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/**
* @license
* Copyright 2025 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
import * as os from 'os';
import * as fs from 'fs';
import * as path from 'path';
import { randomUUID } from 'crypto';
import { GEMINI_DIR } from './paths.js';
const homeDir = os.homedir() ?? '';
const geminiDir = path.join(homeDir, GEMINI_DIR);
const userIdFile = path.join(geminiDir, 'user_id');
function ensureGeminiDirExists() {
if (!fs.existsSync(geminiDir)) {
fs.mkdirSync(geminiDir, { recursive: true });
}
}
function readUserIdFromFile(): string | null {
if (fs.existsSync(userIdFile)) {
const userId = fs.readFileSync(userIdFile, 'utf-8').trim();
return userId || null;
}
return null;
}
function writeUserIdToFile(userId: string) {
fs.writeFileSync(userIdFile, userId, 'utf-8');
}
/**
* Retrieves the persistent user ID from a file, creating it if it doesn't exist.
* This ID is used for unique user tracking.
* @returns A UUID string for the user.
*/
export function getPersistentUserId(): string {
try {
ensureGeminiDirExists();
let userId = readUserIdFromFile();
if (!userId) {
userId = randomUUID();
writeUserIdToFile(userId);
}
return userId;
} catch (error) {
console.error(
'Error accessing persistent user ID file, generating ephemeral ID:',
error,
);
return '123456789';
}
}
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