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fix: allow IMAP servers not returning UIDNEXT on SELECT and STATUS

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link2xt
2023-11-26 23:02:23 +00:00
parent 85f8f910b9
commit 2ab29e5bfa
4 changed files with 28 additions and 23 deletions
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44
src/imap.rs
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@@ -572,9 +572,6 @@ impl Imap {
/// When selecting a folder for the first time, sets the uid_next to the current
/// mailbox.uid_next so that no old emails are fetched.
///
/// Makes sure that UIDNEXT is known for `selected_mailbox`
/// and errors out if UIDNEXT cannot be determined.
///
/// Returns Result<new_emails> (i.e. whether new emails arrived),
/// if in doubt, returns new_emails=true so emails are fetched.
pub(crate) async fn select_with_uidvalidity(
@@ -592,11 +589,18 @@ impl Imap {
.as_mut()
.with_context(|| format!("No mailbox selected, folder: {folder}"))?;
let old_uid_validity = get_uidvalidity(context, folder)
.await
.with_context(|| format!("failed to get old UID validity for folder {folder}"))?;
let old_uid_next = get_uid_next(context, folder)
.await
.with_context(|| format!("failed to get old UID NEXT for folder {folder}"))?;
let new_uid_validity = mailbox
.uid_validity
.with_context(|| format!("No UIDVALIDITY for folder {folder}"))?;
let new_uid_next = if let Some(uid_next) = mailbox.uid_next {
uid_next
Some(uid_next)
} else {
warn!(
context,
@@ -621,18 +625,15 @@ impl Imap {
.await
.with_context(|| format!("STATUS (UIDNEXT) error for {folder:?}"))?;
status
.uid_next
.with_context(|| format!("STATUS {folder} (UIDNEXT) did not return UIDNEXT"))?
if status.uid_next.is_none() {
// This happens with mail.163.com as of 2023-11-26.
// It does not return UIDNEXT on SELECT and returns invalid
// `* STATUS "INBOX" ()` response on explicit request for UIDNEXT.
warn!(context, "STATUS {folder} (UIDNEXT) did not return UIDNEXT.");
}
status.uid_next
};
mailbox.uid_next = Some(new_uid_next);
let old_uid_validity = get_uidvalidity(context, folder)
.await
.with_context(|| format!("failed to get old UID validity for folder {folder}"))?;
let old_uid_next = get_uid_next(context, folder)
.await
.with_context(|| format!("failed to get old UID NEXT for folder {folder}"))?;
mailbox.uid_next = new_uid_next;
if new_uid_validity == old_uid_validity {
let new_emails = if newly_selected == NewlySelected::No {
@@ -641,7 +642,7 @@ impl Imap {
// the caller tries to fetch new messages (we could of course run a SELECT command now, but trying to fetch
// new messages is only one command, just as a SELECT command)
true
} else {
} else if let Some(new_uid_next) = new_uid_next {
if new_uid_next < old_uid_next {
warn!(
context,
@@ -651,7 +652,11 @@ impl Imap {
context.schedule_resync().await?;
}
new_uid_next != old_uid_next // If UIDNEXT changed, there are new emails
} else {
// We have no UIDNEXT and if in doubt, return true.
true
};
return Ok(new_emails);
}
@@ -660,6 +665,7 @@ impl Imap {
// ============== uid_validity has changed or is being set the first time. ==============
let new_uid_next = new_uid_next.unwrap_or_default();
set_uid_next(context, folder, new_uid_next).await?;
set_uidvalidity(context, folder, new_uid_validity).await?;
@@ -876,11 +882,7 @@ impl Imap {
.as_ref()
.with_context(|| format!("Expected {folder:?} to be selected"))?
.uid_next
.with_context(|| {
format!(
"Expected UIDNEXT to be determined for {folder:?} by select_with_uidvalidity"
)
})?;
.unwrap_or_default();
let new_uid_next = max(
max(largest_uid_fetched, largest_uid_skipped.unwrap_or(0)) + 1,
mailbox_uid_next,