added firewall strategy pattern

src/firewall/fwtype.py

@@ -0,0 +1,40 @@
+from abc import ABC, abstractmethod
+from typing import Dict, Type
+
+
+class FWType(ABC):
+    """Abstract base class for firewall types."""
+
+    # Registry to store child classes
+    _registry: Dict[str, Type['FWType']] = {}
+
+    def __init_subclass__(cls, **kwargs):
+        """Automatically register subclasses with their class name."""
+        super().__init_subclass__(**kwargs)
+        cls._registry[cls.__name__.lower()] = cls
+
+    @classmethod
+    def create(cls, fw_type: str, **kwargs) -> 'FWType':
+        """
+        Factory method to create instances of child classes.
+
+        Args:
+            fw_type: String name of the firewall type class to instantiate
+            **kwargs: Arguments to pass to the child class constructor
+
+        Returns:
+            Instance of the requested child class
+
+        Raises:
+            ValueError: If fw_type is not registered
+        """
+        fw_type = fw_type.lower()
+        if fw_type not in cls._registry:
+            available = ', '.join(cls._registry.keys())
+            raise ValueError(f"Unknown firewall type: '{fw_type}'. Available: {available}")
+
+        return cls._registry[fw_type](**kwargs)
+
+    @abstractmethod
+    def getBanlist(self,ips):
+        """Return the ruleset for the specific server"""