Update app.py

app.py

@@ -43,7 +43,8 @@ else:
 # Create the MSAL instance for acquiring tokens
 client_instance = get_msal_app()
 
-def get_access_token(code):
+# Now this function accepts both 'code' and 'code_verifier'
+def get_access_token(code, code_verifier=None):
     client_instance = get_msal_app()
     
     st.write("Debug: MSAL App Configuration:")
@@ -52,11 +53,12 @@ def get_access_token(code):
     st.write(f"Redirect URI: {REDIRECT_URI}")
     
     try:
-        # Remove the 'code_verifier' parameter for now
+        # Use the 'code_verifier' only if provided (for PKCE flow)
         result = client_instance.acquire_token_by_authorization_code(
             code=code,
             scopes=SCOPES,
-            redirect_uri=REDIRECT_URI
+            redirect_uri=REDIRECT_URI,
+            code_verifier=code_verifier  # Ensure this is passed only if PKCE is used
         )
         
         if 'access_token' in result:
@@ -68,6 +70,7 @@ def get_access_token(code):
         st.error(f"Exception in get_access_token: {str(e)}")
         raise
 
+
         
 def process_query_params():
     # ⚙️q= Run ArXiv search from query parameters