flep 0.2.0

File transfer protocol (FTP) library
Documentation 
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use {Credentials, Error};
use server::Server;
use server::client::state::{Session, session};
use server::client::{ClientState, Action};
use protocol;

/// Handle the 'USER' command.
pub fn handle(user: &protocol::USER,
              client: &mut ClientState,
              server: &mut Server)
    -> Result<Action, Error> {
    let session = client.session.expect_login()?.clone();

    if let session::Login::WaitingForUsername = session {
        let credentials = Credentials { username: user.username.to_owned(), password: None };

        // The user may authenticate with no password
        if server.authenticate_user(&credentials) {
            client.session = Session::Ready(session::Ready::new(credentials));
            Ok(Action::Reply(protocol::reply::user::logged_in()))
        } else {
            // The user needs a password to get through.
            client.session = Session::Login(session::Login::WaitingForPassword {
                username: user.username.to_owned(),
            });

            Ok(Action::Reply(protocol::reply::user::need_password()))
        }
    } else {
        Err(protocol::Error::from_kind(protocol::ErrorKind::InvalidCommandSequence(
            "the client wait until we send the welcome message to log in".to_owned(),
        )).into())
    }
}