Initial commit: LAN Manager with Go backend and Vue frontend

server/middleware/auth.go

@@ -0,0 +1,53 @@
+package middleware
+
+import (
+	"net/http"
+
+	"github.com/gin-contrib/sessions"
+	"github.com/gin-gonic/gin"
+)
+
+const AdminSessionKey = "admin_user"
+
+func AuthRequired() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		session := sessions.Default(c)
+		user := session.Get(AdminSessionKey)
+		if user == nil {
+			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "unauthorized"})
+			return
+		}
+		c.Set("admin_user", user.(string))
+		c.Set("is_admin", true)
+		c.Next()
+	}
+}
+
+func OptionalAuth() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		session := sessions.Default(c)
+		if user := session.Get(AdminSessionKey); user != nil {
+			c.Set("admin_user", user.(string))
+			c.Set("is_admin", true)
+		} else {
+			c.Set("is_admin", false)
+		}
+		c.Next()
+	}
+}
+
+func IsAdmin(c *gin.Context) bool {
+	v, exists := c.Get("is_admin")
+	if !exists {
+		return false
+	}
+	return v.(bool)
+}
+
+func CurrentUser(c *gin.Context) string {
+	u, _ := c.Get("admin_user")
+	if u == nil {
+		return ""
+	}
+	return u.(string)
+}

server/middleware/log.go

@@ -0,0 +1,19 @@
+package middleware
+
+import (
+	"encoding/json"
+	"lan-manager/server/db"
+)
+
+func LogOperation(action, entityType string, entityID *int64, entityName, oldValue, newValue, sourceIP, username string) {
+	_, _ = db.DB.Exec(
+		`INSERT INTO operation_logs (action, entity_type, entity_id, entity_name, old_value, new_value, source_ip, username)
+		 VALUES (?, ?, ?, ?, ?, ?, ?, ?)`,
+		action, entityType, entityID, entityName, oldValue, newValue, sourceIP, username,
+	)
+}
+
+func ToJSON(v interface{}) string {
+	b, _ := json.Marshal(v)
+	return string(b)
+}