From 52632800856ce28a3461d45dc16971fcd0527304 Mon Sep 17 00:00:00 2001
From: Julien Oculi <xdrz.jot.sr@gmail.com>
Date: Thu, 11 Jul 2024 12:22:22 +0200
Subject: [PATCH] feat(backend): :zap: add well cache control for assets

---
 .gitignore              |  1 +
 routes/_middleware.ts   |  4 +++-
 src/cache/middleware.ts | 19 +++++++++++++++++++
 3 files changed, 23 insertions(+), 1 deletion(-)
 create mode 100644 src/cache/middleware.ts

diff --git a/.gitignore b/.gitignore
index 9e47da6..734b297 100644
--- a/.gitignore
+++ b/.gitignore
@@ -18,3 +18,4 @@ static/dev
 
 # Dev cache files
 cache/
+!src/cache/
diff --git a/routes/_middleware.ts b/routes/_middleware.ts
index 2f117af..99b7e64 100644
--- a/routes/_middleware.ts
+++ b/routes/_middleware.ts
@@ -1,4 +1,5 @@
 import { FreshContext } from '$fresh/server.ts'
+import { useCache } from ':src/cache/middleware.ts'
 import { useCsp } from ':src/csp/middleware.ts'
 import { useSecurityHeaders } from ':src/security_headers/middleware.ts'
 import { useServiceworker } from ':src/serviceworker/middleware.ts'
@@ -16,7 +17,8 @@ export async function handler(request: Request, ctx: FreshContext) {
 	useSecurityHeaders(request, response, ctx)
 	await useCsp(request, response, ctx)
 	useSession(request, response, ctx)
-	useServiceworker(request, response, ctx)	
+	useServiceworker(request, response, ctx)
+	useCache(request, response, ctx)
 
 	return response
 }
diff --git a/src/cache/middleware.ts b/src/cache/middleware.ts
new file mode 100644
index 0000000..b714f66
--- /dev/null
+++ b/src/cache/middleware.ts
@@ -0,0 +1,19 @@
+import { FreshContext } from '$fresh/server.ts'
+
+export function useCache(
+    _request: Request,
+    response: Response,
+    ctx: FreshContext,
+) {
+    if (ctx.config.dev) return
+    if (
+        ctx.url.pathname.match(
+            /(.+\.|_)((css)|(ttf)|(woff2)|(png)|(svg)|(jpe?g)|(avif))/,
+        )
+    ) {
+        response.headers.set(
+            'Cache-Control',
+            'public, max-age=31536000, immutable',
+        )
+    }
+}