Allow to read the old email on the hook as well

Signed-off-by: Joas Schilling <coding@schilljs.com>

lib/private/Server.php

@@ -343,9 +343,9 @@ class Server extends ServerContainer implements IServerContainer {
 			$userSession->listen('\OC\User', 'logout', function () {
 				\OC_Hook::emit('OC_User', 'logout', array());
 			});
-			$userSession->listen('\OC\User', 'changeUser', function ($user, $feature, $value) {
+			$userSession->listen('\OC\User', 'changeUser', function ($user, $feature, $value, $oldValue) {
 				/** @var $user \OC\User\User */
-				\OC_Hook::emit('OC_User', 'changeUser', array('run' => true, 'user' => $user, 'feature' => $feature, 'value' => $value));
+				\OC_Hook::emit('OC_User', 'changeUser', array('run' => true, 'user' => $user, 'feature' => $feature, 'value' => $value, 'old_value' => $oldValue));
 			});
 			return $userSession;
 		});

lib/private/User/User.php

@@ -158,12 +158,13 @@ class User implements IUser {
 	 * @since 9.0.0
 	 */
 	public function setEMailAddress($mailAddress) {
+		$oldMailAddress = $this->getEMailAddress();
 		if($mailAddress === '') {
 			$this->config->deleteUserValue($this->uid, 'settings', 'email');
 		} else {
 			$this->config->setUserValue($this->uid, 'settings', 'email', $mailAddress);
 		}
-		$this->triggerChange('eMailAddress', $mailAddress);
+		$this->triggerChange('eMailAddress', $mailAddress, $oldMailAddress);
 	}
 
 	/**
@@ -435,9 +436,9 @@ class User implements IUser {
 		return $url;
 	}
 
-	public function triggerChange($feature, $value = null) {
+	public function triggerChange($feature, $value = null, $oldValue = null) {
 		if ($this->emitter) {
-			$this->emitter->emit('\OC\User', 'changeUser', array($this, $feature, $value));
+			$this->emitter->emit('\OC\User', 'changeUser', array($this, $feature, $value, $oldValue));
 		}
 	}
 }