Update app.py

app.py

@@ -51,21 +51,25 @@ def extract_text_from_xlsx(file):
             text.append(line)
     return "\n".join(text)
 
-def summarize_document(file: UploadFile):
-    ext = file.filename.split(".")[-1].lower()
-    if ext == "pdf":
+def summarize_document(file):
+    import os
+
+    name = getattr(file, "name", "")
+    ext = os.path.splitext(name)[1].lower()
+
+    if ext == ".pdf":
         text = extract_text_from_pdf(file)
-    elif ext == "docx":
+    elif ext == ".docx":
         text = extract_text_from_docx(file)
-    elif ext == "pptx":
+    elif ext == ".pptx":
         text = extract_text_from_pptx(file)
-    elif ext == "xlsx":
+    elif ext == ".xlsx":
         text = extract_text_from_xlsx(file)
     else:
         return "Unsupported file format."
 
     if not text.strip():
-        return "No extractable text."
+        return "No extractable text found."
 
     text = text[:3000]
     try: