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<?php
abstract class CaptchaStore {
/**
* Store the correct answer for a given captcha
* @param $index String
* @param $info String the captcha result
*/
public abstract function store( $index, $info );
/**
* Retrieve the answer for a given captcha
* @param $index String
* @return String
*/
public abstract function retrieve( $index );
/**
* Delete a result once the captcha has been used, so it cannot be reused
* @param $index
*/
public abstract function clear( $index );
/**
* Whether this type of CaptchaStore needs cookies
* @return Bool
*/
public abstract function cookiesNeeded();
/**
* The singleton instance
* @var CaptchaStore
*/
private static $instance;
/**
* Get somewhere to store captcha data that will persist between requests
*
* @throws MWException
* @return CaptchaStore
*/
public final static function get() {
if( !self::$instance instanceof self ){
global $wgCaptchaStorageClass;
if( in_array( 'CaptchaStore', class_parents( $wgCaptchaStorageClass ) ) ) {
self::$instance = new $wgCaptchaStorageClass;
} else {
throw new MWException( "Invalid CaptchaStore class $wgCaptchaStorageClass" );
}
}
return self::$instance;
}
/**
* Protected constructor: no creating instances except through the factory method above
*/
protected function __construct(){}
}
class CaptchaSessionStore extends CaptchaStore {
function store( $index, $info ) {
$_SESSION['captcha' . $info['index']] = $info;
}
function retrieve( $index ) {
if ( isset( $_SESSION['captcha' . $index] ) ) {
return $_SESSION['captcha' . $index];
} else {
return false;
}
}
function clear( $index ) {
unset( $_SESSION['captcha' . $index] );
}
function cookiesNeeded() {
return true;
}
}
class CaptchaCacheStore extends CaptchaStore {
function store( $index, $info ) {
global $wgMemc, $wgCaptchaSessionExpiration;
$wgMemc->set( wfMemcKey( 'captcha', $index ), $info,
$wgCaptchaSessionExpiration );
}
function retrieve( $index ) {
global $wgMemc;
$info = $wgMemc->get( wfMemcKey( 'captcha', $index ) );
if ( $info ) {
return $info;
} else {
return false;
}
}
function clear( $index ) {
global $wgMemc;
$wgMemc->delete( wfMemcKey( 'captcha', $index ) );
}
function cookiesNeeded() {
return false;
}
}
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