/// <summary>
/// 设置握手结果
/// </summary>
/// <param name="streamReader">数据读取器</param>
/// <returns></returns>
public bool TrySetResult(ISessionStreamReader streamReader)
{
streamReader.Position = 0;
var index = streamReader.IndexOf(DoubleCrlf);
if (index < 0)
{
return(false);
}
var length = index + DoubleCrlf.Length;
var header = streamReader.ReadString(Encoding.ASCII, length);
streamReader.Clear(length);
const string pattern = @"^HTTP/1.1 101 Switching Protocols\r\n((?<field_name>[^:\r\n]+):\s(?<field_value>[^\r\n]*)\r\n)+\r\n";
var match = Regex.Match(header, pattern, RegexOptions.IgnoreCase);
if (match.Success == true)
{
var httpHeader = HttpHeader.Parse(match.Groups["field_name"].Captures, match.Groups["field_value"].Captures);
var secAccept = httpHeader["Sec-WebSocket-Accept"];
const string guid = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
var bytes = SHA1.Create().ComputeHash(Encoding.UTF8.GetBytes(this.secKey + guid));
var secValue = Convert.ToBase64String(bytes);
if (secValue == secAccept)
{
return(this.TrySetResult(SocketError.Success));
}
}
return(this.TrySetResult(SocketError.SocketError));
}
/// <summary>
/// 设置握手结果
/// </summary>
/// <param name="streamReader">数据读取器</param>
/// <returns></returns>
public bool TrySetResult(ISessionStreamReader streamReader)
{
var result = HttpResponseParser.Parse(streamReader);
if (result.IsHttp == false)
{
return(false);
}
else
{
streamReader.Clear();
}
if (result.Status == 101)
{
const string guid = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
var bytes = SHA1.Create().ComputeHash(Encoding.UTF8.GetBytes(this.secKey + guid));
var secValue = Convert.ToBase64String(bytes);
var secAccept = result.Header["Sec-WebSocket-Accept"];
if (secValue == secAccept)
{
return(this.TrySetResult(SocketError.Success));
}
}
return(this.TrySetResult(SocketError.SocketError));
}
/// <summary>
/// 解析一个数据包
/// 不足一个封包时返回null
/// </summary>
/// <param name="streamReader">数据读取器</param>
/// <param name="packet">数据包</param>
/// <returns></returns>
public static bool Parse(ISessionStreamReader streamReader, out FastPacket packet)
{
packet = null;
const int packetMinSize = 16;
if (streamReader.Length < packetMinSize || streamReader[0] != FastPacket.Mark)
{
return(false);
}
streamReader.Position = 1;
var totalBytes = streamReader.ReadInt32();
if (totalBytes < packetMinSize)
{
return(false);
}
// 数据包未接收完整
if (streamReader.Length < totalBytes)
{
return(true);
}
// api名称数据长度
var apiNameLength = streamReader.ReadByte();
if (totalBytes < apiNameLength + packetMinSize)
{
return(false);
}
// api名称数据
var apiNameBytes = streamReader.ReadArray(apiNameLength);
// 标识符
var id = streamReader.ReadInt64();
// 是否为客户端封包
var isFromClient = streamReader.ReadBoolean();
// 是否异常
var isException = streamReader.ReadBoolean();
// 实体数据
var body = streamReader.ReadArray(totalBytes - streamReader.Position);
// 清空本条数据
streamReader.Clear(totalBytes);
var apiName = Encoding.UTF8.GetString(apiNameBytes);
packet = new FastPacket(apiName, id, isFromClient)
{
TotalBytes = totalBytes,
ApiNameLength = apiNameLength,
IsException = isException,
Body = body
};
return(true);
}
/// <summary>
/// 解析一个数据包
/// 不足一个封包时packet返回null
/// 中间件不符合则返回false
/// </summary>
/// <param name="session">会话</param>
/// <param name="packet">数据包</param>
/// <returns></returns>
public virtual bool Parse(ISessionStreamReader streamReader, ISession session, out string packet)
{
packet = null;
try
{
int required = 28;
int remain = session.RemainDataLength;//剩余长度
while (remain >= required)
{
// 实体数据
packet = Encoding.UTF8.GetString(streamReader.ReadArray(required));
// 清空本条数据
streamReader.Clear(required);
return(true);
}
return(true);
}
catch (Exception)
{
return(false);
}
}
/// <summary>
/// 解析请求的数据
/// 返回请求数据包
/// </summary>
/// <param name="streamReader">数据读取器</param>
/// <param name="requiredMask">是否要求必须Mask</param>
/// <exception cref="NotSupportedException"></exception>
/// <returns></returns>
public unsafe static FrameRequest Parse(ISessionStreamReader streamReader, bool requiredMask = true)
{
if (streamReader.Length < 2)
{
return(null);
}
ByteBits byte0 = streamReader[0];
var fin = byte0[0];
var rsv = byte0.Take(1, 3);
var frameCode = (FrameCodes)(byte)byte0.Take(4, 4);
ByteBits byte1 = streamReader[1];
var mask = byte1[0];
if (requiredMask && mask == false)
{
throw new NotSupportedException("mask is required");
}
if (Enum.IsDefined(typeof(FrameCodes), frameCode) == false || rsv != 0)
{
throw new NotSupportedException();
}
var contentSize = 0;
var contentLength = (int)byte1.Take(1, 7);
streamReader.Position = 2;
if (contentLength == 127)
{
contentSize = 8;
contentLength = (int)streamReader.ReadUInt64();
}
else if (contentLength == 126)
{
contentSize = 2;
contentLength = (int)streamReader.ReadUInt16();
}
var maskSize = mask ? 4 : 0;
var packetLength = 2 + maskSize + contentSize + contentLength;
if (streamReader.Length < packetLength)
{
return(null);
}
var maskingKey = mask ? streamReader.ReadArray(4) : null;
var content = streamReader.ReadArray(contentLength);
streamReader.Clear(packetLength);
if (mask && contentLength > 0)
{
fixed(byte *pcontent = &content[0], pmask = &maskingKey[0])
{
for (var i = 0; i < contentLength; i++)
{
*(pcontent + i) = (byte)(*(pcontent + i) ^ *(pmask + i % 4));
}
}
}
return(new FrameRequest
{
Fin = fin,
Rsv = rsv,
Mask = mask,
Frame = frameCode,
ContentLength = contentLength,
MaskingKey = maskingKey,
Content = content
});
}
