Refactor "ownership" concepts in templates

- Template code was very messy
- Makes it a lot "simpler"
- Adds convenience functions to the StockLocation model
- Adds pre-calculated data to the template
- Display ownership information on the stocklocation page

InvenTree/stock/models.py

@@ -63,6 +63,43 @@ class StockLocation(InvenTreeTree):
                               help_text=_('Select Owner'),
                               related_name='stock_locations')
 
+    def get_location_owner(self):
+        """
+        Get the closest "owner" for this location.
+
+        Start at this location, and traverse "up" the location tree until we find an owner
+        """
+
+        for loc in self.get_ancestors(include_self=True, ascending=True):
+            if loc.owner is not None:
+                return loc.owner
+
+        return None        
+    
+    def check_ownership(self, user):
+        """
+        Check if the user "owns" (is one of the owners of) the location.
+        """
+
+        # Superuser accounts automatically "own" everything
+        if user.is_superuser:
+            return True
+
+        ownership_enabled = common.models.InvenTreeSetting.get_setting('STOCK_OWNERSHIP_CONTROL')
+
+        if not ownership_enabled:
+            # Location ownership function is not enabled, so return True
+            return True
+
+        owner = self.get_location_owner()
+
+        if owner is None:
+            # No owner set, for this location or any location above
+            # So, no ownership checks to perform!
+            return True
+    
+        return user in owner.get_related_owners(include_group=True)
+
     def get_absolute_url(self):
         return reverse('stock-location-detail', kwargs={'pk': self.id})
 

InvenTree/stock/templates/stock/location.html

@@ -20,7 +20,6 @@
 {% endblock %}
 
 {% block actions %}
-{% setting_object 'STOCK_OWNERSHIP_CONTROL' as owner_control %}
 
 <!-- Admin view -->
 {% if location and user.is_staff and roles.stock_location.change %}
@@ -40,7 +39,7 @@
     </ul>
 </div>
 <!-- Check permissions and owner -->
-{% if owner_control.value == "False" or owner_control.value == "True" and user in owners or user.is_superuser %}
+{% if user_owns_location %}
 {% if roles.stock.change %}
 <div class='btn-group' role='group'>
     <button id='stock-actions' title='{% trans "Stock actions" %}' class='btn btn-outline-secondary dropdown-toggle' type='button' data-bs-toggle='dropdown'>
@@ -76,13 +75,11 @@
 {% endif %}
 {% endif %}
 {% endif %}
-{% if owner_control.value == "False" or owner_control.value == "True" and user in owners or user.is_superuser or not location %}
-{% if roles.stock_location.add %}
+{% if user_owns_location and roles.stock_location.add %}
 <button class='btn btn-success' id='location-create' type='button' title='{% trans "Create new stock location" %}'>
     <span class='fas fa-plus-circle'></span> {% trans "New Location" %}
 </button>
 {% endif %}
-{% endif %}
 {% endblock %}
 
 {% block details_left %}
@@ -108,23 +105,23 @@
         <td><em>{% trans "Top level stock location" %}</em></td>
     </tr>
     {% endif %}
+    {% if ownership_enabled and location_owner %}
+    <tr>
+        <td><span class='fas fa-users'></span></td>
+        <td>{% trans "Location Owner" %}</td>
+        <td>
+            {{ location_owner }}
+            {% if not user_owns_location %}
+            <span class='badge rounded-pill bg-warning badge-right' title='{% trans "You are not in the list of owners of this location. This stock location cannot be edited." %}'>
+                {% trans "Read Only" %}
+            </span>
+            {% endif %}
+        </td>
+    </tr>
+    {% endif %}
 </table>
 {% endblock details_left %}
 
-{% block details_below %}
-{% setting_object 'STOCK_OWNERSHIP_CONTROL' as owner_control %}
-{% if owner_control.value == "True" %}
-    {% authorized_owners location.owner as owners %}
-
-    {% if location and not user in owners and not user.is_superuser %}
-    <div class='alert alert-block alert-info'>
-        {% trans "You are not in the list of owners of this location. This stock location cannot be edited." %}<br>
-    </div>
-    {% endif %}
-{% endif %}
-
-{% endblock details_below %}
-
 {% block details_right %}
 {% if location %}
 <table class='table table-striped table-condensed'>

InvenTree/stock/views.py

@@ -63,6 +63,11 @@ class StockIndex(InvenTreeRoleMixin, ListView):
         context['loc_count'] = StockLocation.objects.count()
         context['stock_count'] = StockItem.objects.count()
 
+        # No 'ownership' checks are necessary for the top-level StockLocation view
+        context['user_owns_location'] = True
+        context['location_owner'] = None
+        context['ownership_enabled'] = common.models.InvenTreeSetting.get_setting('STOCK_OWNERSHIP_CONTROL')
+
         return context
 
 
@@ -76,6 +81,16 @@ class StockLocationDetail(InvenTreeRoleMixin, DetailView):
     queryset = StockLocation.objects.all()
     model = StockLocation
 
+    def get_context_data(self, **kwargs):
+        
+        context = super().get_context_data(**kwargs)
+
+        context['ownership_enabled'] = common.models.InvenTreeSetting.get_setting('STOCK_OWNERSHIP_CONTROL')
+        context['location_owner'] = context['location'].get_location_owner()
+        context['user_owns_location'] = context['location'].check_ownership(self.request.user)
+
+        return context
+
 
 class StockItemDetail(InvenTreeRoleMixin, DetailView):
     """