constants.js

'use strict'

const baseX = require('@multiformats/base-x')
const Base = require('./base.js')
const { rfc4648 } = require('./rfc4648')
const { decodeText, encodeText } = require('./util')

/** @typedef {import('./types').CodecFactory} CodecFactory */
/** @typedef {import('./types').Codec} Codec */
/** @typedef {import('./types').BaseName} BaseName */
/** @typedef {import('./types').BaseCode} BaseCode */

/** @type {CodecFactory} */
const identity = () => {
  return {
    encode: decodeText,
    decode: encodeText
  }
}

/**
 *
 * name, code, implementation, alphabet
 *
 * @type {Array<[BaseName, BaseCode, CodecFactory, string]>}
 */
const constants = [
  ['identity', '\x00', identity, ''],
  ['base2', '0', rfc4648(1), '01'],
  ['base8', '7', rfc4648(3), '01234567'],
  ['base10', '9', baseX, '0123456789'],
  ['base16', 'f', rfc4648(4), '0123456789abcdef'],
  ['base16upper', 'F', rfc4648(4), '0123456789ABCDEF'],
  ['base32hex', 'v', rfc4648(5), '0123456789abcdefghijklmnopqrstuv'],
  ['base32hexupper', 'V', rfc4648(5), '0123456789ABCDEFGHIJKLMNOPQRSTUV'],
  ['base32hexpad', 't', rfc4648(5), '0123456789abcdefghijklmnopqrstuv='],
  ['base32hexpadupper', 'T', rfc4648(5), '0123456789ABCDEFGHIJKLMNOPQRSTUV='],
  ['base32', 'b', rfc4648(5), 'abcdefghijklmnopqrstuvwxyz234567'],
  ['base32upper', 'B', rfc4648(5), 'ABCDEFGHIJKLMNOPQRSTUVWXYZ234567'],
  ['base32pad', 'c', rfc4648(5), 'abcdefghijklmnopqrstuvwxyz234567='],
  ['base32padupper', 'C', rfc4648(5), 'ABCDEFGHIJKLMNOPQRSTUVWXYZ234567='],
  ['base32z', 'h', rfc4648(5), 'ybndrfg8ejkmcpqxot1uwisza345h769'],
  ['base36', 'k', baseX, '0123456789abcdefghijklmnopqrstuvwxyz'],
  ['base36upper', 'K', baseX, '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ'],
  ['base58btc', 'z', baseX, '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz'],
  ['base58flickr', 'Z', baseX, '123456789abcdefghijkmnopqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ'],
  ['base64', 'm', rfc4648(6), 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'],
  ['base64pad', 'M', rfc4648(6), 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/='],
  ['base64url', 'u', rfc4648(6), 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_'],
  ['base64urlpad', 'U', rfc4648(6), 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_=']
]

/** @type {Record<BaseName,Base>} */
const names = constants.reduce((prev, tupple) => {
  prev[tupple[0]] = new Base(tupple[0], tupple[1], tupple[2], tupple[3])
  return prev
}, /** @type {Record<BaseName,Base>} */({}))

/** @type {Record<BaseCode,Base>} */
const codes = constants.reduce((prev, tupple) => {
  prev[tupple[1]] = names[tupple[0]]
  return prev
}, /** @type {Record<BaseCode,Base>} */({}))

module.exports = {
  names,
  codes
}