email.header.decode_header can not decode string with quotation

[sijianliang]

BPO	28122
Nosy	@warsaw, @bitdancer
Files	demo.py

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2016-09-13.18:42:23.468>
created_at = <Date 2016-09-13.08:49:33.812>
labels = ['type-bug', 'expert-email']
title = 'email.header.decode_header can not decode string with quotation'
updated_at = <Date 2016-09-13.18:42:23.466>
user = 'https://bugs.python.org/sijianliang'

bugs.python.org fields:

activity = <Date 2016-09-13.18:42:23.466>
actor = 'r.david.murray'
assignee = 'none'
closed = True
closed_date = <Date 2016-09-13.18:42:23.468>
closer = 'r.david.murray'
components = ['email']
creation = <Date 2016-09-13.08:49:33.812>
creator = 'sijian liang'
dependencies = []
files = ['44624']
hgrepos = []
issue_num = 28122
keywords = []
message_count = 3.0
messages = ['276214', '276236', '276320']
nosy_count = 4.0
nosy_names = ['barry', 'r.david.murray', 'era', 'sijian liang']
pr_nums = []
priority = 'normal'
resolution = 'out of date'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue28122'
versions = ['Python 2.7']

[sijianliang]

#!/usr/bin/python
#-*- coding:utf-8 -*-
import email
# from email.parser import Parser
def decode_email_header(header, sep=''):
	l = []
	for s, c in header:
		if c:
			l.append(s.decode(c))
		else:
			l.append(s)
	return sep.join(l)
s = email.Header.decode_header('"=?gb18030?B?bWFpbGZvcnRlc3R0?=" <2070776562@qq.com>')
print decode_email_header(s)
s = email.Header.decode_header('=?gb18030?B?bWFpbGZvcnRlc3R0?= <2070776562@qq.com>')
print decode_email_header(s)

# see output:
# "=?gb18030?B?bWFpbGZvcnRlc3R0?=" <2070776562@qq.com>
# mailfortestt<2070776562@qq.com>

[era]

The double quotes around the "human readable" part of the email address are not allowed. Python is handling this correctly.

[bitdancer]

Note, however, that python3 will compensate for this bug in the input, and register a defect for it:

>>> import email
>>> import email.policy
>>> msg = email.message_from_string('To: "=?gb18030?B?bWFpbGZvcnRlc3R0?=" <2070776562@qq.com>\n\ntest body', policy=email.policy.default)
>>> print(msg)
To: "=?gb18030?B?bWFpbGZvcnRlc3R0?=" <2070776562@qq.com>

test body
>>> msg['To']
'mailfortestt <2070776562@qq.com>'
>>> msg['To'].defects
(InvalidHeaderDefect('encoded word inside quoted string',),)