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<?php declare(strict_types=1);
/*
* This file is part of Composer.
*
* (c) Nils Adermann <naderman@naderman.de>
* Jordi Boggiano <j.boggiano@seld.be>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Composer\Util\Http;
/**
* Proxy discovery and helper class
*
* @internal
* @author John Stevenson <john-stevenson@blueyonder.co.uk>
*/
class ProxyHelper
{
/**
* Returns proxy environment values
*
* @return array{string|null, string|null, string|null} httpProxy, httpsProxy, noProxy values
*
* @throws \RuntimeException on malformed url
*/
public static function getProxyData(): array
{
$httpProxy = null;
$httpsProxy = null;
// Handle http_proxy/HTTP_PROXY on CLI only for security reasons
if (PHP_SAPI === 'cli' || PHP_SAPI === 'phpdbg') {
if ($env = self::getProxyEnv(['http_proxy', 'HTTP_PROXY'], $name)) {
$httpProxy = self::checkProxy($env, $name);
}
}
// Prefer CGI_HTTP_PROXY if available
if ($env = self::getProxyEnv(['CGI_HTTP_PROXY'], $name)) {
$httpProxy = self::checkProxy($env, $name);
}
// Handle https_proxy/HTTPS_PROXY
if ($env = self::getProxyEnv(['https_proxy', 'HTTPS_PROXY'], $name)) {
$httpsProxy = self::checkProxy($env, $name);
} else {
$httpsProxy = $httpProxy;
}
// Handle no_proxy
$noProxy = self::getProxyEnv(['no_proxy', 'NO_PROXY'], $name);
return [$httpProxy, $httpsProxy, $noProxy];
}
/**
* Returns http context options for the proxy url
*
* @return array{http: array{proxy: string, header?: string}}
*/
public static function getContextOptions(string $proxyUrl): array
{
$proxy = parse_url($proxyUrl);
// Remove any authorization
$proxyUrl = self::formatParsedUrl($proxy, false);
$proxyUrl = str_replace(['http://', 'https://'], ['tcp://', 'ssl://'], $proxyUrl);
$options['http']['proxy'] = $proxyUrl;
// Handle any authorization
if (isset($proxy['user'])) {
$auth = rawurldecode($proxy['user']);
if (isset($proxy['pass'])) {
$auth .= ':' . rawurldecode($proxy['pass']);
}
$auth = base64_encode($auth);
// Set header as a string
$options['http']['header'] = "Proxy-Authorization: Basic {$auth}";
}
return $options;
}
/**
* Sets/unsets request_fulluri value in http context options array
*
* @param mixed[] $options Set by method
*/
public static function setRequestFullUri(string $requestUrl, array &$options): void
{
if ('http' === parse_url($requestUrl, PHP_URL_SCHEME)) {
$options['http']['request_fulluri'] = true;
} else {
unset($options['http']['request_fulluri']);
}
}
/**
* Searches $_SERVER for case-sensitive values
*
* @param string[] $names Names to search for
* @param string|null $name Name of any found value
*
* @return string|null The found value
*/
private static function getProxyEnv(array $names, ?string &$name): ?string
{
foreach ($names as $name) {
if (!empty($_SERVER[$name])) {
return $_SERVER[$name];
}
}
return null;
}
/**
* Checks and formats a proxy url from the environment
*
* @throws \RuntimeException on malformed url
* @return string The formatted proxy url
*/
private static function checkProxy(string $proxyUrl, string $envName): string
{
$error = sprintf('malformed %s url', $envName);
$proxy = parse_url($proxyUrl);
// We need parse_url to have identified a host
if (!isset($proxy['host'])) {
throw new \RuntimeException($error);
}
$proxyUrl = self::formatParsedUrl($proxy, true);
// We need a port because streams and curl use different defaults
if (!parse_url($proxyUrl, PHP_URL_PORT)) {
throw new \RuntimeException($error);
}
return $proxyUrl;
}
/**
* Formats a url from its component parts
*
* @param array{scheme?: string, host: string, port?: int, user?: string, pass?: string} $proxy
*
* @return string The formatted value
*/
private static function formatParsedUrl(array $proxy, bool $includeAuth): string
{
$proxyUrl = isset($proxy['scheme']) ? strtolower($proxy['scheme']) . '://' : '';
if ($includeAuth && isset($proxy['user'])) {
$proxyUrl .= $proxy['user'];
if (isset($proxy['pass'])) {
$proxyUrl .= ':' . $proxy['pass'];
}
$proxyUrl .= '@';
}
$proxyUrl .= $proxy['host'];
if (isset($proxy['port'])) {
$proxyUrl .= ':' . $proxy['port'];
} elseif (strpos($proxyUrl, 'http://') === 0) {
$proxyUrl .= ':80';
} elseif (strpos($proxyUrl, 'https://') === 0) {
$proxyUrl .= ':443';
}
return $proxyUrl;
}
}