27988: Make sure iter_attachments does not mutate the payload list.
diff --git a/Lib/email/message.py b/Lib/email/message.py
index aefaf57..6cd6cb7 100644
--- a/Lib/email/message.py
+++ b/Lib/email/message.py
@@ -1022,7 +1022,7 @@
maintype, subtype = self.get_content_type().split('/')
if maintype != 'multipart' or subtype == 'alternative':
return
- parts = self.get_payload()
+ parts = self.get_payload().copy()
if maintype == 'multipart' and subtype == 'related':
# For related, we treat everything but the root as an attachment.
# The root may be indicated by 'start'; if there's no start or we
diff --git a/Lib/test/test_email/test_message.py b/Lib/test/test_email/test_message.py
index d78049e..4345162 100644
--- a/Lib/test/test_email/test_message.py
+++ b/Lib/test/test_email/test_message.py
@@ -732,6 +732,16 @@
m.set_param('filename', 'abc.png', 'Content-Disposition')
self.assertTrue(m.is_attachment())
+ def test_iter_attachments_mutation(self):
+ # We had a bug where iter_attachments was mutating the list.
+ m = self._make_message()
+ m.set_content('arbitrary text as main part')
+ m.add_related('more text as a related part')
+ m.add_related('yet more text as a second "attachment"')
+ orig = m.get_payload().copy()
+ self.assertEqual(len(list(m.iter_attachments())), 2)
+ self.assertEqual(m.get_payload(), orig)
+
class TestEmailMessage(TestEmailMessageBase, TestEmailBase):
message = EmailMessage
diff --git a/Misc/NEWS b/Misc/NEWS
index 7b4f657..bfc693a 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -62,6 +62,8 @@
Library
-------
+- Issue 27988: Fix email iter_attachments incorrect mutation of payload list.
+
- Issue #27691: Fix ssl module's parsing of GEN_RID subject alternative name
fields in X.509 certs.