2022-06-29 13:39:54 +00:00
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use std::sync::Arc;
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use anyhow::{Error, Result};
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2022-06-29 14:05:34 +00:00
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use boitalettres::proto::res::body::Data as Body;
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2022-06-29 13:39:54 +00:00
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use imap_codec::types::core::Atom;
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use imap_codec::types::flag::Flag;
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use imap_codec::types::response::{Code, Data, Status};
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2022-06-29 13:52:09 +00:00
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use crate::mail::mailbox::Mailbox;
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2022-06-29 13:39:54 +00:00
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use crate::mail::uidindex::UidIndex;
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const DEFAULT_FLAGS: [Flag; 5] = [
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Flag::Seen,
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Flag::Answered,
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Flag::Flagged,
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Flag::Deleted,
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Flag::Draft,
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];
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/// A MailboxView is responsible for giving the client the information
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/// it needs about a mailbox, such as an initial summary of the mailbox's
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/// content and continuous updates indicating when the content
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/// of the mailbox has been changed.
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/// To do this, it keeps a variable `known_state` that corresponds to
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/// what the client knows, and produces IMAP messages to be sent to the
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/// client that go along updates to `known_state`.
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pub struct MailboxView {
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mailbox: Arc<Mailbox>,
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known_state: UidIndex,
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}
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impl MailboxView {
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/// Creates a new IMAP view into a mailbox.
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/// Generates the necessary IMAP messages so that the client
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/// has a satisfactory summary of the current mailbox's state.
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2022-06-29 13:52:09 +00:00
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/// These are the messages that are sent in response to a SELECT command.
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2022-06-29 13:39:54 +00:00
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pub async fn new(mailbox: Arc<Mailbox>) -> Result<(Self, Vec<Body>)> {
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2022-06-29 14:04:11 +00:00
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// TODO THIS IS JUST A TEST REMOVE LATER
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mailbox.test().await?;
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2022-06-29 13:39:54 +00:00
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let state = mailbox.current_uid_index().await;
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let new_view = Self {
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mailbox,
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known_state: state,
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};
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let mut data = Vec::<Body>::new();
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data.push(new_view.exists()?);
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data.push(new_view.recent()?);
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data.extend(new_view.flags()?.into_iter());
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data.push(new_view.uidvalidity()?);
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data.push(new_view.uidnext()?);
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if let Some(unseen) = new_view.unseen()? {
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data.push(unseen);
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}
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Ok((new_view, data))
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}
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// ----
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/// Produce an OK [UIDVALIDITY _] message corresponding to `known_state`
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fn uidvalidity(&self) -> Result<Body> {
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let uid_validity = Status::ok(
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None,
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Some(Code::UidValidity(self.known_state.uidvalidity)),
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"UIDs valid",
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)
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.map_err(Error::msg)?;
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Ok(Body::Status(uid_validity))
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}
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/// Produce an OK [UIDNEXT _] message corresponding to `known_state`
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fn uidnext(&self) -> Result<Body> {
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let next_uid = Status::ok(
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None,
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Some(Code::UidNext(self.known_state.uidnext)),
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"Predict next UID",
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)
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.map_err(Error::msg)?;
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Ok(Body::Status(next_uid))
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}
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/// Produces an UNSEEN message (if relevant) corresponding to the
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/// first unseen message id in `known_state`
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fn unseen(&self) -> Result<Option<Body>> {
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let unseen = self
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.known_state
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.idx_by_flag
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.get(&"$unseen".to_string())
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.and_then(|os| os.get_min())
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.cloned();
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if let Some(unseen) = unseen {
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let status_unseen =
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Status::ok(None, Some(Code::Unseen(unseen.clone())), "First unseen UID")
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.map_err(Error::msg)?;
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Ok(Some(Body::Status(status_unseen)))
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} else {
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Ok(None)
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}
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}
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/// Produce an EXISTS message corresponding to the number of mails
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/// in `known_state`
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fn exists(&self) -> Result<Body> {
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let exists = u32::try_from(self.known_state.idx_by_uid.len())?;
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Ok(Body::Data(Data::Exists(exists)))
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}
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/// Produce a RECENT message corresponding to the number of
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/// recent mails in `known_state`
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fn recent(&self) -> Result<Body> {
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let recent = self
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.known_state
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.idx_by_flag
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.get(&"\\Recent".to_string())
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.map(|os| os.len())
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.unwrap_or(0);
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let recent = u32::try_from(recent)?;
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Ok(Body::Data(Data::Recent(recent)))
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}
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/// Produce a FLAGS and a PERMANENTFLAGS message that indicates
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/// the flags that are in `known_state` + default flags
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fn flags(&self) -> Result<Vec<Body>> {
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let mut flags: Vec<Flag> = self
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.known_state
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.idx_by_flag
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.flags()
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.map(|f| match f.chars().next() {
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Some('\\') => None,
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Some('$') if f == "$unseen" => None,
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Some(_) => match Atom::try_from(f.clone()) {
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Err(_) => {
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tracing::error!(flag=%f, "Unable to encode flag as IMAP atom");
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None
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}
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Ok(a) => Some(Flag::Keyword(a)),
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},
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None => None,
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})
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.flatten()
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.collect();
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2022-06-29 13:52:09 +00:00
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for f in DEFAULT_FLAGS.iter() {
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if !flags.contains(f) {
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flags.push(f.clone());
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}
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}
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2022-06-29 13:39:54 +00:00
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let mut ret = vec![Body::Data(Data::Flags(flags.clone()))];
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flags.push(Flag::Permanent);
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let permanent_flags =
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Status::ok(None, Some(Code::PermanentFlags(flags)), "Flags permitted")
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.map_err(Error::msg)?;
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ret.push(Body::Status(permanent_flags));
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Ok(ret)
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}
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}
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