class FileFieldWidgetTestCase

class FileFieldWidgetTestCase extends FileFieldTestCase {
  public static function getInfo() {
    return array(
      'name' => 'File field widget test',
      'description' => 'Tests the file field widget, single and multi-valued, with and without AJAX, with public and private files.',
      'group' => 'File',
    );
  }

  /**
   * Tests upload and remove buttons for a single-valued File field.
   */
  function testSingleValuedWidget() {

    // Use 'page' instead of 'article', so that the 'article' image field does
    // not conflict with this test. If in the future the 'page' type gets its
    // own default file or image field, this test can be made more robust by
    // using a custom node type.
    $type_name = 'page';
    $field_name = strtolower($this
      ->randomName());
    $this
      ->createFileField($field_name, $type_name);
    $field = field_info_field($field_name);
    $instance = field_info_instance('node', $field_name, $type_name);
    $test_file = $this
      ->getTestFile('text');
    foreach (array(
      'nojs',
      'js',
    ) as $type) {

      // Create a new node with the uploaded file and ensure it got uploaded
      // successfully.
      // @todo This only tests a 'nojs' submission, because drupalPostAJAX()
      //   does not yet support file uploads.
      $nid = $this
        ->uploadNodeFile($test_file, $field_name, $type_name);
      $node = node_load($nid, NULL, TRUE);
      $node_file = (object) $node->{$field_name}[LANGUAGE_NONE][0];
      $this
        ->assertFileExists($node_file, 'New file saved to disk on node creation.');

      // Test that running field_attach_update() leaves the file intact.
      $field = new stdClass();
      $field->type = $type_name;
      $field->nid = $nid;
      field_attach_update('node', $field);
      $node = node_load($nid);
      $node_file = (object) $node->{$field_name}[LANGUAGE_NONE][0];
      $this
        ->assertFileExists($node_file, 'New file still saved to disk on field update.');

      // Ensure the file can be downloaded.
      $this
        ->drupalGet(file_create_url($node_file->uri));
      $this
        ->assertResponse(200, 'Confirmed that the generated URL is correct by downloading the shipped file.');

      // Ensure the edit page has a remove button instead of an upload button.
      $this
        ->drupalGet("node/{$nid}/edit");
      $this
        ->assertNoFieldByXPath('//input[@type="submit"]', t('Upload'), 'Node with file does not display the "Upload" button.');
      $this
        ->assertFieldByXpath('//input[@type="submit"]', t('Remove'), 'Node with file displays the "Remove" button.');

      // "Click" the remove button (emulating either a nojs or js submission).
      switch ($type) {
        case 'nojs':
          $this
            ->drupalPost(NULL, array(), t('Remove'));
          break;
        case 'js':
          $button = $this
            ->xpath('//input[@type="submit" and @value="' . t('Remove') . '"]');
          $this
            ->drupalPostAJAX(NULL, array(), array(
            (string) $button[0]['name'] => (string) $button[0]['value'],
          ));
          break;
      }

      // Ensure the page now has an upload button instead of a remove button.
      $this
        ->assertNoFieldByXPath('//input[@type="submit"]', t('Remove'), 'After clicking the "Remove" button, it is no longer displayed.');
      $this
        ->assertFieldByXpath('//input[@type="submit"]', t('Upload'), 'After clicking the "Remove" button, the "Upload" button is displayed.');

      // Save the node and ensure it does not have the file.
      $this
        ->drupalPost(NULL, array(), t('Save'));
      $node = node_load($nid, NULL, TRUE);
      $this
        ->assertTrue(empty($node->{$field_name}[LANGUAGE_NONE][0]['fid']), 'File was successfully removed from the node.');
    }
  }

  /**
   * Tests exploiting the temporary file removal of another user using fid.
   */
  function testTemporaryFileRemovalExploit() {

    // Create a victim user.
    $victim_user = $this
      ->drupalCreateUser();

    // Create an attacker user.
    $attacker_user = $this
      ->drupalCreateUser(array(
      'access content',
      'create page content',
      'edit any page content',
    ));

    // Log in as the attacker user.
    $this
      ->drupalLogin($attacker_user);

    // Perform tests using the newly created users.
    $this
      ->doTestTemporaryFileRemovalExploit($victim_user->uid, $attacker_user->uid);
  }

  /**
   * Tests exploiting the temporary file removal for anonymous users using fid.
   */
  public function testTemporaryFileRemovalExploitAnonymous() {

    // Set up an anonymous victim user.
    $victim_uid = 0;

    // Set up an anonymous attacker user.
    $attacker_uid = 0;

    // Set up permissions for anonymous attacker user.
    user_role_change_permissions(DRUPAL_ANONYMOUS_RID, array(
      'access content' => TRUE,
      'create page content' => TRUE,
      'edit any page content' => TRUE,
    ));

    // In order to simulate being the anonymous attacker user, we need to log
    // out here since setUp() has logged in the admin.
    $this
      ->drupalLogout();

    // Perform tests using the newly set up users.
    $this
      ->doTestTemporaryFileRemovalExploit($victim_uid, $attacker_uid);
  }

  /**
   * Tests validation with the Upload button.
   */
  function testWidgetValidation() {
    $type_name = 'article';
    $field_name = strtolower($this
      ->randomName());
    $this
      ->createFileField($field_name, $type_name);
    $this
      ->updateFileField($field_name, $type_name, array(
      'file_extensions' => 'txt',
    ));
    foreach (array(
      'nojs',
      'js',
    ) as $type) {

      // Create node and prepare files for upload.
      $node = $this
        ->drupalCreateNode(array(
        'type' => 'article',
      ));
      $nid = $node->nid;
      $this
        ->drupalGet("node/{$nid}/edit");
      $test_file_text = $this
        ->getTestFile('text');
      $test_file_image = $this
        ->getTestFile('image');
      $field = field_info_field($field_name);
      $name = 'files[' . $field_name . '_' . LANGUAGE_NONE . '_0]';

      // Upload file with incorrect extension, check for validation error.
      $edit[$name] = drupal_realpath($test_file_image->uri);
      switch ($type) {
        case 'nojs':
          $this
            ->drupalPost(NULL, $edit, t('Upload'));
          break;
        case 'js':
          $button = $this
            ->xpath('//input[@type="submit" and @value="' . t('Upload') . '"]');
          $this
            ->drupalPostAJAX(NULL, $edit, array(
            (string) $button[0]['name'] => (string) $button[0]['value'],
          ));
          break;
      }
      $error_message = t('Only files with the following extensions are allowed: %files-allowed.', array(
        '%files-allowed' => 'txt',
      ));
      $this
        ->assertRaw($error_message, t('Validation error when file with wrong extension uploaded (JSMode=%type).', array(
        '%type' => $type,
      )));

      // Upload file with correct extension, check that error message is removed.
      $edit[$name] = drupal_realpath($test_file_text->uri);
      switch ($type) {
        case 'nojs':
          $this
            ->drupalPost(NULL, $edit, t('Upload'));
          break;
        case 'js':
          $button = $this
            ->xpath('//input[@type="submit" and @value="' . t('Upload') . '"]');
          $this
            ->drupalPostAJAX(NULL, $edit, array(
            (string) $button[0]['name'] => (string) $button[0]['value'],
          ));
          break;
      }
      $this
        ->assertNoRaw($error_message, t('Validation error removed when file with correct extension uploaded (JSMode=%type).', array(
        '%type' => $type,
      )));
    }
  }

  /**
   * Helper for testing exploiting the temporary file removal using fid.
   *
   * @param int $victim_uid
   *   The victim user ID.
   * @param int $attacker_uid
   *   The attacker user ID.
   */
  protected function doTestTemporaryFileRemovalExploit($victim_uid, $attacker_uid) {

    // Use 'page' instead of 'article', so that the 'article' image field does
    // not conflict with this test. If in the future the 'page' type gets its
    // own default file or image field, this test can be made more robust by
    // using a custom node type.
    $type_name = 'page';
    $field_name = 'test_file_field';
    $this
      ->createFileField($field_name, $type_name);
    $test_file = $this
      ->getTestFile('text');
    foreach (array(
      'nojs',
      'js',
    ) as $type) {

      // Create a temporary file owned by the anonymous victim user. This will be
      // as if they had uploaded the file, but not saved the node they were
      // editing or creating.
      $victim_tmp_file = $this
        ->createTemporaryFile('some text', $victim_uid);
      $victim_tmp_file = file_load($victim_tmp_file->fid);
      $this
        ->assertTrue($victim_tmp_file->status != FILE_STATUS_PERMANENT, 'New file saved to disk is temporary.');
      $this
        ->assertFalse(empty($victim_tmp_file->fid), 'New file has a fid');
      $this
        ->assertEqual($victim_uid, $victim_tmp_file->uid, 'New file belongs to the victim user');

      // Have attacker create a new node with a different uploaded file and
      // ensure it got uploaded successfully.
      // @todo Can we test AJAX? See https://www.drupal.org/node/2538260
      $edit = array(
        'title' => $type . '-title',
      );

      // Attach a file to a node.
      $langcode = LANGUAGE_NONE;
      $edit['files[' . $field_name . '_' . $langcode . '_0]'] = drupal_realpath($test_file->uri);
      $this
        ->drupalPost("node/add/{$type_name}", $edit, 'Save');
      $node = $this
        ->drupalGetNodeByTitle($edit['title']);
      $node_file = file_load($node->{$field_name}[$langcode][0]['fid']);
      $this
        ->assertFileExists($node_file, 'New file saved to disk on node creation.');
      $this
        ->assertEqual($attacker_uid, $node_file->uid, 'New file belongs to the attacker.');

      // Ensure the file can be downloaded.
      $this
        ->drupalGet(file_create_url($node_file->uri));
      $this
        ->assertResponse(200, 'Confirmed that the generated URL is correct by downloading the shipped file.');

      // "Click" the remove button (emulating either a nojs or js submission).
      // In this POST request, the attacker "guesses" the fid of the victim's
      // temporary file and uses that to remove this file.
      $this
        ->drupalGet('node/' . $node->nid . '/edit');
      switch ($type) {
        case 'nojs':
          $this
            ->drupalPost(NULL, array(
            "{$field_name}[{$langcode}][0][fid]" => (string) $victim_tmp_file->fid,
          ), 'Remove');
          break;
        case 'js':
          $button = $this
            ->xpath('//input[@type="submit" and @value="Remove"]');
          $this
            ->drupalPostAJAX(NULL, array(
            "{$field_name}[{$langcode}][0][fid]" => (string) $victim_tmp_file->fid,
          ), array(
            (string) $button[0]['name'] => (string) $button[0]['value'],
          ));
          break;
      }

      // The victim's temporary file should not be removed by the attacker's
      // POST request.
      $this
        ->assertFileExists($victim_tmp_file);
    }
  }

  /**
   * Tests upload and remove buttons for multiple multi-valued File fields.
   */
  function testMultiValuedWidget() {

    // Use 'page' instead of 'article', so that the 'article' image field does
    // not conflict with this test. If in the future the 'page' type gets its
    // own default file or image field, this test can be made more robust by
    // using a custom node type.
    $type_name = 'page';
    $field_name = strtolower($this
      ->randomName());
    $field_name2 = strtolower($this
      ->randomName());
    $this
      ->createFileField($field_name, $type_name, array(
      'cardinality' => 3,
    ));
    $this
      ->createFileField($field_name2, $type_name, array(
      'cardinality' => 3,
    ));
    $field = field_info_field($field_name);
    $instance = field_info_instance('node', $field_name, $type_name);
    $field2 = field_info_field($field_name2);
    $instance2 = field_info_instance('node', $field_name2, $type_name);
    $test_file = $this
      ->getTestFile('text');
    foreach (array(
      'nojs',
      'js',
    ) as $type) {

      // Visit the node creation form, and upload 3 files for each field. Since
      // the field has cardinality of 3, ensure the "Upload" button is displayed
      // until after the 3rd file, and after that, isn't displayed. Because
      // SimpleTest triggers the last button with a given name, so upload to the
      // second field first.
      // @todo This is only testing a non-Ajax upload, because drupalPostAJAX()
      //   does not yet emulate jQuery's file upload.
      //
      $this
        ->drupalGet("node/add/{$type_name}");
      foreach (array(
        $field_name2,
        $field_name,
      ) as $each_field_name) {
        for ($delta = 0; $delta < 3; $delta++) {
          $edit = array(
            'files[' . $each_field_name . '_' . LANGUAGE_NONE . '_' . $delta . ']' => drupal_realpath($test_file->uri),
          );

          // If the Upload button doesn't exist, drupalPost() will automatically
          // fail with an assertion message.
          $this
            ->drupalPost(NULL, $edit, t('Upload'));
        }
      }
      $this
        ->assertNoFieldByXpath('//input[@type="submit"]', t('Upload'), 'After uploading 3 files for each field, the "Upload" button is no longer displayed.');
      $num_expected_remove_buttons = 6;
      foreach (array(
        $field_name,
        $field_name2,
      ) as $current_field_name) {

        // How many uploaded files for the current field are remaining.
        $remaining = 3;

        // Test clicking each "Remove" button. For extra robustness, test them out
        // of sequential order. They are 0-indexed, and get renumbered after each
        // iteration, so array(1, 1, 0) means:
        // - First remove the 2nd file.
        // - Then remove what is then the 2nd file (was originally the 3rd file).
        // - Then remove the first file.
        foreach (array(
          1,
          1,
          0,
        ) as $delta) {

          // Ensure we have the expected number of Remove buttons, and that they
          // are numbered sequentially.
          $buttons = $this
            ->xpath('//input[@type="submit" and @value="Remove"]');
          $this
            ->assertTrue(is_array($buttons) && count($buttons) === $num_expected_remove_buttons, format_string('There are %n "Remove" buttons displayed (JSMode=%type).', array(
            '%n' => $num_expected_remove_buttons,
            '%type' => $type,
          )));
          foreach ($buttons as $i => $button) {
            $key = $i >= $remaining ? $i - $remaining : $i;
            $check_field_name = $field_name2;
            if ($current_field_name == $field_name && $i < $remaining) {
              $check_field_name = $field_name;
            }
            $this
              ->assertIdentical((string) $button['name'], $check_field_name . '_' . LANGUAGE_NONE . '_' . $key . '_remove_button');
          }

          // "Click" the remove button (emulating either a nojs or js submission).
          $button_name = $current_field_name . '_' . LANGUAGE_NONE . '_' . $delta . '_remove_button';
          switch ($type) {
            case 'nojs':

              // drupalPost() takes a $submit parameter that is the value of the
              // button whose click we want to emulate. Since we have multiple
              // buttons with the value "Remove", and want to control which one we
              // use, we change the value of the other ones to something else.
              // Since non-clicked buttons aren't included in the submitted POST
              // data, and since drupalPost() will result in $this being updated
              // with a newly rebuilt form, this doesn't cause problems.
              foreach ($buttons as $button) {
                if ($button['name'] != $button_name) {
                  $button['value'] = 'DUMMY';
                }
              }
              $this
                ->drupalPost(NULL, array(), t('Remove'));
              break;
            case 'js':

              // drupalPostAJAX() lets us target the button precisely, so we don't
              // require the workaround used above for nojs.
              $this
                ->drupalPostAJAX(NULL, array(), array(
                $button_name => t('Remove'),
              ));
              break;
          }
          $num_expected_remove_buttons--;
          $remaining--;

          // Ensure an "Upload" button for the current field is displayed with the
          // correct name.
          $upload_button_name = $current_field_name . '_' . LANGUAGE_NONE . '_' . $remaining . '_upload_button';
          $buttons = $this
            ->xpath('//input[@type="submit" and @value="Upload" and @name=:name]', array(
            ':name' => $upload_button_name,
          ));
          $this
            ->assertTrue(is_array($buttons) && count($buttons) == 1, format_string('The upload button is displayed with the correct name (JSMode=%type).', array(
            '%type' => $type,
          )));

          // Ensure only at most one button per field is displayed.
          $buttons = $this
            ->xpath('//input[@type="submit" and @value="Upload"]');
          $expected = $current_field_name == $field_name ? 1 : 2;
          $this
            ->assertTrue(is_array($buttons) && count($buttons) == $expected, format_string('After removing a file, only one "Upload" button for each possible field is displayed (JSMode=%type).', array(
            '%type' => $type,
          )));
        }
      }

      // Ensure the page now has no Remove buttons.
      $this
        ->assertNoFieldByXPath('//input[@type="submit"]', t('Remove'), format_string('After removing all files, there is no "Remove" button displayed (JSMode=%type).', array(
        '%type' => $type,
      )));

      // Save the node and ensure it does not have any files.
      $this
        ->drupalPost(NULL, array(
        'title' => $this
          ->randomName(),
      ), t('Save'));
      $matches = array();
      preg_match('/node\\/([0-9]+)/', $this
        ->getUrl(), $matches);
      $nid = $matches[1];
      $node = node_load($nid, NULL, TRUE);
      $this
        ->assertTrue(empty($node->{$field_name}[LANGUAGE_NONE][0]['fid']), 'Node was successfully saved without any files.');
    }
  }

  /**
   * Tests a file field with a "Private files" upload destination setting.
   */
  function testPrivateFileSetting() {

    // Use 'page' instead of 'article', so that the 'article' image field does
    // not conflict with this test. If in the future the 'page' type gets its
    // own default file or image field, this test can be made more robust by
    // using a custom node type.
    $type_name = 'page';
    $field_name = strtolower($this
      ->randomName());
    $this
      ->createFileField($field_name, $type_name);
    $field = field_info_field($field_name);
    $instance = field_info_instance('node', $field_name, $type_name);
    $test_file = $this
      ->getTestFile('text');

    // Change the field setting to make its files private, and upload a file.
    $edit = array(
      'field[settings][uri_scheme]' => 'private',
    );
    $this
      ->drupalPost("admin/structure/types/manage/{$type_name}/fields/{$field_name}", $edit, t('Save settings'));
    $nid = $this
      ->uploadNodeFile($test_file, $field_name, $type_name);
    $node = node_load($nid, NULL, TRUE);
    $node_file = (object) $node->{$field_name}[LANGUAGE_NONE][0];
    $this
      ->assertFileExists($node_file, 'New file saved to disk on node creation.');

    // Ensure the private file is available to the user who uploaded it.
    $this
      ->drupalGet(file_create_url($node_file->uri));
    $this
      ->assertResponse(200, 'Confirmed that the generated URL is correct by downloading the shipped file.');

    // Ensure we can't change 'uri_scheme' field settings while there are some
    // entities with uploaded files.
    $this
      ->drupalGet("admin/structure/types/manage/{$type_name}/fields/{$field_name}");
    $this
      ->assertFieldByXpath('//input[@id="edit-field-settings-uri-scheme-public" and @disabled="disabled"]', 'public', 'Upload destination setting disabled.');

    // Delete node and confirm that setting could be changed.
    node_delete($nid);
    $this
      ->drupalGet("admin/structure/types/manage/{$type_name}/fields/{$field_name}");
    $this
      ->assertFieldByXpath('//input[@id="edit-field-settings-uri-scheme-public" and not(@disabled)]', 'public', 'Upload destination setting enabled.');
  }

  /**
   * Tests that download restrictions on private files work on comments.
   */
  function testPrivateFileComment() {
    $user = $this
      ->drupalCreateUser(array(
      'access comments',
    ));

    // Remove access comments permission from anon user.
    $edit = array(
      DRUPAL_ANONYMOUS_RID . '[access comments]' => FALSE,
    );
    $this
      ->drupalPost('admin/people/permissions', $edit, t('Save permissions'));

    // Create a new field.
    $edit = array(
      'fields[_add_new_field][label]' => $label = $this
        ->randomName(),
      'fields[_add_new_field][field_name]' => $name = strtolower($this
        ->randomName()),
      'fields[_add_new_field][type]' => 'file',
      'fields[_add_new_field][widget_type]' => 'file_generic',
    );
    $this
      ->drupalPost('admin/structure/types/manage/article/comment/fields', $edit, t('Save'));
    $edit = array(
      'field[settings][uri_scheme]' => 'private',
    );
    $this
      ->drupalPost(NULL, $edit, t('Save field settings'));
    $this
      ->drupalPost(NULL, array(), t('Save settings'));

    // Create node.
    $text_file = $this
      ->getTestFile('text');
    $edit = array(
      'title' => $this
        ->randomName(),
    );
    $this
      ->drupalPost('node/add/article', $edit, t('Save'));
    $node = $this
      ->drupalGetNodeByTitle($edit['title']);

    // Add a comment with a file.
    $text_file = $this
      ->getTestFile('text');
    $edit = array(
      'files[field_' . $name . '_' . LANGUAGE_NONE . '_' . 0 . ']' => drupal_realpath($text_file->uri),
      'comment_body[' . LANGUAGE_NONE . '][0][value]' => $comment_body = $this
        ->randomName(),
    );
    $this
      ->drupalPost(NULL, $edit, t('Save'));

    // Get the comment ID.
    preg_match('/comment-([0-9]+)/', $this
      ->getUrl(), $matches);
    $cid = $matches[1];

    // Log in as normal user.
    $this
      ->drupalLogin($user);
    $comment = comment_load($cid);
    $comment_file = (object) $comment->{'field_' . $name}[LANGUAGE_NONE][0];
    $this
      ->assertFileExists($comment_file, 'New file saved to disk on node creation.');

    // Test authenticated file download.
    $url = file_create_url($comment_file->uri);
    $this
      ->assertNotEqual($url, NULL, 'Confirmed that the URL is valid');
    $this
      ->drupalGet(file_create_url($comment_file->uri));
    $this
      ->assertResponse(200, 'Confirmed that the generated URL is correct by downloading the shipped file.');

    // Test anonymous file download.
    $this
      ->drupalLogout();
    $this
      ->drupalGet(file_create_url($comment_file->uri));
    $this
      ->assertResponse(403, 'Confirmed that access is denied for the file without the needed permission.');

    // Unpublishes node.
    $this
      ->drupalLogin($this->admin_user);
    $edit = array(
      'status' => FALSE,
    );
    $this
      ->drupalPost('node/' . $node->nid . '/edit', $edit, t('Save'));

    // Ensures normal user can no longer download the file.
    $this
      ->drupalLogin($user);
    $this
      ->drupalGet(file_create_url($comment_file->uri));
    $this
      ->assertResponse(403, 'Confirmed that access is denied for the file without the needed permission.');
  }

}