@toruslabs/metadata-helpers/dist/lib.cjs/helpers/base64url.js

Helper methods for metadata

'use strict';

var bytes = require('./bytes.js');

/**
 * Pad a string to a multiple of segment length (4 for base64url).
 * @param input - The string to pad.
 * @returns The padded string.
 */
function padString(input) {
  const segmentLength = 4;
  const diff = input.length % segmentLength;
  if (!diff) {
    return input;
  }
  return input + "=".repeat(segmentLength - diff);
}
/**
 * Encode a string or Uint8Array to a base64url string.
 * @param input - The string (only support utf8 encoding) or Uint8Array to encode.
 * @returns The base64url string.
 */
function encodeBase64Url(input) {
  const bytes$1 = typeof input === "string" ? bytes.utf8ToBytes(input) : input;
  return fromBase64(bytes.bytesToBase64(bytes$1));
}
/**
 * Decode a base64url string to a string or Uint8Array.
 * @param base64url - The base64url string to decode.
 * @returns The decoded string or Uint8Array.
 */
function decodeBase64Url(base64url) {
  return bytes.bytesToUtf8(bytes.base64ToBytes(toBase64(base64url)));
}
/**
 * Convert a base64url string to a base64 string.
 * @param base64url - The base64url string or Uint8Array (will be converted to string utf8 encoding) to convert.
 * @returns The base64 string.
 */
function toBase64(base64url) {
  const urlString = base64url instanceof Uint8Array ? bytes.bytesToUtf8(base64url) : base64url;
  return padString(urlString).replace(/-/g, "+").replace(/_/g, "/");
}
/**
 * Decode a base64 string to a base64url string.
 * @param base64 - The base64 string to decode.
 * @returns The base64url string.
 */
function fromBase64(base64) {
  return base64.replace(/=/g, "").replace(/\+/g, "-").replace(/\//g, "_");
}
/**
 * Convert a base64url string to a buffer-like object.
 * @param base64url - The base64url string to convert.
 * @returns The buffer-like object.
 */
function toBufferLike(base64url) {
  return bytes.base64ToBytes(toBase64(base64url));
}

exports.decodeBase64Url = decodeBase64Url;
exports.encodeBase64Url = encodeBase64Url;
exports.fromBase64 = fromBase64;
exports.toBase64 = toBase64;
exports.toBufferLike = toBufferLike;