fix: reduce auth logging detail

Author: mamchurovskyy

src/app/app.go

@@ -10,20 +10,24 @@ import (
 	"go-http-server/util"
 	"golang.org/x/exp/slices"
 	"io"
+	"log/slog"
 	"mime"
 	"net/http"
 	"os"
 	"path"
 	"path/filepath"
 	"strings"
+	"sync"
 	"time"
 )
 
 type App struct {
-	params         *param.Params
-	server         *http.Server
-	cache          *lru.TwoQueueCache
-	listenAndServe func(*http.Server) error
+	params             *param.Params
+	server             *http.Server
+	cache              *lru.TwoQueueCache
+	listenAndServe     func(*http.Server) error
+	authLoggerInstance *slog.Logger
+	authLoggerOnce     sync.Once
 }
 
 type ResponseItem struct {
@@ -64,10 +68,11 @@ func NewAppWithListenAndServe(params *param.Params, listenAndServe func(*http.Se
 	}
 
 	return App{
-		params:         params,
-		server:         nil,
-		cache:          cache,
-		listenAndServe: listenAndServe,
+		params:             params,
+		server:             nil,
+		cache:              cache,
+		listenAndServe:     listenAndServe,
+		authLoggerInstance: nil,
 	}
 }
 

src/app/auth.go

@@ -45,9 +45,8 @@ func (app *App) BasicAuthMiddleware(next http.Handler) http.Handler {
 				logger.Info("[AUTH] failure",
 					"path", r.URL.Path,
 					"remoteAddr", r.RemoteAddr,
+					"authProvided", ok,
 					"userProvided", user != "",
-					"matchedUser", userMatch,
-					"matchedPass", passMatch,
 				)
 			}
 			return
@@ -70,21 +69,26 @@ func (app *App) authLogger() *slog.Logger {
 		return nil
 	}
 
-	level := slog.LevelInfo
-	switch strings.ToLower(os.Getenv("LOG_LEVEL")) {
-	case "debug":
-		level = slog.LevelDebug
-	case "warn", "warning":
-		level = slog.LevelWarn
-	case "error":
-		level = slog.LevelError
-	}
+	app.authLoggerOnce.Do(func() {
+		level := slog.LevelInfo
+		switch strings.ToLower(os.Getenv("LOG_LEVEL")) {
+		case "debug":
+			level = slog.LevelDebug
+		case "warn", "warning":
+			level = slog.LevelWarn
+		case "error":
+			level = slog.LevelError
+		}
 
-	opts := &slog.HandlerOptions{Level: level}
-	if app.params.LogPretty {
-		return slog.New(slog.NewTextHandler(os.Stdout, opts))
-	}
-	return slog.New(slog.NewJSONHandler(os.Stdout, opts))
+		opts := &slog.HandlerOptions{Level: level}
+		if app.params.LogPretty {
+			app.authLoggerInstance = slog.New(slog.NewTextHandler(os.Stdout, opts))
+		} else {
+			app.authLoggerInstance = slog.New(slog.NewJSONHandler(os.Stdout, opts))
+		}
+	})
+
+	return app.authLoggerInstance
 }
 
 func constantTimeStringMatch(a string, b string) bool {