From db5845a8d76f704032a66bed2daba6c2c3cf702e Mon Sep 17 00:00:00 2001
From: Sukhorukov Anton <anton.sukhorukov@onlyoffice.com>
Date: Fri, 26 Jan 2024 12:28:23 +0300
Subject: [PATCH] filehandler: add range in stream

---
 .../ASC.Files/Core/HttpHandlers/FileHandler.ashx.cs  | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/products/ASC.Files/Core/HttpHandlers/FileHandler.ashx.cs b/products/ASC.Files/Core/HttpHandlers/FileHandler.ashx.cs
index e50d1f428aa..20e88c39f43 100644
--- a/products/ASC.Files/Core/HttpHandlers/FileHandler.ashx.cs
+++ b/products/ASC.Files/Core/HttpHandlers/FileHandler.ashx.cs
@@ -780,15 +780,13 @@ private async Task StreamFileAsync<T>(HttpContext context, T id)
                 return;
             }
 
-            context.Response.Headers.Add("Content-Disposition", ContentDispositionUtil.GetHeaderValue(file.Title));
-            context.Response.ContentType = MimeMapping.GetMimeMapping(file.Title);
+            long offset = 0;
+            var length = ProcessRangeHeader(context, file.ContentLength, ref offset);
 
             await using var stream = await fileDao.GetFileStreamAsync(file);
-            context.Response.Headers.Add("Content-Length",
-                stream.CanSeek
-                ? stream.Length.ToString(CultureInfo.InvariantCulture)
-                : file.ContentLength.ToString(CultureInfo.InvariantCulture));
-            await stream.CopyToAsync(context.Response.Body);
+            stream.Seek(offset, SeekOrigin.Begin);
+
+            await SendStreamByChunksAsync(context, length, file.Title, stream, true);
         }
         catch (Exception ex)
         {