social_post_facebook-8.x-1.x-dev/social_post_facebook.module

<?php

/**
 * @file
 * Contains social_post_facebook.module.
 */

use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Url;
use Drupal\Core\Session\AccountInterface;
use Drupal\social_post\Entity\SocialPost;

/**
 * Implements hook_form_FORM_ID_alter().
 */
function social_post_facebook_form_user_form_alter(&$form, FormStateInterface $form_state, $form_id) {

  // If the for is the user edit form, not user register form or others.
  // @see https://www.drupal.org/node/2854977
  if ($form_id == 'user_form') {
    $current_user = \Drupal::currentUser();

    if (_social_post_facebook_can_grant_permission($current_user)) {
      // Add a button to authorize facebook autoposting.
      $form += _social_post_facebook_user_edit_form($current_user);
    }
  }
}

/**
 * Check if the user is allowed to grant permission for autoposting.
 *
 * @param \Drupal\Core\Session\AccountInterface $current_user
 *   The current user.
 *
 * @return bool
 *   The user can or cannot allow post on his behalf.
 */
function _social_post_facebook_can_grant_permission(AccountInterface $current_user) {
  $routeMatch = \Drupal::service('current_route_match');

  // If the current user has permission to autotwet and its id is the same as
  // the user id of parameter.
  if ($current_user->hasPermission('perform facebook autoposting tasks')
    && $current_user->id() == $routeMatch->getParameter('user')->id()) {
    return TRUE;
  }

  return FALSE;
}

/**
 * Creates elements to the user edit form.
 *
 * @param \Drupal\Core\Session\AccountInterface $current_user
 *   The current user.
 *
 * @return array
 *   The elements to add to the user edit form.
 */
function _social_post_facebook_user_edit_form(AccountInterface $current_user) {
  $accounts = _social_post_facebook_get_accounts_by_uid($current_user->id());

  $form['social_post_facebook'] = [
    '#type' => 'details',
    '#title' => t('Social Post Facebook'),
    '#open' => TRUE,
  ];
  $form['social_post_facebook']['accounts'] = [
    '#type' => 'table',
    '#header' => [t('Screen name'), t('Operations')],
    '#empty' => t('You have not added any account yet.'),
  ];

  /* @var \Drupal\social_post\Entity\SocialPost $account */
  foreach ($accounts as $id => $account) {
    $form['social_post_facebook']['accounts'][$id]['screen_name'] = [
      '#type' => 'link',
      '#title' => $account->getName(),
      '#url' => Url::fromUri('https://facebook.com/' . $account->getProviderUserId()),
    ];
    $form['social_post_facebook']['accounts'][$id]['operations'] = [
      '#type' => 'operations',
      '#links' => [
        'delete' => [
          'title' => t('Delete'),
          'url' => Url::fromRoute('entity.social_post.delete_form', ['provider' => 'facebook', 'social_post' => $account->getId(), 'user' => $current_user->id()]),
        ],
      ],
    ];
  }

  $form['social_post_facebook']['button'] = [
    '#type' => 'link',
    '#title' => t("Add account"),
    '#attributes' => [
      'class' => ['button'],
    ],
    '#url' => Url::fromRoute('social_post_facebook.redirect_to_facebook_for_user'),
  ];

  $form['social_post_facebook']['help'] = [
    '#type' => 'item',
    '#markup' => t('When adding an account, please only authorize the app to post to a single page.'),
    '#access' => empty($accounts),
  ];

  return $form;
}

/**
 * Gets the accounts associated to the Drupal user.
 *
 * @param int $user_id
 *   The user id.
 *
 * @return \Drupal\social_post\Entity\SocialPost[]
 *   Accounts associated to the user id.
 */
function _social_post_facebook_get_accounts_by_uid($user_id) {
  $accounts = \Drupal::entityTypeManager()->getStorage('social_post')->loadByProperties([
    'user_id' => $user_id,
    'plugin_id' => 'social_post_facebook',
  ]);

  return $accounts;
}

/**
 * Gets the accounts associated to the Drupal user.
 *
 * @param \Drupal\social_post\Entity\SocialPost $account
 *   A social post entity.
 *
 * @return array
 *   An array containing details about pages associated with the facebook account.
 */
function social_post_facebook_get_pages($account) {
  $value = $account->get('additional_data')->first()->getValue();
  return unserialize($value['value']);
}

function social_post_facebook_post_to_page($user_id, $page_id, $message, $link = '') {
  $accounts = _social_post_facebook_get_accounts_by_uid(($user_id));
  $account = array_pop($accounts);
  if (!$account) {
    \Drupal::logger('social_post_facebook')->error('Could not post to Facebook page @page_id. No such account for @user_id',
      [
        '@page_id' => $page_id,
        '@user_id' => $user_id,
      ]
    );
    return FALSE;
  }
  $pages = social_post_facebook_get_pages($account);
  $page = isset($pages[$page_id]) ? $pages[$page_id] : FALSE;
  if (!$page) {
    \Drupal::logger('social_post_facebook')->error('Could not post to Facebook page @page_id. No such page for @user_id',
      [
        '@page_id' => $page_id,
        '@user_id' => $user_id,
      ]
    );
    return FALSE;
  }
  $token = $page['long_access_token'];
  $client = \Drupal::service('plugin.network.manager')->createInstance('social_post_facebook')->getSdk();
  return $client->postToPage($page_id, $token, $message, $link);
}