Create frontend

frontend/src/services/auth.js

@@ -0,0 +1,55 @@
+/**
+ * Auth service — detects Telegram WebApp user or falls back to mock.
+ * Auto-registers user on backend if not yet registered.
+ */
+
+const MOCK_USER = {
+  id: 999995,
+  first_name: 'Dev',
+  last_name: 'User',
+  username: 'devuser',
+  photo_url: '',
+};
+
+function getTelegramUser() {
+  try {
+    const tg = window.Telegram?.WebApp;
+    const user = tg?.initDataUnsafe?.user;
+    if (user && user.id) {
+      return {
+        id: user.id,
+        first_name: user.first_name || '',
+        last_name: user.last_name || '',
+        username: user.username || '',
+        photo_url: user.photo_url || '',
+      };
+    }
+  } catch {
+    // Telegram SDK not available
+  }
+  return null;
+}
+
+export const currentUser = getTelegramUser() ?? MOCK_USER;
+export const isTelegram = !!getTelegramUser();
+
+export function initTelegramApp() {
+  const tg = window.Telegram?.WebApp;
+  if (tg) {
+    tg.ready();
+    tg.expand();
+  }
+}
+
+export function showBackButton(onBack) {
+  const tg = window.Telegram?.WebApp;
+  if (tg?.BackButton) {
+    tg.BackButton.show();
+    tg.BackButton.onClick(onBack);
+    return () => {
+      tg.BackButton.offClick(onBack);
+      tg.BackButton.hide();
+    };
+  }
+  return () => { };
+}