107 lines
3.3 KiB
Python
107 lines
3.3 KiB
Python
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#!/usr/bin/env python3.7
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#
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# Copyright (c) 2016-2024 by Ron Frederick <ronf@timeheart.net> and others.
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#
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# This program and the accompanying materials are made available under
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# the terms of the Eclipse Public License v2.0 which accompanies this
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# distribution and is available at:
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#
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# http://www.eclipse.org/legal/epl-2.0/
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#
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# This program may also be made available under the following secondary
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# licenses when the conditions for such availability set forth in the
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# Eclipse Public License v2.0 are satisfied:
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#
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# GNU General Public License, Version 2.0, or any later versions of
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# that license
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#
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# SPDX-License-Identifier: EPL-2.0 OR GPL-2.0-or-later
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#
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# Contributors:
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# Ron Frederick - initial implementation, API, and documentation
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# To run this program, the file ``ssh_host_key`` must exist with an SSH
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# private key in it to use as a server host key. An SSH host certificate
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# can optionally be provided in the file ``ssh_host_key-cert.pub``.
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#
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# The file ``ssh_user_ca`` must exist with a cert-authority entry of
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# the certificate authority which can sign valid client certificates.
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import asyncio, asyncssh, sys
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from typing import List, cast
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class ChatClient:
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_clients: List['ChatClient'] = []
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def __init__(self, process: asyncssh.SSHServerProcess):
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self._process = process
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@classmethod
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async def handle_client(cls, process: asyncssh.SSHServerProcess):
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await cls(process).run()
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async def readline(self) -> str:
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return cast(str, self._process.stdin.readline())
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def write(self, msg: str) -> None:
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self._process.stdout.write(msg)
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def broadcast(self, msg: str) -> None:
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for client in self._clients:
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if client != self:
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client.write(msg)
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def begin_auth(self, username: str) -> bool:
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# If the user's password is the empty string, no auth is required
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#return False
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return True # passwords.get(username) != b''
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def password_auth_supported(self) -> bool:
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return True
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def validate_password(self, username: str, password: str) -> bool:
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#if username not in passwords:
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# return False
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#pw = passwords[username]
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#if not password and not pw:
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# return True
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return True
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#return bcrypt.checkpw(password.encode('utf-8'), pw)
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async def run(self) -> None:
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self.write('Welcome to chat!\n\n')
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self.write('Enter your name: ')
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name = (await self.readline()).rstrip('\n')
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self.write(f'\n{len(self._clients)} other users are connected.\n\n')
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self._clients.append(self)
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self.broadcast(f'*** {name} has entered chat ***\n')
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try:
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async for line in self._process.stdin:
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self.broadcast(f'{name}: {line}')
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except asyncssh.BreakReceived:
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pass
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self.broadcast(f'*** {name} has left chat ***\n')
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self._clients.remove(self)
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async def start_server() -> None:
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await asyncssh.listen('', 2235, server_host_keys=['ssh_host_key'],
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process_factory=ChatClient.handle_client)
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loop = asyncio.new_event_loop()
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try:
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loop.run_until_complete(start_server())
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except (OSError, asyncssh.Error) as exc:
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sys.exit('Error starting server: ' + str(exc))
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loop.run_forever()
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