fix bug

@@ -282,11 +282,14 @@ class DocView(GenericView, DocHandler):
         pdf_file = args.get('pdf_file')
         pdf_file = args.get('pdf_file')
         file_write(pdf_file, tmp_save_path)
         file_write(pdf_file, tmp_save_path)
 
 
-        # if not fitz.open("pdf", pdf_file).isPDF:
-        file = fitz.Document(tmp_save_path)
-        if not file.isPDF:
-            file.close()
+        try:
+            file = fitz.Document(tmp_save_path)
+        except Exception as e:
             raise self.invalid_params(msg='invalid params: not a PDF file')
             raise self.invalid_params(msg='invalid params: not a PDF file')
+        else:
+            if not file.isPDF:
+                file.close()
+                raise self.invalid_params(msg='invalid params: not a PDF file')
 
 
         file.close()
         file.close()
         # 1. 上传信息记录
         # 1. 上传信息记录