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use std::num::NonZeroU32;
use anyhow::{anyhow, bail, Result};
use chrono::{Offset, TimeZone, Utc};
use imap_codec::imap_types::core::{IString, NString};
use imap_codec::imap_types::datetime::DateTime;
use imap_codec::imap_types::fetch::{
MessageDataItem, MessageDataItemName, Section as FetchSection,
};
use imap_codec::imap_types::flag::Flag;
use imap_codec::imap_types::response::Data;
use eml_codec::{
imf,
part::{composite::Message, AnyPart},
};
use crate::imap::response::Body;
use crate::imap::mime_view;
use crate::imap::flags;
use crate::imap::attributes::AttributesProxy;
use crate::mail::mailbox::MailMeta;
use crate::imap::mailbox_view::MailIdentifiers;
use crate::imap::imf_view::message_envelope;
pub struct MailView<'a> {
pub ids: &'a MailIdentifiers,
pub meta: &'a MailMeta,
pub flags: &'a Vec<String>,
pub content: FetchedMail<'a>,
}
impl<'a> MailView<'a> {
fn uid(&self) -> MessageDataItem<'static> {
MessageDataItem::Uid(self.ids.uid.clone())
}
fn flags(&self) -> MessageDataItem<'static> {
MessageDataItem::Flags(
self.flags
.iter()
.filter_map(|f| flags::from_str(f))
.collect(),
)
}
fn rfc_822_size(&self) -> MessageDataItem<'static> {
MessageDataItem::Rfc822Size(self.meta.rfc822_size as u32)
}
fn rfc_822_header(&self) -> MessageDataItem<'static> {
MessageDataItem::Rfc822Header(NString(
self.meta
.headers
.to_vec()
.try_into()
.ok()
.map(IString::Literal),
))
}
fn rfc_822_text(&self) -> Result<MessageDataItem<'static>> {
Ok(MessageDataItem::Rfc822Text(NString(
self.content
.as_full()?
.raw_body
.to_vec()
.try_into()
.ok()
.map(IString::Literal),
)))
}
fn rfc822(&self) -> Result<MessageDataItem<'static>> {
Ok(MessageDataItem::Rfc822(NString(
self.content
.as_full()?
.raw_part
.to_vec()
.try_into()
.ok()
.map(IString::Literal),
)))
}
fn envelope(&self) -> MessageDataItem<'static> {
MessageDataItem::Envelope(message_envelope(self.content.imf().clone()))
}
fn body(&self) -> Result<MessageDataItem<'static>> {
Ok(MessageDataItem::Body(mime_view::bodystructure(
self.content.as_full()?.child.as_ref(),
)?))
}
fn body_structure(&self) -> Result<MessageDataItem<'static>> {
Ok(MessageDataItem::Body(mime_view::bodystructure(
self.content.as_full()?.child.as_ref(),
)?))
}
/// maps to BODY[<section>]<<partial>> and BODY.PEEK[<section>]<<partial>>
/// peek does not implicitly set the \Seen flag
/// eg. BODY[HEADER.FIELDS (DATE FROM)]
/// eg. BODY[]<0.2048>
fn body_ext<'b>(
&self,
section: &Option<FetchSection<'b>>,
partial: &Option<(u32, NonZeroU32)>,
peek: &bool,
) -> Result<(MessageDataItem<'b>, SeenFlag)> {
// Manage Seen flag
let mut seen = SeenFlag::DoNothing;
let seen_flag = Flag::Seen.to_string();
if !peek && !self.flags.iter().any(|x| *x == seen_flag) {
// Add \Seen flag
//self.mailbox.add_flags(uuid, &[seen_flag]).await?;
seen = SeenFlag::MustAdd;
}
// Process message
let (text, origin) = match mime_view::body_ext(self.content.as_anypart()?, section, partial)? {
mime_view::BodySection::Full(body) => (body, None),
mime_view::BodySection::Slice { body, origin_octet } => (body, Some(origin_octet)),
};
let data = NString(text.to_vec().try_into().ok().map(IString::Literal));
return Ok((
MessageDataItem::BodyExt {
section: section.as_ref().map(|fs| fs.clone()),
origin,
data,
},
seen,
));
}
fn internal_date(&self) -> Result<MessageDataItem<'static>> {
let dt = Utc
.fix()
.timestamp_opt(i64::try_from(self.meta.internaldate / 1000)?, 0)
.earliest()
.ok_or(anyhow!("Unable to parse internal date"))?;
Ok(MessageDataItem::InternalDate(DateTime::unvalidated(dt)))
}
pub fn filter<'b>(&self, ap: &AttributesProxy) -> Result<(Body<'static>, SeenFlag)> {
let mut seen = SeenFlag::DoNothing;
let res_attrs = ap
.attrs
.iter()
.map(|attr| match attr {
MessageDataItemName::Uid => Ok(self.uid()),
MessageDataItemName::Flags => Ok(self.flags()),
MessageDataItemName::Rfc822Size => Ok(self.rfc_822_size()),
MessageDataItemName::Rfc822Header => Ok(self.rfc_822_header()),
MessageDataItemName::Rfc822Text => self.rfc_822_text(),
MessageDataItemName::Rfc822 => self.rfc822(),
MessageDataItemName::Envelope => Ok(self.envelope()),
MessageDataItemName::Body => self.body(),
MessageDataItemName::BodyStructure => self.body_structure(),
MessageDataItemName::BodyExt {
section,
partial,
peek,
} => {
let (body, has_seen) = self.body_ext(section, partial, peek)?;
seen = has_seen;
Ok(body)
}
MessageDataItemName::InternalDate => self.internal_date(),
})
.collect::<Result<Vec<_>, _>>()?;
Ok((
Body::Data(Data::Fetch {
seq: self.ids.i,
items: res_attrs.try_into()?,
}),
seen,
))
}
}
pub enum SeenFlag {
DoNothing,
MustAdd,
}
// -------------------
pub enum FetchedMail<'a> {
Partial(imf::Imf<'a>),
Full(AnyPart<'a>),
}
impl<'a> FetchedMail<'a> {
pub fn new_from_message(msg: Message<'a>) -> Self {
FetchedMail::Full(AnyPart::Msg(msg))
}
/*fn new_from_header(hdr: imf::Imf<'a>) -> Self {
FetchedMail::Partial(hdr)
}*/
fn as_anypart(&self) -> Result<&AnyPart<'a>> {
match self {
FetchedMail::Full(x) => Ok(&x),
_ => bail!("The full message must be fetched, not only its headers"),
}
}
fn as_full(&self) -> Result<&Message<'a>> {
match self {
FetchedMail::Full(AnyPart::Msg(x)) => Ok(&x),
_ => bail!("The full message must be fetched, not only its headers AND it must be an AnyPart::Msg."),
}
}
fn imf(&self) -> &imf::Imf<'a> {
match self {
FetchedMail::Full(AnyPart::Msg(x)) => &x.imf,
FetchedMail::Partial(x) => &x,
_ => panic!("Can't contain AnyPart that is not a message"),
}
}
}
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