tfa.module

<?php

/**
 * @file
 * Contains tfa.module.
 */

use Drupal\Component\Render\PlainTextOutput;
use Drupal\Core\Session\AccountInterface;
use Drupal\block\Entity\Block;
use Drupal\Core\Routing\RouteMatchInterface;
use Drupal\Core\Access\AccessResult;
use Drupal\Component\Utility\Html;

/**
 * Implements hook_help().
 */
function tfa_help($route_name, RouteMatchInterface $route_match) {
  switch ($route_name) {
    // Main module help for the tfa module.
    case 'help.page.tfa':
      $output = '';
      $output .= '<h3>' . \Drupal::translation()->translate('About') . '</h3>';
      $output .= '<p>' . \Drupal::translation()->translate('Pluggable provider of second factor authentication for Drupal. For more information, see the online documentation for the <a href=":tfa">Two-factor Authentication</a> module.',
          [
            ':tfa' => 'https://www.drupal.org/project/tfa',
          ]) . '</p>';
      return $output;
  }
}

/**
 * Implements hook_block_access().
 *
 * Remove access to the core user_login_block so we can replace with the TFA
 * login block.
 */
function tfa_block_access(Block $block, $operation, AccountInterface $account) {
  if (\Drupal::config('tfa.settings')->get('enabled') && $block->getPluginId() === 'user_login_block') {
    return AccessResult::forbidden();
  }
}

/**
 * Implements hook_mail().
 */
function tfa_mail($key, &$message, $params) {
  if ($key === 'tfa_send_code') {
    $options = array(
      'langcode' => $params['langcode'],
    );

    $email = \Drupal::config('system.site')->get('mail');
    $message['from'] = $email;
    $message['subject'] =  t('@title', array('@title' => $params['title']), $options);
    $message['body'][] = Html::escape($params['message']);
  }
  else {
    $token_service = \Drupal::token();
    $language_manager = \Drupal::languageManager();
    $variables = ['user' => $params['account']];

    $language = $language_manager->getLanguage($params['account']->getPreferredLangcode());
    $original_language = $language_manager->getConfigOverrideLanguage();
    $language_manager->setConfigOverrideLanguage($language);
    $tfa_config = \Drupal::config('tfa.settings');

    $token_options = [
      'langcode' => $message['langcode'],
      'clear' => TRUE,
    ];

    // Configuration mapping key matches the hook_mail() $key.
    $subject = $tfa_config->get("mail.{$key}.subject");
    $subject = $token_service->replace($subject, $variables, $token_options);
    $message['subject'] = PlainTextOutput::renderFromHtml($subject);

    $body = $tfa_config->get("mail.{$key}.body");
    $message['body'][] = $token_service->replace($body, $variables, $token_options);

    $language_manager->setConfigOverrideLanguage($original_language);
  }
}