prabirshrestha/Readme.txt

## Readme.txt
Example usage:
...in <head>:
<link rel="stylesheet" type="text/css" href="/YuiCompressor.ashx?css=reset,style" />

...just before the </body>:
<script type="text/javascript" src="/YuiCompressor.ashx?js=main,someotherscript"></script>

Changelog:
2010-02-18: Updated to support HTTP compression

## YuiCompressor.ashx
<%@ WebHandler Language="C#" CodeBehind="YuiCompressor.ashx.cs" Class="YuiCompressor" %>

## YuiCompressor.ashx.cs
using System;
using System.Collections.Generic;
using System.Web;
using Yahoo.Yui.Compressor;

public class YuiCompressor : IHttpHandler
{
	public const char DELIMITER = ',';
	public const bool ENABLEHTTPCOMPRESSION = true;
	public TimeSpan CacheDuration = TimeSpan.FromDays(1);

	public class ContentTypes
	{
		public const string CSS = "text/css";
		public const string JS = "application/x-javascript";
		public const string ERROR = "text/plain";
	}

	public class Folders
	{
		// customize these to your site's paths
		public const string CSS = "~/styles/";
		public const string JS = "~/scripts/";
	}

	public class Extensions
	{
		public const string CSS = ".css";
		public const string JS = ".js";
	}

	public void ProcessRequest(HttpContext context)
	{
		context.Response.ContentEncoding = System.Text.Encoding.Default;

		context.Response.Cache.SetExpires(DateTime.Now.Add(CacheDuration));
		context.Response.Cache.SetMaxAge(CacheDuration);
		context.Response.Cache.SetCacheability(HttpCacheability.Private);

		string cssFiles = context.Request.QueryString["css"];
		string jsFiles = context.Request.QueryString["js"];
		string fileName = context.Request.QueryString["f"];

		if (! string.IsNullOrEmpty(cssFiles))
		{
			// A list of CSS files has been passed in, write each file's contents to the response object
			context.Response.ContentType = ContentTypes.CSS;
			foreach (string cssFile in cssFiles.Split(DELIMITER))
			{
				WriteCompressedFile(context, cssFile + Extensions.CSS, Folders.CSS);
			}
		}
		else if (! string.IsNullOrEmpty(jsFiles))
		{
			// A list of JS files has been passed in, write each file's contents to the response object
			context.Response.ContentType = ContentTypes.JS;
			foreach (string jsFile in jsFiles.Split(DELIMITER))
			{
				WriteCompressedFile(context, jsFile + Extensions.JS, Folders.JS);
			}
		}
		else if (! string.IsNullOrEmpty(fileName))
		{
			// A specific file has been passed in, write that file's contents to the response object
			if (fileName.EndsWith(Extensions.JS))
			{
				context.Response.ContentType = ContentTypes.JS;
				WriteCompressedFile(context, fileName, Folders.JS);
			}
			else if (fileName.EndsWith(Extensions.CSS))
			{
				context.Response.ContentType = ContentTypes.CSS;
				WriteCompressedFile(context, fileName, Folders.CSS);
			}
			else
			{
				// 500?
				//Throw New System.IO.FileNotFoundException("The file specified isn't an allowed type.", fileName)
				context.Response.ContentType = ContentTypes.ERROR;
			}
		}
		else
		{
			// 404?
			//Throw New System.IO.FileNotFoundException("A filename hasn't been specified.")
			context.Response.ContentType = ContentTypes.ERROR;
			context.Response.Write(Environment.NewLine);
		}

		// compress output if enabled
		if (ENABLEHTTPCOMPRESSION)
		{
			string encodingsAccepted = context.Request.Headers("Accept-Encoding");
			if (! string.IsNullOrEmpty(encodingsAccepted))
			{
				encodingsAccepted = encodingsAccepted.ToLowerInvariant();
				if (encodingsAccepted.Contains("deflate"))
				{
					context.Response.AppendHeader("Content-Encoding", "deflate");
					context.Response.Filter = New System.IO.Compression.DeflateStream(context.Response.Filter, System.IO.Compression.CompressionMode.Compress);
				}
				else if (encodingsAccepted.Contains("gzip"))
				{
					context.Response.AppendHeader("Content-Encoding", "gzip");
					context.Response.Filter = New System.IO.Compression.GZipStream(context.Response.Filter, System.IO.Compression.CompressionMode.Compress);
				}
			}
		}
	}

	public bool IsReusable
	{
		get
		{
			return false;
		}
	}

	public void WriteCompressedFile(HttpContext context, string fileName, string folder)
	{
		// Add each file's compressed contents to the cache as it is read with a file dependency on itself
		if (context.Cache[fileName] == null)
		{
			string filePath = HttpContext.Current.Server.MapPath(folder + fileName);
			string output = string.Empty;
			try
			{
				output = System.IO.File.ReadAllText(filePath);
				if (folder == Folders.JS)
				{
					output = JavaScriptCompressor.Compress(output) + Environment.NewLine;
				}
				else
				{
					output = CssCompressor.Compress(output) + Environment.NewLine;
				}
				context.Response.Write(output);
				context.Cache.Insert(fileName, output, new System.Web.Caching.CacheDependency(filePath));
			}
			catch (System.IO.FileNotFoundException)
			{
				// throw 404?
			}
		}
		else
		{
			context.Response.Write((string) context.Cache[fileName]);
		}
	}
}

## YuiCompressor.ashx.vb
'<%@ WebHandler Language="VB" Class="YuiCompressor" %>

Imports System
Imports System.Web
Imports Yahoo.Yui.Compressor

Public Class YuiCompressor : Implements IHttpHandler
    Public Const Delimiter As String = ","
    Public Const EnableHttpCompression As Boolean = True
    Public cacheDuration As TimeSpan = TimeSpan.FromDays(1)

    Public Class ContentTypes
        Public Const Css As String = "text/css"
        Public Const Js As String = "application/x-javascript"
        Public Const Err As String = "text/plain"
    End Class

    Public Class Folders
        Public Const Css As String = "~/styles/"
        Public Const Js As String = "~/scripts/"
    End Class

    Public Class Extensions
        Public Const Css As String = ".css"
        Public Const Js As String = ".js"
    End Class

    Public Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest
        context.Response.ContentEncoding = Encoding.Default

        context.Response.Cache.SetExpires(DateTime.Now.Add(cacheDuration))
        context.Response.Cache.SetMaxAge(cacheDuration)
        context.Response.Cache.SetCacheability(HttpCacheability.Private)

        Dim cssFiles As String = context.Request.QueryString("css")
        Dim jsFiles As String = context.Request.QueryString("js")
        Dim fileName As String = context.Request.QueryString("f")

        If Not String.IsNullOrEmpty(cssFiles) Then
            ' A list of CSS files has been passed in, write each file's contents to the response object
            context.Response.ContentType = ContentTypes.Css
            For Each cssFile As String In cssFiles.Split(Delimiter)
                WriteCompressedFile(context, cssFile & Extensions.Css, Folders.Css)
            Next
        ElseIf Not String.IsNullOrEmpty(jsFiles) Then
            ' A list of JS files has been passed in, write each file's contents to the response object
            context.Response.ContentType = ContentTypes.Js
            For Each jsFile As String In jsFiles.Split(Delimiter)
                WriteCompressedFile(context, jsFile & Extensions.Js, Folders.Js)
            Next
        ElseIf Not String.IsNullOrEmpty(fileName) Then
            ' A specific file has been passed in, write that file's contents to the response object
            If fileName.EndsWith(Extensions.Js) Then
                context.Response.ContentType = ContentTypes.Js
                WriteCompressedFile(context, fileName, Folders.Js)
            ElseIf fileName.EndsWith(Extensions.Css) Then
                context.Response.ContentType = ContentTypes.Css
                WriteCompressedFile(context, fileName, Folders.Css)
            Else
                ' 500?
                'Throw New System.IO.FileNotFoundException("The file specified isn't an allowed type.", fileName)
                context.Response.ContentType = ContentTypes.Err
            End If
        Else
            ' 404?
            'Throw New System.IO.FileNotFoundException("A filename hasn't been specified.")
            context.Response.ContentType = ContentTypes.Err
            context.Response.Write(Environment.NewLine)
        End If

        ' compress output if enabled
        If EnableHttpCompression Then
            Dim encodingsAccepted As String = context.Request.Headers("Accept-Encoding")
            If Not (String.IsNullOrEmpty(encodingsAccepted)) Then
                encodingsAccepted = encodingsAccepted.ToLowerInvariant()
                If (encodingsAccepted.Contains("deflate")) Then
                    context.Response.AppendHeader("Content-Encoding", "deflate")
                    context.Response.Filter = New System.IO.Compression.DeflateStream(context.Response.Filter, System.IO.Compression.CompressionMode.Compress)
                ElseIf (encodingsAccepted.Contains("gzip")) Then
                    context.Response.AppendHeader("Content-Encoding", "gzip")
                    context.Response.Filter = New System.IO.Compression.GZipStream(context.Response.Filter, System.IO.Compression.CompressionMode.Compress)
                End If
            End If
        End If
    End Sub

    Public ReadOnly Property IsReusable() As Boolean Implements IHttpHandler.IsReusable
        Get
            Return False
        End Get
    End Property

    Public Sub WriteCompressedFile(ByVal context As HttpContext, ByVal fileName As String, ByVal folder As String)
        ' Add each file's compressed contents to the cache as it is read with a file dependency on itself
        Dim output As String = String.Empty
        If context.Cache(fileName) Is Nothing Then
            Dim filePath As String = HttpContext.Current.Server.MapPath(folder & fileName)
            Try
                output = System.IO.File.ReadAllText(filePath)
                If folder = Folders.Js Then
                    output = JavaScriptCompressor.Compress(output) & vbCrLf
                Else
                    output = CssCompressor.Compress(output) & vbCrLf
                End If
                context.Cache.Insert(fileName, output, New CacheDependency(filePath))
            Catch fnf As System.IO.FileNotFoundException
                ' throw 404?
            End Try
        Else
            output = DirectCast(HttpContext.Current.Cache(fileName), String)
        End If

        context.Response.Write(output)
    End Sub

End Class
	Example usage:
	...in <head>:
	<link rel="stylesheet" type="text/css" href="/YuiCompressor.ashx?css=reset,style" />

	...just before the </body>:
	<script type="text/javascript" src="/YuiCompressor.ashx?js=main,someotherscript"></script>

	Changelog:
	2010-02-18: Updated to support HTTP compression
	using System;
	using System.Collections.Generic;
	using System.Web;
	using Yahoo.Yui.Compressor;

	public class YuiCompressor : IHttpHandler
	{
	public const char DELIMITER = ',';
	public const bool ENABLEHTTPCOMPRESSION = true;
	public TimeSpan CacheDuration = TimeSpan.FromDays(1);

	public class ContentTypes
	{
	public const string CSS = "text/css";
	public const string JS = "application/x-javascript";
	public const string ERROR = "text/plain";
	}

	public class Folders
	{
	// customize these to your site's paths
	public const string CSS = "~/styles/";
	public const string JS = "~/scripts/";
	}

	public class Extensions
	{
	public const string CSS = ".css";
	public const string JS = ".js";
	}

	public void ProcessRequest(HttpContext context)
	{
	context.Response.ContentEncoding = System.Text.Encoding.Default;

	context.Response.Cache.SetExpires(DateTime.Now.Add(CacheDuration));
	context.Response.Cache.SetMaxAge(CacheDuration);
	context.Response.Cache.SetCacheability(HttpCacheability.Private);

	string cssFiles = context.Request.QueryString["css"];
	string jsFiles = context.Request.QueryString["js"];
	string fileName = context.Request.QueryString["f"];

	if (! string.IsNullOrEmpty(cssFiles))
	{
	// A list of CSS files has been passed in, write each file's contents to the response object
	context.Response.ContentType = ContentTypes.CSS;
	foreach (string cssFile in cssFiles.Split(DELIMITER))
	{
	WriteCompressedFile(context, cssFile + Extensions.CSS, Folders.CSS);
	}
	}
	else if (! string.IsNullOrEmpty(jsFiles))
	{
	// A list of JS files has been passed in, write each file's contents to the response object
	context.Response.ContentType = ContentTypes.JS;
	foreach (string jsFile in jsFiles.Split(DELIMITER))
	{
	WriteCompressedFile(context, jsFile + Extensions.JS, Folders.JS);
	}
	}
	else if (! string.IsNullOrEmpty(fileName))
	{
	// A specific file has been passed in, write that file's contents to the response object
	if (fileName.EndsWith(Extensions.JS))
	{
	context.Response.ContentType = ContentTypes.JS;
	WriteCompressedFile(context, fileName, Folders.JS);
	}
	else if (fileName.EndsWith(Extensions.CSS))
	{
	context.Response.ContentType = ContentTypes.CSS;
	WriteCompressedFile(context, fileName, Folders.CSS);
	}
	else
	{
	// 500?
	//Throw New System.IO.FileNotFoundException("The file specified isn't an allowed type.", fileName)
	context.Response.ContentType = ContentTypes.ERROR;
	}
	}
	else
	{
	// 404?
	//Throw New System.IO.FileNotFoundException("A filename hasn't been specified.")
	context.Response.ContentType = ContentTypes.ERROR;
	context.Response.Write(Environment.NewLine);
	}

	// compress output if enabled
	if (ENABLEHTTPCOMPRESSION)
	{
	string encodingsAccepted = context.Request.Headers("Accept-Encoding");
	if (! string.IsNullOrEmpty(encodingsAccepted))
	{
	encodingsAccepted = encodingsAccepted.ToLowerInvariant();
	if (encodingsAccepted.Contains("deflate"))
	{
	context.Response.AppendHeader("Content-Encoding", "deflate");
	context.Response.Filter = New System.IO.Compression.DeflateStream(context.Response.Filter, System.IO.Compression.CompressionMode.Compress);
	}
	else if (encodingsAccepted.Contains("gzip"))
	{
	context.Response.AppendHeader("Content-Encoding", "gzip");
	context.Response.Filter = New System.IO.Compression.GZipStream(context.Response.Filter, System.IO.Compression.CompressionMode.Compress);
	}
	}
	}
	}

	public bool IsReusable
	{
	get
	{
	return false;
	}
	}

	public void WriteCompressedFile(HttpContext context, string fileName, string folder)
	{
	// Add each file's compressed contents to the cache as it is read with a file dependency on itself
	if (context.Cache[fileName] == null)
	{
	string filePath = HttpContext.Current.Server.MapPath(folder + fileName);
	string output = string.Empty;
	try
	{
	output = System.IO.File.ReadAllText(filePath);
	if (folder == Folders.JS)
	{
	output = JavaScriptCompressor.Compress(output) + Environment.NewLine;
	}
	else
	{
	output = CssCompressor.Compress(output) + Environment.NewLine;
	}
	context.Response.Write(output);
	context.Cache.Insert(fileName, output, new System.Web.Caching.CacheDependency(filePath));
	}
	catch (System.IO.FileNotFoundException)
	{
	// throw 404?
	}
	}
	else
	{
	context.Response.Write((string) context.Cache[fileName]);
	}
	}
	}
	'<%@ WebHandler Language="VB" Class="YuiCompressor" %>

	Imports System
	Imports System.Web
	Imports Yahoo.Yui.Compressor

	Public Class YuiCompressor : Implements IHttpHandler
	Public Const Delimiter As String = ","
	Public Const EnableHttpCompression As Boolean = True
	Public cacheDuration As TimeSpan = TimeSpan.FromDays(1)

	Public Class ContentTypes
	Public Const Css As String = "text/css"
	Public Const Js As String = "application/x-javascript"
	Public Const Err As String = "text/plain"
	End Class

	Public Class Folders
	Public Const Css As String = "~/styles/"
	Public Const Js As String = "~/scripts/"
	End Class

	Public Class Extensions
	Public Const Css As String = ".css"
	Public Const Js As String = ".js"
	End Class

	Public Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest
	context.Response.ContentEncoding = Encoding.Default

	context.Response.Cache.SetExpires(DateTime.Now.Add(cacheDuration))
	context.Response.Cache.SetMaxAge(cacheDuration)
	context.Response.Cache.SetCacheability(HttpCacheability.Private)

	Dim cssFiles As String = context.Request.QueryString("css")
	Dim jsFiles As String = context.Request.QueryString("js")
	Dim fileName As String = context.Request.QueryString("f")

	If Not String.IsNullOrEmpty(cssFiles) Then
	' A list of CSS files has been passed in, write each file's contents to the response object
	context.Response.ContentType = ContentTypes.Css
	For Each cssFile As String In cssFiles.Split(Delimiter)
	WriteCompressedFile(context, cssFile & Extensions.Css, Folders.Css)
	Next
	ElseIf Not String.IsNullOrEmpty(jsFiles) Then
	' A list of JS files has been passed in, write each file's contents to the response object
	context.Response.ContentType = ContentTypes.Js
	For Each jsFile As String In jsFiles.Split(Delimiter)
	WriteCompressedFile(context, jsFile & Extensions.Js, Folders.Js)
	Next
	ElseIf Not String.IsNullOrEmpty(fileName) Then
	' A specific file has been passed in, write that file's contents to the response object
	If fileName.EndsWith(Extensions.Js) Then
	context.Response.ContentType = ContentTypes.Js
	WriteCompressedFile(context, fileName, Folders.Js)
	ElseIf fileName.EndsWith(Extensions.Css) Then
	context.Response.ContentType = ContentTypes.Css
	WriteCompressedFile(context, fileName, Folders.Css)
	Else
	' 500?
	'Throw New System.IO.FileNotFoundException("The file specified isn't an allowed type.", fileName)
	context.Response.ContentType = ContentTypes.Err
	End If
	Else
	' 404?
	'Throw New System.IO.FileNotFoundException("A filename hasn't been specified.")
	context.Response.ContentType = ContentTypes.Err
	context.Response.Write(Environment.NewLine)
	End If

	' compress output if enabled
	If EnableHttpCompression Then
	Dim encodingsAccepted As String = context.Request.Headers("Accept-Encoding")
	If Not (String.IsNullOrEmpty(encodingsAccepted)) Then
	encodingsAccepted = encodingsAccepted.ToLowerInvariant()
	If (encodingsAccepted.Contains("deflate")) Then
	context.Response.AppendHeader("Content-Encoding", "deflate")
	context.Response.Filter = New System.IO.Compression.DeflateStream(context.Response.Filter, System.IO.Compression.CompressionMode.Compress)
	ElseIf (encodingsAccepted.Contains("gzip")) Then
	context.Response.AppendHeader("Content-Encoding", "gzip")
	context.Response.Filter = New System.IO.Compression.GZipStream(context.Response.Filter, System.IO.Compression.CompressionMode.Compress)
	End If
	End If
	End If
	End Sub

	Public ReadOnly Property IsReusable() As Boolean Implements IHttpHandler.IsReusable
	Get
	Return False
	End Get
	End Property

	Public Sub WriteCompressedFile(ByVal context As HttpContext, ByVal fileName As String, ByVal folder As String)
	' Add each file's compressed contents to the cache as it is read with a file dependency on itself
	Dim output As String = String.Empty
	If context.Cache(fileName) Is Nothing Then
	Dim filePath As String = HttpContext.Current.Server.MapPath(folder & fileName)
	Try
	output = System.IO.File.ReadAllText(filePath)
	If folder = Folders.Js Then
	output = JavaScriptCompressor.Compress(output) & vbCrLf
	Else
	output = CssCompressor.Compress(output) & vbCrLf
	End If
	context.Cache.Insert(fileName, output, New CacheDependency(filePath))
	Catch fnf As System.IO.FileNotFoundException
	' throw 404?
	End Try
	Else
	output = DirectCast(HttpContext.Current.Cache(fileName), String)
	End If

	context.Response.Write(output)
	End Sub

	End Class