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This commit is contained in:
Quentin 2024-01-04 20:54:21 +01:00
parent b22df840db
commit 2a9ae1297b
Signed by: quentin
GPG Key ID: E9602264D639FF68
8 changed files with 581 additions and 1118 deletions
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51
src/imap/attributes.rs Normal file
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@ -0,0 +1,51 @@
use imap_codec::imap_types::fetch::{
MacroOrMessageDataItemNames, MessageDataItemName,
};
/// Internal decisions based on fetched attributes
/// passed by the client
pub struct AttributesProxy {
pub attrs: Vec<MessageDataItemName<'static>>,
}
impl AttributesProxy {
pub fn new(attrs: &MacroOrMessageDataItemNames<'static>, is_uid_fetch: bool) -> Self {
// Expand macros
let mut fetch_attrs = match attrs {
MacroOrMessageDataItemNames::Macro(m) => {
use imap_codec::imap_types::fetch::Macro;
use MessageDataItemName::*;
match m {
Macro::All => vec![Flags, InternalDate, Rfc822Size, Envelope],
Macro::Fast => vec![Flags, InternalDate, Rfc822Size],
Macro::Full => vec![Flags, InternalDate, Rfc822Size, Envelope, Body],
_ => {
tracing::error!("unimplemented macro");
vec![]
}
}
}
MacroOrMessageDataItemNames::MessageDataItemNames(a) => a.clone(),
};
// Handle uids
if is_uid_fetch && !fetch_attrs.contains(&MessageDataItemName::Uid) {
fetch_attrs.push(MessageDataItemName::Uid);
}
Self { attrs: fetch_attrs }
}
pub fn need_body(&self) -> bool {
self.attrs.iter().any(|x| {
matches!(
x,
MessageDataItemName::Body
| MessageDataItemName::BodyExt { .. }
| MessageDataItemName::Rfc822
| MessageDataItemName::Rfc822Text
| MessageDataItemName::BodyStructure
)
})
}
}

30
src/imap/flags.rs Normal file
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@ -0,0 +1,30 @@
use imap_codec::imap_types::core::Atom;
use imap_codec::imap_types::flag::{Flag, FlagFetch};
pub fn from_str(f: &str) -> Option<FlagFetch<'static>> {
match f.chars().next() {
Some('\\') => match f {
"\\Seen" => Some(FlagFetch::Flag(Flag::Seen)),
"\\Answered" => Some(FlagFetch::Flag(Flag::Answered)),
"\\Flagged" => Some(FlagFetch::Flag(Flag::Flagged)),
"\\Deleted" => Some(FlagFetch::Flag(Flag::Deleted)),
"\\Draft" => Some(FlagFetch::Flag(Flag::Draft)),
"\\Recent" => Some(FlagFetch::Recent),
_ => match Atom::try_from(f.strip_prefix('\\').unwrap().to_string()) {
Err(_) => {
tracing::error!(flag=%f, "Unable to encode flag as IMAP atom");
None
}
Ok(a) => Some(FlagFetch::Flag(Flag::system(a))),
},
},
Some(_) => match Atom::try_from(f.to_string()) {
Err(_) => {
tracing::error!(flag=%f, "Unable to encode flag as IMAP atom");
None
}
Ok(a) => Some(FlagFetch::Flag(Flag::keyword(a))),
},
None => None,
}
}

129
src/imap/imf_view.rs Normal file
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@ -0,0 +1,129 @@
use std::borrow::Cow;
use std::iter::zip;
use std::num::NonZeroU32;
use std::sync::Arc;
use anyhow::{anyhow, bail, Error, Result};
use chrono::{Offset, TimeZone, Utc};
use futures::stream::{FuturesOrdered, StreamExt};
use imap_codec::imap_types::body::{BasicFields, Body as FetchBody, BodyStructure, SpecificFields};
use imap_codec::imap_types::core::{AString, Atom, IString, NString, NonEmptyVec};
use imap_codec::imap_types::datetime::DateTime;
use imap_codec::imap_types::envelope::{Address, Envelope};
use imap_codec::imap_types::fetch::{
MacroOrMessageDataItemNames, MessageDataItem, MessageDataItemName, Section as FetchSection,
};
use imap_codec::imap_types::flag::{Flag, FlagFetch, FlagPerm, StoreResponse, StoreType};
use imap_codec::imap_types::response::{Code, Data, Status};
use imap_codec::imap_types::sequence::{self, SequenceSet};
use eml_codec::{
header, imf, mime,
mime::r#type::Deductible,
part::{composite::Message, AnyPart},
};
use crate::cryptoblob::Key;
use crate::imap::response::Body;
use crate::mail::mailbox::{MailMeta, Mailbox};
use crate::mail::uidindex::{ImapUid, ImapUidvalidity, UidIndex};
use crate::mail::unique_ident::UniqueIdent;
/// Envelope rules are defined in RFC 3501, section 7.4.2
/// https://datatracker.ietf.org/doc/html/rfc3501#section-7.4.2
///
/// Some important notes:
///
/// If the Sender or Reply-To lines are absent in the [RFC-2822]
/// header, or are present but empty, the server sets the
/// corresponding member of the envelope to be the same value as
/// the from member (the client is not expected to know to do
/// this). Note: [RFC-2822] requires that all messages have a valid
/// From header. Therefore, the from, sender, and reply-to
/// members in the envelope can not be NIL.
///
/// If the Date, Subject, In-Reply-To, and Message-ID header lines
/// are absent in the [RFC-2822] header, the corresponding member
/// of the envelope is NIL; if these header lines are present but
/// empty the corresponding member of the envelope is the empty
/// string.
//@FIXME return an error if the envelope is invalid instead of panicking
//@FIXME some fields must be defaulted if there are not set.
pub fn message_envelope(msg: &imf::Imf) -> Envelope<'static> {
let from = msg.from.iter().map(convert_mbx).collect::<Vec<_>>();
Envelope {
date: NString(
msg.date
.as_ref()
.map(|d| IString::try_from(d.to_rfc3339()).unwrap()),
),
subject: NString(
msg.subject
.as_ref()
.map(|d| IString::try_from(d.to_string()).unwrap()),
),
sender: msg
.sender
.as_ref()
.map(|v| vec![convert_mbx(v)])
.unwrap_or(from.clone()),
reply_to: if msg.reply_to.is_empty() {
from.clone()
} else {
convert_addresses(&msg.reply_to)
},
from,
to: convert_addresses(&msg.to),
cc: convert_addresses(&msg.cc),
bcc: convert_addresses(&msg.bcc),
in_reply_to: NString(
msg.in_reply_to
.iter()
.next()
.map(|d| IString::try_from(d.to_string()).unwrap()),
),
message_id: NString(
msg.msg_id
.as_ref()
.map(|d| IString::try_from(d.to_string()).unwrap()),
),
}
}
pub fn convert_addresses(addrlist: &Vec<imf::address::AddressRef>) -> Vec<Address<'static>> {
let mut acc = vec![];
for item in addrlist {
match item {
imf::address::AddressRef::Single(a) => acc.push(convert_mbx(a)),
imf::address::AddressRef::Many(l) => acc.extend(l.participants.iter().map(convert_mbx)),
}
}
return acc;
}
pub fn convert_mbx(addr: &imf::mailbox::MailboxRef) -> Address<'static> {
Address {
name: NString(
addr.name
.as_ref()
.map(|x| IString::try_from(x.to_string()).unwrap()),
),
// SMTP at-domain-list (source route) seems obsolete since at least 1991
// https://www.mhonarc.org/archive/html/ietf-822/1991-06/msg00060.html
adl: NString(None),
mailbox: NString(Some(
IString::try_from(addr.addrspec.local_part.to_string()).unwrap(),
)),
host: NString(Some(
IString::try_from(addr.addrspec.domain.to_string()).unwrap(),
)),
}
}

232
src/imap/mail_view.rs Normal file
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@ -0,0 +1,232 @@
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"),
}
}
}

856
src/imap/mailbox_view.rs
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@ -1,33 +1,23 @@
use std::borrow::Cow;
use std::iter::zip;
use std::num::NonZeroU32;
use std::sync::Arc;
use anyhow::{anyhow, bail, Error, Result};
use chrono::{Offset, TimeZone, Utc};
use futures::stream::{FuturesOrdered, StreamExt};
use imap_codec::imap_types::body::{BasicFields, Body as FetchBody, BodyStructure, SpecificFields};
use imap_codec::imap_types::core::{AString, Atom, IString, NString, NonEmptyVec};
use imap_codec::imap_types::datetime::DateTime;
use imap_codec::imap_types::envelope::{Address, Envelope};
use imap_codec::imap_types::fetch::{
MacroOrMessageDataItemNames, MessageDataItem, MessageDataItemName, Section as FetchSection,
MacroOrMessageDataItemNames, MessageDataItem
};
use imap_codec::imap_types::flag::{Flag, FlagFetch, FlagPerm, StoreResponse, StoreType};
use imap_codec::imap_types::response::{Code, Data, Status};
use imap_codec::imap_types::sequence::{self, SequenceSet};
use eml_codec::{
header, imf, mime,
mime::r#type::Deductible,
part::{composite::Message, AnyPart},
};
use crate::cryptoblob::Key;
use crate::imap::flags;
use crate::imap::response::Body;
use crate::mail::mailbox::{MailMeta, Mailbox};
use crate::imap::attributes::AttributesProxy;
use crate::imap::selectors::MailSelectionBuilder;
use crate::imap::mail_view::SeenFlag;
use crate::mail::mailbox::Mailbox;
use crate::mail::uidindex::{ImapUid, ImapUidvalidity, UidIndex};
use crate::mail::unique_ident::UniqueIdent;
@ -39,377 +29,6 @@ const DEFAULT_FLAGS: [Flag; 5] = [
Flag::Draft,
];
enum FetchedMail<'a> {
Partial(imf::Imf<'a>),
Full(AnyPart<'a>),
}
impl<'a> FetchedMail<'a> {
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"),
}
}
}
pub struct AttributesProxy {
attrs: Vec<MessageDataItemName<'static>>,
}
impl AttributesProxy {
fn new(attrs: &MacroOrMessageDataItemNames<'static>, is_uid_fetch: bool) -> Self {
// Expand macros
let mut fetch_attrs = match attrs {
MacroOrMessageDataItemNames::Macro(m) => {
use imap_codec::imap_types::fetch::Macro;
use MessageDataItemName::*;
match m {
Macro::All => vec![Flags, InternalDate, Rfc822Size, Envelope],
Macro::Fast => vec![Flags, InternalDate, Rfc822Size],
Macro::Full => vec![Flags, InternalDate, Rfc822Size, Envelope, Body],
_ => {
tracing::error!("unimplemented macro");
vec![]
}
}
}
MacroOrMessageDataItemNames::MessageDataItemNames(a) => a.clone(),
};
// Handle uids
if is_uid_fetch && !fetch_attrs.contains(&MessageDataItemName::Uid) {
fetch_attrs.push(MessageDataItemName::Uid);
}
Self { attrs: fetch_attrs }
}
fn need_body(&self) -> bool {
self.attrs.iter().any(|x| {
matches!(
x,
MessageDataItemName::Body
| MessageDataItemName::BodyExt { .. }
| MessageDataItemName::Rfc822
| MessageDataItemName::Rfc822Text
| MessageDataItemName::BodyStructure
)
})
}
}
pub struct MailIdentifiers {
i: NonZeroU32,
uid: ImapUid,
uuid: UniqueIdent,
}
struct MailIdentifiersList(Vec<MailIdentifiers>);
impl MailIdentifiersList {
fn uuids(&self) -> Vec<UniqueIdent> {
self.0.iter().map(|mi| mi.uuid).collect()
}
}
pub struct MailView<'a> {
ids: &'a MailIdentifiers,
meta: &'a MailMeta,
flags: &'a Vec<String>,
content: FetchedMail<'a>,
}
enum SeenFlag {
DoNothing,
MustAdd,
}
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| string_to_flag(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(build_imap_email_struct(
self.content.as_full()?.child.as_ref(),
)?))
}
fn body_structure(&self) -> Result<MessageDataItem<'static>> {
Ok(MessageDataItem::Body(build_imap_email_struct(
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)> {
let mut seen = SeenFlag::DoNothing;
// Extract message section
let text = get_message_section(self.content.as_anypart()?, section)?;
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;
}
// Handle <<partial>> which cut the message bytes
let (text, origin) = apply_partial(partial, &text);
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)))
}
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,
))
}
}
fn apply_partial<'a>(
partial: &'_ Option<(u32, NonZeroU32)>,
text: &'a [u8],
) -> (&'a [u8], Option<u32>) {
match partial {
Some((begin, len)) => {
if *begin as usize > text.len() {
(&[][..], Some(*begin))
} else if (begin + len.get()) as usize >= text.len() {
(&text[*begin as usize..], Some(*begin))
} else {
(
&text[*begin as usize..(begin + len.get()) as usize],
Some(*begin),
)
}
}
None => (&text[..], None),
}
}
pub struct BodyIdentifier<'a> {
msg_uuid: &'a UniqueIdent,
msg_key: &'a Key,
}
#[derive(Default)]
pub struct MailSelectionBuilder<'a> {
//attrs: AttributeProxy,
mail_count: usize,
need_body: bool,
mi: &'a [MailIdentifiers],
meta: &'a [MailMeta],
flags: &'a [&'a Vec<String>],
bodies: &'a [Vec<u8>],
}
impl<'a> MailSelectionBuilder<'a> {
fn new(need_body: bool, mail_count: usize) -> Self {
Self {
mail_count,
need_body,
..MailSelectionBuilder::default()
}
}
fn with_mail_identifiers(&mut self, mi: &'a [MailIdentifiers]) -> &mut Self {
self.mi = mi;
self
}
fn with_metadata(&mut self, meta: &'a [MailMeta]) -> &mut Self {
self.meta = meta;
self
}
fn with_flags(&mut self, flags: &'a [&'a Vec<String>]) -> &mut Self {
self.flags = flags;
self
}
fn bodies_to_collect(&self) -> Vec<BodyIdentifier> {
if !self.need_body {
return vec![];
}
zip(self.mi, self.meta)
.map(|(mi, meta)| BodyIdentifier {
msg_uuid: &mi.uuid,
msg_key: &meta.message_key,
})
.collect::<Vec<_>>()
}
fn with_bodies(&mut self, rbodies: &'a [Vec<u8>]) -> &mut Self {
self.bodies = rbodies;
self
}
fn build(&self) -> Result<Vec<MailView<'a>>> {
let mut bodies = vec![];
if !self.need_body {
for m in self.meta.iter() {
let (_, hdrs) =
eml_codec::parse_imf(&m.headers).or(Err(anyhow!("Invalid mail headers")))?;
bodies.push(FetchedMail::Partial(hdrs));
}
} else {
for rb in self.bodies.iter() {
let (_, p) = eml_codec::parse_message(&rb).or(Err(anyhow!("Invalid mail body")))?;
bodies.push(FetchedMail::new_from_message(p));
}
}
if self.mi.len() != self.mail_count && self.meta.len() != self.mail_count
|| self.flags.len() != self.mail_count
|| bodies.len() != self.mail_count
{
return Err(anyhow!("Can't build a mail view selection as parts were not correctly registered into the builder."));
}
Ok(zip(self.mi, zip(self.meta, zip(self.flags, bodies)))
.map(|(ids, (meta, (flags, content)))| MailView {
ids,
meta,
flags,
content,
})
.collect())
}
}
/// 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
@ -497,7 +116,7 @@ impl MailboxView {
items: vec![
MessageDataItem::Uid(*uid),
MessageDataItem::Flags(
flags.iter().filter_map(|f| string_to_flag(f)).collect(),
flags.iter().filter_map(|f| flags::from_str(f)).collect(),
),
]
.try_into()?,
@ -853,7 +472,7 @@ impl MailboxView {
.known_state
.idx_by_flag
.flags()
.filter_map(|f| match string_to_flag(f) {
.filter_map(|f| match flags::from_str(f) {
Some(FlagFetch::Flag(fl)) => Some(fl),
_ => None,
})
@ -900,456 +519,40 @@ impl MailboxView {
}
}
fn string_to_flag(f: &str) -> Option<FlagFetch<'static>> {
match f.chars().next() {
Some('\\') => match f {
"\\Seen" => Some(FlagFetch::Flag(Flag::Seen)),
"\\Answered" => Some(FlagFetch::Flag(Flag::Answered)),
"\\Flagged" => Some(FlagFetch::Flag(Flag::Flagged)),
"\\Deleted" => Some(FlagFetch::Flag(Flag::Deleted)),
"\\Draft" => Some(FlagFetch::Flag(Flag::Draft)),
"\\Recent" => Some(FlagFetch::Recent),
_ => match Atom::try_from(f.strip_prefix('\\').unwrap().to_string()) {
Err(_) => {
tracing::error!(flag=%f, "Unable to encode flag as IMAP atom");
None
}
Ok(a) => Some(FlagFetch::Flag(Flag::system(a))),
},
},
Some(_) => match Atom::try_from(f.to_string()) {
Err(_) => {
tracing::error!(flag=%f, "Unable to encode flag as IMAP atom");
None
}
Ok(a) => Some(FlagFetch::Flag(Flag::keyword(a))),
},
None => None,
}
pub struct MailIdentifiers {
pub i: NonZeroU32,
pub uid: ImapUid,
pub uuid: UniqueIdent,
}
pub struct MailIdentifiersList(Vec<MailIdentifiers>);
/// Envelope rules are defined in RFC 3501, section 7.4.2
/// https://datatracker.ietf.org/doc/html/rfc3501#section-7.4.2
///
/// Some important notes:
///
/// If the Sender or Reply-To lines are absent in the [RFC-2822]
/// header, or are present but empty, the server sets the
/// corresponding member of the envelope to be the same value as
/// the from member (the client is not expected to know to do
/// this). Note: [RFC-2822] requires that all messages have a valid
/// From header. Therefore, the from, sender, and reply-to
/// members in the envelope can not be NIL.
///
/// If the Date, Subject, In-Reply-To, and Message-ID header lines
/// are absent in the [RFC-2822] header, the corresponding member
/// of the envelope is NIL; if these header lines are present but
/// empty the corresponding member of the envelope is the empty
/// string.
//@FIXME return an error if the envelope is invalid instead of panicking
//@FIXME some fields must be defaulted if there are not set.
fn message_envelope(msg: &imf::Imf) -> Envelope<'static> {
let from = msg.from.iter().map(convert_mbx).collect::<Vec<_>>();
Envelope {
date: NString(
msg.date
.as_ref()
.map(|d| IString::try_from(d.to_rfc3339()).unwrap()),
),
subject: NString(
msg.subject
.as_ref()
.map(|d| IString::try_from(d.to_string()).unwrap()),
),
sender: msg
.sender
.as_ref()
.map(|v| vec![convert_mbx(v)])
.unwrap_or(from.clone()),
reply_to: if msg.reply_to.is_empty() {
from.clone()
} else {
convert_addresses(&msg.reply_to)
},
from,
to: convert_addresses(&msg.to),
cc: convert_addresses(&msg.cc),
bcc: convert_addresses(&msg.bcc),
in_reply_to: NString(
msg.in_reply_to
.iter()
.next()
.map(|d| IString::try_from(d.to_string()).unwrap()),
),
message_id: NString(
msg.msg_id
.as_ref()
.map(|d| IString::try_from(d.to_string()).unwrap()),
),
}
}
fn convert_addresses(addrlist: &Vec<imf::address::AddressRef>) -> Vec<Address<'static>> {
let mut acc = vec![];
for item in addrlist {
match item {
imf::address::AddressRef::Single(a) => acc.push(convert_mbx(a)),
imf::address::AddressRef::Many(l) => acc.extend(l.participants.iter().map(convert_mbx)),
}
}
return acc;
}
fn convert_mbx(addr: &imf::mailbox::MailboxRef) -> Address<'static> {
Address {
name: NString(
addr.name
.as_ref()
.map(|x| IString::try_from(x.to_string()).unwrap()),
),
// SMTP at-domain-list (source route) seems obsolete since at least 1991
// https://www.mhonarc.org/archive/html/ietf-822/1991-06/msg00060.html
adl: NString(None),
mailbox: NString(Some(
IString::try_from(addr.addrspec.local_part.to_string()).unwrap(),
)),
host: NString(Some(
IString::try_from(addr.addrspec.domain.to_string()).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>(part: &AnyPart<'a>) -> Result<BodyStructure<'static>> {
match part {
AnyPart::Mult(x) => {
let itype = &x.mime.interpreted_type;
let subtype = IString::try_from(itype.subtype.to_string())
.unwrap_or(unchecked_istring("alternative"));
let inner_bodies = x
.children
.iter()
.filter_map(|inner| build_imap_email_struct(&inner).ok())
.collect::<Vec<_>>();
NonEmptyVec::validate(&inner_bodies)?;
let bodies = NonEmptyVec::unvalidated(inner_bodies);
Ok(BodyStructure::Multi {
bodies,
subtype,
extension_data: None,
/*Some(MultipartExtensionData {
parameter_list: vec![],
disposition: None,
language: None,
location: None,
extension: vec![],
})*/
})
}
AnyPart::Txt(x) => {
let mut basic = basic_fields(&x.mime.fields, x.body.len())?;
// Get the interpreted content type, set it
let itype = match &x.mime.interpreted_type {
Deductible::Inferred(v) | Deductible::Explicit(v) => v,
};
let subtype =
IString::try_from(itype.subtype.to_string()).unwrap_or(unchecked_istring("plain"));
// Add charset to the list of parameters if we know it has been inferred as it will be
// missing from the parsed content.
if let Deductible::Inferred(charset) = &itype.charset {
basic.parameter_list.push((
unchecked_istring("charset"),
IString::try_from(charset.to_string()).unwrap_or(unchecked_istring("us-ascii")),
));
}
Ok(BodyStructure::Single {
body: FetchBody {
basic,
specific: SpecificFields::Text {
subtype,
number_of_lines: nol(x.body),
},
},
extension_data: None,
})
}
AnyPart::Bin(x) => {
let basic = basic_fields(&x.mime.fields, x.body.len())?;
let default = mime::r#type::NaiveType {
main: &b"application"[..],
sub: &b"octet-stream"[..],
params: vec![],
};
let ct = x.mime.fields.ctype.as_ref().unwrap_or(&default);
let r#type =
IString::try_from(String::from_utf8_lossy(ct.main).to_string()).or(Err(
anyhow!("Unable to build IString from given Content-Type type given"),
))?;
let subtype =
IString::try_from(String::from_utf8_lossy(ct.sub).to_string()).or(Err(anyhow!(
"Unable to build IString from given Content-Type subtype given"
)))?;
Ok(BodyStructure::Single {
body: FetchBody {
basic,
specific: SpecificFields::Basic { r#type, subtype },
},
extension_data: None,
})
}
AnyPart::Msg(x) => {
let basic = basic_fields(&x.mime.fields, x.raw_part.len())?;
Ok(BodyStructure::Single {
body: FetchBody {
basic,
specific: SpecificFields::Message {
envelope: Box::new(message_envelope(&x.imf)),
body_structure: Box::new(build_imap_email_struct(x.child.as_ref())?),
number_of_lines: nol(x.raw_part),
},
},
extension_data: None,
})
}
}
}
fn nol(input: &[u8]) -> u32 {
input
.iter()
.filter(|x| **x == b'\n')
.count()
.try_into()
.unwrap_or(0)
}
/// s is set to static to ensure that only compile time values
/// checked by 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")
}
fn basic_fields(m: &mime::NaiveMIME, sz: usize) -> Result<BasicFields<'static>> {
let parameter_list = m
.ctype
.as_ref()
.map(|x| {
x.params
.iter()
.map(|p| {
(
IString::try_from(String::from_utf8_lossy(p.name).to_string()),
IString::try_from(p.value.to_string()),
)
})
.filter(|(k, v)| k.is_ok() && v.is_ok())
.map(|(k, v)| (k.unwrap(), v.unwrap()))
.collect()
})
.unwrap_or(vec![]);
Ok(BasicFields {
parameter_list,
id: NString(
m.id.as_ref()
.and_then(|ci| IString::try_from(ci.to_string()).ok()),
),
description: NString(
m.description
.as_ref()
.and_then(|cd| IString::try_from(cd.to_string()).ok()),
),
content_transfer_encoding: match m.transfer_encoding {
mime::mechanism::Mechanism::_8Bit => unchecked_istring("8bit"),
mime::mechanism::Mechanism::Binary => unchecked_istring("binary"),
mime::mechanism::Mechanism::QuotedPrintable => unchecked_istring("quoted-printable"),
mime::mechanism::Mechanism::Base64 => unchecked_istring("base64"),
_ => unchecked_istring("7bit"),
},
// @FIXME we can't compute the size of the message currently...
size: u32::try_from(sz)?,
})
}
/// Extract message section for section identifier passed by the FETCH BODY[<section>]<<partial>>
/// request
///
/// Example of message sections:
///
/// ```
/// HEADER ([RFC-2822] header of the message)
/// TEXT ([RFC-2822] text body of the message) MULTIPART/MIXED
/// 1 TEXT/PLAIN
/// 2 APPLICATION/OCTET-STREAM
/// 3 MESSAGE/RFC822
/// 3.HEADER ([RFC-2822] header of the message)
/// 3.TEXT ([RFC-2822] text body of the message) MULTIPART/MIXED
/// 3.1 TEXT/PLAIN
/// 3.2 APPLICATION/OCTET-STREAM
/// 4 MULTIPART/MIXED
/// 4.1 IMAGE/GIF
/// 4.1.MIME ([MIME-IMB] header for the IMAGE/GIF)
/// 4.2 MESSAGE/RFC822
/// 4.2.HEADER ([RFC-2822] header of the message)
/// 4.2.TEXT ([RFC-2822] text body of the message) MULTIPART/MIXED
/// 4.2.1 TEXT/PLAIN
/// 4.2.2 MULTIPART/ALTERNATIVE
/// 4.2.2.1 TEXT/PLAIN
/// 4.2.2.2 TEXT/RICHTEXT
/// ```
fn get_message_section<'a>(
parsed: &'a AnyPart<'a>,
section: &Option<FetchSection>,
) -> Result<Cow<'a, [u8]>> {
let msg = parsed
.as_message()
.ok_or(anyhow!("Part must be a message"))?;
match section {
Some(FetchSection::Text(None)) => Ok(msg.raw_body.into()),
Some(FetchSection::Text(Some(part))) => map_subpart(parsed, part.0.as_ref(), |part_msg| {
Ok(part_msg
.as_message()
.ok_or(Error::msg(
"Not a message/rfc822 part while expected by request (TEXT)",
))?
.raw_body
.into())
}),
Some(FetchSection::Header(part)) => map_subpart(
parsed,
part.as_ref().map(|p| p.0.as_ref()).unwrap_or(&[]),
|part_msg| {
Ok(part_msg
.as_message()
.ok_or(Error::msg(
"Not a message/rfc822 part while expected by request (HEADER)",
))?
.raw_headers
.into())
},
),
Some(
FetchSection::HeaderFields(part, fields) | FetchSection::HeaderFieldsNot(part, fields),
) => {
let invert = matches!(section, Some(FetchSection::HeaderFieldsNot(_, _)));
let fields = fields
.as_ref()
.iter()
.map(|x| match x {
AString::Atom(a) => a.inner().as_bytes(),
AString::String(IString::Literal(l)) => l.as_ref(),
AString::String(IString::Quoted(q)) => q.inner().as_bytes(),
})
.collect::<Vec<_>>();
map_subpart(
parsed,
part.as_ref().map(|p| p.0.as_ref()).unwrap_or(&[]),
|part_msg| {
let mut ret = vec![];
let mime = match &part_msg {
AnyPart::Msg(msg) => msg.child.mime(),
other => other.mime(),
};
for f in mime.kv.iter() {
let (k, v) = match f {
header::Field::Good(header::Kv2(k, v)) => (k, v),
_ => continue,
};
if fields.as_slice().iter().any(|x| (x == k) ^ invert) {
ret.extend(*k);
ret.extend(b": ");
ret.extend(*v);
ret.extend(b"\r\n");
}
}
ret.extend(b"\r\n");
Ok(ret.into())
},
)
}
Some(FetchSection::Part(part)) => map_subpart(parsed, part.0.as_ref(), |part| {
let bytes = match &part {
AnyPart::Txt(p) => p.body,
AnyPart::Bin(p) => p.body,
AnyPart::Msg(p) => p.raw_part,
AnyPart::Mult(_) => bail!("Multipart part has no body"),
};
Ok(bytes.to_vec().into())
}),
Some(FetchSection::Mime(part)) => map_subpart(parsed, part.0.as_ref(), |part| {
let bytes = match &part {
AnyPart::Txt(p) => p.mime.fields.raw,
AnyPart::Bin(p) => p.mime.fields.raw,
AnyPart::Msg(p) => p.child.mime().raw,
AnyPart::Mult(p) => p.mime.fields.raw,
};
Ok(bytes.to_vec().into())
}),
None => Ok(msg.raw_part.into()),
}
}
/// Fetch a MIME SubPart
///
/// eg. FETCH BODY[4.2.2.1] -> [4, 2, 2, 1]
fn map_subpart<'a, F, R>(part: &AnyPart<'a>, path: &[NonZeroU32], f: F) -> Result<R>
where
F: FnOnce(&AnyPart<'a>) -> Result<R>,
{
if path.is_empty() {
f(part)
} else {
match part {
AnyPart::Mult(x) => map_subpart(
x.children
.get(path[0].get() as usize - 1)
.ok_or(anyhow!("Unable to resolve subpath {:?}, current multipart has only {} elements", path, x.children.len()))?,
&path[1..],
f),
AnyPart::Msg(x) => map_subpart(x.child.as_ref(), path, f),
_ => bail!("You tried to access a subpart on an atomic part (text or binary). Unresolved subpath {:?}", path),
}
impl MailIdentifiersList {
fn uuids(&self) -> Vec<UniqueIdent> {
self.0.iter().map(|mi| mi.uuid).collect()
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::cryptoblob;
use crate::mail::unique_ident;
use imap_codec::imap_types::fetch::{
MacroOrMessageDataItemNames, MessageDataItemName,
};
use imap_codec::encode::Encoder;
use imap_codec::imap_types::core::NonEmptyVec;
use imap_codec::imap_types::fetch::Section;
use imap_codec::imap_types::response::Response;
use imap_codec::ResponseCodec;
use std::fs;
use crate::cryptoblob;
use crate::mail::unique_ident;
use crate::mail::mailbox::MailMeta;
use crate::imap::mail_view::{MailView, FetchedMail};
use crate::imap::mime_view;
#[test]
fn mailview_body_ext() -> Result<()> {
let ap = AttributesProxy::new(
@ -1452,7 +655,7 @@ mod tests {
let test_repr = Response::Data(Data::Fetch {
seq: NonZeroU32::new(1).unwrap(),
items: NonEmptyVec::from(MessageDataItem::Body(build_imap_email_struct(
items: NonEmptyVec::from(MessageDataItem::Body(mime_view::bodystructure(
&message.child,
)?)),
});
@ -1470,3 +673,4 @@ mod tests {
Ok(())
}
}

292
src/imap/mime_view.rs
View File

@ -1,292 +0,0 @@
use std::borrow::Cow;
use std::num::NonZeroU32;
use std::collections::HashSet;
use anyhow::{anyhow, bail, Result};
use imap_codec::imap_types::core::{AString, IString, NonEmptyVec};
use imap_codec::imap_types::fetch::{
Section as FetchSection, Part as FetchPart
};
use eml_codec::{
header, part::AnyPart,
};
pub enum BodySection<'a> {
Full(Cow<'a, [u8]>),
Slice {
body: Cow<'a, [u8]>,
origin_octet: u32,
},
}
/// Logic for BODY[<section>]<<partial>>
/// Works in 3 times:
/// 1. Find the section (RootMime::subset)
/// 2. Apply the extraction logic (SelectedMime::extract), like TEXT, HEADERS, etc.
/// 3. Keep only the given subset provided by partial
pub fn body_ext<'a>(
part: &'a AnyPart<'a>,
section: &Option<FetchSection>,
partial: &Option<(u32, NonZeroU32)>
) -> Result<Cow<'a, [u8]>> {
let root_mime = RootMime(part);
let (extractor, path) = SubsettedSection::from(section);
let selected_mime = root_mime.subset(path);
unimplemented!();
}
/// RootMime
///
/// Example of message sections:
///
/// ```
/// HEADER ([RFC-2822] header of the message)
/// TEXT ([RFC-2822] text body of the message) MULTIPART/MIXED
/// 1 TEXT/PLAIN
/// 2 APPLICATION/OCTET-STREAM
/// 3 MESSAGE/RFC822
/// 3.HEADER ([RFC-2822] header of the message)
/// 3.TEXT ([RFC-2822] text body of the message) MULTIPART/MIXED
/// 3.1 TEXT/PLAIN
/// 3.2 APPLICATION/OCTET-STREAM
/// 4 MULTIPART/MIXED
/// 4.1 IMAGE/GIF
/// 4.1.MIME ([MIME-IMB] header for the IMAGE/GIF)
/// 4.2 MESSAGE/RFC822
/// 4.2.HEADER ([RFC-2822] header of the message)
/// 4.2.TEXT ([RFC-2822] text body of the message) MULTIPART/MIXED
/// 4.2.1 TEXT/PLAIN
/// 4.2.2 MULTIPART/ALTERNATIVE
/// 4.2.2.1 TEXT/PLAIN
/// 4.2.2.2 TEXT/RICHTEXT
/// ```
struct RootMime<'a>(&'a AnyPart<'a>);
impl<'a> RootMime<'a> {
/// A MIME object is a tree of elements.
/// The path indicates which element must be picked.
/// This function returns the picked element as the new view
fn subset(&self, path: Option<&FetchPart>) -> Result<SelectedMime> {
match path {
None => Ok(SelectedMime(self.0)),
Some(v) => self.rec_subset(v.0.as_ref()),
}
}
fn rec_subset(self, path: &[NonZeroU32]) -> Result<SelectedMime> {
if path.is_empty() {
Ok(SelectedMime(self.0))
} else {
match self.0 {
AnyPart::Mult(x) => {
let next = Self(x.children
.get(path[0].get() as usize - 1)
.ok_or(anyhow!("Unable to resolve subpath {:?}, current multipart has only {} elements", path, x.children.len()))?);
next.rec_subset(&path[1..])
},
AnyPart::Msg(x) => {
let next = Self(x.child.as_ref());
next.rec_subset(path)
},
_ => bail!("You tried to access a subpart on an atomic part (text or binary). Unresolved subpath {:?}", path),
}
}
}
}
//----------------------------------------------------------
/// A FetchSection must be handled in 2 times:
/// - First we must extract the MIME part
/// - Then we must process it as desired
/// The given struct mixes both work, so
/// we separate this work here.
enum SubsettedSection<'a> {
Part,
Header,
HeaderFields(&'a NonEmptyVec<AString<'a>>),
HeaderFieldsNot(&'a NonEmptyVec<AString<'a>>),
Text,
Mime,
}
impl<'a> SubsettedSection<'a> {
fn from(section: &'a Option<FetchSection>) -> (Self, Option<&'a FetchPart>) {
match section {
Some(FetchSection::Text(maybe_part)) => (Self::Text, maybe_part.as_ref()),
Some(FetchSection::Header(maybe_part)) => (Self::Header, maybe_part.as_ref()),
Some(FetchSection::HeaderFields(maybe_part, fields)) => (Self::HeaderFields(fields), maybe_part.as_ref()),
Some(FetchSection::HeaderFieldsNot(maybe_part, fields)) => (Self::HeaderFieldsNot(fields), maybe_part.as_ref()),
Some(FetchSection::Text(maybe_part)) => (Self::Text, maybe_part.as_ref()),
Some(FetchSection::Mime(part)) => (Self::Mime, Some(part)),
Some(FetchSection::Part(part)) => (Self::Part, Some(part)),
None => (Self::Part, None),
}
}
}
struct SelectedMime<'a>(&'a AnyPart<'a>);
impl<'a> SelectedMime<'a> {
/// The subsetted fetch section basically tells us the
/// extraction logic to apply on our selected MIME.
/// This function acts as a router for these logic.
fn extract(&self, extractor: &SubsettedSection) -> Result<ExtractedFull<'a>> {
match extractor {
SubsettedSection::Text => self.text(),
SubsettedSection::Header => self.header(),
SubsettedSection::HeaderFields(fields) => self.header_fields(fields, false),
SubsettedSection::HeaderFieldsNot(fields) => self.header_fields(fields, true),
SubsettedSection::Part => self.part(),
SubsettedSection::Mime => self.mime(),
}
}
fn mime(&self) -> Result<ExtractedFull<'a>> {
let bytes = match &self.0 {
AnyPart::Txt(p) => p.mime.fields.raw,
AnyPart::Bin(p) => p.mime.fields.raw,
AnyPart::Msg(p) => p.child.mime().raw,
AnyPart::Mult(p) => p.mime.fields.raw,
};
Ok(ExtractedFull(bytes.to_vec().into()))
}
fn part(&self) -> Result<ExtractedFull<'a>> {
let bytes = match &self.0 {
AnyPart::Txt(p) => p.body,
AnyPart::Bin(p) => p.body,
AnyPart::Msg(p) => p.raw_part,
AnyPart::Mult(_) => bail!("Multipart part has no body"),
};
Ok(ExtractedFull(bytes.to_vec().into()))
}
/// The [...] HEADER.FIELDS, and HEADER.FIELDS.NOT part
/// specifiers refer to the [RFC-2822] header of the message or of
/// an encapsulated [MIME-IMT] MESSAGE/RFC822 message.
/// HEADER.FIELDS and HEADER.FIELDS.NOT are followed by a list of
/// field-name (as defined in [RFC-2822]) names, and return a
/// subset of the header. The subset returned by HEADER.FIELDS
/// contains only those header fields with a field-name that
/// matches one of the names in the list; similarly, the subset
/// returned by HEADER.FIELDS.NOT contains only the header fields
/// with a non-matching field-name. The field-matching is
/// case-insensitive but otherwise exact.
fn header_fields(&self, fields: &'a NonEmptyVec<AString<'a>>, invert: bool) -> Result<ExtractedFull<'a>> {
// Build a lowercase ascii hashset with the fields to fetch
let index = fields
.as_ref()
.iter()
.map(|x| match x {
AString::Atom(a) => a.inner().as_bytes(),
AString::String(IString::Literal(l)) => l.as_ref(),
AString::String(IString::Quoted(q)) => q.inner().as_bytes(),
}.to_ascii_lowercase())
.collect::<HashSet<_>>();
// Extract MIME headers
let mime = match &self.0 {
AnyPart::Msg(msg) => msg.child.mime(),
other => other.mime(),
};
// Filter our MIME headers based on the field index
// 1. Keep only the correctly formatted headers
// 2. Keep only based on the index presence or absence
// 3. Reduce as a byte vector
let buffer = mime.kv.iter()
.filter_map(|field| match field {
header::Field::Good(header::Kv2(k, v)) => Some((k, v)),
_ => None,
})
.filter(|(k, _)| index.contains(&k.to_ascii_lowercase()) ^ invert)
.fold(vec![], |mut acc, (k, v)| {
acc.extend(*k);
acc.extend(b": ");
acc.extend(*v);
acc.extend(b"\r\n");
acc
});
Ok(ExtractedFull(buffer.into()))
}
/// The HEADER [...] part specifiers refer to the [RFC-2822] header of the message or of
/// an encapsulated [MIME-IMT] MESSAGE/RFC822 message.
/// ```raw
/// HEADER ([RFC-2822] header of the message)
/// ```
fn header(&self) -> Result<ExtractedFull<'a>> {
let msg = self.0.as_message().ok_or(anyhow!("Selected part must be a message/rfc822"))?;
Ok(ExtractedFull(msg.raw_headers.into()))
}
/// The TEXT part specifier refers to the text body of the message, omitting the [RFC-2822] header.
fn text(&self) -> Result<ExtractedFull<'a>> {
let msg = self.0.as_message().ok_or(anyhow!("Selected part must be a message/rfc822"))?;
Ok(ExtractedFull(msg.raw_body.into()))
}
}
// ---------------------------
struct ExtractedFull<'a>(Cow<'a, [u8]>);
impl<'a> ExtractedFull<'a> {
/// It is possible to fetch a substring of the designated text.
/// This is done by appending an open angle bracket ("<"), the
/// octet position of the first desired octet, a period, the
/// maximum number of octets desired, and a close angle bracket
/// (">") to the part specifier. If the starting octet is beyond
/// the end of the text, an empty string is returned.
///
/// Any partial fetch that attempts to read beyond the end of the
/// text is truncated as appropriate. A partial fetch that starts
/// at octet 0 is returned as a partial fetch, even if this
/// truncation happened.
///
/// Note: This means that BODY[]<0.2048> of a 1500-octet message
/// will return BODY[]<0> with a literal of size 1500, not
/// BODY[].
///
/// Note: A substring fetch of a HEADER.FIELDS or
/// HEADER.FIELDS.NOT part specifier is calculated after
/// subsetting the header.
fn to_body_section(&self, partial: &'_ Option<(u32, NonZeroU32)>) -> BodySection<'a> {
match partial {
Some((begin, len)) => self.partialize(*begin, *len),
None => BodySection::Full(self.0),
}
}
fn partialize(&self, begin: u32, len: NonZeroU32) -> BodySection<'a> {
// Asked range is starting after the end of the content,
// returning an empty buffer
if begin as usize > self.0.len() {
return BodySection::Slice {
body: Cow::Borrowed(&[][..]),
origin_octet: begin,
}
}
// Asked range is ending after the end of the content,
// slice only the beginning of the buffer
if (begin + len.get()) as usize >= self.0.len() {
return BodySection::Slice {
body: Cow::Borrowed(&self.0[begin as usize..]),
origin_octet: begin,
}
}
// Range is included inside the considered content,
// this is the "happy case"
BodySection::Slice {
body: Cow::Borrowed(&self.0[begin as usize..(begin + len.get()) as usize]),
origin_octet: begin,
}
}
}

6
src/imap/mod.rs
View File

@ -1,7 +1,13 @@
mod capability;
mod command;
mod flow;
mod attributes;
mod mail_view;
mod mailbox_view;
mod mime_view;
mod imf_view;
mod selectors;
mod flags;
mod response;
mod session;

103
src/imap/selectors.rs Normal file
View File

@ -0,0 +1,103 @@
use std::iter::zip;
use anyhow::{anyhow, Result};
use crate::cryptoblob::Key;
use crate::imap::mail_view::{MailView, FetchedMail};
use crate::imap::mailbox_view::MailIdentifiers;
use crate::mail::mailbox::MailMeta;
use crate::mail::unique_ident::UniqueIdent;
pub struct BodyIdentifier<'a> {
pub msg_uuid: &'a UniqueIdent,
pub msg_key: &'a Key,
}
#[derive(Default)]
pub struct MailSelectionBuilder<'a> {
//attrs: AttributeProxy,
mail_count: usize,
need_body: bool,
mi: &'a [MailIdentifiers],
meta: &'a [MailMeta],
flags: &'a [&'a Vec<String>],
bodies: &'a [Vec<u8>],
}
impl<'a> MailSelectionBuilder<'a> {
pub fn new(need_body: bool, mail_count: usize) -> Self {
Self {
mail_count,
need_body,
..MailSelectionBuilder::default()
}
}
pub fn with_mail_identifiers(&mut self, mi: &'a [MailIdentifiers]) -> &mut Self {
self.mi = mi;
self
}
pub fn with_metadata(&mut self, meta: &'a [MailMeta]) -> &mut Self {
self.meta = meta;
self
}
pub fn with_flags(&mut self, flags: &'a [&'a Vec<String>]) -> &mut Self {
self.flags = flags;
self
}
pub fn bodies_to_collect(&self) -> Vec<BodyIdentifier> {
if !self.need_body {
return vec![];
}
zip(self.mi, self.meta)
.map(|(mi, meta)| BodyIdentifier {
msg_uuid: &mi.uuid,
msg_key: &meta.message_key,
})
.collect::<Vec<_>>()
}
pub fn with_bodies(&mut self, rbodies: &'a [Vec<u8>]) -> &mut Self {
self.bodies = rbodies;
self
}
pub fn build(&self) -> Result<Vec<MailView<'a>>> {
let mut bodies = vec![];
if !self.need_body {
for m in self.meta.iter() {
let (_, hdrs) =
eml_codec::parse_imf(&m.headers).or(Err(anyhow!("Invalid mail headers")))?;
bodies.push(FetchedMail::Partial(hdrs));
}
} else {
for rb in self.bodies.iter() {
let (_, p) = eml_codec::parse_message(&rb).or(Err(anyhow!("Invalid mail body")))?;
bodies.push(FetchedMail::new_from_message(p));
}
}
if self.mi.len() != self.mail_count && self.meta.len() != self.mail_count
|| self.flags.len() != self.mail_count
|| bodies.len() != self.mail_count
{
return Err(anyhow!("Can't build a mail view selection as parts were not correctly registered into the builder."));
}
Ok(zip(self.mi, zip(self.meta, zip(self.flags, bodies)))
.map(|(ids, (meta, (flags, content)))| MailView {
ids,
meta,
flags,
content,
})
.collect())
}
}