Update app.py

app.py

@@ -10,6 +10,15 @@ from langchain_core.prompts import PromptTemplate
 from langchain_core.output_parsers import StrOutputParser
 from transformers import pipeline
 
+# Use environment variables for keys
+HF_TOKEN = os.getenv("HF_TOKEN")
+if HF_TOKEN is None:
+    raise ValueError("HF_TOKEN environment variable not set. Please set it in your Hugging Face Space settings.")
+
+NASA_API_KEY = os.getenv("NASA_API_KEY")
+if NASA_API_KEY is None:
+    raise ValueError("NASA_API_KEY environment variable not set. Please set it in your Hugging Face Space settings.")
+
 # Must be the first Streamlit command!
 st.set_page_config(page_title="HAL - NASA ChatBot", page_icon="🚀")