Add Wallet::get_psbt_input function

bdk-ffi/src/bdk.udl

@@ -235,6 +235,9 @@ interface Wallet {
   [Throws=BdkError]
   sequence<LocalUtxo> list_unspent();
 
+  [Throws=BdkError]
+  Input get_psbt_input(LocalUtxo utxo, PsbtSighashType? sighash_type, boolean only_witness_utxo);
+
   [Throws=BdkError]
   sequence<TransactionDetails> list_transactions(boolean include_raw);
 

bdk-ffi/src/lib.rs

@@ -164,6 +164,15 @@ impl From<&OutPoint> for BdkOutPoint {
     }
 }
 
+impl From<OutPoint> for BdkOutPoint {
+    fn from(outpoint: OutPoint) -> Self {
+        BdkOutPoint {
+            txid: Txid::from_str(&outpoint.txid).unwrap(),
+            vout: outpoint.vout,
+        }
+    }
+}
+
 pub struct Balance {
     // All coinbase outputs not yet matured
     pub immature: u64,
@@ -212,6 +221,15 @@ impl From<&BdkTxOut> for TxOut {
     }
 }
 
+impl From<TxOut> for BdkTxOut {
+    fn from(tx_out: TxOut) -> Self {
+        BdkTxOut {
+            value: tx_out.value,
+            script_pubkey: tx_out.script_pubkey.script.clone(),
+        }
+    }
+}
+
 pub struct LocalUtxo {
     outpoint: OutPoint,
     txout: TxOut,
@@ -238,6 +256,17 @@ impl From<BdkLocalUtxo> for LocalUtxo {
     }
 }
 
+impl From<LocalUtxo> for BdkLocalUtxo {
+    fn from(local_utxo: LocalUtxo) -> Self {
+        BdkLocalUtxo {
+            outpoint: local_utxo.outpoint.into(),
+            txout: local_utxo.txout.into(),
+            keychain: local_utxo.keychain,
+            is_spent: local_utxo.is_spent,
+        }
+    }
+}
+
 /// Trait that logs at level INFO every update received (if any).
 pub trait Progress: Send + Sync + 'static {
     /// Send a new progress update. The progress value should be in the range 0.0 - 100.0, and the message value is an

bdk-ffi/src/psbt.rs

@@ -83,7 +83,13 @@ impl PartiallySignedTransaction {
 /// transaction.
 #[derive(Debug)]
 pub(crate) struct Input {
-    inner: BdkInput,
+    _inner: BdkInput,
+}
+
+impl From<BdkInput> for Input {
+    fn from(input: BdkInput) -> Self {
+        Input { _inner: input }
+    }
 }
 
 /// A Signature hash type for the corresponding input. As of taproot upgrade, the signature hash
@@ -109,6 +115,12 @@ impl PsbtSighashType {
     }
 }
 
+impl From<&PsbtSighashType> for BdkPsbtSighashType {
+    fn from(psbt_hash_ty: &PsbtSighashType) -> Self {
+        psbt_hash_ty.inner
+    }
+}
+
 // The goal of these tests to to ensure `bdk-ffi` intermediate code correctly calls `bdk` APIs.
 // These tests should not be used to verify `bdk` behavior that is already tested in the `bdk`
 // crate.

bdk-ffi/src/wallet.rs

@@ -15,7 +15,7 @@ use std::sync::{Arc, Mutex, MutexGuard};
 use crate::blockchain::Blockchain;
 use crate::database::DatabaseConfig;
 use crate::descriptor::Descriptor;
-use crate::psbt::PartiallySignedTransaction;
+use crate::psbt::{Input, PartiallySignedTransaction, PsbtSighashType};
 use crate::{
     AddressIndex, AddressInfo, Balance, BdkError, LocalUtxo, OutPoint, Progress, ProgressHolder,
     RbfValue, Script, ScriptAmount, TransactionDetails, TxBuilderResult,
@@ -156,6 +156,22 @@ impl Wallet {
         let unspents: Vec<BdkLocalUtxo> = self.get_wallet().list_unspent()?;
         Ok(unspents.into_iter().map(LocalUtxo::from).collect())
     }
+
+    /// Get the corresponding PSBT Input for a LocalUtxo.
+    pub(crate) fn get_psbt_input(
+        &self,
+        utxo: LocalUtxo,
+        sighash_type: Option<Arc<PsbtSighashType>>,
+        only_witness_utxo: bool,
+    ) -> Result<Arc<Input>, BdkError> {
+        self.get_wallet()
+            .get_psbt_input(
+                utxo.into(),
+                sighash_type.map(|s| s.deref().into()),
+                only_witness_utxo,
+            )
+            .map(|i| Arc::new(i.into()))
+    }
 }
 
 /// Options for a software signer