-
Notifications
You must be signed in to change notification settings - Fork 576
/
base64url.ts
46 lines (40 loc) · 1.43 KB
/
base64url.ts
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
// 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
*/
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));
}