--- /dev/null
+<?php
+
+namespace Drupal\permissions_by_term\Form;
+
+use Drupal\Core\Form\ConfigFormBase;
+use Drupal\Core\Form\FormStateInterface;
+
+
+class SettingsForm extends ConfigFormBase {
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getFormId() {
+ return 'permissions_by_term_settings';
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function getEditableConfigNames() {
+ return [
+ 'permissions_by_term.settings'
+ ];
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function buildForm(array $form, FormStateInterface $form_state) {
+ $config = $this->config('permissions_by_term.settings');
+
+ $form = parent::buildForm($form, $form_state);
+
+ $description = <<<EOT
+By default users have granted access to an node, as long they have access to a <strong>single</strong>
+related taxonomy term. If the single term restriction option is checked, they must
+have access to <strong>all</strong> related taxonomy terms to access an node. Because as soon the
+specific node is related to a "single" non-permitted taxonomy term, the access will
+be disallowed.
+EOT;
+
+ $form['single_term_restriction'] = [
+ '#type' => 'checkbox',
+ '#title' => t('Single Term Restriction'),
+ '#description' => t($description),
+ '#default_value' => \Drupal::config('permissions_by_term.settings.single_term_restriction')->get('value'),
+ ];
+
+ return parent::buildForm($form, $form_state);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function submitForm(array &$form, FormStateInterface $form_state) {
+ \Drupal::configFactory()
+ ->getEditable('permissions_by_term.settings.single_term_restriction')
+ ->set('value', $form_state->getValue('single_term_restriction'))
+ ->save();
+
+ node_access_rebuild(true);
+
+ parent::submitForm($form, $form_state);
+ }
+
+}