Add Zip download link

Core/Entities/LeafInput.cs

@@ -1,6 +1,8 @@
 using System;
 using System.Collections.Generic;
 using System.ComponentModel.DataAnnotations;
+using System.IO;
+using System.IO.Compression;
 using System.Linq;
 
 namespace LeafWeb.Core.Entities
@@ -41,5 +43,24 @@ namespace LeafWeb.Core.Entities
 		{
 			return $"{Id}_{Identifier}";
 		}
+
+		/// <summary>
+		/// Contains all output files in a zip
+		/// </summary>
+		public byte[] GetOutputFileZip()
+		{
+			using (var compressedFileStream = new MemoryStream())
+			using (var archive = new ZipArchive(compressedFileStream, ZipArchiveMode.Create, true))
+			{
+				foreach (var outputFile in OutputFiles)
+				{
+					var entry = archive.CreateEntry(outputFile.Filename);
+					using (var originalFileStream = new MemoryStream(outputFile.Contents))
+					using (var entryStream = entry.Open())
+						originalFileStream.CopyTo(entryStream);
+				}
+				return compressedFileStream.ToArray();
+			}
+		}
 	}
 }