New filter plugin - unicode_normalization (#3359)

* Initial commit

* Adding maintainer in BOTMETA

* Adding changelog fragment

* Updating filter_guide

* Applying initial review suggestions

plugins/filter/unicode_normalize.py

@@ -0,0 +1,40 @@
+# -*- coding: utf-8 -*-
+
+# Copyright: (c) 2021, Andrew Pantuso (@ajpantuso) <ajpantuso@gmail.com>
+# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
+
+from __future__ import absolute_import, division, print_function
+__metaclass__ = type
+
+from unicodedata import normalize
+
+from ansible.errors import AnsibleFilterError, AnsibleFilterTypeError
+from ansible.module_utils.six import text_type
+
+
+def unicode_normalize(data, form='NFC'):
+    """Applies normalization to 'unicode' strings.
+
+    Args:
+        data: A unicode string piped into the Jinja filter
+        form: One of ('NFC', 'NFD', 'NFKC', 'NFKD').
+              See https://docs.python.org/3/library/unicodedata.html#unicodedata.normalize for more information.
+
+    Returns:
+        A normalized unicode string of the specified 'form'.
+    """
+
+    if not isinstance(data, text_type):
+        raise AnsibleFilterTypeError("%s is not a valid input type" % type(data))
+
+    if form not in ('NFC', 'NFD', 'NFKC', 'NFKD'):
+        raise AnsibleFilterError("%s is not a valid form" % form)
+
+    return normalize(form, data)
+
+
+class FilterModule(object):
+    def filters(self):
+        return {
+            'unicode_normalize': unicode_normalize,
+        }