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from email.mime.application import MIMEApplication
from email.utils import getaddresses, parseaddr
from memoryhole.gpg import Gnupg
from memoryhole.rfc3156 import PGPEncrypted, MultipartEncrypted
def protect(msg, openpgp=Gnupg(), encrypt=True, obscure=True):
"""
Protect an email with memory hole. It will protect the PROTECTED_HEADERS
and if obscure=True will obscure the OBSCURED_HEADERS
:param msg: the email to be protected
:type msg: Message
:param openpgp: the implementation of openpgp to use for encryption and/or
signature
:type openpgp: OpenPGP
:param encrypt: should the message be encrypted
:type encrypt: bool
:param obscure: should the headers be obscured
:type obsucre: bool
:return: an encrypted and/or signed email
:rtype: Message
"""
if encrypt:
return _encrypt_mime(msg, openpgp)
raise NotImplementedError()
def _encrypt_mime(msg, openpgp):
newmsg = MultipartEncrypted('application/pgp-encrypted')
for hkey, hval in msg.items():
newmsg.add_header(hkey, hval)
del(msg[hkey])
encraddr = "" # TODO
signaddr = "" # TODO
encstr = openpgp.encrypt(msg.as_string(unixfrom=False),
encraddr, signaddr)
encmsg = MIMEApplication(
encstr, _subtype='octet-stream', _encoder=lambda x: x)
encmsg.add_header('content-disposition', 'attachment',
filename='msg.asc')
# create meta message
metamsg = PGPEncrypted()
metamsg.add_header('Content-Disposition', 'attachment')
# attach pgp message parts to new message
newmsg.attach(metamsg)
newmsg.attach(encmsg)
return newmsg
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