indicate articles that are targets of in-product links

kitsune/wiki/jinja2/wiki/document.html

@@ -57,6 +57,13 @@
     {{ search_box(settings, id='support-search-sidebar', params=search_params) }}
   </div>
 
+  {% if document.is_inproduct_target %}
+  <div class="sidebar-subheading">
+    <img height=32 width=32 src="{{ webpack_static('sumo/img/fa-bullseye.svg') }}" alt="{{ _('Target') }}" />
+    {{ _("In-Product Link") }}
+  </div>
+  {% endif %}
+
   {{ aaq_widget(request, "document") }}
 
   {% if fallback_reason == 'no_translation' %}

kitsune/wiki/models.py

@@ -19,6 +19,7 @@
 from pyquery import PyQuery
 
 from kitsune.gallery.models import Image
+from kitsune.inproduct.models import Redirect
 from kitsune.products.models import Product, Topic
 from kitsune.sumo.apps import ProgrammingError
 from kitsune.sumo.i18n import split_into_language_and_path
@@ -779,6 +780,17 @@ def is_unrestricted_for(self, user, use_cache=True):
 
         return user.id in self.unrestricted_for_user_ids
 
+    @cached_property
+    def is_inproduct_target(self):
+        if self.parent:
+            return Redirect.objects.filter(
+                (Q(locale__in=("", self.locale)) & Q(target__contains=f"kb/{self.parent.slug}"))
+                | (Q(locale=self.locale) & Q(target__contains=f"kb/{self.slug}"))
+            ).exists()
+        return Redirect.objects.filter(
+            locale__in=("", self.locale), target__contains=f"kb/{self.slug}"
+        ).exists()
+
 
 class AbstractRevision(models.Model):
     # **%(class)s** is being used because it will allow  a unique reverse name for the field