134 lines
4.5 KiB
Rust
134 lines
4.5 KiB
Rust
use std::num::NonZeroU32;
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use anyhow::{anyhow, bail, Result};
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use imap_codec::imap_types::sequence::{self, Sequence, SequenceSet, SeqOrUid};
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use crate::mail::uidindex::{ImapUid, UidIndex};
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use crate::mail::unique_ident::UniqueIdent;
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pub struct Index<'a>(pub &'a UidIndex);
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impl<'a> Index<'a> {
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pub fn fetch(
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self: &Index<'a>,
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sequence_set: &SequenceSet,
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by_uid: bool,
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) -> Result<Vec<MailIndex<'a>>> {
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let mail_vec = self
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.0
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.idx_by_uid
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.iter()
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.map(|(uid, uuid)| (*uid, *uuid))
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.collect::<Vec<_>>();
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let mut mails = vec![];
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if by_uid {
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if mail_vec.is_empty() {
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return Ok(vec![]);
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}
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let iter_strat = sequence::Strategy::Naive {
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largest: mail_vec.last().unwrap().0,
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};
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let mut i = 0;
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for uid in sequence_set.iter(iter_strat) {
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while mail_vec.get(i).map(|mail| mail.0 < uid).unwrap_or(false) {
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i += 1;
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}
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if let Some(mail) = mail_vec.get(i) {
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if mail.0 == uid {
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mails.push(MailIndex {
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i: NonZeroU32::try_from(i as u32 + 1).unwrap(),
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uid: mail.0,
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uuid: mail.1,
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flags: self
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.0
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.table
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.get(&mail.1)
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.ok_or(anyhow!("mail is missing from index"))?
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.1
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.as_ref(),
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});
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}
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} else {
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break;
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}
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}
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} else {
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if mail_vec.is_empty() {
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bail!("No such message (mailbox is empty)");
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}
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let iter_strat = sequence::Strategy::Naive {
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largest: NonZeroU32::try_from((mail_vec.len()) as u32).unwrap(),
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};
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for i in sequence_set.iter(iter_strat) {
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if let Some(mail) = mail_vec.get(i.get() as usize - 1) {
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mails.push(MailIndex {
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i,
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uid: mail.0,
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uuid: mail.1,
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flags: self
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.0
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.table
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.get(&mail.1)
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.ok_or(anyhow!("mail is missing from index"))?
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.1
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.as_ref(),
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});
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} else {
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bail!("No such mail: {}", i);
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}
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}
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}
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Ok(mails)
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}
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}
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#[derive(Clone)]
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pub struct MailIndex<'a> {
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pub i: NonZeroU32,
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pub uid: ImapUid,
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pub uuid: UniqueIdent,
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pub flags: &'a Vec<String>,
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}
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impl<'a> MailIndex<'a> {
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// The following functions are used to implement the SEARCH command
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pub fn is_in_sequence_i(&self, seq: &Sequence) -> bool {
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match seq {
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Sequence::Single(SeqOrUid::Asterisk) => true,
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Sequence::Single(SeqOrUid::Value(target)) => target == &self.i,
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Sequence::Range(SeqOrUid::Asterisk, SeqOrUid::Value(x))
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| Sequence::Range(SeqOrUid::Value(x), SeqOrUid::Asterisk) => x <= &self.i,
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Sequence::Range(SeqOrUid::Value(x1), SeqOrUid::Value(x2)) => if x1 < x2 {
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x1 <= &self.i && &self.i <= x2
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} else {
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x1 >= &self.i && &self.i >= x2
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},
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Sequence::Range(SeqOrUid::Asterisk, SeqOrUid::Asterisk) => true,
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}
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}
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pub fn is_in_sequence_uid(&self, seq: &Sequence) -> bool {
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match seq {
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Sequence::Single(SeqOrUid::Asterisk) => true,
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Sequence::Single(SeqOrUid::Value(target)) => target == &self.uid,
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Sequence::Range(SeqOrUid::Asterisk, SeqOrUid::Value(x))
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| Sequence::Range(SeqOrUid::Value(x),SeqOrUid::Asterisk) => x <= &self.uid,
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Sequence::Range(SeqOrUid::Value(x1), SeqOrUid::Value(x2)) => if x1 < x2 {
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x1 <= &self.uid && &self.uid <= x2
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} else {
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x1 >= &self.uid && &self.uid >= x2
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},
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Sequence::Range(SeqOrUid::Asterisk, SeqOrUid::Asterisk) => true,
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}
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}
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pub fn is_flag_set(&self, flag: &str) -> bool {
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self.flags.iter().any(|candidate| candidate.as_str() == flag)
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}
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}
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