From ac9625c0aa73d6f63eb826a1fbbe135054707d55 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Karol=20W=C3=B3jcik?= <karol.wojcik@tuta.io>
Date: Wed, 15 Sep 2021 17:42:37 +0200
Subject: [PATCH] Add support for GraalVM ResourceURLConnection

GraalVM native-image produces the binary with embedded resources from
jar:. The protocol is then substituted to resource:.
---
 ring-core/src/ring/util/response.clj | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/ring-core/src/ring/util/response.clj b/ring-core/src/ring/util/response.clj
index a638f7a27..d38914e46 100644
--- a/ring-core/src/ring/util/response.clj
+++ b/ring-core/src/ring/util/response.clj
@@ -289,6 +289,14 @@
     (if-not (zero? last-mod)
       (Date. last-mod))))
 
+(defmethod resource-data :resource
+  [^java.net.URL url]
+  ;; GraalVM resource scheme
+  (let [resource     (.openConnection url)]
+    {:content        (.getInputStream resource)
+     :content-length (connection-content-length resource)
+     :last-modified  (connection-last-modified resource)}))
+
 (defmethod resource-data :jar
   [^java.net.URL url]
   (let [conn (.openConnection url)]