static string InsertRandomCharacters(string key)
{
int count = WebSocketUtil.RandomNumber(1, 12);
var randomChars = new char[count];
int randCount = 0;
while (randCount < count)
{
int rand = unchecked ((int)(WebSocketUtil.RandomNext() * 0x7e + 0x21));
if (0x21 < rand && rand < 0x2f || 0x3a < rand && rand < 0x7e)
{
randomChars[randCount] = (char)rand;
randCount += 1;
}
}
for (int i = 0; i < count; i++)
{
int split = WebSocketUtil.RandomNumber(0, key.Length);
string part1 = key.Substring(0, split);
string part2 = key.Substring(split);
key = part1 + randomChars[i] + part2;
}
return(key);
}
static string InsertSpaces(string key, int spaces)
{
for (int i = 0; i < spaces; i++)
{
int split = WebSocketUtil.RandomNumber(1, key.Length - 1);
string part1 = key.Substring(0, split);
string part2 = key.Substring(split);
key = part1 + ' ' + part2;
}
return(key);
}
protected internal override unsafe IFullHttpRequest NewHandshakeRequest()
{
// Make keys
int spaces1 = WebSocketUtil.RandomNumber(1, 12);
int spaces2 = WebSocketUtil.RandomNumber(1, 12);
int max1 = int.MaxValue / spaces1;
int max2 = int.MaxValue / spaces2;
int number1 = WebSocketUtil.RandomNumber(0, max1);
int number2 = WebSocketUtil.RandomNumber(0, max2);
int product1 = number1 * spaces1;
int product2 = number2 * spaces2;
string key1 = Convert.ToString(product1);
string key2 = Convert.ToString(product2);
key1 = InsertRandomCharacters(key1);
key2 = InsertRandomCharacters(key2);
key1 = InsertSpaces(key1, spaces1);
key2 = InsertSpaces(key2, spaces2);
byte[] key3 = WebSocketUtil.RandomBytes(8);
var challenge = new byte[16];
fixed(byte *bytes = challenge)
{
Unsafe.WriteUnaligned(bytes, number1);
Unsafe.WriteUnaligned(bytes + 4, number2);
PlatformDependent.CopyMemory(key3, 0, bytes + 8, 8);
}
this.expectedChallengeResponseBytes = Unpooled.WrappedBuffer(WebSocketUtil.Md5(challenge));
// Get path
Uri wsUrl = this.Uri;
string path = RawPath(wsUrl);
// Format request
var request = new DefaultFullHttpRequest(HttpVersion.Http11, HttpMethod.Get, path);
HttpHeaders headers = request.Headers;
headers.Add(HttpHeaderNames.Upgrade, Websocket)
.Add(HttpHeaderNames.Connection, HttpHeaderValues.Upgrade)
.Add(HttpHeaderNames.Host, WebsocketHostValue(wsUrl))
.Add(HttpHeaderNames.Origin, WebsocketOriginValue(wsUrl))
.Add(HttpHeaderNames.SecWebsocketKey1, key1)
.Add(HttpHeaderNames.SecWebsocketKey2, key2);
string expectedSubprotocol = this.ExpectedSubprotocol;
if (!string.IsNullOrEmpty(expectedSubprotocol))
{
headers.Add(HttpHeaderNames.SecWebsocketProtocol, expectedSubprotocol);
}
if (this.CustomHeaders != null)
{
headers.Add(this.CustomHeaders);
}
// Set Content-Length to workaround some known defect.
// See also: http://www.ietf.org/mail-archive/web/hybi/current/msg02149.html
headers.Set(HttpHeaderNames.ContentLength, key3.Length);
request.Content.WriteBytes(key3);
return(request);
}
