first draft

LICENSE

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+GNU LESSER GENERAL PUBLIC LICENSE
+Version 3, 29 June 2007
+
+Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+
+Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed.
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+This version of the GNU Lesser General Public License incorporates the terms and conditions of version 3 of the GNU General Public License, supplemented by the additional permissions listed below.
+
+0. Additional Definitions.
+
+As used herein, "this License" refers to version 3 of the GNU Lesser General Public License, and the "GNU GPL" refers to version 3 of the GNU General Public License.
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+"The Library" refers to a covered work governed by this License, other than an Application or a Combined Work as defined below.
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README.md

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+# Janus
+
+Matrix merge bot is a bot that bridge a matrix room to another room in a verry simple way: message a sent from the bot, prefixed by user names.
+
+The primary goal of this bot is to be used in addition to another bridge with double puppeting to only use one account on the bridged platform.
+
+We invite this bot to the room with the bridge, and users are in another room with the bot. The bridge see all messages comming from one user,
+and the message are already prefixed. The down side is that we don't have nice ghost users.

config.yaml.exp

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+---
+username: janus
+homeserver: https://matrix.org
+password: sunaj
+rooms:
+  - "#olympus:matrix.org"
+  - "#athens:matrix.org"
+...

pyproject.toml

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+[build-system]
+requires = ["setuptools>=42.0", "wheel"]
+build-backend = "setuptools.build_meta"

setup.cfg

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+[metadata]
+name = janus
+author = Jean-Marie 'Histausse' Mineau
+author_email = histausse@protonmail
+description = A bot sending message from one matrix room to another
+long_description = file:README.md
+long_description_content_type = text/markdown
+url = https://gitea.auro.re/histausse/janus
+
+[options]
+packages = janus
+python_requires = >=3.9.2
+package_dir = =src
+install_requires =
+    PyYAML>=5.4.1
+	matrix-bot @ git+https://gitea.auro.re/histausse/matrix-bot.git
+
+[options.package_data]
+matrix_bot = py.typed
+
+[options.entry_points]
+console_scripts = 
+	janus=janus.__main__:main

setup.py

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+from setuptools import setup
+
+if __name__ == "__main__":
+    setup()
+

src/janus/__main__.py

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+import argparse
+import asyncio
+
+from .config import load_config
+from .bot import run
+
+async def __main():
+    parser = argparse.ArgumentParser()
+    parser.add_argument("-c", "--config", default="config.yaml")
+    args = parser.parse_args()
+
+    config = load_config(args.config)
+    message_queue = asyncio.Queue()
+    await run(
+        config,
+        message_queue
+    )
+
+def main():
+    asyncio.run(__main())
+
+if __name__ == "__main__":
+    main()

src/janus/bot.py

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+"""
+The bot that send messages.
+"""
+
+import asyncio
+from typing import (
+    Any,
+    NoReturn
+)
+import nio
+from matrix_bot.client import Client
+from matrix_bot.invite_policy import WhiteList
+from matrix_bot.utils import ignore_client_message
+from .config import Config
+
+@ignore_client_message
+async def __pong(
+    client: Client,
+    room: nio.rooms.MatrixRoom,
+    message: nio.events.room_events.RoomMessageText
+):
+    """
+        If the bot is pinged, send "Pong"
+    """
+    if (client.user_name + ':') in message.body:
+        await client.send_message(room.room_id, "Pong")
+
+async def run(
+    config: Config,
+    message_queue: asyncio.Queue[str]
+):
+    """
+        Initialize the bot and send messages added to the queue to the other rooms.
+    """
+
+    @ignore_client_message
+    async def __foward_message(
+        client: Client,
+        from_room: nio.rooms.MatrixRoom,
+        message: nio.events.room_events.RoomMessageText
+    ):
+        """
+            Format and send the message
+        """
+        if (client.user_name + ':') in message.body:
+            return
+        message = f"{ message.sender_key }: { message.body }"
+        for to_room  in rooms:
+            await client.send_message(to_room, message)
+
+    bot = await Client(
+        config.username,
+        config.homeserver,
+        config.password
+    )
+    invite_policy = await WhiteList(bot, config.rooms)
+    bot.set_invite_policy(invite_policy)
+    bot.add_message_callback(__pong)
+    bot.add_message_callback(__foward_message)
+    await bot.run()

src/janus/config.py

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+"""
+Config related tools.
+"""
+
+import dataclasses
+import yaml
+
+from typing import Optional
+
+@dataclasses.dataclass
+class Config:
+    username: str
+    homeserver: str
+    password: str
+    rooms: list[str]
+
+def load_config(file:str)->Config:
+    """
+        Load the config from the config file.
+    """
+    with open(file, 'r') as f:
+        data = yaml.load(f, Loader=yaml.loader.SafeLoader)
+    config = Config(**data)
+    return config
+