+<?php
+
+namespace Drupal\redirect_domain\Form;
+
+use Drupal\Core\Form\ConfigFormBase;
+use Drupal\Core\Form\FormStateInterface;
+
+/**
+ * Provides a redirect domain configuration form.
+ */
+class RedirectDomainForm extends ConfigFormBase {
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getFormId() {
+ return 'form_redirect_domain_form';
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function getEditableConfigNames() {
+ return [
+ 'redirect_domain.domains',
+ ];
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function buildForm(array $form, FormStateInterface $form_state) {
+ if (!$form_state->has('maximum_domains')) {
+ $form_state->set('maximum_domains', 1);
+ }
+
+ $form['redirects'] = [
+ '#type' => 'table',
+ '#tree' => TRUE,
+ '#header' => [
+ $this->t('From domain'),
+ $this->t('Sub path'),
+ $this->t('Destination')
+ ],
+ '#prefix' => '<div id="redirect-domain-wrapper">',
+ '#suffix' => '</div>',
+ ];
+
+ $rows = [];
+ // Obtain domain redirects from configuration.
+ if ($domain_redirects = $this->config('redirect_domain.domains')->get('domain_redirects')) {
+ foreach ($domain_redirects as $key => $value) {
+ foreach ($value as $item) {
+ $form['redirects'][] = [
+ 'from' => [
+ '#type' => 'textfield',
+ '#value' => str_replace(':','.',$key),
+ ],
+ 'sub_path' => [
+ '#type' => 'textfield',
+ '#value' => $item['sub_path'],
+ ],
+ 'destination' => [
+ '#type' => 'textfield',
+ '#value' => $item['destination'],
+ ],
+ ];
+ }
+ }
+ }
+
+ // Fields for the new domain redirects.
+ for ($i = 0; $i < $form_state->get('maximum_domains'); $i++) {
+ $form['redirects'][] = [
+ 'from' => [
+ '#type' => 'textfield',
+ ],
+ 'sub_path' => [
+ '#type' => 'textfield',
+ '#value' => '/',
+ ],
+ 'destination' => [
+ '#type' => 'textfield',
+ ],
+ ];
+ }
+
+ $form['add'] = [
+ '#type' => 'submit',
+ '#value' => $this->t('Add another'),
+ '#submit' => ['::addAnotherSubmit'],
+ '#ajax' => [
+ 'callback' => '::ajaxAddAnother',
+ 'wrapper' => 'redirect-domain-wrapper',
+ ],
+ ];
+ $form['submit'] = [
+ '#type' => 'submit',
+ '#button_type' => 'primary',
+ '#value' => $this->t('Save'),
+ ];
+ return $form;
+ }
+
+ /**
+ * Ajax callback for adding another domain redirect.
+ *
+ * @param array $form
+ * The form structure.
+ * @param \Drupal\Core\Form\FormStateInterface $form_state
+ * The form state.
+ *
+ * @return array
+ * The new domain redirect form part.
+ */
+ public function ajaxAddAnother(array $form, FormStateInterface $form_state) {
+ return $form['redirects'];
+ }
+
+ /**
+ * Submit callback for adding a new domain field.
+ */
+ public function addAnotherSubmit(array $form, FormStateInterface $form_state) {
+ $form_state->set('maximum_domains', $form_state->get('maximum_domains') + 1);
+ $form_state->setRebuild(TRUE);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function validateForm(array &$form, FormStateInterface $form_state) {
+ parent::validateForm($form, $form_state);
+ if ($redirects = $form_state->getValue('redirects')) {
+ foreach ($redirects as $redirect) {
+ if (strpos($redirect['from'], '://') !== FALSE) {
+ $form_state->setErrorByName('redirects', t('No protocol should be included in the redirect domain.'));
+ }
+ }
+ }
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function submitForm(array &$form, FormStateInterface $form_state) {
+ $domain_redirects = [];
+ $domain_config = $this->config('redirect_domain.domains');
+
+ if ($redirects = $form_state->getValue('redirects')) {
+ foreach ($redirects as $redirect) {
+ if (!empty($redirect['from']) && !empty($redirect['destination'])) {
+ // Replace '.' with ':' for an eligible key.
+ $redirect['from'] = str_replace('.', ':', $redirect['from']);
+ $domain_redirects[$redirect['from']][] = [
+ 'sub_path' => '/' . ltrim($redirect['sub_path'], '/'),
+ 'destination' => $redirect['destination']
+ ];
+ }
+ }
+ }
+ $domain_config->set('domain_redirects', $domain_redirects);
+ $domain_config->save();
+ drupal_set_message(t('The domain redirects have been saved.'));
+ }
+}