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