public void HandleRequest(string uri, HttpRequest request, HttpResponse response, HttpContext context)
{
if (request.Method != HttpMethod.Get)
throw new HttpMethodNotAllowedException();
// Replace '/' with '.' to generate the resource name
string resourceName = uri.Replace('/', '.');
if (resourceName.StartsWith("."))
resourceName = m_prefix + resourceName;
else
resourceName = string.Format("{0}.{1}", m_prefix, resourceName);
Stream resource = null;
// If we are not expecting a directory, try and load the stream
if (!resourceName.EndsWith("."))
resource = m_assembly.GetManifestResourceStream(resourceName);
else
resourceName = resourceName.Substring(0, resourceName.Length - 1);
// If nothing found try and load the default filename instead
if ((resource == null) && (m_defaultFile != null))
{
// Try the default file
resourceName = string.Format("{0}.{1}", resourceName, m_defaultFile);
resource = m_assembly.GetManifestResourceStream(resourceName);
}
if (resource == null)
throw new HttpNotFoundException();
// Get the mime type and send the file
response.Headers[HttpHeaders.ContentType] = MimeType.FromExtension(resourceName);
resource.CopyTo(response.Content);
}
/// <summary>
/// Handle the request
/// </summary>
/// <param name="uri"></param>
/// <param name="request"></param>
/// <param name="response"></param>
/// <param name="context"></param>
public void HandleRequest(string uri, HttpRequest request, HttpResponse response, HttpContext context)
{
// Split into path and filename
int index = uri.LastIndexOf('/');
string path = (index < 0) ? "" : uri.Substring(0, index);
string filename = (index < 0) ? uri : uri.Substring(index + 1);
// Use default filename if applicable
if (filename.Length == 0)
filename = m_defaultFile;
// Strip leading separators from URI
if (path.StartsWith("/"))
path = path.Substring(1);
// Now look for the file
IFolder folder = m_basePath.OpenChild(path);
if (folder == null)
throw new HttpNotFoundException();
if (!folder.FileExists(filename))
throw new HttpNotFoundException();
// Get the content type
response.ResponseCode = HttpResponseCode.Ok;
response.ContentType = MimeType.FromExtension(filename);
using(Stream input = folder.CreateFile(filename, FileAccessMode.Read, CreationOptions.OpenIfExists))
input.CopyTo(response.Content);
}
/// <summary>
/// Handle the HTTP connection
///
/// This implementation doesn't support keep alive so each HTTP session
/// consists of parsing the request, dispatching to a handler and then
/// sending the response before closing the connection.
/// </summary>
/// <param name="server"></param>
/// <param name="input"></param>
/// <param name="output"></param>
public void ProcessHttpRequest(Stream input, Stream output)
{
// Set up state
HttpRequest request = null;
HttpResponse response = null;
HttpException parseError = null;
// Process the request
try
{
request = ParseRequest(input);
if ((request == null) || !m_connected)
return; // Nothing we can do, just drop the connection
// Do we have any content in the body ?
if (request.Headers.ContainsKey(HttpHeaders.ContentType))
{
if (!request.Headers.ContainsKey(HttpHeaders.ContentLength))
throw new HttpLengthRequiredException();
int length;
if (!int.TryParse(request.Headers[HttpHeaders.ContentLength], out length))
throw new HttpLengthRequiredException();
request.ContentLength = length;
if (length > MaxRequestBody)
throw new HttpRequestEntityTooLargeException();
// Read the data in
MemoryStream content = new MemoryStream();
while (m_connected && (content.Length != length))
{
ReadData(input);
content.Write(m_buffer, 0, m_index);
ExtractBytes(m_index);
}
// Did the connection drop while reading?
if (!m_connected)
return;
// Reset the stream location and attach it to the request
content.Seek(0, SeekOrigin.Begin);
request.Content = content;
}
// Process the cookies
if (request.Headers.ContainsKey(HttpHeaders.Cookie))
{
string[] cookies = request.Headers[HttpHeaders.Cookie].Split(CookieSeparator);
foreach (string cookie in cookies)
{
string[] parts = cookie.Split(CookieValueSeparator);
Cookie c = new Cookie();
c.Name = parts[0].Trim();
if (parts.Length > 1)
c.Value = parts[1].Trim();
request.Cookies.Add(c);
}
}
// We have at least a partial request, create the matching response
HttpContext context = new HttpContext();
response = new HttpResponse();
// Apply filters
m_server.ApplyFilters(request, response, context);
// TODO: Check for WebSocket upgrade
IWebSocketRequestHandler wsHandler = UpgradeToWebsocket(request, response);
if (wsHandler!=null)
{
// Write the response back to accept the connection
response.Send(output);
output.Flush();
// Now we can process the websocket
WebSocket ws = new WebSocket(input, output);
wsHandler.Connected(ws);
ws.Run();
// Once the websocket connection is finished we don't need to do anything else
return;
}
// Dispatch to the handler
string partialUri;
IHttpRequestHandler handler = m_server.GetHandlerForUri(request.URI, out partialUri);
if (handler == null)
throw new HttpNotFoundException();
handler.HandleRequest(partialUri, request, response, context);
}
catch (HttpException ex)
{
parseError = ex;
}
catch (Exception)
{
parseError = new HttpInternalServerErrorException();
}
// Do we need to send back an error response ?
if (parseError != null)
{
// TODO: Clear any content that might already be added
response.ResponseCode = parseError.ResponseCode;
response.ResponseMessage = parseError.Message;
}
// Write the response
response.Send(output);
output.Flush();
}
/// <summary>
/// Check for an upgrade to a web socket connection.
/// </summary>
/// <param name="request"></param>
/// <param name="response"></param>
/// <returns></returns>
private IWebSocketRequestHandler UpgradeToWebsocket(HttpRequest request, HttpResponse response)
{
// Check for required headers
if (!(request.Headers.ContainsKey(HttpHeaders.Connection) && request.Headers[HttpHeaders.Connection].Contains("Upgrade")))
return null;
if (!(request.Headers.ContainsKey(HttpHeaders.Upgrade) && request.Headers[HttpHeaders.Upgrade].Contains("websocket")))
return null;
if (!request.Headers.ContainsKey(SecWebSocketVersion))
return null;
int version;
if (!(int.TryParse(request.Headers[SecWebSocketVersion], out version) && (version == 13)))
return null;
if (!request.Headers.ContainsKey(SecWebSocketKey))
return null;
// Make sure we have a handler for the URI
string partial;
IWebSocketRequestHandler handler = m_server.GetHandlerForWebSocket(request.URI, out partial);
if (handler == null)
return null;
// Do we support the protocols requested?
string protocol = null;
if (request.Headers.ContainsKey(SecWebSocketProtocol))
{
foreach (string proto in request.Headers[SecWebSocketProtocol].Split(WebSocketProtocolSeparator))
{
if (handler.WillAcceptRequest(partial, proto.Trim()))
{
protocol = proto.Trim();
break;
}
}
}
else if (handler.WillAcceptRequest(partial, ""))
protocol = "";
if (protocol == null)
return null;
// Finish the handshake
byte[] security = Encoding.UTF8.GetBytes(request.Headers[SecWebSocketKey].Trim() + "258EAFA5-E914-47DA-95CA-C5AB0DC85B11");
SHA1CryptoServiceProvider sha1 = new SHA1CryptoServiceProvider();
sha1.Initialize();
sha1.HashCore(security, 0, security.Length);
security = sha1.HashFinal();
response.Headers[SecWebSocketAccept] = Convert.ToBase64String(security);
response.Headers[HttpHeaders.Upgrade] = "websocket";
response.Headers[HttpHeaders.Connection] = "Upgrade";
response.ResponseCode = HttpResponseCode.SwitchingProtocols;
if (protocol.Length > 0)
response.Headers[SecWebSocketProtocol] = protocol;
// And we are done
return handler;
}
/// <summary>
/// Apply all the filters to the current request
/// </summary>
/// <param name="request"></param>
/// <param name="response"></param>
/// <param name="context"></param>
internal void ApplyFilters(HttpRequest request, HttpResponse response, HttpContext context)
{
lock (m_filters)
{
foreach (IHttpFilter filter in m_filters)
filter.ApplyFilter(request, response, context);
}
}
/// <summary>
/// Apply all the filters to the current request
/// </summary>
/// <param name="request"></param>
/// <param name="response"></param>
/// <param name="context"></param>
internal void ApplyAfterFilters(HttpRequest request, HttpResponse response, HttpContext context)
{
lock (m_filters)
{
foreach (IHttpFilter filter in m_filters)
{
try
{
filter.After(request, response, context);
}
catch (Exception)
{
// Just silently ignore it
}
}
}
}
/// <summary>
/// Apply all the filters to the current request
/// </summary>
/// <param name="request"></param>
/// <param name="response"></param>
/// <param name="context"></param>
internal bool ApplyBeforeFilters(HttpRequest request, HttpResponse response, HttpContext context)
{
bool allowHandling = true;
lock (m_filters)
{
foreach (IHttpFilter filter in m_filters)
{
try
{
allowHandling = allowHandling && filter.Before(request, response, context);
}
catch (Exception)
{
// Just silently ignore it
}
}
}
return allowHandling;
}
