uuid58/index.js

Convert UUID -> base58 and base58 -> UUID

const DASH_REGEXP = /-/g
const BASE58 = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz'
const BASE = BigInt(BASE58.length)
const ONE = BigInt(1)
const ZERO = BigInt(0)
const UUID_INDEXES = [0, 8, 12, 16, 20]

function encode(uuid) {
  try {
    let b = BigInt('0x' + uuid.replace(DASH_REGEXP, ''))
    let u58 = ''
    do {
      u58 = BASE58[b % BASE] + u58
      b = b / BASE
    } while (b > 0)
    return u58
  } catch (e) {
    return uuid
  }
}

function decode(uuid58) {
  try {
    const max = uuid58.length - 1
    const hex = Array.from(uuid58)
      .reduce((acc, chr, pos) => {
        const inc = BASE58.indexOf(chr)
        if (inc < 0) throw new Error()
        return (acc + BigInt(inc)) * (pos < max ? BASE : ONE)
      }, ZERO)
      .toString(16)
      .padStart(32, '0')
    return UUID_INDEXES
      .map((p, i, a) => hex.substring(p, a[i + 1]))
      .join('-')
  } catch (e) {
    return uuid58
  }
}

module.exports = {
  encode,
  decode,
  convertUuidToUuid58: encode,
  convertUuid58ToUuid: decode,
  to58: encode,
  toU: decode,
}