Update template

internal/middleware/middleware.go

@@ -0,0 +1,28 @@
+package middleware
+
+import (
+	"net/http"
+)
+
+// Middleware is a function that wraps an http.Handler with custom logic.
+type Middleware func(http.Handler) http.Handler
+
+// Chain is a helper to build up a pipeline of middlewares, then apply them to a
+// final handler.
+type Chain struct {
+	middlewares []Middleware
+}
+
+// Use appends a middleware to the chain.
+func (c *Chain) Use(m Middleware) {
+	c.middlewares = append(c.middlewares, m)
+}
+
+// Then applies the entire chain of middlewares to the final handler in reverse
+// order.
+func (c *Chain) Then(h http.Handler) http.Handler {
+	for i := len(c.middlewares) - 1; i >= 0; i-- {
+		h = c.middlewares[i](h)
+	}
+	return h
+}