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