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bpo-38698: Add a new InvalidMessageID token to email header parser. (GH-17503)

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This adds a new InvalidMessageID token to the email header parser which can be
used to represent invalid message-id headers in the parse tree.
This commit is contained in:
Abhilash Raj 2019-12-08 17:35:38 -08:00 • committed by GitHub
parent 080ee5a884
commit 68157da8b4
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3 changed files with 56 additions and 7 deletions
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20
Lib/email/_header_value_parser.py
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@ -850,10 +850,15 @@ class MsgID(TokenList):
# message-id tokens may not be folded.
return str(self) + policy.linesep
class MessageID(MsgID):
token_type = 'message-id'
class InvalidMessageID(MessageID):
token_type = 'invalid-message-id'
class Header(TokenList):
token_type = 'header'
@ -2110,11 +2115,18 @@ def parse_message_id(value):
message_id = MessageID()
try:
token, value = get_msg_id(value)
except errors.HeaderParseError:
message_id.defects.append(errors.InvalidHeaderDefect(
"Expected msg-id but found {!r}".format(value)))
else:
message_id.append(token)
except errors.HeaderParseError as ex:
token = get_unstructured(value)
message_id = InvalidMessageID(token)
message_id.defects.append(
errors.InvalidHeaderDefect("Invalid msg-id: {!r}".format(ex)))
else:
# Value after parsing a valid msg_id should be None.
if value:
message_id.defects.append(errors.InvalidHeaderDefect(
"Unexpected {!r}".format(value)))
return message_id
#