Added functionality to generate image files for older browsers.

DependencyInjection/Configuration.php

@@ -22,6 +22,9 @@ class Configuration implements ConfigurationInterface
                 ->scalarNode('length')->defaultValue(5)->end()
                 ->scalarNode('width')->defaultValue(120)->end()
                 ->scalarNode('height')->defaultValue(40)->end()
+                ->scalarNode('as_file')->defaultValue(false)->end()
+                ->scalarNode('image_folder')->defaultValue('captcha')->end()
+                ->scalarNode('web_path')->defaultValue('%kernel.root_dir%/../web')->end()
             ->end()
         ;
         return $treeBuilder;

DependencyInjection/GregwarCaptchaExtension.php

@@ -22,6 +22,9 @@ class GregwarCaptchaExtension extends Extension
         $container->setParameter('gregwar_captcha.length', $config['length']);
         $container->setParameter('gregwar_captcha.height', $config['height']);
         $container->setParameter('gregwar_captcha.width', $config['width']);
+        $container->setParameter('gregwar_captcha.as_file', $config['as_file']);
+        $container->setParameter('gregwar_captcha.image_folder', $config['image_folder']);
+        $container->setParameter('gregwar_captcha.web_path', $config['web_path']);
 
         $resources = $container->getParameter('twig.form.resources');
         $container->setParameter('twig.form.resources',array_merge(array('GregwarCaptchaBundle::captcha.html.twig'), $resources));

Generator/CaptchaGenerator.php

@@ -2,16 +2,22 @@
 
 namespace Gregwar\CaptchaBundle\Generator;
 
+use Symfony\Component\Finder\Finder;
+
 /**
  * Generates a CAPTCHA image
  */
 class CaptchaGenerator {
 
+    public $imageFolder;
+    public $webPath;
     public $value;
 
-    public function __construct($value)
+    public function __construct($value, $imageFolder, $webPath)
     {
         $this->value = $value;
+        $this->imageFolder = $imageFolder;
+        $this->webPath = $webPath;
     }
 
     public function getCode($width = 120, $height = 40)
@@ -19,10 +25,45 @@ class CaptchaGenerator {
         return 'data:image/jpeg;base64,'.base64_encode($this->generate($width, $height));
     }
 
+    /**
+     * Creates a captcha image with provided dimensions
+     * and randomly executes a garbage collection
+     *
+     * @param int $width
+     * @param int $height
+     * @return string Web path to the created image
+     */
+    public function getFile($width = 120, $height = 40)
+    {
+        if (rand(0, 10) == 5) {
+            $this->garbageCollection();
+        }
+
+        return $this->generate($width, $height, true);
+    }
+
+    /**
+     * Deletes all images in the configured folder
+     * that are older than 10 minutes
+     *
+     * @return void
+     */
+    public function garbageCollection()
+    {
+        $finder = new Finder();
+        $finder->in($this->webPath . '/' . $this->imageFolder)
+               ->date('since 10 minutes ago');
+
+        foreach($finder->files() as $file)
+        {
+            @unlink($file->getPathname());
+        }
+    }
+
     /**
      * Generate the image
      */
-    public function generate($width, $height)
+    public function generate($width, $height, $createFile = false)
     {
         $i = imagecreatetruecolor($width,$height);
 
@@ -87,9 +128,16 @@ class CaptchaGenerator {
             }
 
         // Renders it
-        ob_start();
+        if (!$createFile) {
-        imagejpeg($out, null, 15);
+            ob_start();
-        return ob_get_clean();
+            imagejpeg($out, null, 15);
+            return ob_get_clean();
+        } else {
+            $filename = md5(uniqid()) . '.jpg';
+            $filepath = $this->webPath . '/' . $this->imageFolder . '/' . $filename;
+            imagejpeg($out, $filepath, 15);
+            return '/' . $this->imageFolder . '/' . $filename;
+        }
     }
 
     protected function getCol($image, $x, $y)

README.md

@@ -100,6 +100,9 @@ You can define the following type option :
 * **width**: the width of the captcha image (default=120)
 * **height**: the height of the captcha image (default=40)
 * **length**: the length of the captcha (number of chars, default 5)
+* **as_file**: if set to true an image file will be created instead of embedding to please IE6/7 (default=false)
+* **image_folder**: name of folder for captcha images relative to public web folder in case **as_file** ist set to true (default="captcha")
+* **web_path**: absolute path to public web folder (default="%kernel.root_dir%/../web")
 
 Example :
 
@@ -109,7 +112,7 @@ Example :
     $builder->add('captcha', 'captcha', array(
         'width' => 200,
         'height' => 50,
-        'length' => 6
+        'length' => 6,
     ));
 ```
 
@@ -137,6 +140,11 @@ The default rendering is:
 {% endblock %}
 ```
 
+Image creation
+==============
+If you choose to use real images instead of embedded the widget will execute a garbage collection
+randomly and delete images that are older than 10 minutes.
+
 License
 =======
 This bundle is under the MIT license. See the complete license in the bundle:

Resources/config/services.yml

@@ -3,6 +3,6 @@ services:
     # captcha type
     captcha.type:
         class: Gregwar\CaptchaBundle\Type\CaptchaType
-        arguments: [@session, %gregwar_captcha.width%, %gregwar_captcha.height%, %gregwar_captcha.length%]
+        arguments: [ "@session", %gregwar_captcha.width%, %gregwar_captcha.height%, %gregwar_captcha.length%, %gregwar_captcha.as_file%, %gregwar_captcha.image_folder%, %gregwar_captcha.web_path% ]
         tags:
             - { name: form.type, alias: captcha }

Type/CaptchaType.php

@@ -39,6 +39,25 @@ class CaptchaType extends AbstractType
      */
     protected $length;
 
+    /**
+     * Generate image or data
+     * @var boolean
+     */
+    protected $asFile;
+
+    /**
+     * Folder to save captcha images in,
+     * relative to public web folder
+     * @var string
+     */
+    protected $imageFolder;
+
+    /**
+     * Public web folder
+     * @var string
+     */
+    protected $webPath;
+
     /**
      * The session
      * @var Symfony\Component\HttpFoundation\Session
@@ -48,12 +67,15 @@ class CaptchaType extends AbstractType
     private $key = 'captcha';
 
 
-    public function __construct(Session $session, $width, $height, $length)
+    public function __construct(Session $session, $width, $height, $length, $asFile, $imageFolder, $webPath)
     {
         $this->session = $session;
         $this->width = $width;
         $this->height = $height;
         $this->length = $length;
+        $this->asFile = $asFile;
+        $this->imageFolder = $imageFolder;
+        $this->webPath = $webPath;
     }
 
     public function buildForm(FormBuilder $builder, array $options)
@@ -65,9 +87,13 @@ class CaptchaType extends AbstractType
 
     public function buildView(FormView $view, FormInterface $form)
     {
-        $generator = new CaptchaGenerator($this->generateCaptchaValue());
+        $generator = new CaptchaGenerator($this->generateCaptchaValue(), $this->imageFolder, $this->webPath);
 
-        $view->set('captcha_code', $generator->getCode($this->width, $this->height));
+        if ($this->asFile) {
+            $view->set('captcha_code', $generator->getFile($this->width, $this->height));
+        } else {
+            $view->set('captcha_code', $generator->getCode($this->width, $this->height));
+        }
         $view->set('captcha_width', $this->width);
         $view->set('captcha_height', $this->height);
     }
@@ -83,11 +109,15 @@ class CaptchaType extends AbstractType
         if (isset($options['length'])) {
             $this->length = $options['length'];
         }
+        if (isset($options['as_file'])) {
+            $this->asFile = $options['as_file'];
+        }
 
         return array(
             'width' => $this->width,
             'height' => $this->height,
             'length' => $this->length,
+            'as_file' => $this->asFile,
             'property_path' => false,
         );
     }