/// <summary>
/// HTTP代理
/// </summary>
/// <param name="context"></param>
/// <returns></returns>
public async Task <Status> HttpProxy(ProxyContext context)
{
if (context.Header == null)
{
return(Status.Exiting);
}
if (context.CurrentHostAddress == null || !Equals(context.Header.Host, context.CurrentHostAddress))
{
return(Status.HostDeciding);
}
if (context.Host == null)
{
await Send404(context);
return(Status.Exiting);
}
//异步转发主机收到的数据到客户端
Forward(context.Host, context.Client, context).GetAwaiter();
var buffer = new byte[context.Configuration.BufferSize];
int bytesRead;
//转发客户端的数据到主机
do
{
context.Header ??= await ProxyHttpHeaders.Parse(context.Client); //刷新请求头
if (context.Header == null)
{
return(Status.Exiting);
}
//主机更换，需要重新连接
if (context.CurrentHostAddress == null || !Equals(context.Header.Host, context.CurrentHostAddress))
{
return(Status.HostDeciding);
}
var header = (context.Redirection == null
? context.Header.HeadersRaw
: context.Header.HeadersRaw.Replace(context.Redirection?.Item1 ?? "!",
context.Redirection?.Item2))
.ToAsciiBytes();
//转发请求头
await context.Host?.WriteBytesAsync
(header, context.Token) !;
//转发请求体 && 其它请求头等等
bytesRead = header.Length;
if (context.Header.ContentLength > 0)
{
var cl = context.Header.ContentLength;
do
{
bytesRead = await context.Client.ReadAsync(buffer, 0,
(int)Math.Min(cl, context.Configuration.BufferSize), context.Token);
await context.Host.WriteAsync(buffer, 0, bytesRead, context.Token);
cl -= bytesRead;
} while (bytesRead > 0 && cl > 0);
}
context.Header = null;
} while (bytesRead > 0);
return(Status.Exiting);
}
/// <summary>
/// 获取请求头部
/// </summary>
/// <param name="context"></param>
/// <returns></returns>
public static async Task <Status> GetHeaders(ProxyContext context)
{
context.Header = await ProxyHttpHeaders.Parse(context.Client);
return(context.Header != null ? Status.HeaderGot : Status.Exiting);
}