X-Git-Url: http://git.bitcoin.ninja/index.cgi?a=blobdiff_plain;f=lightning%2Fsrc%2Fblinded_path%2Fpayment.rs;h=5d332a76faf57fed3b2fe844b91d5c5d04ed8a81;hb=7c9463668a4f71663746e57bdb09ee6b91797d5a;hp=32181f7889c350fa3f23f2bdfe37a437d99808d4;hpb=1c9df02cbf51b6e6ac15f3d52da5f95f8b7beed2;p=rust-lightning

diff --git a/lightning/src/blinded_path/payment.rs b/lightning/src/blinded_path/payment.rs
index 32181f78..5d332a76 100644
--- a/lightning/src/blinded_path/payment.rs
+++ b/lightning/src/blinded_path/payment.rs
@@ -8,6 +8,7 @@ use crate::blinded_path::BlindedHop;
 use crate::blinded_path::utils;
 use crate::io;
 use crate::ln::PaymentSecret;
+use crate::ln::channelmanager::CounterpartyForwardingInfo;
 use crate::ln::features::BlindedHopFeatures;
 use crate::ln::msgs::DecodeError;
 use crate::offers::invoice::BlindedPayInfo;
@@ -89,14 +90,34 @@ pub struct PaymentRelay {
 /// [`BlindedHop`]: crate::blinded_path::BlindedHop
 #[derive(Clone, Debug)]
 pub struct PaymentConstraints {
-	/// The maximum total CLTV delta that is acceptable when relaying a payment over this
-	/// [`BlindedHop`].
+	/// The maximum total CLTV that is acceptable when relaying a payment over this [`BlindedHop`].
 	pub max_cltv_expiry: u32,
 	/// The minimum value, in msat, that may be accepted by the node corresponding to this
 	/// [`BlindedHop`].
 	pub htlc_minimum_msat: u64,
 }
 
+impl TryFrom<CounterpartyForwardingInfo> for PaymentRelay {
+	type Error = ();
+
+	fn try_from(info: CounterpartyForwardingInfo) -> Result<Self, ()> {
+		let CounterpartyForwardingInfo {
+			fee_base_msat, fee_proportional_millionths, cltv_expiry_delta
+		} = info;
+
+		// Avoid exposing esoteric CLTV expiry deltas
+		let cltv_expiry_delta = match cltv_expiry_delta {
+			0..=40 => 40,
+			41..=80 => 80,
+			81..=144 => 144,
+			145..=216 => 216,
+			_ => return Err(()),
+		};
+
+		Ok(Self { cltv_expiry_delta, fee_proportional_millionths, fee_base_msat })
+	}
+}
+
 impl Writeable for ForwardTlvs {
 	fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 		encode_tlv_stream!(w, {
@@ -173,7 +194,7 @@ pub(super) fn blinded_hops<T: secp256k1::Signing + secp256k1::Verification>(
 }
 
 /// `None` if underflow occurs.
-fn amt_to_forward_msat(inbound_amt_msat: u64, payment_relay: &PaymentRelay) -> Option<u64> {
+pub(crate) fn amt_to_forward_msat(inbound_amt_msat: u64, payment_relay: &PaymentRelay) -> Option<u64> {
 	let inbound_amt = inbound_amt_msat as u128;
 	let base = payment_relay.fee_base_msat as u128;
 	let prop = payment_relay.fee_proportional_millionths as u128;