Also check implementsAction method

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

apps/provisioning_api/lib/Controller/UsersController.php

@@ -50,6 +50,7 @@ use OC\Accounts\AccountManager;
 use OC\Authentication\Token\RemoteWipe;
 use OC\HintException;
 use OC\KnownUser\KnownUserService;
+use OC\User\Backend;
 use OCA\Settings\Mailer\NewUserMailHelper;
 use OCP\Accounts\IAccountManager;
 use OCP\App\IAppManager;
@@ -568,7 +569,8 @@ class UsersController extends AUserData {
 
 		// Editing self (display, email)
 		if ($this->config->getSystemValue('allow_user_to_change_display_name', true) !== false) {
-			if ($targetUser->getBackend() instanceof ISetDisplayNameBackend) {
+			if ($targetUser->getBackend() instanceof ISetDisplayNameBackend
+				|| $targetUser->getBackend()->implementsActions(Backend::SET_DISPLAYNAME)) {
 				$permittedFields[] = IAccountManager::PROPERTY_DISPLAYNAME;
 			}
 			$permittedFields[] = IAccountManager::PROPERTY_EMAIL;
@@ -607,7 +609,8 @@ class UsersController extends AUserData {
 		if ($targetUser->getUID() === $currentLoggedInUser->getUID()) {
 			// Editing self (display, email)
 			if ($this->config->getSystemValue('allow_user_to_change_display_name', true) !== false) {
-				if ($targetUser->getBackend() instanceof ISetDisplayNameBackend) {
+				if ($targetUser->getBackend() instanceof ISetDisplayNameBackend
+					|| $targetUser->getBackend()->implementsActions(Backend::SET_DISPLAYNAME)) {
 					$permittedFields[] = 'display';
 					$permittedFields[] = IAccountManager::PROPERTY_DISPLAYNAME;
 				}
@@ -649,7 +652,8 @@ class UsersController extends AUserData {
 			if ($this->groupManager->isAdmin($currentLoggedInUser->getUID())
 			|| $subAdminManager->isUserAccessible($currentLoggedInUser, $targetUser)) {
 				// They have permissions over the user
-				if ($targetUser->getBackend() instanceof ISetDisplayNameBackend) {
+				if ($targetUser->getBackend() instanceof ISetDisplayNameBackend
+					|| $targetUser->getBackend()->implementsActions(Backend::SET_DISPLAYNAME)) {
 					$permittedFields[] = 'display';
 					$permittedFields[] = IAccountManager::PROPERTY_DISPLAYNAME;
 				}

apps/provisioning_api/tests/Controller/UsersControllerTest.php

@@ -66,7 +66,6 @@ use OCP\L10N\IFactory;
 use OCP\Mail\IEMailTemplate;
 use OCP\Security\Events\GenerateSecurePasswordEvent;
 use OCP\Security\ISecureRandom;
-use OCP\User\Backend\IGetDisplayNameBackend;
 use OCP\User\Backend\ISetDisplayNameBackend;
 use OCP\UserInterface;
 use PHPUnit\Framework\MockObject\MockObject;
@@ -1491,6 +1490,12 @@ class UsersControllerTest extends TestCase {
 			->method('getUID')
 			->willReturn('UID');
 
+		$backend = $this->createMock(UserInterface::class);
+		$targetUser
+			->expects($this->any())
+			->method('getBackend')
+			->willReturn($backend);
+
 		$this->assertEquals([], $this->api->editUser('UserToEdit', 'email', 'demo@nextcloud.com')->getData());
 	}
 
@@ -1524,6 +1529,12 @@ class UsersControllerTest extends TestCase {
 			->method('getUID')
 			->willReturn('UID');
 
+		$backend = $this->createMock(UserInterface::class);
+		$targetUser
+			->expects($this->any())
+			->method('getBackend')
+			->willReturn($backend);
+
 		$this->api->editUser('UserToEdit', 'email', 'demo.org');
 	}
 
@@ -1557,6 +1568,12 @@ class UsersControllerTest extends TestCase {
 			->with('UserToEdit')
 			->willReturn($loggedInUser);
 
+		$backend = $this->createMock(UserInterface::class);
+		$loggedInUser
+			->expects($this->any())
+			->method('getBackend')
+			->willReturn($backend);
+
 		$this->accountManager->expects($this->once())
 			->method('getUser')
 			->with($loggedInUser)
@@ -1601,6 +1618,12 @@ class UsersControllerTest extends TestCase {
 			->with('UserToEdit')
 			->willReturn($loggedInUser);
 
+		$backend = $this->createMock(UserInterface::class);
+		$loggedInUser
+			->expects($this->any())
+			->method('getBackend')
+			->willReturn($backend);
+
 		$this->accountManager->expects($this->once())
 			->method('getUser')
 			->with($loggedInUser)
@@ -1645,6 +1668,12 @@ class UsersControllerTest extends TestCase {
 			->method('getUID')
 			->willReturn('UID');
 
+		$backend = $this->createMock(UserInterface::class);
+		$targetUser
+			->expects($this->any())
+			->method('getBackend')
+			->willReturn($backend);
+
 		$this->assertEquals([], $this->api->editUser('UserToEdit', 'password', 'NewPassword')->getData());
 	}
 
@@ -1678,6 +1707,12 @@ class UsersControllerTest extends TestCase {
 			->method('getUID')
 			->willReturn('UID');
 
+		$backend = $this->createMock(UserInterface::class);
+		$targetUser
+			->expects($this->any())
+			->method('getBackend')
+			->willReturn($backend);
+
 		$this->api->editUser('UserToEdit', 'quota', 'NewQuota');
 	}
 
@@ -1710,6 +1745,12 @@ class UsersControllerTest extends TestCase {
 			->method('getUID')
 			->willReturn('UID');
 
+		$backend = $this->createMock(UserInterface::class);
+		$targetUser
+			->expects($this->any())
+			->method('getBackend')
+			->willReturn($backend);
+
 		$this->assertEquals([], $this->api->editUser('UserToEdit', 'quota', '3042824')->getData());
 	}
 
@@ -1745,6 +1786,12 @@ class UsersControllerTest extends TestCase {
 			->method('getUID')
 			->willReturn('UID');
 
+		$backend = $this->createMock(UserInterface::class);
+		$targetUser
+			->expects($this->any())
+			->method('getBackend')
+			->willReturn($backend);
+
 		$this->api->editUser('UserToEdit', 'quota', 'ABC');
 	}
 
@@ -1784,6 +1831,12 @@ class UsersControllerTest extends TestCase {
 			->method('getUID')
 			->willReturn('UID');
 
+		$backend = $this->createMock(UserInterface::class);
+		$targetUser
+			->expects($this->any())
+			->method('getBackend')
+			->willReturn($backend);
+
 		$this->assertEquals([], $this->api->editUser('UserToEdit', 'quota', '3042824')->getData());
 	}
 
@@ -1826,6 +1879,12 @@ class UsersControllerTest extends TestCase {
 			->method('getUID')
 			->willReturn('UserToEdit');
 
+		$backend = $this->createMock(UserInterface::class);
+		$targetUser
+			->expects($this->any())
+			->method('getBackend')
+			->willReturn($backend);
+
 		$this->assertEquals([], $this->api->editUser('UserToEdit', 'language', 'de')->getData());
 	}
 
@@ -1876,6 +1935,12 @@ class UsersControllerTest extends TestCase {
 			->method('getUID')
 			->willReturn('UserToEdit');
 
+		$backend = $this->createMock(UserInterface::class);
+		$targetUser
+			->expects($this->any())
+			->method('getBackend')
+			->willReturn($backend);
+
 		$this->assertEquals([], $this->api->editUser('UserToEdit', 'language', 'de')->getData());
 	}
 
@@ -1917,6 +1982,12 @@ class UsersControllerTest extends TestCase {
 			->method('getUID')
 			->willReturn('UserToEdit');
 
+		$backend = $this->createMock(UserInterface::class);
+		$targetUser
+			->expects($this->any())
+			->method('getBackend')
+			->willReturn($backend);
+
 		$this->assertEquals([], $this->api->editUser('UserToEdit', 'language', 'de')->getData());
 	}
 
@@ -1963,6 +2034,12 @@ class UsersControllerTest extends TestCase {
 			->method('getUID')
 			->willReturn('UserToEdit');
 
+		$backend = $this->createMock(UserInterface::class);
+		$targetUser
+			->expects($this->any())
+			->method('getBackend')
+			->willReturn($backend);
+
 		$this->assertEquals([], $this->api->editUser('UserToEdit', 'language', 'ru')->getData());
 	}
 
@@ -2002,6 +2079,12 @@ class UsersControllerTest extends TestCase {
 			->method('getUID')
 			->willReturn('UID');
 
+		$backend = $this->createMock(UserInterface::class);
+		$targetUser
+			->expects($this->any())
+			->method('getBackend')
+			->willReturn($backend);
+
 		$this->assertEquals([], $this->api->editUser('UserToEdit', 'quota', '3042824')->getData());
 	}
 
@@ -3737,7 +3820,7 @@ class UsersControllerTest extends TestCase {
 				IAccountManager::PROPERTY_WEBSITE,
 				IAccountManager::PROPERTY_TWITTER,
 			]],
-			[true, IGetDisplayNameBackend::class, [
+			[true, UserInterface::class, [
 				IAccountManager::PROPERTY_EMAIL,
 				IAccountManager::PROPERTY_PHONE,
 				IAccountManager::PROPERTY_ADDRESS,