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<?php

declare(strict_types=1);

namespace Laminas\Diactoros;

use function is_callable;

/**
 * Marshal the $_SERVER array
 *
 * Pre-processes and returns the $_SERVER superglobal. In particularly, it
 * attempts to detect the Authorization header, which is often not aggregated
 * correctly under various SAPI/httpd combinations.
 *
 * @param null|callable $apacheRequestHeaderCallback Callback that can be used to
 *     retrieve Apache request headers. This defaults to
 *     `apache_request_headers` under the Apache mod_php.
 * @return array Either $server verbatim, or with an added HTTP_AUTHORIZATION header.
 */
function normalizeServer(array $server, ?callable $apacheRequestHeaderCallback = null): array
{
    if (null === $apacheRequestHeaderCallback && is_callable('apache_request_headers')) {
        $apacheRequestHeaderCallback = 'apache_request_headers';
    }

    // If the HTTP_AUTHORIZATION value is already set, or the callback is not
    // callable, we return verbatim
    if (
        isset($server['HTTP_AUTHORIZATION'])
        || ! is_callable($apacheRequestHeaderCallback)
    ) {
        return $server;
    }

    $apacheRequestHeaders = $apacheRequestHeaderCallback();
    if (isset($apacheRequestHeaders['Authorization'])) {
        $server['HTTP_AUTHORIZATION'] = $apacheRequestHeaders['Authorization'];
        return $server;
    }

    if (isset($apacheRequestHeaders['authorization'])) {
        $server['HTTP_AUTHORIZATION'] = $apacheRequestHeaders['authorization'];
        return $server;
    }

    return $server;
}