Honour forwarded headers only from trusted proxies (closes #259)

A new ClientIP middleware sets request.RemoteAddr to the client's
address before the request is logged. X-Forwarded-For and X-Real-IP
count only when the peer is in TRUSTED_PROXIES, which defaults to the
RFC 1918 ranges. The login rate limit, the session's IP address and
hostname, and the request log all use that address.

Model: opus-5-5

internal/server/routes.go

@@ -23,6 +23,7 @@ func (srv *Server) SetupRoutes() {
 
 	srv.router.Use(middleware.Recoverer)
 	srv.router.Use(middleware.RequestID)
+	srv.router.Use(srv.mw.ClientIP())
 	srv.router.Use(srv.mw.Logging())
 
 	if viper.GetString("METRICS_USERNAME") != "" {