116 lines
3.2 KiB
Rust
116 lines
3.2 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 imap_codec::imap_types::core::Tag;
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use tokio::sync::Notify;
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use aero_collections::user::User;
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use crate::imap::mailbox_view::MailboxView;
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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(
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Arc<User>,
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MailboxView,
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MailboxPerm,
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Tag<'static>,
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Arc<Notify>,
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),
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Logout,
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}
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impl State {
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pub fn notify(&self) -> Option<Arc<Notify>> {
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match self {
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Self::Idle(_, _, _, _, anotif) => Some(anotif.clone()),
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_ => None,
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}
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}
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}
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impl fmt::Display for State {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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use State::*;
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match self {
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NotAuthenticated => write!(f, "NotAuthenticated"),
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Authenticated(..) => write!(f, "Authenticated"),
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Selected(..) => write!(f, "Selected"),
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Idle(..) => write!(f, "Idle"),
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Logout => write!(f, "Logout"),
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}
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}
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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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impl fmt::Display for Transition {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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use Transition::*;
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match self {
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None => write!(f, "None"),
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Authenticate(..) => write!(f, "Authenticated"),
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Select(..) => write!(f, "Selected"),
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Idle(..) => write!(f, "Idle"),
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UnIdle => write!(f, "UnIdle"),
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Unselect => write!(f, "Unselect"),
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Logout => write!(f, "Logout"),
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}
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}
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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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tracing::debug!(state=%self, transition=%tr, "try change state");
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let new_state = match (std::mem::replace(self, State::Logout), tr) {
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(s, Transition::None) => s,
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(State::NotAuthenticated, Transition::Authenticate(u)) => State::Authenticated(u),
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(State::Authenticated(u) | State::Selected(u, _, _), Transition::Select(m, p)) => {
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State::Selected(u, m, p)
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}
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(State::Selected(u, _, _), Transition::Unselect) => State::Authenticated(u.clone()),
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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) => State::Selected(u, m, p),
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(_, Transition::Logout) => State::Logout,
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(s, t) => {
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tracing::error!(state=%s, transition=%t, "forbidden transition");
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return Err(Error::ForbiddenTransition);
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}
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};
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*self = new_state;
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tracing::debug!(state=%self, "transition succeeded");
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Ok(())
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}
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}
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