52 lines
1.2 KiB
Rust
52 lines
1.2 KiB
Rust
use std::error::Error as StdError;
|
|
use std::fmt;
|
|
|
|
use crate::login::Credentials;
|
|
use crate::mail::Mailbox;
|
|
|
|
pub struct User {
|
|
pub name: String,
|
|
pub creds: Credentials,
|
|
}
|
|
|
|
#[derive(Debug)]
|
|
pub enum Error {
|
|
ForbiddenTransition,
|
|
}
|
|
impl fmt::Display for Error {
|
|
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
|
write!(f, "Forbidden Transition")
|
|
}
|
|
}
|
|
impl StdError for Error {}
|
|
|
|
pub enum State {
|
|
NotAuthenticated,
|
|
Authenticated(User),
|
|
Selected(User, Mailbox),
|
|
Logout,
|
|
}
|
|
|
|
pub enum Transition {
|
|
None,
|
|
Authenticate(User),
|
|
Select(Mailbox),
|
|
Unselect,
|
|
Logout,
|
|
}
|
|
|
|
// See RFC3501 section 3.
|
|
// https://datatracker.ietf.org/doc/html/rfc3501#page-13
|
|
impl State {
|
|
pub fn apply(self, tr: Transition) -> Result<Self, Error> {
|
|
match (self, tr) {
|
|
(s, Transition::None) => Ok(s),
|
|
(State::NotAuthenticated, Transition::Authenticate(u)) => Ok(State::Authenticated(u)),
|
|
(State::Authenticated(u), Transition::Select(m)) => Ok(State::Selected(u, m)),
|
|
(State::Selected(u, _), Transition::Unselect) => Ok(State::Authenticated(u)),
|
|
(_, Transition::Logout) => Ok(State::Logout),
|
|
_ => Err(Error::ForbiddenTransition),
|
|
}
|
|
}
|
|
}
|