`Fallback`: add `Address` getter and use bitcoin types

[rust-lightning] / lightning-invoice / src / de.rs

diff --git a/lightning-invoice/src/de.rs b/lightning-invoice/src/de.rs
index 92c1cb5c28f5385b5eb2f37c2cbbac62b58ac398..529d81a66fc2d791bb170c23655d0cb693dda9ca 100644 (file)
--- a/lightning-invoice/src/de.rs
+++ b/lightning-invoice/src/de.rs
@@ -1,5 +1,6 @@
 #[cfg(feature = "std")]
 use std::error;
+use core::convert::TryFrom;
 use core::fmt;
 use core::fmt::{Display, Formatter};
 use core::num::ParseIntError;
@@ -9,6 +10,8 @@ use core::str::FromStr;
 use bech32;
 use bech32::{u5, FromBase32};
 
+use bitcoin::{PubkeyHash, ScriptHash};
+use bitcoin::util::address::WitnessVersion;
 use bitcoin_hashes::Hash;
 use bitcoin_hashes::sha256;
 use crate::prelude::*;
@@ -552,27 +555,24 @@ impl FromBase32 for Fallback {
                                if bytes.len() < 2 || bytes.len() > 40 {
                                        return Err(ParseError::InvalidSegWitProgramLength);
                                }
-
+                               let version = WitnessVersion::try_from(version).expect("0 through 16 are valid SegWit versions");
                                Ok(Fallback::SegWitProgram {
                                        version: version,
                                        program: bytes
                                })
                        },
                        17 => {
-                               if bytes.len() != 20 {
-                                       return Err(ParseError::InvalidPubKeyHashLength);
-                               }
-                               //TODO: refactor once const generics are available
-                               let mut pkh = [0u8; 20];
-                               pkh.copy_from_slice(&bytes);
+                               let pkh = match PubkeyHash::from_slice(&bytes) {
+                                       Ok(pkh) => pkh,
+                                       Err(bitcoin_hashes::Error::InvalidLength(_, _)) => return Err(ParseError::InvalidPubKeyHashLength),
+                               };
                                Ok(Fallback::PubKeyHash(pkh))
                        }
                        18 => {
-                               if bytes.len() != 20 {
-                                       return Err(ParseError::InvalidScriptHashLength);
-                               }
-                               let mut sh = [0u8; 20];
-                               sh.copy_from_slice(&bytes);
+                               let sh = match ScriptHash::from_slice(&bytes) {
+                                       Ok(sh) => sh,
+                                       Err(bitcoin_hashes::Error::InvalidLength(_, _)) => return Err(ParseError::InvalidScriptHashLength),
+                               };
                                Ok(Fallback::ScriptHash(sh))
                        }
                        _ => Err(ParseError::Skip)
@@ -854,26 +854,29 @@ mod test {
        fn test_parse_fallback() {
                use crate::Fallback;
                use bech32::FromBase32;
+               use bitcoin::{PubkeyHash, ScriptHash};
+               use bitcoin::util::address::WitnessVersion;
+               use bitcoin_hashes::Hash;
 
                let cases = vec![
                        (
                                from_bech32("3x9et2e20v6pu37c5d9vax37wxq72un98".as_bytes()),
-                               Ok(Fallback::PubKeyHash([
+                               Ok(Fallback::PubKeyHash(PubkeyHash::from_slice(&[
                                        0x31, 0x72, 0xb5, 0x65, 0x4f, 0x66, 0x83, 0xc8, 0xfb, 0x14, 0x69, 0x59, 0xd3,
                                        0x47, 0xce, 0x30, 0x3c, 0xae, 0x4c, 0xa7
-                               ]))
+                               ]).unwrap()))
                        ),
                        (
                                from_bech32("j3a24vwu6r8ejrss3axul8rxldph2q7z9".as_bytes()),
-                               Ok(Fallback::ScriptHash([
+                               Ok(Fallback::ScriptHash(ScriptHash::from_slice(&[
                                        0x8f, 0x55, 0x56, 0x3b, 0x9a, 0x19, 0xf3, 0x21, 0xc2, 0x11, 0xe9, 0xb9, 0xf3,
                                        0x8c, 0xdf, 0x68, 0x6e, 0xa0, 0x78, 0x45
-                               ]))
+                               ]).unwrap()))
                        ),
                        (
                                from_bech32("qw508d6qejxtdg4y5r3zarvary0c5xw7k".as_bytes()),
                                Ok(Fallback::SegWitProgram {
-                                       version: u5::try_from_u8(0).unwrap(),
+                                       version: WitnessVersion::V0,
                                        program: Vec::from(&[
                                                0x75u8, 0x1e, 0x76, 0xe8, 0x19, 0x91, 0x96, 0xd4, 0x54, 0x94, 0x1c, 0x45,
                                                0xd1, 0xb3, 0xa3, 0x23, 0xf1, 0x43, 0x3b, 0xd6