X-Git-Url: http://git.bitcoin.ninja/index.cgi?a=blobdiff_plain;f=lightning%2Fsrc%2Fln%2Fchan_utils.rs;h=51a2c4b042224464eacbfe5781c9ed36325b992e;hb=c9916437468a130718ab83baa2f346b301b674ba;hp=aa212b2d2d2d4920b3bc1860449c6aa6f0f8d13d;hpb=b65035f5e9fcb2b5953e6c87451b6f7064db537b;p=rust-lightning

diff --git a/lightning/src/ln/chan_utils.rs b/lightning/src/ln/chan_utils.rs
index aa212b2d..51a2c4b0 100644
--- a/lightning/src/ln/chan_utils.rs
+++ b/lightning/src/ln/chan_utils.rs
@@ -18,13 +18,32 @@ use ln::channelmanager::{PaymentHash, PaymentPreimage};
 use ln::msgs::DecodeError;
 use util::ser::{Readable, Writeable, Writer, WriterWriteAdaptor};
 
-use secp256k1::key::{SecretKey,PublicKey};
+use secp256k1::key::{SecretKey, PublicKey};
 use secp256k1::{Secp256k1, Signature};
 use secp256k1;
 
 pub(super) const HTLC_SUCCESS_TX_WEIGHT: u64 = 703;
 pub(super) const HTLC_TIMEOUT_TX_WEIGHT: u64 = 663;
 
+#[derive(PartialEq)]
+pub(crate) enum HTLCType {
+	AcceptedHTLC,
+	OfferedHTLC
+}
+
+impl HTLCType {
+	/// Check if a given tx witnessScript len matchs one of a pre-signed HTLC
+	pub(crate) fn scriptlen_to_htlctype(witness_script_len: usize) ->  Option<HTLCType> {
+		if witness_script_len == 133 {
+			Some(HTLCType::OfferedHTLC)
+		} else if witness_script_len >= 136 && witness_script_len <= 139 {
+			Some(HTLCType::AcceptedHTLC)
+		} else {
+			None
+		}
+	}
+}
+
 // Various functions for key derivation and transaction creation for use within channels. Primarily
 // used in Channel and ChannelMonitor.