Symfony Twig Sandboxing with ArrayLoader - symfony

Question

My purpose is to sandbox a generated html.
$loader = new \Twig\Loader\ArrayLoader([
'test1.html.twig' => $this->getMessageObject()->getBody()
]);
$twig = new \Twig\Environment($loader);
$output = "{% sandbox %}{% include ("'.$twig->getLoader()->getSourceContext('test1.html.twig')->getPath().'") %} {% endsandbox %}"
I'm not able to get any path results from getPath() method. It's empty string.

Answer 1

To sandbox a twig template without using a template file can be done with using chainloader as follows:
Creating a Sandbox Policy:
$tags = ['if'];
$filters = ['filter1', 'filter2'];
$methods = [
'Customer' => ['getCustomer'],
'Person' => ['getPerson']
];
$properties = [];
$functions = ['max'];
$policy = new \Twig\Sandbox\SecurityPolicy($tags, $filters, $methods, $properties, $functions);
$sandbox = new \Twig\Extension\SandboxExtension($policy);
To Sandbox a Twig Template without Creating A Twig File:
$loader1 = new \Twig\Loader\ArrayLoader([
'test1.html.twig' => "{% if 1==1 %} Tag Test {%endif%} test content here"
]);
$loader2 = new \Twig\Loader\ArrayLoader([
'sandbox.html.twig' => '{% sandbox %}{% include "test1.html.twig" %} {% endsandbox %}'
]);
$loader = new \Twig\Loader\ChainLoader([$loader1, $loader2]);
$twig = new \Twig\Environment($loader);
$twig->addExtension($sandbox);
$renderedOutput = $twig->render('sandbox.html.twig');