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<?php
namespace Drupal\system\Tests\Form;
use Drupal\simpletest\WebTestBase;
/**
* Tests a multistep form using form storage and makes sure validation and
* caching works right.
*
* The tested form puts data into the storage during the initial form
* construction. These tests verify that there are no duplicate form
* constructions, with and without manual form caching activated. Furthermore
* when a validation error occurs, it makes sure that changed form element
* values are not lost due to a wrong form rebuild.
*
* @group Form
*/
class StorageTest extends WebTestBase {
/**
* Modules to enable.
*
* @var array
*/
public static $modules = ['form_test', 'dblog'];
protected function setUp() {
parent::setUp();
$this->drupalLogin ($this->drupalCreateUser());
}
/**
* Tests using the form in a usual way.
*/
public function testForm() {
$this->drupalGet('form_test/form-storage');
$this->assertText('Form constructions: 1');
$edit = ['title' => 'new', 'value' => 'value_is_set'];
// Use form rebuilding triggered by a submit button.
$this->drupalPostForm(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->drupalPostForm(NULL, ['title' => 'changed'], 'Reset');
$this->assertFieldByName('title', 'new', 'Values have been reset.');
// After rebuilding, the form has been cached.
$this->assertText('Form constructions: 4');
$this->drupalPostForm(NULL, $edit, 'Save');
$this->assertText('Form constructions: 4');
$this->assertText('Title: new', 'The form storage has stored the values.');
}
/**
* Tests using the form after calling $form_state->setCached().
*/
public function testFormCached() {
$this->drupalGet('form_test/form-storage', ['query' => ['cache' => 1]]);
$this->assertText('Form constructions: 1');
$edit = ['title' => 'new', 'value' => 'value_is_set'];
// Use form rebuilding triggered by a submit button.
$this->drupalPostForm(NULL, $edit, 'Continue submit');
// The first one is for the building of the form.
$this->assertText('Form constructions: 2');
// The second one is for the rebuilding of the form.
$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->drupalPostForm(NULL, ['title' => 'changed'], 'Reset');
$this->assertFieldByName('title', 'new', 'Values have been reset.');
$this->assertText('Form constructions: 4');
$this->drupalPostForm(NULL, $edit, 'Save');
$this->assertText('Form constructions: 4');
$this->assertText('Title: new', 'The form storage has stored the values.');
}
/**
* Tests validation when form storage is used.
*/
public function testValidation() {
$this->drupalPostForm('form_test/form-storage', ['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.
*/
public function testCachedFormStorageValidation() {
// Request the form with 'cache' query parameter to enable form caching.
$this->drupalGet('form_test/form-storage', ['query' => ['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 = ['title' => 'foo'];
$this->drupalPostForm(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 = ['title' => '', 'value' => 'change_title'];
$this->drupalPostForm(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->drupalPostForm(NULL, ['title' => 'foo', 'value' => 'bar'], 'Save');
$this->assertText("The thing has been changed.", 'The altered form storage value was updated in cache and taken over.');
}
/**
* Verifies that form build-id is regenerated when loading an immutable form
* from the cache.
*/
public function testImmutableForm() {
// Request the form with 'cache' query parameter to enable form caching.
$this->drupalGet('form_test/form-storage', ['query' => ['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 = ['title' => ''];
$this->drupalPostForm(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 = ['title' => ''];
$this->drupalPostForm(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() {
$this->drupalGet('form_test/form-storage', ['query' => ['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->drupalGetAjax('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
// \Drupal::formBuilder()->setCache().
$status = (bool) db_query_range('SELECT 1 FROM {watchdog} WHERE message = :message', 0, 1, [':message' => 'Form build-id mismatch detected while attempting to store a form in the cache.']);
$this->assert($status, 'A watchdog message was logged by \Drupal::formBuilder()->setCache');
// Ensure that the form state was not poisoned by the preceding call.
$original = $this->drupalGetAjax('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');
}
}