@ew-did-registry/did/src/utils/parser.ts

The interface of a Decentralised Identity

import { ChainInfo } from '../models';

export const didPattern = '^did:[a-z0-9]+?:?[a-z0-9]+?:(0x[A-Fa-f0-9]{40})$';

/**
 * Checks if did is valid and returns the did method
 *
 * @param did
 * @returns {string}
 */
export function getDIDMethod(did: string): string {
  const match = did.match(didPattern);
  if (!match) {
    throw new Error('Invalid DID');
  }
  const [, method] = did.split(':');
  return method;
}

/**
 * Checks if did is valid and returns the chain did is associated with it
 *
 * @param did
 * @returns {ChainInfo}
 */
export function getDIDChain(did: string): ChainInfo {
  const match = did.match(didPattern);
  if (!match) {
    throw new Error('Invalid DID');
  }
  if (did.split(':').length > 3) {
    const [, , chain] = did.split(':');
    return { foundChainInfo: true, chainInfo: chain };
  }
  return { foundChainInfo: false, chainInfo: undefined };
}