87 lines
4 KiB
Diff
87 lines
4 KiB
Diff
From 72ce82abcf9051b18a05350936de7ecab7306662 Mon Sep 17 00:00:00 2001
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From: "Miss Skeleton (bot)" <31488909+miss-islington@users.noreply.github.com>
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Date: Mon, 19 Oct 2020 16:11:37 -0700
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Subject: [PATCH] bpo-27321 Fix email.generator.py to not replace a
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non-existent header. (GH-18074)
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This PR replaces GH-1977. The reason for the replacement is two-fold.
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The fix itself is different is that if the CTE header doesn't exist in the original message, it is inserted. This is important because the new CTE could be quoted-printable whereas the original is implicit 8bit.
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Also the tests are different. The test_nonascii_as_string_without_cte test in GH-1977 doesn't actually test the issue in that it passes without the fix. The test_nonascii_as_string_without_content_type_and_cte test is improved here, and even though it doesn't fail without the fix, it is included for completeness.
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Automerge-Triggered-By: @warsaw
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(cherry picked from commit bf838227c35212709dc43b3c3c57f8e1655c1d24)
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Co-authored-by: Mark Sapiro <mark@msapiro.net>
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---
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Lib/email/generator.py | 6 +
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Lib/test/test_email/test_email.py | 35 ++++++++++
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Misc/NEWS.d/next/Library/2020-01-19-18-40-26.bpo-27321.8e6SpM.rst | 2
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3 files changed, 42 insertions(+), 1 deletion(-)
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create mode 100644 Misc/NEWS.d/next/Library/2020-01-19-18-40-26.bpo-27321.8e6SpM.rst
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--- a/Lib/email/generator.py
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+++ b/Lib/email/generator.py
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@@ -186,7 +186,11 @@ class Generator:
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# If we munged the cte, copy the message again and re-fix the CTE.
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if munge_cte:
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msg = deepcopy(msg)
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- msg.replace_header('content-transfer-encoding', munge_cte[0])
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+ # Preserve the header order if the CTE header already exists.
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+ if msg.get('content-transfer-encoding') is None:
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+ msg['Content-Transfer-Encoding'] = munge_cte[0]
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+ else:
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+ msg.replace_header('content-transfer-encoding', munge_cte[0])
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msg.replace_header('content-type', munge_cte[1])
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# Write the headers. First we see if the message object wants to
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# handle that itself. If not, we'll do it generically.
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--- a/Lib/test/test_email/test_email.py
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+++ b/Lib/test/test_email/test_email.py
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@@ -314,6 +314,41 @@ class TestMessageAPI(TestEmailBase):
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g.flatten(msg)
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self.assertEqual(fullrepr, s.getvalue())
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+ def test_nonascii_as_string_without_cte(self):
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+ m = textwrap.dedent("""\
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+ MIME-Version: 1.0
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+ Content-type: text/plain; charset="iso-8859-1"
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+
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+ Test if non-ascii messages with no Content-Transfer-Encoding set
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+ can be as_string'd:
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+ Föö bär
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+ """)
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+ source = m.encode('iso-8859-1')
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+ expected = textwrap.dedent("""\
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+ MIME-Version: 1.0
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+ Content-type: text/plain; charset="iso-8859-1"
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+ Content-Transfer-Encoding: quoted-printable
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+
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+ Test if non-ascii messages with no Content-Transfer-Encoding set
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+ can be as_string'd:
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+ F=F6=F6 b=E4r
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+ """)
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+ msg = email.message_from_bytes(source)
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+ self.assertEqual(msg.as_string(), expected)
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+
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+ def test_nonascii_as_string_without_content_type_and_cte(self):
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+ m = textwrap.dedent("""\
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+ MIME-Version: 1.0
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+
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+ Test if non-ascii messages with no Content-Type nor
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+ Content-Transfer-Encoding set can be as_string'd:
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+ Föö bär
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+ """)
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+ source = m.encode('iso-8859-1')
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+ expected = source.decode('ascii', 'replace')
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+ msg = email.message_from_bytes(source)
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+ self.assertEqual(msg.as_string(), expected)
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+
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def test_as_bytes(self):
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msg = self._msgobj('msg_01.txt')
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with openfile('msg_01.txt') as fp:
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--- /dev/null
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+++ b/Misc/NEWS.d/next/Library/2020-01-19-18-40-26.bpo-27321.8e6SpM.rst
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@@ -0,0 +1,2 @@
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+Fixed KeyError exception when flattening an email to a string attempts to
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+replace a non-existent Content-Transfer-Encoding header.
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