Fix: enforce path limit for db filename fields (#12235)

src/documents/tests/test_consumer.py

@@ -633,6 +633,33 @@ class TestConsumer(
 
         self._assert_first_last_send_progress()
 
+    @mock.patch("documents.consumer.generate_unique_filename")
+    def testFilenameHandlingFallsBackWhenGeneratedPathExceedsDbLimit(self, m):
+        m.side_effect = lambda doc, archive_filename=False: Path(
+            ("a" * 1100 + ".pdf") if not archive_filename else ("b" * 1100 + ".pdf"),
+        )
+
+        with self.get_consumer(
+            self.get_test_file(),
+            DocumentMetadataOverrides(title="new docs"),
+        ) as consumer:
+            consumer.run()
+
+        document = Document.objects.first()
+        self.assertIsNotNone(document)
+        assert document is not None
+
+        self.assertEqual(document.filename, f"{document.pk:07d}.pdf")
+        self.assertLessEqual(len(document.filename), 1024)
+        self.assertLessEqual(
+            len(document.archive_filename),
+            1024,
+        )
+        self.assertIsFile(document.source_path)
+        self.assertIsFile(document.archive_path)
+
+        self._assert_first_last_send_progress()
+
     @override_settings(FILENAME_FORMAT="{correspondent}/{title}")
     @mock.patch("documents.signals.handlers.generate_unique_filename")
     def testFilenameHandlingUnstableFormat(self, m):

src/documents/tests/test_file_handling.py

@@ -1699,6 +1699,21 @@ class TestCustomFieldFilenameUpdates(
         self.assertTrue(Path(self.doc.source_path).is_file())
         self.assertLessEqual(m.call_count, 1)
 
+    @override_settings(FILENAME_FORMAT=None)
+    def test_overlong_storage_path_keeps_existing_filename(self):
+        initial_filename = generate_filename(self.doc)
+        Document.objects.filter(pk=self.doc.pk).update(filename=str(initial_filename))
+        self.doc.refresh_from_db()
+        Path(self.doc.source_path).parent.mkdir(parents=True, exist_ok=True)
+        Path(self.doc.source_path).touch()
+
+        self.doc.storage_path = StoragePath.objects.create(path="a" * 1100)
+        self.doc.save()
+
+        self.doc.refresh_from_db()
+        self.assertEqual(Path(self.doc.filename), initial_filename)
+        self.assertTrue(Path(self.doc.source_path).is_file())
+
 
 class TestPathDateLocalization:
     """