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use std::io;
use std::path::Path;
use crate::{
Result,
Packet,
PacketPile,
};
use crate::parse::{
PacketParserBuilder,
PacketParserResult,
PacketParser,
Parse,
Cookie
};
use buffered_reader::BufferedReader;
/// A `PacketPileParser` parses an OpenPGP message with the convenience
/// of `PacketPile::from_file` and the flexibility of a `PacketParser`.
///
/// Like `PacketPile::from_file` (and unlike `PacketParser`), a
/// `PacketPileParser` parses an OpenPGP message and returns a `PacketPile`.
/// But, unlike `PacketPile::from_file` (and like `PacketParser`), it
/// allows the caller to inspect each packet as it is being parsed.
///
/// Thus, using a `PacketPileParser`, it is possible to decide on a
/// per-packet basis whether to stream, buffer or drop the packet's
/// body, whether to recurse into a container, or whether to abort
/// processing, for example. And, `PacketPileParser` conveniently packs
/// the packets into a `PacketPile`.
///
/// If old packets don't need to be retained, then `PacketParser`
/// should be preferred. If no per-packet processing needs to be
/// done, then `PacketPile::from_file` will be slightly faster.
///
/// # Examples
///
/// ```rust
/// # extern crate sequoia_openpgp as openpgp;
/// # use openpgp::Result;
/// # use openpgp::parse::{Parse, PacketPileParser};
/// # let _ = f(include_bytes!("../../tests/data/keys/public-key.gpg"));
/// #
/// # fn f(message_data: &[u8]) -> Result<()> {
/// let mut ppp = PacketPileParser::from_bytes(message_data)?;
/// let mut ppr = ppp.recurse()?;
/// while let Some(pp) = ppr.as_ref() {
/// eprintln!("{:?}", pp);
/// ppr = ppp.recurse()?;
/// }
/// let message = ppp.finish();
/// message.pretty_print();
/// # Ok(())
/// # }
/// ```
#[derive(Debug)]
pub struct PacketPileParser<'a> {
/// The current packet.
ppr: PacketParserResult<'a>,
/// Whether the first packet has been returned.
returned_first: bool,
/// The packet pile that has been assembled so far.
pile: PacketPile,
}
impl<'a> PacketParserBuilder<'a> {
/// Finishes configuring the `PacketParser` and returns a
/// `PacketPileParser`.
pub fn into_packet_pile_parser(self) -> Result<PacketPileParser<'a>>
where Self: 'a {
PacketPileParser::from_packet_parser(self.finalize()?)
}
}
impl<'a> Parse<'a, PacketPileParser<'a>> for PacketPileParser<'a> {
/// Creates a `PacketPileParser` to parse the OpenPGP message stored
/// in the `io::Read` object.
fn from_reader<R: io::Read + 'a>(reader: R)
-> Result<PacketPileParser<'a>> {
let bio = Box::new(buffered_reader::Generic::with_cookie(
reader, None, Cookie::default()));
PacketPileParser::from_buffered_reader(bio)
}
/// Creates a `PacketPileParser` to parse the OpenPGP message stored
/// in the file named by `path`.
fn from_file<P: AsRef<Path>>(path: P)
-> Result<PacketPileParser<'a>> {
PacketPileParser::from_buffered_reader(
Box::new(buffered_reader::File::with_cookie(path, Cookie::default())?))
}
/// Creates a `PacketPileParser` to parse the OpenPGP message stored
/// in the provided buffer.
fn from_bytes<D: AsRef<[u8]> + ?Sized>(data: &'a D)
-> Result<PacketPileParser<'a>> {
let bio = Box::new(buffered_reader::Memory::with_cookie(
data.as_ref(), Cookie::default()));
PacketPileParser::from_buffered_reader(bio)
}
}
impl<'a> PacketPileParser<'a> {
/// Creates a `PacketPileParser` from a *fresh* `PacketParser`.
fn from_packet_parser(ppr: PacketParserResult<'a>)
-> Result<PacketPileParser<'a>>
{
Ok(PacketPileParser {
pile: PacketPile { top_level: Default::default() },
ppr: ppr,
returned_first: false,
})
}
/// Creates a `PacketPileParser` to parse the OpenPGP message stored
/// in the `BufferedReader` object.
pub(crate) fn from_buffered_reader(bio: Box<dyn BufferedReader<Cookie> + 'a>)
-> Result<PacketPileParser<'a>> {
Self::from_packet_parser(PacketParser::from_buffered_reader(bio)?)
}
/// Inserts the next packet into the `PacketPile`.
fn insert_packet(&mut self, packet: Packet, position: isize) {
// Find the right container.
let mut container = &mut self.pile.top_level;
assert!(position >= 0);
for i in 0..position {
// The most recent child.
let tmp = container;
let packets_len = tmp.packets.len();
let p = &mut tmp.packets[packets_len - 1];
if p.children().next().is_none() {
assert!(i == position - 1,
"Internal inconsistency while building message.");
}
container = p.container_mut().unwrap();
}
container.packets.push(packet);
}
/// Finishes parsing the current packet and starts parsing the
/// next one. This function recurses, if possible.
///
/// This function finishes parsing the current packet. By
/// default, any unread content is dropped. It then creates a new
/// packet parser for the next packet. If the current packet is a
/// container, this function tries to recurse into it. Otherwise,
/// it returns the following packet.
pub fn recurse(&mut self) -> Result<&mut PacketParserResult<'a>> {
if self.returned_first {
match self.ppr.take() {
PacketParserResult::Some(pp) => {
let (packet, ppr) = pp.recurse()?;
self.insert_packet(
packet,
ppr.last_recursion_depth().unwrap() as isize);
self.ppr = ppr;
}
eof @ PacketParserResult::EOF(_) => {
self.ppr = eof;
}
}
} else {
self.returned_first = true;
}
Ok(&mut self.ppr)
}
/// Finishes parsing the current packet and starts parsing the
/// next one. This function does not recurse.
///
/// This function finishes parsing the current packet. By
/// default, any unread content is dropped. It then creates a new
/// packet parser for the following packet. If the current packet
/// is a container, this function does *not* recurse into the
/// container; it skips any packets that it may contain.
pub fn next(&mut self) -> Result<&mut PacketParserResult<'a>> {
if self.returned_first {
match self.ppr.take() {
PacketParserResult::Some(pp) => {
let (packet, ppr) = pp.next()?;
self.insert_packet(
packet,
ppr.last_recursion_depth().unwrap() as isize);
self.ppr = ppr;
},
eof @ PacketParserResult::EOF(_) => {
self.ppr = eof
},
}
} else {
self.returned_first = true;
}
Ok(&mut self.ppr)
}
/// Returns the current packet's recursion depth.
///
/// A top-level packet has a recursion depth of 0. Packets in a
/// top-level container have a recursion depth of 1. Etc.
pub fn recursion_depth(&self) -> Option<u8> {
if let PacketParserResult::Some(ref pp) = self.ppr {
Some(pp.recursion_depth() as u8)
} else {
None
}
}
/// Returns whether the message has been completely parsed.
pub fn is_done(&self) -> bool {
self.ppr.is_none()
}
/// Finishes parsing the message and returns the assembled
/// `PacketPile`.
///
/// This function can be called at any time, not only when the
/// message has been completely parsed. If the packet sequence has not
/// been completely parsed, this function aborts processing, and
/// the returned `PacketPile` just contains those packets that were
/// completely processed; the packet that is currently being
/// processed is not included in th
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