Make HTLCDescriptor writeable

[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 89087a10cd414ac9fdeae4331490ef97e73666ea..927bbea9f6e99ab6e15db2cbb619af0e187060ec 100644 (file)
--- a/lightning/src/blinded_path/mod.rs
+++ b/lightning/src/blinded_path/mod.rs
@@ -15,8 +15,9 @@ pub(crate) mod utils;
 
 use bitcoin::secp256k1::{self, PublicKey, Secp256k1, SecretKey};
 
-use crate::sign::EntropySource;
 use crate::ln::msgs::DecodeError;
+use crate::offers::invoice::BlindedPayInfo;
+use crate::sign::EntropySource;
 use crate::util::ser::{Readable, Writeable, Writer};
 
 use crate::io;
@@ -75,25 +76,31 @@ impl BlindedPath {
                })
        }
 
-       /// Create a blinded path for a payment, to be forwarded along `path`. The last node
-       /// in `path` will be the destination node.
+       /// Create a blinded path for a payment, to be forwarded along `intermediate_nodes`.
+       ///
+       /// Errors if:
+       /// * a provided node id is invalid
+       /// * [`BlindedPayInfo`] calculation results in an integer overflow
+       /// * any unknown features are required in the provided [`ForwardTlvs`]
        ///
-       /// Errors if `path` is empty or a node id in `path` is invalid.
+       /// [`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>(
-               intermediate_nodes: &[(PublicKey, payment::ForwardTlvs)], payee_node_id: PublicKey,
-               payee_tlvs: payment::ReceiveTlvs, entropy_source: &ES, secp_ctx: &Secp256k1<T>
-       ) -> Result<Self, ()> {
+               intermediate_nodes: &[payment::ForwardNode], payee_node_id: PublicKey,
+               payee_tlvs: payment::ReceiveTlvs, htlc_maximum_msat: u64, entropy_source: &ES,
+               secp_ctx: &Secp256k1<T>
+       ) -> Result<(BlindedPayInfo, Self), ()> {
                let blinding_secret_bytes = entropy_source.get_secure_random_bytes();
                let blinding_secret = SecretKey::from_slice(&blinding_secret_bytes[..]).expect("RNG is busted");
 
-               Ok(BlindedPath {
-                       introduction_node_id: intermediate_nodes.first().map_or(payee_node_id, |n| n.0),
+               let blinded_payinfo = payment::compute_payinfo(intermediate_nodes, &payee_tlvs, htlc_maximum_msat)?;
+               Ok((blinded_payinfo, BlindedPath {
+                       introduction_node_id: intermediate_nodes.first().map_or(payee_node_id, |n| n.node_id),
                        blinding_point: PublicKey::from_secret_key(secp_ctx, &blinding_secret),
                        blinded_hops: payment::blinded_hops(
                                secp_ctx, intermediate_nodes, payee_node_id, payee_tlvs, &blinding_secret
                        ).map_err(|_| ())?,
-               })
+               }))
        }
 }