static string CreateRandomKey()
{
byte[] seed = new byte[4];
NetContext.GetRandomBytes(seed);
Random rand = new Random(BitConverter.ToInt32(seed, 0));
// 16. Let /spaces_1/ be a random integer from 1 to 12 inclusive.
int spaces = rand.Next(1, 13);
// 17. Let /max_1/ be the largest integer not greater than
// 4,294,967,295 divided by /spaces_1/.
int max = int.MaxValue / spaces; // note using int.MaxValue for convenience
// 18. Let /number_1/ be a random integer from 0 to /max_1/ inclusive.
int number = rand.Next(0, max);
//19. Let /product_1/ be the result of multiplying /number_1/ and
// /spaces_1/ together.
ulong product = (ulong)number * (ulong)spaces;
//20. Let /key_1/ be a string consisting of /product_1/, expressed in
//base ten using the numerals in the range U+0030 DIGIT ZERO (0)
//to U+0039 DIGIT NINE (9).
var key = new StringBuilder().Append(product);
//21. Insert between one and twelve random characters from the ranges
//U+0021 to U+002F and U+003A to U+007E into /key_1/ at random
//positions.
int charsToAdd = rand.Next(1, 13);
for (int i = 0; i < charsToAdd; i++)
{
int val = rand.Next(82);
char c = (char)(val + val < 14 ? 0x21 : 0x3a);
key.Insert(rand.Next(key.Length), c);
}
// 22. Insert /spaces_1/ U+0020 SPACE characters into /key_1/ at random
// positions other than the start or end of the string.
for (int i = 0; i < spaces; i++)
{
key.Insert(rand.Next(1, key.Length - 1), ' ');
}
return(key.ToString());
}
protected override void InitializeClientHandshake(NetContext context, Connection conn)
{
var connection = (WebSocketConnection)conn;
if (string.IsNullOrEmpty(connection.Host))
{
throw new InvalidOperationException("Host must be specified");
}
if (string.IsNullOrEmpty(connection.RequestLine))
{
throw new InvalidOperationException("RequestLine must be specified");
}
string key1 = CreateRandomKey(), key2 = CreateRandomKey();
byte[] key3 = new byte[8];
NetContext.GetRandomBytes(key3);
StringBuilder req = new StringBuilder(connection.RequestLine).Append("\r\n" +
"Upgrade: WebSocket\r\n" + // note casing!
"Connection: Upgrade\r\n" +
"Sec-WebSocket-Key1: ").Append(key1).Append("\r\n" +
"Sec-WebSocket-Key2: ").Append(key2).Append("\r\n" +
"Host: ").Append(connection.Host).Append("\r\n");
if (!string.IsNullOrEmpty(connection.Origin))
{
req.Append("Origin: ").Append(connection.Origin).Append("\r\n");
}
if (!string.IsNullOrEmpty(connection.Protocol))
{
req.Append("Sec-WebSocket-Protocol: ").Append(connection.Protocol).Append("\r\n");
}
req.Append("\r\n");
expectedSecurityResponse = WebSocketsProcessor_Hixie76_00.ComputeKey(key1, key2, key3);
EnqueueFrame(context, new StringFrame(req.ToString(), Encoding.ASCII, false));
EnqueueFrame(context, new BinaryFrame(key3));
connection.PromptToSend(context);
}
static int CreateMask()
{
byte[] mask = new byte[4];
NetContext.GetRandomBytes(mask);
return(BitConverter.ToInt32(mask, 0));
}
protected override void InitializeClientHandshake(NetContext context, Connection conn)
{
var connection = (WebSocketConnection)conn;
byte[] nonce = new byte[16];
NetContext.GetRandomBytes(nonce);
var outgoing = Convert.ToBase64String(nonce);
expected = WebSocketsProcessor_RFC6455_13.ComputeReply(context, outgoing);
if (string.IsNullOrEmpty(connection.Host))
{
throw new InvalidOperationException("Host must be specified");
}
if (string.IsNullOrEmpty(connection.RequestLine))
{
throw new InvalidOperationException("RequestLine must be specified");
}
StringBuilder req = new StringBuilder(connection.RequestLine).Append("\r\n" +
"Upgrade: websocket\r\n" +
"Connection: Upgrade\r\n" +
"Sec-WebSocket-Version: 13\r\n" +
"Sec-WebSocket-Key: ").Append(outgoing).Append("\r\n" +
"Host: ").Append(connection.Host).Append("\r\n");
if (!string.IsNullOrEmpty(connection.Origin))
{
req.Append("Origin: ").Append(connection.Origin).Append("\r\n");
}
if (!string.IsNullOrEmpty(connection.Protocol))
{
req.Append("Sec-WebSocket-Protocol: ").Append(connection.Protocol).Append("\r\n");
}
var extnArray = context.Extensions;
if (extnArray != null && extnArray.Length != 0)
{
List <string> extnHeaders = null;
for (int i = 0; i < extnArray.Length; i++)
{
var extn = extnArray[i] as IExtensionFactory;
if (extn != null)
{
string extnHeader = extn.GetRequestHeader();
if (!string.IsNullOrEmpty(extnHeader))
{
if (extnHeaders == null)
{
extnHeaders = new List <string>();
}
extnHeaders.Add(extnHeader);
}
}
}
if (extnHeaders != null)
{
req.Append("Sec-WebSocket-Extensions: ").Append(extnHeaders[0]);
for (int i = 1; i < extnHeaders.Count; i++)
{
req.Append(", ").Append(extnHeaders[i]);
}
req.Append("\r\n");
}
}
req.Append("\r\n");
EnqueueFrame(context, new StringFrame(req.ToString(), Encoding.ASCII));
connection.PromptToSend(context);
}