MediaDownloadHttpHandler.cs

[TemplateDescriptor(Inherited = true, TemplateTypeCategory = TemplateTypeCategories.HttpHandler)]
public class MediaDownloadHttpHandler : BlobHttpHandler, IRenderTemplate<DocumentFileMediaType>
{
	public new bool IsReusable
	{
		get { return false; }
	}

	protected override Blob GetBlob(HttpContextBase context)
	{
		var routeHelper = ServiceLocator.Current.GetInstance<ContentRouteHelper>();

		//Get file content
		var content = routeHelper.Content;

		if (content == null)
		  throw new HttpException(404, "Not Found.");		
		
		//ACCESS CHECK OR DOWNLOAD TRACKING IMPLEMENTED HERE

		//Set caching policy
		context.Response.Cache.SetCacheability(HttpCacheability.Private);
		context.Response.Cache.SetMaxAge(TimeSpan.FromDays(1));

		//Get name of file
		var downLoadFileName = context.Request.RequestContext.GetCustomRouteData<string>(DownloadMediaRouter.DownloadSegment);
		
		if (!string.IsNullOrEmpty(downLoadFileName))
		{
			//Ensure that the file is being downloaded
			context.Response.AppendHeader("Content-Disposition", string.Format("attachment; filename=\"{0}\"", downLoadFileName));
		}

		var binaryStorable = content as IBinaryStorable;

		return binaryStorable != null ? binaryStorable.BinaryData : null;
	}
}