D8 Match a canonical route

routematch.php

<?php
//If is frontpage
$on_frontpage = \Drupal::service('path.matcher')->isFrontPage();

//Match canonical route
$route_match = \Drupal::routeMatch();
if ($route_match->getRouteName() == 'entity.node.canonical') {
  // Do something..
}

// Match alias
$current_path = \Drupal::service('path.current')->getPath();
if($current_path == '/user/login') {
  // Do something..
}