Using InsomniaServer to Build a Web-interface for your Application

using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Drawing;
using System.Drawing.Imaging;
using System.Windows.Forms;
using System.Net;

using InsomniaSoftware.Server;
using InsomniaSoftware.Server.Sources;


namespace MultiPaint
{
    class Sources
    {
        static MainForm _mainForm;
        static InsomniaServer _server;


        /// <summary>
        /// Adds all needed sources to the server
        /// </summary>
        public static void AddSources(MainForm mainForm, InsomniaServer server)
        {
            _mainForm = mainForm;
            _server = server;

            server.fileSystem.AddSource("index.html", GetPaintSource, null);
            server.fileSystem.AddSource("setcolor.html", GetSetColorSource, null);

            //Image download sources
            server.fileSystem.AddSource("image.bmp", GetDownloadPictureSource, ImageFormat.Bmp);
            server.fileSystem.AddSource("image.jpg", GetDownloadPictureSource, ImageFormat.Jpeg);
            server.fileSystem.AddSource("image.png", GetDownloadPictureSource, ImageFormat.Png);
        }

        
        public static ObjectType GetPaintSource(string subPath, HttpRequest request, object userData, out Source source)
        {
            StreamReader reader = new StreamReader("../paint.html", Encoding.ASCII);
            string pageContent = reader.ReadToEnd();
            reader.Dispose();

            Session newSession = request.server.sessionManager.RegisterSession();

            //Create a new PainForm and fill needed values into the registered session
            PaintForm newPaintForm = (PaintForm)_mainForm.Invoke(new CreatePaintFormDelegate(CreatePaintForm), request.remoteEndPoint.ToString() + " - " + newSession.id);
            newSession.SetValue("form", newPaintForm);
            newSession.SetValue("ip", request.remoteEndPoint.Address);
            newSession.OnDispose += new DisposeSessionDelegate(DisposeSession);

            //Update client list
            _mainForm.UpdateContent();

            //Prepare page and send
            pageContent = pageContent.Replace("<!--#SID#-->", newSession.id);
            source = new BinarySource(Encoding.ASCII.GetBytes(pageContent), ContentType.FromType(ContentType.Type.Html));
            return ObjectType.File;
        }


        public static ObjectType GetSetColorSource(string subPath, HttpRequest request, object userData, out Source source)
        {
            source = null;

            StringParameter sessionId = request.GetParameterAsString("sid");
            if (sessionId == null)
                return ObjectType.NotFound;

            Session belongingSession = _server.sessionManager.GetSession(sessionId.value);
            if (belongingSession == null)
                return ObjectType.NotFound;

            if (!((IPAddress)belongingSession.GetValue("ip")).Equals(request.remoteEndPoint.Address))
                return ObjectType.NotFound;

            IntParameter x = request.GetParameterAsInt("x");
            IntParameter y = request.GetParameterAsInt("y");
            StringParameter color = request.GetParameterAsString("c");

            IntParameter width = request.GetParameterAsInt("w");
            IntParameter height = request.GetParameterAsInt("h");

            if (sessionId == null || x == null || y == null || color == null)
                return ObjectType.NotFound;

            PaintForm paintForm = (PaintForm)belongingSession.GetValue("form");
            if (paintForm == null)
                return ObjectType.NotFound;

            if (width != null || height != null)
                paintForm.SetSize(width != null ? width.value : -1, height != null ? height.value : -1);

            try
            {
                Color finalColor = Color.FromArgb(int.Parse(color.value.Substring(1, 2), System.Globalization.NumberStyles.AllowHexSpecifier),
                                                  int.Parse(color.value.Substring(3, 2), System.Globalization.NumberStyles.AllowHexSpecifier),
                                                  int.Parse(color.value.Substring(5, 2), System.Globalization.NumberStyles.AllowHexSpecifier));
                while (paintForm.SetPixel(x.value, y.value, finalColor) == false) { } //While to prevent possible errors (not drawn pixels)
            }
            catch
            {
                return ObjectType.NotFound;
            }

            source = new NoContentSource();
            return ObjectType.File;
        }


        public static ObjectType GetDownloadPictureSource(string subPath, HttpRequest request, object userData, out Source source)
        {
            source = null;

            StringParameter sessionId = request.GetParameterAsString("sid");
            if (sessionId == null)
                return ObjectType.NotFound;

            Session belongingSession = _server.sessionManager.GetSession(sessionId.value);
            if (belongingSession == null)
                return ObjectType.NotFound;

            PaintForm paintForm = (PaintForm)belongingSession.GetValue("form");
            if (paintForm == null)
                return ObjectType.NotFound;

            source = new StreamSource(paintForm.SaveImage((ImageFormat)userData), ContentType.FromType(ContentType.Type.Binary), true);
            return ObjectType.File;
        }


        delegate PaintForm CreatePaintFormDelegate(string title);
        static PaintForm CreatePaintForm(string title)
        {
            PaintForm newPaintForm = new PaintForm();
            newPaintForm.Text = title;
            newPaintForm.Show(_mainForm);
            return newPaintForm;
        }

        static void DisposeSession(Session sessionToBeDisposed)
        {
            //Dispose the form, when session is removed - else the form will survive in background

            PaintForm paintForm = (PaintForm)sessionToBeDisposed.GetValue("form");
            if (paintForm != null)
                paintForm.Invoke(new DisposeDelegate(DisposeSessionAction), paintForm);
            _mainForm.UpdateContent();
        }

        delegate void DisposeDelegate(PaintForm paintForm);
        static void DisposeSessionAction(PaintForm paintForm)
        {
            paintForm.Dispose();
        }
    }
}