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POSymfony2 links with CSRF token
 

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    <p>I can't found a documentation about how to generate a link with the CSRF token, like in Symfony 1.4: </p> <pre><code>link_to(__('Delete'), url_for('ntw-delete', $network), array('confirm' =&gt; 'Are you sure?', 'method' =&gt; 'delete')) </code></pre> <p><strong>UPDATED:</strong> I created a twig extension for that. Maybe it will help to someone</p> <p><code>src/UmbrellaWeb/Bundle/ExtraTwigBundle/Twig/LinkExtension.php</code></p> <pre><code>&lt;?php namespace UmbrellaWeb\Bundle\ExtraTwigBundle\Twig; use Twig_Extension; use Twig_Function_Method; use Twig_Environment; use Symfony\Component\Form\Extension\Csrf\CsrfProvider\CsrfProviderInterface; class LinkExtension extends Twig_Extension { protected $csrfProvider; public function __construct(CsrfProviderInterface $csrfProvider) { $this-&gt;csrfProvider = $csrfProvider; } public function getFunctions() { return array( 'link_to' =&gt; new Twig_Function_Method($this, 'linkToFunction', array( 'is_safe' =&gt; array('html') )) ); } /** * Build a link with anchor * * @param string $path * @param string $title * @param array $options Available options: * string 'confirm' - Text for the popup * string 'method' - HTTP Method: post, delete, put * string 'csrfIntention' - CSRF intention. If empty then no CSRF. Not used for GET requests * string 'csrfField' - CSRF field name. _token by default * bool 'escape' - escape title, TRUE by default */ public function linkToFunction($path,$title,array $options = array()) { $default = array( 'csrf_intention' =&gt; '', 'csrf_field' =&gt; '_token', 'escape' =&gt; TRUE ); $options = array_merge($default,$options); $ecape = $options['escape']; unset($options['escape']); $return = '&lt;a href="%s"%s&gt;%s&lt;/a&gt;'; $return = sprintf($return, htmlspecialchars($path), $this-&gt;_tagOptions($this-&gt;_options2javascript($options)), ($ecape)?htmlspecialchars($title):$title ); return $return; } function _options2javascript($options) { // confirm $confirm = isset($options['confirm']) ? $options['confirm'] : ''; unset($options['confirm']); // method $method = isset($options['method']) ? $options['method'] : false; unset($options['method']); // CSRF Intention $csrfIntention = isset($options['csrf_intention']) ? $options['csrf_intention'] : false; unset($options['csrf_intention']); // CSRF field name $csrfField = isset($options['csrf_field']) ? $options['csrf_field'] : false; unset($options['csrf_field']); $onclick = isset($options['onclick']) ? $options['onclick'] : ''; if ($confirm &amp;&amp; $method) { $options['onclick'] = $onclick . 'if (' . $this-&gt;_confirmJsFunction($confirm) . ') { ' . $this-&gt;_methodJsFunction($method,$csrfIntention,$csrfField) . ' };return false;'; } else if ($confirm) { if ($onclick) { $options['onclick'] = 'if (' . $this-&gt;_confirmJsFunction($confirm) . ') { return ' . $onclick . '} else return false;'; } else { $options['onclick'] = 'return ' . $this-&gt;_confirmJsFunction($confirm) . ';'; } } else if ($method) { $options['onclick'] = $onclick . $this-&gt;_methodJsFunction($method,$csrfIntention,$csrfField) . 'return false;'; } return $options; } function _confirmJsFunction($confirm) { return "confirm('".$this-&gt;_escapeJs($confirm)."')"; } /** * Escape carrier returns and single and double quotes for Javascript segments. */ function _escapeJs($javascript = '') { $javascript = preg_replace('/\r\n|\n|\r/', "\\n", $javascript); $javascript = preg_replace('/(["\'])/', '\\\\\1', $javascript); return $javascript; } function _methodJsFunction($method,$csrfIntention,$csrfField) { $function = "var f = document.createElement('form'); f.style.display = 'none'; this.parentNode.appendChild(f); f.method = 'post'; f.action = this.href;"; //put, delete HTTP methods if ('post' != strtolower($method)) { $function .= "var m = document.createElement('input'); m.setAttribute('type', 'hidden'); "; $function .= sprintf("m.setAttribute('name', '_method'); m.setAttribute('value', '%s'); f.appendChild(m);", strtolower($method)); } // CSRF protection if ($csrfIntention) { /** * @todo isCsrfEnabled() - check a global config */ if (TRUE) { $function .= "var m = document.createElement('input'); m.setAttribute('type', 'hidden'); "; $function .= sprintf("m.setAttribute('name', '%s'); m.setAttribute('value', '%s'); f.appendChild(m);", $csrfField, $this-&gt;csrfProvider-&gt;generateCsrfToken($csrfIntention)); } } $function .= "f.submit();"; return $function; } function _tagOptions(array $options = array()) { $html = ''; foreach ($options as $key =&gt; $value) { $html .= ' ' . $key . '="' . htmlspecialchars($value) . '"'; } return $html; } public function getName() { return 'umbrellaweb_link'; } } </code></pre> <p><code>services.xml</code> </p> <pre><code>&lt;container xmlns="http://symfony.com/schema/dic/services" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd"&gt; &lt;services&gt; &lt;service id="umbrellaweb.twig.link_extension" class="UmbrellaWeb\Bundle\ExtraTwigBundle\Twig\LinkExtension"&gt; &lt;tag name="twig.extension" /&gt; &lt;argument type="service" id="form.csrf_provider" /&gt; &lt;/service&gt; &lt;/services&gt; &lt;/container&gt; </code></pre> <p>Now in twig you can use:</p> <pre><code>{{ link_to(path('jk_aa_admin_delete',{'id' : admin.id}),'&lt;img src="del_icon.png"/&gt;', {'escape':false,'method':'delete','csrf_intention':'delete-admin', 'confirm':'Are you sure?'}) }} </code></pre> <p>I controller:</p> <pre><code>//check CSRF token if (FALSE === $this-&gt;get('form.csrf_provider')-&gt;isCsrfTokenValid('delete-admin', $request-&gt;get('_token'))) { throw new AccessDeniedHttpException('Invalid CSRF token.'); } </code></pre>
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