Closes #12062: Avoid caching invalid RSS feed content

netbox/extras/dashboard/widgets.py

@@ -193,14 +193,16 @@ class RSSFeedWidget(DashboardWidget):
         return f'dashboard_rss_{url_checksum}'
 
     def get_feed(self):
-        # Fetch RSS content from cache
+        # Fetch RSS content from cache if available
         if feed_content := cache.get(self.cache_key):
             feed = feedparser.FeedParserDict(feed_content)
         else:
             feed = feedparser.parse(self.config['feed_url'])
+            if not feed.bozo:
                 # Cap number of entries
                 max_entries = self.config.get('max_entries')
                 feed['entries'] = feed['entries'][:max_entries]
+                # Cache the feed content
                 cache.set(self.cache_key, dict(feed), self.config.get('cache_timeout'))
 
         return feed

netbox/templates/extras/dashboard/widgets/rssfeed.html

@@ -1,4 +1,5 @@
-<div class="list-group list-group-flush">
+{% if not feed.bozo %}
+  <div class="list-group list-group-flush">
     {% for entry in feed.entries %}
       <div class="list-group-item px-1">
         <h6><a href="{{ entry.link }}">{{ entry.title }}</a></h6>
@@ -9,5 +10,13 @@
     {% empty %}
       <div class="list-group-item text-muted">No content found</div>
     {% endfor %}
-</div>
-
+  </div>
+{% else %}
+  {# There was an error retrieving/parsing the feed #}
+  <span class="text-danger">
+    <i class="mdi mdi-alert"></i> There was a problem fetching the RSS feed:
+  </span>
+  <pre class="m-2">
+Response status: {{ feed.status }}
+Error: {{ feed.bozo_exception|escape }}</pre>
+{% endif %}