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<%@ WebHandler Language="VB" Class="imgur" %>

Imports System
Imports System.Web
Imports System.Net
Imports System.IO

Public Class imgur : Implements IHttpHandler

    Public Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest
        If context.Request.QueryString.Count = 0 Then Exit Sub

        Dim remoteWebSite As String = "http://imgur.com/"
        Dim imageName = context.Request.QueryString(0)


        If Not Regex.IsMatch(imageName, "(.*?)\.(jpg|jpeg|png|gif)$", RegexOptions.IgnoreCase) Then
            context.Response.Write("<h2>doesn't look like an image to me :(</h2>")
            context.Response.End()
            Return
        End If


        Dim request = WebRequest.Create(remoteWebSite & imageName)
        Dim response As HttpWebResponse

        Try
            response = request.GetResponse
        Catch ex As WebException
            context.Response.Write("<h2>Image not found</h2>")
            context.Response.End()
            Return
        End Try

        If response.ContentType = "text/html" Then
            context.Response.Write("<h2>Image not found</h2>")
            context.Response.End()
            Return
        End If


        Using recieveStream = response.GetResponseStream

            Dim length = 256
            Dim buffer = New Byte(length) {}
            Dim bytesRead = recieveStream.Read(buffer, 0, length)

            While bytesRead > 0
                context.Response.OutputStream.Write(buffer, 0, bytesRead)
                bytesRead = recieveStream.Read(buffer, 0, length)
            End While

        End Using


        context.Response.ContentType = response.ContentType
        response.Close()
        context.Response.End()


    End Sub

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

End Class