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# Copyright (C) 2017 Jan Jancar
#
# This file is a part of the Mailman PGP plugin.
#
# 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/>.
"""Strict inline PGP message wrapper."""
from pgpy import PGPKey, PGPMessage
from pgpy.types import Armorable
from public import public
@public
class InlineWrapper:
"""Inline PGP wrapper."""
def __init__(self, msg):
"""
Wrap the given message.
:param msg: The message to wrap.
:type msg: mailman.email.message.Message
"""
self.msg = msg
def _is_inline(self):
return not self.msg.is_multipart()
def _as_string(self):
return str(self.msg.get_payload())
def _has_signature(self):
try:
msg = PGPMessage.from_blob(self._as_string())
return msg.is_signed
except:
pass
return False
def _has_message(self):
try:
msg = PGPMessage.from_blob(self._as_string())
return msg.is_encrypted
except:
pass
return False
def _has_armor(self, block_type):
try:
dearm = Armorable.ascii_unarmor(self._as_string())
if dearm['magic'] == block_type:
return True
except:
pass
return False
def is_signed(self):
"""
Whether the message is inline signed (cleartext).
:return: If the message is inline signed.
:rtype: bool
"""
return self._is_inline() and self._has_signature()
def is_encrypted(self):
"""
Whether the message is inline encrypted.
:return: If the message is inline encrypted.
:rtype: bool
"""
return self._is_inline() and self._has_message()
def has_keys(self):
"""
Whether the message contains public or private keys.
:return: If the message contains keys.
:rtype: bool
"""
return self._is_inline() and (self._has_armor('PUBLIC KEY BLOCK') or
self._has_armor('PRIVATE KEY BLOCK'))
def keys(self):
"""
Get the collection of keys in this message.
:return: A collection of keys.
"""
# TODO: potentially return all things returned from from_blob?
key, _ = PGPKey.from_blob(self._as_string())
yield key
def verify(self, key):
"""
Verify the signature of this message with key.
:param key: The key to verify with.
:type key: pgpy.PGPKey
:return: The verified signature.
:rtype: pgpy.types.SignatureVerification
"""
message = PGPMessage.from_blob(self._as_string())
return key.verify(message)
def sign(self):
pass
def decrypt(self, key):
"""
Decrypt this message with key.
:param key: The key to decrypt with.
:type key: pgpy.PGPKey
:return: The decrypted message.
:rtype: PGPMessage
"""
message = PGPMessage.from_blob(self._as_string())
return key.decrypt(message)
def encrypt(self):
pass
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