bpo-30681: Support invalid date format or value in email Date header (GH-22090)
I am re-submitting an older PR which was abandoned but is still relevant, #10783 by @timb07.
The issue being solved () is still relevant. The original PR #10783 was closed as
the final request changes were not applied and since abandoned.
In this new PR I have re-used the original patch plus applied both comments from the review, by @maxking and @pganssle.
For reference, here is the original PR description:
In email.utils.parsedate_to_datetime(), a failure to parse the date, or invalid date components (such as hour outside 0..23) raises an exception. Document this behaviour, and add tests to test_email/test_utils.py to confirm this behaviour.
In email.headerregistry.DateHeader.parse(), check when parsedate_to_datetime() raises an exception and add a new defect InvalidDateDefect; preserve the invalid value as the string value of the header, but set the datetime attribute to None.
Add tests to test_email/test_headerregistry.py to confirm this behaviour; also added test to test_email/test_inversion.py to confirm emails with such defective date headers round trip successfully.
This pull request incorporates feedback gratefully received from @bitdancer, @brettcannon, @Mariatta and @warsaw, and replaces the earlier PR #2254.
Automerge-Triggered-By: GH:warsaw
diff --git a/Lib/email/utils.py b/Lib/email/utils.py
index 1a7719d..a8e46a7 100644
--- a/Lib/email/utils.py
+++ b/Lib/email/utils.py
@@ -195,7 +195,10 @@ def make_msgid(idstring=None, domain=None):
def parsedate_to_datetime(data):
- *dtuple, tz = _parsedate_tz(data)
+ parsed_date_tz = _parsedate_tz(data)
+ if parsed_date_tz is None:
+ raise ValueError('Invalid date value or format "%s"' % str(data))
+ *dtuple, tz = parsed_date_tz
if tz is None:
return datetime.datetime(*dtuple[:6])
return datetime.datetime(*dtuple[:6],