From 8eda6617618e0a1f650afc4e6766e799b4e62b82 Mon Sep 17 00:00:00 2001
From: Robin Appelman <icewind@owncloud.com>
Date: Thu, 22 Jan 2015 14:13:17 +0100
Subject: [PATCH] Throw an exception when login is canceled by an app

---
 lib/base.php                        | 25 +++++++++++++++----------
 lib/private/user/loginexception.php | 12 ++++++++++++
 lib/private/user/session.php        |  7 ++++++-
 3 files changed, 33 insertions(+), 11 deletions(-)
 create mode 100644 lib/private/user/loginexception.php

diff --git a/lib/base.php b/lib/base.php
index 34fa178ebf7..6ac38ac86d5 100644
--- a/lib/base.php
+++ b/lib/base.php
@@ -844,19 +844,24 @@ class OC {
 	protected static function handleLogin() {
 		OC_App::loadApps(array('prelogin'));
 		$error = array();
+		$messages = [];
 
-		// auth possible via apache module?
-		if (OC::tryApacheAuth()) {
-			$error[] = 'apacheauthfailed';
-		} // remember was checked after last login
-		elseif (OC::tryRememberLogin()) {
-			$error[] = 'invalidcookie';
-		} // logon via web form
-		elseif (OC::tryFormLogin()) {
-			$error[] = 'invalidpassword';
+		try {
+			// auth possible via apache module?
+			if (OC::tryApacheAuth()) {
+				$error[] = 'apacheauthfailed';
+			} // remember was checked after last login
+			elseif (OC::tryRememberLogin()) {
+				$error[] = 'invalidcookie';
+			} // logon via web form
+			elseif (OC::tryFormLogin()) {
+				$error[] = 'invalidpassword';
+			}
+		} catch (\OC\User\LoginException $e) {
+			$messages[] = $e->getMessage();
 		}
 
-		OC_Util::displayLoginPage(array_unique($error));
+		OC_Util::displayLoginPage(array_unique($error), $messages);
 	}
 
 	/**
diff --git a/lib/private/user/loginexception.php b/lib/private/user/loginexception.php
new file mode 100644
index 00000000000..571f66bd945
--- /dev/null
+++ b/lib/private/user/loginexception.php
@@ -0,0 +1,12 @@
+<?php
+/**
+ * Copyright (c) 2014 Robin Appelman <icewind@owncloud.com>
+ * This file is licensed under the Affero General Public License version 3 or
+ * later.
+ * See the COPYING-README file.
+ */
+
+namespace OC\User;
+
+class LoginException extends \Exception {
+}
diff --git a/lib/private/user/session.php b/lib/private/user/session.php
index cad6e225b03..ffb26776f97 100644
--- a/lib/private/user/session.php
+++ b/lib/private/user/session.php
@@ -189,6 +189,7 @@ class Session implements IUserSession, Emitter {
 	 * @param string $uid
 	 * @param string $password
 	 * @return boolean|null
+	 * @throws LoginException
 	 */
 	public function login($uid, $password) {
 		$this->manager->emit('\OC\User', 'preLogin', array($uid, $password));
@@ -199,7 +200,11 @@ class Session implements IUserSession, Emitter {
 					$this->setUser($user);
 					$this->setLoginName($uid);
 					$this->manager->emit('\OC\User', 'postLogin', array($user, $password));
-					return $this->isLoggedIn();
+					if ($this->isLoggedIn()) {
+						return true;
+					} else {
+						throw new LoginException('Login canceled by app');
+					}
 				} else {
 					return false;
 				}
-- 
2.39.5