Lines of
src/main.rs
from check-in 51adce1e7e
that are changed by the sequence of edits moving toward
check-in 667b874fdb:
1: use anyhow::Result;
2: use async_std::task;
3: use samotop::{
4: mail::{
5: Builder,
6: DebugService,
7: MailDir,
8: Name
9: },
10: smtp::{
11: SmtpParser,
12: Prudence,
13: },
14: };
15: use telegram_bot::{
16: Api,
17: ParseMode,
18: SendMessage,
19: UserId,
20: };
21:
22: use std::{
23: borrow::Cow,
24: collections::{
25: HashMap,
26: HashSet,
27: },
28: io::Read,
29: path::{
30: Path,
31: PathBuf
32: },
33: time::Duration,
34: vec::Vec,
35: };
36:
37: fn address_into_iter<'a>(addr: &'a mail_parser::Address<'a, >) -> impl Iterator<Item = Cow<'a, str>> {
38: addr.clone().into_list().into_iter().map(|a| a.address.unwrap())
39: }
40:
41: fn relay_mails(maildir: &Path, core: &TelegramTransport) -> Result<()> {
42: let new_dir = maildir.join("new");
43:
44: std::fs::create_dir_all(&new_dir)?;
45:
46: let files = std::fs::read_dir(new_dir)?;
47: for file in files {
48: let file = file?;
49: let mut buf = Vec::new();
50: std::fs::File::open(file.path())?.read_to_end(&mut buf)?;
51:
52: task::block_on(async move {
53: match mail_parser::MessageParser::default().parse(&buf[..]) {
54: Some(mail) => {
55: let mail = mail.clone();
56:
57: // Fetching address lists from fields we know
58: let mut to = HashSet::new();
59: if let Some(addr) = mail.to() {
60: let _ = address_into_iter(addr).map(|x| to.insert(x));
61: };
62: if let Some(addr) = mail.header("X-Samotop-To") {
63: match addr {
64: mail_parser::HeaderValue::Address(addr) => {
65: let _ = address_into_iter(addr).map(|x| to.insert(x));
66: },
67: mail_parser::HeaderValue::Text(text) => {
68: to.insert(text.clone());
69: },
70: _ => {}
71: }
72: };
73:
74: // Adding all known addresses to recipient list, for anyone else adding default
75: // Also if list is empty also adding default
76: let mut rcpt: HashSet<UserId> = HashSet::new();
77: for item in to {
78: let item = item.into_owned();
79: if core.recipients.contains_key(&item) {
80: rcpt.insert(core.recipients[&item]);
81: } else {
82: core.debug(format!("Recipient [{}] not found.", &item)).await.unwrap();
83: rcpt.insert(core.default);
84: }
85: };
86: if rcpt.is_empty() {
87: rcpt.insert(core.default);
88: core.debug("No recipient or envelope address.").await.unwrap();
89: };
90:
91: // prepating message header
92: let mut reply: Vec<Cow<str>> = vec![];
93: if let Some(subject) = mail.subject() {
51adce1e7e 2024-05-22 94: reply.push(format!("<b>Subject:</b> {}", subject).into());
95: } else if let Some(thread) = mail.thread_name() {
51adce1e7e 2024-05-22 96: reply.push(format!("<b>Thread:</b> {}", thread).into());
97: }
98: if let Some(from) = mail.from() {
51adce1e7e 2024-05-22 99: reply.push(format!("<b>From:</b> {:?}", from).into());
100: }
101: if let Some(sender) = mail.sender() {
51adce1e7e 2024-05-22 102: reply.push(format!("<b>Sender:</b> {:?}", sender).into());
103: }
104: reply.push("".into());
105: let header_size = reply.join("\n").len() + 1;
106:
107: let html_parts = mail.html_body_count();
108: let text_parts = mail.text_body_count();
109: let attachments = mail.attachment_count();
110: if html_parts != text_parts {
111: core.debug(format!("Hm, we have {} HTML parts and {} text parts.", html_parts, text_parts)).await.unwrap();
112: }
113: //let mut html_num = 0;
114: let mut text_num = 0;
115: let mut file_num = 0;
116: // let's display first html or text part as body
117: let mut body = "".into();
118: /*
119: * actually I don't wanna parse that html stuff
120: if html_parts > 0 {
121: let text = mail.body_html(0).unwrap();
122: if text.len() < 4096 - header_size {
123: body = text;
124: html_num = 1;
125: }
126: };
127: */
128: if body == "" && text_parts > 0 {
129: let text = mail.body_text(0).unwrap();
130: if text.len() < 4096 - header_size {
131: body = text;
132: text_num = 1;
133: }
134: };
135: reply.push(body);
136:
137: // and let's coillect all other attachment parts
138: let mut files_to_send = vec![];
139: /*
140: * let's just skip html parts for now, they just duplicate text?
141: while html_num < html_parts {
142: files_to_send.push(mail.html_part(html_num).unwrap());
143: html_num += 1;
144: }
145: */
146: while text_num < text_parts {
147: files_to_send.push(mail.text_part(text_num).unwrap());
148: text_num += 1;
149: }
150: while file_num < attachments {
151: files_to_send.push(mail.attachment(file_num).unwrap());
152: file_num += 1;
153: }
154:
155: for chat in rcpt {
156: core.send(chat, reply.join("\n")).await.unwrap();
157: for chunk in &files_to_send {
158: task::sleep(Duration::from_secs(5)).await;
159: let data = chunk.contents().to_vec();
160: let obj = telegram_bot::types::InputFileUpload::with_data(data, "Attachment");
161: core.sendfile(chat, obj).await.unwrap();
162: }
163: }
164: },
165: None => { core.debug("None mail.").await.unwrap(); },
166: //send_to_sendgrid(mail, sendgrid_api_key).await;
167: };
168: });
169:
170: std::fs::remove_file(file.path())?;
171: }
172: Ok(())
173: }
174:
175: fn my_prudence() -> Prudence {
176: Prudence::default().with_read_timeout(Duration::from_secs(60)).with_banner_delay(Duration::from_secs(1))
177: }
178:
179: pub struct TelegramTransport {
180: default: UserId,
181: tg: Api,
182: recipients: HashMap<String, UserId>,
183: }
184:
185: impl TelegramTransport {
186: pub fn new(settings: &config::Config) -> TelegramTransport {
187: let api_key = settings.get_string("api_key").unwrap();
188: let tg = Api::new(api_key);
189: let default_recipient = settings.get_string("default").unwrap();
190: let recipients: HashMap<String, UserId> = settings.get_table("recipients").unwrap().into_iter().map(|(a, b)| (a, UserId::new(b.into_int().unwrap()))).collect();
191: // Barf if no default
192: let default = recipients[&default_recipient];
193:
194: TelegramTransport {
195: default,
196: tg,
197: recipients,
198: }
199: }
200:
201: pub async fn debug<'b, S>(&self, msg: S) -> Result<()>
202: where S: Into<Cow<'b, str>> {
203: self.tg.send(SendMessage::new(self.default, msg)
204: .parse_mode(ParseMode::Html)).await?;
205: Ok(())
206: }
207:
208: pub async fn send<'b, S>(&self, to: UserId, msg: S) -> Result<()>
209: where S: Into<Cow<'b, str>> {
210: self.tg.send(SendMessage::new(to, msg)
211: .parse_mode(ParseMode::Html)).await?;
212: Ok(())
213: }
214:
215: pub async fn sendfile<V>(&self, to: UserId, chunk: V) -> Result<()>
216: where V: Into<telegram_bot::InputFile> {
217: self.tg.send(telegram_bot::SendDocument::new(to, chunk)).await?;
218: Ok(())
219: }
220: }
221:
222: #[async_std::main]
223: async fn main() {
224: let settings: config::Config = config::Config::builder()
225: .add_source(config::File::with_name("smtp2tg.toml"))
226: .build().unwrap();
227:
228: let core = TelegramTransport::new(&settings);
229: let maildir: PathBuf = settings.get_string("maildir").unwrap().into();
230: let listen_on = settings.get_string("listen_on").unwrap();
231: let sink = Builder + Name::new("smtp2tg") + DebugService +
232: my_prudence() + MailDir::new(maildir.clone()).unwrap();
233:
234: task::spawn(async move {
235: loop {
236: relay_mails(&maildir, &core).unwrap();
237: task::sleep(Duration::from_secs(5)).await;
238: }
239: });
240:
241: match listen_on.as_str() {
242: "socket" => {
243: let sink = sink + samotop::smtp::Lmtp.with(SmtpParser);
244: samotop::server::UnixServer::on("./smtp2tg.sock")
245: .serve(sink.build()).await.unwrap();
246: },
247: _ => {
248: let sink = sink + samotop::smtp::Esmtp.with(SmtpParser);
249: samotop::server::TcpServer::on(listen_on)
250: .serve(sink.build()).await.unwrap();
251: },
252: };
253: }