From 4a731904d82e6845a443fb43046ffed8ba1a2adf Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jonas=20Sch=C3=A4fer?= <jonas@zombofant.net>
Date: Sun, 22 Dec 2024 11:08:09 +0100
Subject: [PATCH] Implement middleware for &T: Middleware<_>

That allows to pass middlewares with their configuration around at
application setup time without having to clone them.
---
 poem/src/middleware/mod.rs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/poem/src/middleware/mod.rs b/poem/src/middleware/mod.rs
index bbc072b9a2..5cb3e0e61d 100644
--- a/poem/src/middleware/mod.rs
+++ b/poem/src/middleware/mod.rs
@@ -301,6 +301,14 @@ impl<E: Endpoint> Middleware<E> for () {
     }
 }
 
+impl<E: Endpoint, T: Middleware<E>> Middleware<E> for &T {
+    type Output = T::Output;
+
+    fn transform(&self, ep: E) -> Self::Output {
+        T::transform(self, ep)
+    }
+}
+
 /// A middleware that combines two middlewares.
 pub struct CombineMiddleware<A, B, E> {
     a: A,