#! /usr/bin/env python3
# -*- coding: utf-8 -*-
# vim:fenc=utf-8
#
# Copyright © 2019 Maxime “pep” Buquet <pep@bouah.net>
#
# Distributed under terms of the zlib license.

"""
Usage
-----

Base64 encryption plugin.

This plugin also respects security guidelines listed in XEP-0419.

.. glossary::
    /b64
        **Usage:** ``/b64``

        This command enables encryption of outgoing messages for the current
        tab.
"""

from base64 import b64decode, b64encode
from poezio.plugin_e2ee import E2EEPlugin
from slixmpp import Message


class Plugin(E2EEPlugin):
    """Base64 Plugin"""

    encryption_name = 'base64'
    encryption_short_name = 'b64'
    eme_ns = 'urn:xmpps:base64:0'

    # This encryption mechanism is using <body/> as a container
    replace_body_with_eme = False

    def decrypt(self, message: Message, _tab) -> None:
        """
            Decrypt base64
        """
        body = message['body']
        message['body'] = b64decode(body.encode()).decode()

    def encrypt(self, message: Message, _tab) -> None:
        """
            Encrypt to base64
        """
        # TODO: Stop using <body/> for this. Put the encoded payload in another element.
        body = message['body']
        message['body'] = b64encode(body.encode()).decode()