five-bells-condition/src/util/base64url.js

Implementation of crypto-conditions in JavaScript

'use strict'

/**
 * @module util
 */

/**
 * Utility class for encoding and decoding Base64Url.
 */
class Base64Url {
  /**
   * Convert a base64url encoded string to a Buffer.
   *
   * @param {String} base64urlString base64url-encoded string
   * @return {Buffer} Decoded data.
   */
  static decode (base64urlString) {
    const base64String = base64urlString
      .replace(/-/g, '+')
      .replace(/_/g, '/')
    return new Buffer(base64String, 'base64')
  }

  /**
   * Encode a buffer as base64url.
   *
   * @param {Buffer} buffer Data to encode.
   * @return {String} base64url-encoded data.
   */
  static encode (buffer) {
    return buffer.toString('base64')
      .replace(/=/g, '')
      .replace(/\+/g, '-')
      .replace(/\//g, '_')
  }
}

module.exports = Base64Url