KNP Snappy wkhtmltopdf configuration for Platform.sh

.adding-wkhtmltopdf-to-symfony-on-platform-with-knpsnappy-bundle

# This file means nothing. It's just here to give the Gist a name I can understand.
# This configuration requires the KNP Snappy Bundle [https://github.com/KnpLabs/KnpSnappyBundle]

.platform.app.yml

#.platform.app.yml
...
dependencies:
    ...
    ruby:
        "wkhtmltopdf-binary": "> 0.0"

config.yml

#config.yml
...
knp_snappy:
    pdf:
        enabled:    true
        binary:     wkhtmltopdf
        options:    []
    image:
        enabled:    true
        binary:     wkhtmltoimage
        options:    []

# In order for this to work locally, you'll need to install WKHTMLTOPDF (I used Brew: http://brewformulas.org/Wkhtmltopdf) and add an alias to these binaries in your .bashrc or .zshrc file:
# alias wkhtmltopdf='/usr/local/bin/wkhtmltopdf'

ReportController.php

 <?php

namespace MyBundle\Controller;

use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;

class ReportController extends Controller
{
    public function reportAction(Request $request, $id) {
        $html = $this->renderView('::report.html.twig', array());
        ...
        $snappy = $this->get('knp_snappy.pdf');
        $snappy->setOption('user-style-sheet',$request->server->get('DOCUMENT_ROOT').'/css/app.css');
        $snappy->setOption('allow', array('/images','/css'));
        return new Response(
            $snappy->getOutputFromHtml($html, array('cookie' => array($session->getName() => $session->getId()))),
            200,
            array(
              'Content-Type'          => 'application/pdf',
              'Content-Disposition'   => 'attachment; filename="report.pdf"'
            )
        );
    }
}