1 files changed, 116 insertions, 0 deletions
diff --git a/extensions/ConfirmEdit/includes/CaptchaStore.php b/extensions/ConfirmEdit/includes/CaptchaStore.php
new file mode 100644
index 00000000..b0854df1
--- /dev/null
+++ b/extensions/ConfirmEdit/includes/CaptchaStore.php
@@ -0,0 +1,116 @@
+<?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 $instance;
+
+	/**
+	 * Get somewhere to store captcha data that will persist between requests
+	 *
+	 * @throws Exception
+	 * @return CaptchaStore
+	 */
+	public final static function get() {
+		if ( !self::$instance instanceof self ) {
+			global $wgCaptchaStorageClass;
+			if ( in_array( 'CaptchaStore', class_parents( $wgCaptchaStorageClass ) ) ) {
+				self::$instance = new $wgCaptchaStorageClass;
+			} else {
+				throw new Exception( "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 {
+
+	protected function __construct() {
+		// Make sure the session is started
+		if ( session_id() === '' ) {
+			wfSetupSession();
+		}
+	}
+
+	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;
+	}
+}