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<?php
/**
* Matomo - free/libre analytics platform
*
* @link https://matomo.org
* @license https://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
*/
namespace Piwik;
/**
* Proxy headers
*
*/
class ProxyHeaders
{
/**
* Get protocol information, with the exception of HTTPS
*
* @return ?string protocol information
*/
public static function getProtocolInformation(): ?string
{
if (isset($_SERVER['SERVER_PORT']) && $_SERVER['SERVER_PORT'] == 443) {
return 'SERVER_PORT=443';
}
if (isset($_SERVER['HTTP_X_FORWARDED_PROTO']) && strtolower($_SERVER['HTTP_X_FORWARDED_PROTO']) == 'https') {
return 'X-Forwarded-Proto';
}
if (isset($_SERVER['HTTP_X_FORWARDED_SCHEME']) && strtolower($_SERVER['HTTP_X_FORWARDED_SCHEME']) == 'https') {
return 'X-Forwarded-Scheme';
}
if (isset($_SERVER['HTTP_X_URL_SCHEME']) && strtolower($_SERVER['HTTP_X_URL_SCHEME']) == 'https') {
return 'X-Url-Scheme';
}
return null;
}
/**
* Get headers present in the HTTP request
*
* @param string[] $recognizedHeaders
* @return string[] HTTP headers
*/
private static function getHeaders(array $recognizedHeaders): array
{
$headers = [];
foreach ($recognizedHeaders as $header) {
if (isset($_SERVER[$header])) {
$headers[] = $header;
}
}
return $headers;
}
/**
* Detect proxy client headers
*
* @return string[] Proxy client HTTP headers
*/
public static function getProxyClientHeaders(): array
{
return self::getHeaders([
'HTTP_CF_CONNECTING_IP',
'HTTP_CLIENT_IP',
'HTTP_X_FORWARDED_FOR',
]);
}
/**
* Detect proxy host headers
*
* @return string[] Proxy host HTTP headers
*/
public static function getProxyHostHeaders(): array
{
return self::getHeaders([
'HTTP_X_FORWARDED_HOST',
]);
}
/**
* Detect proxy scheme headers
*
* @return string[] Proxy scheme HTTP headers
*/
public static function getProxySchemeHeaders(): array
{
return self::getHeaders([
'HTTP_X_FORWARDED_PROTO',
'HTTP_X_FORWARDED_SCHEME',
'HTTP_X_URL_SCHEME',
]);
}
}
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