Test cases for Policy V3 API-New

Adds a test script "test_policy.py" so as to test all the policy
API actions. And policy_client.py is added with all the required
methods. Implementation done in JSON and XML interfaces.

Change-Id: I1f4de6f0d9b8bfd58da3fd14819f3173a3f5adba
Implements: blueprint keystone-v3-policy-api-test
diff --git a/tempest/services/identity/v3/xml/policy_client.py b/tempest/services/identity/v3/xml/policy_client.py
new file mode 100644
index 0000000..c3f6d99
--- /dev/null
+++ b/tempest/services/identity/v3/xml/policy_client.py
@@ -0,0 +1,97 @@
+# vim: tabstop=4 shiftwidth=4 softtabstop=4
+
+# Copyright 2013 OpenStack Foundation
+# All Rights Reserved.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+from urlparse import urlparse
+
+import httplib2
+from lxml import etree
+
+from tempest.common.rest_client import RestClientXML
+from tempest.services.compute.xml.common import Document
+from tempest.services.compute.xml.common import Element
+from tempest.services.compute.xml.common import xml_to_json
+
+XMLNS = "http://docs.openstack.org/identity/api/v3"
+
+
+class PolicyClientXML(RestClientXML):
+
+    def __init__(self, config, username, password, auth_url, tenant_name=None):
+        super(PolicyClientXML, self).__init__(config, username, password,
+                                              auth_url, tenant_name)
+        self.service = self.config.identity.catalog_type
+        self.endpoint_url = 'adminURL'
+
+    def _parse_array(self, node):
+        array = []
+        for child in node.getchildren():
+            tag_list = child.tag.split('}', 1)
+            if tag_list[1] == "policy":
+                array.append(xml_to_json(child))
+        return array
+
+    def _parse_body(self, body):
+        json = xml_to_json(body)
+        return json
+
+    def request(self, method, url, headers=None, body=None, wait=None):
+        """Overriding the existing HTTP request in super class RestClient."""
+        dscv = self.config.identity.disable_ssl_certificate_validation
+        self.http_obj = httplib2.Http(disable_ssl_certificate_validation=dscv)
+        self._set_auth()
+        self.base_url = self.base_url.replace(urlparse(self.base_url).path,
+                                              "/v3")
+        return super(PolicyClientXML, self).request(method, url,
+                                                    headers=headers,
+                                                    body=body)
+
+    def create_policy(self, blob, type):
+        """Creates a Policy."""
+        create_policy = Element("policy", xmlns=XMLNS, blob=blob, type=type)
+        resp, body = self.post('policies', str(Document(create_policy)),
+                               self.headers)
+        body = self._parse_body(etree.fromstring(body))
+        return resp, body
+
+    def list_policies(self):
+        """Lists the policies."""
+        resp, body = self.get('policies', self.headers)
+        body = self._parse_array(etree.fromstring(body))
+        return resp, body
+
+    def get_policy(self, policy_id):
+        """Lists out the given policy."""
+        url = 'policies/%s' % policy_id
+        resp, body = self.get(url, self.headers)
+        body = self._parse_body(etree.fromstring(body))
+        return resp, body
+
+    def update_policy(self, policy_id, **kwargs):
+        """Updates a policy."""
+        resp, body = self.get_policy(policy_id)
+        type = kwargs.get('type')
+        update_policy = Element("policy", xmlns=XMLNS, type=type)
+        url = 'policies/%s' % policy_id
+        resp, body = self.patch(url, str(Document(update_policy)),
+                                self.headers)
+        body = self._parse_body(etree.fromstring(body))
+        return resp, body
+
+    def delete_policy(self, policy_id):
+        """Deletes the policy."""
+        url = "policies/%s" % policy_id
+        return self.delete(url)