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gh-86650: Fix IndexError when parse emails with invalid Message-ID (GH-117934)

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In particularly, one-off addresses generated by Microsoft Outlook:
https://learn.microsoft.com/en-us/office/client-developer/outlook/mapi/one-off-addresses

Co-authored-by: fsc-eriker <72394365+fsc-eriker@users.noreply.github.com>
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Serhiy Storchaka 2024-04-17 10:44:41 +03:00 • committed by GitHub
parent 8cc9adbfdd
commit f74e51229c
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5
Lib/email/_header_value_parser.py
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@ -1520,13 +1520,18 @@ def get_obs_local_part(value):
raise
token, value = get_cfws(value)
obs_local_part.append(token)
if not obs_local_part:
raise errors.HeaderParseError(
"expected obs-local-part but found '{}'".format(value))
if (obs_local_part[0].token_type == 'dot' or
obs_local_part[0].token_type=='cfws' and
len(obs_local_part) > 1 and
obs_local_part[1].token_type=='dot'):
obs_local_part.defects.append(errors.InvalidHeaderDefect(
"Invalid leading '.' in local part"))
if (obs_local_part[-1].token_type == 'dot' or
obs_local_part[-1].token_type=='cfws' and
len(obs_local_part) > 1 and
obs_local_part[-2].token_type=='dot'):
obs_local_part.defects.append(errors.InvalidHeaderDefect(
"Invalid trailing '.' in local part"))