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use anyhow::{anyhow, Error, Result};
use boitalettres::proto::Response;
use imap_codec::types::command::CommandBody;
use imap_codec::types::core::{Atom, Tag};
use imap_codec::types::flag::Flag;
use imap_codec::types::mailbox::{ListMailbox, Mailbox as MailboxCodec};
use imap_codec::types::response::{Code, Data, Response as ImapRes, Status};
use crate::imap::command::anonymous;
use crate::imap::flow;
use crate::imap::session::InnerContext;
use crate::mail::Mailbox;
const DEFAULT_FLAGS: [Flag; 5] = [
Flag::Seen,
Flag::Answered,
Flag::Flagged,
Flag::Deleted,
Flag::Draft,
];
pub async fn dispatch<'a>(
inner: InnerContext<'a>,
user: &'a flow::User,
) -> Result<(Response, flow::Transition)> {
let ctx = StateContext {
user,
tag: &inner.req.tag,
inner,
};
match &ctx.inner.req.body {
CommandBody::Lsub {
reference,
mailbox_wildcard,
} => ctx.lsub(reference, mailbox_wildcard).await,
CommandBody::List {
reference,
mailbox_wildcard,
} => ctx.list(reference, mailbox_wildcard).await,
CommandBody::Select { mailbox } => ctx.select(mailbox).await,
_ => anonymous::dispatch(ctx.inner).await,
}
}
// --- PRIVATE ---
struct StateContext<'a> {
inner: InnerContext<'a>,
user: &'a flow::User,
tag: &'a Tag,
}
impl<'a> StateContext<'a> {
async fn lsub(
&self,
reference: &MailboxCodec,
mailbox_wildcard: &ListMailbox,
) -> Result<(Response, flow::Transition)> {
Ok((
vec![ImapRes::Status(
Status::bad(Some(self.tag.clone()), None, "Not implemented").map_err(Error::msg)?,
)],
flow::Transition::No,
))
}
async fn list(
&self,
reference: &MailboxCodec,
mailbox_wildcard: &ListMailbox,
) -> Result<(Response, flow::Transition)> {
Ok((
vec![ImapRes::Status(
Status::bad(Some(self.tag.clone()), None, "Not implemented").map_err(Error::msg)?,
)],
flow::Transition::No,
))
}
/*
* TRACE BEGIN ---
Example: C: A142 SELECT INBOX
S: * 172 EXISTS
S: * 1 RECENT
S: * OK [UNSEEN 12] Message 12 is first unseen
S: * OK [UIDVALIDITY 3857529045] UIDs valid
S: * OK [UIDNEXT 4392] Predicted next UID
S: * FLAGS (\Answered \Flagged \Deleted \Seen \Draft)
S: * OK [PERMANENTFLAGS (\Deleted \Seen \*)] Limited
S: A142 OK [READ-WRITE] SELECT completed
--- a mailbox with no unseen message -> no unseen entry
20 select "INBOX.achats"
* FLAGS (\Answered \Flagged \Deleted \Seen \Draft $Forwarded JUNK $label1)
* OK [PERMANENTFLAGS (\Answered \Flagged \Deleted \Seen \Draft $Forwarded JUNK $label1 \*)] Flags permitted.
* 88 EXISTS
* 0 RECENT
* OK [UIDVALIDITY 1347986788] UIDs valid
* OK [UIDNEXT 91] Predicted next UID
* OK [HIGHESTMODSEQ 72] Highest
20 OK [READ-WRITE] Select completed (0.001 + 0.000 secs).
* TRACE END ---
*/
async fn select(&self, mailbox: &MailboxCodec) -> Result<(Response, flow::Transition)> {
let name = String::try_from(mailbox.clone())?;
let mut mb = Mailbox::new(&self.user.creds, name.clone())?;
tracing::info!(username=%self.user.name, mailbox=%name, "mailbox.selected");
let sum = mb.summary().await?;
tracing::trace!(summary=%sum, "mailbox.summary");
let r_unseen = Status::ok(
None,
Some(Code::Unseen(
std::num::NonZeroU32::new(1).ok_or(anyhow!("Invalid message identifier"))?,
)),
"First unseen UID",
)
.map_err(Error::msg)?;
let mut res = Vec::<ImapRes>::new();
res.push(ImapRes::Data(Data::Exists(sum.exists)));
res.push(ImapRes::Data(Data::Recent(sum.recent)));
let mut flags: Vec<Flag> = sum.flags.map(|f| match f.chars().next() {
Some('\\') => None,
Some('$') if f == "$unseen" => None,
Some(_) => match Atom::try_from(f.clone()) {
Err(_) => {
tracing::error!(username=%self.user.name, mailbox=%name, 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);
res.push(ImapRes::Data(Data::Flags(flags.clone())));
let uid_validity = Status::ok(
None,
Some(Code::UidValidity(sum.validity)),
"UIDs valid"
)
.map_err(Error::msg)?;
res.push(ImapRes::Status(uid_validity));
let next_uid = Status::ok(
None,
Some(Code::UidNext(sum.next)),
"Predict next UID"
).map_err(Error::msg)?;
res.push(ImapRes::Status(next_uid));
if let Some(unseen) = sum.unseen {
let status_unseen = Status::ok(
None,
Some(Code::Unseen(unseen.clone())),
"First unseen UID",
)
.map_err(Error::msg)?;
res.push(ImapRes::Status(status_unseen));
}
flags.push(Flag::Permanent);
let permanent_flags = Status::ok(
None,
Some(Code::PermanentFlags(flags)),
"Flags permitted",
).map_err(Error::msg)?;
res.push(ImapRes::Status(permanent_flags));
let last = Status::ok(
Some(self.tag.clone()),
Some(Code::ReadWrite),
"Select completed",
).map_err(Error::msg)?;
res.push(ImapRes::Status(last));
let tr = flow::Transition::Select(mb);
Ok((res, tr))
}
}
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