deno.land / std@0.139.0 / encoding / base64url.ts

base64url.ts
// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.// This module is browser compatible.
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 */export 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));}
std
Deno standard library
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