Refactor module_utils/crypto.py (#27)

* Refactor module_utils/crypto.py: split up into multiple smaller modules

* Remove superfluous files.

* Fix sanity errors.

* Move CRL entry dumping code to module_utils.

* Move obj2txt usage from CRL modules to module_utils/crpyto/cryptography_crl.

* Move generic I/O functions to plugins/module_utils/io.py.

* Add helper method for retrieving serial number of certificate.

* Add compatibility code into __init__.py.

* Fix syntax error, and add ignore.txt entries for non-empty __init__.

plugins/module_utils/crypto/_objects.py

@@ -0,0 +1,46 @@
+# -*- coding: utf-8 -*-
+#
+# (c) 2019, Felix Fontein <felix@fontein.de>
+#
+# Ansible is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# Ansible is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
+
+from __future__ import absolute_import, division, print_function
+__metaclass__ = type
+
+
+from ._objects_data import OID_MAP
+
+OID_LOOKUP = dict()
+NORMALIZE_NAMES = dict()
+NORMALIZE_NAMES_SHORT = dict()
+
+for dotted, names in OID_MAP.items():
+    for name in names:
+        if name in NORMALIZE_NAMES and OID_LOOKUP[name] != dotted:
+            raise AssertionError(
+                'Name collision during setup: "{0}" for OIDs {1} and {2}'
+                .format(name, dotted, OID_LOOKUP[name])
+            )
+        NORMALIZE_NAMES[name] = names[0]
+        NORMALIZE_NAMES_SHORT[name] = names[-1]
+        OID_LOOKUP[name] = dotted
+for alias, original in [('userID', 'userId')]:
+    if alias in NORMALIZE_NAMES:
+        raise AssertionError(
+            'Name collision during adding aliases: "{0}" (alias for "{1}") is already mapped to OID {2}'
+            .format(alias, original, OID_LOOKUP[alias])
+        )
+    NORMALIZE_NAMES[alias] = original
+    NORMALIZE_NAMES_SHORT[alias] = NORMALIZE_NAMES_SHORT[original]
+    OID_LOOKUP[alias] = OID_LOOKUP[original]