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46 lines
1.3 KiB
TypeScript
46 lines
1.3 KiB
TypeScript
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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
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import {
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decode as convertBase64ToArrayBuffer,
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encode as convertArrayBufferToBase64,
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} from "./base64.ts";
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/*
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* Some variants allow or require omitting the padding '=' signs:
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* https://en.wikipedia.org/wiki/Base64#URL_applications
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*/
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export function addPaddingToBase64url(base64url: string): string {
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if (base64url.length % 4 === 2) return base64url + "==";
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if (base64url.length % 4 === 3) return base64url + "=";
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if (base64url.length % 4 === 1)
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throw new TypeError("Illegal base64url string!");
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return base64url;
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}
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function convertBase64urlToBase64(base64url: string): string {
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return addPaddingToBase64url(base64url)
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.replace(/\-/g, "+")
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.replace(/_/g, "/");
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}
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function convertBase64ToBase64url(base64: string): string {
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return base64.replace(/=/g, "").replace(/\+/g, "-").replace(/\//g, "_");
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}
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/**
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* Converts given data with base64url encoding.
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* Removes paddings '='.
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* @param data input to encode
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*/
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export function encode(data: string | ArrayBuffer): string {
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return convertBase64ToBase64url(convertArrayBufferToBase64(data));
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}
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/**
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* Converts given base64url encoded data back to original
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* @param data input to decode
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*/
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export function decode(data: string): ArrayBuffer {
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return convertBase64ToArrayBuffer(convertBase64urlToBase64(data));
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}
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