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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
/** * {@linkcode encode} and {@linkcode decode} for * [base64 URL safe](https://en.wikipedia.org/wiki/Base64#URL_applications) encoding. * * This module is browser compatible. * * @example * ```ts * import { *   decode, *   encode, * } from "https://deno.land/std@$STD_VERSION/encoding/base64url.ts"; * * const binary = new TextEncoder().encode("foobar"); * const encoded = encode(binary); * console.log(encoded); * // => "Zm9vYmFy" * * console.log(decode(encoded)); * // => Uint8Array(6) [ 102, 111, 111, 98, 97, 114 ] * ``` * * @module */
import * as base64 from "./base64.ts";
/* * Some variants allow or require omitting the padding '=' signs: * https://en.wikipedia.org/wiki/Base64#The_URL_applications * @param base64url */function addPaddingToBase64url(base64url: string): string {  if (base64url.length % 4 === 2) return base64url + "==";  if (base64url.length % 4 === 3) return base64url + "=";  if (base64url.length % 4 === 1) {    throw new TypeError("Illegal base64url string!");  }  return base64url;}
function convertBase64urlToBase64(b64url: string): string {  if (!/^[-_A-Z0-9]*?={0,2}$/i.test(b64url)) {    // Contains characters not part of base64url spec.    throw new TypeError("Failed to decode base64url: invalid character");  }  return addPaddingToBase64url(b64url).replace(/\-/g, "+").replace(/_/g, "/");}
function convertBase64ToBase64url(b64: string): string {  return b64.replace(/=/g, "").replace(/\+/g, "-").replace(/\//g, "_");}
/** * Encodes a given ArrayBuffer or string into a base64url representation * @param data */export function encode(data: ArrayBuffer | string): string {  return convertBase64ToBase64url(base64.encode(data));}
/** * Converts given base64url encoded data back to original * @param b64url */export function decode(b64url: string): Uint8Array {  return base64.decode(convertBase64urlToBase64(b64url));}