app: Add backup and restore menu items to toolbar menu

Closes: #2316.

Tests:

- Go to to power app. There is no menu.

- Go to firewall app. There is a menu item but no backup and restore items present.

- Go to bepasty app. There are backup and restore menu items in menu. Clicking
backup items takes us to create backup page with only Bepasty app selected.

Signed-off-by: Sunil Mohan Adapa <sunil@medhas.org>
[jvalleroy: Fix CSS classes for new menu items]
Signed-off-by: James Valleroy <jvalleroy@mailbox.org>
Reviewed-by: James Valleroy <jvalleroy@mailbox.org>

plinth/templates/toolbar.html

@@ -21,7 +21,7 @@
         </a>
       {% endif %}
 
-      {% if has_diagnostics or show_uninstall %}
+      {% if has_diagnostics or show_uninstall or has_backup_restore %}
         <!-- Single button -->
         <div class="btn-group button-secondary">
           <button type="button" class="btn btn-default dropdown-toggle"
@@ -33,6 +33,18 @@
             {% if has_diagnostics %}
               {% include "diagnostics_button.html" with app_id=app_id enabled=is_enabled %}
             {% endif %}
+            {% if has_backup_restore %}
+              <a class="dropdown-item backup-item"
+                 href="{% url 'backups:create' app_id=app_id %}"
+                 title="{% trans "Backup" %}">
+                {% trans "Backup" %}
+              </a>
+              <a class="dropdown-item restore-item"
+                 href="{% url 'backups:index' %}"
+                 title="{% trans "Restore" %}">
+                {% trans "Restore" %}
+              </a>
+            {% endif %}
             {% if show_uninstall %}
               <a class="dropdown-item uninstall-item"
                  href="{% url 'uninstall' app_id=app_id %}"

plinth/views.py

@@ -272,6 +272,12 @@ class AppView(FormView):
         from plinth.modules.firewall.components import Firewall
         context['firewall'] = self.app.get_components_of_type(Firewall)
 
+        from plinth.modules.backups.components import BackupRestore
+        context['has_backup_restore'] = any([
+            component.has_data
+            for component in self.app.get_components_of_type(BackupRestore)
+        ])
+
         return context