RemoteAddress.php
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RemoteAddress.php
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	<?php
	declare(strict_types=1);

	namespace Keruald\OmniTools\HTTP\Requests;

	use Keruald\OmniTools\Network\IP;

	class RemoteAddress {

	/**
	* @var string
	*/
	private $remoteAddress;

	///
	/// Constructor
	///

	public function __construct (string $remoteAddress = '') {
	$this->remoteAddress = $remoteAddress;
	}

	public static function fromServer () : self {
	return new self(self::extractRemoteAddressesFromHeaders());
	}

	///
	/// Format methods
	///

	public function getClientAddress () : string {
	// Header contains 'clientIP, proxyIP, anotherProxyIP'
	// or 'clientIP proxyIP anotherProxyIP'
	// The client address to return is then the first value.
	// See draft-ietf-appsawg-http-forwarded-10.
	$ips = preg_split("/[\s,]+/", $this->remoteAddress, 2);
	return trim($ips[0]);
	}

	public function isFromLocalHost () : bool {
	return IP::isLoopBack($this->getClientAddress());
	}

	public function getAll () : string {
	return $this->remoteAddress;
	}


	public function has () : bool {
	return $this->remoteAddress !== "";
	}

	///
	/// Information methods
	///

	///
	/// Helper methods to determine the remote address
	///

	/**
	* Allows to get all the remote addresses from relevant headers
	*/
	public static function extractRemoteAddressesFromHeaders () : string {
	foreach (self::listRemoteAddressHeaders() as $candidate) {
	if (isset($_SERVER[$candidate])) {
	return $_SERVER[$candidate];
	}
	}

	return "";
	}

	///
	/// Data sources
	///

	public static function listRemoteAddressHeaders () : array {
	return [
	// Standard header provided by draft-ietf-appsawg-http-forwarded-10
	'HTTP_X_FORWARDED_FOR',

	// Legacy headers
	'HTTP_CLIENT_IP',
	'HTTP_FORWARDED',
	'HTTP_FORWARDED_FOR',
	'HTTP_X_CLUSTER_CLIENT_IP',
	'HTTP_X_FORWARDED',

	// Default header if no proxy information could be detected
	'REMOTE_ADDR',
	];
	}
	}

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