jsonld-signatures-merkleproof2019/lib/cjs/helpers/getChain.js

A jsonld signature implementation to support MerkleProof2019 verification in Verifiable Credential context

import { BLOCKCHAINS } from '@blockcerts/explorer-lookup';
import { capitalize } from '../utils/string.js';
// merkleRoot2019: see https://w3c-dvcg.github.io/lds-merkle-proof-2019/#blockchain-keymap
function getMerkleRoot2019Chain(anchor) {
    const dataArray = anchor.split(':');
    let mainChain;
    switch (dataArray[1]) {
        case BLOCKCHAINS.mocknet.blinkCode:
            return getChainObject(BLOCKCHAINS.mocknet.signatureValue);
        case BLOCKCHAINS.bitcoin.blinkCode:
            mainChain = BLOCKCHAINS.bitcoin.name;
            break;
        case BLOCKCHAINS.ethmain.blinkCode:
            mainChain = BLOCKCHAINS.ethmain.name;
            break;
        default:
            throw new Error('Could not retrieve chain.');
    }
    const network = dataArray[2];
    const chainCodeSignatureValue = mainChain.toLowerCase() + capitalize(network);
    return getChainObject(chainCodeSignatureValue);
}
function getChainObject(chainCodeProofValue) {
    const chainObject = Object.keys(BLOCKCHAINS)
        .map(key => BLOCKCHAINS[key])
        .find((entry) => entry.signatureValue === chainCodeProofValue);
    return chainObject;
}
export default function getChain(proof = null) {
    if (proof === null || proof === void 0 ? void 0 : proof.anchors) {
        const { anchors } = proof;
        const anchor = anchors[0];
        if (typeof anchor === 'string') {
            return getMerkleRoot2019Chain(anchor);
        }
    }
    return null;
}