All files / src nodeIdentifierGetter.ts

100% Statements 27/27
100% Branches 17/17
100% Functions 1/1
100% Lines 27/27
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import {
  convertBinStrToUint8Array,
} from './convertBinStrToUint8Array';
import {
  getMAC,
} from './getMAC';
import {
  getLastResults,
} from './getLastResults';
import {
  randomBytesGenerator,
} from './randomBytesGenerator';
import {
  strings,
} from './strings';
import {
  UUIDVersions,
} from './Enums/UUIDVersions';
 
export function nodeIdentifierGetter(
  version: UUIDVersions,
  hash?: string,
): Uint8Array
{
  let nodeIdentifier: Uint8Array;
  if (version === UUIDVersions.One) {
    /* Create the node ID from the system time. */
    const lastResults = getLastResults();
    if (lastResults &&
        lastResults.nodeIdentifier &&
        'BYTES_PER_ELEMENT' in lastResults.nodeIdentifier)
    {
      return lastResults.nodeIdentifier;
    }
 
    nodeIdentifier = getMAC();
  } else if (version === UUIDVersions.Three || version === UUIDVersions.Five) {
    if (!hash) {
      throw new Error(strings.HASH_ARGUMENT_MISSING);
    }
 
    let nodeIdentifierStr = '';
 
    /* node_identifier */
    nodeIdentifierStr += hash.slice(20, 32);
    let nodeIdentifierBinStr = parseInt(nodeIdentifierStr, 16)
      .toString(2)
      .padStart(48, '0');
 
    /* Set the unicast/multicast bit (the least significant bit in the first
     * byte) to 1, for multicast. */
    nodeIdentifierBinStr =
      nodeIdentifierBinStr.slice(0, 7) +
      '1' +
      nodeIdentifierBinStr.slice(8); 
 
    nodeIdentifier = convertBinStrToUint8Array(nodeIdentifierBinStr);
  } else if (version === UUIDVersions.Four) {
    nodeIdentifier = randomBytesGenerator(6);
  } else if (version === UUIDVersions.Nil) {
    nodeIdentifier = new Uint8Array([ 0, 0, 0, 0, 0, 0, ]);
  } else {
    throw new Error(strings.UUID_VERSION_INVALID);
  }
 
  return nodeIdentifier;
}
 
export default nodeIdentifierGetter;