spring-security/javascript/lib/base64url.js

/*
 * Copyright 2004-present the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

"use strict";

export default {
  encode: function (buffer) {
    const base64 = window.btoa(String.fromCharCode(...new Uint8Array(buffer)));
    return base64.replace(/=/g, "").replace(/\+/g, "-").replace(/\//g, "_");
  },
  decode: function (base64url) {
    const base64 = base64url.replace(/-/g, "+").replace(/_/g, "/");
    const binStr = window.atob(base64);
    const bin = new Uint8Array(binStr.length);
    for (let i = 0; i < binStr.length; i++) {
      bin[i] = binStr.charCodeAt(i);
    }
    return bin.buffer;
  },
};