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 = "<div style='margin-top:200px'>" . elgg_view('graphics/ajax_loader', ['hidden' => false]) . "</div>";

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

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

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