Add split_pem filter (#549)

* Add split_pem filter.

* Fix documentation.

* Python 2.7.

* Improve error message matching.

Co-authored-by: Brian Scholer <1260690+briantist@users.noreply.github.com>

Co-authored-by: Brian Scholer <1260690+briantist@users.noreply.github.com>

plugins/filter/split_pem.py

@@ -0,0 +1,64 @@
+# -*- coding: utf-8 -*-
+
+# Copyright (c) 2022, Felix Fontein <felix@fontein.de>
+# GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+from __future__ import absolute_import, division, print_function
+__metaclass__ = type
+
+DOCUMENTATION = '''
+name: split_pem
+short_description: Split PEM file contents into multiple objects
+version_added: 2.10.0
+author:
+    - Felix Fontein (@felixfontein)
+description:
+    - Split PEM file contents into multiple PEM objects. Comments or invalid parts are ignored.
+options:
+    _input:
+        description:
+            - The PEM contents to split.
+        type: string
+        required: true
+'''
+
+EXAMPLES = '''
+- name: Print all CA certificates
+  ansible.builtin.debug:
+    msg: '{{ item }}'
+  loop: >-
+    {{ lookup('ansible.builtin.file', '/path/to/ca-bundle.pem') | community.crypto.split_pem }}
+'''
+
+RETURN = '''
+_value:
+    description:
+        - A list of PEM file contents.
+    type: list
+    elements: string
+'''
+
+from ansible.errors import AnsibleFilterError
+from ansible.module_utils.six import string_types
+from ansible.module_utils.common.text.converters import to_text
+
+from ansible_collections.community.crypto.plugins.module_utils.crypto.pem import split_pem_list
+
+
+def split_pem_filter(data):
+    '''Split PEM file.'''
+    if not isinstance(data, string_types):
+        raise AnsibleFilterError('The community.crypto.split_pem input must be a text type, not %s' % type(data))
+
+    data = to_text(data)
+    return split_pem_list(data)
+
+
+class FilterModule(object):
+    '''Ansible jinja2 filters'''
+
+    def filters(self):
+        return {
+            'split_pem': split_pem_filter,
+        }