36 lines
1.5 KiB
JavaScript
36 lines
1.5 KiB
JavaScript
import { Buffer } from 'buffer';
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import base58 from 'bs58';
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import cc from 'five-bells-condition';
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import clone from 'clone';
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import serializeTransactionIntoCanonicalString from './serializeTransactionIntoCanonicalString';
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/**
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* @public
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* Sign the given `transaction` with the given `privateKey`s, returning a new copy of `transaction`
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* that's been signed.
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* Note: Only generates Ed25519 Fulfillments. Thresholds and other types of Fulfillments are left as
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* an exercise for the user.
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* @param {object} transaction Transaction to sign. `transaction` is not modified.
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* @param {...string} privateKeys Private keys associated with the issuers of the `transaction`.
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* Looped through to iteratively sign any Input Fulfillments found in
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* the `transaction`.
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* @returns {object} The signed version of `transaction`.
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*/
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export default function signTransaction(transaction, ...privateKeys) {
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const signedTx = clone(transaction);
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signedTx.inputs.forEach((input, index) => {
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const privateKey = privateKeys[index];
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const privateKeyBuffer = new Buffer(base58.decode(privateKey));
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const serializedTransaction = serializeTransactionIntoCanonicalString(transaction);
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const ed25519Fulfillment = new cc.Ed25519();
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ed25519Fulfillment.sign(new Buffer(serializedTransaction), privateKeyBuffer);
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const fulfillmentUri = ed25519Fulfillment.serializeUri();
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input.fulfillment = fulfillmentUri;
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});
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return signedTx;
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}
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