/// <summary>
/// Called when a new web socket connection has been established.
/// </summary>
/// <param name="webSocketContext">The web socket context.</param>
public async override Task WebSocketContext(AspNetWebSocketContext webSocketContext)
{
byte[] store = null;
byte[] receiveBuffer = null;
WebSocket webSocket = null;
WebSocketClient wsClient = null;
TimeoutModel tmConnection = null;
TimeoutModel tmExpiry = null;
try
{
// Get the web socket ref.
webSocket = webSocketContext.WebSocket;
// Random GUID
string clientGUID = Guid.NewGuid().ToString();
wsClient = new WebSocketClient()
{
UniqueID = clientGUID,
ApplicationID = clientGUID,
Available = false,
Broadcast = false,
BroadcastAppID = false,
HasAccess = false,
AccessToken = null
};
// Set the buffer.
store = new byte[0];
CancellationTokenSource receiveCancelToken = new CancellationTokenSource();
// Connection timeout.
tmConnection = new TimeoutModel()
{
Client = wsClient,
Socket = webSocket,
Start = DateTime.Now,
Timeout = new TimeSpan(0, 0, (int)Global.ClientTimeoutConnect),
ReceiveCancelToken = receiveCancelToken
};
// Add the client to the collection.
bool itemAdded = Global.Clients.TryAdd(wsClient, webSocket);
// If a connect timeout exists.
if ((int)Global.ClientTimeoutConnect > 0)
{
// Add timeout connect handler.
Global.Timeout.Register(tmConnection, (c, w) => ConnectTimeoutActionHandler(c, w));
}
// While the WebSocket connection remains open run a
// simple loop that receives data and sends it back.
while (webSocket.State == WebSocketState.Open)
{
receiveBuffer = null;
receiveBuffer = new byte[16384];
// Receive the next set of data.
ArraySegment <byte> arrayBuffer = new ArraySegment <byte>(receiveBuffer);
WebSocketReceiveResult receiveResult = await webSocket.ReceiveAsync(arrayBuffer, receiveCancelToken.Token);
// If the connection has been closed.
if (receiveResult.MessageType == WebSocketMessageType.Close)
{
// Exit the loop
break;
}
else
{
// If a message exists.
if (receiveResult.Count > 0)
{
// If text.
if (receiveResult.MessageType == WebSocketMessageType.Text)
{
// If this is the end of the message.
if (receiveResult.EndOfMessage)
{
// Get the number of bytes sent.
byte[] received = receiveBuffer.Take(receiveResult.Count).ToArray();
// Get the complete message.
byte[] completeMessage = null;
completeMessage = store.CombineParallel(received);
string message = System.Text.Encoding.ASCII.GetString(completeMessage);
// If requesting application IDs.
if (message == "applicationids")
{
// If no access.
if (!wsClient.HasAccess)
{
// Send a message back.
byte[] sendBuffer = System.Text.Encoding.ASCII.GetBytes("{\"response\":\"error\",\"error\":\"Access Denied\"}");
await webSocket.SendAsync(new ArraySegment <byte>(sendBuffer),
WebSocketMessageType.Text, true, CancellationToken.None);
continue;
}
// If requesting application IDs.
string listText = "";
// For each client.
try
{
// Get a copy of all clients.
var copyAllClients = Global.Clients.ToArray();
for (int i = 0; i < copyAllClients.Length; i++)
{
var u = copyAllClients[i];
// If can braodcast.
if (u.Key.BroadcastAppID)
{
// Add each client.
listText += "{\"application\":\"" + u.Key.ApplicationID + "\"},";
}
}
// Trim end.
string listTextTrimed = listText.TrimEnd(new char[] { ',' });
// Send to client
byte[] sendBuffer = System.Text.Encoding.ASCII.GetBytes("{\"response\":\"ok\",\"applications\":[" + listTextTrimed + "]}");
await webSocket.SendAsync(new ArraySegment <byte>(sendBuffer),
WebSocketMessageType.Text, true, CancellationToken.None);
}
catch { }
}
else if (message == "uniqueids")
{
// If no access.
if (!wsClient.HasAccess)
{
// Send a message back.
byte[] sendBuffer = System.Text.Encoding.ASCII.GetBytes("{\"response\":\"error\",\"error\":\"Access Denied\"}");
await webSocket.SendAsync(new ArraySegment <byte>(sendBuffer),
WebSocketMessageType.Text, true, CancellationToken.None);
continue;
}
// If requesting unique IDs.
string listText = "";
// For each client.
try
{
// Get a copy of all clients.
var copyAllClients = Global.Clients.ToArray();
for (int i = 0; i < copyAllClients.Length; i++)
{
var u = copyAllClients[i];
// If can braodcast.
if (u.Key.Broadcast)
{
// Add each client.
listText += "{\"unique\":\"" + u.Key.UniqueID + "\"},";
}
}
// Trim end.
string listTextTrimed = listText.TrimEnd(new char[] { ',' });
// Send to client
byte[] sendBuffer = System.Text.Encoding.ASCII.GetBytes("{\"response\":\"ok\",\"uniques\":[" + listTextTrimed + "]}");
await webSocket.SendAsync(new ArraySegment <byte>(sendBuffer),
WebSocketMessageType.Text, true, CancellationToken.None);
}
catch { }
}
else if (message == "uniqueapplication")
{
// If no access.
if (!wsClient.HasAccess)
{
// Send a message back.
byte[] sendBuffer = System.Text.Encoding.ASCII.GetBytes("{\"response\":\"error\",\"error\":\"Access Denied\"}");
await webSocket.SendAsync(new ArraySegment <byte>(sendBuffer),
WebSocketMessageType.Text, true, CancellationToken.None);
continue;
}
// If requesting unique and application group pair.
string listText = "";
// For each client.
try
{
// Get a copy of all clients.
var copyAllClients = Global.Clients.ToArray();
for (int i = 0; i < copyAllClients.Length; i++)
{
var u = copyAllClients[i];
// If can braodcast.
if (u.Key.BroadcastAppID && u.Key.Broadcast)
{
// Add each client.
listText += "{\"unique\":\"" + u.Key.UniqueID + "\",\"application\":\"" + u.Key.ApplicationID + "\"},";
}
}
// Trim end.
string listTextTrimed = listText.TrimEnd(new char[] { ',' });
// Send to client
byte[] sendBuffer = System.Text.Encoding.ASCII.GetBytes("{\"response\":\"ok\",\"groups\":[" + listTextTrimed + "]}");
await webSocket.SendAsync(new ArraySegment <byte>(sendBuffer),
WebSocketMessageType.Text, true, CancellationToken.None);
}
catch { }
}
else
{
try
{
// Get the JSON data.
JsonGenerator gen = new JsonGenerator(message);
gen.Namespace = "Lake.WebSocketServer";
gen.RootClassName = "RootWebSocketData";
var extract = gen.Extract();
// Search for the contact.
bool foundContact = false;
var contact = gen.GetContactData(out foundContact);
// Search for the client.
bool foundClient = false;
var client = gen.GetClientData(out foundClient);
// Then change the client details.
if (foundClient)
{
// Change.
wsClient.UniqueID = client.UniqueID;
wsClient.ApplicationID = client.ApplicationID;
wsClient.Available = client.Available;
wsClient.Broadcast = client.Broadcast;
wsClient.BroadcastAppID = client.BroadcastAppID;
wsClient.AccessToken = client.AccessToken;
// If nothing has been sent.
if (String.IsNullOrEmpty(client.UniqueID) || String.IsNullOrEmpty(client.ApplicationID))
{
// Send to client
byte[] sendBufferNoData = System.Text.Encoding.ASCII.GetBytes("{\"response\":\"ok\",\"settings\":false}");
await webSocket.SendAsync(new ArraySegment <byte>(sendBufferNoData),
WebSocketMessageType.Text, true, CancellationToken.None);
continue;
}
// Send to client
byte[] sendBuffer = System.Text.Encoding.ASCII.GetBytes("{\"response\":\"ok\",\"settings\":true}");
await webSocket.SendAsync(new ArraySegment <byte>(sendBuffer),
WebSocketMessageType.Text, true, CancellationToken.None);
// If no access.
if (!wsClient.HasAccess)
{
try
{
// Make a connection to the access token verification service.
using (HttpClient httpClient = new HttpClient())
{
// Add header with access token.
string authValueBearer = "Bearer ";
string authValueToken = wsClient.AccessToken;
string authValue = authValueBearer + authValueToken;
httpClient.DefaultRequestHeaders.Add("Authorization", authValue);
httpClient.DefaultRequestHeaders.Add("UniqueID", wsClient.UniqueID);
httpClient.DefaultRequestHeaders.Add("ApplicationID", wsClient.ApplicationID);
// Verify the access token for the client.
HttpResponseMessage response = await httpClient.GetAsync(new Uri(Global.AccessTokenVerifyURL));
if (response.IsSuccessStatusCode)
{
// Get the json response.
string jsonData = await response.Content.ReadAsStringAsync();
// Get the JSON data.
JsonGenerator genAccess = new JsonGenerator(jsonData);
genAccess.Namespace = "Lake.WebSocketServer";
genAccess.RootClassName = "RootWebSocketData";
var extractAccess = genAccess.Extract();
// Search for the access token.
bool foundAccessToken = false;
var accessToken = genAccess.GetAccessTokenData(out foundAccessToken);
// If the access token has been found.
if (foundAccessToken)
{
// Has access.
bool hasAccess = accessToken.Grant;
if (hasAccess)
{
// Should the uniqueid be matched with what is in the returned token
// and what was entered by the user.
if (accessToken.UniqueIDMatch)
{
// If not the same.
if (accessToken.UniqueID != wsClient.UniqueID)
{
// No access is allowed.
hasAccess = false;
}
}
}
// Grant or not.
wsClient.HasAccess = hasAccess;
if (hasAccess)
{
try
{
// Expiry timeout.
tmExpiry = new TimeoutModel()
{
Client = wsClient,
Socket = webSocket,
Start = DateTime.Now,
Timeout = new TimeSpan(0, (int)accessToken.Expiry, 0),
ReceiveCancelToken = receiveCancelToken
};
// If an expiry exists.
if (accessToken.Expiry > 0)
{
// Add timeout connect handler.
Global.Timeout.Register(tmExpiry, (c, w) => ExpiryTimeoutActionHandler(c, w));
}
// Remove connection timeout.
// The client has access.
Global.Timeout.Unregister(tmConnection);
}
catch { }
}
}
}
}
}
catch (Exception)
{
// Send a message back.
byte[] sendBufferNoAccess = System.Text.Encoding.ASCII.GetBytes("{\"response\":\"error\",\"error\":\"Unable to grant access\"}");
await webSocket.SendAsync(new ArraySegment <byte>(sendBufferNoAccess),
WebSocketMessageType.Text, true, CancellationToken.None);
try
{
// Send close the connection.
await webSocket.CloseAsync(WebSocketCloseStatus.NormalClosure, "Unable to grant access", CancellationToken.None);
}
catch { }
}
}
}
else
{
// If no access.
if (!wsClient.HasAccess)
{
// Send a message back.
byte[] sendBuffer = System.Text.Encoding.ASCII.GetBytes("{\"response\":\"error\",\"error\":\"Access Denied\"}");
await webSocket.SendAsync(new ArraySegment <byte>(sendBuffer),
WebSocketMessageType.Text, true, CancellationToken.None);
continue;
}
// If contact details have been sent.
if (foundContact)
{
try
{
// Contact;
bool contactMatchFound = false;
bool contactAvailable = false;
KeyValuePair <WebRTCSocket.WebSocketClient, WebSocket>
contactMatch = new KeyValuePair <WebSocketClient, WebSocket>();
try
{
// Get a copy of all clients.
var copyAllClients = Global.Clients.ToArray();
for (int i = 0; i < copyAllClients.Length; i++)
{
var u = copyAllClients[i];
if ((u.Key.UniqueID == contact.UniqueID) &&
(u.Key.ApplicationID == contact.ApplicationID))
{
// Found, contact is also found is available.
contactMatchFound = true;
contactAvailable = u.Key.Available;
contactMatch = u;
break;
}
}
}
catch (Exception)
{
// No match.
contactMatchFound = false;
}
// If the contact has been found and is available.
if (contactMatchFound && contactAvailable)
{
// Send to client
byte[] sendBuffer = System.Text.Encoding.ASCII.GetBytes("{\"response\":\"ok\",\"available\":true}");
await webSocket.SendAsync(new ArraySegment <byte>(sendBuffer),
WebSocketMessageType.Text, true, CancellationToken.None);
// Replace the contact properties.
gen.Replace(new JsonNameValue[]
{
new WebRTCSocket.JsonNameValue()
{
Name = "contactUniqueID", Value = wsClient.UniqueID
},
new WebRTCSocket.JsonNameValue()
{
Name = "contactApplicationID", Value = wsClient.ApplicationID
}
});
// Add the response.
gen.Create(new JsonNameValue[]
{
new WebRTCSocket.JsonNameValue()
{
Name = "response", Value = "ok"
},
new WebRTCSocket.JsonNameValue()
{
Name = "available", Value = true
}
});
extract = gen.Extract();
var jsonDataNew = gen.GetJson();
byte[] sendBufferContact = System.Text.Encoding.ASCII.GetBytes(jsonDataNew);
// Send the client data to the contact.
await contactMatch.Value.SendAsync(new ArraySegment <byte>(sendBufferContact),
WebSocketMessageType.Text, true, CancellationToken.None);
}
else
{
// If the contact has been found and is not available.
if (contactMatchFound && !contactAvailable)
{
// Send to client
byte[] sendBuffer = System.Text.Encoding.ASCII.GetBytes("{\"response\":\"ok\",\"available\":false}");
await webSocket.SendAsync(new ArraySegment <byte>(sendBuffer),
WebSocketMessageType.Text, true, CancellationToken.None);
}
else
{
// Indicate to the client that we are searching.
byte[] sendBuffer = System.Text.Encoding.ASCII.GetBytes("{\"response\":\"error\",\"error\":\"No contacts, searching\"}");
await webSocket.SendAsync(new ArraySegment <byte>(sendBuffer),
WebSocketMessageType.Text, true, CancellationToken.None);
// If broadcast enabled.
if (Global.UdpBroadcastEnabled)
{
// The contact has not been found.
// Broadcast to servers asking where
// this contact is located.
// Add the response.
gen.Create(new JsonNameValue[]
{
new WebRTCSocket.JsonNameValue()
{
Name = "response", Value = "ok"
},
new WebRTCSocket.JsonNameValue()
{
Name = "available", Value = false
},
new WebRTCSocket.JsonNameValue()
{
Name = "error", Value = ""
},
new WebRTCSocket.JsonNameValue()
{
Name = "serverID", Value = Global.ServerID
},
new WebRTCSocket.JsonNameValue()
{
Name = "uniqueID", Value = wsClient.UniqueID
},
new WebRTCSocket.JsonNameValue()
{
Name = "applicationID", Value = wsClient.ApplicationID
}
});
// Get the new JSON data.
extract = gen.Extract();
var jsonDataNew = gen.GetJson();
// Broadcast.
Global.UdpSocket.Broadcast(jsonDataNew, Global.UdpBroadcastAddress, Global.UdpBroadcastMask, wsClient, contact);
}
}
}
}
catch
{
// Send to client
byte[] sendBuffer = System.Text.Encoding.ASCII.GetBytes("{\"response\":\"error\",\"error\":\"No contacts, searching\"}");
await webSocket.SendAsync(new ArraySegment <byte>(sendBuffer),
WebSocketMessageType.Text, true, CancellationToken.None);
}
}
}
}
catch
{
// Send to client
byte[] sendBuffer = System.Text.Encoding.ASCII.GetBytes("{\"response\":\"error\",\"error\":\"Unable to read request\"}");
await webSocket.SendAsync(new ArraySegment <byte>(sendBuffer),
WebSocketMessageType.Text, true, CancellationToken.None);
}
}
store = null;
received = null;
store = new byte[0];
completeMessage = null;
}
else
{
// Get the number of bytes sent.
byte[] received = receiveBuffer.Take(receiveResult.Count).ToArray();
// Store the data until the
// end of the message.
byte[] temp = null;
temp = store.CombineParallel(received);
// Store the data until the end.
store = temp;
temp = null;
received = null;
}
}
else
{
// Exit the loop
break;
}
}
}
}
// Cancel the receive request.
if (webSocket.State != WebSocketState.Open)
{
// Cancel the receive request.
receiveCancelToken.Cancel();
}
}
catch (Exception) { }
finally
{
// Clean-up connection timeout.
if (tmConnection != null)
{
try
{
// Remove connection timeout.
Global.Timeout.Unregister(tmConnection);
}
catch { }
}
// Clean-up expiry timeout.
if (tmExpiry != null)
{
try
{
// Remove connection timeout.
Global.Timeout.Unregister(tmExpiry);
}
catch { }
}
// Clean up by disposing the WebSocket client.
if (wsClient != null)
{
try
{
// Remove the client from the list.
Global.Clients.TryRemove(wsClient, out webSocket);
}
catch { }
}
// Clean up by disposing the WebSocket.
if (webSocket != null)
{
try
{
// Abort the operation.
webSocket.Abort();
}
catch { }
}
store = null;
receiveBuffer = null;
webSocket = null;
wsClient = null;
tmConnection = null;
tmExpiry = null;
}
}
/// <summary>
/// Broadcast to subnet (e.g. IPAddress 192.168.1.10 with SubnetMask 255.255.0.0 will result
/// in sending to all hosts with IPAddress 192.168.0.1 to 192.168.254.254).
/// </summary>
/// <param name="data">The data to send.</param>
/// <param name="baseIPAddress">The base IP address (e.g. 192.168.1.10)</param>
/// <param name="IPSubnetMask">The subnet-mask to apply on the IP address (e.g. 255.255.0.0)</param>
/// <param name="wsClient">The WebSocket client.</param>
/// <param name="wsContact">The WebSocket contact.</param>
public async void Broadcast(string data, string baseIPAddress, string IPSubnetMask, WebSocketClient wsClient, WebSocketContact wsContact)
{
// If started.
if (_started && _enabled)
{
string udpAddress = baseIPAddress;
string udpMask = IPSubnetMask;
// If client location request enabled.
if (Global.ClientLocationRequestEnabled)
{
try
{
// Make a connection to the access token verification service.
using (HttpClient httpClient = new HttpClient())
{
// Add header with access token.
string authValueBearer = "Bearer ";
string authValueToken = wsClient.AccessToken;
string authValue = authValueBearer + authValueToken;
httpClient.DefaultRequestHeaders.Add("Authorization", authValue);
httpClient.DefaultRequestHeaders.Add("UniqueID", wsClient.UniqueID);
httpClient.DefaultRequestHeaders.Add("ApplicationID", wsClient.ApplicationID);
httpClient.DefaultRequestHeaders.Add("ContactUniqueID", wsContact.UniqueID);
httpClient.DefaultRequestHeaders.Add("ContactApplicationID", wsContact.ApplicationID);
// Verify the access token for the client.
HttpResponseMessage response = await httpClient.GetAsync(new Uri(Global.ClientLocationRequestURL));
if (response.IsSuccessStatusCode)
{
// Get the json response.
string jsonData = await response.Content.ReadAsStringAsync();
// Get the JSON data.
JsonGenerator genAccess = new JsonGenerator(jsonData);
genAccess.Namespace = "Lake.WebSocketServer";
genAccess.RootClassName = "RootWebSocketData";
var extractAccess = genAccess.Extract();
// Search for the client loaction.
bool foundClientLocation = false;
var clientLocation = genAccess.GetClientLocation(out foundClientLocation);
// If the client location has been found.
if (foundClientLocation)
{
udpAddress = clientLocation.Address;
udpMask = clientLocation.Mask;
}
}
}
}
catch { }
}
// Open the client.
using (UdpClient client = new UdpClient())
{
// Enable broadcasting.
client.EnableBroadcast = true;
// If either is empty.
if (String.IsNullOrEmpty(udpAddress) || String.IsNullOrEmpty(udpMask))
{
// If data exists.
if (!String.IsNullOrEmpty(data))
{
// Broadcast to all.
byte[] toSent = System.Text.Encoding.ASCII.GetBytes(data);
try
{
// Sent the message.
IPEndPoint endPointAll = new IPEndPoint(IPAddress.Broadcast, _broadcastListenerPort);
int sent = await client.SendAsync(toSent, toSent.Length, endPointAll);
}
catch { }
}
}
else
{
// Get the IP address.
IPAddress address = null;
bool isIP = IPAddress.TryParse(udpAddress, out address);
// Get the subnet mask.
IPAddress mask = null;
bool isIPMask = IPAddress.TryParse(udpMask, out mask);
// If both are valid.
if (isIP && isIPMask)
{
// If data exists.
if (!String.IsNullOrEmpty(data))
{
// Broadcast to all.
byte[] toSent = System.Text.Encoding.ASCII.GetBytes(data);
try
{
// Broadcast to subnet.
IPAddress broadcast = GetBroadcastAddress(address, mask);
IPEndPoint endPointSub = new IPEndPoint(broadcast, _broadcastListenerPort);
int sent = await client.SendAsync(toSent, toSent.Length, endPointSub);
}
catch { }
}
}
}
}
}
}
/// <summary>
/// Get the client data.
/// </summary>
/// <param name="found">True if found; else false.</param>
/// <returns>The client data.</returns>
public WebSocketClient GetClientData(out bool found)
{
found = false;
WebSocketClient client = new WebSocketClient();
try
{
// Get the list.
foreach (JsonType item in _types)
{
// For each field.
foreach (JsonFieldInfo field in item.Fields)
{
// If found contact unique id.
if (field.JsonMemberName == "uniqueID")
{
found = true;
client.UniqueID = field.Jobjects[0].ToString();
}
// If found contact application id.
if (field.JsonMemberName == "applicationID")
{
found = true;
client.ApplicationID = field.Jobjects[0].ToString();
}
// If found contact available.
if (field.JsonMemberName == "available")
{
found = true;
bool available = false;
if (Boolean.TryParse(field.Jobjects[0].ToString(), out available))
{
client.Available = available;
}
}
// If found contact broadcast.
if (field.JsonMemberName == "broadcast")
{
found = true;
bool broadcast = false;
if (Boolean.TryParse(field.Jobjects[0].ToString(), out broadcast))
{
client.Broadcast = broadcast;
}
}
// If found contact broadcastAppID.
if (field.JsonMemberName == "broadcastAppID")
{
found = true;
bool broadcastAppID = false;
if (Boolean.TryParse(field.Jobjects[0].ToString(), out broadcastAppID))
{
client.BroadcastAppID = broadcastAppID;
}
}
// If found access token.
if (field.JsonMemberName == "accessToken")
{
found = true;
client.AccessToken = field.Jobjects[0].ToString();
}
}
}
}
catch { }
// Return the client.
return(client);
}
