Support Django 3.0 and 3.1 support (1)

* Django 3.0 dropped django.utils.decorators.available_attrs()
  in favor of functools.WRAPPER_ASSIGNMENTS.
* Django 3.0 dropped django.utils.functional.curry()
  in favor of functools.partial() or functools.partialmethod().

https://docs.djangoproject.com/en/3.1/releases/3.0/#removed-private-python-2-compatibility-apis

Change-Id: I4ab0e720a8ffe13a08f5e607a59e39f252338b90

horizon/decorators.py

@@ -21,13 +21,12 @@ General-purpose decorators for use with Horizon.
 """
 import functools
 
-from django.utils.decorators import available_attrs
 from django.utils.translation import ugettext_lazy as _
 
 
 def _current_component(view_func, dashboard=None, panel=None):
     """Sets the currently-active dashboard and/or panel on the request."""
-    @functools.wraps(view_func, assigned=available_attrs(view_func))
+    @functools.wraps(view_func, assigned=functools.WRAPPER_ASSIGNMENTS)
     def dec(request, *args, **kwargs):
         if dashboard:
             request.horizon['dashboard'] = dashboard
@@ -46,7 +45,7 @@ def require_auth(view_func):
     """
     from horizon.exceptions import NotAuthenticated
 
-    @functools.wraps(view_func, assigned=available_attrs(view_func))
+    @functools.wraps(view_func, assigned=functools.WRAPPER_ASSIGNMENTS)
     def dec(request, *args, **kwargs):
         if request.user.is_authenticated:
             return view_func(request, *args, **kwargs)
@@ -77,7 +76,7 @@ def require_perms(view_func, required):
     current_perms = getattr(view_func, '_required_perms', set([]))
     view_func._required_perms = current_perms | set(required)
 
-    @functools.wraps(view_func, assigned=available_attrs(view_func))
+    @functools.wraps(view_func, assigned=functools.WRAPPER_ASSIGNMENTS)
     def dec(request, *args, **kwargs):
         if request.user.is_authenticated:
             if request.user.has_perms(view_func._required_perms):
@@ -103,7 +102,7 @@ def require_component_access(view_func, component):
     """
     from horizon.exceptions import NotAuthorized
 
-    @functools.wraps(view_func, assigned=available_attrs(view_func))
+    @functools.wraps(view_func, assigned=functools.WRAPPER_ASSIGNMENTS)
     def dec(request, *args, **kwargs):
         if not component.can_access({'request': request}):
             raise NotAuthorized(_("You are not authorized to access %s")

openstack_auth/views.py

@@ -11,6 +11,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 import datetime
+import functools
 import logging
 
 from django.conf import settings
@@ -22,7 +23,6 @@ from django import http as django_http
 from django.middleware import csrf
 from django import shortcuts
 from django.urls import reverse
-from django.utils import functional
 from django.utils import http
 from django.utils.translation import ugettext_lazy as _
 from django.views.decorators.cache import never_cache
@@ -116,9 +116,9 @@ def login(request):
         initial.update({'region': requested_region})
 
     if request.method == "POST":
-        form = functional.curry(forms.Login)
+        form = functools.partial(forms.Login)
     else:
-        form = functional.curry(forms.Login, initial=initial)
+        form = functools.partial(forms.Login, initial=initial)
 
     choices = settings.WEBSSO_CHOICES
     reason = get_csrf_reason(request.GET.get('csrf_failure'))

openstack_dashboard/api/rest/utils.py

@@ -17,7 +17,6 @@ import logging
 
 from django.conf import settings
 from django import http
-from django.utils import decorators
 
 from oslo_serialization import jsonutils
 
@@ -104,7 +103,7 @@ def ajax(authenticated=True, data_required=False,
     def decorator(function, authenticated=authenticated,
                   data_required=data_required):
         @functools.wraps(function,
-                         assigned=decorators.available_attrs(function))
+                         assigned=functools.WRAPPER_ASSIGNMENTS)
         def _wrapped(self, request, *args, **kw):
             if authenticated and not request.user.is_authenticated:
                 return JSONResponse('not logged in', 401)