Creating a Twitter Share block programmatically in Drupal 8

How to Create a Twitter Share block programmatically in Drupal 8. Which includes few minor stuff like

• Accessing the Current Node data in Block.
• How do we create the link programmatically.
• Disable cache for particular block.

  public function build() {    $node = \Drupal::request()->attributes->get('node');    $options = array(      'query' => array(        'text' => t($node->getTitle()),        'hashtags' => t('drupal'),        'via' => t('heykarthikwithu'),      ),      'attributes' => array(        'target' => '_blank',        'class' => 'twitter-share'      ),    );    $url = Url::fromUri('https://twitter.com/share', $options);    $link = Link::fromTextAndUrl('Share it on Twitter..?', $url);    $build['#markup'] = $link->toString();    $build['#cache']['max-age'] = 0;    return $build;  }

Well this was the piece of code which is written in this site to share content in Twitter..

1. Accessing the Current Node data in Block

$node = \Drupal::request()->attributes->get('node');

2. To Create the link programmatically

    $options = array(      'query' => array(        'text' => t($node->getTitle()),        'hashtags' => t('drupal'),        'via' => t('heykarthikwithu'),      ),      'attributes' => array(        'target' => '_blank',        'class' => 'twitter-share'      ),    );    $url = Url::fromUri('https://twitter.com/share', $options);    $link = Link::fromTextAndUrl('Share it on Twitter..?', $url);    $build['#markup'] = $link->toString();

3. To disable cache for particular block

$build['#cache']['max-age'] = 0;

Thank you :)