def _build_mail_to_encrypt(message: str, files: list) -> MIMEMultipart:
"""
Create the MIMEMultipart mail containing the text message and the potentials attachments.
:param message: The text message of the encrypted email.
:param files: The files to attach and encrypt.
:return: A MIMEMultipart mail object.
"""
mail_to_encrypt = MIMEMultipart()
mail_to_encrypt.policy = policy.SMTPUTF8
if message == '--':
message = sys.stdin.read()
message_mail = MIMEBase('text', 'plain', charset='UTF-8')
message_mail.policy = policy.SMTPUTF8
message_mail.set_payload(message.encode('UTF-8'))
encoders.encode_quopri(message_mail)
mail_to_encrypt.attach(message_mail)
if files:
for file in files:
path = Path(file)
guessed_type = mimetypes.guess_type(path.absolute().as_uri())[0]
if not guessed_type:
print('Could not guess file %s mime-type, using application/octet-stream.' % file, file=sys.stderr)
guessed_type = 'application/octet-stream'
mimetype = guessed_type.split('/')
mail_attachment = MIMEBase(mimetype[0], mimetype[1])
mail_attachment.policy = policy.SMTPUTF8
mail_attachment.set_payload(open(str(path.absolute()), 'rb').read())
encoders.encode_base64(mail_attachment)
mail_attachment.add_header('Content-Disposition', "attachment", filename=path.name)
mail_to_encrypt.attach(mail_attachment)
return mail_to_encrypt
