Only allow creating 1-hop blinded paths.

[rust-lightning] / lightning / src / blinded_path / mod.rs

diff --git a/lightning/src/blinded_path/mod.rs b/lightning/src/blinded_path/mod.rs
index 927bbea9f6e99ab6e15db2cbb619af0e187060ec..89bf7ce5d2f405c4ab7dd87e9ae5347875ad99a1 100644 (file)
--- a/lightning/src/blinded_path/mod.rs
+++ b/lightning/src/blinded_path/mod.rs
@@ -76,6 +76,19 @@ impl BlindedPath {
                })
        }
 
+       /// Create a one-hop blinded path for a payment.
+       pub fn one_hop_for_payment<ES: EntropySource, T: secp256k1::Signing + secp256k1::Verification>(
+               payee_node_id: PublicKey, payee_tlvs: payment::ReceiveTlvs, entropy_source: &ES,
+               secp_ctx: &Secp256k1<T>
+       ) -> Result<(BlindedPayInfo, Self), ()> {
+               // This value is not considered in pathfinding for 1-hop blinded paths, because it's intended to
+               // be in relation to a specific channel.
+               let htlc_maximum_msat = u64::max_value();
+               Self::new_for_payment(
+                       &[], payee_node_id, payee_tlvs, htlc_maximum_msat, entropy_source, secp_ctx
+               )
+       }
+
        /// Create a blinded path for a payment, to be forwarded along `intermediate_nodes`.
        ///
        /// Errors if:
@@ -85,7 +98,7 @@ impl BlindedPath {
        ///
        /// [`ForwardTlvs`]: crate::blinded_path::payment::ForwardTlvs
        //  TODO: make all payloads the same size with padding + add dummy hops
-       pub fn new_for_payment<ES: EntropySource, T: secp256k1::Signing + secp256k1::Verification>(
+       pub(crate) fn new_for_payment<ES: EntropySource, T: secp256k1::Signing + secp256k1::Verification>(
                intermediate_nodes: &[payment::ForwardNode], payee_node_id: PublicKey,
                payee_tlvs: payment::ReceiveTlvs, htlc_maximum_msat: u64, entropy_source: &ES,
                secp_ctx: &Secp256k1<T>