Sanitize worksheet titles

server/vbv_lernwelt/feedback/services.py

@@ -185,7 +185,7 @@ def export_feedback(course_session_ids: list[str], save_as_file: bool):
 
 
 def _create_sheet(wb: Workbook, title: str, data: list[FeedbackResponse]):
-    sheet = wb.create_sheet(title=title)
+    sheet = wb.create_sheet(title=_sanitize_sheet_name(title))
 
     if len(data) == 0:
         return sheet
@@ -208,6 +208,24 @@ def _create_sheet(wb: Workbook, title: str, data: list[FeedbackResponse]):
     return sheet
 
 
+def _sanitize_sheet_name(text, default_name="DefaultSheet"):
+    if text is None:
+        return default_name
+
+    prohibited_chars = ["\\", "/", "*", "?", ":", "[", "]"]
+    for char in prohibited_chars:
+        text = text.replace(char, "")
+
+    text = text.strip("'")
+
+    text = text[:31]
+
+    if len(text) == 0:
+        return default_name
+
+    return text
+
+
 def _add_rows(sheet, data, question_data):
     for row_idx, feedback in enumerate(data, start=2):
         sheet.cell(row=row_idx, column=1, value=feedback.course_session.title)