@ar.io/sdk/lib/esm/utils/base64.js

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/**
 * Copyright (C) 2022-2024 Permanent Data Solutions, 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.
 */
import { createHash, randomBytes } from 'crypto';
// safely encodes and decodes base64url strings to and from buffers
const BASE64_CHAR_62 = '+';
const BASE64_CHAR_63 = '/';
const BASE64URL_CHAR_62 = '-';
const BASE64URL_CHAR_63 = '_';
const BASE64_PADDING = '=';
function base64urlToBase64(str) {
    const padLength = str.length % 4;
    if (padLength) {
        str += BASE64_PADDING.repeat(4 - padLength);
    }
    return str
        .replaceAll(BASE64URL_CHAR_62, BASE64_CHAR_62)
        .replaceAll(BASE64URL_CHAR_63, BASE64_CHAR_63);
}
function base64urlFromBase64(str) {
    return str
        .replaceAll(BASE64_CHAR_62, BASE64URL_CHAR_62)
        .replaceAll(BASE64_CHAR_63, BASE64URL_CHAR_63)
        .replaceAll(BASE64_PADDING, '');
}
export function fromB64Url(str) {
    const b64Str = base64urlToBase64(str);
    return Buffer.from(b64Str, 'base64');
}
export function toB64Url(buffer) {
    const b64Str = buffer.toString('base64');
    return base64urlFromBase64(b64Str);
}
export function sha256B64Url(input) {
    return toB64Url(createHash('sha256').update(Uint8Array.from(input)).digest());
}
export function getRandomText(length = 32) {
    // Generate a buffer of random bytes
    const buffer = randomBytes(length);
    // Convert bytes to hexadecimal string
    return Array.from(buffer, (byte) => byte.toString(16).padStart(2, '0'))
        .join('')
        .slice(0, length);
}