024-05-21 424:
7620f854a7 2024-05-21 425: #[async_std::main]
65b2967a92 2025-01-25 426: async fn main () -> Result<()> {
e66352b9cc 2025-01-21 427: let specs = OptSpecs::new()
6887d3b7f9 2025-06-05 428: .option("help", "h", OptValue::None)
6887d3b7f9 2025-06-05 429: .option("help", "help", OptValue::None)
6887d3b7f9 2025-06-05 430: .option("config", "c", OptValue::Required)
6887d3b7f9 2025-06-05 431: .option("config", "config", OptValue::Required)
e66352b9cc 2025-01-21 432: .flag(OptFlags::OptionsEverywhere);
e66352b9cc 2025-01-21 433: let mut args = std::env::args();
e66352b9cc 2025-01-21 434: args.next();
e66352b9cc 2025-01-21 435: let parsed = specs.getopt(args);
e66352b9cc 2025-01-21 436: for u in &parsed.unknown {
c808d500e6 2025-03-09 437: println!("Unknown option: {u}");
e66352b9cc 2025-01-21 438: }
e66352b9cc 2025-01-21 439: if !(parsed.unknown.is_empty()) || parsed.options_first("help").is_some() {
e66352b9cc 2025-01-21 440: println!("SMTP2TG v{}, (C) 2024 - 2025\n\n\
e66352b9cc 2025-01-21 441: \t-h|--help\tDisplay this help\n\
e66352b9cc 2025-01-21 442: \t-c|-config …\tSet configuration file location.",
e66352b9cc 2025-01-21 443: env!("CARGO_PKG_VERSION"));
e66352b9cc 2025-01-21 444: return Ok(());
e66352b9cc 2025-01-21 445: };
e66352b9cc 2025-01-21 446: let config_file = Path::new(if let Some(path) = parsed.options_value_last("config") {
e66352b9cc 2025-01-21 447: &path[..]
e66352b9cc 2025-01-21 448: } else {
e66352b9cc 2025-01-21 449: "smtp2tg.toml"
e66352b9cc 2025-01-21 450: });
e66352b9cc 2025-01-21 451: if !config_file.exists() {
c808d500e6 2025-03-09 452: eprintln!("Error: can't read configuration from {config_file:?}");
e66352b9cc 2025-01-21 453: std::process::exit(1);
e66352b9cc 2025-01-21 454: };
cfe321bd6f 2025-01-23 455: {
cfe321bd6f 2025-01-23 456: let meta = metadata(config_file).await?;
cfe321bd6f 2025-01-23 457: if (!0o100600 & meta.permissions().mode()) > 0 {
c808d500e6 2025-03-09 458: eprintln!("Error: other users can read or write config file {config_file:?}\n\
c808d500e6 2025-03-09 459: File permissions: {:o}", meta.permissions().mode());
cfe321bd6f 2025-01-23 460: std::process::exit(1);
cfe321bd6f 2025-01-23 461: }
cfe321bd6f 2025-01-23 462: }
1db9dbe390 2024-11-28 463: let settings: config::Config = config::Config::builder()
28fde40f7a 2024-12-27 464: .set_default("fields", vec!["date", "from", "subject"]).unwrap()
1db9dbe390 2024-11-28 465: .set_default("hostname", "smtp.2.tg").unwrap()
28fde40f7a 2024-12-27 466: .set_default("listen_on", "0.0.0.0:1025").unwrap()
1db9dbe390 2024-11-28 467: .set_default("unknown", "relay").unwrap()
e66352b9cc 2025-01-21 468: .add_source(config::File::from(config_file))
1db9dbe390 2024-11-28 469: .build()
c808d500e6 2025-03-09 470: .unwrap_or_else(|_| panic!("[{config_file:?}] there was an error reading config\n\
c808d500e6 2025-03-09 471: \tplease consult \"smtp2tg.toml.example\" for details"));
1db9dbe390 2024-11-28 472:
1db9dbe390 2024-11-28 473: let listen_on = settings.get_string("listen_on")?;
1db9dbe390 2024-11-28 474: let server_name = settings.get_string("hostname")?;
1db9dbe390 2024-11-28 475: let core = TelegramTransport::new(settings);
1db9dbe390 2024-11-28 476: let mut server = mailin_embedded::Server::new(core);
1db9dbe390 2024-11-28 477:
1db9dbe390 2024-11-28 478: server.with_name(server_name)
1db9dbe390 2024-11-28 479: .with_ssl(mailin_embedded::SslConfig::None).unwrap()
1db9dbe390 2024-11-28 480: .with_addr(listen_on).unwrap();
1db9dbe390 2024-11-28 481: server.serve().unwrap();
1db9dbe390 2024-11-28 482:
1db9dbe390 2024-11-28 483: Ok(())
7620f854a7 2024-05-21 484: }