Get l10n within NewUserMailHelper to ensure it always uses the new user's language.

Some related tests had to be changed because they relied on internals, see also from the PHPUnit documentation:
"Exercise caution when using [the at] matcher as it can lead to brittle tests which are too closely tied to specific implementation details."

Signed-off-by: Zulan <git@zulan.net>

apps/provisioning_api/lib/AppInfo/Application.php

@@ -43,7 +43,7 @@ class Application extends App {
 			return new NewUserMailHelper(
 				$server->query(Defaults::class),
 				$server->getURLGenerator(),
-				$server->getL10N('settings'),
+				$server->getL10NFactory(),
 				$server->getMailer(),
 				$server->getSecureRandom(),
 				new TimeFactory(),

apps/provisioning_api/lib/Controller/UsersController.php

@@ -894,16 +894,8 @@ class UsersController extends AUserData {
 		if ($email === '' || $email === null) {
 			throw new OCSException('Email address not available', 101);
 		}
-		$username = $targetUser->getUID();
-		$lang = $this->config->getUserValue($username, 'core', 'lang', 'en');
-		if (!$this->l10nFactory->languageExists('settings', $lang)) {
-			$lang = 'en';
-		}
-
-		$l10n = $this->l10nFactory->get('settings', $lang);
 
 		try {
-			$this->newUserMailHelper->setL10N($l10n);
 			$emailTemplate = $this->newUserMailHelper->generateTemplate($targetUser, false);
 			$this->newUserMailHelper->sendMail($targetUser, $emailTemplate);
 		} catch(\Exception $e) {

apps/provisioning_api/tests/Controller/UsersControllerTest.php

@@ -3257,35 +3257,13 @@ class UsersControllerTest extends TestCase {
 			->expects($this->once())
 			->method('getEmailAddress')
 			->will($this->returnValue('abc@example.org'));
-		$this->config
-			->expects($this->at(0))
-			->method('getUserValue')
-			->with('user-id', 'core', 'lang')
-			->willReturn('es');
-		$l10n = $this->getMockBuilder(IL10N::class)
-			->disableOriginalConstructor()
-			->getMock();
-		$this->l10nFactory
-			->expects($this->at(0))
-			->method('languageExists')
-			->with('settings', 'es')
-			->willReturn(true);
-		$this->l10nFactory
-			->expects($this->at(1))
-			->method('get')
-			->with('settings', 'es')
-			->willReturn($l10n);
 		$emailTemplate = $this->createMock(IEMailTemplate::class);
 		$this->newUserMailHelper
 			->expects($this->at(0))
-			->method('setL10N')
-			->willReturn($l10n);
-		$this->newUserMailHelper
-			->expects($this->at(1))
 			->method('generateTemplate')
 			->willReturn($emailTemplate);
 		$this->newUserMailHelper
-			->expects($this->at(2))
+			->expects($this->at(1))
 			->method('sendMail')
 			->with($targetUser, $emailTemplate);
 
@@ -3327,35 +3305,16 @@ class UsersControllerTest extends TestCase {
 			->expects($this->once())
 			->method('getEmailAddress')
 			->will($this->returnValue('abc@example.org'));
-		$this->config
-			->expects($this->at(0))
-			->method('getUserValue')
-			->with('user-id', 'core', 'lang')
-			->willReturn('es');
 		$l10n = $this->getMockBuilder(IL10N::class)
 			->disableOriginalConstructor()
 			->getMock();
-		$this->l10nFactory
-			->expects($this->at(0))
-			->method('languageExists')
-			->with('settings', 'es')
-			->willReturn(false);
-		$this->l10nFactory
-			->expects($this->at(1))
-			->method('get')
-			->with('settings', 'en')
-			->willReturn($l10n);
 		$emailTemplate = $this->createMock(IEMailTemplate::class);
 		$this->newUserMailHelper
 			->expects($this->at(0))
-			->method('setL10N')
-			->willReturn($l10n);
-		$this->newUserMailHelper
-			->expects($this->at(1))
 			->method('generateTemplate')
 			->willReturn($emailTemplate);
 		$this->newUserMailHelper
-			->expects($this->at(2))
+			->expects($this->at(1))
 			->method('sendMail')
 			->with($targetUser, $emailTemplate);
 
@@ -3402,35 +3361,13 @@ class UsersControllerTest extends TestCase {
 			->expects($this->once())
 			->method('getEmailAddress')
 			->will($this->returnValue('abc@example.org'));
-		$this->config
-			->expects($this->at(0))
-			->method('getUserValue')
-			->with('user-id', 'core', 'lang')
-			->willReturn('es');
-		$l10n = $this->getMockBuilder(IL10N::class)
-			->disableOriginalConstructor()
-			->getMock();
-		$this->l10nFactory
-			->expects($this->at(0))
-			->method('languageExists')
-			->with('settings', 'es')
-			->willReturn(true);
-		$this->l10nFactory
-			->expects($this->at(1))
-			->method('get')
-			->with('settings', 'es')
-			->willReturn($l10n);
 		$emailTemplate = $this->createMock(IEMailTemplate::class);
 		$this->newUserMailHelper
 			->expects($this->at(0))
-			->method('setL10N')
-			->willReturn($l10n);
-		$this->newUserMailHelper
-			->expects($this->at(1))
 			->method('generateTemplate')
 			->willReturn($emailTemplate);
 		$this->newUserMailHelper
-			->expects($this->at(2))
+			->expects($this->at(1))
 			->method('sendMail')
 			->with($targetUser, $emailTemplate)
 			->willThrowException(new \Exception());

settings/Application.php

@@ -100,7 +100,7 @@ class Application extends App {
 			return new NewUserMailHelper(
 				$defaults,
 				$server->getURLGenerator(),
-				$server->getL10N('settings'),
+				$server->getL10NFactory(),
 				$server->getMailer(),
 				$server->getSecureRandom(),
 				new TimeFactory(),

settings/Mailer/NewUserMailHelper.php

@@ -26,6 +26,7 @@
 
 namespace OC\Settings\Mailer;
 
+use OCP\L10N\IFactory;
 use OCP\Mail\IEMailTemplate;
 use OCP\AppFramework\Utility\ITimeFactory;
 use OCP\Defaults;
@@ -42,8 +43,8 @@ class NewUserMailHelper {
 	private $themingDefaults;
 	/** @var IURLGenerator */
 	private $urlGenerator;
-	/** @var IL10N */
-	private $l10n;
+	/** @var IFactory */
+	private $l10nFactory;
 	/** @var IMailer */
 	private $mailer;
 	/** @var ISecureRandom */
@@ -60,7 +61,7 @@ class NewUserMailHelper {
 	/**
 	 * @param Defaults $themingDefaults
 	 * @param IURLGenerator $urlGenerator
-	 * @param IL10N $l10n
+	 * @param IFactory $l10nFactory
 	 * @param IMailer $mailer
 	 * @param ISecureRandom $secureRandom
 	 * @param ITimeFactory $timeFactory
@@ -70,7 +71,7 @@ class NewUserMailHelper {
 	 */
 	public function __construct(Defaults $themingDefaults,
 								IURLGenerator $urlGenerator,
-								IL10N $l10n,
+								IFactory $l10nFactory,
 								IMailer $mailer,
 								ISecureRandom $secureRandom,
 								ITimeFactory $timeFactory,
@@ -79,7 +80,7 @@ class NewUserMailHelper {
 								$fromAddress) {
 		$this->themingDefaults = $themingDefaults;
 		$this->urlGenerator = $urlGenerator;
-		$this->l10n = $l10n;
+		$this->l10nFactory = $l10nFactory;
 		$this->mailer = $mailer;
 		$this->secureRandom = $secureRandom;
 		$this->timeFactory = $timeFactory;
@@ -88,21 +89,20 @@ class NewUserMailHelper {
 		$this->fromAddress = $fromAddress;
 	}
 
-	/**
-	 * Set the IL10N object
-	 *
-	 * @param IL10N $l10n
-	 */
-	public function setL10N(IL10N $l10n) {
-		$this->l10n = $l10n;
-	}
-
 	/**
 	 * @param IUser $user
 	 * @param bool $generatePasswordResetToken
 	 * @return IEMailTemplate
 	 */
 	public function generateTemplate(IUser $user, $generatePasswordResetToken = false) {
+		$userId = $user->getUID();
+		$lang = $this->config->getUserValue($userId, 'core', 'lang', 'en');
+		if (!$this->l10nFactory->languageExists('settings', $lang)) {
+			$lang = 'en';
+		}
+
+		$l10n = $this->l10nFactory->get('settings', $lang);
+
 		if ($generatePasswordResetToken) {
 			$token = $this->secureRandom->generate(
 				21,
@@ -119,7 +119,6 @@ class NewUserMailHelper {
 			$link = $this->urlGenerator->getAbsoluteURL('/');
 		}
 		$displayName = $user->getDisplayName();
-		$userId = $user->getUID();
 
 		$emailTemplate = $this->mailer->createEMailTemplate('settings.Welcome', [
 			'link' => $link,
@@ -129,24 +128,24 @@ class NewUserMailHelper {
 			'resetTokenGenerated' => $generatePasswordResetToken,
 		]);
 
-		$emailTemplate->setSubject($this->l10n->t('Your %s account was created', [$this->themingDefaults->getName()]));
+		$emailTemplate->setSubject($l10n->t('Your %s account was created', [$this->themingDefaults->getName()]));
 		$emailTemplate->addHeader();
 		if ($displayName === $userId) {
-			$emailTemplate->addHeading($this->l10n->t('Welcome aboard'));
+			$emailTemplate->addHeading($l10n->t('Welcome aboard'));
 		} else {
-			$emailTemplate->addHeading($this->l10n->t('Welcome aboard %s', [$displayName]));
+			$emailTemplate->addHeading($l10n->t('Welcome aboard %s', [$displayName]));
 		}
-		$emailTemplate->addBodyText($this->l10n->t('Welcome to your %s account, you can add, protect, and share your data.', [$this->themingDefaults->getName()]));
-		$emailTemplate->addBodyText($this->l10n->t('Your username is: %s', [$userId]));
+		$emailTemplate->addBodyText($l10n->t('Welcome to your %s account, you can add, protect, and share your data.', [$this->themingDefaults->getName()]));
+		$emailTemplate->addBodyText($l10n->t('Your username is: %s', [$userId]));
 		if ($generatePasswordResetToken) {
-			$leftButtonText = $this->l10n->t('Set your password');
+			$leftButtonText = $l10n->t('Set your password');
 		} else {
-			$leftButtonText = $this->l10n->t('Go to %s', [$this->themingDefaults->getName()]);
+			$leftButtonText = $l10n->t('Go to %s', [$this->themingDefaults->getName()]);
 		}
 		$emailTemplate->addBodyButtonGroup(
 			$leftButtonText,
 			$link,
-			$this->l10n->t('Install Client'),
+			$l10n->t('Install Client'),
 			'https://nextcloud.com/install/#install-clients'
 		);
 		$emailTemplate->addFooter();

tests/Settings/Mailer/NewUserMailHelperTest.php

@@ -22,6 +22,7 @@
 namespace Tests\Settings\Mailer;
 
 use OC\Mail\EMailTemplate;
+use OCP\L10N\IFactory;
 use OCP\Mail\IEMailTemplate;
 use OC\Mail\Message;
 use OC\Settings\Mailer\NewUserMailHelper;
@@ -64,6 +65,7 @@ class NewUserMailHelperTest extends TestCase {
 			->willReturn('myLogo');
 		$this->urlGenerator = $this->createMock(IURLGenerator::class);
 		$this->l10n = $this->createMock(IL10N::class);
+		$this->l10nFactory = $this->createMock(IFactory::class);
 		$this->mailer = $this->createMock(IMailer::class);
 		$template = new EMailTemplate(
 			$this->defaults,
@@ -82,11 +84,15 @@ class NewUserMailHelperTest extends TestCase {
 			->will($this->returnCallback(function ($text, $parameters = []) {
 				return vsprintf($text, $parameters);
 			}));
+		$this->l10nFactory->method('get')
+			->will($this->returnCallback(function ($text, $lang) {
+				return $this->l10n;
+			}));
 
 		$this->newUserMailHelper = new NewUserMailHelper(
 			$this->defaults,
 			$this->urlGenerator,
-			$this->l10n,
+			$this->l10nFactory,
 			$this->mailer,
 			$this->secureRandom,
 			$this->timeFactory,
@@ -113,15 +119,11 @@ class NewUserMailHelperTest extends TestCase {
 		/** @var IUser|\PHPUnit_Framework_MockObject_MockObject $user */
 		$user = $this->createMock(IUser::class);
 		$user
-			->expects($this->at(0))
-			->method('getEmailAddress')
-			->willReturn('recipient@example.com');
-		$user
-			->expects($this->at(1))
+			->expects($this->any())
 			->method('getEmailAddress')
 			->willReturn('recipient@example.com');
 		$this->config
-			->expects($this->at(0))
+			->expects($this->any())
 			->method('getSystemValue')
 			->with('secret')
 			->willReturn('MyInstanceWideSecret');
@@ -131,24 +133,20 @@ class NewUserMailHelperTest extends TestCase {
 			->with('12345:MySuperLongSecureRandomToken', 'recipient@example.comMyInstanceWideSecret')
 			->willReturn('TokenCiphertext');
 		$user
-			->expects($this->at(2))
+			->expects($this->any())
 			->method('getUID')
 			->willReturn('john');
 		$this->config
-			->expects($this->at(1))
+			->expects($this->once())
 			->method('setUserValue')
 			->with('john', 'core', 'lostpassword', 'TokenCiphertext');
-		$user
-			->expects($this->at(3))
-			->method('getUID')
-			->willReturn('john');
 		$this->urlGenerator
 			->expects($this->at(0))
 			->method('linkToRouteAbsolute')
 			->with('core.lost.resetform', ['userId' => 'john', 'token' => 'MySuperLongSecureRandomToken'])
 			->willReturn('https://example.com/resetPassword/MySuperLongSecureRandomToken');
 		$user
-			->expects($this->at(4))
+			->expects($this->any())
 			->method('getDisplayName')
 			->willReturn('john');
 		$user
@@ -385,11 +383,11 @@ EOF;
 		/** @var IUser|\PHPUnit_Framework_MockObject_MockObject $user */
 		$user = $this->createMock(IUser::class);
 		$user
-			->expects($this->at(0))
+			->expects($this->any())
 			->method('getDisplayName')
 			->willReturn('John Doe');
 		$user
-			->expects($this->at(1))
+			->expects($this->any())
 			->method('getUID')
 			->willReturn('john');
 		$this->defaults