protected function CaptchaWebTestBase::getMathCaptchaSolutionFromForm in CAPTCHA 8

Get the solution of the math CAPTCHA from the current form in the browser.

Parameters

null|string $form_html_id: HTML form id attribute.

Return value

int Calculated Math solution.

File

tests/src/Functional/CaptchaWebTestBase.php, line 231

Class

CaptchaWebTestBase

Base class for CAPTCHA tests.

Namespace

Drupal\Tests\captcha\Functional

Code

protected function getMathCaptchaSolutionFromForm($form_html_id = NULL) {

  // Get the math challenge.
  if (!$form_html_id) {
    $elements = $this
      ->xpath('//div[contains(@class, "form-item-captcha-response")]/span[@class="field-prefix"]');
  }
  else {
    $elements = $this
      ->xpath('//form[@id="' . $form_html_id . '"]//div[contains(@class, "form-item-captcha-response")]/span[@class="field-prefix"]');
  }
  $this
    ->assertTrue('pass', json_encode($elements));
  $challenge = (string) $elements[0];
  $this
    ->assertTrue('pass', $challenge);

  // Extract terms and operator from challenge.
  $matches = [];
  preg_match('/\\s*(\\d+)\\s*(-|\\+)\\s*(\\d+)\\s*=\\s*/', $challenge, $matches);

  // Solve the challenge.
  $a = (int) $matches[1];
  $b = (int) $matches[3];
  $solution = $matches[2] == '-' ? $a - $b : $a + $b;
  return $solution;
}