Add preLoginValidation hook

Signed-off-by: Sandro Lutz <sandro.lutz@temparus.ch>

core/Controller/LoginController.php

@@ -216,6 +216,9 @@ class LoginController extends Controller {
 		}
 
 		$originalUser = $user;
+
+        $this->userManager->emit('\OC\User', 'preLoginValidation', array($user, $password));
+
 		// TODO: Add all the insane error handling
 		/* @var $loginResult IUser */
 		$loginResult = $this->userManager->checkPassword($user, $password);

lib/private/Server.php

@@ -295,6 +295,9 @@ class Server extends ServerContainer implements IServerContainer {
 				/** @var $user \OC\User\User */
 				\OC_Hook::emit('OC_User', 'post_setPassword', array('run' => true, 'uid' => $user->getUID(), 'password' => $password, 'recoveryPassword' => $recoveryPassword));
 			});
+            $userSession->listen('\OC\User', 'preLoginValidation', function ($uid, $password) {
+                \OC_Hook::emit('OC_User', 'pre_loginValidation', array('run' => true, 'uid' => $uid, 'password' => $password));
+            });
 			$userSession->listen('\OC\User', 'preLogin', function ($uid, $password) {
 				\OC_Hook::emit('OC_User', 'pre_login', array('run' => true, 'uid' => $uid, 'password' => $password));
 			});