<?php
/*
 +--------------------------------------------------------------------+
 | CiviCRM version 4.7                                                |
 +--------------------------------------------------------------------+
 | Copyright CiviCRM LLC (c) 2004-2018                                |
 +--------------------------------------------------------------------+
 | This file is a part of CiviCRM.                                    |
 |                                                                    |
 | CiviCRM is free software; you can copy, modify, and distribute it  |
 | under the terms of the GNU Affero General Public License           |
 | Version 3, 19 November 2007 and the CiviCRM Licensing Exception.   |
 |                                                                    |
 | CiviCRM is distributed in the hope that it will be useful, but     |
 | WITHOUT ANY WARRANTY; without even the implied warranty of         |
 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.               |
 | See the GNU Affero General Public License for more details.        |
 |                                                                    |
 | You should have received a copy of the GNU Affero General Public   |
 | License and the CiviCRM Licensing Exception along                  |
 | with this program; if not, contact CiviCRM LLC                     |
 | at info[AT]civicrm[DOT]org. If you have questions about the        |
 | GNU Affero General Public License or the licensing of CiviCRM,     |
 | see the CiviCRM license FAQ at http://civicrm.org/licensing        |
 +--------------------------------------------------------------------+
 */

/**
 * This class is intended to test ACL permission using the multisite module
 *
 * @package CiviCRM_APIv3
 * @subpackage API_Contact
 * @group headless
 */
class api_v3_ACLPermissionTest extends CiviUnitTestCase {
  protected $_apiversion = 3;
  public $DBResetRequired = FALSE;
  protected $_entity;
  protected $allowedContactId = 0;
  protected $allowedContacts = array();

  public function setUp() {
    parent::setUp();
    $baoObj = new CRM_Core_DAO();
    $baoObj->createTestObject('CRM_Pledge_BAO_Pledge', array(), 1, 0);
    $baoObj->createTestObject('CRM_Core_BAO_Phone', array(), 1, 0);
    $this->prepareForACLs();
  }

  /**
   * (non-PHPdoc)
   * @see CiviUnitTestCase::tearDown()
   */
  public function tearDown() {
    $this->cleanUpAfterACLs();
    $tablesToTruncate = array(
      'civicrm_contact',
      'civicrm_group_contact',
      'civicrm_group',
      'civicrm_acl',
      'civicrm_acl_cache',
      'civicrm_acl_entity_role',
      'civicrm_acl_contact_cache',
      'civicrm_contribution',
      'civicrm_participant',
      'civicrm_uf_match',
      'civicrm_activity',
      'civicrm_activity_contact',
      'civicrm_note',
      'civicrm_entity_tag',
      'civicrm_tag',
    );
    $this->quickCleanup($tablesToTruncate);
  }

  /**
   * Function tests that an empty where hook returns no results.
   */
  public function testContactGetNoResultsHook() {
    $this->hookClass->setHook('civicrm_aclWhereClause', array($this, 'aclWhereHookNoResults'));
    $result = $this->callAPISuccess('contact', 'get', array(
      'check_permissions' => 1,
      'return' => 'display_name',
    ));
    $this->assertEquals(0, $result['count']);
  }

  /**
   * Function tests that an empty where hook returns exactly 1 result with "view my contact".
   *
   * CRM-16512 caused contacts with Edit my contact to be able to view all records.
   */
  public function testContactGetOneResultHookWithViewMyContact() {
    $this->createLoggedInUser();
    $this->hookClass->setHook('civicrm_aclWhereClause', array($this, 'aclWhereHookNoResults'));
    CRM_Core_Config::singleton()->userPermissionClass->permissions = array('access CiviCRM', 'view my contact');
    $result = $this->callAPISuccess('contact', 'get', array(
      'check_permissions' => 1,
      'return' => 'display_name',
    ));
    $this->assertEquals(1, $result['count']);
  }

  /**
   * Function tests that a user with "edit my contact" can edit themselves.
   */
  public function testContactEditHookWithEditMyContact() {
    $cid = $this->createLoggedInUser();
    $this->hookClass->setHook('civicrm_aclWhereClause', array($this, 'aclWhereHookNoResults'));
    CRM_Core_Config::singleton()->userPermissionClass->permissions = array('access CiviCRM', 'edit my contact');
    $this->callAPISuccess('contact', 'create', array(
      'check_permissions' => 1,
      'id' => $cid,
    ));
  }

  /**
   * Ensure contact permissions do not block contact-less location entities.
   */
  public function testAddressWithoutContactIDAccess() {
    $ownID = $this->createLoggedInUser();
    CRM_Core_Config::singleton()->userPermissionClass->permissions = array('access CiviCRM', 'view all contacts');
    $this->callAPISuccess('Address', 'create', array(
      'city' => 'Mouseville',
      'location_type_id' => 'Main',
      'api.LocBlock.create' => 1,
      'contact_id' => $ownID,
    ));
    $this->callAPISuccessGetSingle('Address', array('city' => 'Mouseville', 'check_permissions' => 1));
    CRM_Core_DAO::executeQuery('UPDATE civicrm_address SET contact_id = NULL WHERE contact_id = %1', array(1 => array($ownID, 'Integer')));
    $this->callAPISuccessGetSingle('Address', array('city' => 'Mouseville', 'check_permissions' => 1));
  }

  /**
   * Ensure contact permissions extend to related entities like email
   */
  public function testRelatedEntityPermissions() {
    $this->createLoggedInUser();
    $disallowedContact = $this->individualCreate(array(), 0);
    $this->allowedContactId = $this->individualCreate(array(), 1);
    $this->hookClass->setHook('civicrm_aclWhereClause', array($this, 'aclWhereOnlyOne'));
    CRM_Core_Config::singleton()->userPermissionClass->permissions = array('access CiviCRM');
    $testEntities = array(
      'Email' => array('email' => 'null@nothing', 'location_type_id' => 1),
      'Phone' => array('phone' => '123456', 'location_type_id' => 1),
      'IM' => array('name' => 'hello', 'location_type_id' => 1),
      'Website' => array('url' => 'http://test'),
      'Address' => array('street_address' => '123 Sesame St.', 'location_type_id' => 1),
    );
    foreach ($testEntities as $entity => $params) {
      $params += array(
        'contact_id' => $disallowedContact,
        'check_permissions' => 1,
      );
      // We should be prevented from getting or creating entities for a contact we don't have permission for
      $this->callAPIFailure($entity, 'create', $params);
      $this->callAPISuccess($entity, 'create', array('check_permissions' => 0) + $params);
      $results = $this->callAPISuccess($entity, 'get', array('contact_id' => $disallowedContact, 'check_permissions' => 1));
      $this->assertEquals(0, $results['count']);

      // We should be allowed to create and get for contacts we do have permission on
      $params['contact_id'] = $this->allowedContactId;
      $this->callAPISuccess($entity, 'create', $params);
      $results = $this->callAPISuccess($entity, 'get', array('contact_id' => $this->allowedContactId, 'check_permissions' => 1));
      $this->assertGreaterThan(0, $results['count']);
    }
    $newTag = civicrm_api3('Tag', 'create', array(
      'name' => 'Foo123',
    ));
    $relatedEntities = array(
      'Note' => array('note' => 'abc'),
      'EntityTag' => array('tag_id' => $newTag['id']),
    );
    foreach ($relatedEntities as $entity => $params) {
      $params += array(
        'entity_id' => $disallowedContact,
        'entity_table' => 'civicrm_contact',
        'check_permissions' => 1,
      );
      // We should be prevented from getting or creating entities for a contact we don't have permission for
      $this->callAPIFailure($entity, 'create', $params);
      $this->callAPISuccess($entity, 'create', array('check_permissions' => 0) + $params);
      $results = $this->callAPISuccess($entity, 'get', array('entity_id' => $disallowedContact, 'entity_table' => 'civicrm_contact', 'check_permissions' => 1));
      $this->assertEquals(0, $results['count']);

      // We should be allowed to create and get for entities we do have permission on
      $params['entity_id'] = $this->allowedContactId;
      $this->callAPISuccess($entity, 'create', $params);
      $results = $this->callAPISuccess($entity, 'get', array('entity_id' => $this->allowedContactId, 'entity_table' => 'civicrm_contact', 'check_permissions' => 1));
      $this->assertGreaterThan(0, $results['count']);
    }
  }

  /**
   * Function tests all results are returned.
   */
  public function testContactGetAllResultsHook() {
    $this->hookClass->setHook('civicrm_aclWhereClause', array($this, 'aclWhereHookAllResults'));
    $result = $this->callAPISuccess('contact', 'get', array(
      'check_permissions' => 1,
      'return' => 'display_name',
    ));

    $this->assertEquals(2, $result['count']);
  }

  /**
   * Function tests that deleted contacts are not returned.
   */
  public function testContactGetPermissionHookNoDeleted() {
    $this->callAPISuccess('contact', 'create', array('id' => 2, 'is_deleted' => 1));
    $this->hookClass->setHook('civicrm_aclWhereClause', array($this, 'aclWhereHookAllResults'));
    $result = $this->callAPISuccess('contact', 'get', array(
      'check_permissions' => 1,
      'return' => 'display_name',
    ));
    $this->assertEquals(1, $result['count']);
  }

  /**
   * Test permissions limited by hook.
   */
  public function testContactGetHookLimitingHook() {
    $this->hookClass->setHook('civicrm_aclWhereClause', array($this, 'aclWhereOnlySecond'));

    $result = $this->callAPISuccess('contact', 'get', array(
      'check_permissions' => 1,
      'return' => 'display_name',
    ));
    $this->assertEquals(1, $result['count']);
  }

  /**
   * Confirm that without check permissions we still get 2 contacts returned.
   */
  public function testContactGetHookLimitingHookDontCheck() {
    $result = $this->callAPISuccess('contact', 'get', array(
      'check_permissions' => 0,
      'return' => 'display_name',
    ));
    $this->assertEquals(2, $result['count']);
  }

  /**
   * Check that id works as a filter.
   */
  public function testContactGetIDFilter() {
    $this->hookClass->setHook('civicrm_aclWhereClause', array($this, 'aclWhereHookAllResults'));
    $result = $this->callAPISuccess('contact', 'get', array(
      'sequential' => 1,
      'id' => 2,
      'check_permissions' => 1,
    ));

    $this->assertEquals(1, $result['count']);
    $this->assertEquals(2, $result['id']);
  }

  /**
   * Check that address IS returned.
   */
  public function testContactGetAddressReturned() {
    $this->hookClass->setHook('civicrm_aclWhereClause', array($this, 'aclWhereOnlySecond'));
    $fullresult = $this->callAPISuccess('contact', 'get', array(
      'sequential' => 1,
    ));
    //return doesn't work for all keys - can't fix that here so let's skip ...
    //prefix & suffix are inconsistent due to  CRM-7929
    // unsure about others but return doesn't work on them
    $elementsReturnDoesntSupport = array(
      'prefix',
      'suffix',
      'gender',
      'current_employer',
      'phone_id',
      'phone_type_id',
      'phone',
      'worldregion_id',
      'world_region',
    );
    $expectedReturnElements = array_diff(array_keys($fullresult['values'][0]), $elementsReturnDoesntSupport);
    $result = $this->callAPISuccess('contact', 'get', array(
      'check_permissions' => 1,
      'return' => $expectedReturnElements,
      'sequential' => 1,
    ));
    $this->assertEquals(1, $result['count']);
    foreach ($expectedReturnElements as $element) {
      $this->assertArrayHasKey($element, $result['values'][0]);
    }
  }

  /**
   * Check that pledge IS not returned.
   */
  public function testContactGetPledgeIDNotReturned() {
    $this->hookClass->setHook('civicrm_aclWhereClause', array($this, 'aclWhereHookAllResults'));
    $this->callAPISuccess('contact', 'get', array(
      'sequential' => 1,
    ));
    $result = $this->callAPISuccess('contact', 'get', array(
      'check_permissions' => 1,
      'return' => 'pledge_id',
      'sequential' => 1,
    ));
    $this->assertArrayNotHasKey('pledge_id', $result['values'][0]);
  }

  /**
   * Check that pledge IS not an allowable filter.
   */
  public function testContactGetPledgeIDNotFiltered() {
    $this->hookClass->setHook('civicrm_aclWhereClause', array($this, 'aclWhereHookAllResults'));
    $this->callAPISuccess('contact', 'get', array(
      'sequential' => 1,
    ));
    $result = $this->callAPISuccess('contact', 'get', array(
      'check_permissions' => 1,
      'pledge_id' => 1,
      'sequential' => 1,
    ));
    $this->assertEquals(2, $result['count']);
  }

  /**
   * Check that chaining doesn't bypass permissions
   */
  public function testContactGetPledgeNotChainable() {
    $this->hookClass->setHook('civicrm_aclWhereClause', array($this, 'aclWhereOnlySecond'));
    $this->callAPISuccess('contact', 'get', array(
      'sequential' => 1,
    ));
    $this->callAPIFailure('contact', 'get', array(
        'check_permissions' => 1,
        'api.pledge.get' => 1,
        'sequential' => 1,
      ),
      'Error in call to Pledge_get : API permission check failed for Pledge/get call; insufficient permission: require access CiviCRM and access CiviPledge'
    );
  }

  public function setupCoreACL() {
    $this->createLoggedInUser();
    $this->_permissionedDisabledGroup = $this->groupCreate(array(
      'title' => 'pick-me-disabled',
      'is_active' => 0,
      'name' => 'pick-me-disabled',
    ));
    $this->_permissionedGroup = $this->groupCreate(array(
      'title' => 'pick-me-active',
      'is_active' => 1,
      'name' => 'pick-me-active',
    ));
    $this->setupACL();
  }

  /**
   * @dataProvider entities
   * confirm that without check permissions we still get 2 contacts returned
   * @param $entity
   */
  public function testEntitiesGetHookLimitingHookNoCheck($entity) {
    CRM_Core_Config::singleton()->userPermissionClass->permissions = array();
    $this->setUpEntities($entity);
    $this->hookClass->setHook('civicrm_aclWhereClause', array($this, 'aclWhereHookNoResults'));
    $result = $this->callAPISuccess($entity, 'get', array(
      'check_permissions' => 0,
      'return' => 'contact_id',
    ));
    $this->assertEquals(2, $result['count']);
  }

  /**
   * @dataProvider entities
   * confirm that without check permissions we still get 2 entities returned
   * @param $entity
   */
  public function testEntitiesGetCoreACLLimitingHookNoCheck($entity) {
    $this->setupCoreACL();
    //CRM_Core_Config::singleton()->userPermissionClass->permissions = array();
    $this->setUpEntities($entity);
    $this->hookClass->setHook('civicrm_aclWhereClause', array($this, 'aclWhereHookNoResults'));
    $result = $this->callAPISuccess($entity, 'get', array(
      'check_permissions' => 0,
      'return' => 'contact_id',
    ));
    $this->assertEquals(2, $result['count']);
  }

  /**
   * @dataProvider entities
   * confirm that with check permissions we don't get entities
   * @param $entity
   * @throws \PHPUnit_Framework_IncompleteTestError
   */
  public function testEntitiesGetCoreACLLimitingCheck($entity) {
    $this->setupCoreACL();
    $this->setUpEntities($entity);
    $result = $this->callAPISuccess($entity, 'get', array(
      'check_permissions' => 1,
      'return' => 'contact_id',
    ));
    $this->assertEquals(0, $result['count']);
  }

  /**
   * @dataProvider entities
   * Function tests that an empty where hook returns no results
   * @param string $entity
   * @throws \PHPUnit_Framework_IncompleteTestError
   */
  public function testEntityGetNoResultsHook($entity) {
    $this->markTestIncomplete('hook acls only work with contacts so far');
    CRM_Core_Config::singleton()->userPermissionClass->permissions = array();
    $this->setUpEntities($entity);
    $this->hookClass->setHook('civicrm_aclWhereClause', array($this, 'aclWhereHookNoResults'));
    $result = $this->callAPISuccess($entity, 'get', array(
      'check_permission' => 1,
    ));
    $this->assertEquals(0, $result['count']);
  }

  /**
   * @return array
   */
  public static function entities() {
    return array(array('contribution'), array('participant'));// @todo array('pledge' => 'pledge')
  }

  /**
   * Create 2 entities
   * @param $entity
   */
  public function setUpEntities($entity) {
    $baoObj = new CRM_Core_DAO();
    $baoObj->createTestObject(_civicrm_api3_get_BAO($entity), array(), 2, 0);
    CRM_Core_Config::singleton()->userPermissionClass->permissions = array(
      'access CiviCRM',
      'access CiviContribute',
      'access CiviEvent',
      'view event participants',
    );
  }

  /**
   * All results returned.
   *
   * @implements CRM_Utils_Hook::aclWhereClause
   *
   * @param string $type
   * @param array $tables
   * @param array $whereTables
   * @param int $contactID
   * @param string $where
   */
  public function aclWhereHookAllResults($type, &$tables, &$whereTables, &$contactID, &$where) {
    $where = " (1) ";
  }

  /**
   * All but first results returned.
   * @implements CRM_Utils_Hook::aclWhereClause
   * @param $type
   * @param $tables
   * @param $whereTables
   * @param $contactID
   * @param $where
   */
  public function aclWhereOnlySecond($type, &$tables, &$whereTables, &$contactID, &$where) {
    $where = " contact_a.id > 1";
  }

  /**
   * Only specified contact returned.
   * @implements CRM_Utils_Hook::aclWhereClause
   * @param $type
   * @param $tables
   * @param $whereTables
   * @param $contactID
   * @param $where
   */
  public function aclWhereOnlyOne($type, &$tables, &$whereTables, &$contactID, &$where) {
    $where = " contact_a.id = " . $this->allowedContactId;
  }

  /**
   * Basic check that an unpermissioned call keeps working and permissioned call fails.
   */
  public function testGetActivityNoPermissions() {
    $this->setPermissions(array());
    $this->callAPISuccess('Activity', 'get', array());
    $this->callAPIFailure('Activity', 'get', array('check_permissions' => 1));
  }

  /**
   * View all activities is enough regardless of contact ACLs.
   */
  public function testGetActivityViewAllActivitiesEnoughWithOrWithoutID() {
    $activity = $this->activityCreate();
    $this->setPermissions(array('view all activities', 'access CiviCRM'));
    $this->callAPISuccess('Activity', 'getsingle', array('check_permissions' => 1, 'id' => $activity['id']));
    $this->callAPISuccess('Activity', 'getsingle', array('check_permissions' => 1));
  }

  /**
   * View all activities is required unless id is passed in.
   */
  public function testGetActivityViewAllContactsEnoughWIthoutID() {
    $this->setPermissions(array('view all contacts', 'access CiviCRM'));
    $this->callAPISuccess('Activity', 'get', array('check_permissions' => 1));
  }

  /**
   * View all activities is required unless id is passed in, in which case ACLs are used.
   */
  public function testGetActivityViewAllContactsEnoughWIthID() {
    $activity = $this->activityCreate();
    $this->setPermissions(array('view all contacts', 'access CiviCRM'));
    $this->callAPISuccess('Activity', 'getsingle', array('check_permissions' => 1, 'id' => $activity['id']));
  }

  /**
   * View all activities is required unless id is passed in, in which case ACLs are used.
   */
  public function testGetActivityAccessCiviCRMNotEnough() {
    $activity = $this->activityCreate();
    $this->setPermissions(array('access CiviCRM'));
    $this->callAPIFailure('Activity', 'getsingle', array('check_permissions' => 1, 'id' => $activity['id']));
  }

  /**
   * Check that activities can be retrieved by ACL.
   *
   * The activities api applies ACLs in a very limited circumstance, if id is passed in.
   * Otherwise it sticks with the blunt original permissions.
   */
  public function testGetActivityByACL() {
    $this->setPermissions(array('access CiviCRM'));
    $activity = $this->activityCreate();

    $this->hookClass->setHook('civicrm_aclWhereClause', array($this, 'aclWhereHookAllResults'));
    $this->callAPISuccess('Activity', 'getsingle', array('check_permissions' => 1, 'id' => $activity['id']));
  }

  /**
   * To leverage ACL permission to view an activity you must be able to see all of the contacts.
   */
  public function testGetActivityByAclCannotViewAllContacts() {
    $activity = $this->activityCreate();
    $contacts = $this->getActivityContacts($activity);
    $this->setPermissions(array('access CiviCRM'));

    foreach ($contacts as $contact_id) {
      $this->allowedContactId = $contact_id;
      $this->hookClass->setHook('civicrm_aclWhereClause', array($this, 'aclWhereOnlyOne'));
      $this->callAPIFailure('Activity', 'getsingle', array('check_permissions' => 1, 'id' => $activity['id']));
    }
  }

  /**
   * Check that if the source contact is deleted but we can view the others we can see the activity.
   *
   * CRM-18409.
   *
   * @throws \CRM_Core_Exception
   */
  public function testGetActivityACLSourceContactDeleted() {
    $this->setPermissions(array('access CiviCRM', 'delete contacts'));
    $activity = $this->activityCreate();
    $contacts = $this->getActivityContacts($activity);

    $this->hookClass->setHook('civicrm_aclWhereClause', array($this, 'aclWhereHookAllResults'));
    $this->contactDelete($contacts['source_contact_id']);
    $this->callAPISuccess('Activity', 'getsingle', array('check_permissions' => 1, 'id' => $activity['id']));
  }

  /**
   * Test get activities multiple ids with check permissions
   * CRM-20441
   */
  public function testActivitiesGetMultipleIdsCheckPermissions() {
    $this->createLoggedInUser();
    $activity = $this->activityCreate();
    $activity2 = $this->activityCreate();
    $this->setPermissions(array('access CiviCRM'));
    $this->hookClass->setHook('civicrm_aclWhereClause', array($this, 'aclWhereHookAllResults'));
    // Get activities associated with contact $this->_contactID.
    $params = array(
      'id' => array('IN' => array($activity['id'], $activity2['id'])),
      'check_permissions' => TRUE,
    );
    $result = $this->callAPISuccess('activity', 'get', $params);
    $this->assertEquals(2, $result['count']);
  }

  /**
   * Test get activities multiple ids with check permissions
   * Limit access to One contact
   * CRM-20441
   */
  public function testActivitiesGetMultipleIdsCheckPermissionsLimitedACL() {
    $this->createLoggedInUser();
    $activity = $this->activityCreate();
    $contacts = $this->getActivityContacts($activity);
    $this->setPermissions(array('access CiviCRM'));
    foreach ($contacts as $contact_id) {
      $this->allowedContacts[] = $contact_id;
    }
    $this->hookClass->setHook('civicrm_aclWhereClause', array($this, 'aclWhereMultipleContacts'));
    $contact2 = $this->individualCreate();
    $activity2 = $this->activityCreate(array('source_contact_id' => $contact2));
    // Get activities associated with contact $this->_contactID.
    $params = array(
      'id' => array('IN' => array($activity['id'])),
      'check_permissions' => TRUE,
    );
    $result = $this->callAPISuccess('activity', 'get', $params);
    $this->assertEquals(1, $result['count']);
    $this->callAPIFailure('activity', 'get', array_merge($params, array('id' => array('IN', array($activity2['id'])))));
  }

  /**
   * Test get activities multiple ids with check permissions
   * CRM-20441
   */
  public function testActivitiesGetMultipleIdsCheckPermissionsNotIN() {
    $this->createLoggedInUser();
    $activity = $this->activityCreate();
    $activity2 = $this->activityCreate();
    $this->setPermissions(array('access CiviCRM'));
    $this->hookClass->setHook('civicrm_aclWhereClause', array($this, 'aclWhereHookAllResults'));
    // Get activities associated with contact $this->_contactID.
    $params = array(
      'id' => array('NOT IN' => array($activity['id'], $activity2['id'])),
      'check_permissions' => TRUE,
    );
    $result = $this->callAPISuccess('activity', 'get', $params);
    $this->assertEquals(0, $result['count']);
  }

  /**
   * Get the contacts for the activity.
   *
   * @param $activity
   *
   * @return array
   * @throws \CRM_Core_Exception
   */
  protected function getActivityContacts($activity) {
    $contacts = array();

    $activityContacts = $this->callAPISuccess('ActivityContact', 'get', array(
        'activity_id' => $activity['id'],
      )
    );

    $activityRecordTypes = $this->callAPISuccess('ActivityContact', 'getoptions', array('field' => 'record_type_id'));
    foreach ($activityContacts['values'] as $activityContact) {
      $type = $activityRecordTypes['values'][$activityContact['record_type_id']];
      switch ($type) {
        case 'Activity Source':
          $contacts['source_contact_id'] = $activityContact['contact_id'];
          break;

        case 'Activity Targets':
          $contacts['target_contact_id'] = $activityContact['contact_id'];
          break;

        case 'Activity Assignees':
          $contacts['assignee_contact_id'] = $activityContact['contact_id'];
          break;

      }
    }
    return $contacts;
  }

}