class TriggeringElementTest

class TriggeringElementTest extends WebDriverTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'form_test',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * Tests the triggering element when no button information is included.
     *
     * Test the determination of the triggering element when no button
     * information is included in the POST data, as is sometimes the case when
     * the ENTER key is pressed in a textfield in Internet Explorer.
     */
    public function testNoButtonInfoInPost() {
        $path = '/form-test/clicked-button';
        $form_html_id = 'form-test-clicked-button';
        // Ensure submitting a form with no buttons results in no triggering element
        // and the form submit handler not running.
        $this->drupalGet($path);
        $assert_session = $this->assertSession();
        $this->getSession()
            ->getDriver()
            ->submitForm('//form[@id="' . $form_html_id . '"]');
        $assert_session->pageTextContains('There is no clicked button.');
        $assert_session->pageTextNotContains('Submit handler for form_test_clicked_button executed.');
        // Ensure submitting a form with one or more submit buttons results in the
        // triggering element being set to the first one the user has access to. An
        // argument with 'r' in it indicates a restricted (#access=FALSE) button.
        $this->drupalGet($path . '/s');
        $this->getSession()
            ->getDriver()
            ->submitForm('//form[@id="' . $form_html_id . '"]');
        $assert_session->pageTextContains('The clicked button is button1.');
        $assert_session->pageTextContains('Submit handler for form_test_clicked_button executed.');
        $this->drupalGet($path . '/s/s');
        $this->getSession()
            ->getDriver()
            ->submitForm('//form[@id="' . $form_html_id . '"]');
        $assert_session->pageTextContains('The clicked button is button1.');
        $assert_session->pageTextContains('Submit handler for form_test_clicked_button executed.');
        $this->drupalGet($path . '/rs/s');
        $this->getSession()
            ->getDriver()
            ->submitForm('//form[@id="' . $form_html_id . '"]');
        $assert_session->pageTextContains('The clicked button is button2.');
        $assert_session->pageTextContains('Submit handler for form_test_clicked_button executed.');
        // Ensure submitting a form with buttons of different types results in the
        // triggering element being set to the first button, regardless of type. For
        // the FAPI 'button' type, this should result in the submit handler not
        // executing. The types are 's' (submit), 'b' (button), and 'i'
        // (image_button).
        $this->drupalGet($path . '/s/b/i');
        $this->getSession()
            ->getDriver()
            ->submitForm('//form[@id="' . $form_html_id . '"]');
        $assert_session->pageTextContains('The clicked button is button1.');
        $assert_session->pageTextContains('Submit handler for form_test_clicked_button executed.');
        $this->drupalGet($path . '/b/s/i');
        $this->getSession()
            ->getDriver()
            ->submitForm('//form[@id="' . $form_html_id . '"]');
        $assert_session->pageTextContains('The clicked button is button1.');
        $assert_session->pageTextNotContains('Submit handler for form_test_clicked_button executed.');
        $this->drupalGet($path . '/i/s/b');
        $this->getSession()
            ->getDriver()
            ->submitForm('//form[@id="' . $form_html_id . '"]');
        $assert_session->pageTextContains('The clicked button is button1.');
        $assert_session->pageTextContains('Submit handler for form_test_clicked_button executed.');
    }
    
    /**
     * Tests attempts to bypass access control.
     *
     * Test that the triggering element does not get set to a button with
     * #access=FALSE.
     */
    public function testAttemptAccessControlBypass() {
        $path = 'form-test/clicked-button';
        $form_html_id = 'form-test-clicked-button';
        // Retrieve a form where 'button1' has #access=FALSE and 'button2' doesn't.
        $this->drupalGet($path . '/rs/s');
        // Submit the form with 'button1=button1' in the POST data, which someone
        // trying to get around security safeguards could easily do. We have to do
        // a little trickery here, to work around the safeguards in submitForm()
        // by renaming the text field and value that is in the form to 'button1',
        // we can get the data we want into \Drupal::request()->request.
        $page = $this->getSession()
            ->getPage();
        $input = $page->find('css', 'input[name="text"]');
        $this->assertNotNull($input, 'text input located.');
        $input->setValue('name', 'button1');
        $input->setValue('value', 'button1');
        $this->xpath('//form[@id="' . $form_html_id . '"]//input[@type="submit"]')[0]
            ->click();
        // Ensure that the triggering element was not set to the restricted button.
        // Do this with both a negative and positive assertion, because negative
        // assertions alone can be brittle. See testNoButtonInfoInPost() for why the
        // triggering element gets set to 'button2'.
        $this->assertSession()
            ->pageTextNotContains('The clicked button is button1.');
        $this->assertSession()
            ->pageTextContains('The clicked button is button2.');
    }

}