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# copyright 2003-2012 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
#
# This file is part of logilab-common.
#
# logilab-common is free software: you can redistribute it and/or modify it under
# the terms of the GNU Lesser General Public License as published by the Free
# Software Foundation, either version 2.1 of the License, or (at your option) any
# later version.
#
# logilab-common is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License along
# with logilab-common. If not, see <http://www.gnu.org/licenses/>.
"""Unicode email support (extends email from stdlib)"""
__docformat__ = "restructuredtext en"
import email
from encodings import search_function
import sys
from email.utils import parseaddr, parsedate
from email.header import decode_header
from datetime import datetime
from six import text_type, binary_type
try:
from mx.DateTime import DateTime
except ImportError:
DateTime = datetime
import logilab.common as lgc
def decode_QP(string):
parts = []
for decoded, charset in decode_header(string):
if not charset :
charset = 'iso-8859-15'
# python 3 sometimes returns str and sometimes bytes.
# the 'official' fix is to use the new 'policy' APIs
# https://bugs.python.org/issue24797
# let's just handle this bug ourselves for now
if isinstance(decoded, binary_type):
decoded = decoded.decode(charset, 'replace')
assert isinstance(decoded, text_type)
parts.append(decoded)
if sys.version_info < (3, 3):
# decoding was non-RFC compliant wrt to whitespace handling
# see http://bugs.python.org/issue1079
return u' '.join(parts)
return u''.join(parts)
def message_from_file(fd):
try:
return UMessage(email.message_from_file(fd))
except email.errors.MessageParseError:
return ''
def message_from_string(string):
try:
return UMessage(email.message_from_string(string))
except email.errors.MessageParseError:
return ''
class UMessage:
"""Encapsulates an email.Message instance and returns only unicode objects.
"""
def __init__(self, message):
self.message = message
# email.Message interface #################################################
def get(self, header, default=None):
value = self.message.get(header, default)
if value:
return decode_QP(value)
return value
def __getitem__(self, header):
return self.get(header)
def get_all(self, header, default=()):
return [decode_QP(val) for val in self.message.get_all(header, default)
if val is not None]
def is_multipart(self):
return self.message.is_multipart()
def get_boundary(self):
return self.message.get_boundary()
def walk(self):
for part in self.message.walk():
yield UMessage(part)
def get_payload(self, index=None, decode=False):
message = self.message
if index is None:
payload = message.get_payload(index, decode)
if isinstance(payload, list):
return [UMessage(msg) for msg in payload]
if message.get_content_maintype() != 'text':
return payload
if isinstance(payload, text_type):
return payload
charset = message.get_content_charset() or 'iso-8859-1'
if search_function(charset) is None:
charset = 'iso-8859-1'
return text_type(payload or b'', charset, "replace")
else:
payload = UMessage(message.get_payload(index, decode))
return payload
def get_content_maintype(self):
return text_type(self.message.get_content_maintype())
def get_content_type(self):
return text_type(self.message.get_content_type())
def get_filename(self, failobj=None):
value = self.message.get_filename(failobj)
if value is failobj:
return value
try:
return text_type(value)
except UnicodeDecodeError:
return u'error decoding filename'
# other convenience methods ###############################################
def headers(self):
"""return an unicode string containing all the message's headers"""
values = []
for header in self.message.keys():
values.append(u'%s: %s' % (header, self.get(header)))
return '\n'.join(values)
def multi_addrs(self, header):
"""return a list of 2-uple (name, address) for the given address (which
is expected to be an header containing address such as from, to, cc...)
"""
persons = []
for person in self.get_all(header, ()):
name, mail = parseaddr(person)
persons.append((name, mail))
return persons
def date(self, alternative_source=False, return_str=False):
"""return a datetime object for the email's date or None if no date is
set or if it can't be parsed
"""
value = self.get('date')
if value is None and alternative_source:
unix_from = self.message.get_unixfrom()
if unix_from is not None:
try:
value = unix_from.split(" ", 2)[2]
except IndexError:
pass
if value is not None:
datetuple = parsedate(value)
if datetuple:
if lgc.USE_MX_DATETIME:
return DateTime(*datetuple[:6])
return datetime(*datetuple[:6])
elif not return_str:
return None
return value
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