Dynamic link loading algorithm

Question

I saw a couple of sites that have a dynamic download link.

They request a valid email address and send a dynamically generated download link to that address. EX www.mysite.domain / hashvalue1

But how do they do it, since the file exists in the domain in a specific place? www.mysite.domain / downloads

Is there any guidebook?

Answer 1

Yes, the web URL does not have to match the actual location of the file. The easiest way to implement this in .NET is to create an IHttpHandler that uses a Response.TransmitFile based on a hash value.

URL- : www.mysite.domain/file.ashx? hash = hashvalue1.

URL-, Routing (ASP.NET 3.5 SP1) - URL-.

Answer 2

"UrlRewrite" ASP.NET HttpHandler.

UrlRewrite: http://weblogs.asp.net/scottgu/archive/2007/02/26/tip-trick-url-rewriting-with-asp-net.aspx

: Downlaod.ashx

using System;
using System.Web;

public class GetDownload : IHttpHandler 
{
    private static string file = "your file location";
    public void ProcessRequest (HttpContext context) 
    {
        if(UsersHasRights(context)) 
        {
            context.Response.TransmitFile(file);
        }
    }

    public bool IsReusable 
    {
        get { return false; }
    }
}

Answer 3

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You can send a link to a user, such as this site.com/files.dld?hash, and implement IHttpHandler to handle this extension (see this answer by Andrey Shchekin). Here is also an article describing how to use HttpHandler to download zip files.