fix atom link in XML Version API

This patch fixes tag names where the tag name has ':'
for links templates.
Some examples are
'{http://www.w3.org/2005/Atom}link'
should be
['{http://www.w3.org/2005/Atom}link']

and

'test1:test2'
should be
['test1', 'test2']

Closes-Bug: #1311243
Change-Id: I6e7c068e41eb6b069c24ef9d6c46b726ea722074

cinder/api/xmlutil.py

@@ -14,6 +14,7 @@
 #    under the License.
 
 import os.path
+import re
 
 from lxml import etree
 
@@ -29,6 +30,8 @@ XMLNS_VOLUME_V1 = 'http://docs.openstack.org/volume/api/v1'
 XMLNS_VOLUME_V2 = ('http://docs.openstack.org/api/openstack-volume/2.0/'
                    'content')
 
+_split_pattern = re.compile(r'([^:{]*{[^}]*}[^:]*|[^:]+)')
+
 
 def validate_schema(xml, schema_name):
     if isinstance(xml, str):
@@ -356,6 +359,10 @@ class TemplateElement(object):
                 pass
         return tmpattrib
 
+    @staticmethod
+    def _splitTagName(name):
+        return _split_pattern.findall(name)
+
     def _render(self, parent, datum, patches, nsmap):
         """Internal rendering.
 
@@ -382,7 +389,7 @@ class TemplateElement(object):
         else:
             tmpattrib = {}
 
-        tagnameList = tagname.split(':')
+        tagnameList = self._splitTagName(tagname)
         insertIndex = 0
 
         #If parent is not none and has same tagname

cinder/tests/api/test_xmlutil.py

@@ -472,6 +472,18 @@ class TemplateTest(test.TestCase):
         self.assertEqual(len(siblings), 1)
         self.assertEqual(siblings[0], elem)
 
+    def test__splitTagName(self):
+        test_cases = [
+            ('a', ['a']),
+            ('a:b', ['a', 'b']),
+            ('{http://test.com}a:b', ['{http://test.com}a', 'b']),
+            ('a:b{http://test.com}:c', ['a', 'b{http://test.com}', 'c']),
+        ]
+
+        for test_case, expected in test_cases:
+            result = xmlutil.TemplateElement._splitTagName(test_case)
+            self.assertEqual(expected, result)
+
     def test__nsmap(self):
         # Set up a basic template
         elem = xmlutil.TemplateElement('test')