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|
use std::borrow::Borrow;
use std::collections::HashMap;
use std::num::NonZeroU32;
use std::sync::Arc;
use anyhow::{anyhow, bail, Error, Result};
use boitalettres::proto::res::body::Data as Body;
use chrono::{Offset, TimeZone, Utc};
use futures::stream::{FuturesOrdered, StreamExt};
use imap_codec::types::address::Address;
use imap_codec::types::body::{BasicFields, Body as FetchBody, BodyStructure, SpecificFields};
use imap_codec::types::core::{Atom, IString, NString, NonZeroBytes};
use imap_codec::types::datetime::MyDateTime;
use imap_codec::types::envelope::Envelope;
use imap_codec::types::fetch_attributes::{FetchAttribute, MacroOrFetchAttributes};
use imap_codec::types::flag::Flag;
use imap_codec::types::response::{Code, Data, MessageAttribute, Status};
use imap_codec::types::sequence::{self, SequenceSet};
use mail_parser::*;
use crate::mail::mailbox::Mailbox;
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<Mailbox>,
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.
/// These are the messages that are sent in response to a SELECT command.
pub async fn new(mailbox: Arc<Mailbox>) -> Result<(Self, Vec<Body>)> {
// TODO THIS IS JUST A TEST REMOVE LATER
mailbox.test().await?;
let state = mailbox.current_uid_index().await;
let new_view = Self {
mailbox,
known_state: state,
};
let mut data = Vec::<Body>::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))
}
/// Looks up state changes in the mailbox and produces a set of IMAP
/// responses describing the changes.
pub async fn sync_update(&mut self) -> Result<Vec<Body>> {
self.mailbox.sync().await?;
// TODO THIS IS JUST A TEST REMOVE LATER
self.mailbox.test().await?;
self.update().await
}
/// Produces a set of IMAP responses describing the change between
/// what the client knows and what is actually in the mailbox.
pub async fn update(&mut self) -> Result<Vec<Body>> {
let new_view = MailboxView {
mailbox: self.mailbox.clone(),
known_state: self.mailbox.current_uid_index().await,
};
let mut data = Vec::<Body>::new();
if new_view.known_state.uidvalidity != self.known_state.uidvalidity {
// TODO: do we want to push less/more info than this?
data.push(new_view.uidvalidity()?);
data.push(new_view.exists()?);
data.push(new_view.uidnext()?);
} else {
// Calculate diff between two mailbox states
// See example in IMAP RFC in section on NOOP command:
// we want to produce something like this:
// C: a047 NOOP
// S: * 22 EXPUNGE
// S: * 23 EXISTS
// S: * 14 FETCH (UID 1305 FLAGS (\Seen \Deleted))
// S: a047 OK Noop completed
// In other words:
// - notify client of expunged mails
// - if new mails arrived, notify client of number of existing mails
// - if flags changed for existing mails, tell client
// - notify client of expunged mails
let mut n_expunge = 0;
for (i, (_uid, uuid)) in self.known_state.idx_by_uid.iter().enumerate() {
if !new_view.known_state.table.contains_key(uuid) {
data.push(Body::Data(Data::Expunge(
NonZeroU32::try_from((i + 1 - n_expunge) as u32).unwrap(),
)));
n_expunge += 1;
}
}
// - if new mails arrived, notify client of number of existing mails
if new_view.known_state.table.len() != self.known_state.table.len() - n_expunge {
data.push(new_view.exists()?);
}
// - if flags changed for existing mails, tell client
for (i, (_uid, uuid)) in new_view.known_state.idx_by_uid.iter().enumerate() {
let old_mail = self.known_state.table.get(uuid);
let new_mail = new_view.known_state.table.get(uuid);
if old_mail.is_some() && old_mail != new_mail {
if let Some((uid, flags)) = new_mail {
data.push(Body::Data(Data::Fetch {
seq_or_uid: NonZeroU32::try_from((i + 1) as u32).unwrap(),
attributes: vec![
MessageAttribute::Uid((*uid).try_into().unwrap()),
MessageAttribute::Flags(
flags.iter().filter_map(|f| string_to_flag(f)).collect(),
),
],
}));
}
}
}
}
*self = new_view;
Ok(data)
}
/// Looks up state changes in the mailbox and produces a set of IMAP
/// responses describing the new state.
pub async fn fetch(
&self,
sequence_set: &SequenceSet,
attributes: &MacroOrFetchAttributes,
uid: &bool,
) -> Result<Vec<Body>> {
if *uid {
bail!("UID FETCH not implemented");
}
let mail_vec = self
.known_state
.idx_by_uid
.iter()
.map(|(uid, uuid)| (*uid, *uuid))
.collect::<Vec<_>>();
let mut mails = vec![];
let iter_strat = sequence::Strategy::Naive {
largest: NonZeroU32::try_from((self.known_state.idx_by_uid.len() + 1) as u32).unwrap(),
};
for i in sequence_set.iter(iter_strat) {
if let Some(mail) = mail_vec.get(i.get() as usize - 1) {
mails.push((i, *mail));
} else {
bail!("No such mail: {}", i);
}
}
let mails_uuid = mails
.iter()
.map(|(_i, (_uid, uuid))| *uuid)
.collect::<Vec<_>>();
let mails_meta = self.mailbox.fetch_meta(&mails_uuid).await?;
let fetch_attrs = match attributes {
MacroOrFetchAttributes::Macro(m) => m.expand(),
MacroOrFetchAttributes::FetchAttributes(a) => a.clone(),
};
let need_body = fetch_attrs.iter().any(|x| {
matches!(
x,
FetchAttribute::Body
| FetchAttribute::BodyExt { .. }
| FetchAttribute::Rfc822
| FetchAttribute::Rfc822Text
| FetchAttribute::BodyStructure
)
});
let mails = if need_body {
let mut iter = mails
.into_iter()
.zip(mails_meta.into_iter())
.map(|((i, (uid, uuid)), meta)| async move {
let body = self.mailbox.fetch_full(uuid, &meta.message_key).await?;
Ok::<_, anyhow::Error>((i, uid, uuid, meta, Some(body)))
})
.collect::<FuturesOrdered<_>>();
let mut mails = vec![];
while let Some(m) = iter.next().await {
mails.push(m?);
}
mails
} else {
mails
.into_iter()
.zip(mails_meta.into_iter())
.map(|((i, (uid, uuid)), meta)| (i, uid, uuid, meta, None))
.collect::<Vec<_>>()
};
let mut ret = vec![];
for (i, uid, uuid, meta, body) in mails {
let mut attributes = vec![MessageAttribute::Uid(uid)];
let (_uid2, flags) = self
.known_state
.table
.get(&uuid)
.ok_or_else(|| anyhow!("Mail not in uidindex table: {}", uuid))?;
let parsed = match &body {
Some(m) => {
mail_parser::Message::parse(m).ok_or_else(|| anyhow!("Invalid mail body"))?
}
None => mail_parser::Message::parse(&meta.headers)
.ok_or_else(|| anyhow!("Invalid mail headers"))?,
};
for attr in fetch_attrs.iter() {
match attr {
FetchAttribute::Uid => (),
FetchAttribute::Flags => {
attributes.push(MessageAttribute::Flags(
flags.iter().filter_map(|f| string_to_flag(f)).collect(),
));
}
FetchAttribute::Rfc822Size => {
attributes.push(MessageAttribute::Rfc822Size(meta.rfc822_size as u32))
}
FetchAttribute::Rfc822Header => attributes.push(
MessageAttribute::Rfc822Header(NString(Some(IString::Literal(
meta.headers
.clone()
.try_into()
.or(Err(Error::msg("IString conversion error")))?,
)))),
),
FetchAttribute::Rfc822Text => {
let r = parsed
.raw_message.get(parsed.offset_body..parsed.offset_end)
.ok_or(Error::msg("Unable to extract email body, cursors out of bound. This is a bug."))?
.try_into()
.or(Err(Error::msg("IString conversion error")))?;
attributes.push(MessageAttribute::Rfc822Text(NString(Some(
IString::Literal(r),
))))
}
FetchAttribute::Rfc822 => {
attributes.push(MessageAttribute::Rfc822(NString(Some(IString::Literal(
body.as_ref().unwrap().clone().try_into().unwrap(),
)))))
}
FetchAttribute::Envelope => {
attributes.push(MessageAttribute::Envelope(message_envelope(&parsed)))
}
FetchAttribute::Body => attributes.push(MessageAttribute::Body(
build_imap_email_struct(&parsed, &parsed.structure)?,
)),
FetchAttribute::BodyStructure => attributes.push(MessageAttribute::Body(
build_imap_email_struct(&parsed, &parsed.structure)?,
)),
FetchAttribute::BodyExt {
section,
partial,
peek,
} => {
// @TODO This is a stub
let is = IString::try_from("test").unwrap();
attributes.push(MessageAttribute::BodyExt {
section: None,
origin: None,
data: NString(Some(is)),
})
}
FetchAttribute::InternalDate => {
attributes.push(MessageAttribute::InternalDate(MyDateTime(
Utc.fix()
.timestamp(i64::try_from(meta.internaldate / 1000)?, 0),
)));
}
}
}
ret.push(Body::Data(Data::Fetch {
seq_or_uid: i,
attributes,
}));
}
Ok(ret)
}
// ----
/// Produce an OK [UIDVALIDITY _] message corresponding to `known_state`
fn uidvalidity(&self) -> Result<Body> {
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<Body> {
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<Option<Body>> {
let unseen = self
.known_state
.idx_by_flag
.get(&"$unseen".to_string())
.and_then(|os| os.get_min())
.cloned();
if let Some(unseen) = unseen {
let status_unseen =
Status::ok(None, Some(Code::Unseen(unseen.clone())), "First unseen UID")
.map_err(Error::msg)?;
Ok(Some(Body::Status(status_unseen)))
} else {
Ok(None)
}
}
/// Produce an EXISTS message corresponding to the number of mails
/// in `known_state`
fn exists(&self) -> Result<Body> {
let exists = u32::try_from(self.known_state.idx_by_uid.len())?;
Ok(Body::Data(Data::Exists(exists)))
}
/// Produce a RECENT message corresponding to the number of
/// recent mails in `known_state`
fn recent(&self) -> Result<Body> {
let recent = self
.known_state
.idx_by_flag
.get(&"\\Recent".to_string())
.map(|os| os.len())
.unwrap_or(0);
let recent = u32::try_from(recent)?;
Ok(Body::Data(Data::Recent(recent)))
}
/// Produce a FLAGS and a PERMANENTFLAGS message that indicates
/// the flags that are in `known_state` + default flags
fn flags(&self) -> Result<Vec<Body>> {
let mut flags: Vec<Flag> = self
.known_state
.idx_by_flag
.flags()
.map(|f| string_to_flag(f))
.flatten()
.collect();
for f in DEFAULT_FLAGS.iter() {
if !flags.contains(f) {
flags.push(f.clone());
}
}
let mut ret = vec![Body::Data(Data::Flags(flags.clone()))];
flags.push(Flag::Permanent);
let permanent_flags =
Status::ok(None, Some(Code::PermanentFlags(flags)), "Flags permitted")
.map_err(Error::msg)?;
ret.push(Body::Status(permanent_flags));
Ok(ret)
}
}
fn string_to_flag(f: &str) -> Option<Flag> {
match f.chars().next() {
Some('\\') => None,
Some('$') 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,
}
}
fn message_envelope(msg: &mail_parser::Message<'_>) -> Envelope {
Envelope {
date: NString(
msg.get_date()
.map(|d| IString::try_from(d.to_iso8601()).unwrap()),
),
subject: NString(
msg.get_subject()
.map(|d| IString::try_from(d.to_string()).unwrap()),
),
from: convert_addresses(msg.get_from()),
sender: convert_addresses(msg.get_sender()),
reply_to: convert_addresses(msg.get_reply_to()),
to: convert_addresses(msg.get_to()),
cc: convert_addresses(msg.get_cc()),
bcc: convert_addresses(msg.get_bcc()),
in_reply_to: NString(None), // TODO
message_id: NString(
msg.get_message_id()
.map(|d| IString::try_from(d.to_string()).unwrap()),
),
}
}
fn convert_addresses(a: &mail_parser::HeaderValue<'_>) -> Vec<Address> {
match a {
mail_parser::HeaderValue::Address(a) => vec![convert_address(a)],
mail_parser::HeaderValue::AddressList(a) => {
let mut ret = vec![];
for aa in a {
ret.push(convert_address(aa));
}
ret
}
mail_parser::HeaderValue::Empty => vec![],
mail_parser::HeaderValue::Collection(c) => {
let mut ret = vec![];
for cc in c.iter() {
ret.extend(convert_addresses(cc).into_iter());
}
ret
}
_ => panic!("Invalid address header"),
}
}
fn convert_address(a: &mail_parser::Addr<'_>) -> Address {
let (user, host) = match &a.address {
None => (None, None),
Some(x) => match x.split_once('@') {
Some((u, h)) => (Some(u.to_string()), Some(h.to_string())),
None => (Some(x.to_string()), None),
},
};
Address::new(
NString(
a.name
.as_ref()
.map(|x| IString::try_from(x.to_string()).unwrap()),
),
NString(None),
NString(user.map(|x| IString::try_from(x).unwrap())),
NString(host.map(|x| IString::try_from(x).unwrap())),
)
}
/*
--CAPTURE--
b fetch 29878:29879 (BODY)
* 29878 FETCH (BODY (("text" "plain" ("charset" "utf-8") NIL NIL "quoted-printable" 3264 82)("text" "html" ("charset" "utf-8") NIL NIL "quoted-printable" 31834 643) "alternative"))
* 29879 FETCH (BODY ("text" "html" ("charset" "us-ascii") NIL NIL "7bit" 4107 131))
^^^^^^^^^^^^^^^^^^^^^^ ^^^ ^^^ ^^^^^^ ^^^^ ^^^
| | | | | | number of lines
| | | | | size
| | | | content transfer encoding
| | | description
| | id
| parameter list
b OK Fetch completed (0.001 + 0.000 secs).
*/
fn build_imap_email_struct<'a>(
msg: &Message<'a>,
node: &MessageStructure,
) -> Result<BodyStructure> {
match node {
MessageStructure::Part(id) => {
let part = msg.parts.get(*id).ok_or(anyhow!(
"Email part referenced in email structure is missing"
))?;
match part {
MessagePart::Multipart(_) => {
unreachable!("A multipart entry can not be found here.")
}
MessagePart::Text(bp) => {
// Extract subtype+attributes from Content-Type header
let (st, ct_attrs) = match bp.headers_rfc.get(&RfcHeader::ContentType) {
Some(HeaderValue::ContentType(c)) => {
(c.c_subtype.as_ref(), c.attributes.as_ref())
}
_ => (None, None),
};
// Transform the Content-Type attributes into IMAP's parameter list
// Also check if there is a charset defined.
let (charset_found, mut parameter_list) = ct_attrs
.map(|attr| {
attr.iter().fold(
(false, vec![]),
|(charset_found, mut param_list), (k, v)| {
let nk = k.to_lowercase();
match (
IString::try_from(k.as_ref()),
IString::try_from(v.as_ref()),
) {
(Ok(ik), Ok(iv)) => param_list.push((ik, iv)),
_ => (),
};
(charset_found || nk == "charset", param_list)
},
)
})
.unwrap_or((false, vec![]));
// If the charset is not defined, set it to "us-ascii"
if !charset_found {
parameter_list
.push((unchecked_istring("charset"), unchecked_istring("us-ascii")));
}
// If the subtype is not defined, set it to "plain"
let subtype = st
.map(|st| IString::try_from(st.clone().into_owned()).ok())
.flatten()
.unwrap_or(unchecked_istring("plain"));
Ok(BodyStructure::Single {
body: FetchBody {
basic: BasicFields {
parameter_list,
id: match bp.headers_rfc.get(&RfcHeader::ContentId) {
Some(HeaderValue::Text(v)) => {
NString(IString::try_from(v.to_string()).ok())
}
_ => NString(None),
},
description: match bp
.headers_rfc
.get(&RfcHeader::ContentDescription)
{
Some(HeaderValue::Text(v)) => {
NString(IString::try_from(v.to_string()).ok())
}
_ => NString(None),
},
content_transfer_encoding: match bp
.headers_rfc
.get(&RfcHeader::ContentTransferEncoding)
{
Some(HeaderValue::Text(v)) => IString::try_from(v.to_string())
.unwrap_or(unchecked_istring("7bit")),
_ => unchecked_istring("7bit"),
},
size: u32::try_from(bp.len())?,
},
specific: SpecificFields::Text {
subtype,
number_of_lines: u32::try_from(
bp.get_text_contents().lines().count(),
)?,
},
},
extension: None,
})
}
MessagePart::Html(bp) => {
todo!()
}
MessagePart::Binary(_) => todo!(),
MessagePart::InlineBinary(_) => todo!(),
MessagePart::Message(_) => todo!(),
}
}
MessageStructure::List(l) => todo!(),
/*BodyStructure::Multi {
bodies: l.map(|inner_node| build_email_struct(msg, inner_node)),
subtype: "",
extension_data: None,
},*/
MessageStructure::MultiPart((id, l)) => {
todo!()
/*let part = msg.parts.get(id)?;
let mp = match part {
MessagePart::Multipart(mp) => mp,
_ => unreachable!("Only a MessagePart part entry is allowed here.");
}
BodyStructure::Multi {
bodies: l.map(|inner_node| build_email_struct(msg, inner_node)),
subtype: "",
extension_data: Some(MultipartExtensionData {
parameter_list: vec![],
disposition: None,
language: None,
location: None,
extension: vec![],
})
}
*/
}
}
}
/// s is set to static to ensure that only compile time values
/// checked by the developpers are passed.
fn unchecked_istring(s: &'static str) -> IString {
IString::try_from(s).expect("this value is expected to be a valid imap-codec::IString")
}
#[cfg(test)]
mod tests {
use super::*;
use imap_codec::codec::Encode;
use std::fs;
/// Future automated test. We use lossy utf8 conversion + lowercasing everything,
/// so this test might allow invalid results. But at least it allows us to quickly test a
/// large variety of emails.
/// Keep in mind that special cases must still be tested manually!
#[test]
fn fetch_body() -> Result<()> {
let txt = fs::read("tests/emails/dxflrs/0001_simple.eml")?;
let exp = fs::read("tests/emails/dxflrs/0001_simple.body")?;
let message = Message::parse(&txt).unwrap();
let mut resp = Vec::new();
MessageAttribute::Body(build_imap_email_struct(&message, &message.structure)?)
.encode(&mut resp);
let resp_str = String::from_utf8_lossy(&resp).to_lowercase();
let exp_no_parenthesis = &exp[1..exp.len() - 1];
let exp_str = String::from_utf8_lossy(exp_no_parenthesis).to_lowercase();
println!("mine: {}\nexpected: {}", resp_str, exp_str);
assert_eq!(resp_str, exp_str);
Ok(())
}
}
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