Update permission app to the new class based permissions

apps/permissions/api.py

@@ -1,69 +1 @@
-try:
-    from psycopg2 import OperationalError
-except ImportError:
-    class OperationalError(Exception):
-        pass
 
-from django.core.exceptions import ImproperlyConfigured
-from django.db import transaction
-from django.db.utils import DatabaseError
-from django.shortcuts import get_object_or_404
-from django.utils.translation import ugettext
-from django.core.exceptions import PermissionDenied
-from django.utils.translation import ugettext_lazy as _
-
-from permissions import PERMISSION_ROLE_VIEW, PERMISSION_ROLE_EDIT, \
-    PERMISSION_ROLE_CREATE, PERMISSION_ROLE_DELETE, \
-    PERMISSION_PERMISSION_GRANT, PERMISSION_PERMISSION_REVOKE
-
-from permissions.models import Permission
-from permissions.runtime import namespace_titles, permission_titles
-
-
-def set_namespace_title(namespace, title):
-    namespace_titles.setdefault(namespace, title)
-
-
-@transaction.commit_manually
-def register_permission(permission):
-    try:
-        permission_obj, created = Permission.objects.get_or_create(
-            namespace=permission['namespace'], name=permission['name'])
-        permission_obj.label = unicode(permission['label'])
-        permission_obj.save()
-        permission_titles['%s.%s' % (permission['namespace'], permission['name'])] = permission['label']
-    except DatabaseError:
-        transaction.rollback()
-        # Special case for ./manage.py syncdb
-    except (OperationalError, ImproperlyConfigured):
-        transaction.rollback()
-        # Special for DjangoZoom, which executes collectstatic media
-        # doing syncdb and creating the database tables
-    else:
-        transaction.commit()
-
-
-def check_permissions(requester, permission_list):
-    for permission_item in permission_list:
-        permission = get_object_or_404(Permission,
-            namespace=permission_item['namespace'], name=permission_item['name'])
-        if permission.has_permission(requester):
-            return True
-
-    raise PermissionDenied(ugettext(u'Insufficient permissions.'))
-
-
-def get_permission_label(permission):
-	return unicode(permission_titles.get('%s.%s' % (permission.namespace, permission.name), permission.label))
-	
-    
-def get_permission_namespace_label(permission):
-    return namespace_titles[permission.namespace] if permission.namespace in namespace_titles else permission.namespace
-    
-    
-register_permission(PERMISSION_ROLE_VIEW)
-register_permission(PERMISSION_ROLE_EDIT)
-register_permission(PERMISSION_ROLE_CREATE)
-register_permission(PERMISSION_ROLE_DELETE)
-register_permission(PERMISSION_PERMISSION_GRANT)
-register_permission(PERMISSION_PERMISSION_REVOKE)