feat: useful error when submission has inconsistent date (ietf-tools#8576)

* chore: handle errors in app-configure-blobstore.py

* feat: sensible error for inconsistent <date>

Author: jennifer-richards

ietf/submit/utils.py

@@ -58,7 +58,7 @@
 from ietf.utils.mail import is_valid_email
 from ietf.utils.text import parse_unicode, normalize_text
 from ietf.utils.timezone import date_today
-from ietf.utils.xmldraft import XMLDraft
+from ietf.utils.xmldraft import InvalidMetadataError, XMLDraft
 from ietf.person.name import unidecode_name
 
 
@@ -1201,6 +1201,11 @@ def process_submission_xml(filename, revision):
     if not title:
         raise SubmissionError("Could not extract a valid title from the XML")
 
+    try:
+        document_date = xml_draft.get_creation_date()
+    except InvalidMetadataError as err:
+        raise SubmissionError(str(err)) from err
+
     return {
         "filename": xml_draft.filename,
         "rev": xml_draft.revision,
@@ -1210,7 +1215,7 @@ def process_submission_xml(filename, revision):
             for auth in xml_draft.get_author_list()
         ],
         "abstract": None,  # not supported from XML
-        "document_date": xml_draft.get_creation_date(),
+        "document_date": document_date,
         "pages": None,  # not supported from XML
         "words": None,  # not supported from XML
         "first_two_pages": None,  # not supported from XML

ietf/utils/xmldraft.py

@@ -159,7 +159,16 @@ def parse_creation_date(date_elt):
                 day = today.day
             else:
                 day = 15
-        return datetime.date(year, month, day)
+        try:
+            creation_date = datetime.date(year, month, day)
+        except Exception:
+            raise InvalidMetadataError(
+                "The <date> element in the <front> section specified an incomplete date "
+                "that was not consistent with today's date. If you specify only a year, "
+                "it must be the four-digit current year. To use today's date, omit the "
+                "date tag or use <date/>."
+            )
+        return creation_date
 
     def get_creation_date(self):
         return self.parse_creation_date(self.xmlroot.find("front/date"))
@@ -269,3 +278,7 @@ def parser_msgs(self):
 class InvalidXMLError(Exception):
     """File is not valid XML"""
     pass
+
+
+class InvalidMetadataError(Exception):
+    """XML is well-formed but has invalid metadata"""