f5ed284f8c 2025-06-21 1: use crate::{
f5ed284f8c 2025-06-21 2: Cursor,
0f47e23e21 2026-01-12 3: telegram::TelegramTransport,
f5ed284f8c 2025-06-21 4: utils::{
f5ed284f8c 2025-06-21 5: Attachment,
f5ed284f8c 2025-06-21 6: RE_DOMAIN,
0f47e23e21 2026-01-12 7: validate,
f5ed284f8c 2025-06-21 8: },
f5ed284f8c 2025-06-21 9: };
f5ed284f8c 2025-06-21 10:
f5ed284f8c 2025-06-21 11: use std::{
f5ed284f8c 2025-06-21 12: collections::{
f5ed284f8c 2025-06-21 13: HashMap,
f5ed284f8c 2025-06-21 14: HashSet,
f5ed284f8c 2025-06-21 15: },
f5ed284f8c 2025-06-21 16: io::Error,
072229b5bf 2026-01-01 17: sync::Arc,
f5ed284f8c 2025-06-21 18: };
f5ed284f8c 2025-06-21 19:
14ef340959 2026-01-01 20: use async_compat::Compat;
f5ed284f8c 2025-06-21 21: use mailin_embedded::{
f5ed284f8c 2025-06-21 22: Response,
f5ed284f8c 2025-06-21 23: response::{
f5ed284f8c 2025-06-21 24: INTERNAL_ERROR,
f5ed284f8c 2025-06-21 25: INVALID_CREDENTIALS,
f5ed284f8c 2025-06-21 26: NO_MAILBOX,
f5ed284f8c 2025-06-21 27: OK
f5ed284f8c 2025-06-21 28: },
f5ed284f8c 2025-06-21 29: };
f5ed284f8c 2025-06-21 30: use regex::{
f5ed284f8c 2025-06-21 31: Regex,
f5ed284f8c 2025-06-21 32: escape,
a044f68fa7 2025-08-23 33: };
a044f68fa7 2025-08-23 34: use stacked_errors::{
a044f68fa7 2025-08-23 35: Result,
a044f68fa7 2025-08-23 36: StackableErr,
a044f68fa7 2025-08-23 37: bail,
f5ed284f8c 2025-06-21 38: };
f5ed284f8c 2025-06-21 39: use tgbot::types::ChatPeerId;
f5ed284f8c 2025-06-21 40:
f5ed284f8c 2025-06-21 41: /// `SomeHeaders` object to store data through SMTP session
f5ed284f8c 2025-06-21 42: #[derive(Clone, Debug)]
f5ed284f8c 2025-06-21 43: struct SomeHeaders {
f5ed284f8c 2025-06-21 44: from: String,
f5ed284f8c 2025-06-21 45: to: Vec<String>,
f5ed284f8c 2025-06-21 46: }
f5ed284f8c 2025-06-21 47:
f5ed284f8c 2025-06-21 48: /// `MailServer` Central object with TG api and configuration
f5ed284f8c 2025-06-21 49: #[derive(Clone, Debug)]
f5ed284f8c 2025-06-21 50: pub struct MailServer {
f5ed284f8c 2025-06-21 51: data: Vec<u8>,
f5ed284f8c 2025-06-21 52: headers: Option<SomeHeaders>,
f5ed284f8c 2025-06-21 53: relay: bool,
f5ed284f8c 2025-06-21 54: tg: Arc<TelegramTransport>,
f5ed284f8c 2025-06-21 55: fields: HashSet<String>,
f5ed284f8c 2025-06-21 56: address: Regex,
f5ed284f8c 2025-06-21 57: }
f5ed284f8c 2025-06-21 58:
f5ed284f8c 2025-06-21 59: impl MailServer {
f5ed284f8c 2025-06-21 60: /// Initialize API and read configuration
f5ed284f8c 2025-06-21 61: pub fn new(settings: config::Config) -> Result<MailServer> {
f5ed284f8c 2025-06-21 62: let api_key = settings.get_string("api_key")
f5ed284f8c 2025-06-21 63: .context("[smtp2tg.toml] missing \"api_key\" parameter.\n")?;
f5ed284f8c 2025-06-21 64: let mut recipients = HashMap::new();
f5ed284f8c 2025-06-21 65: for (name, value) in settings.get_table("recipients")
f5ed284f8c 2025-06-21 66: .expect("[smtp2tg.toml] missing table \"recipients\".\n")
f5ed284f8c 2025-06-21 67: {
f5ed284f8c 2025-06-21 68: let value = value.into_int()
f5ed284f8c 2025-06-21 69: .context("[smtp2tg.toml] \"recipient\" table values should be integers.\n")?;
f5ed284f8c 2025-06-21 70: recipients.insert(name, value);
f5ed284f8c 2025-06-21 71: }
f5ed284f8c 2025-06-21 72:
14ef340959 2026-01-01 73: let tg = Arc::new(TelegramTransport::new(api_key, recipients, &settings)?);
f5ed284f8c 2025-06-21 74: let fields = HashSet::<String>::from_iter(settings.get_array("fields")
f5ed284f8c 2025-06-21 75: .expect("[smtp2tg.toml] \"fields\" should be an array")
f5ed284f8c 2025-06-21 76: .iter().map(|x| x.clone().into_string().expect("should be strings")));
f5ed284f8c 2025-06-21 77: let mut domains: HashSet<String> = HashSet::new();
a044f68fa7 2025-08-23 78: let extra_domains = settings.get_array("domains").stack()?;
f5ed284f8c 2025-06-21 79: for domain in extra_domains {
f5ed284f8c 2025-06-21 80: let domain = domain.to_string().to_lowercase();
f5ed284f8c 2025-06-21 81: if RE_DOMAIN.is_match(&domain) {
f5ed284f8c 2025-06-21 82: domains.insert(domain);
f5ed284f8c 2025-06-21 83: } else {
f5ed284f8c 2025-06-21 84: panic!("[smtp2tg.toml] can't check of domains in \"domains\": {domain}");
f5ed284f8c 2025-06-21 85: }
f5ed284f8c 2025-06-21 86: }
f5ed284f8c 2025-06-21 87: let domains = domains.into_iter().map(|s| escape(&s))
f5ed284f8c 2025-06-21 88: .collect::<Vec<String>>().join("|");
f748e99b70 2026-08-01 89: let address = Regex::new(&format!("^[a-z0-9][-a-z0-9]*(@({domains}))?$")).stack()?;
f5ed284f8c 2025-06-21 90: let relay = match settings.get_string("unknown")
f5ed284f8c 2025-06-21 91: .context("[smtp2tg.toml] can't get \"unknown\" policy.\n")?.as_str()
f5ed284f8c 2025-06-21 92: {
f5ed284f8c 2025-06-21 93: "relay" => true,
f5ed284f8c 2025-06-21 94: "deny" => false,
f5ed284f8c 2025-06-21 95: _ => {
f5ed284f8c 2025-06-21 96: bail!("[smtp2tg.toml] \"unknown\" should be either \"relay\" or \"deny\".\n");
f5ed284f8c 2025-06-21 97: },
f5ed284f8c 2025-06-21 98: };
f5ed284f8c 2025-06-21 99:
f5ed284f8c 2025-06-21 100: Ok(MailServer {
f5ed284f8c 2025-06-21 101: data: vec!(),
f5ed284f8c 2025-06-21 102: headers: None,
f5ed284f8c 2025-06-21 103: relay,
f5ed284f8c 2025-06-21 104: tg,
f5ed284f8c 2025-06-21 105: fields,
f5ed284f8c 2025-06-21 106: address,
f5ed284f8c 2025-06-21 107: })
f5ed284f8c 2025-06-21 108: }
f5ed284f8c 2025-06-21 109:
f5ed284f8c 2025-06-21 110: /// Returns id for provided email address
f748e99b70 2026-08-01 111: pub fn get_id (&self, name: &str) -> Result<&ChatPeerId> {
f748e99b70 2026-08-01 112: if self.address.is_match(name) {
f748e99b70 2026-08-01 113: match self.tg.get(name) {
f748e99b70 2026-08-01 114: Ok(addr) => Ok(addr),
f748e99b70 2026-08-01 115: Err(_) => Ok(&self.tg.default),
f748e99b70 2026-08-01 116: }
f748e99b70 2026-08-01 117: } else {
f748e99b70 2026-08-01 118: bail!("Doesn't look like address from one of our domains.");
f5ed284f8c 2025-06-21 119: }
f5ed284f8c 2025-06-21 120: }
f5ed284f8c 2025-06-21 121:
f5ed284f8c 2025-06-21 122: /// Attempt to deliver one message
f5ed284f8c 2025-06-21 123: async fn relay_mail (&self) -> Result<()> {
f5ed284f8c 2025-06-21 124: if let Some(headers) = &self.headers {
f5ed284f8c 2025-06-21 125: let mail = mail_parser::MessageParser::new().parse(&self.data)
f5ed284f8c 2025-06-21 126: .context("Failed to parse mail.")?;
f5ed284f8c 2025-06-21 127:
f5ed284f8c 2025-06-21 128: // Adding all known addresses to recipient list, for anyone else adding default
f5ed284f8c 2025-06-21 129: // Also if list is empty also adding default
f5ed284f8c 2025-06-21 130: let mut rcpt: HashSet<&ChatPeerId> = HashSet::new();
f5ed284f8c 2025-06-21 131: if headers.to.is_empty() && !self.relay {
f5ed284f8c 2025-06-21 132: bail!("Relaying is disabled, and there's no destination address");
f5ed284f8c 2025-06-21 133: }
f5ed284f8c 2025-06-21 134: for item in &headers.to {
f5ed284f8c 2025-06-21 135: rcpt.insert(self.get_id(item)?);
f5ed284f8c 2025-06-21 136: };
f5ed284f8c 2025-06-21 137: if rcpt.is_empty() {
f5ed284f8c 2025-06-21 138: self.tg.debug("No recipient or envelope address.").await?;
f5ed284f8c 2025-06-21 139: rcpt.insert(&self.tg.default);
f5ed284f8c 2025-06-21 140: };
f5ed284f8c 2025-06-21 141:
0f47e23e21 2026-01-12 142: // preparing message header
0f47e23e21 2026-01-12 143: let mut reply: Vec<String> = vec!["<blockquote expandable>".into()];
14ef340959 2026-01-01 144: if self.fields.contains("subject") {
14ef340959 2026-01-01 145: if let Some(subject) = mail.subject() {
0f47e23e21 2026-01-12 146: reply.push(format!("<u><i>Subject:</i></u> <code>{}</code>", validate(subject).stack()?));
14ef340959 2026-01-01 147: } else if let Some(thread) = mail.thread_name() {
0f47e23e21 2026-01-12 148: reply.push(format!("<u><i>Thread:</i></u> <code>{}</code>", validate(thread).stack()?));
14ef340959 2026-01-01 149: }
14ef340959 2026-01-01 150: }
14ef340959 2026-01-01 151: // do we need to replace spaces here?
14ef340959 2026-01-01 152: if self.fields.contains("from") {
0f47e23e21 2026-01-12 153: reply.push(format!("<u><i>From:</i></u> <code>{}</code>", validate(&headers.from).stack()?));
0f47e23e21 2026-01-12 154: }
0f47e23e21 2026-01-12 155: if self.fields.contains("date")
0f47e23e21 2026-01-12 156: && let Some(date) = mail.date()
0f47e23e21 2026-01-12 157: {
0f47e23e21 2026-01-12 158: reply.push(format!("<u><i>Date:</i></u> <code>{date}</code>"));
0f47e23e21 2026-01-12 159: }
0f47e23e21 2026-01-12 160: reply.push("</blockquote><pre>".into());
c996f5c871 2026-01-12 161: let reply = reply.join("\n");
f5ed284f8c 2025-06-21 162:
f5ed284f8c 2025-06-21 163: let html_parts = mail.html_body_count();
f5ed284f8c 2025-06-21 164: let text_parts = mail.text_body_count();
f5ed284f8c 2025-06-21 165: let attachments = mail.attachment_count();
f5ed284f8c 2025-06-21 166: if html_parts != text_parts {
f5ed284f8c 2025-06-21 167: self.tg.debug(&format!("Hm, we have {html_parts} HTML parts and {text_parts} text parts.")).await?;
f5ed284f8c 2025-06-21 168: }
f5ed284f8c 2025-06-21 169: //let mut html_num = 0;
f5ed284f8c 2025-06-21 170: let mut text_num = 0;
f5ed284f8c 2025-06-21 171: let mut file_num = 0;
f5ed284f8c 2025-06-21 172: // let's display first html or text part as body
c996f5c871 2026-01-12 173: let mut body: String = "".into();
f5ed284f8c 2025-06-21 174: /*
f5ed284f8c 2025-06-21 175: * actually I don't wanna parse that html stuff
f5ed284f8c 2025-06-21 176: if html_parts > 0 {
a044f68fa7 2025-08-23 177: let text = mail.body_html(0).stack()?;
f5ed284f8c 2025-06-21 178: if text.len() < 4096 - header_size {
f5ed284f8c 2025-06-21 179: body = text;
f5ed284f8c 2025-06-21 180: html_num = 1;
f5ed284f8c 2025-06-21 181: }
f5ed284f8c 2025-06-21 182: };
f5ed284f8c 2025-06-21 183: */
f5ed284f8c 2025-06-21 184: if body.is_empty() && text_parts > 0 {
f5ed284f8c 2025-06-21 185: let text = mail.body_text(0)
c996f5c871 2026-01-12 186: .context("Failed to extract text from message")?
c996f5c871 2026-01-12 187: .replace("\r\n", "\n");
db04f7359b 2026-01-18 188: let text = validate(&text).stack()?;
c996f5c871 2026-01-12 189: // 6:
c996f5c871 2026-01-12 190: // - (headers)
0f47e23e21 2026-01-12 191: // - (mail text)
0f47e23e21 2026-01-12 192: // - 6: </pre>
6ce625a569 2026-01-12 193: if text.len() < 4096 - ( reply.len() + 6 ) {
db04f7359b 2026-01-18 194: body = text.to_string();
f5ed284f8c 2025-06-21 195: text_num = 1;
f5ed284f8c 2025-06-21 196: }
f5ed284f8c 2025-06-21 197: };
db04f7359b 2026-01-18 198: let msg = format!("{}{}</pre>", reply, body);
f5ed284f8c 2025-06-21 199:
f5ed284f8c 2025-06-21 200: // and let's collect all other attachment parts
f5ed284f8c 2025-06-21 201: let mut files_to_send = vec![];
f5ed284f8c 2025-06-21 202: /*
f5ed284f8c 2025-06-21 203: * let's just skip html parts for now, they just duplicate text?
f5ed284f8c 2025-06-21 204: while html_num < html_parts {
a044f68fa7 2025-08-23 205: files_to_send.push(mail.html_part(html_num).stack()?);
f5ed284f8c 2025-06-21 206: html_num += 1;
f5ed284f8c 2025-06-21 207: }
f5ed284f8c 2025-06-21 208: */
f5ed284f8c 2025-06-21 209: while text_num < text_parts {
a044f68fa7 2025-08-23 210: files_to_send.push(mail.text_part(text_num.try_into().stack()?)
f5ed284f8c 2025-06-21 211: .context("Failed to get text part from message.")?);
f5ed284f8c 2025-06-21 212: text_num += 1;
f5ed284f8c 2025-06-21 213: }
f5ed284f8c 2025-06-21 214: while file_num < attachments {
a044f68fa7 2025-08-23 215: files_to_send.push(mail.attachment(file_num.try_into().stack()?)
f5ed284f8c 2025-06-21 216: .context("Failed to get file part from message.")?);
f5ed284f8c 2025-06-21 217: file_num += 1;
f5ed284f8c 2025-06-21 218: }
f5ed284f8c 2025-06-21 219:
f5ed284f8c 2025-06-21 220: for chat in rcpt {
f5ed284f8c 2025-06-21 221: if !files_to_send.is_empty() {
f5ed284f8c 2025-06-21 222: let mut files = vec![];
f5ed284f8c 2025-06-21 223: // let mut first_one = true;
f5ed284f8c 2025-06-21 224: for chunk in &files_to_send {
f5ed284f8c 2025-06-21 225: let data: Vec<u8> = chunk.contents().to_vec();
f5ed284f8c 2025-06-21 226: let mut filename: Option<String> = None;
f5ed284f8c 2025-06-21 227: for header in chunk.headers() {
f5ed284f8c 2025-06-21 228: if header.name() == "Content-Type" {
f5ed284f8c 2025-06-21 229: match header.value() {
f5ed284f8c 2025-06-21 230: mail_parser::HeaderValue::ContentType(contenttype) => {
f5ed284f8c 2025-06-21 231: if let Some(fname) = contenttype.attribute("name") {
f5ed284f8c 2025-06-21 232: filename = Some(fname.to_owned());
f5ed284f8c 2025-06-21 233: }
f5ed284f8c 2025-06-21 234: },
f5ed284f8c 2025-06-21 235: _ => {
f5ed284f8c 2025-06-21 236: self.tg.debug("Attachment has bad ContentType header.").await?;
f5ed284f8c 2025-06-21 237: },
f5ed284f8c 2025-06-21 238: };
f5ed284f8c 2025-06-21 239: };
f5ed284f8c 2025-06-21 240: };
f5ed284f8c 2025-06-21 241: let filename = if let Some(fname) = filename {
f5ed284f8c 2025-06-21 242: fname
f5ed284f8c 2025-06-21 243: } else {
f5ed284f8c 2025-06-21 244: "Attachment.txt".into()
f5ed284f8c 2025-06-21 245: };
f5ed284f8c 2025-06-21 246: files.push(Attachment {
f5ed284f8c 2025-06-21 247: data: Cursor::new(data),
f5ed284f8c 2025-06-21 248: name: filename,
f5ed284f8c 2025-06-21 249: });
f5ed284f8c 2025-06-21 250: }
f5ed284f8c 2025-06-21 251: self.tg.sendgroup(chat, files, &msg).await?;
f5ed284f8c 2025-06-21 252: } else {
f5ed284f8c 2025-06-21 253: self.tg.send(chat, &msg).await?;
f5ed284f8c 2025-06-21 254: }
f5ed284f8c 2025-06-21 255: }
f5ed284f8c 2025-06-21 256: } else {
f5ed284f8c 2025-06-21 257: bail!("Required headers were not found.");
f5ed284f8c 2025-06-21 258: }
f5ed284f8c 2025-06-21 259: Ok(())
f5ed284f8c 2025-06-21 260: }
f5ed284f8c 2025-06-21 261: }
f5ed284f8c 2025-06-21 262:
f5ed284f8c 2025-06-21 263: impl mailin_embedded::Handler for MailServer {
f5ed284f8c 2025-06-21 264: /// Just deny login auth
f5ed284f8c 2025-06-21 265: fn auth_login (&mut self, _username: &str, _password: &str) -> Response {
f5ed284f8c 2025-06-21 266: INVALID_CREDENTIALS
f5ed284f8c 2025-06-21 267: }
f5ed284f8c 2025-06-21 268:
f5ed284f8c 2025-06-21 269: /// Just deny plain auth
f5ed284f8c 2025-06-21 270: fn auth_plain (&mut self, _authorization_id: &str, _authentication_id: &str, _password: &str) -> Response {
f5ed284f8c 2025-06-21 271: INVALID_CREDENTIALS
f5ed284f8c 2025-06-21 272: }
f5ed284f8c 2025-06-21 273:
f5ed284f8c 2025-06-21 274: /// Verify whether address is deliverable
f5ed284f8c 2025-06-21 275: fn rcpt (&mut self, to: &str) -> Response {
f5ed284f8c 2025-06-21 276: if self.relay {
f5ed284f8c 2025-06-21 277: OK
f5ed284f8c 2025-06-21 278: } else {
f5ed284f8c 2025-06-21 279: match self.get_id(to) {
f5ed284f8c 2025-06-21 280: Ok(_) => OK,
f5ed284f8c 2025-06-21 281: Err(_) => {
f5ed284f8c 2025-06-21 282: if self.relay {
f5ed284f8c 2025-06-21 283: OK
f5ed284f8c 2025-06-21 284: } else {
f5ed284f8c 2025-06-21 285: NO_MAILBOX
f5ed284f8c 2025-06-21 286: }
f5ed284f8c 2025-06-21 287: }
f5ed284f8c 2025-06-21 288: }
f5ed284f8c 2025-06-21 289: }
f5ed284f8c 2025-06-21 290: }
f5ed284f8c 2025-06-21 291:
f5ed284f8c 2025-06-21 292: /// Save headers we need
f5ed284f8c 2025-06-21 293: fn data_start (&mut self, _domain: &str, from: &str, _is8bit: bool, to: &[String]) -> Response {
f5ed284f8c 2025-06-21 294: self.headers = Some(SomeHeaders{
f5ed284f8c 2025-06-21 295: from: from.to_string(),
f5ed284f8c 2025-06-21 296: to: to.to_vec(),
f5ed284f8c 2025-06-21 297: });
f5ed284f8c 2025-06-21 298: OK
f5ed284f8c 2025-06-21 299: }
f5ed284f8c 2025-06-21 300:
f5ed284f8c 2025-06-21 301: /// Save chunk(?) of data
a044f68fa7 2025-08-23 302: fn data (&mut self, buf: &[u8]) -> std::result::Result<(), Error> {
f5ed284f8c 2025-06-21 303: self.data.append(buf.to_vec().as_mut());
f5ed284f8c 2025-06-21 304: Ok(())
f5ed284f8c 2025-06-21 305: }
f5ed284f8c 2025-06-21 306:
f5ed284f8c 2025-06-21 307: /// Attempt to send email, return temporary error if that fails
f5ed284f8c 2025-06-21 308: fn data_end (&mut self) -> Response {
f5ed284f8c 2025-06-21 309: let mut result = OK;
14ef340959 2026-01-01 310: smol::block_on(Compat::new(async {
f5ed284f8c 2025-06-21 311: // relay mail
f5ed284f8c 2025-06-21 312: if let Err(err) = self.relay_mail().await {
f5ed284f8c 2025-06-21 313: result = INTERNAL_ERROR;
f5ed284f8c 2025-06-21 314: // in case that fails - inform default recipient
700254f838 2026-01-18 315: if let Err(err) = self.tg.debug(&format!("Sending emails failed:\n{err:}")).await {
f5ed284f8c 2025-06-21 316: // in case that also fails - write some logs and bail
f5ed284f8c 2025-06-21 317: eprintln!("{err:?}");
f5ed284f8c 2025-06-21 318: };
f5ed284f8c 2025-06-21 319: };
14ef340959 2026-01-01 320: }));
f5ed284f8c 2025-06-21 321: // clear - just in case
f5ed284f8c 2025-06-21 322: self.data = vec![];
f5ed284f8c 2025-06-21 323: self.headers = None;
f5ed284f8c 2025-06-21 324: result
f5ed284f8c 2025-06-21 325: }
f5ed284f8c 2025-06-21 326: }