Updated parsing of catalog to handle bad format

Don't assume that the service catalog is well-formed, added code
to safely parsing the catalog.

Parsing of region from service catalog has been fixed as well.
'region' has been deprecated in the Keystone V3 catalog in favor of
'region_id'. Fix how region is extracted by checking 'region_id' then
fallback to 'region'.

Change-Id: I7b649a8b90e20caa2d04fdd3f79b5b1ac775237c
Closes-Bug: #1424825

openstack_auth/backend.py

@@ -215,11 +215,19 @@ class KeystoneBackend(object):
         #                      when supported by Keystone.
         role_perms = set(["openstack.roles.%s" % role['name'].lower()
                           for role in user.roles])
-        service_perms = set(["openstack.services.%s" % service['type'].lower()
-                             for service in user.service_catalog
-                             if user.services_region in
-                             [endpoint.get('region', None) for endpoint
-                              in service.get('endpoints', [])]])
+
+        services = []
+        for service in user.service_catalog:
+            try:
+                service_type = service['type']
+            except KeyError:
+                continue
+            service_regions = [utils.get_endpoint_region(endpoint) for endpoint
+                               in service.get('endpoints', [])]
+            if user.services_region in service_regions:
+                services.append(service_type.lower())
+        service_perms = set(["openstack.services.%s" % service
+                             for service in services])
         return role_perms | service_perms
 
     def has_perm(self, user, perm, obj=None):

openstack_auth/user.py

@@ -113,10 +113,7 @@ class Token(object):
         else:
             self.roles = auth_ref.get('roles', [])
 
-        if utils.get_keystone_version() < 3:
-            self.serviceCatalog = auth_ref.get('serviceCatalog', [])
-        else:
-            self.serviceCatalog = auth_ref.get('catalog', [])
+        self.serviceCatalog = auth_ref.service_catalog.get_data()
 
 
 class User(models.AnonymousUser):
@@ -331,11 +328,13 @@ class User(models.AnonymousUser):
         regions = []
         if self.service_catalog:
             for service in self.service_catalog:
-                if service['type'] == 'identity':
+                service_type = service.get('type')
+                if service_type is None or service_type == 'identity':
                     continue
-                for endpoint in service['endpoints']:
-                    if endpoint['region'] not in regions:
-                        regions.append(endpoint['region'])
+                for endpoint in service.get('endpoints', []):
+                    region = utils.get_endpoint_region(endpoint)
+                    if region not in regions:
+                        regions.append(region)
         return regions
 
     def save(*args, **kwargs):

openstack_auth/utils.py

@@ -260,20 +260,24 @@ def default_services_region(service_catalog, request=None):
     Extracted from the service catalog.
     """
     if service_catalog:
-        available_regions = [endpoint['region'] for service
+        available_regions = [get_endpoint_region(endpoint) for service
                              in service_catalog for endpoint
-                             in service['endpoints']
-                             if service['type'] != 'identity']
+                             in service.get('endpoints', [])
+                             if (service.get('type') is not None
+                                 and service.get('type') != 'identity')]
         if not available_regions:
             # this is very likely an incomplete keystone setup
             LOG.warning('No regions could be found excluding identity.')
-            available_regions = [endpoint['region'] for service
+            available_regions = [get_endpoint_region(endpoint) for service
                                  in service_catalog for endpoint
-                                 in service['endpoints']]
-        if not available_regions:
-            # this is a critical problem and it's not clear how this occurs
-            LOG.error('No regions can be found in the service catalog.')
-            return None
+                                 in service.get('endpoints', [])]
+
+            if not available_regions:
+                # if there are no region setup for any service endpoint,
+                # this is a critical problem and it's not clear how this occurs
+                LOG.error('No regions can be found in the service catalog.')
+                return None
+
         selected_region = None
         if request:
             selected_region = request.COOKIES.get('services_region',
@@ -297,6 +301,18 @@ def set_response_cookie(response, cookie_name, cookie_value):
     response.set_cookie(cookie_name, cookie_value, expires=expire_date)
 
 
+def get_endpoint_region(endpoint):
+    """Common function for getting the region from endpoint.
+
+    In Keystone V3, region has been deprecated in favor of
+    region_id.
+
+    This method provides a way to get region that works for both
+    Keystone V2 and V3.
+    """
+    return endpoint.get('region_id') or endpoint.get('region')
+
+
 if django.VERSION < (1, 7):
     try:
         from importlib import import_module