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* Tracker utility functions
* Pure functions extracted from tracker.js for testing and server-side use
*/
/**
* Generate a unique session ID
* Format: s_ + random string + timestamp (both in base36)
*/
export function generateSessionId(): string {
const random = Math.random().toString(36).substring(2, 11);
const timestamp = Date.now().toString(36);
return `s_${random}${timestamp}`;
}
/**
* Extract domain from referrer URL
* Removes www. prefix for consistent comparison
*/
export function getReferrerDomain(referrer: string | null): string | null {
if (!referrer) return null;
try {
const url = new URL(referrer);
return url.hostname.replace(/^www\./, "");
} catch {
return null;
}
}
/**
* Search engine domains for traffic categorization
*/
const SEARCH_ENGINES = [
"google",
"bing",
"yahoo",
"duckduckgo",
"baidu",
"yandex",
];
/**
* Social media domains for traffic categorization
*/
const SOCIAL_MEDIA = [
"facebook",
"instagram",
"twitter",
"linkedin",
"pinterest",
"youtube",
"tiktok",
"snapchat",
];
/**
* Traffic source categories
*/
export type SourceCategory = "direct" | "organic" | "social" | "referral";
/**
* Categorize traffic source based on referrer domain
*/
export function categorizeSource(domain: string | null): SourceCategory {
if (!domain) return "direct";
const lowerDomain = domain.toLowerCase();
// Check search engines
if (SEARCH_ENGINES.some((se) => lowerDomain.includes(se))) {
return "organic";
}
// Check social media
if (SOCIAL_MEDIA.some((sm) => lowerDomain.includes(sm))) {
return "social";
}
return "referral";
}
/**
* Device type detection
*/
export type DeviceType = "desktop" | "mobile" | "tablet";
/**
* Detect device type from user agent string
*/
export function detectDeviceType(userAgent: string): DeviceType {
// Tablet detection (must be checked before mobile)
if (/(tablet|ipad|playbook|silk)|(android(?!.*mobi))/i.test(userAgent)) {
return "tablet";
}
// Mobile detection
if (
/Mobile|Android|iP(hone|od)|IEMobile|BlackBerry|Kindle|Silk-Accelerated|(hpw|web)OS|Opera M(obi|ini)/.test(
userAgent,
)
) {
return "mobile";
}
return "desktop";
}
/**
* Browser name type
*/
export type BrowserName =
| "chrome"
| "firefox"
| "safari"
| "edge"
| "opera"
| "samsung"
| "unknown";
/**
* Browser detection result
*/
export interface BrowserInfo {
name: BrowserName;
version: string | null;
}
/**
* Detect browser from user agent string
*/
export function detectBrowser(userAgent: string): BrowserInfo {
// Order matters - check specific browsers before generic ones
// Samsung Browser
if (/SamsungBrowser/i.test(userAgent)) {
const match = userAgent.match(/SamsungBrowser\/([\d.]+)/);
return { name: "samsung", version: match ? match[1] : null };
}
// Edge (new Chromium-based)
if (/Edg/i.test(userAgent)) {
const match = userAgent.match(/Edg\/([\d.]+)/);
return { name: "edge", version: match ? match[1] : null };
}
// Opera
if (/OPR|Opera/i.test(userAgent)) {
const match = userAgent.match(/(?:OPR|Opera)\/([\d.]+)/);
return { name: "opera", version: match ? match[1] : null };
}
// Chrome (must be after Edge and Opera which also contain Chrome)
if (/Chrome/i.test(userAgent)) {
const match = userAgent.match(/Chrome\/([\d.]+)/);
return { name: "chrome", version: match ? match[1] : null };
}
// Safari (must be after Chrome)
if (/Safari/i.test(userAgent)) {
const match = userAgent.match(/Version\/([\d.]+)/);
return { name: "safari", version: match ? match[1] : null };
}
// Firefox
if (/Firefox/i.test(userAgent)) {
const match = userAgent.match(/Firefox\/([\d.]+)/);
return { name: "firefox", version: match ? match[1] : null };
}
return { name: "unknown", version: null };
}
/**
* OS name type
*/
export type OSName =
| "windows"
| "macos"
| "linux"
| "android"
| "ios"
| "unknown";
/**
* Detect OS from user agent string
*/
export function detectOS(userAgent: string): OSName {
// iOS must be checked before macOS (iOS UAs contain "Mac OS X")
if (/iPhone|iPad|iPod/i.test(userAgent)) return "ios";
if (/Windows/i.test(userAgent)) return "windows";
if (/Mac OS X|Macintosh/i.test(userAgent)) return "macos";
if (/Android/i.test(userAgent)) return "android";
if (/Linux/i.test(userAgent)) return "linux";
return "unknown";
}
/**
* UTM parameters interface
*/
export interface UTMParams {
utm_source: string | null;
utm_medium: string | null;
utm_campaign: string | null;
utm_term: string | null;
utm_content: string | null;
}
/**
* Extract UTM parameters from URL search params
*/
export function extractUTMParams(
searchParams: URLSearchParams | Record<string, string>,
): UTMParams {
const get = (key: string): string | null => {
if (searchParams instanceof URLSearchParams) {
return searchParams.get(key);
}
return searchParams[key] || null;
};
return {
utm_source: get("utm_source"),
utm_medium: get("utm_medium"),
utm_campaign: get("utm_campaign"),
utm_term: get("utm_term"),
utm_content: get("utm_content"),
};
}
/**
* Check if a domain is the same as the current domain (internal navigation)
*/
export function isSameDomain(
referrerDomain: string | null,
currentDomain: string,
): boolean {
if (!referrerDomain) return false;
return (
referrerDomain.toLowerCase() === currentDomain.toLowerCase() ||
referrerDomain.toLowerCase() === `www.${currentDomain.toLowerCase()}` ||
`www.${referrerDomain.toLowerCase()}` === currentDomain.toLowerCase()
);
}
|