feat: add input method on transaction type

bdk-ffi/src/bdk.udl

@@ -582,6 +582,8 @@ interface Transaction {
   sequence<u8> serialize();
 
   u64 weight();
+
+  sequence<TxIn> input();
 };
 
 interface Psbt {
@@ -624,3 +626,10 @@ interface FeeRate {
 
   u64 to_sat_per_kwu();
 };
+
+dictionary TxIn {
+  OutPoint previous_output;
+  Script script_sig;
+  u32 sequence;
+  sequence<sequence<u8>> witness;
+};

bdk-ffi/src/bitcoin.rs

@@ -13,13 +13,14 @@ use bdk::bitcoin::OutPoint as BdkOutPoint;
 use bdk::bitcoin::Psbt as BdkPsbt;
 use bdk::bitcoin::Transaction as BdkTransaction;
 use bdk::bitcoin::Txid;
+use bdk::bitcoin::TxIn as BdkTxIn;
+use bdk::bitcoin::amount::ParseAmountError;
+use bdk::bitcoin::Amount as BdkAmount;
 
 use std::io::Cursor;
 use std::str::FromStr;
 use std::sync::{Arc, Mutex};
 
-use bdk::bitcoin::amount::ParseAmountError;
-use bdk::bitcoin::Amount as BdkAmount;
 
 #[derive(Clone, Debug, PartialEq, Eq)]
 pub struct Amount(pub(crate) BdkAmount);
@@ -169,6 +170,10 @@ impl Transaction {
     pub fn serialize(&self) -> Vec<u8> {
         serialize(&self.0)
     }
+
+    pub fn input(&self) -> Vec<TxIn> {
+        self.0.input.iter().map(|tx_in| tx_in.into()).collect()
+    }
 }
 
 impl From<BdkTransaction> for Transaction {
@@ -239,6 +244,28 @@ impl From<&BdkOutPoint> for OutPoint {
     }
 }
 
+#[derive(Debug, Clone)]
+pub struct TxIn {
+    pub previous_output: OutPoint,
+    pub script_sig: Arc<Script>,
+    pub sequence: u32,
+    pub witness: Vec<Vec<u8>>,
+}
+
+impl From<&BdkTxIn> for TxIn {
+    fn from(tx_in: &BdkTxIn) -> Self {
+        TxIn {
+            previous_output: OutPoint {
+                txid: tx_in.previous_output.txid.to_string(),
+                vout: tx_in.previous_output.vout,
+            },
+            script_sig: Arc::new(Script(tx_in.script_sig.clone())),
+            sequence: tx_in.sequence.0,
+            witness: tx_in.witness.to_vec(),
+        }
+    }
+}
+
 #[derive(Debug, Clone)]
 pub struct TxOut {
     pub value: u64,

bdk-ffi/src/lib.rs

@@ -53,6 +53,7 @@ use crate::wallet::BumpFeeTxBuilder;
 use crate::wallet::SentAndReceivedValues;
 use crate::wallet::TxBuilder;
 use crate::wallet::Update;
+use crate::bitcoin::TxIn;
 use crate::wallet::Wallet;
 
 use bdk::bitcoin::Network;