/**
 * Copyright 2021 Gravitational, Inc.
 *
 * 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
 *
 *     http://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.
 */ export type Base64urlString = string ; export function base64urlToBuffer ( baseurl64String ) { const padding = '==' . slice ( 0 , ( 4 - ( baseurl64String . length % 4 ) ) % 4 ) ; const base64String = baseurl64String . replace ( /-/g , '+' ) . replace ( /_/g , '/' ) + padding ; const str = atob ( base64String ) ; const buffer = new ArrayBuffer ( str . length ) ; const byteView = new Uint8Array ( buffer ) ; for ( let i = 0 ; i < str . length ; i ++ ) { byteView [ i ] = str . charCodeAt ( i ) ; } return buffer ; } export function bufferToBase64url ( buffer ) { const str = String . fromCharCode . apply ( null , new Uint8Array ( buffer ) ) ; const base64String = btoa ( str ) ; const base64urlString = base64String . replace ( /\+/g , '-' ) . replace ( /\//g , '_' ) . replace ( /=/g , '' ) ; return base64urlString ; }