expo qr code to get visitors email

web/modules/custom/materio_expo/src/Controller/QRController.php

@@ -0,0 +1,45 @@
+<?php
+
+namespace Drupal\materio_expo\Controller;
+
+use Drupal\Core\Controller\ControllerBase;
+use Symfony\Component\HttpFoundation\RedirectResponse;
+use Drupal\Core\Url;
+
+/**
+ * Class QRController.
+ */
+class QRController extends ControllerBase {
+
+  /**
+   * Hello.
+   *
+   * @return string
+   *   Return Hello string.
+   */
+  public function getfile($ref) {
+    //? https://drupal.stackexchange.com/questions/255216/how-to-do-a-redirectresponse-with-a-destination-query-parameter
+
+    //* get node from ref
+    $entity_storage = \Drupal::entityTypeManager()->getStorage('node');
+    $query = $entity_storage->getQuery()
+      ->condition('type', 'materiau')
+      ->condition('status', '1')
+      ->condition('field_reference', $ref);
+    $results = $query->execute();
+    $nid = array_pop($results);
+    $node = $entity_storage->load($nid);
+
+    //* get file from node
+    $file = $node->get('field_fiche_expo')->referencedEntities()[0];
+
+    //* redirect to file
+    return new RedirectResponse($file->createFileUrl());
+
+    // return [
+    //   '#type' => 'markup',
+    //   '#markup' => $this->t("Implement method: getfile with parameter(s): $ref"),
+    // ];
+  }
+
+}

web/modules/custom/materio_expo/src/Form/GetEmail.php

@@ -0,0 +1,98 @@
+<?php
+
+namespace Drupal\materio_expo\Form;
+
+use Drupal\Core\Form\FormBase;
+use Drupal\Core\Form\FormStateInterface;
+// use Symfony\Component\HttpFoundation\Cookie;
+use Symfony\Component\HttpFoundation\RedirectResponse;
+use Drupal\Core\Url;
+
+/**
+ * Class GetEmail.
+ */
+class GetEmail extends FormBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getFormId() {
+    return 'get_email';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildForm(array $form, FormStateInterface $form_state, $ref = null) {
+    
+    // check if email cookie is already present
+    $session = \Drupal::request()->getSession();
+    $alreadysetemail = $session->get('materio_expo_email');
+    if($alreadysetemail){
+      // https://x-team.com/blog/drupal-goto/
+      $url = Url::fromRoute('materio_expo.qr_controller_getfile', ['ref'=>$ref], ['absolute' => TRUE]);
+      return new RedirectResponse($url->toString());
+    }else{
+      $form['email'] = [
+        '#type' => 'email',
+        // '#title' => $this->t('Email'),
+        '#attributes' => [
+          'placeholder' => $this->t('Email')
+        ],
+        '#weight' => '0',
+      ];
+      
+      $form['ref'] = [
+        '#type' => 'hidden',
+        '#value' => $ref
+      ];
+  
+      $form['submit'] = [
+        '#type' => 'submit',
+        '#value' => $this->t("Submit"),
+      ];
+      return $form;
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function validateForm(array &$form, FormStateInterface $form_state) {
+    parent::validateForm($form, $form_state);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitForm(array &$form, FormStateInterface $form_state) {
+    $values = $form_state->getValues();
+
+    //* send form submission by email
+    $mailManager = \Drupal::service('plugin.manager.mail');
+    $module = 'materio_expo';
+    $key = 'expo_getmail_submitted';
+    $to = \Drupal::config('system.site')->get('mail');
+    $params['mail'] = $values['mail'];
+    $params['message'] = $values['mail'];
+    $langcode = \Drupal::languageManager()->getCurrentLanguage()->getId();
+    $send = true;
+
+    $result = $mailManager->mail($module, $key, $to, $langcode, $params, NULL, $send);
+    if ($result['result'] !== true) {
+      $logger = \Drupal::logger('flag_lists');
+      $logger->error('There was a problem sending your message.' . $values['mail']);
+    }
+
+    //* record email as session variable
+    // https://drupal.stackexchange.com/questions/197576/storing-data-session-for-anonymous-user
+    $session = \Drupal::request()->getSession();
+    $session->set('materio_expo_email', true);
+
+    //* redirect to getfile controller
+    $ref = $values['ref'];
+    $form_state->setRedirect('materio_expo.qr_controller_getfile', ['ref'=>$ref]);
+
+  }
+
+}