From 50b396ae7b83c07a34c12a869bfa4abdaaa7a877 Mon Sep 17 00:00:00 2001
From: Rob N <rob.netzke@gmail.com>
Date: Thu, 29 Aug 2024 15:13:05 -1000
Subject: [PATCH] lib: add `TxIn`

---
 src/bitcoin.udl |  7 +++++++
 src/lib.rs      | 39 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 46 insertions(+)

diff --git a/src/bitcoin.udl b/src/bitcoin.udl
index cee7d09..3acafd7 100644
--- a/src/bitcoin.udl
+++ b/src/bitcoin.udl
@@ -44,6 +44,13 @@ dictionary OutPoint {
   u32 vout;
 };
 
+dictionary TxIn {
+  OutPoint previous_output;
+  Script script_sig;
+  u32 sequence;
+  sequence<sequence<u8>> witness;
+};
+
 [NonExhaustive]
 enum Network {
   "Bitcoin",
diff --git a/src/lib.rs b/src/lib.rs
index 0a54e58..a53c571 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,6 +1,11 @@
+use std::sync::Arc;
+
 use bitcoin::Amount as BitcoinAmount;
 use bitcoin::FeeRate as BitcoinFeeRate;
 use bitcoin::ScriptBuf as BitcoinScriptBuf;
+use bitcoin::Sequence;
+use bitcoin::TxIn as BitcoinTxIn;
+
 pub use bitcoin::OutPoint;
 pub use bitcoin::Txid;
 
@@ -85,6 +90,40 @@ impl Amount {
 impl_from_core_type!(Amount, BitcoinAmount);
 impl_from_ffi_type!(Amount, BitcoinAmount);
 
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct TxIn {
+    pub previous_output: OutPoint,
+    pub script_sig: Arc<Script>,
+    pub sequence: u32,
+    pub witness: Vec<Vec<u8>>,
+}
+
+impl From<BitcoinTxIn> for TxIn {
+    fn from(value: BitcoinTxIn) -> Self {
+        Self {
+            previous_output: value.previous_output,
+            script_sig: Arc::new(value.script_sig.into()),
+            sequence: value.sequence.0,
+            witness: value.witness.to_vec(),
+        }
+    }
+}
+
+impl From<TxIn> for BitcoinTxIn {
+    fn from(value: TxIn) -> Self {
+        let script_sig = match Arc::try_unwrap(value.script_sig) {
+            Ok(val) => val.0,
+            Err(arc) => arc.0.clone()
+        };
+        Self {
+            previous_output: value.previous_output,
+            script_sig,
+            sequence: Sequence(value.sequence),
+            witness: value.witness.into(),
+        }
+    }
+}
+
 impl UniffiCustomTypeConverter for Txid {
     type Builtin = String;
     fn into_custom(val: Self::Builtin) -> uniffi::Result<Self> {