@yoroi/api/lib/module/cardano/translators/transformers/asFingerprint.js

The API package of Yoroi SDK

"use strict";

import AssetFingerprint from '@emurgo/cip14-js';
import { getTokenIdentity } from '../helpers/getTokenIdentity';

/**
 * Calculates the fingerprint of a given token ID based on the Cardano CIP14 standard.
 *
 * The function first calls `getTokenIdentity` to extract the `policyId` and `assetName`
 * from the provided `tokenId`. It then generates the asset fingerprint based on these values.
 *
 * @param {Balance.TokenInfo['id']} tokenId - The token ID used to generate the fingerprint.
 * @returns {Readonly<string>} The calculated fingerprint string.
 * @throws {Error} Throws an error if the policy ID extracted from `tokenId` is invalid or has incorrect length.
 */
export function asFingerprint(tokenId) {
  const {
    policyId,
    assetName
  } = getTokenIdentity(tokenId);
  const assetFingerprint = AssetFingerprint.fromParts(Buffer.from(policyId, 'hex'), Buffer.from(assetName, 'hex'));
  return assetFingerprint.fingerprint();
}
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