NormalOperationWindow.hpp

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00032 
00033 #ifndef NORMALOPERATIONWINDOW_HPP
00034 #define NORMALOPERATIONWINDOW_HPP
00035 
00036 #include <memory>
00037 #include <vector>
00038 #include <MaximInterfaceCore/array.hpp>
00039 #include <mbed-os/features/netsocket/TCPSocket.h>
00040 #include <rapidjson/document.h >
00041 #include "Button.hpp"
00042 #include "SensorNode.hpp"
00043 #include "Window.hpp"
00044 
00045 /// @brief
00046 /// Handles normal operation of the demo including displaying status information
00047 /// and processing commands from the server.
00048 class NormalOperationWindow : public Window {
00049 public:
00050   /// @param socket
00051   /// Socket that has been initialized by connecting to the web server. This
00052   /// must be a heap allocated object that NormalOperationWindow will take
00053   /// ownership of.
00054   explicit NormalOperationWindow (std::auto_ptr<TCPSocket> & socket);
00055 
00056 protected:
00057   virtual void resized();
00058   virtual void updated();
00059   virtual void doRender(Bitmap & bitmap, int xOffset, int yOffset) const;
00060   virtual bool doProcessKey(Key key);
00061 
00062 private:
00063   enum Result {
00064     NoChange,      // Windows not changed; No redraw required.
00065     WindowsChanged // Windows have changed; Redraw is required.
00066   };
00067 
00068   std::auto_ptr<TCPSocket> socket;
00069 
00070   // Socket receive buffer. Must be large enough to hold the largest command.
00071   char recvBuf[1280];
00072 
00073   // Challenge sent to the server with a command response to sign the next
00074   // command against.
00075   MaximInterfaceCore::array<uint8_t, 32> commandChallenge;
00076   bool sendChallenge;
00077 
00078   // Device status information.
00079   bool validSignature;
00080   SensorNode::State  lastSensorNodeState;
00081   double lastObjectTemp;
00082   double lastAmbientTemp;
00083 
00084   Button validSignatureButton;
00085   Button showWebIdButton;
00086 
00087   // Button event handlers.
00088   void showWebId(Button *);
00089   void toggleValidSignature(Button *);
00090 
00091   // Creates a new command challenge, and adds it to an existing JSON document.
00092   MaximInterfaceCore::Result<void>
00093   addCommandChallenge(rapidjson::Document & document);
00094 
00095   // Adds signature information to an existing JSON document.
00096   static MaximInterfaceCore::Result<void>
00097   signData(rapidjson::Document & document, bool validSignature,
00098            const std::vector<uint8_t> & challenge);
00099 
00100   // Finalizes a command response to the server by adding the next command
00101   // challenge and signing the data.
00102   MaximInterfaceCore::Result<void>
00103   finalizeResponse(rapidjson::Document & document, bool validSignature,
00104                    const std::vector<uint8_t> & responseChallenge);
00105 
00106   // Parse and verify a signed JSON string.
00107   MaximInterfaceCore::Result<void>
00108   verifySignedData(rapidjson::Document & signedData,
00109                    MaximInterfaceCore::span<const char> verifyDataIn);
00110 
00111   // Send a JSON document to the server.
00112   void sendJson(const rapidjson::Value & document);
00113 
00114   // Send a message to the server message log.
00115   void sendMessage(const char * message);
00116 
00117   Result processReceivedData(size_t recvBufSize);
00118   Result sendStatus(const std::vector<uint8_t> & responseChallenge);
00119   Result sendObjectTemp(const std::vector<uint8_t> & responseChallenge);
00120   Result sendAmbientTemp(const std::vector<uint8_t> & responseChallenge);
00121   void displayImage(const std::vector<uint8_t> & imageData);
00122 };
00123 
00124 #endif