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* Device Identification System
*
* Generates and maintains a unique device ID for tracking cart synchronization
* across multiple devices for the same user.
*/
import { logger } from '@/lib/logging';
const DEVICE_ID_KEY = 'device_id_v1';
/**
* Get or create a unique device ID
* Stored in localStorage for persistence
*/
export function getOrCreateDeviceId(): string {
// Server-side rendering check
if (typeof window === 'undefined') {
return 'server';
}
try {
// Try to get existing device ID
let deviceId = localStorage.getItem(DEVICE_ID_KEY);
if (!deviceId) {
// Generate new device ID
const fingerprint = generateDeviceFingerprint();
const random = Math.random().toString(36).substr(2, 9);
const timestamp = Date.now().toString(36);
deviceId = `${fingerprint}-${timestamp}-${random}`;
// Save to localStorage
localStorage.setItem(DEVICE_ID_KEY, deviceId);
}
return deviceId;
} catch (error) {
logger.error('Failed to get/create device ID', error instanceof Error ? error : new Error(String(error)), { category: 'DEVICE' });
// Fallback to session-based ID
return `fallback-${Date.now()}-${Math.random().toString(36).substr(2, 9)}`;
}
}
/**
* Generate a basic device fingerprint
* Based on browser characteristics (not for security, just for identification)
*/
function generateDeviceFingerprint(): string {
if (typeof window === 'undefined') {
return 'server';
}
try {
// Collect browser info
const userAgent = navigator.userAgent || '';
const language = navigator.language || '';
const timezone = Intl.DateTimeFormat().resolvedOptions().timeZone || '';
const platform = navigator.platform || '';
const screenResolution = `${window.screen.width}x${window.screen.height}`;
// Combine into fingerprint string
const fingerprintString = [
userAgent,
language,
timezone,
platform,
screenResolution,
].join('|');
// Hash the fingerprint
return hashString(fingerprintString).substr(0, 8);
} catch (error) {
logger.error('Failed to generate device fingerprint', error instanceof Error ? error : new Error(String(error)), { category: 'DEVICE' });
return 'unknown';
}
}
/**
* Simple hash function for string
* Not cryptographically secure - just for identification
*/
function hashString(str: string): string {
let hash = 0;
for (let i = 0; i < str.length; i++) {
const char = str.charCodeAt(i);
hash = ((hash << 5) - hash) + char;
hash = hash & hash; // Convert to 32-bit integer
}
return Math.abs(hash).toString(16);
}
/**
* Reset device ID (useful for testing or logout)
*/
export function resetDeviceId(): void {
if (typeof window === 'undefined') return;
try {
localStorage.removeItem(DEVICE_ID_KEY);
} catch (error) {
logger.error('Failed to reset device ID', error instanceof Error ? error : new Error(String(error)), { category: 'DEVICE' });
}
}
/**
* Check if device ID exists
*/
export function hasDeviceId(): boolean {
if (typeof window === 'undefined') return false;
try {
return localStorage.getItem(DEVICE_ID_KEY) !== null;
} catch {
return false;
}
}
/**
* Get device info for debugging
*/
export function getDeviceInfo(): {
deviceId: string;
userAgent: string;
language: string;
timezone: string;
platform: string;
screenResolution: string;
} {
if (typeof window === 'undefined') {
return {
deviceId: 'server',
userAgent: '',
language: '',
timezone: '',
platform: '',
screenResolution: ''};
}
return {
deviceId: getOrCreateDeviceId(),
userAgent: navigator.userAgent,
language: navigator.language,
timezone: Intl.DateTimeFormat().resolvedOptions().timeZone,
platform: navigator.platform,
screenResolution: `${window.screen.width}x${window.screen.height}`};
}
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