mirror of
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106 lines
3.5 KiB
Rust
106 lines
3.5 KiB
Rust
//
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// Copyright (c) 2025-2026 rustmailer.com (https://rustmailer.com)
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//
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// This file is part of the Bichon Email Archiving Project
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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use crate::account::entity::Encryption;
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use crate::autoconfig::client::{IncomingServer, MailConfig};
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use crate::imap::client::Client;
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use tracing::{debug, info};
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/// A single host:port:encryption combination to probe.
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struct Guess {
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hostname: String,
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port: u16,
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encryption: Encryption,
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socket_type: &'static str,
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}
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/// Generate candidates in the same order Thunderbird uses:
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/// 1. imap.{domain} — most common
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/// 2. mail.{domain} — fallback
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/// 3. {domain} — bare domain (rare)
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fn make_guesses(domain: &str) -> Vec<Guess> {
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let hosts = [
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format!("imap.{domain}"),
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format!("mail.{domain}"),
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domain.to_string(),
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];
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let mut guesses = Vec::with_capacity(hosts.len() * 2);
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for host in &hosts {
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guesses.push(Guess {
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hostname: host.clone(),
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port: 993,
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encryption: Encryption::Ssl,
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socket_type: "SSL",
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});
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guesses.push(Guess {
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hostname: host.clone(),
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port: 143,
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encryption: Encryption::StartTls,
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socket_type: "STARTTLS",
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});
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}
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guesses
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}
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/// Try to open a connection, read the IMAP banner, and close.
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/// Returns `true` if the server responds with an IMAP greeting.
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async fn probe(hostname: &str, port: u16, encryption: &Encryption) -> bool {
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match Client::connection(hostname, encryption, port, None, true).await {
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Ok(_) => {
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debug!("GuessConfig probe succeeded: {hostname}:{port} ({encryption:?})");
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true
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}
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Err(e) => {
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debug!("GuessConfig probe failed for {hostname}:{port}: {e:?}");
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false
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}
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}
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}
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/// Thunderbird-style guessing: try common hostnames and ports, probing
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/// each with a real TCP connection.
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///
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/// Returns the first working `MailConfig`, or `None` if nothing works.
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pub async fn guess_config(domain: &str) -> Option<MailConfig> {
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let guesses = make_guesses(domain);
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info!("GuessConfig: trying {} candidates for {domain}", guesses.len());
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for g in &guesses {
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if probe(&g.hostname, g.port, &g.encryption).await {
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info!(
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"GuessConfig: found working IMAP at {}:{} ({})",
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g.hostname, g.port, g.socket_type
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);
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return Some(MailConfig {
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incoming: vec![IncomingServer {
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protocol: "imap".to_string(),
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hostname: g.hostname.clone(),
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port: g.port,
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socket_type: g.socket_type.to_string(),
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username: "%EMAILADDRESS%".to_string(),
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authentication: String::new(),
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}],
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outgoing: vec![],
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});
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}
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}
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None
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}
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