feat(security): add safe path check for log file access and validation

app/utils/security.py

@@ -0,0 +1,36 @@
+from pathlib import Path
+from typing import Optional, Set
+
+
+class SecurityUtils:
+
+    @staticmethod
+    def is_safe_path(base_path: Path, user_path: Path, allowed_suffixes: Optional[Set[str]] = None) -> bool:
+        """
+        验证用户提供的路径是否在基准目录内，并检查文件类型是否合法，防止目录遍历攻击
+
+        :param base_path: 基准目录，允许访问的根目录
+        :param user_path: 用户提供的路径，需检查其是否位于基准目录内
+        :param allowed_suffixes: 允许的文件后缀名集合，用于验证文件类型
+        :return: 如果用户路径安全且位于基准目录内，且文件类型合法，返回 True；否则返回 False
+        :raises Exception: 如果解析路径时发生错误，则捕获并记录异常
+        """
+        try:
+            # resolve() 将相对路径转换为绝对路径，并处理符号链接和'..'
+            base_path_resolved = base_path.resolve()
+            user_path_resolved = user_path.resolve()
+
+            # 检查用户路径是否在基准目录或基准目录的子目录内
+            if base_path_resolved != user_path_resolved and base_path_resolved not in user_path_resolved.parents:
+                return False
+
+            # 如果指定了 allowed_suffixes，进一步检查文件后缀
+            if allowed_suffixes and user_path.is_file() and user_path.suffix not in allowed_suffixes:
+                return False
+
+            # 所有检查通过
+            return True
+        except Exception as e:
+            # 捕获并记录路径解析时的异常
+            print(f"Error occurred while resolving paths: {e}")
+            return False