O2jam Server | 95% CERTIFIED |

class O2JamProtocol(asyncio.Protocol): def connection_made(self, transport): self.transport = transport self.peername = transport.get_extra_info('peername') print(f"Connected: self.peername") self.buffer = b""

def handle_packet(self, cmd, payload): if cmd == 0x01: # Login user, pw = payload.decode().split(':', 1) if users.get(user, {}).get("password") == pw: session = hashlib.md5(f"userpw".encode()).hexdigest()[:16] users[user]["session"] = session self.send_packet(0x81, session.encode()) else: self.send_packet(0x81, b"FAIL") elif cmd == 0x02: # Request song list song_data = json.dumps(songs).encode() self.send_packet(0x82, song_data) elif cmd == 0x03: # Submit score # payload: song_id:int, accuracy:float, max_combo:int, judgment_counts:... parts = payload.split(b',') song_id = int(parts[0]) score = int(parts[1]) # total score acc = float(parts[2]) player = self.get_session_user(payload) # simplified song_rankings[song_id].append((score, player, acc)) song_rankings[song_id].sort(reverse=True) song_rankings[song_id] = song_rankings[song_id][:100] # keep top 100 self.send_packet(0x83, b"OK") elif cmd == 0x04: # Request ranking song_id = int(payload) rank_list = song_rankings[song_id][:10] resp = json.dumps(rank_list).encode() self.send_packet(0x84, resp) else: print(f"Unknown cmd: cmd")

To implement an feature, you typically need to simulate the original game server behavior: handle login, song selection, score submission, ranking, and possibly multiplayer room synchronization. o2jam server

def send(cmd, data=b""): writer.write(struct.pack("!BH", cmd, len(data)) + data)

def get_session_user(self, payload): # In real scenario, extract session token from packet for u, info in users.items(): if info["session"] and info["session"] in str(payload): return u return None class O2JamProtocol(asyncio

def hash_password(pw): return hashlib.md5(pw.encode()).hexdigest()

# Request songs send(0x02) songs_data = await reader.read(4096) print("Song list:", songs_data) pw = payload.decode().split(':'

song_rankings = defaultdict(list) # song_id: [(score, player, accuracy), ...]