"""Bounded JSON RPC over a private Unix socket; no shell commands exposed."""
import json
import socket
import sys

SOCKET = '/run/deck/control.sock'

def request(data):
    with socket.socket(socket.AF_UNIX) as sock:
        sock.settimeout(25)
        sock.connect(SOCKET)
        sock.sendall(json.dumps(data).encode()+b'\n')
        with sock.makefile('rb') as stream:
            raw = stream.readline(65537)
        if len(raw)>65536:
            raise ValueError('Ungültige Helper-Antwort.')
        result = json.loads(raw)
        if 'error' in result and 'installed' not in result:
            raise ValueError(result['error'])
        return result

if __name__ == '__main__':
    try:
        data = json.loads(sys.stdin.buffer.readline(32769))
        print(json.dumps(request(data)))
    except Exception:
        print(json.dumps({'error':'Netzwerkaktion fehlgeschlagen. Konfiguration und Verbindung prüfen.'}))
        sys.exit(1)