abstract class AccessResult in Zircon Profile 8

Value object for passing an access result with cacheability metadata.

The access result itself — excluding the cacheability metadata — is immutable. There are subclasses for each of the three possible access results themselves:

When using ::orIf() and ::andIf(), cacheability metadata will be merged accordingly as well.

Hierarchy

• class \Drupal\Core\Access\AccessResult implements AccessResultInterface, RefinableCacheableDependencyInterface uses RefinableCacheableDependencyTrait

See also

\Drupal\Core\Access\AccessResultAllowed

\Drupal\Core\Access\AccessResultForbidden

\Drupal\Core\Access\AccessResultNeutral

123 files declare their use of AccessResult

AccessAwareRouterTest.php in core/tests/Drupal/Tests/Core/Routing/AccessAwareRouterTest.php

Contains \Drupal\Tests\Core\Routing\AccessAwareRouterTest.

AccessCheck.php in core/modules/system/tests/modules/menu_test/src/Access/AccessCheck.php

Contains \Drupal\menu_test\Access\AccessCheck.

AccessManagerTest.php in core/tests/Drupal/Tests/Core/Access/AccessManagerTest.php

Contains \Drupal\Tests\Core\Access\AccessManagerTest.

AccessResultTest.php in core/tests/Drupal/Tests/Core/Access/AccessResultTest.php

Contains \Drupal\Tests\Core\Access\AccessResultTest.

AggregatorFeedBlock.php in core/modules/aggregator/src/Plugin/Block/AggregatorFeedBlock.php

Contains \Drupal\aggregator\Plugin\Block\AggregatorFeedBlock.

... See full list

File

core/lib/Drupal/Core/Access/AccessResult.php, line 31

Contains \Drupal\Core\Access\AccessResult.

Namespace

Drupal\Core\Access

abstract class AccessResult implements AccessResultInterface, RefinableCacheableDependencyInterface {
  use RefinableCacheableDependencyTrait;

  /**
   * Creates an AccessResultInterface object with isNeutral() === TRUE.
   *
   * @return \Drupal\Core\Access\AccessResult
   *   isNeutral() will be TRUE.
   */
  public static function neutral() {
    return new AccessResultNeutral();
  }

  /**
   * Creates an AccessResultInterface object with isAllowed() === TRUE.
   *
   * @return \Drupal\Core\Access\AccessResult
   *   isAllowed() will be TRUE.
   */
  public static function allowed() {
    return new AccessResultAllowed();
  }

  /**
   * Creates an AccessResultInterface object with isForbidden() === TRUE.
   *
   * @return \Drupal\Core\Access\AccessResult
   *   isForbidden() will be TRUE.
   */
  public static function forbidden() {
    return new AccessResultForbidden();
  }

  /**
   * Creates an allowed or neutral access result.
   *
   * @param bool $condition
   *   The condition to evaluate.
   *
   * @return \Drupal\Core\Access\AccessResult
   *   If $condition is TRUE, isAllowed() will be TRUE, otherwise isNeutral()
   *   will be TRUE.
   */
  public static function allowedIf($condition) {
    return $condition ? static::allowed() : static::neutral();
  }

  /**
   * Creates a forbidden or neutral access result.
   *
   * @param bool $condition
   *   The condition to evaluate.
   *
   * @return \Drupal\Core\Access\AccessResult
   *   If $condition is TRUE, isForbidden() will be TRUE, otherwise isNeutral()
   *   will be TRUE.
   */
  public static function forbiddenIf($condition) {
    return $condition ? static::forbidden() : static::neutral();
  }

  /**
   * Creates an allowed access result if the permission is present, neutral otherwise.
   *
   * Checks the permission and adds a 'user.permissions' cache context.
   *
   * @param \Drupal\Core\Session\AccountInterface $account
   *   The account for which to check a permission.
   * @param string $permission
   *   The permission to check for.
   *
   * @return \Drupal\Core\Access\AccessResult
   *   If the account has the permission, isAllowed() will be TRUE, otherwise
   *   isNeutral() will be TRUE.
   */
  public static function allowedIfHasPermission(AccountInterface $account, $permission) {
    return static::allowedIf($account
      ->hasPermission($permission))
      ->addCacheContexts([
      'user.permissions',
    ]);
  }

  /**
   * Creates an allowed access result if the permissions are present, neutral otherwise.
   *
   * Checks the permission and adds a 'user.permissions' cache contexts.
   *
   * @param \Drupal\Core\Session\AccountInterface $account
   *   The account for which to check permissions.
   * @param array $permissions
   *   The permissions to check.
   * @param string $conjunction
   *   (optional) 'AND' if all permissions are required, 'OR' in case just one.
   *   Defaults to 'AND'
   *
   * @return \Drupal\Core\Access\AccessResult
   *   If the account has the permissions, isAllowed() will be TRUE, otherwise
   *   isNeutral() will be TRUE.
   */
  public static function allowedIfHasPermissions(AccountInterface $account, array $permissions, $conjunction = 'AND') {
    $access = FALSE;
    if ($conjunction == 'AND' && !empty($permissions)) {
      $access = TRUE;
      foreach ($permissions as $permission) {
        if (!($permission_access = $account
          ->hasPermission($permission))) {
          $access = FALSE;
          break;
        }
      }
    }
    else {
      foreach ($permissions as $permission) {
        if ($permission_access = $account
          ->hasPermission($permission)) {
          $access = TRUE;
          break;
        }
      }
    }
    return static::allowedIf($access)
      ->addCacheContexts(empty($permissions) ? [] : [
      'user.permissions',
    ]);
  }

  /**
   * {@inheritdoc}
   *
   * @see \Drupal\Core\Access\AccessResultAllowed
   */
  public function isAllowed() {
    return FALSE;
  }

  /**
   * {@inheritdoc}
   *
   * @see \Drupal\Core\Access\AccessResultForbidden
   */
  public function isForbidden() {
    return FALSE;
  }

  /**
   * {@inheritdoc}
   *
   * @see \Drupal\Core\Access\AccessResultNeutral
   */
  public function isNeutral() {
    return FALSE;
  }

  /**
   * {@inheritdoc}
   */
  public function getCacheContexts() {
    return $this->cacheContexts;
  }

  /**
   * {@inheritdoc}
   */
  public function getCacheTags() {
    return $this->cacheTags;
  }

  /**
   * {@inheritdoc}
   */
  public function getCacheMaxAge() {
    return $this->cacheMaxAge;
  }

  /**
   * Resets cache contexts (to the empty array).
   *
   * @return $this
   */
  public function resetCacheContexts() {
    $this->cacheContexts = [];
    return $this;
  }

  /**
   * Resets cache tags (to the empty array).
   *
   * @return $this
   */
  public function resetCacheTags() {
    $this->cacheTags = [];
    return $this;
  }

  /**
   * Sets the maximum age for which this access result may be cached.
   *
   * @param int $max_age
   *   The maximum time in seconds that this access result may be cached.
   *
   * @return $this
   */
  public function setCacheMaxAge($max_age) {
    $this->cacheMaxAge = $max_age;
    return $this;
  }

  /**
   * Convenience method, adds the "user.permissions" cache context.
   *
   * @return $this
   */
  public function cachePerPermissions() {
    $this
      ->addCacheContexts(array(
      'user.permissions',
    ));
    return $this;
  }

  /**
   * Convenience method, adds the "user" cache context.
   *
   * @return $this
   */
  public function cachePerUser() {
    $this
      ->addCacheContexts(array(
      'user',
    ));
    return $this;
  }

  /**
   * Convenience method, adds the entity's cache tag.
   *
   * @param \Drupal\Core\Entity\EntityInterface $entity
   *   The entity whose cache tag to set on the access result.
   *
   * @return $this
   *
   * @deprecated in Drupal 8.0.x-dev, will be removed before Drupal 9.0.0. Use
   *   ::addCacheableDependency() instead.
   */
  public function cacheUntilEntityChanges(EntityInterface $entity) {
    return $this
      ->addCacheableDependency($entity);
  }

  /**
   * Convenience method, adds the configuration object's cache tag.
   *
   * @param \Drupal\Core\Config\ConfigBase $configuration
   *   The configuration object whose cache tag to set on the access result.
   *
   * @return $this
   *
   * @deprecated in Drupal 8.0.x-dev, will be removed before Drupal 9.0.0. Use
   *   ::addCacheableDependency() instead.
   */
  public function cacheUntilConfigurationChanges(ConfigBase $configuration) {
    return $this
      ->addCacheableDependency($configuration);
  }

  /**
   * {@inheritdoc}
   */
  public function orIf(AccessResultInterface $other) {
    $merge_other = FALSE;

    // $other's cacheability metadata is merged if $merge_other gets set to TRUE
    // and this happens in three cases:
    // 1. $other's access result is the one that determines the combined access
    //    result.
    // 2. This access result is not cacheable and $other's access result is the
    //    same. i.e. attempt to return a cacheable access result.
    // 3. Neither access result is 'forbidden' and both are cacheable: inherit
    //    the other's cacheability metadata because it may turn into a
    //    'forbidden' for another value of the cache contexts in the
    //    cacheability metadata. In other words: this is necessary to respect
    //    the contagious nature of the 'forbidden' access result.
    //    e.g. we have two access results A and B. Neither is forbidden. A is
    //    globally cacheable (no cache contexts). B is cacheable per role. If we
    //    don't have merging case 3, then A->orIf(B) will be globally cacheable,
    //    which means that even if a user of a different role logs in, the
    //    cached access result will be used, even though for that other role, B
    //    is forbidden!
    if ($this
      ->isForbidden() || $other
      ->isForbidden()) {
      $result = static::forbidden();
      if (!$this
        ->isForbidden() || $this
        ->getCacheMaxAge() === 0 && $other
        ->isForbidden()) {
        $merge_other = TRUE;
      }
    }
    elseif ($this
      ->isAllowed() || $other
      ->isAllowed()) {
      $result = static::allowed();
      if (!$this
        ->isAllowed() || $this
        ->getCacheMaxAge() === 0 && $other
        ->isAllowed() || $this
        ->getCacheMaxAge() !== 0 && $other instanceof CacheableDependencyInterface && $other
        ->getCacheMaxAge() !== 0) {
        $merge_other = TRUE;
      }
    }
    else {
      $result = static::neutral();
      if (!$this
        ->isNeutral() || $this
        ->getCacheMaxAge() === 0 && $other
        ->isNeutral() || $this
        ->getCacheMaxAge() !== 0 && $other instanceof CacheableDependencyInterface && $other
        ->getCacheMaxAge() !== 0) {
        $merge_other = TRUE;
      }
    }
    $result
      ->inheritCacheability($this);
    if ($merge_other) {
      $result
        ->inheritCacheability($other);
    }
    return $result;
  }

  /**
   * {@inheritdoc}
   */
  public function andIf(AccessResultInterface $other) {

    // The other access result's cacheability metadata is merged if $merge_other
    // gets set to TRUE. It gets set to TRUE in one case: if the other access
    // result is used.
    $merge_other = FALSE;
    if ($this
      ->isForbidden() || $other
      ->isForbidden()) {
      $result = static::forbidden();
      if (!$this
        ->isForbidden()) {
        $merge_other = TRUE;
      }
    }
    elseif ($this
      ->isAllowed() && $other
      ->isAllowed()) {
      $result = static::allowed();
      $merge_other = TRUE;
    }
    else {
      $result = static::neutral();
      if (!$this
        ->isNeutral()) {
        $merge_other = TRUE;
      }
    }
    $result
      ->inheritCacheability($this);
    if ($merge_other) {
      $result
        ->inheritCacheability($other);

      // If this access result is not cacheable, then an AND with another access
      // result must also not be cacheable, except if the other access result
      // has isForbidden() === TRUE. isForbidden() access results are contagious
      // in that they propagate regardless of the other value.
      if ($this
        ->getCacheMaxAge() === 0 && !$result
        ->isForbidden()) {
        $result
          ->setCacheMaxAge(0);
      }
    }
    return $result;
  }

  /**
   * Inherits the cacheability of the other access result, if any.
   *
   * inheritCacheability() differs from addCacheableDependency() in how it
   * handles max-age, because it is designed to inherit the cacheability of the
   * second operand in the andIf() and orIf() operations. There, the situation
   * "allowed, max-age=0 OR allowed, max-age=1000" needs to yield max-age 1000
   * as the end result.
   *
   * @param \Drupal\Core\Access\AccessResultInterface $other
   *   The other access result, whose cacheability (if any) to inherit.
   *
   * @return $this
   */
  public function inheritCacheability(AccessResultInterface $other) {
    $this
      ->addCacheableDependency($other);
    if ($other instanceof CacheableDependencyInterface) {
      if ($this
        ->getCacheMaxAge() !== 0 && $other
        ->getCacheMaxAge() !== 0) {
        $this
          ->setCacheMaxAge(Cache::mergeMaxAges($this
          ->getCacheMaxAge(), $other
          ->getCacheMaxAge()));
      }
      else {
        $this
          ->setCacheMaxAge($other
          ->getCacheMaxAge());
      }
    }
    return $this;
  }

}

Members

Name	Modifiers	Type	Description	Overrides
AccessResult::allowed	public static	function	Creates an AccessResultInterface object with isAllowed() === TRUE.
AccessResult::allowedIf	public static	function	Creates an allowed or neutral access result.
AccessResult::allowedIfHasPermission	public static	function	Creates an allowed access result if the permission is present, neutral otherwise.
AccessResult::allowedIfHasPermissions	public static	function	Creates an allowed access result if the permissions are present, neutral otherwise.
AccessResult::andIf	public	function	Combine this access result with another using AND. Overrides AccessResultInterface::andIf
AccessResult::cachePerPermissions	public	function	Convenience method, adds the "user.permissions" cache context.
AccessResult::cachePerUser	public	function	Convenience method, adds the "user" cache context.
AccessResult::cacheUntilConfigurationChanges Deprecated	public	function	Convenience method, adds the configuration object's cache tag.
AccessResult::cacheUntilEntityChanges Deprecated	public	function	Convenience method, adds the entity's cache tag.
AccessResult::forbidden	public static	function	Creates an AccessResultInterface object with isForbidden() === TRUE.
AccessResult::forbiddenIf	public static	function	Creates a forbidden or neutral access result.
AccessResult::getCacheContexts	public	function	The cache contexts associated with this object. Overrides RefinableCacheableDependencyTrait::getCacheContexts
AccessResult::getCacheMaxAge	public	function	The maximum age for which this object may be cached. Overrides RefinableCacheableDependencyTrait::getCacheMaxAge
AccessResult::getCacheTags	public	function	The cache tags associated with this object. Overrides RefinableCacheableDependencyTrait::getCacheTags
AccessResult::inheritCacheability	public	function	Inherits the cacheability of the other access result, if any.
AccessResult::isAllowed	public	function	Overrides AccessResultInterface::isAllowed	1
AccessResult::isForbidden	public	function	Overrides AccessResultInterface::isForbidden	1
AccessResult::isNeutral	public	function	Overrides AccessResultInterface::isNeutral	1
AccessResult::neutral	public static	function	Creates an AccessResultInterface object with isNeutral() === TRUE.
AccessResult::orIf	public	function	Combine this access result with another using OR. Overrides AccessResultInterface::orIf
AccessResult::resetCacheContexts	public	function	Resets cache contexts (to the empty array).
AccessResult::resetCacheTags	public	function	Resets cache tags (to the empty array).
AccessResult::setCacheMaxAge	public	function	Sets the maximum age for which this access result may be cached.
RefinableCacheableDependencyTrait::$cacheContexts	protected	property	Cache contexts.
RefinableCacheableDependencyTrait::$cacheMaxAge	protected	property	Cache max-age.
RefinableCacheableDependencyTrait::$cacheTags	protected	property	Cache tags.
RefinableCacheableDependencyTrait::addCacheableDependency	public	function		1
RefinableCacheableDependencyTrait::addCacheContexts	public	function
RefinableCacheableDependencyTrait::addCacheTags	public	function
RefinableCacheableDependencyTrait::mergeCacheMaxAge	public	function