new: Add helper for ASN object

pymisp/tools/__init__.py

@@ -13,6 +13,7 @@ from .openioc import load_openioc, load_openioc_file  # noqa
 from .sbsignatureobject import SBSignatureObject  # noqa
 from .fail2banobject import Fail2BanObject  # noqa
 from .domainipobject import DomainIPObject  # noqa
+from .asnobject import ASNObject  # noqa
 
 if sys.version_info >= (3, 6):
     from .emailobject import EMailObject  # noqa

pymisp/tools/asnobject.py

@@ -0,0 +1,22 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+from .abstractgenerator import AbstractMISPObjectGenerator
+import logging
+
+logger = logging.getLogger('pymisp')
+
+
+class ASNObject(AbstractMISPObjectGenerator):
+
+    def __init__(self, parameters, strict=True, standalone=True, **kwargs):
+        super(ASNObject, self).__init__('asn', strict=strict, standalone=standalone, **kwargs)
+        self._parameters = parameters
+        self.generate_attributes()
+
+    def generate_attributes(self):
+        first = self._sanitize_timestamp(self._parameters.pop('first-seen', None))
+        self._parameters['first-seen'] = first
+        last = self._sanitize_timestamp(self._parameters.pop('last-seen', None))
+        self._parameters['last-seen'] = last
+        return super(ASNObject, self).generate_attributes()