From 02f5703e3c0bccdee8101889a2d4abe42feb015d Mon Sep 17 00:00:00 2001
From: Matija Obreza <matija.obreza@croptrust.org>
Date: Mon, 17 Sep 2018 06:55:44 +0200
Subject: [PATCH] Tile server HTTP cache header maxAge depends on zoom level

---
 .../genesys2/server/api/v1/TileController.java  | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/src/main/java/org/genesys2/server/api/v1/TileController.java b/src/main/java/org/genesys2/server/api/v1/TileController.java
index 9b0e65ea5..536c08e78 100644
--- a/src/main/java/org/genesys2/server/api/v1/TileController.java
+++ b/src/main/java/org/genesys2/server/api/v1/TileController.java
@@ -56,7 +56,20 @@ public class TileController {
 
         response.setContentType(MediaType.IMAGE_PNG_VALUE);
         response.setContentLength(image.length);
-        response.setHeader(HttpHeaders.CACHE_CONTROL, "max-age=3600, s-maxage=3600, public, no-transform");
-        response.getOutputStream().write(image, 0, image.length);
+
+		// HTTP maxAge
+		int maxAge;
+		if (zoom < 4) {
+			maxAge = 60 * 60 * 24; // 24 hrs
+		} else if (zoom < 6) {
+			maxAge = 60 * 60 * 2; // 2 hrs
+		} else if (zoom < 8) {
+			maxAge = 60 * 60; // 1 hr
+		} else {
+			maxAge = 60 * 5; // 5 min
+		}
+		response.setHeader(HttpHeaders.CACHE_CONTROL, "max-age=" + maxAge + ", s-maxage=" + maxAge + ", public, no-transform");
+		response.getOutputStream().write(image, 0, image.length);
+		response.getOutputStream().flush();
     }
 }
-- 
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