Editing the "Send private message" link to include the username

Question

I'm using the Private Message module version 8.x-2.0-beta16 and I want to change the message from 'Send private message' to 'Send private message to @username' which should display the username from the user's page that we are visiting and contacting.

The module uses the following code.

'#title' => t('Send private message'),

Is there are way to override this line directly and insert the username? I tried without success.

The relevant code is located in: private_message\src\Service\PrivateMessageService.php#L336-382.

public function createRenderablePrivateMessageThreadLink(array &$build, EntityInterface $entity, EntityViewDisplayInterface $display, $view_mode) {
  if ($display->getComponent('private_message_link')) {
    if ($entity instanceof UserInterface) {
      $author = $entity;
    }
    else {
      $author = $entity->getOwner();
    }
    $current_user = \Drupal::currentUser();
    if ($current_user->isAuthenticated()) {
      if ($current_user->hasPermission('use private messaging system') && $current_user->id() != $author->id()) {
        $members = [$current_user, $author];
        $thread_id = $this->mapper->getThreadIdForMembers($members);
        if ($thread_id) {
          $url = Url::fromRoute('entity.private_message_thread.canonical', ['private_message_thread' => $thread_id], ['attributes' => ['class' => ['private_message_link']]]);
          $build['private_message_link'] = [
            '#type' => 'link',
            '#url' => $url,
            '#title' => t('Send private message'),
            '#prefix' => '<div class="private_message_link_wrapper">',
            '#suffix' => '</div>',
          ];
        }
        else {
          $url = Url::fromRoute('private_message.private_message_create', [], ['query' => ['recipient' => $author->id()]]);
          $build['private_message_link'] = [
            '#type' => 'link',
            '#url' => $url,
            '#title' => t('Send private message'),
            '#prefix' => '<div class="private_message_link_wrapper">',
            '#suffix' => '</div>',
          ];
        }
      }
    }
    else {
      $url = Url::fromRoute('user.login');
      $build['private_message_link'] = [
        '#type' => 'link',
        '#url' => $url,
        '#title' => t('Send private message'),
        '#prefix' => '<div class="private_message_link_wrapper">',
        '#suffix' => '</div>',
      ];
    }
  }   
}

Answer 1

I think you're asking, "How can I create a translated string 'Send a private message to @username' where @username is replaced with the name of the user currently being viewed?"

If you're viewing the user's page, you can do this like:

// Get the user object currently being viewed from the route parameters.
$user = \Drupal::routeMatch()->getParameter('user');
// If we have a valid user object.
if ($user instanceof Drupal\user\Entity\User) {
  $message = t('Send a private message to @username', [
    '@username' => $user->getDisplayName(),
  ]);
}

However, looking at the specific code you posted, you're not guaranteed to be on the user's page. Additionally, the user that is to receive the message is already determined and stored in $author:

// I.e. user's page.
if ($entity instanceof UserInterface) {
  $author = $entity;
}
// I.e. a node or other entity authored by a user.
else {
  $author = $entity->getOwner();
}

In this case, you could just use something like:

$message = t('Send a private message to @username', [
  '@username' => $author->getDisplayName(),
]);