Create utils.py

The patch create utils.py for methods which might be used
elsewhere in the project, with no matter on context.
Move get_base_url method from credentials.py to util.py so that
the method is reusable.

Change-Id: Ic8cb83bb8859b4fddcd57faa3e23992941d0010b

config_tempest/credentials.py

@@ -13,11 +13,11 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-import re
 import requests
-from six.moves import urllib
 from tempest.lib import auth
 
+from config_tempest import utils
+
 
 class Credentials(object):
     """Class contains all needed credentials.
@@ -65,20 +65,6 @@ class Credentials(object):
             # tool keeps them in identity section for further usage
             return self._conf.get_defaulted('identity', key)
 
-    def _get_base_url(self, endpoint):
-        """Return the base url.
-
-        :param key: endpoint
-        :type key: string
-        :returns: base_url
-        :rtype: string
-        """
-        url = urllib.parse.urlsplit(endpoint)
-        new_path = re.split(r'(^|/)+v\d+(\.\d+)?', url.path)[0]
-        url = list(url)
-        url[2] = new_path + '/'
-        return urllib.parse.urlunsplit(url)
-
     def _list_versions(self, base_url):
         resp = requests.get(base_url)
         data = resp.json()
@@ -90,7 +76,7 @@ class Credentials(object):
         :returns: identity version
         :rtype: string
         """
-        base_url = self._get_base_url(self._conf.get("identity", "uri"))
+        base_url = utils.get_base_url(self._conf.get("identity", "uri"))
         versions = self._list_versions(base_url)
         for version in versions:
             if version["status"] == "stable" and "v3" in version["id"]:
@@ -138,7 +124,7 @@ class Credentials(object):
             # We set uri and uri_v3 to /v3 here because if the endpoint on the
             # rc file don't set the /v3 it will fail with a error 404
             uri = self._conf.get_defaulted('identity', 'uri_v3')
-            uri = self._get_base_url(uri) + 'v3'
+            uri = utils.get_base_url(uri) + 'v3'
             self._conf.set('identity', 'uri_v3', uri)
             return auth.KeystoneV3AuthProvider(
                 self.tempest_creds,

config_tempest/utils.py

@@ -0,0 +1,33 @@
+# Copyright 2018 Red Hat, Inc.
+# 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.
+
+import re
+from six.moves import urllib
+
+
+def get_base_url(endpoint):
+    """Return the base url.
+
+    :param endpoint: endpoint
+    :type endpoint: string
+    :returns: base_url - without version
+    :rtype: string
+    """
+    url = urllib.parse.urlsplit(endpoint)
+    # the regex matches a version in the url path
+    url_path_without_version = re.split(r'(^|/)+v\d+(\.\d+)?', url.path)[0]
+    url = list(url)
+    url[2] = url_path_without_version + '/'
+    return urllib.parse.urlunsplit(url)