commit 749f1c3aedf78541b38f5915a506bdd3ca5a5231
Author: FliegendeWurst <2012gdwu+github@posteo.de>
Date:   Sat Mar 27 16:54:39 2021 +0100

    Initial commit

diff --git a/.gitignore b/.gitignore
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index 0000000..fedaa2b
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diff --git a/Cargo.lock b/Cargo.lock
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+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..a64b4b8
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,13 @@
+[package]
+name = "inboxid"
+version = "0.1.0"
+authors = ["Arne Keller <arne.keller@posteo.de>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+imap = { version = "2.4.1", default-features = false }
+itertools = "0.10.0"
+maildir = "0.5.0"
+rustls-connector = "0.13.1"
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..c23d3f9
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,111 @@
+use std::{cmp, env, error::Error, fs, io, net::TcpStream, time::Duration};
+
+use itertools::Itertools;
+use maildir::Maildir;
+use rustls_connector::RustlsConnector;
+
+fn main() -> Result<(), Box<dyn Error>> {
+	let host = env::var("MAILHOST").expect("missing envvar MAILHOST");
+	let user = env::var("MAILUSER").expect("missing envvar MAILUSER");
+	let password = env::var("MAILPASSWORD").expect("missing envvar MAILPASSWORD");
+	let maildir = env::var("MAILDIR").expect("missing envvar MAILDIR");
+	let maildir = Maildir::from(maildir);
+	maildir.create_dirs()?;
+	let port = 993;
+
+	fetch_inbox_top(&host, user, password, port, "INBOX", maildir)
+}
+
+fn fetch_inbox_top(
+	host: &str,
+	user: String,
+	password: String,
+	port: u16,
+	mailbox: &str,
+	maildir: Maildir,
+) -> Result<(), Box<dyn Error>> {
+	println!("connecting..");
+	let stream = TcpStream::connect((host, port))?;
+	let tls = RustlsConnector::new_with_native_certs()?;
+	println!("initializing TLS..");
+	let tlsstream = tls.connect(host, stream)?;
+	println!("initializing client..");
+	let client = imap::Client::new(tlsstream);
+
+	// the client we have here is unauthenticated.
+	// to do anything useful with the e-mails, we need to log in
+	println!("logging in..");
+	let mut imap_session = client.login(&user, &password).map_err(|e| e.0)?;
+	let caps = imap_session.capabilities()?;
+	println!("capabilities: {}", caps.iter().map(|x| format!("{:?}", x)).join(" "));
+
+	while let Ok(x) = imap_session.unsolicited_responses.recv_timeout(Duration::from_millis(50)) {
+		println!("aah what is this: {:?}", x);
+	}
+
+	// we want to fetch the first email in the INBOX mailbox
+	let resp = imap_session.examine(mailbox)?;
+	// TODO(errors)
+	let uid_validity = resp.uid_validity.unwrap();
+	let uid_next = resp.uid_next.unwrap();
+	println!("uid: {} {}", uid_validity, uid_next);
+
+	let (prev_uid_validity, prev_uid) = maildir.get_file(".uid").map(
+		|x| {
+			let mut fields = x.splitn(2, ',');
+			// TODO(2038): check if mailservers still just return the mailbox creation time in seconds
+			let uid_validity = fields.next().map(|x| x.parse::<u32>().ok()).unwrap_or_default().unwrap_or(0);
+			let uid_last = fields.next().map(|x| x.parse::<u32>().ok()).unwrap_or_default().unwrap_or(0);
+			(uid_validity, uid_last)
+		}
+	).unwrap_or((0, 0));
+	let fetch_range;
+	if uid_validity != prev_uid_validity {
+		fetch_range = "1:*".to_owned();
+		// TODO: somehow remove invalidated messages
+		// (is the maildir standard really this annoying?)
+	} else if uid_next != prev_uid + 1 {
+		fetch_range = format!("{}:*", prev_uid + 1)
+	} else {
+		println!("no new mail.");
+		imap_session.logout()?;
+		return Ok(());
+	}
+	println!("fetching {:?}", fetch_range);
+
+	let messages = imap_session.uid_fetch(&fetch_range, "RFC822")?;
+	let mut largest_uid = prev_uid;
+	for mail in messages.iter() {
+		largest_uid = cmp::max(largest_uid, mail.uid.unwrap());
+		println!("mail {:?}", mail.uid);
+		//let headers = mail.header().expect("message did not have headers!");
+		let body = mail.body().unwrap_or_default();
+		let mut data = Vec::new();
+		//data.extend(headers);
+		//data.push(b'\n');
+		data.extend(body);
+		maildir.store_new(&data)?;
+	}
+	let uid = cmp::max(uid_next - 1, largest_uid);
+	maildir.save_file(".uid", &format!("{},{}", uid_validity, uid))?;
+
+	// be nice to the server and log out
+	imap_session.logout()?;
+
+	Ok(())
+}
+
+trait MaildirExtension {
+	fn get_file(&self, name: &str) -> Result<String, io::Error>;
+	fn save_file(&self, name: &str, content: &str) -> Result<(), io::Error>;
+}
+
+impl MaildirExtension for Maildir {
+	fn get_file(&self, name: &str) -> Result<String, io::Error> {
+		fs::read_to_string(self.path().join(name))
+	}
+
+	fn save_file(&self, name: &str, content: &str) -> Result<(), io::Error> {
+		fs::write(self.path().join(name), content)
+	}
+}