# Source code for nio.event_builders.direct_messages

    # Copyright © 2018, 2019 Damir Jelić <poljar@termina.org.uk>
    #
    # Permission to use, copy, modify, and/or distribute this software for
    # any purpose with or without fee is hereby granted, provided that the
    # above copyright notice and this permission notice appear in all copies.
    #
    # THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
    # WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
    # MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
    # SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
    # RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
    # CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
    # CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

    """Matrix direct messages module.

    This module contains classes that can be used to send direct events to a Matrix
    homeserver.
    """

    from dataclasses import dataclass, field
    from typing import Dict

    from .event_builder import EventBuilder

    @dataclass
    class ToDeviceMessage(EventBuilder):
        """A to-device message that can be sent to the homeserver.

        Attributes:
            type (str): The type of the message.
            recipient (str): The user to whom we should sent this message.
            recipient_device (str): The device id of the device that the message
                should be sent to.
            content (Dict[Any, Any]): The content that should be sent to the user.

        """

        type: str = field()
        recipient: str = field()
        recipient_device: str = field()
        content: Dict = field()

        def as_dict(self):
            return {"messages": {self.recipient: {self.recipient_device: self.content}}}

    @dataclass
    class DummyMessage(ToDeviceMessage):
        """A dummy to-device mssage that is sent to restart a Olm session."""

        pass

    @dataclass
    class RoomKeyRequestMessage(ToDeviceMessage):
        """A to-device message that requests room keys from other devices.

        Attributes:
            request_id (str): The unique request id that identifies this key
                request.
            session_id (str): The session id that uniquely identifies the room key.
            room_id (str): The room id of the room that the key belongs to.
            algorithm (str): The algorithm of the room key.

        """

        request_id: str = field()
        session_id: str = field()
        room_id: str = field()
        algorithm: str = field()