class Role

class Role extends ConfigEntityBase implements RoleInterface {
    
    /**
     * The machine name of this role.
     *
     * @var string
     */
    protected $id;
    
    /**
     * The human-readable label of this role.
     *
     * @var string
     */
    protected $label;
    
    /**
     * The weight of this role in administrative listings.
     *
     * @var int
     */
    protected $weight;
    
    /**
     * The permissions belonging to this role.
     *
     * @var array
     */
    protected $permissions = [];
    
    /**
     * An indicator whether the role has all permissions.
     *
     * @var bool
     */
    protected $is_admin;
    
    /**
     * {@inheritdoc}
     */
    public function getPermissions() {
        if ($this->isAdmin()) {
            return [];
        }
        return $this->permissions;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getWeight() {
        return $this->get('weight');
    }
    
    /**
     * {@inheritdoc}
     */
    public function setWeight($weight) {
        $this->set('weight', $weight);
        return $this;
    }
    
    /**
     * {@inheritdoc}
     */
    public function hasPermission($permission) {
        if ($this->isAdmin()) {
            return TRUE;
        }
        return in_array($permission, $this->permissions);
    }
    
    /**
     * {@inheritdoc}
     */
    public function grantPermission($permission) {
        if ($this->isAdmin()) {
            return $this;
        }
        if (!$this->hasPermission($permission)) {
            $this->permissions[] = $permission;
        }
        return $this;
    }
    
    /**
     * {@inheritdoc}
     */
    public function revokePermission($permission) {
        if ($this->isAdmin()) {
            return $this;
        }
        $this->permissions = array_diff($this->permissions, [
            $permission,
        ]);
        return $this;
    }
    
    /**
     * {@inheritdoc}
     */
    public function isAdmin() {
        return (bool) $this->is_admin;
    }
    
    /**
     * {@inheritdoc}
     */
    public function setIsAdmin($is_admin) {
        $this->is_admin = $is_admin;
        return $this;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function postLoad(EntityStorageInterface $storage, array &$entities) {
        parent::postLoad($storage, $entities);
        // Sort the queried roles by their weight.
        // See \Drupal\Core\Config\Entity\ConfigEntityBase::sort().
        uasort($entities, [
            static::class,
            'sort',
        ]);
    }
    
    /**
     * {@inheritdoc}
     */
    public function preSave(EntityStorageInterface $storage) {
        parent::preSave($storage);
        if (!isset($this->weight) && ($roles = $storage->loadMultiple())) {
            // Set a role weight to make this new role last.
            $max = array_reduce($roles, function ($max, $role) {
                return $max > $role->weight ? $max : $role->weight;
            });
            $this->weight = $max + 1;
        }
        if (!$this->isSyncing() && $this->hasTrustedData()) {
            // Permissions are always ordered alphabetically to avoid conflicts in the
            // exported configuration. If the save is not trusted then the
            // configuration will be sorted by StorableConfigBase.
            sort($this->permissions);
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function calculateDependencies() {
        parent::calculateDependencies();
        // Load all permission definitions.
        $permission_definitions = \Drupal::service('user.permissions')->getPermissions();
        $valid_permissions = array_intersect($this->permissions, array_keys($permission_definitions));
        $invalid_permissions = array_diff($this->permissions, $valid_permissions);
        if (!empty($invalid_permissions)) {
            throw new \RuntimeException('Adding non-existent permissions to a role is not allowed. The incorrect permissions are "' . implode('", "', $invalid_permissions) . '".');
        }
        foreach ($valid_permissions as $permission) {
            // Depend on the module that is providing this permissions.
            $this->addDependency('module', $permission_definitions[$permission]['provider']);
            // Depend on any other dependencies defined by permissions granted to
            // this role.
            if (!empty($permission_definitions[$permission]['dependencies'])) {
                $this->addDependencies($permission_definitions[$permission]['dependencies']);
            }
        }
        return $this;
    }
    
    /**
     * {@inheritdoc}
     */
    public function onDependencyRemoval(array $dependencies) {
        $changed = parent::onDependencyRemoval($dependencies);
        // Load all permission definitions.
        $permission_definitions = \Drupal::service('user.permissions')->getPermissions();
        // Convert config and content entity dependencies to a list of names to make
        // it easier to check.
        foreach ([
            'content',
            'config',
        ] as $type) {
            $dependencies[$type] = array_keys($dependencies[$type]);
        }
        // Remove any permissions from the role that are dependent on anything being
        // deleted or uninstalled.
        foreach ($this->permissions as $key => $permission) {
            if (!isset($permission_definitions[$permission])) {
                // If the permission is not defined then there's nothing we can do.
                continue;
            }
            if (in_array($permission_definitions[$permission]['provider'], $dependencies['module'], TRUE)) {
                unset($this->permissions[$key]);
                $changed = TRUE;
                // Process the next permission.
                continue;
            }
            if (isset($permission_definitions[$permission]['dependencies'])) {
                foreach ($permission_definitions[$permission]['dependencies'] as $type => $list) {
                    if (array_intersect($list, $dependencies[$type])) {
                        unset($this->permissions[$key]);
                        $changed = TRUE;
                        // Process the next permission.
                        continue 2;
                    }
                }
            }
        }
        return $changed;
    }

}