--- /dev/null
+<?php
+
+namespace Drupal\system\Form;
+
+use Drupal\Core\Config\PreExistingConfigException;
+use Drupal\Core\Config\UnmetDependenciesException;
+use Drupal\Core\Extension\ModuleHandlerInterface;
+use Drupal\Core\Extension\ModuleInstallerInterface;
+use Drupal\Core\Form\ConfirmFormBase;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\KeyValueStore\KeyValueStoreExpirableInterface;
+use Drupal\Core\Url;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Builds a confirmation form for enabling modules with dependencies.
+ */
+class ModulesListConfirmForm extends ConfirmFormBase {
+
+ /**
+ * The module handler service.
+ *
+ * @var \Drupal\Core\Extension\ModuleHandlerInterface
+ */
+ protected $moduleHandler;
+
+ /**
+ * The expirable key value store.
+ *
+ * @var \Drupal\Core\KeyValueStore\KeyValueStoreExpirableInterface
+ */
+ protected $keyValueExpirable;
+
+ /**
+ * An associative list of modules to enable or disable.
+ *
+ * @var array
+ */
+ protected $modules = [];
+
+ /**
+ * The module installer.
+ *
+ * @var \Drupal\Core\Extension\ModuleInstallerInterface
+ */
+ protected $moduleInstaller;
+
+ /**
+ * Constructs a ModulesListConfirmForm object.
+ *
+ * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
+ * The module handler.
+ * @param \Drupal\Core\Extension\ModuleInstallerInterface $module_installer
+ * The module installer.
+ * @param \Drupal\Core\KeyValueStore\KeyValueStoreExpirableInterface $key_value_expirable
+ * The key value expirable factory.
+ */
+ public function __construct(ModuleHandlerInterface $module_handler, ModuleInstallerInterface $module_installer, KeyValueStoreExpirableInterface $key_value_expirable) {
+ $this->moduleHandler = $module_handler;
+ $this->moduleInstaller = $module_installer;
+ $this->keyValueExpirable = $key_value_expirable;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public static function create(ContainerInterface $container) {
+ return new static(
+ $container->get('module_handler'),
+ $container->get('module_installer'),
+ $container->get('keyvalue.expirable')->get('module_list')
+ );
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getQuestion() {
+ return $this->t('Some required modules must be enabled');
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getCancelUrl() {
+ return new Url('system.modules_list');
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getConfirmText() {
+ return $this->t('Continue');
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getDescription() {
+ return $this->t('Would you like to continue with the above?');
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getFormId() {
+ return 'system_modules_confirm_form';
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function buildForm(array $form, FormStateInterface $form_state) {
+ $account = $this->currentUser()->id();
+ $this->modules = $this->keyValueExpirable->get($account);
+
+ // Redirect to the modules list page if the key value store is empty.
+ if (!$this->modules) {
+ return $this->redirect('system.modules_list');
+ }
+
+ $items = $this->buildMessageList();
+ $form['message'] = [
+ '#theme' => 'item_list',
+ '#items' => $items,
+ ];
+
+ return parent::buildForm($form, $form_state);
+ }
+
+ /**
+ * Builds the message list for the confirmation form.
+ *
+ * @return \Drupal\Component\Render\MarkupInterface[]
+ * Array of markup for the list of messages on the form.
+ *
+ * @see \Drupal\system\Form\ModulesListForm::buildModuleList()
+ */
+ protected function buildMessageList() {
+ $items = [];
+ if (!empty($this->modules['dependencies'])) {
+ // Display a list of required modules that have to be installed as well
+ // but were not manually selected.
+ foreach ($this->modules['dependencies'] as $module => $dependencies) {
+ $items[] = $this->formatPlural(count($dependencies), 'You must enable the @required module to install @module.', 'You must enable the @required modules to install @module.', [
+ '@module' => $this->modules['install'][$module],
+ // It is safe to implode this because module names are not translated
+ // markup and so will not be double-escaped.
+ '@required' => implode(', ', $dependencies),
+ ]);
+ }
+ }
+ return $items;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function submitForm(array &$form, FormStateInterface $form_state) {
+ // Remove the key value store entry.
+ $account = $this->currentUser()->id();
+ $this->keyValueExpirable->delete($account);
+
+ if (!empty($this->modules['install'])) {
+ // Don't catch the exception that this can throw for missing dependencies:
+ // the form doesn't allow modules with unmet dependencies, so the only way
+ // this can happen is if the filesystem changed between form display and
+ // submit, in which case the user has bigger problems.
+ try {
+ // Install the given modules.
+ $this->moduleInstaller->install(array_keys($this->modules['install']));
+ }
+ catch (PreExistingConfigException $e) {
+ $config_objects = $e->flattenConfigObjects($e->getConfigObjects());
+ drupal_set_message(
+ $this->formatPlural(
+ count($config_objects),
+ 'Unable to install @extension, %config_names already exists in active configuration.',
+ 'Unable to install @extension, %config_names already exist in active configuration.',
+ [
+ '%config_names' => implode(', ', $config_objects),
+ '@extension' => $this->modules['install'][$e->getExtension()]
+ ]),
+ 'error'
+ );
+ return;
+ }
+ catch (UnmetDependenciesException $e) {
+ drupal_set_message(
+ $e->getTranslatedMessage($this->getStringTranslation(), $this->modules['install'][$e->getExtension()]),
+ 'error'
+ );
+ return;
+ }
+
+ $module_names = array_values($this->modules['install']);
+ drupal_set_message($this->formatPlural(count($module_names), 'Module %name has been enabled.', '@count modules have been enabled: %names.', [
+ '%name' => $module_names[0],
+ '%names' => implode(', ', $module_names),
+ ]));
+ }
+
+ $form_state->setRedirectUrl($this->getCancelUrl());
+ }
+
+}