From fc90d9e5896cdcccedb697fd4536f126d10f3f8e Mon Sep 17 00:00:00 2001
From: Jacob Vosmaer <contact@jacobvosmaer.nl>
Date: Thu, 3 Mar 2016 17:59:47 +0100
Subject: Tell clients/proxies to cache raw blob requests

---
 app/helpers/blob_helper.rb | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

(limited to 'app/helpers/blob_helper.rb')

diff --git a/app/helpers/blob_helper.rb b/app/helpers/blob_helper.rb
index 7f63a2e2cb4..adb56e49c62 100644
--- a/app/helpers/blob_helper.rb
+++ b/app/helpers/blob_helper.rb
@@ -152,4 +152,29 @@ module BlobHelper
       'application/octet-stream'
     end
   end
+
+  def set_cache_headers
+    if @project.visibility_level == Project::PUBLIC
+      cache_control = 'public, '
+    else
+      cache_control = 'private, '
+    end
+
+    if @ref && @commit && @ref == @commit.id
+      # This is a link to a commit by its commit SHA. That means that the blob
+      # is immutable.
+      cache_control << 'max-age=600' # 10 minutes
+    else
+      # A branch or tag points at this blob. That means that the expected blob
+      # value may change over time.
+      cache_control << 'max-age=60' # 1 minute
+    end
+
+    headers['Cache-Control'] = cache_control
+    headers['ETag'] = @blob.id
+  end
+
+  def check_etag!
+    stale?(etag: @blob.id)
+  end
 end
-- 
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