pageowner.php

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<?php
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;
    }

    // return guid of page owner entity
    $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 > 0) {
        $ia = elgg_set_ignore_access(true);
        $owner = get_entity($guid);
        elgg_set_ignore_access($ia);

        return $owner;
    }

    return false;
}

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);

    $username = get_input("username");
    if ($username) {
        // @todo using a username of group:<guid> is deprecated
        if (substr_count($username, 'group:')) {
            preg_match('/group\:([0-9]+)/i', $username, $matches);
            $guid = $matches[1];
            if ($entity = get_entity($guid)) {
                elgg_set_ignore_access($ia);
                return $entity->getGUID();
            }
        }

        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();
        }
    }

    // ignore root and query
    $uri = current_page_url();
    $path = str_replace(elgg_get_site_url(), '', $uri);
    $path = trim($path, "/");
    if (strpos($path, "?")) {
        $path = substr($path, 0, strpos($path, "?"));
    }

    // @todo feels hacky
    $segments = explode('/', $path);
    if (isset($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) {
    global $CONFIG;

    $context = trim($context);

    if (empty($context)) {
        return false;
    }

    $context = strtolower($context);

    array_pop($CONFIG->context);
    array_push($CONFIG->context, $context);

    return true;
}

function elgg_get_context() {
    global $CONFIG;

    if (!$CONFIG->context) {
        return null;
    }

    return $CONFIG->context[count($CONFIG->context) - 1];
}

function elgg_push_context($context) {
    global $CONFIG;

    array_push($CONFIG->context, $context);
}

function elgg_pop_context() {
    global $CONFIG;

    return array_pop($CONFIG->context);
}

function elgg_in_context($context) {
    global $CONFIG;

    return in_array($context, $CONFIG->context);
}

function page_owner_boot() {

    elgg_register_plugin_hook_handler('page_owner', 'system', 'default_page_owner_handler');

    // Bootstrap the context stack by setting its first entry to the handler.
    // This is the first segment of the URL and the handler is set by the rewrite rules.
    // @todo this does not work for actions

    $request = _elgg_services()->request;

    // don't do this for *_handler.php, etc.
    if (basename($request->server->get('SCRIPT_FILENAME')) === 'index.php') {
        $context = $request->getFirstUrlSegment();
        if (!$context) {
            $context = 'main';
        }

        elgg_set_context($context);
    }
}

elgg_register_event_handler('boot', 'system', 'page_owner_boot');