New Module: Keycloak Realm Info (#3998)

* feat(plugins/keycloak): add get_realm_info_by_id as util function

* feat(plugins/keycloak): add keycloak_realm_info module

* chore: add maintainer

* feat(plugins/keycloak): remove supports_check_mode

* feat(plugins/keycloak): add supports_check_mode back

* Update plugins/modules/identity/keycloak/keycloak_realm_info.py

Co-authored-by: Felix Fontein <felix@fontein.de>

* Update plugins/modules/identity/keycloak/keycloak_realm_info.py

Co-authored-by: Felix Fontein <felix@fontein.de>

* docs(plugins/keycloak): cleanup docs

* feat(plugins/keycloak): add unit test

* Update plugins/modules/identity/keycloak/keycloak_realm_info.py

Co-authored-by: Felix Fontein <felix@fontein.de>

* Update plugins/modules/identity/keycloak/keycloak_realm_info.py

Co-authored-by: Felix Fontein <felix@fontein.de>

* feat(plugins/keycloak): remove end_state

* docs(plugins/keycloak): complete sentences

* docs(plugins/keycloak): use dict for return type

Co-authored-by: Felix Fontein <felix@fontein.de>

tests/unit/plugins/modules/identity/keycloak/test_keycloak_realm_info.py

@@ -0,0 +1,121 @@
+# -*- coding: utf-8 -*-
+
+# Copyright: (c) 2021, Ansible Project
+# 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 contextlib import contextmanager
+
+from ansible_collections.community.general.tests.unit.compat import unittest
+from ansible_collections.community.general.tests.unit.compat.mock import call, patch
+from ansible_collections.community.general.tests.unit.plugins.modules.utils import AnsibleExitJson, ModuleTestCase, set_module_args
+
+from ansible_collections.community.general.plugins.modules.identity.keycloak import keycloak_realm_info
+
+from itertools import count
+
+from ansible.module_utils.six import StringIO
+
+
+@contextmanager
+def patch_keycloak_api(get_realm_info_by_id):
+    """Mock context manager for patching the methods in PwPolicyIPAClient that contact the IPA server
+
+    Patches the `login` and `_post_json` methods
+
+    Keyword arguments are passed to the mock object that patches `_post_json`
+
+    No arguments are passed to the mock object that patches `login` because no tests require it
+
+    Example::
+
+        with patch_ipa(return_value={}) as (mock_login, mock_post):
+            ...
+    """
+
+    obj = keycloak_realm_info.KeycloakAPI
+    with patch.object(obj, 'get_realm_info_by_id', side_effect=get_realm_info_by_id) as mock_get_realm_info_by_id:
+        yield mock_get_realm_info_by_id
+
+
+def get_response(object_with_future_response, method, get_id_call_count):
+    if callable(object_with_future_response):
+        return object_with_future_response()
+    if isinstance(object_with_future_response, dict):
+        return get_response(
+            object_with_future_response[method], method, get_id_call_count)
+    if isinstance(object_with_future_response, list):
+        call_number = next(get_id_call_count)
+        return get_response(
+            object_with_future_response[call_number], method, get_id_call_count)
+    return object_with_future_response
+
+
+def build_mocked_request(get_id_user_count, response_dict):
+    def _mocked_requests(*args, **kwargs):
+        url = args[0]
+        method = kwargs['method']
+        future_response = response_dict.get(url, None)
+        return get_response(future_response, method, get_id_user_count)
+    return _mocked_requests
+
+
+def create_wrapper(text_as_string):
+    """Allow to mock many times a call to one address.
+    Without this function, the StringIO is empty for the second call.
+    """
+    def _create_wrapper():
+        return StringIO(text_as_string)
+    return _create_wrapper
+
+
+def mock_good_connection():
+    token_response = {
+        'http://keycloak.url/auth/realms/master/protocol/openid-connect/token': create_wrapper('{"access_token": "alongtoken"}'), }
+    return patch(
+        'ansible_collections.community.general.plugins.module_utils.identity.keycloak.keycloak.open_url',
+        side_effect=build_mocked_request(count(), token_response),
+        autospec=True
+    )
+
+
+class TestKeycloakRealmRole(ModuleTestCase):
+    def setUp(self):
+        super(TestKeycloakRealmRole, self).setUp()
+        self.module = keycloak_realm_info
+
+    def test_get_public_info(self):
+        """Get realm public info"""
+
+        module_args = {
+            'auth_keycloak_url': 'http://keycloak.url/auth',
+            'realm': 'my-realm',
+        }
+        return_value = [
+            None,
+            {
+                "realm": "my-realm",
+                "public_key": "MIIBIjANBgkqhkiG9w0BAQEF...",
+                "token-service": "https://auth.mock.com/auth/realms/my-realm/protocol/openid-connect",
+                "account-service": "https://auth.mock.com/auth/realms/my-realm/account",
+                "tokens-not-before": 0,
+            }
+        ]
+
+        set_module_args(module_args)
+
+        # Run the module
+
+        with mock_good_connection():
+            with patch_keycloak_api(get_realm_info_by_id=return_value) \
+                    as (mock_get_realm_info_by_id):
+                with self.assertRaises(AnsibleExitJson) as exec_info:
+                    self.module.main()
+
+        self.assertEqual(len(mock_get_realm_info_by_id.mock_calls), 1)
+
+
+if __name__ == '__main__':
+    unittest.main()