f5ed284f8c 2025-06-21 1: use crate::{
f5ed284f8c 2025-06-21 2: Cursor,
f5ed284f8c 2025-06-21 3: telegram::{
f5ed284f8c 2025-06-21 4: encode,
f5ed284f8c 2025-06-21 5: TelegramTransport,
f5ed284f8c 2025-06-21 6: },
f5ed284f8c 2025-06-21 7: utils::{
f5ed284f8c 2025-06-21 8: Attachment,
f5ed284f8c 2025-06-21 9: RE_DOMAIN,
f5ed284f8c 2025-06-21 10: },
f5ed284f8c 2025-06-21 11: };
f5ed284f8c 2025-06-21 12:
f5ed284f8c 2025-06-21 13: use std::{
f5ed284f8c 2025-06-21 14: borrow::Cow,
f5ed284f8c 2025-06-21 15: collections::{
f5ed284f8c 2025-06-21 16: HashMap,
f5ed284f8c 2025-06-21 17: HashSet,
f5ed284f8c 2025-06-21 18: },
f5ed284f8c 2025-06-21 19: io::Error,
072229b5bf 2026-01-01 20: sync::Arc,
f5ed284f8c 2025-06-21 21: };
f5ed284f8c 2025-06-21 22:
14ef340959 2026-01-01 23: use async_compat::Compat;
f5ed284f8c 2025-06-21 24: use mailin_embedded::{
f5ed284f8c 2025-06-21 25: Response,
f5ed284f8c 2025-06-21 26: response::{
f5ed284f8c 2025-06-21 27: INTERNAL_ERROR,
f5ed284f8c 2025-06-21 28: INVALID_CREDENTIALS,
f5ed284f8c 2025-06-21 29: NO_MAILBOX,
f5ed284f8c 2025-06-21 30: OK
f5ed284f8c 2025-06-21 31: },
f5ed284f8c 2025-06-21 32: };
f5ed284f8c 2025-06-21 33: use regex::{
f5ed284f8c 2025-06-21 34: Regex,
f5ed284f8c 2025-06-21 35: escape,
a044f68fa7 2025-08-23 36: };
a044f68fa7 2025-08-23 37: use stacked_errors::{
a044f68fa7 2025-08-23 38: Result,
a044f68fa7 2025-08-23 39: StackableErr,
a044f68fa7 2025-08-23 40: bail,
f5ed284f8c 2025-06-21 41: };
f5ed284f8c 2025-06-21 42: use tgbot::types::ChatPeerId;
f5ed284f8c 2025-06-21 43:
f5ed284f8c 2025-06-21 44: /// `SomeHeaders` object to store data through SMTP session
f5ed284f8c 2025-06-21 45: #[derive(Clone, Debug)]
f5ed284f8c 2025-06-21 46: struct SomeHeaders {
f5ed284f8c 2025-06-21 47: from: String,
f5ed284f8c 2025-06-21 48: to: Vec<String>,
f5ed284f8c 2025-06-21 49: }
f5ed284f8c 2025-06-21 50:
f5ed284f8c 2025-06-21 51: /// `MailServer` Central object with TG api and configuration
f5ed284f8c 2025-06-21 52: #[derive(Clone, Debug)]
f5ed284f8c 2025-06-21 53: pub struct MailServer {
f5ed284f8c 2025-06-21 54: data: Vec<u8>,
f5ed284f8c 2025-06-21 55: headers: Option<SomeHeaders>,
f5ed284f8c 2025-06-21 56: relay: bool,
f5ed284f8c 2025-06-21 57: tg: Arc<TelegramTransport>,
f5ed284f8c 2025-06-21 58: fields: HashSet<String>,
f5ed284f8c 2025-06-21 59: address: Regex,
f5ed284f8c 2025-06-21 60: }
f5ed284f8c 2025-06-21 61:
f5ed284f8c 2025-06-21 62: impl MailServer {
f5ed284f8c 2025-06-21 63: /// Initialize API and read configuration
f5ed284f8c 2025-06-21 64: pub fn new(settings: config::Config) -> Result<MailServer> {
f5ed284f8c 2025-06-21 65: let api_key = settings.get_string("api_key")
f5ed284f8c 2025-06-21 66: .context("[smtp2tg.toml] missing \"api_key\" parameter.\n")?;
f5ed284f8c 2025-06-21 67: let mut recipients = HashMap::new();
f5ed284f8c 2025-06-21 68: for (name, value) in settings.get_table("recipients")
f5ed284f8c 2025-06-21 69: .expect("[smtp2tg.toml] missing table \"recipients\".\n")
f5ed284f8c 2025-06-21 70: {
f5ed284f8c 2025-06-21 71: let value = value.into_int()
f5ed284f8c 2025-06-21 72: .context("[smtp2tg.toml] \"recipient\" table values should be integers.\n")?;
f5ed284f8c 2025-06-21 73: recipients.insert(name, value);
f5ed284f8c 2025-06-21 74: }
f5ed284f8c 2025-06-21 75:
14ef340959 2026-01-01 76: let tg = Arc::new(TelegramTransport::new(api_key, recipients, &settings)?);
f5ed284f8c 2025-06-21 77: let fields = HashSet::<String>::from_iter(settings.get_array("fields")
f5ed284f8c 2025-06-21 78: .expect("[smtp2tg.toml] \"fields\" should be an array")
f5ed284f8c 2025-06-21 79: .iter().map(|x| x.clone().into_string().expect("should be strings")));
f5ed284f8c 2025-06-21 80: let mut domains: HashSet<String> = HashSet::new();
a044f68fa7 2025-08-23 81: let extra_domains = settings.get_array("domains").stack()?;
f5ed284f8c 2025-06-21 82: for domain in extra_domains {
f5ed284f8c 2025-06-21 83: let domain = domain.to_string().to_lowercase();
f5ed284f8c 2025-06-21 84: if RE_DOMAIN.is_match(&domain) {
f5ed284f8c 2025-06-21 85: domains.insert(domain);
f5ed284f8c 2025-06-21 86: } else {
f5ed284f8c 2025-06-21 87: panic!("[smtp2tg.toml] can't check of domains in \"domains\": {domain}");
f5ed284f8c 2025-06-21 88: }
f5ed284f8c 2025-06-21 89: }
f5ed284f8c 2025-06-21 90: let domains = domains.into_iter().map(|s| escape(&s))
f5ed284f8c 2025-06-21 91: .collect::<Vec<String>>().join("|");
a044f68fa7 2025-08-23 92: let address = Regex::new(&format!("^(?P<user>[a-z0-9][-a-z0-9])(@({domains}))$")).stack()?;
f5ed284f8c 2025-06-21 93: let relay = match settings.get_string("unknown")
f5ed284f8c 2025-06-21 94: .context("[smtp2tg.toml] can't get \"unknown\" policy.\n")?.as_str()
f5ed284f8c 2025-06-21 95: {
f5ed284f8c 2025-06-21 96: "relay" => true,
f5ed284f8c 2025-06-21 97: "deny" => false,
f5ed284f8c 2025-06-21 98: _ => {
f5ed284f8c 2025-06-21 99: bail!("[smtp2tg.toml] \"unknown\" should be either \"relay\" or \"deny\".\n");
f5ed284f8c 2025-06-21 100: },
f5ed284f8c 2025-06-21 101: };
f5ed284f8c 2025-06-21 102:
f5ed284f8c 2025-06-21 103: Ok(MailServer {
f5ed284f8c 2025-06-21 104: data: vec!(),
f5ed284f8c 2025-06-21 105: headers: None,
f5ed284f8c 2025-06-21 106: relay,
f5ed284f8c 2025-06-21 107: tg,
f5ed284f8c 2025-06-21 108: fields,
f5ed284f8c 2025-06-21 109: address,
f5ed284f8c 2025-06-21 110: })
f5ed284f8c 2025-06-21 111: }
f5ed284f8c 2025-06-21 112:
f5ed284f8c 2025-06-21 113: /// Returns id for provided email address
f5ed284f8c 2025-06-21 114: fn get_id (&self, name: &str) -> Result<&ChatPeerId> {
f5ed284f8c 2025-06-21 115: // here we need to store String locally to borrow it after
f5ed284f8c 2025-06-21 116: let mut link = name;
f5ed284f8c 2025-06-21 117: let name: String;
f5ed284f8c 2025-06-21 118: if let Some(caps) = self.address.captures(link) {
f5ed284f8c 2025-06-21 119: name = caps["name"].to_string();
f5ed284f8c 2025-06-21 120: link = &name;
f5ed284f8c 2025-06-21 121: }
f5ed284f8c 2025-06-21 122: match self.tg.get(link) {
f5ed284f8c 2025-06-21 123: Ok(addr) => Ok(addr),
f5ed284f8c 2025-06-21 124: Err(_) => Ok(&self.tg.default),
f5ed284f8c 2025-06-21 125: }
f5ed284f8c 2025-06-21 126: }
f5ed284f8c 2025-06-21 127:
f5ed284f8c 2025-06-21 128: /// Attempt to deliver one message
f5ed284f8c 2025-06-21 129: async fn relay_mail (&self) -> Result<()> {
f5ed284f8c 2025-06-21 130: if let Some(headers) = &self.headers {
f5ed284f8c 2025-06-21 131: let mail = mail_parser::MessageParser::new().parse(&self.data)
f5ed284f8c 2025-06-21 132: .context("Failed to parse mail.")?;
f5ed284f8c 2025-06-21 133:
f5ed284f8c 2025-06-21 134: // Adding all known addresses to recipient list, for anyone else adding default
f5ed284f8c 2025-06-21 135: // Also if list is empty also adding default
f5ed284f8c 2025-06-21 136: let mut rcpt: HashSet<&ChatPeerId> = HashSet::new();
f5ed284f8c 2025-06-21 137: if headers.to.is_empty() && !self.relay {
f5ed284f8c 2025-06-21 138: bail!("Relaying is disabled, and there's no destination address");
f5ed284f8c 2025-06-21 139: }
f5ed284f8c 2025-06-21 140: for item in &headers.to {
f5ed284f8c 2025-06-21 141: rcpt.insert(self.get_id(item)?);
f5ed284f8c 2025-06-21 142: };
f5ed284f8c 2025-06-21 143: if rcpt.is_empty() {
f5ed284f8c 2025-06-21 144: self.tg.debug("No recipient or envelope address.").await?;
f5ed284f8c 2025-06-21 145: rcpt.insert(&self.tg.default);
f5ed284f8c 2025-06-21 146: };
f5ed284f8c 2025-06-21 147:
f5ed284f8c 2025-06-21 148: // prepating message header
f5ed284f8c 2025-06-21 149: let mut reply: Vec<String> = vec![];
f5ed284f8c 2025-06-21 150: if self.fields.contains("subject") {
f5ed284f8c 2025-06-21 151: if let Some(subject) = mail.subject() {
f5ed284f8c 2025-06-21 152: reply.push(format!("__*Subject:*__ `{}`", encode(subject)));
f5ed284f8c 2025-06-21 153: } else if let Some(thread) = mail.thread_name() {
f5ed284f8c 2025-06-21 154: reply.push(format!("__*Thread:*__ `{}`", encode(thread)));
f5ed284f8c 2025-06-21 155: }
f5ed284f8c 2025-06-21 156: }
f5ed284f8c 2025-06-21 157: // do we need to replace spaces here?
f5ed284f8c 2025-06-21 158: if self.fields.contains("from") {
14ef340959 2026-01-01 159: reply.push(format!("__*From:*__ `{}`", encode(&headers.from)));
f5ed284f8c 2025-06-21 160: }
f5ed284f8c 2025-06-21 161: if self.fields.contains("date") {
f5ed284f8c 2025-06-21 162: if let Some(date) = mail.date() {
14ef340959 2026-01-01 163: reply.push(format!("__*Date:*__ `{date}`"));
f5ed284f8c 2025-06-21 164: }
f5ed284f8c 2025-06-21 165: }
f5ed284f8c 2025-06-21 166: let header_size = reply.join(" ").len() + 1;
f5ed284f8c 2025-06-21 167:
f5ed284f8c 2025-06-21 168: let html_parts = mail.html_body_count();
f5ed284f8c 2025-06-21 169: let text_parts = mail.text_body_count();
f5ed284f8c 2025-06-21 170: let attachments = mail.attachment_count();
f5ed284f8c 2025-06-21 171: if html_parts != text_parts {
f5ed284f8c 2025-06-21 172: self.tg.debug(&format!("Hm, we have {html_parts} HTML parts and {text_parts} text parts.")).await?;
f5ed284f8c 2025-06-21 173: }
f5ed284f8c 2025-06-21 174: //let mut html_num = 0;
f5ed284f8c 2025-06-21 175: let mut text_num = 0;
f5ed284f8c 2025-06-21 176: let mut file_num = 0;
f5ed284f8c 2025-06-21 177: // let's display first html or text part as body
f5ed284f8c 2025-06-21 178: let mut body: Cow<'_, str> = "".into();
f5ed284f8c 2025-06-21 179: /*
f5ed284f8c 2025-06-21 180: * actually I don't wanna parse that html stuff
f5ed284f8c 2025-06-21 181: if html_parts > 0 {
a044f68fa7 2025-08-23 182: let text = mail.body_html(0).stack()?;
f5ed284f8c 2025-06-21 183: if text.len() < 4096 - header_size {
f5ed284f8c 2025-06-21 184: body = text;
f5ed284f8c 2025-06-21 185: html_num = 1;
f5ed284f8c 2025-06-21 186: }
f5ed284f8c 2025-06-21 187: };
f5ed284f8c 2025-06-21 188: */
f5ed284f8c 2025-06-21 189: if body.is_empty() && text_parts > 0 {
f5ed284f8c 2025-06-21 190: let text = mail.body_text(0)
f5ed284f8c 2025-06-21 191: .context("Failed to extract text from message")?;
f5ed284f8c 2025-06-21 192: if text.len() < 4096 - header_size {
f5ed284f8c 2025-06-21 193: body = text;
f5ed284f8c 2025-06-21 194: text_num = 1;
f5ed284f8c 2025-06-21 195: }
f5ed284f8c 2025-06-21 196: };
f5ed284f8c 2025-06-21 197: reply.push("```".into());
f5ed284f8c 2025-06-21 198: reply.extend(body.lines().map(|x| x.into()));
f5ed284f8c 2025-06-21 199: reply.push("```".into());
f5ed284f8c 2025-06-21 200:
f5ed284f8c 2025-06-21 201: // and let's collect all other attachment parts
f5ed284f8c 2025-06-21 202: let mut files_to_send = vec![];
f5ed284f8c 2025-06-21 203: /*
f5ed284f8c 2025-06-21 204: * let's just skip html parts for now, they just duplicate text?
f5ed284f8c 2025-06-21 205: while html_num < html_parts {
a044f68fa7 2025-08-23 206: files_to_send.push(mail.html_part(html_num).stack()?);
f5ed284f8c 2025-06-21 207: html_num += 1;
f5ed284f8c 2025-06-21 208: }
f5ed284f8c 2025-06-21 209: */
f5ed284f8c 2025-06-21 210: while text_num < text_parts {
a044f68fa7 2025-08-23 211: files_to_send.push(mail.text_part(text_num.try_into().stack()?)
f5ed284f8c 2025-06-21 212: .context("Failed to get text part from message.")?);
f5ed284f8c 2025-06-21 213: text_num += 1;
f5ed284f8c 2025-06-21 214: }
f5ed284f8c 2025-06-21 215: while file_num < attachments {
a044f68fa7 2025-08-23 216: files_to_send.push(mail.attachment(file_num.try_into().stack()?)
f5ed284f8c 2025-06-21 217: .context("Failed to get file part from message.")?);
f5ed284f8c 2025-06-21 218: file_num += 1;
f5ed284f8c 2025-06-21 219: }
f5ed284f8c 2025-06-21 220:
f5ed284f8c 2025-06-21 221: let msg = reply.join("\n");
f5ed284f8c 2025-06-21 222: for chat in rcpt {
f5ed284f8c 2025-06-21 223: if !files_to_send.is_empty() {
f5ed284f8c 2025-06-21 224: let mut files = vec![];
f5ed284f8c 2025-06-21 225: // let mut first_one = true;
f5ed284f8c 2025-06-21 226: for chunk in &files_to_send {
f5ed284f8c 2025-06-21 227: let data: Vec<u8> = chunk.contents().to_vec();
f5ed284f8c 2025-06-21 228: let mut filename: Option<String> = None;
f5ed284f8c 2025-06-21 229: for header in chunk.headers() {
f5ed284f8c 2025-06-21 230: if header.name() == "Content-Type" {
f5ed284f8c 2025-06-21 231: match header.value() {
f5ed284f8c 2025-06-21 232: mail_parser::HeaderValue::ContentType(contenttype) => {
f5ed284f8c 2025-06-21 233: if let Some(fname) = contenttype.attribute("name") {
f5ed284f8c 2025-06-21 234: filename = Some(fname.to_owned());
f5ed284f8c 2025-06-21 235: }
f5ed284f8c 2025-06-21 236: },
f5ed284f8c 2025-06-21 237: _ => {
f5ed284f8c 2025-06-21 238: self.tg.debug("Attachment has bad ContentType header.").await?;
f5ed284f8c 2025-06-21 239: },
f5ed284f8c 2025-06-21 240: };
f5ed284f8c 2025-06-21 241: };
f5ed284f8c 2025-06-21 242: };
f5ed284f8c 2025-06-21 243: let filename = if let Some(fname) = filename {
f5ed284f8c 2025-06-21 244: fname
f5ed284f8c 2025-06-21 245: } else {
f5ed284f8c 2025-06-21 246: "Attachment.txt".into()
f5ed284f8c 2025-06-21 247: };
f5ed284f8c 2025-06-21 248: files.push(Attachment {
f5ed284f8c 2025-06-21 249: data: Cursor::new(data),
f5ed284f8c 2025-06-21 250: name: filename,
f5ed284f8c 2025-06-21 251: });
f5ed284f8c 2025-06-21 252: }
f5ed284f8c 2025-06-21 253: self.tg.sendgroup(chat, files, &msg).await?;
f5ed284f8c 2025-06-21 254: } else {
f5ed284f8c 2025-06-21 255: self.tg.send(chat, &msg).await?;
f5ed284f8c 2025-06-21 256: }
f5ed284f8c 2025-06-21 257: }
f5ed284f8c 2025-06-21 258: } else {
f5ed284f8c 2025-06-21 259: bail!("Required headers were not found.");
f5ed284f8c 2025-06-21 260: }
f5ed284f8c 2025-06-21 261: Ok(())
f5ed284f8c 2025-06-21 262: }
f5ed284f8c 2025-06-21 263: }
f5ed284f8c 2025-06-21 264:
f5ed284f8c 2025-06-21 265: impl mailin_embedded::Handler for MailServer {
f5ed284f8c 2025-06-21 266: /// Just deny login auth
f5ed284f8c 2025-06-21 267: fn auth_login (&mut self, _username: &str, _password: &str) -> Response {
f5ed284f8c 2025-06-21 268: INVALID_CREDENTIALS
f5ed284f8c 2025-06-21 269: }
f5ed284f8c 2025-06-21 270:
f5ed284f8c 2025-06-21 271: /// Just deny plain auth
f5ed284f8c 2025-06-21 272: fn auth_plain (&mut self, _authorization_id: &str, _authentication_id: &str, _password: &str) -> Response {
f5ed284f8c 2025-06-21 273: INVALID_CREDENTIALS
f5ed284f8c 2025-06-21 274: }
f5ed284f8c 2025-06-21 275:
f5ed284f8c 2025-06-21 276: /// Verify whether address is deliverable
f5ed284f8c 2025-06-21 277: fn rcpt (&mut self, to: &str) -> Response {
f5ed284f8c 2025-06-21 278: if self.relay {
f5ed284f8c 2025-06-21 279: OK
f5ed284f8c 2025-06-21 280: } else {
f5ed284f8c 2025-06-21 281: match self.get_id(to) {
f5ed284f8c 2025-06-21 282: Ok(_) => OK,
f5ed284f8c 2025-06-21 283: Err(_) => {
f5ed284f8c 2025-06-21 284: if self.relay {
f5ed284f8c 2025-06-21 285: OK
f5ed284f8c 2025-06-21 286: } else {
f5ed284f8c 2025-06-21 287: NO_MAILBOX
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: }
f5ed284f8c 2025-06-21 293:
f5ed284f8c 2025-06-21 294: /// Save headers we need
f5ed284f8c 2025-06-21 295: fn data_start (&mut self, _domain: &str, from: &str, _is8bit: bool, to: &[String]) -> Response {
f5ed284f8c 2025-06-21 296: self.headers = Some(SomeHeaders{
f5ed284f8c 2025-06-21 297: from: from.to_string(),
f5ed284f8c 2025-06-21 298: to: to.to_vec(),
f5ed284f8c 2025-06-21 299: });
f5ed284f8c 2025-06-21 300: OK
f5ed284f8c 2025-06-21 301: }
f5ed284f8c 2025-06-21 302:
f5ed284f8c 2025-06-21 303: /// Save chunk(?) of data
a044f68fa7 2025-08-23 304: fn data (&mut self, buf: &[u8]) -> std::result::Result<(), Error> {
f5ed284f8c 2025-06-21 305: self.data.append(buf.to_vec().as_mut());
f5ed284f8c 2025-06-21 306: Ok(())
f5ed284f8c 2025-06-21 307: }
f5ed284f8c 2025-06-21 308:
f5ed284f8c 2025-06-21 309: /// Attempt to send email, return temporary error if that fails
f5ed284f8c 2025-06-21 310: fn data_end (&mut self) -> Response {
f5ed284f8c 2025-06-21 311: let mut result = OK;
14ef340959 2026-01-01 312: smol::block_on(Compat::new(async {
f5ed284f8c 2025-06-21 313: // relay mail
f5ed284f8c 2025-06-21 314: if let Err(err) = self.relay_mail().await {
f5ed284f8c 2025-06-21 315: result = INTERNAL_ERROR;
f5ed284f8c 2025-06-21 316: // in case that fails - inform default recipient
f5ed284f8c 2025-06-21 317: if let Err(err) = self.tg.debug(&format!("Sending emails failed:\n{err:?}")).await {
f5ed284f8c 2025-06-21 318: // in case that also fails - write some logs and bail
f5ed284f8c 2025-06-21 319: eprintln!("{err:?}");
f5ed284f8c 2025-06-21 320: };
f5ed284f8c 2025-06-21 321: };
14ef340959 2026-01-01 322: }));
f5ed284f8c 2025-06-21 323: // clear - just in case
f5ed284f8c 2025-06-21 324: self.data = vec![];
f5ed284f8c 2025-06-21 325: self.headers = None;
f5ed284f8c 2025-06-21 326: result
f5ed284f8c 2025-06-21 327: }
f5ed284f8c 2025-06-21 328: }