class DateFormatTest

class DateFormatTest extends WebDriverTestBase {
  
  /**
   * {@inheritdoc}
   */
  protected static $modules = [
    'block',
  ];
  
  /**
   * {@inheritdoc}
   */
  protected $defaultTheme = 'stark';
  
  /**
   * {@inheritdoc}
   */
  protected function setUp() : void {
    parent::setUp();
    // Create admin user and log in admin user.
    $this->drupalLogin($this->drupalCreateUser([
      'administer site configuration',
    ]));
    $this->drupalPlaceBlock('local_actions_block');
  }
  
  /**
   * Tests XSS via date format configuration.
   */
  public function testDateFormatXss() {
    $page = $this->getSession()
      ->getPage();
    $assert = $this->assertSession();
    $date_format = DateFormat::create([
      'id' => 'xss_short',
      'label' => 'XSS format',
      'pattern' => '\\<\\s\\c\\r\\i\\p\\t\\>\\a\\l\\e\\r\\t\\(\\"\\X\\S\\S\\")\\;\\<\\/\\s\\c\\r\\i\\p\\t\\>',
    ]);
    $date_format->save();
    $this->drupalGet('admin/config/regional/date-time');
    $assert->assertEscaped('<script>alert("XSS");</script>', 'The date format was properly escaped');
    $this->drupalGet('admin/config/regional/date-time/formats/manage/xss_short');
    $assert->assertEscaped('<script>alert("XSS");</script>', 'The date format was properly escaped');
    // Add a new date format with HTML in it.
    $this->drupalGet('admin/config/regional/date-time/formats/add');
    $date_format = '& \\<\\e\\m\\>Y\\<\\/\\e\\m\\>';
    $page->fillField('date_format_pattern', $date_format);
    $assert->waitForText('Displayed as');
    $assert->assertEscaped('<em>' . date("Y") . '</em>');
    $page->fillField('label', 'date_html_pattern');
    // Wait for the machine name ID to be completed.
    $assert->waitForLink('Edit');
    $page->pressButton('Add format');
    $assert->pageTextContains('Custom date format added.');
    $assert->assertEscaped('<em>' . date("Y") . '</em>');
  }

}