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# -*- coding: utf-8 -*-
# mail.py
# Copyright (C) 2013 LEAP
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
"""
Utility functions for email.
"""
import email
import re
from leap.common.check import leap_assert_type
def get_email_charset(content, default="utf-8"):
"""
Mini parser to retrieve the charset of an email.
:param content: mail contents
:type content: unicode
:param default: optional default value for encoding
:type default: str or None
:returns: the charset as parsed from the contents
:rtype: str
"""
leap_assert_type(content, unicode)
charset = default
try:
em = email.message_from_string(content.encode("utf-8", "replace"))
# Miniparser for: Content-Type: <something>; charset=<charset>
charset_re = r'''charset=(?P<charset>[\w|\d|-]*)'''
charset = re.findall(charset_re, em["Content-Type"])[0]
if charset is None or len(charset) == 0:
charset = default
except Exception:
pass
return charset
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