theseus/bundled-addons/aegis/lib/dgb/psbt/build.js

import { Psbt } from '../deps.js';
import { digibyte } from '../core/index.js';
// Construct an unsigned PSBT from a set of UTXOs and destination outputs.
// Does not add a change output — the caller decides change amount and
// address. Does not compute fees — the caller must have already subtracted
// fee from outputs.
export function buildPsbt(params, network = digibyte) {
    const psbt = new (Psbt())({ network });
    const inputs = params.sortBip69 === false ? params.inputs : sortInputs(params.inputs);
    const outputs = params.sortBip69 === false ? params.outputs : sortOutputs(params.outputs);
    for (const u of inputs) {
        psbt.addInput(inputToPsbtInput(u));
    }
    for (const o of outputs) {
        psbt.addOutput({ address: o.address, value: o.value });
    }
    return psbt;
}
function inputToPsbtInput(u) {
    const input = {
        hash: u.txid,
        index: u.vout,
    };
    if (u.witness) {
        input.witnessUtxo = {
            script: Buffer.from(u.witness.scriptHex, 'hex'),
            value: u.witness.value,
        };
    }
    if (u.nonWitnessTxHex) {
        input.nonWitnessUtxo = Buffer.from(u.nonWitnessTxHex, 'hex');
    }
    if (u.redeemScriptHex) {
        input.redeemScript = Buffer.from(u.redeemScriptHex, 'hex');
    }
    if (u.tapInternalKeyHex) {
        input.tapInternalKey = Buffer.from(u.tapInternalKeyHex, 'hex');
    }
    return input;
}
// BIP69 lexicographic ordering. Improves privacy by not revealing input
// selection order (which can hint at wallet coin-selection strategy).
function sortInputs(inputs) {
    return [...inputs].sort((a, b) => {
        const cmp = a.txid.localeCompare(b.txid);
        return cmp !== 0 ? cmp : a.vout - b.vout;
    });
}
function sortOutputs(outputs) {
    return [...outputs].sort((a, b) => {
        if (a.value !== b.value)
            return a.value - b.value;
        return a.address.localeCompare(b.address);
    });
}
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