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base64url.ts
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/
base64url.ts
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// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
import * as base64 from "./base64.ts";
/*
* Some variants allow or require omitting the padding '=' signs:
* https://en.wikipedia.org/wiki/Base64#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 {
return addPaddingToBase64url(b64url).replace(/\-/g, "+").replace(/_/g, "/");
}
function convertBase64ToBase64url(b64: string): string {
return b64.replace(/=/g, "").replace(/\+/g, "-").replace(/\//g, "_");
}
/**
* Encodes a given Uint8Array into a base64url representation
* @param uint8
*/
export function encode(uint8: Uint8Array): string {
return convertBase64ToBase64url(base64.encode(uint8));
}
/**
* Converts given base64url encoded data back to original
* @param b64url
*/
export function decode(b64url: string): Uint8Array {
return base64.decode(convertBase64urlToBase64(b64url));
}