ActivityLogTable: filter by host if given

In future we'll have better filtering possibilities, for now this scans all
rows with a matching service name in the table

fixes #1613

library/Director/Web/Controller/ObjectController.php

@@ -224,10 +224,13 @@ abstract class ObjectController extends ActionController
 
         $db = $this->db();
         $type = $this->getType();
-        (new ActivityLogTable($db))
+        $table = (new ActivityLogTable($db))
             ->setLastDeployedId($db->getLastDeploymentActivityLogId())
-            ->filterObject('icinga_' . $type, $name)
-            ->renderTo($this);
+            ->filterObject('icinga_' . $type, $name);
+        if ($host = $this->params->get('host')) {
+            $table->filterHost($host);
+        }
+        $table->renderTo($this);
     }
 
     /**

library/Director/Web/Table/ActivityLogTable.php

@@ -113,6 +113,19 @@ class ActivityLogTable extends ZfQueryBasedTable
         return $this;
     }
 
+    public function filterHost($name)
+    {
+        $db = $this->db();
+        $filter = '%"host":' . json_encode($name) . '%';
+        $this->filters[] = ['('
+            . $db->quoteInto('l.old_properties LIKE ?', $filter)
+            . ' OR '
+            . $db->quoteInto('l.new_properties LIKE ?', $filter)
+            . ')', null];
+
+        return $this;
+    }
+
     public function getColumns()
     {
         return [