[New-bugs-announce] [issue28945] get_boundary invokes unquote twice

[bpoaugust]

New submission from bpoaugust:

get_boundary calls get_param('boundary') which unquotes the value.
It then calls utils.collapse_rfc2231_value which also calls unquote.

This causes problems for boundaries that have two sets of quotes.
For example, I have seen the following in the wild:

Content-Type: multipart/mixed; boundary="<<001-3e1dcd5a-119e>>"

Both "" and <> are treated as quotes by unquote.

The result is that both "< and >" are stripped off.
This means that the boundaries no longer match.

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components: email
messages: 282991
nosy: barry, bpoaugust, r.david.murray
priority: normal
severity: normal
status: open
title: get_boundary invokes unquote twice
type: behavior
versions: Python 3.4, Python 3.5

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28945>
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