X-Git-Url: http://git.bitcoin.ninja/index.cgi?a=blobdiff_plain;f=lightning%2Fsrc%2Foffers%2Fparse.rs;h=0b3dda7928593871f8007c5ff50d2d081366dac8;hb=5e14c24a11f610ab8c402f788ec5bd637e9e24af;hp=c9d568a9007aa09c6b90740f0c3ad75ed28ecd85;hpb=60d7ffce10a322ed5c6d93d23c6657ebdd87d389;p=rust-lightning

diff --git a/lightning/src/offers/parse.rs b/lightning/src/offers/parse.rs
index c9d568a9..0b3dda79 100644
--- a/lightning/src/offers/parse.rs
+++ b/lightning/src/offers/parse.rs
@@ -11,14 +11,17 @@
 
 use bitcoin::bech32;
 use bitcoin::bech32::{FromBase32, ToBase32};
+use bitcoin::secp256k1;
 use core::convert::TryFrom;
 use core::fmt;
+use crate::io;
 use crate::ln::msgs::DecodeError;
+use crate::util::ser::SeekReadable;
 
 use crate::prelude::*;
 
 /// Indicates a message can be encoded using bech32.
-pub(crate) trait Bech32Encode: AsRef<[u8]> + TryFrom<Vec<u8>, Error=ParseError> {
+pub(super) trait Bech32Encode: AsRef<[u8]> + TryFrom<Vec<u8>, Error=ParseError> {
 	/// Human readable part of the message's bech32 encoding.
 	const BECH32_HRP: &'static str;
 
@@ -74,6 +77,30 @@ impl<'a> AsRef<str> for Bech32String<'a> {
 	}
 }
 
+/// A wrapper for reading a message as a TLV stream `T` from a byte sequence, while still
+/// maintaining ownership of the bytes for later use.
+pub(super) struct ParsedMessage<T: SeekReadable> {
+	pub bytes: Vec<u8>,
+	pub tlv_stream: T,
+}
+
+impl<T: SeekReadable> TryFrom<Vec<u8>> for ParsedMessage<T> {
+	type Error = DecodeError;
+
+	fn try_from(bytes: Vec<u8>) -> Result<Self, Self::Error> {
+		let mut cursor = io::Cursor::new(bytes);
+		let tlv_stream: T = SeekReadable::read(&mut cursor)?;
+
+		// Ensure that there are no more TLV records left to parse.
+		if cursor.position() < cursor.get_ref().len() as u64 {
+			return Err(DecodeError::InvalidValue);
+		}
+
+		let bytes = cursor.into_inner();
+		Ok(Self { bytes, tlv_stream })
+	}
+}
+
 /// Error when parsing a bech32 encoded message using [`str::parse`].
 #[derive(Debug, PartialEq)]
 pub enum ParseError {
@@ -89,21 +116,41 @@ pub enum ParseError {
 	Decode(DecodeError),
 	/// The parsed message has invalid semantics.
 	InvalidSemantics(SemanticError),
+	/// The parsed message has an invalid signature.
+	InvalidSignature(secp256k1::Error),
 }
 
 /// Error when interpreting a TLV stream as a specific type.
 #[derive(Debug, PartialEq)]
 pub enum SemanticError {
+	/// The current [`std::time::SystemTime`] is past the offer or invoice's expiration.
+	AlreadyExpired,
+	/// The provided chain hash does not correspond to a supported chain.
+	UnsupportedChain,
 	/// An amount was expected but was missing.
 	MissingAmount,
 	/// The amount exceeded the total bitcoin supply.
 	InvalidAmount,
+	/// An amount was provided but was not sufficient in value.
+	InsufficientAmount,
+	/// A currency was provided that is not supported.
+	UnsupportedCurrency,
+	/// A feature was required but is unknown.
+	UnknownRequiredFeatures,
 	/// A required description was not provided.
 	MissingDescription,
 	/// A signing pubkey was not provided.
 	MissingSigningPubkey,
+	/// A quantity was expected but was missing.
+	MissingQuantity,
 	/// An unsupported quantity was provided.
 	InvalidQuantity,
+	/// A quantity or quantity bounds was provided but was not expected.
+	UnexpectedQuantity,
+	/// Payer metadata was expected but was missing.
+	MissingPayerMetadata,
+	/// A payer id was expected but was missing.
+	MissingPayerId,
 }
 
 impl From<bech32::Error> for ParseError {
@@ -123,3 +170,9 @@ impl From<SemanticError> for ParseError {
 		Self::InvalidSemantics(error)
 	}
 }
+
+impl From<secp256k1::Error> for ParseError {
+	fn from(error: secp256k1::Error) -> Self {
+		Self::InvalidSignature(error)
+	}
+}