netglue/RealIP-Helpers

<?php

declare(strict_types=1);

namespace NetglueRealIP\Helper;

use function str_replace;
use function strpos;
use function strtoupper;

class ClientIPFromSuperGlobals extends ClientIP
{
    /** @var mixed[] Effectively $_SERVER*/
    public $serverArray;

    /** @param mixed[] $serverArray */
    public function __invoke(?array $serverArray = null): ?string
    {
        $this->serverArray = empty($serverArray) ? $_SERVER : $serverArray;

        return $this->getIpAddress();
    }

    public function getRemoteAddress(): ?string
    {
        return isset($this->serverArray['REMOTE_ADDR'])
            ? $this->filterIp($this->serverArray['REMOTE_ADDR'])
            : null;
    }

    protected function getHeaderValue(string $headerName): ?string
    {
        $headerName = $this->normaliseHeaderFromSuperGlobal($headerName);

        return $this->serverArray[$headerName] ?? null;
    }

    private function normaliseHeaderFromSuperGlobal(string $header): string
    {
        $header = strtoupper($header);
        $header = str_replace('-', '_', $header);
        if (strpos($header, 'HTTP_') !== 0) {
            $header = 'HTTP_' . $header;
        }

        return $header;
    }
}