src/ssh.rs


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use std::time::{SystemTime, UNIX_EPOCH};

use directories::UserDirs;
use ssh2::KnownHostFileKind;

use crate::{Session, SessionSource, State};

impl SessionSource for ssh2::Session {
    type Error = ssh2::Error;

    type Iter = Vec<Session>;

    fn sessions(&self) -> Result<Self::Iter, Self::Error> {
        let timestamp = SystemTime::now()
            .duration_since(UNIX_EPOCH)
            .expect("Current time is pre-epoch. (Time traveler?)");

        let mut known_hosts = self.known_hosts()?;

        let file = UserDirs::new()
            .ok_or_else(ssh2::Error::unknown)?
            .home_dir()
            .join(".ssh/known_hosts");

        known_hosts.read_file(&file, KnownHostFileKind::OpenSSH)?;

        let sessions = known_hosts
            .hosts()?
            .into_iter()
            .filter_map(|h| match h.name() {
                Some(name) => Some(Session {
                    state: State::Discovered,
                    timestamp,
                    name: name.to_owned(),
                }),
                None => {
                    tracing::warn!("Invalid host: No plain text host name exists");
                    None
                }
            })
            .collect();

        Ok(sessions)
    }
}