newsletter-to-web/src/main.rs

use std::{
    collections::HashMap,
    error::Error,
    fs::OpenOptions,
    io::Write,
    net::TcpStream,
    path::{Path, PathBuf},
    };

use imap::Session;
use mail_parser::Message;
use rustls_connector::RustlsConnector;

extern crate imap;
extern crate mail_parser;
extern crate rustls_connector;

fn main() {
    let dir = Path::new("data");
    if !dir.exists() {
        std::fs::create_dir(&dir).expect("Could not create directory");
    }

    let messsages = connect("my.kiers.eu", 993, "newsletters@kie.rs", "Jjkcloudron1!")
        .expect("A list of messages");

    for (uid, message) in messsages {
        println!("Processing message {}\n", &uid);

        let parsed = Message::parse(&message).expect("A parsed messsage.");

        // let from = match parsed.get_from() {
        //     mail_parser::HeaderValue::Address(a) => Some(a),
        //     _ => None,
        // }
        // .expect("An address");

        // println!(
        //     "{} <{}>",
        //     from.name.as_ref().unwrap(),
        //     from.address.as_ref().unwrap()
        // );
        // println!(
        //     "HML: {}, Text: {}",
        //     parsed.get_html_body_count(),
        //     parsed.get_text_body_count()
        // );

        let html_body = parsed.get_html_body(0).expect("Could not read body");
        let html_bytes = html_body.as_bytes();

        println!("{}", &html_body);

        let path: PathBuf = [dir, Path::new(&format!("{}.html", uid))].iter().collect();
        let mut file = OpenOptions::new()
            .write(true)
            .create(true)
            .open(path)
            .expect("Could not open file fir writing");

        file.write_all(html_bytes)
            .expect("Could not write to file.");
    }
}

fn connect(
    server: &str,
    port: u16,
    username: &str,
    password: &str,
) -> Result<HashMap<u32, Vec<u8>>, Box<dyn Error>> {
    let mut session = open_session(server, port, username, password)?;

    session.examine("INBOX")?;

    let items = match session.uid_search("ALL") {
        Ok(i) => i,
        Err(e) => return Err(Box::new(e)),
    };

    let mut msgs = HashMap::with_capacity(items.len());

    //println!("# of messages: {}", &items.len());

    for item in items {
        let msg = session.uid_fetch(&item.to_string(), "(BODY.PEEK[] UID)")?;

        let message = if let Some(m) = msg.iter().next() {
            m
        } else {
            continue;
        };

        let body = message.body().expect("Message did not have a body.");

        msgs.insert(item, body.to_owned());
    }

    session.logout().expect("Could not log out");

    Ok(msgs)
}

fn open_session(
    server: &str,
    port: u16,
    username: &str,
    password: &str,
) -> Result<
    Session<
        rustls_connector::rustls::StreamOwned<
            rustls_connector::rustls::ClientConnection,
            TcpStream,
        >,
    >,
    Box<dyn Error + 'static>,
> {
    let stream = TcpStream::connect((server, port))?;
    let tls = RustlsConnector::new_with_webpki_roots_certs();
    let tls_stream = tls.connect(server, stream)?;

    let client = imap::Client::new(tls_stream);

    Ok(client.login(username, password).map_err(|e| e.0)?)
}