@hellocoop/helper-server/dist/server/crypto.js

Hellō helper functions for server

"use strict";
// Chat-GPT generated code -- tested with its test suite
var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
    if (k2 === undefined) k2 = k;
    var desc = Object.getOwnPropertyDescriptor(m, k);
    if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
      desc = { enumerable: true, get: function() { return m[k]; } };
    }
    Object.defineProperty(o, k2, desc);
}) : (function(o, m, k, k2) {
    if (k2 === undefined) k2 = k;
    o[k2] = m[k];
}));
var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
    Object.defineProperty(o, "default", { enumerable: true, value: v });
}) : function(o, v) {
    o["default"] = v;
});
var __importStar = (this && this.__importStar) || (function () {
    var ownKeys = function(o) {
        ownKeys = Object.getOwnPropertyNames || function (o) {
            var ar = [];
            for (var k in o) if (Object.prototype.hasOwnProperty.call(o, k)) ar[ar.length] = k;
            return ar;
        };
        return ownKeys(o);
    };
    return function (mod) {
        if (mod && mod.__esModule) return mod;
        var result = {};
        if (mod != null) for (var k = ownKeys(mod), i = 0; i < k.length; i++) if (k[i] !== "default") __createBinding(result, mod, k[i]);
        __setModuleDefault(result, mod);
        return result;
    };
})();
Object.defineProperty(exports, "__esModule", { value: true });
exports.checkSecret = void 0;
exports.encryptObj = encryptObj;
exports.decryptObj = decryptObj;
const crypto = __importStar(require("crypto"));
// Function to convert a Uint8Array to a URL-safe base64 string
function uint8ArrayToUrlSafeBase64(uint8Array) {
    const base64String = Buffer.from(uint8Array).toString('base64');
    return base64String.replace(/\+/g, '-').replace(/\//g, '_').replace(/=/g, '');
}
// Function to convert a URL-safe base64 string to a Uint8Array
function urlSafeBase64ToUint8Array(base64String) {
    const base64 = base64String.replace(/-/g, '+').replace(/_/g, '/');
    const padding = '='.repeat((4 - (base64.length % 4)) % 4);
    const binaryString = Buffer.from(base64 + padding, 'base64').toString('binary');
    const uint8Array = new Uint8Array(binaryString.length);
    for (let i = 0; i < binaryString.length; i++) {
        uint8Array[i] = binaryString.charCodeAt(i);
    }
    return uint8Array;
}
// Function to encrypt a JavaScript object and return a URL-safe base64 string
async function encryptObj(obj, secret) {
    const textEncoder = new TextEncoder();
    const encodedData = textEncoder.encode(JSON.stringify(obj));
    const iv = crypto.randomBytes(12);
    const key = Buffer.from(secret, 'hex');
    const cipher = crypto.createCipheriv('aes-256-gcm', key, iv);
    const ciphertext = Buffer.concat([iv, cipher.update(encodedData), cipher.final()]);
    const tag = cipher.getAuthTag();
    const encryptedData = Buffer.concat([ciphertext, tag]);
    return uint8ArrayToUrlSafeBase64(new Uint8Array(encryptedData));
}
// Function to decrypt an encrypted string and return the JavaScript object
async function decryptObj(encryptedStr, secret) {
    try {
        const encryptedData = urlSafeBase64ToUint8Array(encryptedStr);
        const iv = encryptedData.slice(0, 12);
        const tag = encryptedData.slice(-16);
        const ciphertext = encryptedData.slice(12, -16);
        const key = Buffer.from(secret, 'hex');
        const decipher = crypto.createDecipheriv('aes-256-gcm', key, iv);
        decipher.setAuthTag(tag);
        const decryptedData = Buffer.concat([decipher.update(ciphertext), decipher.final()]);
        const decryptedText = new TextDecoder().decode(decryptedData);
        return JSON.parse(decryptedText);
    }
    catch (error) {
        console.error('decryption error - old cookie?');
        // console.error('Decryption error:', error);
        return null;
    }
}
const checkSecret = (secret) => {
    const key = Buffer.from(secret, 'hex');
    return (Buffer.byteLength(key) == 32);
};
exports.checkSecret = checkSecret;
/*****  test code

// Example usage:
const secretKey = 'YourSecretKey';

const originalObj = {
  username: 'JohnDoe',
  email: 'johndoe@example.com',
};

encryptObj(originalObj, secretKey)
  .then((encryptedString) => {
    console.log('Encrypted String:', encryptedString);
    return decryptObj(encryptedString, secretKey);
  })
  .then((decryptedObj) => {
    console.log('Decrypted Object:', decryptedObj);
  })
  .catch((error) => {
    console.error('Error:', error);
  });

****/