Refactor the Django GPG app API views

Convert the Django GPG app API view to use viewsets.

Add key-list API view test.

Signed-off-by: Roberto Rosario <Roberto.Rosario@mayan-edms.com>

mayan/apps/django_gpg/api_views.py

@@ -1,9 +1,6 @@
 from __future__ import absolute_import, unicode_literals
 
-from rest_framework import generics
-
-from mayan.apps.rest_api.filters import MayanObjectPermissionsFilter
-from mayan.apps.rest_api.permissions import MayanPermission
+from mayan.apps.rest_api.viewsets import MayanAPIModelViewSet
 
 from .models import Key
 from .permissions import (
@@ -12,30 +9,15 @@ from .permissions import (
 from .serializers import KeySerializer
 
 
-class APIKeyListView(generics.ListCreateAPIView):
-    """
-    get: Returns a list of all the keys.
-    post: Upload a new key.
-    """
-    filter_backends = (MayanObjectPermissionsFilter,)
-    mayan_object_permissions = {'GET': (permission_key_view,)}
-    mayan_view_permissions = {'POST': (permission_key_upload,)}
-    permission_classes = (MayanPermission,)
-    queryset = Key.objects.all()
-    serializer_class = KeySerializer
-
-
-class APIKeyView(generics.RetrieveDestroyAPIView):
-    """
-    delete: Delete the selected key.
-    get: Return the details of the selected key.
-    """
-    filter_backends = (MayanObjectPermissionsFilter,)
-    lookup_field = 'pk'
+class KeyAPIViewSet(MayanAPIModelViewSet):
     lookup_url_kwarg = 'key_id'
-    mayan_object_permissions = {
-        'DELETE': (permission_key_delete,),
-        'GET': (permission_key_view,),
+    object_permission_map = {
+        'destroy': permission_key_delete,
+        'list': permission_key_view,
+        'retrieve': permission_key_view,
     }
     queryset = Key.objects.all()
     serializer_class = KeySerializer
+    view_permission_map = {
+        'create': permission_key_upload
+    }