feat(validators): add FileSizeValidator

sage_tools/validators/file.py

@@ -0,0 +1,37 @@
+from django.core.exceptions import ValidationError
+
+from sage_tools.utils.converters import UnitConvertor
+
+
+class FileSizeValidator:
+    def __init__(self, max_size):
+        """
+        Initialize the validator with the maximum file size.
+
+        Args:
+        max_size (int): Maximum file size in bytes.
+        """
+        self.max_size = max_size
+
+    def __call__(self, value):
+        """
+        Check the file size and raise a ValidationError if it exceeds the limit.
+
+        Args:
+        value (File): The file being uploaded.
+        """
+        size = UnitConvertor.convert_byte_to_megabyte(self.max_size)
+        if value.size > self.max_size:
+            raise ValidationError(f"File size must not exceed {size} MB.")
+
+    def deconstruct(self):
+        """
+        Deconstruct the validator for serialization.
+
+        Returns:
+            tuple: The full path of the object, positional arguments, and keyword arguments.
+        """
+        path = f"{self.__module__}.{self.__class__.__name__}"
+        args = (self.max_size,)
+        kwargs = {}
+        return path, args, kwargs