added password for security

app.py

@@ -47,6 +47,9 @@ def share():
 
 with st.sidebar:
     st.title(":blue[ChatGPT with Vision]")
+
+    password = st.text_input("Password", type="password")
+
     if st.button("Share", use_container_width=True):
         share()
 
@@ -126,6 +129,9 @@ def push_message(role, content, images=None):
     return message
 
 if prompt := st.chat_input("Type a message", key="chat_input"):
+    if password != st.secrets["PASSWORD"]:
+        st.error("Invalid password. Demo is read-only.")
+        st.stop()
     push_message("user", prompt, images)
     with st.chat_message("user"):
         st.markdown(prompt)