Update chi/middleware to chi/v5/middleware (#17888)

Fix #17880


Co-authored-by: Lauris BH <lauris@nix.lv>

vendor/github.com/go-chi/chi/v5/middleware/timeout.go

@@ -0,0 +1,49 @@
+package middleware
+
+import (
+	"context"
+	"net/http"
+	"time"
+)
+
+// Timeout is a middleware that cancels ctx after a given timeout and return
+// a 504 Gateway Timeout error to the client.
+//
+// It's required that you select the ctx.Done() channel to check for the signal
+// if the context has reached its deadline and return, otherwise the timeout
+// signal will be just ignored.
+//
+// ie. a route/handler may look like:
+//
+//  r.Get("/long", func(w http.ResponseWriter, r *http.Request) {
+// 	 ctx := r.Context()
+// 	 processTime := time.Duration(rand.Intn(4)+1) * time.Second
+//
+// 	 select {
+// 	 case <-ctx.Done():
+// 	 	return
+//
+// 	 case <-time.After(processTime):
+// 	 	 // The above channel simulates some hard work.
+// 	 }
+//
+// 	 w.Write([]byte("done"))
+//  })
+//
+func Timeout(timeout time.Duration) func(next http.Handler) http.Handler {
+	return func(next http.Handler) http.Handler {
+		fn := func(w http.ResponseWriter, r *http.Request) {
+			ctx, cancel := context.WithTimeout(r.Context(), timeout)
+			defer func() {
+				cancel()
+				if ctx.Err() == context.DeadlineExceeded {
+					w.WriteHeader(http.StatusGatewayTimeout)
+				}
+			}()
+
+			r = r.WithContext(ctx)
+			next.ServeHTTP(w, r)
+		}
+		return http.HandlerFunc(fn)
+	}
+}