HTTPWebSocketHandler.h

00001 #ifndef HTTP_WEB_SOCKET_HANDLER_H
00002 #define HTTP_WEB_SOCKET_HANDLER_H
00003 
00004 #include "mbed.h"
00005 #include "HTTPServer.h"
00006 #include "TemperatureSensor.h"
00007 #include "RGBLed.h"
00008 
00009 // Abstrct base class for state delegation
00010 class HTTPWebSocketState : public HTTPData {
00011 public:
00012     virtual HTTPStatus init(HTTPConnection *conn) = 0;
00013     virtual HTTPHandle data(HTTPConnection *conn, void *data, int len) = 0;
00014     virtual HTTPHandle send(HTTPConnection *conn, int maxData) = 0;
00015 };
00016 
00017 // State class for connecting the WebSocket, performing security handshake
00018 class HTTPWebSocketConnectingState : public HTTPWebSocketState {
00019 public:
00020     HTTPWebSocketConnectingState();
00021     virtual HTTPStatus init(HTTPConnection *conn);
00022     virtual HTTPHandle data(HTTPConnection *conn, void *data, int len);
00023     virtual HTTPHandle send(HTTPConnection *conn, int maxData);
00024 private:
00025     // Helper functions
00026     uint32_t extractNumber(const char *keyValue);
00027     uint32_t countSpaces(const char *keyValue);
00028     uint32_t computeKeyPart(const char *keyValue);
00029     void hexStringToBinary(const char *hex, char *binary);
00030     
00031     uint8_t challange[16];
00032 };
00033 
00034 // State class for streaming the WebSocket
00035 class HTTPWebSocketStreamingState : public HTTPWebSocketState {
00036 public:
00037     HTTPWebSocketStreamingState();
00038     virtual HTTPStatus init(HTTPConnection *conn);
00039     virtual HTTPHandle data(HTTPConnection *conn, void *data, int len);
00040     virtual HTTPHandle send(HTTPConnection *conn, int maxData);
00041 private:
00042     DigitalOut led;
00043     int sendCnt;
00044 };
00045 
00046 // HTTP handler for resorces that become WebSockets
00047 class HTTPWebSocketHandler : public HTTPHandler {
00048 public:
00049     HTTPWebSocketHandler(const char *path) : HTTPHandler(path) {
00050         printf("HTTPWebSocketHandler: %s\n", path);
00051     }
00052     
00053 protected:
00054     virtual void reg(HTTPServer *);
00055     virtual HTTPStatus init(HTTPConnection *conn) const;
00056     virtual HTTPHandle data(HTTPConnection *conn, void *data, int len) const; 
00057     virtual HTTPHandle send(HTTPConnection *, int) const;   
00058 };
00059 
00060 #endif