AccessWhereClause.php

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<?php

namespace Elgg\Database\Clauses;

use Elgg\Database\QueryBuilder;

class AccessWhereClause extends WhereClause {

    public $access_column = 'access_id';
    public $owner_guid_column = 'owner_guid';

    public $guid_column = 'guid';

    public $enabled_column = 'enabled';

    public $ignore_access;

    public $use_enabled_clause;

    public $viewer_guid;

    public function prepare(QueryBuilder $qb, $table_alias = null) {

        $alias = function ($column) use ($table_alias) {
            return $table_alias ? "{$table_alias}.{$column}" : $column;
        };

        if (!isset($this->viewer_guid)) {
            $this->viewer_guid = _elgg_services()->session->getLoggedInUserGuid();
        }

        if (!isset($this->ignore_access)) {
            $this->ignore_access = _elgg_services()->userCapabilities->canBypassPermissionsCheck($this->viewer_guid);
        }

        if (!isset($this->use_enabled_clause)) {
            $this->use_enabled_clause = !_elgg_services()->session->getDisabledEntityVisibility();
        }

        $ors = [];
        $ands = [];

        $ands[] = parent::prepare($qb, $table_alias);

        if (!$this->ignore_access) {
            if ($this->viewer_guid) {
                // include user's content
                $ors['owner_access'] = $qb->compare($alias($this->owner_guid_column), '=', $this->viewer_guid, ELGG_VALUE_INTEGER);
            }

            // include standard accesses (public, logged in, access collections)
            $access_list = _elgg_services()->accessCollections->getAccessArray($this->viewer_guid);
            $ors['acl_access'] = $qb->compare($alias($this->access_column), '=', $access_list, ELGG_VALUE_INTEGER);
        }

        if ($this->use_enabled_clause) {
            $ands[] = $qb->compare($alias($this->enabled_column), '=', 'yes', ELGG_VALUE_STRING);
        }

        $hook_params = [
            'table_alias' => $table_alias,
            'user_guid' => $this->viewer_guid,
            'ignore_access' => $this->ignore_access,
            'use_enabled_clause' => $this->use_enabled_clause,
            'access_column' => $this->access_column,
            'owner_guid_column' => $this->owner_guid_column,
            'guid_column' => $this->guid_column,
            'enabled_column' => $this->enabled_column,
            'query_builder' => $qb,
        ];

        $clauses = _elgg_services()->hooks->trigger('get_sql', 'access', $hook_params, [
            'ors' => $ors,
            'ands' => $ands,
        ]);

        $ors = array_filter($clauses['ors']);
        $ands = array_filter($clauses['ands']);

        if (!empty($ors)) {
            $ands[] = $qb->merge($ors, 'OR');
        }

        return $qb->merge($ands);
    }

}