rendersnappy.php

<?php

    /** 
     * This function allows you to make any view downloadable via pdf or jpg.
     * You must have KnpSnappyBundle installed (https://github.com/KnpLabs/KnpSnappyBundle)
     * To use it in any Action (example below) :
     * - Add _format in route
     * - Call return $this->renderSnappy($paramters) instead of return $paramters;
     */
    
    public function renderSnappy($parameters) {

        $properties = array(
            'jpg' => array('Content-Type' => 'image/jpg', 'Content-Disposition' => 'filename="image.jpg"', 'knp' => 'knp_snappy.image'),
            'pdf' => array('Content-Type' => 'application/pdf', 'Content-Disposition' => 'attachment; filename="file.pdf"', 'knp' => 'knp_snappy.pdf')
        );

        $template = $this->getRequest()->attributes->get('_template');
        $format = $template->get('format');

        if (!array_key_exists($format, $properties)) {
            return $parameters;
        }

        // If i'm here, format is jpg or pdf
        $view = $template->set('format', 'html')->getLogicalName();
        $html = $this->renderView($view, $parameters);
        $property = $properties[$format];
        return new Response(
            $this->get($property['knp'])->getOutputFromHtml($html),
            200,
            array(
                'Content-Type'          => $property['Content-Type'],
                'Content-Disposition'   => $property['Content-Disposition']
            )
        );
    }


    /**
     * Example : 
     * @Route("/{id}/sponsorship.{_format}", requirements={"id" = "\d+", "_locale" = "en|fr", "_format" = "html|pdf|jpg" }, defaults = {"_format" = "html"}, name="frontend_sponsorship_show")
     * @Template()
     */
    public function showSponsorshipAction(Photo $photo)
    {

        return $this->renderSnappy(array('photo' => $photo));
    }