class FormsFormStorageTestCase

class FormsFormStorageTestCase extends BackdropWebTestCase {
  protected $profile = 'testing';

  /**
   * @var User
   */
  protected $web_user;

  function setUp() {
    parent::setUp('form_test');

    $this->web_user = $this->backdropCreateUser();
    $this->backdropLogin($this->web_user);
  }

  /**
   * Tests using the form in a usual way.
   */
  function testForm() {
    $this->backdropGet('form_test/form-storage');
    $this->assertText('Form constructions: 1');

    $edit = array('title' => 'new', 'value' => 'value_is_set');

    // Use form rebuilding triggered by a submit button.
    $this->backdropPost(NULL, $edit, 'Continue submit');
    $this->assertText('Form constructions: 2');
    $this->assertText('Form constructions: 3');

    // Reset the form to the values of the storage, using a form rebuild
    // triggered by button of type button.
    $this->backdropPost(NULL, array('title' => 'changed'), 'Reset');
    $this->assertFieldByName('title', 'new', 'Values have been reset.');
    // After rebuilding, the form has been cached.
    $this->assertText('Form constructions: 4');

    $this->backdropPost(NULL, $edit, 'Save');
    $this->assertText('Form constructions: 4');
    $this->assertText('Title: new', 'The form storage has stored the values.');
  }

  /**
   * Tests using the form with an activated $form_state['cache'] property.
   */
  function testFormCached() {
    $this->backdropGet('form_test/form-storage', array('query' => array('cache' => 1)));
    $this->assertText('Form constructions: 1');

    $edit = array('title' => 'new', 'value' => 'value_is_set');

    // Use form rebuilding triggered by a submit button.
    $this->backdropPost(NULL, $edit, 'Continue submit');
    $this->assertText('Form constructions: 2');

    // Reset the form to the values of the storage, using a form rebuild
    // triggered by button of type button.
    $this->backdropPost(NULL, array('title' => 'changed'), 'Reset');
    $this->assertFieldByName('title', 'new', 'Values have been reset.');
    $this->assertText('Form constructions: 3');

    $this->backdropPost(NULL, $edit, 'Save');
    $this->assertText('Form constructions: 3');
    $this->assertText('Title: new', 'The form storage has stored the values.');
  }

  /**
   * Tests validation when form storage is used.
   */
  function testValidation() {
    $this->backdropPost('form_test/form-storage', array('title' => '', 'value' => 'value_is_set'), 'Continue submit');
    $this->assertPattern('/value_is_set/', 'The input values have been kept.');
  }

  /**
   * Tests updating cached form storage during form validation.
   *
   * If form caching is enabled and a form stores data in the form storage, then
   * the form storage also has to be updated in case of a validation error in
   * the form. This test re-uses the existing form for multi-step tests, but
   * triggers a special #element_validate handler to update the form storage
   * during form validation, while another, required element in the form
   * triggers a form validation error.
   */
  function testCachedFormStorageValidation() {
    // Request the form with 'cache' query parameter to enable form caching.
    $this->backdropGet('form_test/form-storage', array('query' => array('cache' => 1)));

    // Skip step 1 of the multi-step form, since the first step copies over
    // 'title' into form storage, but we want to verify that changes in the form
    // storage are updated in the cache during form validation.
    $edit = array('title' => 'foo');
    $this->backdropPost(NULL, $edit, 'Continue submit');

    // In step 2, trigger a validation error for the required 'title' field, and
    // post the special 'change_title' value for the 'value' field, which
    // conditionally invokes the #element_validate handler to update the form
    // storage.
    $edit = array('title' => '', 'value' => 'change_title');
    $this->backdropPost(NULL, $edit, 'Save');

    // At this point, the form storage should contain updated values, but we do
    // not see them, because the form has not been rebuilt yet due to the
    // validation error. Post again and verify that the rebuilt form contains
    // the values of the updated form storage.
    $this->backdropPost(NULL, array('title' => 'foo', 'value' => 'bar'), 'Save');
    $this->assertText("The thing has been changed.", 'The altered form storage value was updated in cache and taken over.');
  }

  /**
   * Tests a form using form state without using 'storage' to pass data from the
   * constructor to a submit handler. The data has to persist even when caching
   * gets activated, what may happen when a modules alter the form and adds
   * #ajax properties.
   */
  function testFormStatePersist() {
    // Test the form one time with caching activated and one time without.
    $run_options = array(
      array(),
      array('query' => array('cache' => 1)),
    );
    foreach ($run_options as $options) {
      $this->backdropPost('form-test/state-persist', array(), t('Submit'), $options);
      // The submit handler outputs the value in $form_state, assert it's there.
      $this->assertText('State persisted.');

      // Test it again, but first trigger a validation error, then test.
      $this->backdropPost('form-test/state-persist', array('title' => ''), t('Submit'), $options);
      $this->assertText(t('!name field is required.', array('!name' => 'title')));
      // Submit the form again triggering no validation error.
      $this->backdropPost(NULL, array('title' => 'foo'), t('Submit'), $options);
      $this->assertText('State persisted.');

      // Now post to the rebuilt form and verify it's still there afterwards.
      $this->backdropPost(NULL, array('title' => 'bar'), t('Submit'), $options);
      $this->assertText('State persisted.');
    }
  }

  /**
   * Verify that the form build-id remains the same when validation errors
   * occur on a mutable form.
   */
  function testMutableForm() {
    // Request the form with 'cache' query parameter to enable form caching.
    $this->backdropGet('form_test/form-storage', array('query' => array('cache' => 1)));
    $buildIdFields = $this->xpath('//input[@name="form_build_id"]');
    $this->assertEqual(count($buildIdFields), 1, 'One form build id field on the page');
    $buildId = (string) $buildIdFields[0]['value'];

    // Trigger validation error by submitting an empty title.
    $edit = array('title' => '');
    $this->backdropPost(NULL, $edit, 'Continue submit');

    // Verify that the build-id did not change.
    $this->assertFieldByName('form_build_id', $buildId, 'Build id remains the same when form validation fails');
  }

  /**
   * Verifies that form build-id is regenerated when loading an immutable form
   * from the cache.
   */
  function testImmutableForm() {
    // Request the form with 'cache' query parameter to enable form caching.
    $this->backdropGet('form_test/form-storage', array('query' => array('cache' => 1, 'immutable' => 1)));
    $buildIdFields = $this->xpath('//input[@name="form_build_id"]');
    $this->assertEqual(count($buildIdFields), 1, 'One form build id field on the page');
    $buildId = (string) $buildIdFields[0]['value'];

    // Trigger validation error by submitting an empty title.
    $edit = array('title' => '');
    $this->backdropPost(NULL, $edit, 'Continue submit');

    // Verify that the build-id did change.
    $this->assertNoFieldByName('form_build_id', $buildId, 'Build id changes when form validation fails');

    // Retrieve the new build-id.
    $buildIdFields = $this->xpath('//input[@name="form_build_id"]');
    $this->assertEqual(count($buildIdFields), 1, 'One form build id field on the page');
    $buildId = (string) $buildIdFields[0]['value'];

    // Trigger validation error by again submitting an empty title.
    $edit = array('title' => '');
    $this->backdropPost(NULL, $edit, 'Continue submit');

    // Verify that the build-id does not change the second time.
    $this->assertFieldByName('form_build_id', $buildId, 'Build id remains the same when form validation fails subsequently');
  }

  /**
   * Verify that existing contrib code cannot overwrite immutable form state.
   */
  public function testImmutableFormLegacyProtection() {
    module_enable(array('dblog'));

    $this->backdropGet('form_test/form-storage', array('query' => array('cache' => 1, 'immutable' => 1)));
    $build_id_fields = $this->xpath('//input[@name="form_build_id"]');
    $this->assertEqual(count($build_id_fields), 1, 'One form build id field on the page');
    $build_id = (string) $build_id_fields[0]['value'];

    // Try to poison the form cache.
    $original = $this->backdropGetAJAX('form_test/form-storage-legacy/' . $build_id);
    $this->assertEqual($original['form']['#build_id_old'], $build_id, 'Original build_id was recorded');
    $this->assertNotEqual($original['form']['#build_id'], $build_id, 'New build_id was generated');

    // Assert that a watchdog message was logged by form_set_cache.
    $status = (bool) db_query_range('SELECT 1 FROM {watchdog} WHERE message = :message', 0, 1, array(':message' => 'Form build-id mismatch detected while attempting to store a form in the cache.'));
    $this->assert($status, 'A watchdog message was logged by form_set_cache');

    // Ensure that the form state was not poisoned by the preceding call.
    $original = $this->backdropGetAJAX('form_test/form-storage-legacy/' . $build_id);
    $this->assertEqual($original['form']['#build_id_old'], $build_id, 'Original build_id was recorded');
    $this->assertNotEqual($original['form']['#build_id'], $build_id, 'New build_id was generated');
    $this->assert(empty($original['form']['#poisoned']), 'Original form structure was preserved');
    $this->assert(empty($original['form_state']['poisoned']), 'Original form state was preserved');
  }
}