Issue #3017812 by ibustos, joachim: Language selector is immune to hook_entity_field_access in entity forms

(cherry picked from commit f6674fa)

Author: alexpott

modules/language/language.module

@@ -381,7 +381,7 @@ function language_form_alter(&$form, FormStateInterface $form_state) {
     $entity = $form_object->getEntity();
     $entity_type = $entity->getEntityType();
     $langcode_key = $entity_type->getKey('langcode');
-    if (isset($form[$langcode_key])) {
+    if (isset($form[$langcode_key]) && $form[$langcode_key]['#access'] !== FALSE) {
       $language_configuration = ContentLanguageSettings::loadByEntityTypeBundle($entity->getEntityTypeId(), $entity->bundle());
       $form[$langcode_key]['#access'] = $language_configuration->isLanguageAlterable();
     }

modules/language/tests/language_entity_field_access_test/config/install/language.content_settings.node.page.yml

@@ -0,0 +1,10 @@
+langcode: en
+status: true
+dependencies:
+  config:
+    - node.type.page
+id: node.page
+target_entity_type_id: node
+target_bundle: page
+default_langcode: site_default
+language_alterable: true

modules/language/tests/language_entity_field_access_test/config/install/node.type.page.yml

@@ -0,0 +1,10 @@
+langcode: en
+status: true
+dependencies: {  }
+name: page
+type: page
+description: ''
+help: ''
+new_revision: false
+preview_mode: 1
+display_submitted: false

modules/language/tests/language_entity_field_access_test/language_entity_field_access_test.info.yml

@@ -0,0 +1,12 @@
+name: 'Language entity field access test'
+type: module
+description: 'Support module for verifying entity field access and the language selector.'
+core: 8.x
+package: Testing
+version: VERSION
+dependencies:
+  - drupal:node
+  - drupal:text
+  - drupal:field
+  - drupal:filter
+  - drupal:language

modules/language/tests/language_entity_field_access_test/language_entity_field_access_test.module

@@ -0,0 +1,18 @@
+<?php
+
+/**
+ * @file
+ * Hook implementations for language_entity_field_access_test.
+ */
+
+use Drupal\Core\Access\AccessResult;
+use Drupal\Core\Field\FieldDefinitionInterface;
+use Drupal\Core\Field\FieldItemListInterface;
+use Drupal\Core\Session\AccountInterface;
+
+/**
+ * Implements hook_entity_field_access().
+ */
+function language_entity_field_access_test_entity_field_access($operation, FieldDefinitionInterface $field_definition, AccountInterface $account, FieldItemListInterface $items = NULL) {
+  return AccessResult::forbidden();
+}

modules/language/tests/src/Functional/LanguageEntityFieldAccessHookTest.php

@@ -0,0 +1,43 @@
+<?php
+
+namespace Drupal\Tests\language\Functional;
+
+use Drupal\Tests\BrowserTestBase;
+
+/**
+ * Tests language picker compatibility with hook_entity_field_access.
+ *
+ * @group language
+ */
+class LanguageEntityFieldAccessHookTest extends BrowserTestBase {
+
+  /**
+   * Modules to enable.
+   *
+   * @var array
+   */
+  public static $modules = [
+    'node',
+    'text',
+    'field',
+    'filter',
+    'language',
+    'language_entity_field_access_test',
+  ];
+
+  /**
+   * Tests compatibility with hook_entity_field_access().
+   */
+  public function testHookEntityFieldAccess() {
+    // Create an admin user and do the login.
+    $user = $this->drupalCreateUser([], NULL, TRUE);
+    $this->drupalLogin($user);
+
+    // Assess the field is not visible.
+    $this->drupalGet('node/add/page');
+    $this->assertSession()->fieldNotExists('langcode[0][value]');
+
+    $this->drupalLogout();
+  }
+
+}