Enhance log display behavior and menu state management

src/internal/authentication/authentication.go

@@ -7,6 +7,7 @@ import (
 	"net/http"
 	"os"
 	"path/filepath"
+	"sync"
 
 	"crypto/hmac"
 	"crypto/rand"
@@ -29,6 +30,7 @@ var databaseFile = "authentication.json"
 
 var data = make(map[string]any)
 var tokens = make(map[string]any)
+var tokensMu sync.RWMutex
 
 var initAuthentication = false
 
@@ -256,20 +258,21 @@ func CheckTheValidityOfTheToken(token string) (newToken string, err error) {
 
 	err = createError(011)
 
+	tokensMu.Lock()
+	defer tokensMu.Unlock()
+
 	if v, ok := tokens[token]; ok {
-		var expires = v.(map[string]any)["expires"].(time.Time)
-		var userID = v.(map[string]any)["id"].(string)
+		expires := v.(map[string]any)["expires"].(time.Time)
 
 		if expires.Sub(time.Now().Local()) < 0 {
+			delete(tokens, token)
 			return
 		}
 
-		newToken = setToken(userID, token)
-
+		// Keep a stable token per session and only refresh expiration.
+		v.(map[string]any)["expires"] = time.Now().Local().Add(time.Minute * time.Duration(tokenValidity))
+		newToken = token
 		err = nil
-
-	} else {
-		return
 	}
 
 	return
@@ -285,11 +288,15 @@ func GetUserID(token string) (userID string, err error) {
 
 	err = createError(002)
 
+	tokensMu.Lock()
+	defer tokensMu.Unlock()
+
 	if v, ok := tokens[token]; ok {
-		var expires = v.(map[string]any)["expires"].(time.Time)
+		expires := v.(map[string]any)["expires"].(time.Time)
 		userID = v.(map[string]any)["id"].(string)
 
 		if expires.Sub(time.Now().Local()) < 0 {
+			delete(tokens, token)
 			return
 		}
 
@@ -558,7 +565,12 @@ func defaultsForNewUser(username, password string) map[string]any {
 }
 
 func setToken(id, oldToken string) (newToken string) {
-	delete(tokens, oldToken)
+	tokensMu.Lock()
+	defer tokensMu.Unlock()
+
+	if oldToken != "-" {
+		delete(tokens, oldToken)
+	}
 
 loopToken:
 	newToken = randomString(tokenLength)