[feature/backend] implement /users handler + switch to username + add display name + user management cli

backend/internal/middleware/accesslog.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"os"
 	"path/filepath"
+	"strings"
 	"time"
 
 	"github.com/gin-gonic/gin"
@@ -78,26 +79,41 @@ func newAccessLogger(config *types.AccessLogConfig) (*accessLogger, error) {
 
 	// 配置文件日志
 	if config.EnableFile {
-		// 确保日志目录存在
-		if err := os.MkdirAll(filepath.Dir(config.FilePath), 0755); err != nil {
+		// 验证文件路径
+		if config.FilePath == "" {
+			return nil, fmt.Errorf("file path cannot be empty")
+		}
+
+		// 验证路径是否包含无效字符
+		if strings.ContainsAny(config.FilePath, "\x00") {
+			return nil, fmt.Errorf("file path contains invalid characters")
+		}
+
+		dir := filepath.Dir(config.FilePath)
+
+		// 检查目录是否存在或是否可以创建
+		if err := os.MkdirAll(dir, 0755); err != nil {
 			return nil, fmt.Errorf("failed to create log directory: %w", err)
 		}
 
-		// 配置日志轮转
+		// 尝试打开或创建文件，验证路径是否有效且有写入权限
+		file, err := os.OpenFile(config.FilePath, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0666)
+		if err != nil {
+			return nil, fmt.Errorf("failed to open or create log file: %w", err)
+		}
+		file.Close()
+
+		// 配置文件日志
 		logWriter = &lumberjack.Logger{
 			Filename:   config.FilePath,
 			MaxSize:    config.Rotation.MaxSize,    // MB
-			MaxAge:     config.Rotation.MaxAge,     // days
-			MaxBackups: config.Rotation.MaxBackups, // files
+			MaxBackups: config.Rotation.MaxBackups, // 文件个数
+			MaxAge:     config.Rotation.MaxAge,     // 天数
 			Compress:   config.Rotation.Compress,   // 是否压缩
 			LocalTime:  config.Rotation.LocalTime,  // 使用本地时间
 		}
 
-		logger := zerolog.New(logWriter).
-			With().
-			Timestamp().
-			Logger()
-
+		logger := zerolog.New(logWriter).With().Timestamp().Logger()
 		fileLogger = &logger
 	}