initialize_elgg.php

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<?php 
$elgg = array(
    'config' => array(
        'lastcache' => (int)elgg_get_config('lastcache'),
        'viewtype' => elgg_get_viewtype(),
        'simplecache_enabled' => (int)elgg_is_simplecache_enabled(),
    ),
    'security' => array(
        'token' => array(
            '__elgg_ts' => $ts = time(),
            '__elgg_token' => generate_action_token($ts),
        ),
    ),
    'session' => array(
        'user' => null,
        'token' => _elgg_services()->session->get('__elgg_session'),
    ),
);

$page_owner = elgg_get_page_owner_entity();
if ($page_owner instanceof ElggEntity) {
    $elgg['page_owner'] = $page_owner->toObject();
}

$user = elgg_get_logged_in_user_entity();
if ($user instanceof ElggUser) {
    $user_object = $user->toObject();
    $user_object->admin = $user->isAdmin();
    $elgg['session']['user'] = $user_object;
}

?>

var elgg = <?php echo json_encode($elgg); ?>;
<?php
// note: elgg.session.user needs to be wrapped with elgg.ElggUser, but this class isn't
// defined yet. So this is delayed until after the classes are defined, in js/lib/session.js