Gan, Jimmy
68 lines
2.2 KiB
Python
68 lines
2.2 KiB
Python
import asyncio
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import struct
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from fastapi import WebSocket, WebSocketDisconnect, Query
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import asyncssh
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import jwt
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import config
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async def ws_endpoint(websocket: WebSocket, token: str = Query("")):
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try:
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payload = jwt.decode(token, config.SECRET_KEY, algorithms=[config.ALGORITHM])
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if payload.get("sub") != config.ADMIN_USER:
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await websocket.close(code=1008, reason="Unauthorized")
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return
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except Exception:
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await websocket.close(code=1008, reason="Unauthorized")
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return
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await websocket.accept()
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try:
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conn = await asyncssh.connect(
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config.SSH_HOST, username=config.SSH_USER,
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client_keys=[config.SSH_KEY_PATH], known_hosts=None,
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)
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except Exception:
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await websocket.close(code=1011, reason="SSH connection failed")
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return
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try:
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process = await conn.create_process(
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term_type="xterm-256color", term_size=(80, 24),
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encoding=None,
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)
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async def read_ssh():
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try:
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while True:
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data = await process.stdout.read(4096)
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if not data:
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break
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await websocket.send_bytes(data)
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except (asyncssh.Error, WebSocketDisconnect, asyncio.CancelledError):
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pass
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read_task = asyncio.create_task(read_ssh())
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try:
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while True:
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msg = await websocket.receive()
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if "bytes" in msg and msg["bytes"]:
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data = msg["bytes"]
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if data[0:1] == b"\x01" and len(data) == 5:
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cols = struct.unpack("!H", data[1:3])[0]
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rows = struct.unpack("!H", data[3:5])[0]
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process.channel.change_terminal_size(cols, rows)
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else:
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process.stdin.write(data)
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elif "text" in msg and msg["text"]:
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process.stdin.write(msg["text"].encode())
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except WebSocketDisconnect:
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pass
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finally:
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read_task.cancel()
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process.close()
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finally:
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conn.close()
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