fix(widget): carry landing message in the URL as well as window.name

src/widget/tab-opener.ts

@@ -6,15 +6,15 @@ const DEFAULT_PARAMS: Readonly<Record<string, string>> = Object.freeze({
   utm_medium: 'user_message',
 });
 
-function normalizeMessage(raw: string): string {
+export function normalizeMessage(raw: string): string {
   return raw.trim().replace(/\s+/g, ' ');
 }
 
 function effectiveParams(config: WidgetConfig): Record<string, string> {
   return { ...DEFAULT_PARAMS, ...(config.params ?? {}) };
 }
 
-function buildTargetUrl(config: WidgetConfig, message?: string): string {
+export function buildTargetUrl(config: WidgetConfig, message?: string): string {
   const url = new URL(config.targetUrl);
   url.searchParams.set('auto_accept_policies', '1');
   url.searchParams.set('referrer', window.location.href);
@@ -33,13 +33,17 @@ function buildTargetUrl(config: WidgetConfig, message?: string): string {
 /**
  * Opens the target app with the user's message.
  *
- * Primary: window.open() + window.name (no size limit, cross-origin safe).
- * Fallback (popup blocked): redirect via window.location with message in URL hash.
+ * The message is sent over BOTH channels so losing one still delivers it:
+ *  - window.name — survives cross-origin navigation, no size limit (primary);
+ *  - URL hash — survives when window.name is gone (e.g. an iOS universal-link
+ *    intercept tears down the originating tab) and is also the popup-blocked
+ *    fallback path.
+ * The web app reads window.name first and only falls back to the hash.
  */
 export function openTarget(config: WidgetConfig, message: string): void {
   const text = normalizeMessage(message);
 
-  // Try opening a new tab (must be synchronous in click handler for Safari)
+  // Try opening a new tab (must be synchronous in the click handler for Safari)
   const newTab = window.open('about:blank', '_blank');
   const popupBlocked = !newTab || newTab.closed;
 
@@ -53,7 +57,8 @@ export function openTarget(config: WidgetConfig, message: string): void {
     }
     payload.params = effectiveParams(config);
     newTab.name = JSON.stringify(payload);
-    newTab.location.href = buildTargetUrl(config);
+    // Also carry the message in the URL so it survives a lost window.name.
+    newTab.location.href = buildTargetUrl(config, text || undefined);
   } else {
     // Fallback: redirect in current tab, message in URL hash
     window.location.href = buildTargetUrl(config, text || undefined);

tests/widget-tab-opener.test.ts

@@ -0,0 +1,50 @@
+import { buildTargetUrl, normalizeMessage } from '../src/widget/tab-opener';
+import type { WidgetConfig } from '../src/widget/config';
+
+const base: WidgetConfig = { targetUrl: 'https://app.doctorina.com' };
+
+describe('normalizeMessage', () => {
+  it('trims and collapses internal whitespace', () => {
+    expect(normalizeMessage('  hello   world \n there ')).toBe('hello world there');
+  });
+
+  it('returns an empty string for whitespace-only input', () => {
+    expect(normalizeMessage('   \n\t ')).toBe('');
+  });
+});
+
+describe('buildTargetUrl', () => {
+  it('targets the configured app and always sets auto_accept_policies + referrer', () => {
+    const url = new URL(buildTargetUrl(base));
+    expect(url.origin).toBe('https://app.doctorina.com');
+    expect(url.searchParams.get('auto_accept_policies')).toBe('1');
+    expect(url.searchParams.get('referrer')).toBe(window.location.href);
+  });
+
+  it('adds the default utm_medium=user_message', () => {
+    const url = new URL(buildTargetUrl(base));
+    expect(url.searchParams.get('utm_medium')).toBe('user_message');
+  });
+
+  it('merges custom params and lets them override the default utm_medium', () => {
+    const url = new URL(buildTargetUrl({ ...base, params: { utm_medium: 'campaign', utm_source: 'landing' } }));
+    expect(url.searchParams.get('utm_medium')).toBe('campaign');
+    expect(url.searchParams.get('utm_source')).toBe('landing');
+  });
+
+  it('omits the hash when no message is given', () => {
+    expect(new URL(buildTargetUrl(base)).hash).toBe('');
+  });
+
+  it('carries the message in the URL hash, round-trip safe (unicode + special chars)', () => {
+    const message = 'у меня болит голова & горло';
+    const url = new URL(buildTargetUrl(base, message));
+    expect(url.hash.length).toBeGreaterThan(1);
+    expect(decodeURIComponent(url.hash.slice(1))).toBe(message);
+  });
+
+  it('respects a custom target URL (e.g. the staging web app)', () => {
+    const url = new URL(buildTargetUrl({ ...base, targetUrl: 'https://doctorina-development.web.app' }));
+    expect(url.origin).toBe('https://doctorina-development.web.app');
+  });
+});