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#3196: if needed pad a short base64 encoded word before trying to decode.

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The RFCs encourage following Postel's law: be liberal in what you accept.
So if someone forgot to pad the base64 encoded word payload to an
even four bytes, we add the padding before handing it to base64mime.decode.
Previously, missing padding resulted in a HeaderParseError.

Patch by Jason Williams.
This commit is contained in:
R. David Murray 2010-08-03 22:14:10 +00:00
parent df7f2fd350
commit c4e69cc1d8
4 changed files with 17 additions and 1 deletions
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11
Lib/email/test/test_email.py
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@ -1649,6 +1649,15 @@ Re: =?mac-iceland?q?r=8Aksm=9Arg=8Cs?= baz foo bar =?mac-iceland?q?r=8Aksm?=
(b'rg', None), (b'\xe5', 'iso-8859-1'),
(b'sbord', None)])
def test_rfc2047_B_bad_padding(self):
s = '=?iso-8859-1?B?%s?='
data = [ # only test complete bytes
('dm==', b'v'), ('dm=', b'v'), ('dm', b'v'),
('dmk=', b'vi'), ('dmk', b'vi')
]
for q, a in data:
dh = decode_header(s % q)
self.assertEqual(dh, [(a, 'iso-8859-1')])
# Test the MIMEMessage class
@ -3176,7 +3185,7 @@ A very long line that must get split to something other than at the
def test_broken_base64_header(self):
raises = self.assertRaises
s = 'Subject: =?EUC-KR?B?CSixpLDtKSC/7Liuvsax4iC6uLmwMcijIKHaILzSwd/H0SC8+LCjwLsgv7W/+Mj3IQ?='
s = 'Subject: =?EUC-KR?B?CSixpLDtKSC/7Liuvsax4iC6uLmwMcijIKHaILzSwd/H0SC8+LCjwLsgv7W/+Mj3I ?='
raises(errors.HeaderParseError, decode_header, s)