From be076616cc3fda445d511487362901ec3dd458c3 Mon Sep 17 00:00:00 2001
From: Zoe Roux <zoe.roux@zoriya.dev>
Date: Thu, 7 Sep 2023 21:57:45 +0200
Subject: [PATCH] Add cache policy to images

---
 back/src/Kyoo.Core/Views/Helper/CrudThumbsApi.cs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/back/src/Kyoo.Core/Views/Helper/CrudThumbsApi.cs b/back/src/Kyoo.Core/Views/Helper/CrudThumbsApi.cs
index 4674b6ff..697e75cc 100644
--- a/back/src/Kyoo.Core/Views/Helper/CrudThumbsApi.cs
+++ b/back/src/Kyoo.Core/Views/Helper/CrudThumbsApi.cs
@@ -68,6 +68,14 @@ namespace Kyoo.Core.Api
 			string path = _thumbs.GetImagePath(resource, image, quality ?? ImageQuality.High);
 			if (path == null || !System.IO.File.Exists(path))
 				return NotFound();
+
+			if (!identifier.Match(id => false, slug => slug == "random"))
+			{
+				// Allow clients to cache the image for 6 month.
+				Response.Headers.Add("Cache-Control", $"public, max-age={60 * 60 * 24 * 31 * 6}");
+			}
+			else
+				Response.Headers.Add("Cache-Control", $"public, no-store");
 			return PhysicalFile(Path.GetFullPath(path), "image/webp", true);
 		}