@intuitionrobotics/ts-common/dist/utils/random-tools.js

js and ts infra

/*
 * ts-common is the basic building blocks of our typescript projects
 *
 * Copyright (C) 2020 Intuition Robotics
 *
 * 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.
 */
// Use the Web Crypto API via globalThis.crypto instead of Node's "crypto"
// module. Both environments expose getRandomValues() — Node since v19, every
// modern browser since forever. Importing "crypto" at module top-level
// otherwise pulls the crypto-browserify polyfill chain into browser bundles,
// where it produces "ReferenceError: exports is not defined" at runtime.
export function generateHex(length) {
    const bytes = new Uint8Array(Math.ceil(length / 2));
    const crypto = globalThis.crypto;
    if (!crypto?.getRandomValues)
        throw new Error('Web Crypto API (globalThis.crypto.getRandomValues) is not available in this environment');
    crypto.getRandomValues(bytes);
    let hex = '';
    for (const b of bytes)
        hex += b.toString(16).padStart(2, '0');
    return hex.slice(0, length).toLowerCase();
}
export function generateUUID() {
    return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function (c) {
        const r = Math.random() * 16 | 0, v = c === 'x' ? r : (r & 0x3 | 0x8);
        return v.toString(16);
    });
}
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