LikeDislikeController.php in Like/Dislike 8

Namespace

Drupal\like_dislike\Controller

File

src/Controller/LikeDislikeController.php

<?php

namespace Drupal\like_dislike\Controller;

use Drupal\Core\Ajax\AjaxResponse;
use Drupal\Core\Ajax\HtmlCommand;
use Drupal\Core\Ajax\OpenModalDialogCommand;
use Drupal\Core\Controller\ControllerBase;
use Drupal\Core\Entity\EntityTypeManagerInterface;
use Drupal\Core\Link;
use Drupal\Core\Render\RendererInterface;
use Drupal\Core\Session\AccountInterface;
use Drupal\Core\Url;
use Symfony\Component\DependencyInjection\ContainerInterface;
use Symfony\Component\HttpFoundation\RequestStack;

/**
 * Class LikeDislikeController.
 *
 * @package Drupal\like_dislike\Controller
 */
class LikeDislikeController extends ControllerBase {

  /**
   * The request stack.
   *
   * @var \Symfony\Component\HttpFoundation\RequestStack
   */
  protected $requestStack;

  /**
   * The entity type manager.
   *
   * @var \Drupal\Core\Entity\EntityTypeManagerInterface
   */
  protected $entityTypeManager;

  /**
   * The current user service.
   *
   * @var \Drupal\Core\Session\AccountInterface
   */
  protected $currentUser;

  /**
   * The renderer.
   *
   * @var \Drupal\Core\Render\RendererInterface
   */
  protected $renderer;

  /**
   * Constructs an LinkClickCountController object.
   *
   * @param \Symfony\Component\HttpFoundation\RequestStack $request
   *   The request stack.
   * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
   *   The entity type manager.
   * @param \Drupal\Core\Session\AccountInterface $account
   *   The current user.
   * @param \Drupal\Core\Render\RendererInterface
   *   The renderer.
   */
  public function __construct(RequestStack $request, EntityTypeManagerInterface $entity_type_manager, AccountInterface $account, RendererInterface $renderer) {
    $this->requestStack = $request;
    $this->entityTypeManager = $entity_type_manager;
    $this->currentUser = $account;
    $this->renderer = $renderer;
  }

  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container) {
    return new static($container
      ->get('request_stack'), $container
      ->get('entity_type.manager'), $container
      ->get('current_user'), $container
      ->get('renderer'));
  }

  /**
   * Like or Dislike handler.
   *
   * @param string $clicked
   *   Status of the click link.
   * @param string $data
   *   Data passed from the formatter.
   *
   * @return AjaxResponse|string
   *   Response count for the like/dislike.
   */
  public function handler($clicked, $data) {
    $return = '';
    $response = new AjaxResponse();

    // Decode the url data
    $decode_data = json_decode(base64_decode($data));

    // Load the entity content.
    $entity_data = $this->entityTypeManager
      ->getStorage($decode_data->entity_type)
      ->load($decode_data->entity_id);
    $field_name = $decode_data->field_name;

    // Get the users who already clicked on this particular content.
    $users = json_decode($entity_data->{$field_name}->clicked_by);
    if ($users == NULL) {
      $users = new \stdClass();
      $users->default = 'default';
    }
    $user = $this->currentUser
      ->id();

    // If user is ananomous, ask him to register/login.
    if ($user == 0) {
      $destination = $this->requestStack
        ->getCurrentRequest()
        ->get('like-dislike-redirect');
      user_cookie_save([
        'destination' => $destination,
      ]);
      $user_login_register = $this
        ->like_dislike_login_register();
      $dialog_library['#attached']['library'][] = 'core/drupal.dialog.ajax';
      $response
        ->setAttachments($dialog_library['#attached']);
      return $response
        ->addCommand(new OpenModalDialogCommand('Like/Dislike', $user_login_register));
    }

    // Update content, based on like/dislike.
    $already_clicked = key_exists($user, array_keys((array) $users));
    if ($clicked == 'like') {
      if (!$already_clicked) {
        $entity_data->{$field_name}->likes++;
        $users->{$user} = 'like';
      }
      else {
        return $this
          ->like_dislike_status($response, $decode_data->entity_id);
      }
      $return = $response
        ->addCommand(new HtmlCommand('#like-' . $decode_data->entity_id, $entity_data->{$field_name}->likes));
    }
    elseif ($clicked == 'dislike') {
      if (!$already_clicked) {
        $entity_data->{$field_name}->dislikes--;
        $users->{$user} = "dislike";
      }
      else {
        return $this
          ->like_dislike_status($response, $decode_data->entity_id);
      }
      $return = $response
        ->addCommand(new HtmlCommand('#dislike-' . $decode_data->entity_id, $entity_data->{$field_name}->dislikes));
    }
    $entity_data->{$field_name}->clicked_by = json_encode($users);
    $entity_data
      ->save();
    return $return;
  }

  /**
   * Get the login and Registration options for ananomous user.
   *
   * @return mixed
   */
  protected function like_dislike_login_register() {
    $options = array(
      'attributes' => array(
        'class' => array(
          'use-ajax',
          'login-popup-form',
        ),
        'data-dialog-type' => 'modal',
      ),
    );
    $user_register = Url::fromRoute('user.register')
      ->setOptions($options);
    $user_login = Url::fromRoute('user.login')
      ->setOptions($options);
    $register = Link::fromTextAndUrl($this
      ->t('Register'), $user_register)
      ->toString();
    $login = Link::fromTextAndUrl($this
      ->t('Log in'), $user_login)
      ->toString();
    $content = array(
      'content' => array(
        '#markup' => "Only logged-in users are allowed to like/dislike. Visit " . $register . " | " . $login,
      ),
    );
    return $this->renderer
      ->render($content);
  }

  /**
   * Respond with the status, if user already liked/disliked.
   *
   * @param AjaxResponse $response
   * @param $entity_id
   * @return AjaxResponse
   */
  protected function like_dislike_status(AjaxResponse $response, $entity_id) {
    return $response
      ->addCommand(new HtmlCommand('#like_dislike_status-' . $entity_id, 'Already liked/disliked..!'));
  }

}

Classes

Name	Description
LikeDislikeController	Class LikeDislikeController.