Add Google Auth Feature

Add Google Authentication Feature

app.py

@@ -17,6 +17,13 @@ PINECONE_ENV = os.getenv("PINECONE_ENV")
 HF_TOKEN = os.getenv("HUGGINGFACEHUB_API_TOKEN")
 USER_ID = "demo_user" # static user for testing 
 
+# === Require Authentication ===
+if "user" not in st.session_state or "email" not in st.session_state["user"]:
+    st.error("Please sign in with your Google account to access the Clinical Trial Discovery tool.")
+    st.stop()
+
+USER_ID = st.session_state["user"]["email"]  # use email as unique user ID
+
 # === Firebase Setup ===
 if not firebase_admin._apps:
     cred = credentials.Certificate("service-account-key.json")