using System;
using System.IO;
using System.Web;

/*
 * Copyright (C) 2008-2010 by EDR.
 * Written by EDR info@kendar.org
 * All Rights Reserved
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

/*
 * To let this thing works you should add the following httpHandler to your 
 * Web.config, this way all static files will be intercepted by this "trasnparent"
 * http handler that will throw exceptions if file are not found
      <configuration>
            <system.web>
                  <httpHandlers>
                        <add verb="*" path="*.gif" type="com.kendar.utils.DebugHttpHandler"/>
                        <add verb="*" path="*.jpg" type="com.kendar.utils.DebugHttpHandler"/>
                        <add verb="*" path="*.jpeg" type="com.kendar.utils.DebugHttpHandler"/>
                        <add verb="*" path="*.css" type="com.kendar.utils.DebugHttpHandler"/>
                        <add verb="*" path="*.htm" type="com.kendar.utils.DebugHttpHandler"/>
                        <add verb="*" path="*.html" type="com.kendar.utils.DebugHttpHandler"/>
                        <add verb="*" path="*.shtml" type="com.kendar.utils.DebugHttpHandler"/>
                        <add verb="*" path="*.png" type="com.kendar.utils.DebugHttpHandler"/>
                        <add verb="*" path="*.txt" type="com.kendar.utils.DebugHttpHandler"/>
                        <add verb="*" path="*.xml" type="com.kendar.utils.DebugHttpHandler"/>
                  </httpHandlers>
            </system.web>
      </configuration>
 */

namespace com.kendar.utils
{
    /// <summary>
    /// For debuggin purpose to find forgotten files, is a kind of wrapper to avoid seeking desperately for
    /// unknown files
    /// Should add some section to Web.config to intercept the various static files
    /// configuration, for exeample to check allthe gif files:
    /// -system.web
    /// --httpHandlers
    /// ---add verb="*" path="*.gif" type="com.kendar.utils.DebugHttpHandler"      
    /// </summary>
    public class DebugHttpHandler : IHttpHandler //StaticFileHandler
    {
        /// <summary>
        /// Process the request 
        /// </summary>
        /// <param name="context"></param>
        public void ProcessRequest(HttpContext context)
        {
            string objPath = HttpContext.Current.Request.MapPath(context.Request.FilePath);
            string mimeType = DebugHttpHandler.DetectMime(objPath);

            context.Response.ContentType = mimeType;
            if (File.Exists(objPath))
            {
                FileStream fs = File.OpenRead(objPath);
                DebugHttpHandler.CopyStreamToStream(fs, context.Response.OutputStream);
            }
            else
            {
                throw new FileNotFoundException(context.Request.FilePath);
            }
        }



        /// <summary>
        /// Is reusable always because is only a simple static file manager
        /// </summary>
        public bool IsReusable
        {
            get
            {
                return true;
            }
        }

        /// <summary>
        /// Write from stream to another stream
        /// </summary>
        /// <param name="sourceStream"></param>
        /// <param name="targetStream"></param>
        private static void CopyStreamToStream(FileStream sourceStream, Stream targetStream)
        {
            // What's the size of the source stream:
            int size = (int)sourceStream.Length;
            // Create a buffer that same size:
            byte[] buffer = new byte[size];
            // Move the source stream to the beginning:
            sourceStream.Seek(0, SeekOrigin.Begin);
            // copy the whole sourceStream into our buffer:
            sourceStream.Read(buffer, 0, size);
            // Write out buffer to the target stream:
            targetStream.Write(buffer, 0, size);
        }

        /// <summary>
        /// Detect some standard mime types
        /// </summary>
        /// <param name="objPath"></param>
        /// <returns></returns>
        private static string DetectMime(string objPath)
        {
            int typ = objPath.LastIndexOf('.');
            string ext = "";
            if (typ >= 0)
            {
                ext = objPath.Substring(typ);
            }
            switch (ext)
            {
                case ("323"): return "text/h323";
                case ("asx"): return "video/x-ms-asf";
                case ("acx"): return "application/internet-property-stream";
                case ("ai"): return "application/postscript";
                case ("aif"): return "audio/x-aiff";
                case ("aiff"): return "audio/aiff";
                case ("axs"): return "application/olescript";
                case ("aifc"): return "audio/aiff";
                case ("asr"): return "video/x-ms-asf";
                case ("avi"): return "video/x-msvideo";
                case ("asf"): return "video/x-ms-asf";
                case ("au"): return "audio/basic";
                case ("application"): return "application/x-ms-application";
                case ("bin"): return "application/octet-stream";
                case ("bas"): return "text/plain";
                case ("bcpio"): return "application/x-bcpio";
                case ("bmp"): return "image/bmp";
                case ("cdf"): return "application/x-cdf";
                case ("cat"): return "application/vndms-pkiseccat";
                case ("crt"): return "application/x-x509-ca-cert";
                case ("c"): return "text/plain";
                case ("css"): return "text/css";
                case ("cer"): return "application/x-x509-ca-cert";
                case ("crl"): return "application/pkix-crl";
                case ("cmx"): return "image/x-cmx";
                case ("csh"): return "application/x-csh";
                case ("cod"): return "image/cis-cod";
                case ("cpio"): return "application/x-cpio";
                case ("clp"): return "application/x-msclip";
                case ("crd"): return "application/x-mscardfile";
                case ("deploy"): return "application/octet-stream";
                case ("dll"): return "application/x-msdownload";
                case ("dot"): return "application/msword";
                case ("doc"): return "application/msword";
                case ("dvi"): return "application/x-dvi";
                case ("dir"): return "application/x-director";
                case ("dxr"): return "application/x-director";
                case ("der"): return "application/x-x509-ca-cert";
                case ("dib"): return "image/bmp";
                case ("dcr"): return "application/x-director";
                case ("disco"): return "text/xml";
                case ("exe"): return "application/octet-stream";
                case ("etx"): return "text/x-setext";
                case ("evy"): return "application/envoy";
                case ("eml"): return "message/rfc822";
                case ("eps"): return "application/postscript";
                case ("flr"): return "x-world/x-vrml";
                case ("fif"): return "application/fractals";
                case ("gtar"): return "application/x-gtar";
                case ("gif"): return "image/gif";
                case ("gz"): return "application/x-gzip";
                case ("hta"): return "application/hta";
                case ("htc"): return "text/x-component";
                case ("htt"): return "text/webviewhtml";
                case ("h"): return "text/plain";
                case ("hdf"): return "application/x-hdf";
                case ("hlp"): return "application/winhlp";
                case ("html"): return "text/html";
                case ("shtml"): return "text/html";
                case ("htm"): return "text/html";
                case ("stm"): return "text/html";
                case ("hqx"): return "application/mac-binhex40";
                case ("isp"): return "application/x-internet-signup";
                case ("iii"): return "application/x-iphone";
                case ("ief"): return "image/ief";
                case ("ivf"): return "video/x-ivf";
                case ("ins"): return "application/x-internet-signup";
                case ("ico"): return "image/x-icon";
                case ("jpg"): return "image/jpeg";
                case ("jfif"): return "image/pjpeg";
                case ("jpe"): return "image/jpeg";
                case ("jpeg"): return "image/jpeg";
                case ("png"): return "image/png";
                case ("js"): return "application/x-javascript";
                case ("lsx"): return "video/x-la-asf";
                case ("latex"): return "application/x-latex";
                case ("lsf"): return "video/x-la-asf";
                case ("manifest"): return "application/x-ms-manifest";
                case ("mhtml"): return "message/rfc822";
                case ("mny"): return "application/x-msmoney";
                case ("mht"): return "message/rfc822";
                case ("mid"): return "audio/mid";
                case ("mpv2"): return "video/mpeg";
                case ("man"): return "application/x-troff-man";
                case ("mvb"): return "application/x-msmediaview";
                case ("mpeg"): return "video/mpeg";
                case ("m3u"): return "audio/x-mpegurl";
                case ("mdb"): return "application/x-msaccess";
                case ("mpp"): return "application/vndcase.ms-project";
                case ("m1v"): return "video/mpeg";
                case ("mpa"): return "video/mpeg";
                case ("me"): return "application/x-troff-me";
                case ("m13"): return "application/x-msmediaview";
                case ("movie"): return "video/x-sgi-movie";
                case ("m14"): return "application/x-msmediaview";
                case ("mpe"): return "video/mpeg";
                case ("mp2"): return "video/mpeg";
                case ("mov"): return "video/quicktime";
                case ("mp3"): return "audio/mpeg";
                case ("mpg"): return "video/mpeg";
                case ("ms"): return "application/x-troff-ms";
                case ("nc"): return "application/x-netcdf";
                case ("nws"): return "message/rfc822";
                case ("oda"): return "application/oda";
                case ("ods"): return "application/oleobject";
                case ("pmc"): return "application/x-perfmon";
                case ("p7r"): return "application/x-pkcs7-certreqresp";
                case ("p7b"): return "application/x-pkcs7-certificates";
                case ("p7s"): return "application/pkcs7-signature";
                case ("pmw"): return "application/x-perfmon";
                case ("ps"): return "application/postscript";
                case ("p7c"): return "application/pkcs7-mime";
                case ("pbm"): return "image/x-portable-bitmap";
                case ("ppm"): return "image/x-portable-pixmap";
                case ("pub"): return "application/x-mspublisher";
                case ("pnm"): return "image/x-portable-anymap";
                case ("pml"): return "application/x-perfmon";
                case ("p10"): return "application/pkcs10";
                case ("pfx"): return "application/x-pkcs12";
                case ("p12"): return "application/x-pkcs12";
                case ("pdf"): return "application/pdf";
                case ("pps"): return "application/vndcase.ms-powerpoint";
                case ("p7m"): return "application/pkcs7-mime";
                case ("pko"): return "application/vndms-pkipko";
                case ("ppt"): return "application/vndcase.ms-powerpoint";
                case ("pmr"): return "application/x-perfmon";
                case ("pma"): return "application/x-perfmon";
                case ("pot"): return "application/vndcase.ms-powerpoint";
                case ("prf"): return "application/pics-rules";
                case ("pgm"): return "image/x-portable-graymap";
                case ("qt"): return "video/quicktime";
                case ("ra"): return "audio/x-pn-realaudio";
                case ("rgb"): return "image/x-rgb";
                case ("ram"): return "audio/x-pn-realaudio";
                case ("rmi"): return "audio/mid";
                case ("ras"): return "image/x-cmu-raster";
                case ("roff"): return "application/x-troff";
                case ("rtf"): return "application/rtf";
                case ("rtx"): return "text/richtext";
                case ("sv4crc"): return "application/x-sv4crc";
                case ("spc"): return "application/x-pkcs7-certificates";
                case ("setreg"): return "application/set-registration-initiation";
                case ("snd"): return "audio/basic";
                case ("stl"): return "application/vndms-pkistl";
                case ("setpay"): return "application/set-payment-initiation";
                case ("shar"): return "application/x-shar";
                case ("sh"): return "application/x-sh";
                case ("sit"): return "application/x-stuffit";
                case ("spl"): return "application/futuresplash";
                case ("sct"): return "text/scriptlet";
                case ("scd"): return "application/x-msschedule";
                case ("sst"): return "application/vndms-pkicertstore";
                case ("src"): return "application/x-wais-source";
                case ("sv4cpio"): return "application/x-sv4cpio";
                case ("tex"): return "application/x-tex";
                case ("tgz"): return "application/x-compressed";
                case ("t"): return "application/x-troff";
                case ("tar"): return "application/x-tar";
                case ("tr"): return "application/x-troff";
                case ("tif"): return "image/tiff";
                case ("txt"): return "text/plain";
                case ("texinfo"): return "application/x-texinfo";
                case ("trm"): return "application/x-msterminal";
                case ("tiff"): return "image/tiff";
                case ("tcl"): return "application/x-tcl";
                case ("texi"): return "application/x-texinfo";
                case ("tsv"): return "text/tab-separated-values";
                case ("ustar"): return "application/x-ustar";
                case ("uls"): return "text/iuls";
                case ("vcf"): return "text/x-vcard";
                case ("wps"): return "application/vndcase.ms-works";
                case ("wav"): return "audio/wav";
                case ("wrz"): return "x-world/x-vrml";
                case ("wri"): return "application/x-mswrite";
                case ("wks"): return "application/vndcase.ms-works";
                case ("wmf"): return "application/x-msmetafile";
                case ("wcm"): return "application/vndcase.ms-works";
                case ("wrl"): return "x-world/x-vrml";
                case ("wdb"): return "application/vndcase.ms-works";
                case ("wsdl"): return "text/xml";
                case ("xml"): return "text/xml";
                case ("xlm"): return "application/vndcase.ms-excel";
                case ("xaf"): return "x-world/x-vrml";
                case ("xla"): return "application/vndcase.ms-excel";
                case ("xls"): return "application/vndcase.ms-excel";
                case ("xof"): return "x-world/x-vrml";
                case ("xlt"): return "application/vndcase.ms-excel";
                case ("xlc"): return "application/vndcase.ms-excel";
                case ("xsl"): return "text/xml";
                case ("xbm"): return "image/x-xbitmap";
                case ("xlw"): return "application/vndcase.ms-excel";
                case ("xpm"): return "image/x-xpixmap";
                case ("xwd"): return "image/x-xwindowdump";
                case ("xsd"): return "text/xml";
                case ("z"): return "application/x-compress";
                case ("zip"): return "application/x-zip-compressed";
                default: return "application/octet-stream";
            }
        }
    }
}