Current File : /home/tjamichg/cursos.tjamich.gob.mx/vendor/symfony/twig-bridge/Extension/WebLinkExtension.php
<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Bridge\Twig\Extension;
use Fig\Link\GenericLinkProvider;
use Fig\Link\Link;
use Symfony\Component\HttpFoundation\RequestStack;
use Twig\Extension\AbstractExtension;
use Twig\TwigFunction;
/**
* Twig extension for the Symfony WebLink component.
*
* @author Kévin Dunglas <dunglas@gmail.com>
*/
class WebLinkExtension extends AbstractExtension
{
private $requestStack;
public function __construct(RequestStack $requestStack)
{
$this->requestStack = $requestStack;
}
/**
* {@inheritdoc}
*/
public function getFunctions()
{
return array(
new TwigFunction('link', array($this, 'link')),
new TwigFunction('preload', array($this, 'preload')),
new TwigFunction('dns_prefetch', array($this, 'dnsPrefetch')),
new TwigFunction('preconnect', array($this, 'preconnect')),
new TwigFunction('prefetch', array($this, 'prefetch')),
new TwigFunction('prerender', array($this, 'prerender')),
);
}
/**
* Adds a "Link" HTTP header.
*
* @param string $uri The relation URI
* @param string $rel The relation type (e.g. "preload", "prefetch", "prerender" or "dns-prefetch")
* @param array $attributes The attributes of this link (e.g. "array('as' => true)", "array('pr' => 0.5)")
*
* @return string The relation URI
*/
public function link($uri, $rel, array $attributes = array())
{
if (!$request = $this->requestStack->getMasterRequest()) {
return $uri;
}
$link = new Link($rel, $uri);
foreach ($attributes as $key => $value) {
$link = $link->withAttribute($key, $value);
}
$linkProvider = $request->attributes->get('_links', new GenericLinkProvider());
$request->attributes->set('_links', $linkProvider->withLink($link));
return $uri;
}
/**
* Preloads a resource.
*
* @param string $uri A public path
* @param array $attributes The attributes of this link (e.g. "array('as' => true)", "array('crossorigin' => 'use-credentials')")
*
* @return string The path of the asset
*/
public function preload($uri, array $attributes = array())
{
return $this->link($uri, 'preload', $attributes);
}
/**
* Resolves a resource origin as early as possible.
*
* @param string $uri A public path
* @param array $attributes The attributes of this link (e.g. "array('as' => true)", "array('pr' => 0.5)")
*
* @return string The path of the asset
*/
public function dnsPrefetch($uri, array $attributes = array())
{
return $this->link($uri, 'dns-prefetch', $attributes);
}
/**
* Initiates a early connection to a resource (DNS resolution, TCP handshake, TLS negotiation).
*
* @param string $uri A public path
* @param array $attributes The attributes of this link (e.g. "array('as' => true)", "array('pr' => 0.5)")
*
* @return string The path of the asset
*/
public function preconnect($uri, array $attributes = array())
{
return $this->link($uri, 'preconnect', $attributes);
}
/**
* Indicates to the client that it should prefetch this resource.
*
* @param string $uri A public path
* @param array $attributes The attributes of this link (e.g. "array('as' => true)", "array('pr' => 0.5)")
*
* @return string The path of the asset
*/
public function prefetch($uri, array $attributes = array())
{
return $this->link($uri, 'prefetch', $attributes);
}
/**
* Indicates to the client that it should prerender this resource .
*
* @param string $uri A public path
* @param array $attributes The attributes of this link (e.g. "array('as' => true)", "array('pr' => 0.5)")
*
* @return string The path of the asset
*/
public function prerender($uri, array $attributes = array())
{
return $this->link($uri, 'prerender', $attributes);
}
}
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