puppetboard: Adding Catalog Viewer

This makes use of the available catalog endpoints in pypuppetdb and PuppetDB
and displays to administrators the last compiled catalog for a node,
if the variable ENABLE_CATALOG is True (defaults to False)

puppetboard/app.py

@@ -403,3 +403,13 @@ def metric(metric):
         'metric.html',
         name=name,
         metric=sorted(metric.items()))
+
+@app.route('/catalog/<node_name>')
+def catalog_node(node_name):
+    """Fetches from PuppetDB the compiled catalog of a given node."""
+    if app.config['ENABLE_CATALOG']:
+        catalog = puppetdb.catalog(node=node_name)
+        return render_template('catalog.html', catalog=catalog)
+    else:
+        log.warn('Access to catalog interface disabled by administrator')
+        abort(403)