74 lines
2 KiB
Rust
74 lines
2 KiB
Rust
use std::error::Error as StdError;
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use std::fmt;
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use std::sync::Arc;
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use tokio::sync::Notify;
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use imap_codec::imap_types::core::Tag;
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use crate::imap::mailbox_view::MailboxView;
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use crate::mail::user::User;
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#[derive(Debug)]
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pub enum Error {
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ForbiddenTransition,
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}
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impl fmt::Display for Error {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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write!(f, "Forbidden Transition")
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}
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}
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impl StdError for Error {}
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pub enum State {
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NotAuthenticated,
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Authenticated(Arc<User>),
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Selected(Arc<User>, MailboxView, MailboxPerm),
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Idle(Arc<User>, MailboxView, MailboxPerm, Tag<'static>, Arc<Notify>),
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Logout,
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}
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#[derive(Clone)]
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pub enum MailboxPerm {
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ReadOnly,
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ReadWrite,
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}
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pub enum Transition {
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None,
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Authenticate(Arc<User>),
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Select(MailboxView, MailboxPerm),
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Idle(Tag<'static>, Notify),
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UnIdle,
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Unselect,
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Logout,
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}
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// See RFC3501 section 3.
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// https://datatracker.ietf.org/doc/html/rfc3501#page-13
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impl State {
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pub fn apply(&mut self, tr: Transition) -> Result<(), Error> {
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let new_state = match (std::mem::replace(self, State::NotAuthenticated), tr) {
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(_s, Transition::None) => return Ok(()),
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(State::NotAuthenticated, Transition::Authenticate(u)) => State::Authenticated(u),
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(
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State::Authenticated(u) | State::Selected(u, _, _),
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Transition::Select(m, p),
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) => State::Selected(u, m, p),
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(State::Selected(u, _, _) , Transition::Unselect) => {
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State::Authenticated(u.clone())
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}
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(State::Selected(u, m, p), Transition::Idle(t, s)) => {
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State::Idle(u, m, p, t, Arc::new(s))
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},
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(State::Idle(u, m, p, _, _), Transition::UnIdle) => {
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State::Selected(u, m, p)
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},
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(_, Transition::Logout) => State::Logout,
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_ => return Err(Error::ForbiddenTransition),
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};
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*self = new_state;
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Ok(())
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}
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}
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