/// <summary>
/// 尝试当作http头解析，生成请求对象
/// 如果不是http头则返回false
/// </summary>
/// <param name="context">上下文</param>
/// <param name="request">请求对象</param>
/// <param name="headerLength">请求头长度</param>
/// <param name="contentLength">请求内容长度</param>
/// <returns></returns>
private static bool TryGetRequest(IContenxt context, out HttpRequest request, out int headerLength, out int contentLength)
{
request = null;
headerLength = 0;
contentLength = 0;
var reader = context.StreamReader;
// HTTP Method
reader.Position = 0;
var methodLength = reader.IndexOf(Space);
if (methodLength < 0 || methodLength > MedthodMaxLength)
{
return(false);
}
var methodName = reader.ReadString(Encoding.ASCII, methodLength);
if (MethodNames.Contains(methodName) == false)
{
return(false);
}
var httpMethod = (HttpMethod)Enum.Parse(typeof(HttpMethod), methodName, true);
// HTTP Path
reader.Position += 1;
var pathLength = reader.IndexOf(Space);
if (pathLength < 0)
{
return(false);
}
var path = reader.ReadString(Encoding.ASCII, pathLength);
// HTTP Version
reader.Position += 1;
if (reader.StartWith(HttpVersion11) == false)
{
return(false);
}
reader.Position += HttpVersion11.Length;
if (reader.StartWith(CRLF) == false)
{
return(false);
}
// HTTP Second line
reader.Position += CRLF.Length;
var endIndex = reader.IndexOf(DoubleCRLF);
if (endIndex < 0)
{
return(false);
}
var httpHeader = new HttpHeader();
headerLength = reader.Position + endIndex + DoubleCRLF.Length;
while (reader.Position < headerLength)
{
var keyLength = reader.IndexOf(KvSpliter);
if (keyLength <= 0)
{
break;
}
var key = reader.ReadString(Encoding.ASCII, keyLength);
reader.Position += KvSpliter.Length;
var valueLength = reader.IndexOf(CRLF);
if (valueLength < 0)
{
break;
}
var value = reader.ReadString(Encoding.ASCII, valueLength);
if (reader.StartWith(CRLF) == false)
{
break;
}
reader.Position += CRLF.Length;
httpHeader.Add(key, value);
}
if (httpMethod != HttpMethod.GET)
{
contentLength = httpHeader.TryGet <int>("Content-Length");
if (reader.Length - headerLength < contentLength)
{
return(true);// 数据未完整
}
}
request = new HttpRequest
{
LocalEndPoint = context.Session.LocalEndPoint,
RemoteEndPoint = context.Session.RemoteEndPoint,
HttpMethod = httpMethod,
Headers = httpHeader
};
var scheme = context.Session.IsSecurity ? "https" : "http";
var host = httpHeader["Host"];
if (string.IsNullOrEmpty(host) == true)
{
host = context.Session.LocalEndPoint.ToString();
}
request.Url = new Uri(string.Format("{0}://{1}{2}", scheme, host, path));
request.Path = request.Url.AbsolutePath;
request.Query = HttpNameValueCollection.Parse(request.Url.Query.TrimStart('?'));
return(true);
}
/// <summary>
/// 解析连接请求信息
/// 如果数据未完整则返回null
/// </summary>
/// <param name="buffer">接收到的原始数量</param>
/// <param name="localEndpoint">服务器的本地终结点</param>
/// <param name="remoteEndpoint">远程端的IP和端口</param>
/// <exception cref="HttpException"></exception>
/// <returns></returns>
public static HttpRequest Parse(ReceiveBuffer buffer, IPEndPoint localEndpoint, IPEndPoint remoteEndpoint)
{
buffer.Position = 0;
var doubleCrlf = Encoding.ASCII.GetBytes("\r\n\r\n");
var headerIndex = buffer.IndexOf(doubleCrlf);
if (headerIndex < 0)
{
return(null); // 数据未完整
}
var headerLength = headerIndex + doubleCrlf.Length;
var headerString = buffer.ReadString(headerLength, Encoding.ASCII);
const string pattern = @"^(?<method>[^\s]+)\s(?<path>[^\s]+)\sHTTP\/1\.1\r\n" +
@"((?<field_name>[^:\r\n]+):\s(?<field_value>[^\r\n]*)\r\n)+" +
@"\r\n";
var match = Regex.Match(headerString, pattern, RegexOptions.IgnoreCase);
if (match.Success == false)
{
throw new HttpException(400, "请求中有语法问题，或不能满足请求");
}
var httpMethod = GetHttpMethod(match.Groups["method"].Value);
var httpHeader = new HttpHeader(match.Groups["field_name"].Captures, match.Groups["field_value"].Captures);
var contentLength = httpHeader.TryGet <int>("Content-Length");
if (httpMethod == HttpMethod.POST && buffer.Length - headerLength < contentLength)
{
return(null); // 数据未完整
}
var request = new HttpRequest
{
LocalEndPoint = localEndpoint,
RemoteEndPoint = remoteEndpoint,
HttpMethod = httpMethod,
Headers = httpHeader
};
request.Url = new Uri("http://localhost:" + localEndpoint.Port + match.Groups["path"].Value);
request.Path = request.Url.AbsolutePath;
request.Query = new HttpNameValueCollection(HttpUtility.UrlDecode(request.Url.Query.TrimStart('?')));
if (httpMethod == HttpMethod.GET)
{
request.InputStrem = new byte[0];
request.Form = new HttpNameValueCollection();
request.Files = new HttpFile[0];
}
else
{
request.InputStrem = buffer.ReadArray(contentLength);
buffer.Position = headerLength;
HttpRequest.GeneratePostFormAndFiles(request, buffer);
}
buffer.Clear(headerLength + contentLength);
return(request);
}