我设法想出了以下方法来实现带附件的gnupg加密邮件的发送。我以使用enigmail发送的thunderbird邮件为模板。
from email.mime.base import MIMEBase
from email.message import Message
import base64
import mimetypes
import os
import gnupg
def get_email_string(email_address_recipient, file_path_attachment, email_message=""):
def get_base64_file(file_path):
with open(file_path, "rb") as f:
b_str = base64.b64encode(f.read())
return b_str
def get_mimetype(file_path):
return mimetypes.guess_type(file_path)[0]
def get_file_name(file_path):
return os.path.basename(file_path)
def get_gpg_cipher_text(string, recipient_email_address):
gpg = gnupg.GPG(gnupghome=DIR_GNUPG)
encrypted_str = str(gpg.encrypt(string, recipient_email_address))
return encrypted_str
msg = Message()
msg.add_header(_name="Content-Type", _value="multipart/mixed", protected_headers="v1")
msg["From"] = EMAIL_FROM
msg["To"] = email_address_recipient
msg_text = Message()
msg_text.add_header(_name="Content-Type", _value="multipart/mixed")
msg_text.add_header(_name="Content-Language", _value="en-US")
msg_body = Message()
msg_body.add_header(_name="Content-Type", _value="text/plain", charset="utf-8")
msg_body.add_header(_name="Content-Transfer-Encoding", _value="quoted-printable")
msg_body.set_payload(email_message + 2*"\n")
msg_attachment = Message()
msg_attachment.add_header(_name="Content-Type", _value=get_mimetype(file_path_attachment), name=get_file_name(file_path_attachment))
msg_attachment.add_header(_name="Content-Transfer-Encoding", _value="base64")
msg_attachment.add_header(_name="Content-Disposition", _value="attachment", filename=get_file_name(file_path_attachment))
msg_attachment.set_payload(get_base64_file(file_path_attachment))
msg_text.attach(msg_body)
msg_text.attach(msg_attachment)
msg.attach(msg_text)
pgp_msg = MIMEBase(_maintype="multipart", _subtype="encrypted", protocol="application/pgp-encrypted")
pgp_msg["From"] = EMAIL_FROM
pgp_msg["To"] = email_address_recipient
pgp_msg_part1 = Message()
pgp_msg_part1.add_header(_name="Content-Type", _value="application/pgp-encrypted")
pgp_msg_part1.add_header(_name="Content-Description", _value="PGP/MIME version identification")
pgp_msg_part1.set_payload("Version: 1" + "\n")
pgp_msg_part2 = Message()
pgp_msg_part2.add_header(_name="Content-Type", _value="application/octet-stream", name="encrypted.asc")
pgp_msg_part2.add_header(_name="Content-Description", _value="OpenPGP encrypted message")
pgp_msg_part2.add_header(_name="Content-Disposition", _value="inline", filename="encrypted.asc")
pgp_msg_part2.set_payload(get_gpg_cipher_text(msg.as_string(), email_address_recipient))
pgp_msg.attach(pgp_msg_part1)
pgp_msg.attach(pgp_msg_part2)
return pgp_msg.as_string()