public static async Task <HttpRequest> GetIncomingRequest(Stream inputStream,
List <byte> cache,
Delegate_verifyHeaders proc_verify,
CancellationToken token)
{
// Read Request Line
string request = await ReadLineAsync(inputStream, cache, token);
if (string.IsNullOrEmpty(request))
{
return(null); // 表示前端已经切断通讯
}
#if NO
string[] tokens = request.Split(' ');
if (tokens.Length != 3)
{
throw new Exception("invalid http request line");
}
#endif
List <string> tokens = MessageUtility.SplitFirstLine(request);
if (tokens == null)
{
throw new Exception("1 invalid http request line '" + request + "'");
}
string method = tokens[0].ToUpper();
string url = tokens[1];
string protocolVersion = tokens[2];
//Read Headers
Dictionary <string, string> headers = new Dictionary <string, string>();
string line;
while ((line = await ReadLineAsync(inputStream, cache, token)) != null)
{
if (line.Equals(""))
{
break;
}
int separator = line.IndexOf(':');
if (separator == -1)
{
throw new Exception("1 invalid http header line: " + line);
}
string name = line.Substring(0, separator);
int pos = separator + 1;
while ((pos < line.Length) && (line[pos] == ' '))
{
pos++;
}
string value = line.Substring(pos, line.Length - pos);
headers.Add(name, value);
if (headers.Count > MAX_HEADER_LINES)
{
throw new Exception("headers 行数超过配额");
}
}
if (proc_verify != null)
{
if (proc_verify(headers) == false)
{
return(null);
}
}
byte[] raw_content = null;
if (headers.ContainsKey("Content-Length"))
{
int totalBytes = Convert.ToInt32(headers["Content-Length"]);
if (totalBytes >= MAX_ENTITY_BYTES)
{
throw new Exception("Content-Length " + totalBytes + " 超过配额");
}
int bytesLeft = totalBytes;
byte[] bytes = new byte[totalBytes];
while (bytesLeft > 0)
{
byte[] buffer = new byte[bytesLeft > 1024 ? 1024 : bytesLeft];
int nRet = 0;
if (cache.Count > 0)
{
nRet = Math.Min(buffer.Length, cache.Count);
Array.Copy(cache.ToArray(), buffer, nRet);
cache.RemoveRange(0, nRet);
}
int n = 0;
if (nRet < buffer.Length)
{
// int n = inputStream.Read(buffer, 0, buffer.Length);
n = await inputStream.ReadAsync(buffer, nRet, buffer.Length - nRet, token);
}
buffer.CopyTo(bytes, totalBytes - bytesLeft);
bytesLeft -= nRet + n;
}
raw_content = bytes;
}
return(new HttpRequest()
{
Method = method,
Url = url,
Version = protocolVersion,
Headers = headers,
Content = raw_content
});
}
// 从 dp2library 获得响应
private static async Task <HttpResponse> GetResponseAsync(Stream inputStream,
CancellationToken token)
{
// Read Response Line
string first_line = await ReadLineAsync0(inputStream, token);
#if NO
// HTTP/1.1 404 Not Found
string[] tokens = request.Split(' ');
if (tokens.Length != 3)
{
throw new Exception("1 invalid http response line '" + request + "'");
}
#endif
List <string> tokens = MessageUtility.SplitFirstLine(first_line);
if (tokens == null)
{
throw new Exception("1 invalid http response line '" + first_line + "'");
}
string version = tokens[0].ToUpper();
string status_code = tokens[1];
string reason_phrase = tokens[2];
//Read Headers
Dictionary <string, string> headers = new Dictionary <string, string>();
string line;
while ((line = await ReadLineAsync0(inputStream, token)) != null)
{
if (line.Equals(""))
{
break;
}
int separator = line.IndexOf(':');
if (separator == -1)
{
throw new Exception("2 invalid http header line: " + line);
}
string name = line.Substring(0, separator);
int pos = separator + 1;
while ((pos < line.Length) && (line[pos] == ' '))
{
pos++;
}
string value = line.Substring(pos, line.Length - pos);
headers.Add(name, value);
}
byte[] raw_content = null;
if (headers.ContainsKey("Content-Length"))
{
int totalBytes = Convert.ToInt32(headers["Content-Length"]);
// TODO 观察配额
int bytesLeft = totalBytes;
byte[] bytes = new byte[totalBytes];
while (bytesLeft > 0)
{
byte[] buffer = new byte[bytesLeft > 1024 ? 1024 : bytesLeft];
int n = await inputStream.ReadAsync(buffer, 0, buffer.Length, token);
buffer.CopyTo(bytes, totalBytes - bytesLeft);
bytesLeft -= n;
}
raw_content = bytes;
}
return(new HttpResponse()
{
StatusCode = status_code,
ReasonPhrase = reason_phrase,
Headers = headers,
Content = raw_content
});
}