Do not dispatch postSetPassword when setPassword fails

Also Improve error message when setPassword fails

Signed-off-by: Louis Chemineau <louis@chmn.me>

apps/settings/lib/Controller/ChangePasswordController.php

@@ -109,7 +109,10 @@ class ChangePasswordController extends Controller {
 		try {
 			if ($newpassword === null || $user->setPassword($newpassword) === false) {
 				return new JSONResponse([
-					'status' => 'error'
+					'status' => 'error',
+					'data' => [
+						'message' => $this->l->t('Unable to change personal password'),
+					],
 				]);
 			}
 			// password policy app throws exception

lib/private/User/User.php

@@ -320,13 +320,17 @@ class User implements IUser {
 		}
 		if ($this->backend->implementsActions(Backend::SET_PASSWORD)) {
 			$result = $this->backend->setPassword($this->uid, $password);
-			$this->legacyDispatcher->dispatch(IUser::class . '::postSetPassword', new GenericEvent($this, [
-				'password' => $password,
-				'recoveryPassword' => $recoveryPassword,
-			]));
-			if ($this->emitter) {
-				$this->emitter->emit('\OC\User', 'postSetPassword', [$this, $password, $recoveryPassword]);
+
+			if ($result !== false) {
+				$this->legacyDispatcher->dispatch(IUser::class . '::postSetPassword', new GenericEvent($this, [
+					'password' => $password,
+					'recoveryPassword' => $recoveryPassword,
+				]));
+				if ($this->emitter) {
+					$this->emitter->emit('\OC\User', 'postSetPassword', [$this, $password, $recoveryPassword]);
+				}
 			}
+
 			return !($result === false);
 		} else {
 			return false;

tests/Core/Controller/ChangePasswordControllerTest.php

@@ -138,6 +138,9 @@ class ChangePasswordControllerTest extends \Test\TestCase {
 
 		$expects = [
 			'status' => 'error',
+			'data' => [
+				'message' => 'Unable to change personal password',
+			],
 		];
 
 		$res = $this->controller->changePersonalPassword('old');
@@ -163,6 +166,9 @@ class ChangePasswordControllerTest extends \Test\TestCase {
 
 		$expects = new JSONResponse([
 			'status' => 'error',
+			'data' => [
+				'message' => 'Unable to change personal password',
+			],
 		]);
 
 		$actual = $this->controller->changePersonalPassword('old', 'new');