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:
f5ed284f8c 2025-06-21 23: use mailin_embedded::{
f5ed284f8c 2025-06-21 24: Response,
f5ed284f8c 2025-06-21 25: response::{
f5ed284f8c 2025-06-21 26: INTERNAL_ERROR,
f5ed284f8c 2025-06-21 27: INVALID_CREDENTIALS,
f5ed284f8c 2025-06-21 28: NO_MAILBOX,
f5ed284f8c 2025-06-21 29: OK
f5ed284f8c 2025-06-21 30: },
f5ed284f8c 2025-06-21 31: };
f5ed284f8c 2025-06-21 32: use regex::{
f5ed284f8c 2025-06-21 33: Regex,
f5ed284f8c 2025-06-21 34: escape,
a044f68fa7 2025-08-23 35: };
a044f68fa7 2025-08-23 36: use stacked_errors::{
a044f68fa7 2025-08-23 37: Result,
a044f68fa7 2025-08-23 38: StackableErr,
a044f68fa7 2025-08-23 39: bail,
f5ed284f8c 2025-06-21 40: };
f5ed284f8c 2025-06-21 41: use tgbot::types::ChatPeerId;
f5ed284f8c 2025-06-21 42:
f5ed284f8c 2025-06-21 43: /// `SomeHeaders` object to store data through SMTP session
f5ed284f8c 2025-06-21 44: #[derive(Clone, Debug)]
f5ed284f8c 2025-06-21 45: struct SomeHeaders {
f5ed284f8c 2025-06-21 46: from: String,
f5ed284f8c 2025-06-21 47: to: Vec<String>,
f5ed284f8c 2025-06-21 48: }
f5ed284f8c 2025-06-21 49:
f5ed284f8c 2025-06-21 50: /// `MailServer` Central object with TG api and configuration
f5ed284f8c 2025-06-21 51: #[derive(Clone, Debug)]
f5ed284f8c 2025-06-21 52: pub struct MailServer {
f5ed284f8c 2025-06-21 53: data: Vec<u8>,
f5ed284f8c 2025-06-21 54: headers: Option<SomeHeaders>,
f5ed284f8c 2025-06-21 55: relay: bool,
f5ed284f8c 2025-06-21 56: tg: Arc<TelegramTransport>,
f5ed284f8c 2025-06-21 57: fields: HashSet<String>,
f5ed284f8c 2025-06-21 58: address: Regex,
f5ed284f8c 2025-06-21 59: }
f5ed284f8c 2025-06-21 60:
f5ed284f8c 2025-06-21 61: impl MailServer {
f5ed284f8c 2025-06-21 62: /// Initialize API and read configuration
f5ed284f8c 2025-06-21 63: pub fn new(settings: config::Config) -> Result<MailServer> {
f5ed284f8c 2025-06-21 64: let api_key = settings.get_string("api_key")
f5ed284f8c 2025-06-21 65: .context("[smtp2tg.toml] missing \"api_key\" parameter.\n")?;
f5ed284f8c 2025-06-21 66: let mut recipients = HashMap::new();
f5ed284f8c 2025-06-21 67: for (name, value) in settings.get_table("recipients")
f5ed284f8c 2025-06-21 68: .expect("[smtp2tg.toml] missing table \"recipients\".\n")
f5ed284f8c 2025-06-21 69: {
f5ed284f8c 2025-06-21 70: let value = value.into_int()
f5ed284f8c 2025-06-21 71: .context("[smtp2tg.toml] \"recipient\" table values should be integers.\n")?;
f5ed284f8c 2025-06-21 72: recipients.insert(name, value);
f5ed284f8c 2025-06-21 73: }
f5ed284f8c 2025-06-21 74: let default = settings.get_int("default")
f5ed284f8c 2025-06-21 75: .context("[smtp2tg.toml] missing \"default\" recipient.\n")?;
f5ed284f8c 2025-06-21 76:
f5ed284f8c 2025-06-21 77: let tg = Arc::new(TelegramTransport::new(api_key, recipients, default)?);
f5ed284f8c 2025-06-21 78: let fields = HashSet::<String>::from_iter(settings.get_array("fields")
f5ed284f8c 2025-06-21 79: .expect("[smtp2tg.toml] \"fields\" should be an array")
f5ed284f8c 2025-06-21 80: .iter().map(|x| x.clone().into_string().expect("should be strings")));
f5ed284f8c 2025-06-21 81: let mut domains: HashSet<String> = HashSet::new();
a044f68fa7 2025-08-23 82: let extra_domains = settings.get_array("domains").stack()?;
f5ed284f8c 2025-06-21 83: for domain in extra_domains {
f5ed284f8c 2025-06-21 84: let domain = domain.to_string().to_lowercase();
f5ed284f8c 2025-06-21 85: if RE_DOMAIN.is_match(&domain) {
f5ed284f8c 2025-06-21 86: domains.insert(domain);
f5ed284f8c 2025-06-21 87: } else {
f5ed284f8c 2025-06-21 88: panic!("[smtp2tg.toml] can't check of domains in \"domains\": {domain}");
f5ed284f8c 2025-06-21 89: }
f5ed284f8c 2025-06-21 90: }
f5ed284f8c 2025-06-21 91: let domains = domains.into_iter().map(|s| escape(&s))
f5ed284f8c 2025-06-21 92: .collect::<Vec<String>>().join("|");
a044f68fa7 2025-08-23 93: let address = Regex::new(&format!("^(?P<user>[a-z0-9][-a-z0-9])(@({domains}))$")).stack()?;
f5ed284f8c 2025-06-21 94: let relay = match settings.get_string("unknown")
f5ed284f8c 2025-06-21 95: .context("[smtp2tg.toml] can't get \"unknown\" policy.\n")?.as_str()
f5ed284f8c 2025-06-21 96: {
f5ed284f8c 2025-06-21 97: "relay" => true,
f5ed284f8c 2025-06-21 98: "deny" => false,
f5ed284f8c 2025-06-21 99: _ => {
f5ed284f8c 2025-06-21 100: bail!("[smtp2tg.toml] \"unknown\" should be either \"relay\" or \"deny\".\n");
f5ed284f8c 2025-06-21 101: },
f5ed284f8c 2025-06-21 102: };
f5ed284f8c 2025-06-21 103:
f5ed284f8c 2025-06-21 104: Ok(MailServer {
f5ed284f8c 2025-06-21 105: data: vec!(),
f5ed284f8c 2025-06-21 106: headers: None,
f5ed284f8c 2025-06-21 107: relay,
f5ed284f8c 2025-06-21 108: tg,
f5ed284f8c 2025-06-21 109: fields,
f5ed284f8c 2025-06-21 110: address,
f5ed284f8c 2025-06-21 111: })
f5ed284f8c 2025-06-21 112: }
f5ed284f8c 2025-06-21 113:
f5ed284f8c 2025-06-21 114: /// Returns id for provided email address
f5ed284f8c 2025-06-21 115: fn get_id (&self, name: &str) -> Result<&ChatPeerId> {
f5ed284f8c 2025-06-21 116: // here we need to store String locally to borrow it after
f5ed284f8c 2025-06-21 117: let mut link = name;
f5ed284f8c 2025-06-21 118: let name: String;
f5ed284f8c 2025-06-21 119: if let Some(caps) = self.address.captures(link) {
f5ed284f8c 2025-06-21 120: name = caps["name"].to_string();
f5ed284f8c 2025-06-21 121: link = &name;
f5ed284f8c 2025-06-21 122: }
f5ed284f8c 2025-06-21 123: match self.tg.get(link) {
f5ed284f8c 2025-06-21 124: Ok(addr) => Ok(addr),
f5ed284f8c 2025-06-21 125: Err(_) => Ok(&self.tg.default),
f5ed284f8c 2025-06-21 126: }
f5ed284f8c 2025-06-21 127: }
f5ed284f8c 2025-06-21 128:
f5ed284f8c 2025-06-21 129: /// Attempt to deliver one message
f5ed284f8c 2025-06-21 130: async fn relay_mail (&self) -> Result<()> {
f5ed284f8c 2025-06-21 131: if let Some(headers) = &self.headers {
f5ed284f8c 2025-06-21 132: let mail = mail_parser::MessageParser::new().parse(&self.data)
f5ed284f8c 2025-06-21 133: .context("Failed to parse mail.")?;
f5ed284f8c 2025-06-21 134:
f5ed284f8c 2025-06-21 135: // Adding all known addresses to recipient list, for anyone else adding default
f5ed284f8c 2025-06-21 136: // Also if list is empty also adding default
f5ed284f8c 2025-06-21 137: let mut rcpt: HashSet<&ChatPeerId> = HashSet::new();
f5ed284f8c 2025-06-21 138: if headers.to.is_empty() && !self.relay {
f5ed284f8c 2025-06-21 139: bail!("Relaying is disabled, and there's no destination address");
f5ed284f8c 2025-06-21 140: }
f5ed284f8c 2025-06-21 141: for item in &headers.to {
f5ed284f8c 2025-06-21 142: rcpt.insert(self.get_id(item)?);
f5ed284f8c 2025-06-21 143: };
f5ed284f8c 2025-06-21 144: if rcpt.is_empty() {
f5ed284f8c 2025-06-21 145: self.tg.debug("No recipient or envelope address.").await?;
f5ed284f8c 2025-06-21 146: rcpt.insert(&self.tg.default);
f5ed284f8c 2025-06-21 147: };
f5ed284f8c 2025-06-21 148:
f5ed284f8c 2025-06-21 149: // prepating message header
f5ed284f8c 2025-06-21 150: let mut reply: Vec<String> = vec![];
f5ed284f8c 2025-06-21 151: if self.fields.contains("subject") {
f5ed284f8c 2025-06-21 152: if let Some(subject) = mail.subject() {
f5ed284f8c 2025-06-21 153: reply.push(format!("__*Subject:*__ `{}`", encode(subject)));
f5ed284f8c 2025-06-21 154: } else if let Some(thread) = mail.thread_name() {
f5ed284f8c 2025-06-21 155: reply.push(format!("__*Thread:*__ `{}`", encode(thread)));
f5ed284f8c 2025-06-21 156: }
f5ed284f8c 2025-06-21 157: }
f5ed284f8c 2025-06-21 158: let mut short_headers: Vec<String> = vec![];
f5ed284f8c 2025-06-21 159: // do we need to replace spaces here?
f5ed284f8c 2025-06-21 160: if self.fields.contains("from") {
f5ed284f8c 2025-06-21 161: short_headers.push(format!("__*From:*__ `{}`", encode(&headers.from)));
f5ed284f8c 2025-06-21 162: }
f5ed284f8c 2025-06-21 163: if self.fields.contains("date") {
f5ed284f8c 2025-06-21 164: if let Some(date) = mail.date() {
f5ed284f8c 2025-06-21 165: short_headers.push(format!("__*Date:*__ `{date}`"));
f5ed284f8c 2025-06-21 166: }
f5ed284f8c 2025-06-21 167: }
f5ed284f8c 2025-06-21 168: reply.push(short_headers.join(" "));
f5ed284f8c 2025-06-21 169: let header_size = reply.join(" ").len() + 1;
f5ed284f8c 2025-06-21 170:
f5ed284f8c 2025-06-21 171: let html_parts = mail.html_body_count();
f5ed284f8c 2025-06-21 172: let text_parts = mail.text_body_count();
f5ed284f8c 2025-06-21 173: let attachments = mail.attachment_count();
f5ed284f8c 2025-06-21 174: if html_parts != text_parts {
f5ed284f8c 2025-06-21 175: self.tg.debug(&format!("Hm, we have {html_parts} HTML parts and {text_parts} text parts.")).await?;
f5ed284f8c 2025-06-21 176: }
f5ed284f8c 2025-06-21 177: //let mut html_num = 0;
f5ed284f8c 2025-06-21 178: let mut text_num = 0;
f5ed284f8c 2025-06-21 179: let mut file_num = 0;
f5ed284f8c 2025-06-21 180: // let's display first html or text part as body
f5ed284f8c 2025-06-21 181: let mut body: Cow<'_, str> = "".into();
f5ed284f8c 2025-06-21 182: /*
f5ed284f8c 2025-06-21 183: * actually I don't wanna parse that html stuff
f5ed284f8c 2025-06-21 184: if html_parts > 0 {
a044f68fa7 2025-08-23 185: let text = mail.body_html(0).stack()?;
f5ed284f8c 2025-06-21 186: if text.len() < 4096 - header_size {
f5ed284f8c 2025-06-21 187: body = text;
f5ed284f8c 2025-06-21 188: html_num = 1;
f5ed284f8c 2025-06-21 189: }
f5ed284f8c 2025-06-21 190: };
f5ed284f8c 2025-06-21 191: */
f5ed284f8c 2025-06-21 192: if body.is_empty() && text_parts > 0 {
f5ed284f8c 2025-06-21 193: let text = mail.body_text(0)
f5ed284f8c 2025-06-21 194: .context("Failed to extract text from message")?;
f5ed284f8c 2025-06-21 195: if text.len() < 4096 - header_size {
f5ed284f8c 2025-06-21 196: body = text;
f5ed284f8c 2025-06-21 197: text_num = 1;
f5ed284f8c 2025-06-21 198: }
f5ed284f8c 2025-06-21 199: };
f5ed284f8c 2025-06-21 200: reply.push("```".into());
f5ed284f8c 2025-06-21 201: reply.extend(body.lines().map(|x| x.into()));
f5ed284f8c 2025-06-21 202: reply.push("```".into());
f5ed284f8c 2025-06-21 203:
f5ed284f8c 2025-06-21 204: // and let's collect all other attachment parts
f5ed284f8c 2025-06-21 205: let mut files_to_send = vec![];
f5ed284f8c 2025-06-21 206: /*
f5ed284f8c 2025-06-21 207: * let's just skip html parts for now, they just duplicate text?
f5ed284f8c 2025-06-21 208: while html_num < html_parts {
a044f68fa7 2025-08-23 209: files_to_send.push(mail.html_part(html_num).stack()?);
f5ed284f8c 2025-06-21 210: html_num += 1;
f5ed284f8c 2025-06-21 211: }
f5ed284f8c 2025-06-21 212: */
f5ed284f8c 2025-06-21 213: while text_num < text_parts {
a044f68fa7 2025-08-23 214: files_to_send.push(mail.text_part(text_num.try_into().stack()?)
f5ed284f8c 2025-06-21 215: .context("Failed to get text part from message.")?);
f5ed284f8c 2025-06-21 216: text_num += 1;
f5ed284f8c 2025-06-21 217: }
f5ed284f8c 2025-06-21 218: while file_num < attachments {
a044f68fa7 2025-08-23 219: files_to_send.push(mail.attachment(file_num.try_into().stack()?)
f5ed284f8c 2025-06-21 220: .context("Failed to get file part from message.")?);
f5ed284f8c 2025-06-21 221: file_num += 1;
f5ed284f8c 2025-06-21 222: }
f5ed284f8c 2025-06-21 223:
f5ed284f8c 2025-06-21 224: let msg = reply.join("\n");
f5ed284f8c 2025-06-21 225: for chat in rcpt {
f5ed284f8c 2025-06-21 226: if !files_to_send.is_empty() {
f5ed284f8c 2025-06-21 227: let mut files = vec![];
f5ed284f8c 2025-06-21 228: // let mut first_one = true;
f5ed284f8c 2025-06-21 229: for chunk in &files_to_send {
f5ed284f8c 2025-06-21 230: let data: Vec<u8> = chunk.contents().to_vec();
f5ed284f8c 2025-06-21 231: let mut filename: Option<String> = None;
f5ed284f8c 2025-06-21 232: for header in chunk.headers() {
f5ed284f8c 2025-06-21 233: if header.name() == "Content-Type" {
f5ed284f8c 2025-06-21 234: match header.value() {
f5ed284f8c 2025-06-21 235: mail_parser::HeaderValue::ContentType(contenttype) => {
f5ed284f8c 2025-06-21 236: if let Some(fname) = contenttype.attribute("name") {
f5ed284f8c 2025-06-21 237: filename = Some(fname.to_owned());
f5ed284f8c 2025-06-21 238: }
f5ed284f8c 2025-06-21 239: },
f5ed284f8c 2025-06-21 240: _ => {
f5ed284f8c 2025-06-21 241: self.tg.debug("Attachment has bad ContentType header.").await?;
f5ed284f8c 2025-06-21 242: },
f5ed284f8c 2025-06-21 243: };
f5ed284f8c 2025-06-21 244: };
f5ed284f8c 2025-06-21 245: };
f5ed284f8c 2025-06-21 246: let filename = if let Some(fname) = filename {
f5ed284f8c 2025-06-21 247: fname
f5ed284f8c 2025-06-21 248: } else {
f5ed284f8c 2025-06-21 249: "Attachment.txt".into()
f5ed284f8c 2025-06-21 250: };
f5ed284f8c 2025-06-21 251: files.push(Attachment {
f5ed284f8c 2025-06-21 252: data: Cursor::new(data),
f5ed284f8c 2025-06-21 253: name: filename,
f5ed284f8c 2025-06-21 254: });
f5ed284f8c 2025-06-21 255: }
f5ed284f8c 2025-06-21 256: self.tg.sendgroup(chat, files, &msg).await?;
f5ed284f8c 2025-06-21 257: } else {
f5ed284f8c 2025-06-21 258: self.tg.send(chat, &msg).await?;
f5ed284f8c 2025-06-21 259: }
f5ed284f8c 2025-06-21 260: }
f5ed284f8c 2025-06-21 261: } else {
f5ed284f8c 2025-06-21 262: bail!("Required headers were not found.");
f5ed284f8c 2025-06-21 263: }
f5ed284f8c 2025-06-21 264: Ok(())
f5ed284f8c 2025-06-21 265: }
f5ed284f8c 2025-06-21 266: }
f5ed284f8c 2025-06-21 267:
f5ed284f8c 2025-06-21 268: impl mailin_embedded::Handler for MailServer {
f5ed284f8c 2025-06-21 269: /// Just deny login auth
f5ed284f8c 2025-06-21 270: fn auth_login (&mut self, _username: &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: /// Just deny plain auth
f5ed284f8c 2025-06-21 275: fn auth_plain (&mut self, _authorization_id: &str, _authentication_id: &str, _password: &str) -> Response {
f5ed284f8c 2025-06-21 276: INVALID_CREDENTIALS
f5ed284f8c 2025-06-21 277: }
f5ed284f8c 2025-06-21 278:
f5ed284f8c 2025-06-21 279: /// Verify whether address is deliverable
f5ed284f8c 2025-06-21 280: fn rcpt (&mut self, to: &str) -> Response {
f5ed284f8c 2025-06-21 281: if self.relay {
f5ed284f8c 2025-06-21 282: OK
f5ed284f8c 2025-06-21 283: } else {
f5ed284f8c 2025-06-21 284: match self.get_id(to) {
f5ed284f8c 2025-06-21 285: Ok(_) => OK,
f5ed284f8c 2025-06-21 286: Err(_) => {
f5ed284f8c 2025-06-21 287: if self.relay {
f5ed284f8c 2025-06-21 288: OK
f5ed284f8c 2025-06-21 289: } else {
f5ed284f8c 2025-06-21 290: NO_MAILBOX
f5ed284f8c 2025-06-21 291: }
f5ed284f8c 2025-06-21 292: }
f5ed284f8c 2025-06-21 293: }
f5ed284f8c 2025-06-21 294: }
f5ed284f8c 2025-06-21 295: }
f5ed284f8c 2025-06-21 296:
f5ed284f8c 2025-06-21 297: /// Save headers we need
f5ed284f8c 2025-06-21 298: fn data_start (&mut self, _domain: &str, from: &str, _is8bit: bool, to: &[String]) -> Response {
f5ed284f8c 2025-06-21 299: self.headers = Some(SomeHeaders{
f5ed284f8c 2025-06-21 300: from: from.to_string(),
f5ed284f8c 2025-06-21 301: to: to.to_vec(),
f5ed284f8c 2025-06-21 302: });
f5ed284f8c 2025-06-21 303: OK
f5ed284f8c 2025-06-21 304: }
f5ed284f8c 2025-06-21 305:
f5ed284f8c 2025-06-21 306: /// Save chunk(?) of data
a044f68fa7 2025-08-23 307: fn data (&mut self, buf: &[u8]) -> std::result::Result<(), Error> {
f5ed284f8c 2025-06-21 308: self.data.append(buf.to_vec().as_mut());
f5ed284f8c 2025-06-21 309: Ok(())
f5ed284f8c 2025-06-21 310: }
f5ed284f8c 2025-06-21 311:
f5ed284f8c 2025-06-21 312: /// Attempt to send email, return temporary error if that fails
f5ed284f8c 2025-06-21 313: fn data_end (&mut self) -> Response {
f5ed284f8c 2025-06-21 314: let mut result = OK;
072229b5bf 2026-01-01 315: smol::block_on(async {
f5ed284f8c 2025-06-21 316: // relay mail
f5ed284f8c 2025-06-21 317: if let Err(err) = self.relay_mail().await {
f5ed284f8c 2025-06-21 318: result = INTERNAL_ERROR;
f5ed284f8c 2025-06-21 319: // in case that fails - inform default recipient
f5ed284f8c 2025-06-21 320: if let Err(err) = self.tg.debug(&format!("Sending emails failed:\n{err:?}")).await {
f5ed284f8c 2025-06-21 321: // in case that also fails - write some logs and bail
f5ed284f8c 2025-06-21 322: eprintln!("{err:?}");
f5ed284f8c 2025-06-21 323: };
f5ed284f8c 2025-06-21 324: };
f5ed284f8c 2025-06-21 325: });
f5ed284f8c 2025-06-21 326: // clear - just in case
f5ed284f8c 2025-06-21 327: self.data = vec![];
f5ed284f8c 2025-06-21 328: self.headers = None;
f5ed284f8c 2025-06-21 329: result
f5ed284f8c 2025-06-21 330: }
f5ed284f8c 2025-06-21 331: }