use crate::FeeRate;
use bitcoin::util::psbt::PartiallySignedTransaction as Psbt;
use bitcoin::TxOut;
pub trait PsbtUtils {
fn get_utxo_for(&self, input_index: usize) -> Option<TxOut>;
fn fee_amount(&self) -> Option<u64>;
fn fee_rate(&self) -> Option<FeeRate>;
}
impl PsbtUtils for Psbt {
#[allow(clippy::all)] fn get_utxo_for(&self, input_index: usize) -> Option<TxOut> {
let tx = &self.unsigned_tx;
if input_index >= tx.input.len() {
return None;
}
if let Some(input) = self.inputs.get(input_index) {
if let Some(wit_utxo) = &input.witness_utxo {
Some(wit_utxo.clone())
} else if let Some(in_tx) = &input.non_witness_utxo {
Some(in_tx.output[tx.input[input_index].previous_output.vout as usize].clone())
} else {
None
}
} else {
None
}
}
fn fee_amount(&self) -> Option<u64> {
let tx = &self.unsigned_tx;
let utxos: Option<Vec<TxOut>> = (0..tx.input.len()).map(|i| self.get_utxo_for(i)).collect();
utxos.map(|inputs| {
let input_amount: u64 = inputs.iter().map(|i| i.value).sum();
let output_amount: u64 = self.unsigned_tx.output.iter().map(|o| o.value).sum();
input_amount
.checked_sub(output_amount)
.expect("input amount must be greater than output amount")
})
}
fn fee_rate(&self) -> Option<FeeRate> {
let fee_amount = self.fee_amount();
fee_amount.map(|fee| {
let weight = self.clone().extract_tx().weight();
FeeRate::from_wu(fee, weight)
})
}
}
#[cfg(test)]
mod test {
use crate::bitcoin::TxIn;
use crate::psbt::Psbt;
use crate::wallet::AddressIndex;
use crate::wallet::AddressIndex::New;
use crate::wallet::{get_funded_wallet, test::get_test_wpkh};
use crate::{psbt, FeeRate, SignOptions};
use std::str::FromStr;
const PSBT_STR: &str = "cHNidP8BAKACAAAAAqsJSaCMWvfEm4IS9Bfi8Vqz9cM9zxU4IagTn4d6W3vkAAAAAAD+////qwlJoIxa98SbghL0F+LxWrP1wz3PFTghqBOfh3pbe+QBAAAAAP7///8CYDvqCwAAAAAZdqkUdopAu9dAy+gdmI5x3ipNXHE5ax2IrI4kAAAAAAAAGXapFG9GILVT+glechue4O/p+gOcykWXiKwAAAAAAAEHakcwRAIgR1lmF5fAGwNrJZKJSGhiGDR9iYZLcZ4ff89X0eURZYcCIFMJ6r9Wqk2Ikf/REf3xM286KdqGbX+EhtdVRs7tr5MZASEDXNxh/HupccC1AaZGoqg7ECy0OIEhfKaC3Ibi1z+ogpIAAQEgAOH1BQAAAAAXqRQ1RebjO4MsRwUPJNPuuTycA5SLx4cBBBYAFIXRNTfy4mVAWjTbr6nj3aAfuCMIAAAA";
#[test]
#[should_panic(expected = "InputIndexOutOfRange")]
fn test_psbt_malformed_psbt_input_legacy() {
let psbt_bip = Psbt::from_str(PSBT_STR).unwrap();
let (wallet, _, _) = get_funded_wallet(get_test_wpkh());
let send_to = wallet.get_address(AddressIndex::New).unwrap();
let mut builder = wallet.build_tx();
builder.add_recipient(send_to.script_pubkey(), 10_000);
let (mut psbt, _) = builder.finish().unwrap();
psbt.inputs.push(psbt_bip.inputs[0].clone());
let options = SignOptions {
trust_witness_utxo: true,
..Default::default()
};
let _ = wallet.sign(&mut psbt, options).unwrap();
}
#[test]
#[should_panic(expected = "InputIndexOutOfRange")]
fn test_psbt_malformed_psbt_input_segwit() {
let psbt_bip = Psbt::from_str(PSBT_STR).unwrap();
let (wallet, _, _) = get_funded_wallet(get_test_wpkh());
let send_to = wallet.get_address(AddressIndex::New).unwrap();
let mut builder = wallet.build_tx();
builder.add_recipient(send_to.script_pubkey(), 10_000);
let (mut psbt, _) = builder.finish().unwrap();
psbt.inputs.push(psbt_bip.inputs[1].clone());
let options = SignOptions {
trust_witness_utxo: true,
..Default::default()
};
let _ = wallet.sign(&mut psbt, options).unwrap();
}
#[test]
#[should_panic(expected = "InputIndexOutOfRange")]
fn test_psbt_malformed_tx_input() {
let (wallet, _, _) = get_funded_wallet(get_test_wpkh());
let send_to = wallet.get_address(AddressIndex::New).unwrap();
let mut builder = wallet.build_tx();
builder.add_recipient(send_to.script_pubkey(), 10_000);
let (mut psbt, _) = builder.finish().unwrap();
psbt.unsigned_tx.input.push(TxIn::default());
let options = SignOptions {
trust_witness_utxo: true,
..Default::default()
};
let _ = wallet.sign(&mut psbt, options).unwrap();
}
#[test]
fn test_psbt_sign_with_finalized() {
let psbt_bip = Psbt::from_str(PSBT_STR).unwrap();
let (wallet, _, _) = get_funded_wallet(get_test_wpkh());
let send_to = wallet.get_address(AddressIndex::New).unwrap();
let mut builder = wallet.build_tx();
builder.add_recipient(send_to.script_pubkey(), 10_000);
let (mut psbt, _) = builder.finish().unwrap();
psbt.inputs.push(psbt_bip.inputs[0].clone());
psbt.unsigned_tx
.input
.push(psbt_bip.unsigned_tx.input[0].clone());
let _ = wallet.sign(&mut psbt, SignOptions::default()).unwrap();
}
#[test]
fn test_psbt_fee_rate_with_witness_utxo() {
use psbt::PsbtUtils;
let expected_fee_rate = 1.2345;
let (wallet, _, _) = get_funded_wallet("wpkh(tprv8ZgxMBicQKsPd3EupYiPRhaMooHKUHJxNsTfYuScep13go8QFfHdtkG9nRkFGb7busX4isf6X9dURGCoKgitaApQ6MupRhZMcELAxTBRJgS/*)");
let addr = wallet.get_address(New).unwrap();
let mut builder = wallet.build_tx();
builder.drain_to(addr.script_pubkey()).drain_wallet();
builder.fee_rate(FeeRate::from_sat_per_vb(expected_fee_rate));
let (mut psbt, _) = builder.finish().unwrap();
let fee_amount = psbt.fee_amount();
assert!(fee_amount.is_some());
let unfinalized_fee_rate = psbt.fee_rate().unwrap();
let finalized = wallet.sign(&mut psbt, Default::default()).unwrap();
assert!(finalized);
let finalized_fee_rate = psbt.fee_rate().unwrap();
assert!(finalized_fee_rate.as_sat_per_vb() >= expected_fee_rate);
assert!(finalized_fee_rate.as_sat_per_vb() < unfinalized_fee_rate.as_sat_per_vb());
}
#[test]
fn test_psbt_fee_rate_with_nonwitness_utxo() {
use psbt::PsbtUtils;
let expected_fee_rate = 1.2345;
let (wallet, _, _) = get_funded_wallet("pkh(tprv8ZgxMBicQKsPd3EupYiPRhaMooHKUHJxNsTfYuScep13go8QFfHdtkG9nRkFGb7busX4isf6X9dURGCoKgitaApQ6MupRhZMcELAxTBRJgS/*)");
let addr = wallet.get_address(New).unwrap();
let mut builder = wallet.build_tx();
builder.drain_to(addr.script_pubkey()).drain_wallet();
builder.fee_rate(FeeRate::from_sat_per_vb(expected_fee_rate));
let (mut psbt, _) = builder.finish().unwrap();
let fee_amount = psbt.fee_amount();
assert!(fee_amount.is_some());
let unfinalized_fee_rate = psbt.fee_rate().unwrap();
let finalized = wallet.sign(&mut psbt, Default::default()).unwrap();
assert!(finalized);
let finalized_fee_rate = psbt.fee_rate().unwrap();
assert!(finalized_fee_rate.as_sat_per_vb() >= expected_fee_rate);
assert!(finalized_fee_rate.as_sat_per_vb() < unfinalized_fee_rate.as_sat_per_vb());
}
#[test]
fn test_psbt_fee_rate_with_missing_txout() {
use psbt::PsbtUtils;
let expected_fee_rate = 1.2345;
let (wpkh_wallet, _, _) = get_funded_wallet("wpkh(tprv8ZgxMBicQKsPd3EupYiPRhaMooHKUHJxNsTfYuScep13go8QFfHdtkG9nRkFGb7busX4isf6X9dURGCoKgitaApQ6MupRhZMcELAxTBRJgS/*)");
let addr = wpkh_wallet.get_address(New).unwrap();
let mut builder = wpkh_wallet.build_tx();
builder.drain_to(addr.script_pubkey()).drain_wallet();
builder.fee_rate(FeeRate::from_sat_per_vb(expected_fee_rate));
let (mut wpkh_psbt, _) = builder.finish().unwrap();
wpkh_psbt.inputs[0].witness_utxo = None;
wpkh_psbt.inputs[0].non_witness_utxo = None;
assert!(wpkh_psbt.fee_amount().is_none());
assert!(wpkh_psbt.fee_rate().is_none());
let (pkh_wallet, _, _) = get_funded_wallet("pkh(tprv8ZgxMBicQKsPd3EupYiPRhaMooHKUHJxNsTfYuScep13go8QFfHdtkG9nRkFGb7busX4isf6X9dURGCoKgitaApQ6MupRhZMcELAxTBRJgS/*)");
let addr = pkh_wallet.get_address(New).unwrap();
let mut builder = pkh_wallet.build_tx();
builder.drain_to(addr.script_pubkey()).drain_wallet();
builder.fee_rate(FeeRate::from_sat_per_vb(expected_fee_rate));
let (mut pkh_psbt, _) = builder.finish().unwrap();
pkh_psbt.inputs[0].non_witness_utxo = None;
assert!(pkh_psbt.fee_amount().is_none());
assert!(pkh_psbt.fee_rate().is_none());
}
}