1 <?php
  2 /**
  3  * Provides an {@link FormField} which allows form to validate for non-bot submissions
  4  * by giving them a challenge to decrypt an image.
  5  *
  6  * @module phpcaptcha
  7  */
  8 class PhpCaptchaField extends SpamProtectorField {
  9 
 10     /**
 11      * Use this singelton to applay you custon configured PhpCaptcha class.
 12      * If this will be left unset the fields constructor will initialise
 13      * it with a defaul PhpCaptcha class.
 14      *
 15      * @var PhpCaptcha
 16      */
 17     public static $prototype;
 18 
 19     public function __construct($name = "PhpCaptchaField", $title = "Captcha",
 20         $value = null, $form = null, $rightTitle = null) {
 21         parent::__construct($name, $title, $value, $form, $rightTitle);
 22         require_once Director::baseFolder().'/phpcaptcha/code/php-captcha.inc.php';
 23 
 24         if(!PhpCaptchaField::$prototype) {
 25             $f = array(
 26                 Director::baseFolder().'/phpcaptcha/fonts/VeraIt.ttf',
 27                 Director::baseFolder().'/phpcaptcha/fonts/VeraMono.ttf',
 28                 Director::baseFolder().'/phpcaptcha/fonts/VeraSe.ttf',
 29                 Director::baseFolder().'/phpcaptcha/fonts/VeraSeBd.ttf'
 30             );
 31             $p = new PhpCaptcha($f, 140, 40);
 32             $p->SetBackgroundImages(
 33                 Director::baseFolder()."/phpcaptcha/images/bg1.jpeg");
 34             $p->UseColour(true);
 35             $p->SetCharSet('0-9');
 36             PhpCaptchaField::$prototype = $p;
 37         }
 38     }
 39     
 40     public function Field() {
 41         $attributes = array(
 42             'type' => 'text',
 43             'class' => 'text' . ($this->extraClass() ? $this->extraClass() : ''),
 44             'id' => $this->id(),
 45             'name' => $this->Name(),
 46             'value' => $this->Value(),
 47             'tabindex' => $this->getTabIndex(),
 48             'maxlength' => ($this->maxLength) ? $this->maxLength : null,
 49             'size' => ($this->maxLength) ? min( $this->maxLength, 30 ) : null
 50         );
 51 
 52         if($this->disabled) $attributes['disabled'] = 'disabled';
 53 
 54 //TODO: использовать шаблон, сделать кнопку "обновить изображение"
 55         return '<img src="'.Director::baseURL().
 56             'PhpCaptchaField/genimage?t=' . time() . '" alt="" /><br />'.
 57             $this->createTag('input', $attributes);
 58     }
 59 
 60     /**
 61      * Needed do satisfy the request handler
 62      */
 63     public function setSession($session) {
 64         
 65     }
 66     
 67     /**
 68      * Validate the PhpCaptcha code
 69      *
 70      * @param Validator $validator
 71      * @return boolean
 72      */
 73     public function validate($validator) {
 74 
 75         if(!PhpCaptcha::Validate(@$_REQUEST[$this->name])) {
 76             if ($validator) {
 77             $validator->validationError(
 78                 $this->name,
 79                 _t(
 80                     'PhpCaptchaField.WRONG',
 81                     "The text you entered doesn't match the captcha. Please try again"
 82                 ),
 83                 "validation",
 84                 false
 85             );
 86             }
 87             return false;
 88         }
 89         else {
 90             return true;
 91         }
 92     }
 93 
 94     /**
 95      * This action is requested by the field to generate the captcha image
 96      * and stream it straight to the reqests response
 97      */
 98     public function genimage() {
 99         HTTP::set_cache_age(0);
100         HTTP::add_cache_headers();
101         header('Last-Modified: ' . HTTP::gmt_date(time()));
102         PhpCaptchaField::$prototype->Create();
103     }
104 }