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<?php |
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declare(strict_types=1); |
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namespace Lit\Middleware\IpAddress; |
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use Lit\Nimo\Middlewares\AbstractMiddleware; |
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use Psr\Http\Message\ResponseInterface; |
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use Psr\Http\Message\ServerRequestInterface; |
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class IpAddressParser extends AbstractMiddleware |
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{ |
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/** |
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* @var array |
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*/ |
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protected $trustedProxies; |
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/** |
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* @var array |
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*/ |
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protected $headers; |
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/** |
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* @var ?string |
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*/ |
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protected $ipAddress; |
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public function __construct( |
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array $trustedProxies = [], |
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array $headers = [] |
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) { |
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$this->trustedProxies = $trustedProxies; |
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$this->headers = $headers; |
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} |
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/** |
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* @return string |
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*/ |
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public function getIpAddress(): ?string |
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{ |
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return $this->ipAddress; |
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} |
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public static function getIpAddressFromRequest( |
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ServerRequestInterface $request, |
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array $trustedProxies = [], |
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array $headers = [] |
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): ?string { |
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$headers = $headers ?: [ |
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'Forwarded', |
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'X-Forwarded-For', |
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'X-Forwarded', |
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'X-Cluster-Client-Ip', |
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'Client-Ip', |
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]; |
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$params = $request->getServerParams(); |
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$remoteAddr = $params['REMOTE_ADDR'] ?? ''; |
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if (!self::isValidIpAddress($remoteAddr)) { |
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return null; |
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} |
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if (empty($trustedProxies) || !in_array($remoteAddr, $trustedProxies)) { |
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return $remoteAddr; |
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} |
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$ip = self::getIpAddressFromHeaders($request, $headers); |
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if (!empty($ip)) { |
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return $ip; |
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} |
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return $remoteAddr; |
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} |
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protected function main(): ResponseInterface |
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{ |
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$this->attachToRequest(); |
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$this->ipAddress = static::getIpAddressFromRequest($this->request, $this->trustedProxies, $this->headers); |
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return $this->delegate(); |
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} |
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protected static function isValidIpAddress(string $ip): bool |
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{ |
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return false !== filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4 | FILTER_FLAG_IPV6); |
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} |
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/** |
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* @param ServerRequestInterface $request |
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* @param string[] $headers |
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* @return null|string |
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*/ |
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protected static function getIpAddressFromHeaders(ServerRequestInterface $request, array $headers): ?string |
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{ |
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foreach ($headers as $headerName) { |
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$headerValue = trim(explode(',', $request->getHeaderLine($headerName))[0]); |
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if (empty($headerValue)) { |
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continue; |
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} |
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if (strtolower($headerName) == 'forwarded') { |
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$headerValue = static::parseForwarded($headerValue); |
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} |
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if (is_null($headerValue)) { |
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continue; |
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} |
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if (static::isValidIpAddress($headerValue)) { |
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return $headerValue; |
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} |
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} |
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return null; |
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} |
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protected static function parseForwarded($headerValue): ?string |
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{ |
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foreach (explode(';', $headerValue) as $headerPart) { |
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if (strtolower(substr($headerPart, 0, 4)) == 'for=') { |
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$for = explode(']', $headerPart); |
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return trim(substr($for[0], 4), " \t\n\r\0\x0B\"[]"); |
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} |
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} |
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return null; |
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} |
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} |
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litphp /
middleware-ip-address
