fn login_to_auth(username: String, password: String) -> Result<Authentication, String> {
    // unimplemented!();
    let vu: Vec<&str> = username.split(':').collect();
    match *vu {
        [] => Err(String::from("Comprend pas")),
        [login] => Ok(Authentication::Login {
            username: login.to_string(),
            password: password.to_string(),
        }),
        [auth_type, imei, idtel] if auth_type == "ident" => Ok(Authentication::Ident {
            imei: imei.to_string(),
            idtel: idtel.to_string(),
        }),
        [auth_type, imei, idtel] if auth_type == "auth" => {
            let vt: Vec<&str> = password.split(':').collect();
            match *vt {
                [uid, token] => Ok(Authentication::Token {
                    uid: uid.to_string(),
                    token: token.to_string(),
                    imei: imei.to_string(),
                    idtel: idtel.to_string(),
                }),
                _ => Err(String::from(format!(
                    "this imei {} is trying to use a password {} that is not a token.",
                    imei, password
                ))),
            }
        }
        _ => Err(String::from("I don't understand the username chain.")),
    }
}