upgrade.php

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<?php

$site_url = elgg_get_site_url();
$site_host = parse_url($site_url, PHP_URL_HOST) . '/';

// turn any full in-site URLs into absolute paths
$forward_url = get_input('forward', '/admin', false);
$forward_url = str_replace([$site_url, $site_host], '/', $forward_url);

if (elgg_strpos($forward_url, '/') !== 0) {
    $forward_url = '/' . $forward_url;
}

$refresh_url = elgg_generate_url('upgrade:run', [
    'upgrade' => 'upgrade',
    'forward' => $forward_url,
]);

// sign the url in order to get past the protection
$refresh_url = elgg_http_get_signed_url($refresh_url);

// render content before head so that JavaScript and CSS can be loaded. See #4032
$body = elgg_format_element('div', ['style' => 'margin-top: 200px;'], elgg_view('graphics/ajax_loader', ['hidden' => false]));

$head = elgg_view('page/elements/head', ['title' => elgg_echo('upgrading')]);

$head .= elgg_format_element('meta', [
    'http-equiv' => 'refresh',
    'content' => '1;url=' . $refresh_url,
], '', ['is_xml' => true]);

echo elgg_view('page/elements/html', [
    'head' => $head,
    'body' => $body,
]);