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/// This macro generates the parsers matching to the two different types of keys,
/// public and secret.
#[macro_export]
macro_rules! key_parser {
( $key_type:ty, $key_type_parser: ident, $key_tag:expr, $inner_key_type:ty, $( ($subkey_tag:ident, $inner_subkey_type:ty, $subkey_type:ty, $subkey_container:ident) ),* ) => {
/// Parse a transferable keys from the given packets.
/// Ref: https://tools.ietf.org/html/rfc4880.html#section-11.1
pub struct $key_type_parser<I: Sized + Iterator<Item = $crate::errors::Result<$crate::packet::Packet>>> {
inner: std::iter::Peekable<I>,
}
impl<I: Sized + Iterator<Item = $crate::errors::Result<$crate::packet::Packet>>> $key_type_parser<I> {
pub fn into_inner(self) -> std::iter::Peekable<I> {
self.inner
}
pub fn from_packets (
packets: std::iter::Peekable<I>,
) -> Self {
$key_type_parser {
inner: packets,
}
}
}
impl<I: Sized + Iterator<Item = $crate::errors::Result<$crate::packet::Packet>>> Iterator for $key_type_parser<I> {
type Item = $crate::errors::Result<$key_type>;
fn next(&mut self) -> Option<Self::Item> {
use std::convert::TryInto;
use $crate::packet::{self, Signature, SignatureType, UserAttribute, UserId};
use $crate::types::{KeyVersion, SignedUser, SignedUserAttribute, Tag, KeyTrait};
let packets = self.inner.by_ref();
// Check if we are done
packets.peek()?;
// -- One Public-Key packet
// ignore random other packets until we find something useful
while let Some(packet) = packets.next_if(|p| {
p.as_ref().is_ok_and(|p| p.tag() != $key_tag)
}) {
match packet {
Ok(p) => {
warn!("ignoring unexpected packet: expected {:?}, got {:?}", $key_tag, p.tag());
// FIXME: return error?
},
Err(e) => return Some(Err(e)),
}
}
let next = match packets.next() {
Some(Ok(n)) => n,
Some(Err(e)) => return Some(Err(e)),
None => return None,
};
let primary_key: $inner_key_type = err_opt!(next.try_into());
debug!("primary key: {:?}", primary_key.key_id());
// -- Zero or more revocation signatures
// -- followed by zero or more direct signatures in V4 keys
debug!(" signatures");
let mut revocation_signatures = Vec::new();
let mut direct_signatures = Vec::new();
while let Some(packet) = packets.next_if(|p| {
p.as_ref().is_ok_and(|p| p.tag() == Tag::Signature)
}) {
match packet {
Ok(packet) => {
debug!("parsing signature {:?}", packet.tag());
let sig: Signature = err_opt!(packet.try_into());
let typ = sig.typ();
if typ == SignatureType::KeyRevocation {
revocation_signatures.push(sig);
} else {
if primary_key.version() != KeyVersion::V4 {
// no direct signatures on V2|V3 keys
warn!("unexpected signature: {:?}", typ);
}
direct_signatures.push(sig);
}
},
Err(e) => return Some(Err(e)),
}
}
// -- Zero or more User ID packets
// -- Zero or more User Attribute packets
debug!(" user");
let mut users = Vec::new();
let mut user_attributes = Vec::new();
while let Some(packet) = packets.next_if(|p| {
p.as_ref().is_ok_and(|p| {
debug!("peek {:?}", p.tag());
p.tag() == Tag::UserId || p.tag() == Tag::UserAttribute
})
}) {
let packet = match packet {
Ok(packet) => packet,
Err(err) => return Some(Err(err)),
};
let tag = packet.tag();
debug!(" user data: {:?}", tag);
match tag {
Tag::UserId => {
let id: UserId = err_opt!(packet.try_into());
// --- zero or more signature packets
let mut sigs = Vec::new();
while let Some(res) = packets.next_if(|p| {
p.as_ref().is_ok_and(|p| p.tag() == Tag::Signature)
}) {
let packet = match res {
Ok(packet) => packet,
Err(e) => return Some(Err(e)),
};
let sig: Signature = err_opt!(packet.try_into());
sigs.push(sig);
}
users.push(SignedUser::new(id, sigs));
}
Tag::UserAttribute => {
let attr: UserAttribute = err_opt!(packet.try_into());
// --- zero or more signature packets
let mut sigs = Vec::new();
while let Some(res) = packets.next_if(|p| {
p.as_ref().is_ok_and(|p| p.tag() == Tag::Signature)
}) {
let packet = match res {
Ok(packet) => packet,
Err(e) => return Some(Err(e)),
};
let sig: Signature = err_opt!(packet.try_into());
sigs.push(sig);
}
user_attributes.push(SignedUserAttribute::new(attr, sigs));
}
_ => break,
}
}
if users.is_empty() {
warn!("missing user ids");
}
// -- Zero or more Subkey packets
$(
let mut $subkey_container = vec![];
)*
debug!(" subkeys");
while let Some(res) = packets.next_if(|p|
p.as_ref().is_ok_and(|p| {
debug!(" peek {:?}", p.tag());
$( p.tag() == Tag::$subkey_tag || )* false
}
)) {
// -- Only V4 keys should have sub keys
if primary_key.version() != KeyVersion::V4 {
return Some(Err(format_err!("only V4 keys can have subkeys")));
}
let packet = match res {
Ok(packet) => packet,
Err(e) => return Some(Err(e)),
};
match packet.tag() {
$(
Tag::$subkey_tag => {
let subkey: $inner_subkey_type = err_opt!(packet.try_into());
let mut sigs = Vec::new();
while let Some(res) = packets.next_if(|packet| {
packet.is_ok() && packet.as_ref().unwrap().tag() == Tag::Signature
}) {
match res {
Ok(packet) => {
let sig: Signature = err_opt!(packet.try_into());
sigs.push(sig);
}
Err(e) => return Some(Err(e)),
}
}
$subkey_container.push(<$subkey_type>::new(subkey, sigs));
}
)*
_ => unreachable!()
}
}
Some(Ok(<$key_type>::new(
primary_key,
$crate::composed::signed_key::SignedKeyDetails::new(
revocation_signatures,
direct_signatures,
users,
user_attributes,
),
$( $subkey_container, )*
)))
}
}
impl $crate::composed::Deserializable for $key_type {
/// Parse a transferable key from packets.
/// Ref: https://tools.ietf.org/html/rfc4880.html#section-11.1
fn from_packets<'a, I: Iterator<Item = $crate::errors::Result<$crate::packet::Packet>> + 'a> (
packets: std::iter::Peekable<I>,
) -> Box<dyn Iterator<Item = $crate::errors::Result<Self>> + 'a> {
Box::new($key_type_parser::from_packets(packets))
}
}
};
}