Adds CrawlerDetect to prevent expiring links for Bots

app/app.php

@@ -61,6 +61,13 @@
     'locale' => $app['i18n_service']->getLocale($config['locale']),
 ));
 
+// Add Crawler Detect
+$app['crawlerDetect'] = $app->share(
+    function() {
+        return new Jaybizzle\CrawlerDetect\CrawlerDetect;
+    }
+);
+
 // Register the yaml translations
 $app['translator'] = $app->share($app->extend('translator', function(Silex\Translator $translator, $app) {
     $translator->addLoader('yaml', new Symfony\Component\Translation\Loader\YamlFileLoader());

app/locales/de.yml

@@ -34,3 +34,5 @@ view_password.view: Passwort Anzeigen
 view_password.expires: Dieser Eintrag erlischt in
 view_password.delete: Löschen
 view_password.expired: Dieser Eintrag ist erloschen!
+
+view_crawler.info: Ein Kennwort wurde mit Ihnen geteilt, als Sicherheitsmaßnahme ist die Vorschau deaktiviert.

app/locales/en.yml

@@ -38,3 +38,5 @@ view_password.view: View Password
 view_password.expires: This listing will be removed in
 view_password.delete: Delete
 view_password.expired: The requested record has expired!
+
+view_crawler.info: A password has been shared with you, as a security measure the preview is disabled.

composer.json

@@ -15,7 +15,8 @@
         "codegyre/robo": "^0.5.4",
         "patchwork/jsqueeze": "^2.0",
         "natxet/CssMin": "^3.0",
-        "phpseclib/phpseclib": "^2.0"
+        "phpseclib/phpseclib": "^2.0",
+        "jaybizzle/crawler-detect": "1.*"
     },
     "autoload": {
         "psr-0": {

src/App/Controller/DefaultController.php

@@ -105,6 +105,12 @@ public function viewLinkAction($hash)
      */
     public function viewPasswordAction($hash)
     {
+        // check if the page is loaded by a crawler, e.g. a Slack of Whatsapp preview
+        $crawlerDetect = $this->app['crawlerDetect'];
+        if ($crawlerDetect->isCrawler()) {
+            return $this->twig->render('view_crawler.twig');
+        }
+
         $credentials = $this->getCredentials($hash);
 
         return $this->twig->render('view_password.twig', array(

src/App/views/view_crawler.twig

@@ -0,0 +1,10 @@
+{% extends 'layout.twig' %}
+{% block title %}{{ 'app.name'|trans }} - {{ 'view_password.view'|trans }}{% endblock %}
+
+{% block content %}
+  <div class="row">
+    <div class="col-sm-12 col-md-6 col-md-offset-3 page-container">
+        <div id="crawlerDetect"><span class="glyphicon glyphicon-eye-open"></span> {{ 'view_crawler.info'|trans }} </div>
+    </div>
+  </div>
+{% endblock %}

vendor/.gitignore

@@ -21,3 +21,4 @@ silex
 symfony
 twig
 webmozart
+jaybizzle