.
*/
/**
* The foundation for the pluggable CAPTCHA support.
* Each implementation should be instantiated once and added to cformsII
* by using the filter cforms2_add_captcha with the method add_instance.
*/
abstract class cforms2_captcha {
/**
* @return string A unique identifier for this CAPTCHA type.
*/
abstract public function get_id();
/**
* @return string The human readable name for this CAPTCHA type that appears in the GUI.
*/
abstract public function get_name();
/**
* Returns an associative array consisting of
* "html" => HTML including at least an input field with this class's name as name
* "hint" => the information needed for check_response method to evaluate the response
*
* @param string $input_classes The class names for the input field
* @param string $input_title The title for the input field
* @return string HTML representing the captcha
*/
abstract public function get_request($input_id, $input_classes, $input_title);
/**
* Checks the answer given by the user for correctness.
*
* @param string $post The possibly filtered HTTP POST data from submitting a form.
* @return bool true, if the answer was correct.
*/
abstract public function check_response($post);
/**
* Renders the HTML required for the settings modal dialog.
*/
abstract public function render_settings();
/**
* Adds this instance with the classname as a key to the array.
*
* @param array $captchas
* @return array The original array with a pair added.
*/
public final function add_instance(array $captchas) {
$captchas[$this->get_id()] = $this;
return $captchas;
}
/**
* @return bool true, if all users have to resolve the CAPTCHA, including the authenticated users.
*/
public function check_authn_users() {
return false;
}
}
/**
* Replaces the old Q&A feature.
*/
final class cforms2_question_and_answer extends cforms2_captcha {
private $cforms_settings;
public function __construct() {
$this->cforms_settings = get_option('cforms_settings');
}
public function get_id() {
return get_class($this);
}
public function get_name() {
return __('Visitor verification (Q&A)', 'cforms2');
}
public function check_authn_users() {
return $this->cforms_settings['global']['cforms_captcha_def']['foqa'] == '1';
}
public function check_response($post) {
$hint = $post[$this->get_id() . '/hint'];
$answer = $post[$this->get_id()];
$q = $this->question_and_answer(intval($hint));
return strcasecmp($answer, $q[2]) === 0;
}
public function get_request($input_id, $input_classes, $input_title) {
$q = $this->question_and_answer();
$label = stripslashes(htmlspecialchars($q[1]));
$req = ''
. ''
. '';
return $req;
}
/**
* Returns the nth question & answer pair.
*
* @param int $n The nth pair. If negative, $n is random.
* @return array array(n, qestion, answer)
*/
private function question_and_answer($n = -1) {
$qall = explode( "\r\n", $this->cforms_settings['global']['cforms_sec_qa'] );
if ($n < 0)
$n = mt_rand( 0, count($qall)-1 );
$q = explode( '=', $qall[$n]);
array_unshift($q, $n);
return $q;
}
public function render_settings() {
require ('include/textfield.php');
}
}
add_filter('cforms2_add_captcha', array(new cforms2_question_and_answer(), 'add_instance'));