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110 lines (94 loc) · 3.88 KB
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using System;
using System.Net;
using System.Net.Sockets;
using NetcodeIO.NET.Internal;
using NetcodeIO.NET.Utils;
using NetcodeIO.NET.Utils.IO;
namespace NetcodeIO.NET
{
/// <summary>
/// Helper class for generating connect tokens
/// </summary>
public class TokenFactory
{
internal ulong protocolID;
internal byte[] privateKey;
public TokenFactory(ulong protocolID, byte[] privateKey)
{
this.protocolID = protocolID;
this.privateKey = privateKey;
}
/// <summary>
/// Generate a new public connect token
/// </summary>
/// <param name="addressList">The list of public server addresses in this connect token</param>
/// <param name="expirySeconds">The number of seconds until this token expires</param>
/// <param name="sequence">The token sequence number of this token</param>
/// <param name="clientID">The unique ID to assign to the client consuming this token</param>
/// <param name="userData">Up to 256 bytes of arbitrary user data</param>
/// <returns>2048 byte connect token to send to client</returns>
public byte[] GenerateConnectToken(IPEndPoint[] addressList, int expirySeconds, ulong sequence, ulong clientID, byte[] userData)
{
if (userData.Length > 256)
{
throw new ArgumentOutOfRangeException("User data cannot be larger than 256 bytes");
}
if (addressList == null)
{
throw new NullReferenceException("Address list cannot be null");
}
else if (addressList.Length == 0)
{
throw new ArgumentOutOfRangeException("Address list cannot be empty");
}
else if (addressList.Length > Defines.MAX_SERVER_ADDRESSES)
{
throw new ArgumentOutOfRangeException("Address list cannot contain more than " + Defines.MAX_SERVER_ADDRESSES + " entries");
}
NetcodePrivateConnectToken privateConnectToken = new NetcodePrivateConnectToken();
privateConnectToken.ClientID = clientID;
// generate random crypto keys
byte[] clientToServerKey = new byte[32];
byte[] serverToClientKey = new byte[32];
KeyUtils.GenerateKey(clientToServerKey);
KeyUtils.GenerateKey(serverToClientKey);
privateConnectToken.ClientToServerKey = clientToServerKey;
privateConnectToken.ServerToClientKey = serverToClientKey;
privateConnectToken.UserData = new byte[256];
Buffer.BlockCopy(userData, 0, privateConnectToken.UserData, 0, userData.Length);
privateConnectToken.ConnectServers = new ConnectTokenServerEntry[addressList.Length];
for (int i = 0; i < privateConnectToken.ConnectServers.Length; i++)
{
privateConnectToken.ConnectServers[i] = new ConnectTokenServerEntry()
{
AddressType = addressList[i].AddressFamily == AddressFamily.InterNetwork ? NetcodeAddressType.IPv4 : NetcodeAddressType.IPv6,
Endpoint = addressList[i]
};
}
byte[] privateConnectTokenBytes = new byte[1024];
using (var writer = ByteArrayReaderWriter.Get(privateConnectTokenBytes))
{
privateConnectToken.Write(writer);
}
ulong createTimestamp = DateTime.Now.ToUnixTimestamp();
ulong expireTimestamp = createTimestamp + (ulong)expirySeconds;
byte[] encryptedPrivateToken = new byte[1024];
PacketIO.EncryptPrivateConnectToken(privateConnectTokenBytes, protocolID, expireTimestamp, sequence, privateKey, encryptedPrivateToken);
NetcodePublicConnectToken publicToken = new NetcodePublicConnectToken();
publicToken.ProtocolID = protocolID;
publicToken.CreateTimestamp = createTimestamp;
publicToken.ConnectTokenSequence = sequence;
publicToken.PrivateConnectTokenBytes = encryptedPrivateToken;
publicToken.ConnectServers = privateConnectToken.ConnectServers;
publicToken.ClientToServerKey = clientToServerKey;
publicToken.ServerToClientKey = serverToClientKey;
publicToken.TimeoutSeconds = (uint)expirySeconds;
byte[] publicTokenBytes = new byte[2048];
using (var writer = ByteArrayReaderWriter.Get(publicTokenBytes))
{
publicToken.Write(writer);
}
return publicTokenBytes;
}
}
}