From 5269f5f6b20cde0c04b7c263d2f60b3ff1557539 Mon Sep 17 00:00:00 2001
From: UlrichB22 <97119703+UlrichB22@users.noreply.github.com>
Date: Tue, 10 Dec 2024 20:38:52 +0100
Subject: [PATCH] send_file: seek to the beginning of the file in any case

---
 src/moin/utils/send_file.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/moin/utils/send_file.py b/src/moin/utils/send_file.py
index 31ae4c522..bf8bc432b 100644
--- a/src/moin/utils/send_file.py
+++ b/src/moin/utils/send_file.py
@@ -140,12 +140,15 @@ def send_file(
         # be extra careful as some file-like objects (like zip members) have a seek
         # and tell methods, but they just raise some exception (e.g. UnsupportedOperation)
         # instead of really doing what they are supposed to do (or just be missing).
+        seek_successful = False
         try:
             file.seek(0, 2)  # seek to EOF
+            seek_successful = True
             fsize = file.tell()  # tell position
-            file.seek(0, 0)  # seek to start of file
         except Exception as e:
             logging.warning(f"Exception in send_file: {e}, data file {file.name.rsplit('/', maxsplit=1)[1]}")
+        if seek_successful:
+            file.seek(0, 0)  # seek to start of file
 
     if fsize is not None:
         headers.add("Content-Length", fsize)