group.php

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<?php
function elgg_group_tool_gatekeeper($option, $group_guid = null) {
    $group_guid = $group_guid ?: elgg_get_page_owner_guid();
    
    $group = get_entity($group_guid);
    if (!$group instanceof \ElggGroup) {
        return;
    }
    
    if ($group->isToolEnabled($option)) {
        return;
    }

    $ex = new \Elgg\Http\Exception\GroupToolGatekeeperException();
    $ex->setRedirectUrl($group->getURL());
    $ex->setParams([
        'entity' => $group,
        'tool' => $option,
    ]);

    throw $ex;
}

function _elgg_groups_container_override($hook, $type, $result, $params) {
    $container = $params['container'];
    $user = $params['user'];

    if ($container instanceof ElggGroup && $user) {
        /* @var \ElggGroup $container */
        if ($container->isMember($user)) {
            return true;
        }
    }

    return $result;
}

function _elgg_groups_test($hook, $type, $value) {
    $value[] = ElggCoreGroupTest::class;
    return $value;
}

function _elgg_groups_init() {
    elgg_register_plugin_hook_handler('container_permissions_check', 'all', '_elgg_groups_container_override');
    elgg_register_plugin_hook_handler('unit_test', 'system', '_elgg_groups_test');
}

return function(\Elgg\EventsService $events, \Elgg\HooksRegistrationService $hooks) {
    $events->registerHandler('init', 'system', '_elgg_groups_init');
};