pageowner.php

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<?php
use Elgg\Router\Route;

function elgg_get_page_owner_guid($guid = 0) {
    static $page_owner_guid;

    if ($guid === false || $guid === null) {
        $page_owner_guid = 0;
        return $page_owner_guid;
    }
    
    if ($guid) {
        $page_owner_guid = (int) $guid;
    }

    if (isset($page_owner_guid)) {
        return $page_owner_guid;
    }

    $route = _elgg_services()->request->getRoute();
    if ($route instanceof Route) {
        $page_owner = $route->resolvePageOwner();
        if ($page_owner) {
            $page_owner_guid = $page_owner->guid;
            return $page_owner_guid;
        }
    }

    // return guid of page owner entity
    // Note: core registers default_page_owner_handler() to handle this hook.
    $guid = (int) elgg_trigger_plugin_hook('page_owner', 'system', null, 0);

    if ($guid) {
        $page_owner_guid = $guid;
    }

    return $guid;
}

function elgg_get_page_owner_entity() {
    $guid = elgg_get_page_owner_guid();
    if (!$guid) {
        return false;
    }

    return get_entity($guid);
}

function elgg_set_page_owner_guid($guid) {
    elgg_get_page_owner_guid($guid);
}

function default_page_owner_handler($hook, $entity_type, $returnvalue, $params) {

    if ($returnvalue) {
        return $returnvalue;
    }

    $ia = elgg_set_ignore_access(true);

    $username = get_input("username");
    if ($user = get_user_by_username($username)) {
        elgg_set_ignore_access($ia);
        return $user->getGUID();
    }

    $owner = get_input("owner_guid");
    if ($owner) {
        if ($user = get_entity($owner)) {
            elgg_set_ignore_access($ia);
            return $user->getGUID();
        }
    }

    // @todo feels hacky
    $segments = _elgg_services()->request->getUrlSegments();
    if (isset($segments[1]) && isset($segments[2])) {
        switch ($segments[1]) {
            case 'owner':
            case 'friends':
                $user = get_user_by_username($segments[2]);
                if ($user) {
                    elgg_set_ignore_access($ia);
                    return $user->getGUID();
                }
                break;
            case 'view':
            case 'edit':
                $entity = get_entity($segments[2]);
                if ($entity) {
                    elgg_set_ignore_access($ia);
                    return $entity->getContainerGUID();
                }
                break;
            case 'add':
            case 'group':
                $entity = get_entity($segments[2]);
                if ($entity) {
                    elgg_set_ignore_access($ia);
                    return $entity->getGUID();
                }
                break;
        }
    }

    elgg_set_ignore_access($ia);
}

function elgg_set_context($context) {
    return _elgg_services()->request->getContextStack()->set($context);
}

function elgg_get_context() {
    return _elgg_services()->request->getContextStack()->peek();
}

function elgg_push_context($context) {
    _elgg_services()->request->getContextStack()->push($context);
}

function elgg_pop_context() {
    return _elgg_services()->request->getContextStack()->pop();
}

function elgg_in_context($context) {
    return _elgg_services()->request->getContextStack()->contains($context);
}

function elgg_get_context_stack() {
    return _elgg_services()->request->getContextStack()->toArray();
}

function elgg_set_context_stack(array $stack) {
    _elgg_services()->request->getContextStack()->fromArray($stack);
}

function _elgg_pageowner_init() {
    elgg_register_plugin_hook_handler('page_owner', 'system', 'default_page_owner_handler');
}

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