Update app.py

app.py

@@ -13,7 +13,9 @@ class GUI:
             inp.change(self.process, inp, self.out)
         demo.launch()
 
-    def process(self, file):
+    def process(self, file, profile: gr.OAuthProfile | None):
+        if profile is None:
+            return gr.update(value='Login to access the tool.')
         ch_list = epub2txt(file.name, outputlist=True)
         chapter_titles = epub2txt.content_titles
         title = epub2txt.title