gh-62222: Fix and extend quoted-printable decoding#152679
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serhiy-storchaka wants to merge 2 commits into
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gh-62222: Fix and extend quoted-printable decoding#152679serhiy-storchaka wants to merge 2 commits into
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binascii.a2b_qp() and quopri now leave an invalid "=" escape in place and rescan the following character instead of consuming it, like email.quoprimime and other decoders (b'==41' now decodes to b'=A'). Add an opt-in strip_ws parameter to binascii.a2b_qp(), quopri.decode(), quopri.decodestring() and email.quoprimime.decode() to strip trailing whitespace per RFC 2045. It is false by default everywhere except email.quoprimime.decode(), preserving every existing default. Also document that email's get_payload(decode=True) does not strip trailing whitespace, contrary to RFC 2045. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Documentation build overview
5 files changed ·
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Register the new "strip_ws" argument name in the global objects tables (make regen-global-objects), needed by static builds where binascii is compiled into the core, and replace an unresolved :func: reference to the undocumented email.quoprimime.decode with a literal. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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binascii.a2b_qp()andquoprinow leave an invalid=escape (one not followed by two hexadecimal digits or a soft line break) in place and rescan the following character instead of consuming it, likeemail.quoprimimeand other quoted-printable decoders. For exampleb'==41'now decodes tob'=A'instead ofb'=41'.A new opt-in
strip_wsparameter is added tobinascii.a2b_qp(),quopri.decode(),quopri.decodestring()andemail.quoprimime.decode(). When true, whitespace at the end of each line is stripped while decoding, as required by RFC 2045 for a quoted-printable body, while encoded whitespace (=20/=09) is preserved. It is false by default everywhere exceptemail.quoprimime.decode(), so every existing default is preserved.The documentation for
email.message.Message.get_payload(decode=True)now notes that it does not strip trailing whitespace from a quoted-printable body, contrary to RFC 2045 — this matches the behavior of common mail clients.binascii.a2b_qp()#62222