Ask user to connect to Wikidata account

app.py

@@ -410,6 +410,7 @@ def item_page(item_id):
                            catalog_detail=catalog_detail,
                            labels=find_more_props,
                            entity=item.entity,
+                           username=get_username(),
                            label=label,
                            image=image,
                            other=other,

templates/item.html

@@ -84,6 +84,14 @@
       </div>
       </div>
 
+      {% if not username %}
+      <div class="alert alert-info mt-4" role="alert">
+        This tool must be connected with Wikidata to work.
+      </div>
+        <p><a href="{{ url_for('start_oauth') }}" class="btn btn-primary btn-lg">Connect with Wikidata</a>
+      {% endif %}
+
+      {% if username %}
       <form method="POST" action="{{ url_for('save', item_id=item_id) }}">
       {% raw %}
       <div id="app" class="mt-2">
@@ -129,6 +137,7 @@
       </div>
       {% endraw %}
       </form>
+      {% endif %}
     </div>
     <div class="flex-shrink-1 vh-100">
       <img src="{{ image.thumburl }}" />