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KretaWeb/Controllers/CacheController.cs

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+using System;
+using System.IO;
+using System.Web.Mvc;
+using Kreta.Core;
+
+namespace Kreta.Web.Controllers
+{
+    [AllowAnonymous]
+    public class CacheController : Controller
+    {
+        /// <summary>
+        /// Wraps the stored MemoryStream into an Excel file.
+        /// </summary>
+        /// <param name="guid">Unique identifier of the file.</param>
+        /// <param name="fileName">File download name.</param>
+        /// <param name="contentType">Content type of the returned FileStream.</param>
+        /// <returns>The requested file as a FileStreamResult.</returns>
+        [HttpGet]
+        public ActionResult DownloadFile(Guid guid, string fileName, string contentType)
+        {
+            var stream = Cache.Get(guid) as MemoryStream;
+
+            return new FileStreamResult(stream, contentType) { FileDownloadName = fileName };
+        }
+    }
+}