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Angular UTM & First/Last Touch tracker with Cookies
- Service: UTMTrackerService
- Usage: call utmTracker.initOnFirstPage() on the first page of each session (e.g. AppComponent ngOnInit)
- When sending a lead to HubSpot, call utmTracker.getHubspotPayload() to get First... and Last... fields
- After creating the Deal in HubSpot, call utmTracker.markDealAsSubmitted(dealId) to prevent future updates for that deal
Notes:
- Uses sessionStorage for "Current..." keys
- Uses cookies (6 month expiry) for "First..." keys
- Never overwrites First values (cookie check before set)
- Works only in browser (uses isPlatformBrowser guard)
- "Referrer" is captured once per session (session_referrer) and reused.
- Ignores self-referrals using `siteDomain`
*/
import { isPlatformBrowser } from '@angular/common';
import { inject, Injectable, PLATFORM_ID } from '@angular/core';
import { CookieService } from 'ngx-cookie-service';
export interface UTMValues {
utm_source: string | null;
utm_medium: string | null;
utm_campaign: string | null;
landing_page: string | null;
referrer: string | null;
queries: string | null;
}
@Injectable({ providedIn: 'root' })
export class UTMTrackerService {
// Key name factories
private currentPrefix = 'current_';
private firstPrefix = 'first_';
private submittedDealKeyPrefix = 'hs_deal_submitted_';
private cookieService = inject(CookieService);
// site config (set your root domain, without www.)
private siteDomain = ['gorealtravel.com', 'web.staging.gorealtravel.com', 'localhost'];
isBrowser: boolean;
constructor() {
const platformId = inject(PLATFORM_ID);
this.isBrowser = isPlatformBrowser(platformId);
}
// Public init to be called on the first page of each visit (session)
initOnFirstPage(): void {
if (!this.isBrowser) return;
this.captureReferrerOnce();
this.captureLandingPageOnce();
this.captureQueriesOnce();
this.captureUTMsOnce(); // ✅ NEW
const current = this.buildCurrentUTMValues();
this.setSessionValues(current);
if (!this.cookiesHaveFirstValues()) {
this.setFirstValuesIfMissing(current);
}
}
private captureQueriesOnce(): void {
const key = 'session_queries';
if (!sessionStorage.getItem(key)) {
const q =
typeof window !== 'undefined' ? (window.location.search ? window.location.search.substring(1) : '') : null;
if (q) {
sessionStorage.setItem(key, q);
}
}
}
private getSessionQueries(): string | null {
return sessionStorage.getItem('session_queries');
}
private captureLandingPageOnce(): void {
const key = 'session_landing_page';
if (!sessionStorage.getItem(key)) {
let lp = this.getCanonical();
if (!lp && typeof window !== 'undefined') {
// ✅ strip query + hash
const url = new URL(window.location.href);
lp = url.origin + url.pathname;
}
if (lp) {
sessionStorage.setItem(key, lp);
}
}
}
private getSessionLandingPage(): string | null {
return sessionStorage.getItem('session_landing_page');
}
private captureUTMsOnce(): void {
const keys = ['utm_source', 'utm_medium', 'utm_campaign'];
const params = new URLSearchParams(typeof window !== 'undefined' ? window.location.search : '');
keys.forEach((key) => {
const sessionKey = 'session_' + key;
if (!sessionStorage.getItem(sessionKey)) {
const value = params.get(key);
if (value) {
// ✅ normalize to lowercase
sessionStorage.setItem(sessionKey, value.toLowerCase());
}
}
});
}
private getSessionUTM(key: string): string | null {
return sessionStorage.getItem('session_' + key);
}
// Build UTM values using URL and referrer
private buildCurrentUTMValues(): UTMValues {
const utm_source = this.getSessionUTM('utm_source');
const utm_medium = this.getSessionUTM('utm_medium');
const utm_campaign = this.getSessionUTM('utm_campaign');
const landing_page = this.getSessionLandingPage();
const referrer = this.getSessionReferrer();
const queries = this.getSessionQueries();
return {
utm_source,
utm_medium,
utm_campaign,
landing_page,
referrer,
queries,
};
}
private captureReferrerOnce(): void {
const key = 'session_referrer';
if (!sessionStorage.getItem(key)) {
const ref = document?.referrer || null;
if (ref && !this.isSelfReferral(ref)) {
try {
// ✅ store only hostname (or origin if you prefer)
const url = new URL(ref);
sessionStorage.setItem(key, url.origin + '/'); // matches your spec format
} catch {
sessionStorage.setItem(key, ref);
}
}
}
}
private getSessionReferrer(): string | null {
return sessionStorage.getItem('session_referrer');
}
// Check if referrer is internal (self-referral)
private isSelfReferral(referrer: string): boolean {
try {
const url = new URL(referrer);
// check if referrer hostname matches any of the domains in the array
return this.siteDomain.some((domain) => url.hostname.includes(domain));
} catch {
return false;
}
}
// Get canonical URL if present
private getCanonical(): string | null {
if (typeof document === 'undefined') return null;
const el = document.querySelector('link[rel="canonical"]') as HTMLLinkElement | null;
return el?.href || null;
}
// Session storage helpers
private setSessionValues(values: UTMValues) {
try {
sessionStorage.setItem(this.currentPrefix + 'utm_source', values.utm_source ?? '');
sessionStorage.setItem(this.currentPrefix + 'utm_medium', values.utm_medium ?? '');
sessionStorage.setItem(this.currentPrefix + 'utm_campaign', values.utm_campaign ?? '');
sessionStorage.setItem(this.currentPrefix + 'landing_page', values.landing_page ?? '');
sessionStorage.setItem(this.currentPrefix + 'referrer', values.referrer ?? '');
sessionStorage.setItem(this.currentPrefix + 'queries', values.queries ?? '');
} catch (e) {
console.warn('UTMTracker: failed to set session values', e);
}
}
// Cookie helpers for First values
private cookiesHaveFirstValues(): boolean {
try {
return this.cookieService.check(this.firstPrefix + 'utm_source');
} catch {
return false;
}
}
private setFirstValuesIfMissing(current: UTMValues) {
const expiry = this.sixMonthsFromNow();
try {
this.setCookieIfMissing('utm_source', current.utm_source, expiry);
this.setCookieIfMissing('utm_medium', current.utm_medium, expiry);
this.setCookieIfMissing('utm_campaign', current.utm_campaign, expiry);
this.setCookieIfMissing('landing_page', current.landing_page, expiry);
this.setCookieIfMissing('referrer', current.referrer, expiry);
this.setCookieIfMissing('queries', current.queries, expiry);
} catch (e) {
console.warn('UTMTracker: failed to set first values', e);
}
}
private setCookieIfMissing(keySuffix: string, value: string | null, expiry: Date) {
const key = this.firstPrefix + keySuffix;
if (!this.cookieService.check(key)) {
this.cookieService.set(key, value ?? '', { expires: expiry, sameSite: 'Lax', path: '/' });
}
}
private safeCookieGet(key: string): string | null {
try {
if (!this.cookieService.check(key)) return null;
const v = this.cookieService.get(key);
return v === '' ? null : v;
} catch {
return null;
}
}
private sixMonthsFromNow(): Date {
const d = new Date();
d.setMonth(d.getMonth() + 6);
return d;
}
// Public getter to prepare HubSpot payload
getHubspotPayload(): { [key: string]: string | null } {
if (!this.isBrowser) return {};
const payload: { [key: string]: string | null } = {};
// First values from cookies
payload['first_utm_source'] = this.safeCookieGet(this.firstPrefix + 'utm_source');
payload['first_utm_medium'] = this.safeCookieGet(this.firstPrefix + 'utm_medium');
payload['first_utm_campaign'] = this.safeCookieGet(this.firstPrefix + 'utm_campaign');
payload['first_landing_page'] = this.safeCookieGet(this.firstPrefix + 'landing_page');
payload['first_referrer'] = this.safeCookieGet(this.firstPrefix + 'referrer');
payload['first_queries'] = this.safeCookieGet(this.firstPrefix + 'queries');
// Last values = current session values
payload['last_utm_source'] = this.safeSessionGet(this.currentPrefix + 'utm_source');
payload['last_utm_medium'] = this.safeSessionGet(this.currentPrefix + 'utm_medium');
payload['last_utm_campaign'] = this.safeSessionGet(this.currentPrefix + 'utm_campaign');
payload['last_landing_page'] = this.safeSessionGet(this.currentPrefix + 'landing_page');
payload['last_referrer'] = this.safeSessionGet(this.currentPrefix + 'referrer');
payload['last_queries'] = this.safeSessionGet(this.currentPrefix + 'queries');
return payload;
}
// Deal submission logic: mark deals as submitted
markDealAsSubmitted(dealId: string, snapshotPayload?: object) {
if (!this.isBrowser) return;
try {
const key = this.submittedDealKeyPrefix + dealId;
if (!localStorage.getItem(key)) {
const meta = {
timestamp: new Date().toISOString(),
payload: snapshotPayload || this.getHubspotPayload(),
};
localStorage.setItem(key, JSON.stringify(meta));
}
} catch (e) {
console.warn('UTMTracker: markDealAsSubmitted failed', e);
}
}
isDealSubmitted(dealId: string): boolean {
if (!this.isBrowser) return false;
try {
return !!localStorage.getItem(this.submittedDealKeyPrefix + dealId);
} catch {
return false;
}
}
// Safe session getter
private safeSessionGet(key: string): string | null {
try {
const v = sessionStorage.getItem(key);
return v === null || v === '' ? null : v;
} catch {
return null;
}
}
}
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