explorer-monorepo/backend/api/rest/middleware.go

package rest

import (
	"log"
	"net/http"
	"time"
)

// responseWriter wraps http.ResponseWriter to capture status code
type responseWriter struct {
	http.ResponseWriter
	statusCode int
}

func (rw *responseWriter) WriteHeader(code int) {
	rw.statusCode = code
	rw.ResponseWriter.WriteHeader(code)
}

func (rw *responseWriter) Unwrap() http.ResponseWriter {
	return rw.ResponseWriter
}

func (rw *responseWriter) Flush() {
	if f, ok := rw.ResponseWriter.(http.Flusher); ok {
		f.Flush()
	}
}

// loggingMiddleware logs requests with timing
func (s *Server) loggingMiddleware(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		start := time.Now()
		wrapped := &responseWriter{ResponseWriter: w, statusCode: http.StatusOK}

		next.ServeHTTP(wrapped, r)

		duration := time.Since(start)
		// Log request (in production, use structured logger)
		log.Printf("%s %s %d %v", r.Method, r.URL.Path, wrapped.statusCode, duration)
	})
}

// compressionMiddleware is a pass-through today; it exists so that the
// routing stack can be composed without conditionals while we evaluate the
// right compression approach (likely gorilla/handlers.CompressHandler in a
// follow-up). Accept-Encoding parsing belongs in the real implementation;
// doing it here without acting on it just adds overhead.
func (s *Server) compressionMiddleware(next http.Handler) http.Handler {
	return next
}