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<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\HttpClient;

use Psr\Log\LoggerAwareInterface;
use Psr\Log\LoggerAwareTrait;
use Symfony\Component\HttpClient\Exception\InvalidArgumentException;
use Symfony\Component\HttpClient\Exception\TransportException;
use Symfony\Component\HttpClient\Internal\NativeClientState;
use Symfony\Component\HttpClient\Response\NativeResponse;
use Symfony\Component\HttpClient\Response\ResponseStream;
use Symfony\Contracts\HttpClient\HttpClientInterface;
use Symfony\Contracts\HttpClient\ResponseInterface;
use Symfony\Contracts\HttpClient\ResponseStreamInterface;
use Symfony\Contracts\Service\ResetInterface;

/**
 * A portable implementation of the HttpClientInterface contracts based on PHP stream wrappers.
 *
 * PHP stream wrappers are able to fetch response bodies concurrently,
 * but each request is opened synchronously.
 *
 * @author Nicolas Grekas <p@tchwork.com>
 */
final class NativeHttpClient implements HttpClientInterface, LoggerAwareInterface, ResetInterface
{
    use HttpClientTrait;
    use LoggerAwareTrait;

public const OPTIONS_DEFAULTS = HttpClientInterface::OPTIONS_DEFAULTS + [
        'crypto_method' => \STREAM_CRYPTO_METHOD_TLSv1_2_CLIENT,
    ];

private array $defaultOptions = self::OPTIONS_DEFAULTS;
    private static array $emptyDefaults = self::OPTIONS_DEFAULTS;

private NativeClientState $multi;

/**
     * @param array $defaultOptions     Default request's options
     * @param int   $maxHostConnections The maximum number of connections to open
     *
     * @see HttpClientInterface::OPTIONS_DEFAULTS for available options
     */
    public function __construct(array $defaultOptions = [], int $maxHostConnections = 6)
    {
        $this->defaultOptions['buffer'] ??= self::shouldBuffer(...);

if ($defaultOptions) {
            [, $this->defaultOptions] = self::prepareRequest(null, null, $defaultOptions, $this->defaultOptions);
        }

$this->multi = new NativeClientState();
        $this->multi->maxHostConnections = 0 < $maxHostConnections ? $maxHostConnections : \PHP_INT_MAX;
    }

/**
     * @see HttpClientInterface::OPTIONS_DEFAULTS for available options
     */
    public function request(string $method, string $url, array $options = []): ResponseInterface
    {
        [$url, $options] = self::prepareRequest($method, $url, $options, $this->defaultOptions);

if ($options['bindto']) {
            if (file_exists($options['bindto'])) {
                throw new TransportException(__CLASS__.' cannot bind to local Unix sockets, use e.g. CurlHttpClient instead.');
            }
            if (str_starts_with($options['bindto'], 'if!')) {
                throw new TransportException(__CLASS__.' cannot bind to network interfaces, use e.g. CurlHttpClient instead.');
            }
            if (str_starts_with($options['bindto'], 'host!')) {
                $options['bindto'] = substr($options['bindto'], 5);
            }
        }

$hasContentLength = isset($options['normalized_headers']['content-length']);
        $hasBody = '' !== $options['body'] || 'POST' === $method || $hasContentLength;

$options['body'] = self::getBodyAsString($options['body']);

if ('chunked' === substr($options['normalized_headers']['transfer-encoding'][0] ?? '', \strlen('Transfer-Encoding: '))) {
            unset($options['normalized_headers']['transfer-encoding']);
            $options['headers'] = array_merge(...array_values($options['normalized_headers']));
            $options['body'] = self::dechunk($options['body']);
        }
        if ('' === $options['body'] && $hasBody && !$hasContentLength) {
            $options['headers'][] = 'Content-Length: 0';
        }
        if ($hasBody && !isset($options['normalized_headers']['content-type'])) {
            $options['headers'][] = 'Content-Type: application/x-www-form-urlencoded';
        }

if (\extension_loaded('zlib') && !isset($options['normalized_headers']['accept-encoding'])) {
            // gzip is the most widely available algo, no need to deal with deflate
            $options['headers'][] = 'Accept-Encoding: gzip';
        }

if ($options['peer_fingerprint']) {
            if (isset($options['peer_fingerprint']['pin-sha256']) && 1 === \count($options['peer_fingerprint'])) {
                throw new TransportException(__CLASS__.' cannot verify "pin-sha256" fingerprints, please provide a "sha256" one.');
            }

unset($options['peer_fingerprint']['pin-sha256']);
        }

$info = [
            'response_headers' => [],
            'url' => $url,
            'error' => null,
            'canceled' => false,
            'http_method' => $method,
            'http_code' => 0,
            'redirect_count' => 0,
            'start_time' => 0.0,
            'connect_time' => 0.0,
            'redirect_time' => 0.0,
            'pretransfer_time' => 0.0,
            'starttransfer_time' => 0.0,
            'total_time' => 0.0,
            'namelookup_time' => 0.0,
            'size_upload' => 0,
            'size_download' => 0,
            'size_body' => \strlen($options['body']),
            'primary_ip' => '',
            'primary_port' => 'http:' === $url['scheme'] ? 80 : 443,
            'debug' => \extension_loaded('curl') ? '' : "* Enable the curl extension for better performance\n",
        ];

if ($onProgress = $options['on_progress']) {
            $maxDuration = 0 < $options['max_duration'] ? $options['max_duration'] : \INF;
            $onProgress = static function (...$progress) use ($onProgress, &$info, $maxDuration) {
                if ($info['total_time'] >= $maxDuration) {
                    throw new TransportException(sprintf('Max duration was reached for "%s".', implode('', $info['url'])));
                }

$progressInfo = $info;
                $progressInfo['url'] = implode('', $info['url']);
                unset($progressInfo['size_body']);

// Memoize the last progress to ease calling the callback periodically when no network transfer happens
                static $lastProgress = [0, 0];

if ($progress && -1 === $progress[0]) {
                    // Response completed
                    $lastProgress[0] = max($lastProgress);
                } else {
                    $lastProgress = $progress ?: $lastProgress;
                }

$onProgress($lastProgress[0], $lastProgress[1], $progressInfo);
            };
        } elseif (0 < $options['max_duration']) {
            $maxDuration = $options['max_duration'];
            $onProgress = static function () use (&$info, $maxDuration): void {
                if ($info['total_time'] >= $maxDuration) {
                    throw new TransportException(sprintf('Max duration was reached for "%s".', implode('', $info['url'])));
                }
            };
        }

// Always register a notification callback to compute live stats about the response
        $notification = static function (int $code, int $severity, ?string $msg, int $msgCode, int $dlNow, int $dlSize) use ($onProgress, &$info) {
            $info['total_time'] = microtime(true) - $info['start_time'];

if (\STREAM_NOTIFY_PROGRESS === $code) {
                $info['starttransfer_time'] = $info['starttransfer_time'] ?: $info['total_time'];
                $info['size_upload'] += $dlNow ? 0 : $info['size_body'];
                $info['size_download'] = $dlNow;
            } elseif (\STREAM_NOTIFY_CONNECT === $code) {
                $info['connect_time'] = $info['total_time'];
                $info['debug'] .= $info['request_header'];
                unset($info['request_header']);
            } else {
                return;
            }

if ($onProgress) {
                $onProgress($dlNow, $dlSize);
            }
        };

if ($options['resolve']) {
            $this->multi->dnsCache = $options['resolve'] + $this->multi->dnsCache;
        }

$this->logger?->info(sprintf('Request: "%s %s"', $method, implode('', $url)));

if (!isset($options['normalized_headers']['user-agent'])) {
            $options['headers'][] = 'User-Agent: Symfony HttpClient (Native)';
        }

if (0 < $options['max_duration']) {
            $options['timeout'] = min($options['max_duration'], $options['timeout']);
        }

switch ($cryptoMethod = $options['crypto_method']) {
            case \STREAM_CRYPTO_METHOD_TLSv1_0_CLIENT:
                $cryptoMethod |= \STREAM_CRYPTO_METHOD_TLSv1_1_CLIENT;
                // no break
            case \STREAM_CRYPTO_METHOD_TLSv1_1_CLIENT:
                $cryptoMethod |= \STREAM_CRYPTO_METHOD_TLSv1_2_CLIENT;
                // no break
            case \STREAM_CRYPTO_METHOD_TLSv1_2_CLIENT:
                $cryptoMethod |= \STREAM_CRYPTO_METHOD_TLSv1_3_CLIENT;
        }

$context = [
            'http' => [
                'protocol_version' => min($options['http_version'] ?: '1.1', '1.1'),
                'method' => $method,
                'content' => $options['body'],
                'ignore_errors' => true,
                'curl_verify_ssl_peer' => $options['verify_peer'],
                'curl_verify_ssl_host' => $options['verify_host'],
                'auto_decode' => false, // Disable dechunk filter, it's incompatible with stream_select()
                'timeout' => $options['timeout'],
                'follow_location' => false, // We follow redirects ourselves - the native logic is too limited
            ],
            'ssl' => array_filter([
                'verify_peer' => $options['verify_peer'],
                'verify_peer_name' => $options['verify_host'],
                'cafile' => $options['cafile'],
                'capath' => $options['capath'],
                'local_cert' => $options['local_cert'],
                'local_pk' => $options['local_pk'],
                'passphrase' => $options['passphrase'],
                'ciphers' => $options['ciphers'],
                'peer_fingerprint' => $options['peer_fingerprint'],
                'capture_peer_cert_chain' => $options['capture_peer_cert_chain'],
                'allow_self_signed' => (bool) $options['peer_fingerprint'],
                'SNI_enabled' => true,
                'disable_compression' => true,
                'crypto_method' => $cryptoMethod,
            ], static fn ($v) => null !== $v),
            'socket' => [
                'bindto' => $options['bindto'],
                'tcp_nodelay' => true,
            ],
        ];

$context = stream_context_create($context, ['notification' => $notification]);

$resolver = static function ($multi) use ($context, $options, $url, &$info, $onProgress) {
            [$host, $port] = self::parseHostPort($url, $info);

if (!isset($options['normalized_headers']['host'])) {
                $options['headers'][] = 'Host: '.$host.$port;
            }

$proxy = self::getProxy($options['proxy'], $url, $options['no_proxy']);

if (!self::configureHeadersAndProxy($context, $host, $options['headers'], $proxy, 'https:' === $url['scheme'])) {
                $ip = self::dnsResolve($host, $multi, $info, $onProgress);
                $url['authority'] = substr_replace($url['authority'], $ip, -\strlen($host) - \strlen($port), \strlen($host));
            }

return [self::createRedirectResolver($options, $host, $port, $proxy, $info, $onProgress), implode('', $url)];
        };

return new NativeResponse($this->multi, $context, implode('', $url), $options, $info, $resolver, $onProgress, $this->logger);
    }

public function stream(ResponseInterface|iterable $responses, ?float $timeout = null): ResponseStreamInterface
    {
        if ($responses instanceof NativeResponse) {
            $responses = [$responses];
        }

return new ResponseStream(NativeResponse::stream($responses, $timeout));
    }

public function reset(): void
    {
        $this->multi->reset();
    }

private static function getBodyAsString($body): string
    {
        if (\is_resource($body)) {
            return stream_get_contents($body);
        }

if (!$body instanceof \Closure) {
            return $body;
        }

$result = '';

while ('' !== $data = $body(self::$CHUNK_SIZE)) {
            if (!\is_string($data)) {
                throw new TransportException(sprintf('Return value of the "body" option callback must be string, "%s" returned.', get_debug_type($data)));
            }

$result .= $data;
        }

return $result;
    }

/**
     * Extracts the host and the port from the URL.
     */
    private static function parseHostPort(array $url, array &$info): array
    {
        if ($port = parse_url($url['authority'], \PHP_URL_PORT) ?: '') {
            $info['primary_port'] = $port;
            $port = ':'.$port;
        } else {
            $info['primary_port'] = 'http:' === $url['scheme'] ? 80 : 443;
        }

return [parse_url($url['authority'], \PHP_URL_HOST), $port];
    }

/**
     * Resolves the IP of the host using the local DNS cache if possible.
     */
    private static function dnsResolve(string $host, NativeClientState $multi, array &$info, ?\Closure $onProgress): string
    {
        if (null === $ip = $multi->dnsCache[$host] ?? null) {
            $info['debug'] .= "* Hostname was NOT found in DNS cache\n";
            $now = microtime(true);

if (!$ip = gethostbynamel($host)) {
                throw new TransportException(sprintf('Could not resolve host "%s".', $host));
            }

$info['namelookup_time'] = microtime(true) - ($info['start_time'] ?: $now);
            $multi->dnsCache[$host] = $ip = $ip[0];
            $info['debug'] .= "* Added {$host}:0:{$ip} to DNS cache\n";
        } else {
            $info['debug'] .= "* Hostname was found in DNS cache\n";
        }

$info['primary_ip'] = $ip;

if ($onProgress) {
            // Notify DNS resolution
            $onProgress();
        }

return $ip;
    }

/**
     * Handles redirects - the native logic is too buggy to be used.
     */
    private static function createRedirectResolver(array $options, string $host, string $port, ?array $proxy, array &$info, ?\Closure $onProgress): \Closure
    {
        $redirectHeaders = [];
        if (0 < $maxRedirects = $options['max_redirects']) {
            $redirectHeaders = ['host' => $host, 'port' => $port];
            $redirectHeaders['with_auth'] = $redirectHeaders['no_auth'] = array_filter($options['headers'], static fn ($h) => 0 !== stripos($h, 'Host:'));

if (isset($options['normalized_headers']['authorization']) || isset($options['normalized_headers']['cookie'])) {
                $redirectHeaders['no_auth'] = array_filter($redirectHeaders['no_auth'], static fn ($h) => 0 !== stripos($h, 'Authorization:') && 0 !== stripos($h, 'Cookie:'));
            }
        }

return static function (NativeClientState $multi, ?string $location, $context) use (&$redirectHeaders, $proxy, &$info, $maxRedirects, $onProgress): ?string {
            if (null === $location || $info['http_code'] < 300 || 400 <= $info['http_code']) {
                $info['redirect_url'] = null;

return null;
            }

try {
                $url = self::parseUrl($location);
            } catch (InvalidArgumentException) {
                $info['redirect_url'] = null;

return null;
            }

$url = self::resolveUrl($url, $info['url']);
            $info['redirect_url'] = implode('', $url);

if ($info['redirect_count'] >= $maxRedirects) {
                return null;
            }

$info['url'] = $url;
            ++$info['redirect_count'];
            $info['redirect_time'] = microtime(true) - $info['start_time'];

// Do like curl and browsers: turn POST to GET on 301, 302 and 303
            if (\in_array($info['http_code'], [301, 302, 303], true)) {
                $options = stream_context_get_options($context)['http'];

if ('POST' === $options['method'] || 303 === $info['http_code']) {
                    $info['http_method'] = $options['method'] = 'HEAD' === $options['method'] ? 'HEAD' : 'GET';
                    $options['content'] = '';
                    $filterContentHeaders = static fn ($h) => 0 !== stripos($h, 'Content-Length:') && 0 !== stripos($h, 'Content-Type:') && 0 !== stripos($h, 'Transfer-Encoding:');
                    $options['header'] = array_filter($options['header'], $filterContentHeaders);
                    $redirectHeaders['no_auth'] = array_filter($redirectHeaders['no_auth'], $filterContentHeaders);
                    $redirectHeaders['with_auth'] = array_filter($redirectHeaders['with_auth'], $filterContentHeaders);

if (\PHP_VERSION_ID >= 80300) {
                        stream_context_set_options($context, ['http' => $options]);
                    } else {
                        stream_context_set_option($context, ['http' => $options]);
                    }
                }
            }

[$host, $port] = self::parseHostPort($url, $info);

if (false !== (parse_url($location, \PHP_URL_HOST) ?? false)) {
                // Authorization and Cookie headers MUST NOT follow except for the initial host name
                $requestHeaders = $redirectHeaders['host'] === $host && $redirectHeaders['port'] === $port ? $redirectHeaders['with_auth'] : $redirectHeaders['no_auth'];
                $requestHeaders[] = 'Host: '.$host.$port;
                $dnsResolve = !self::configureHeadersAndProxy($context, $host, $requestHeaders, $proxy, 'https:' === $url['scheme']);
            } else {
                $dnsResolve = isset(stream_context_get_options($context)['ssl']['peer_name']);
            }

if ($dnsResolve) {
                $ip = self::dnsResolve($host, $multi, $info, $onProgress);
                $url['authority'] = substr_replace($url['authority'], $ip, -\strlen($host) - \strlen($port), \strlen($host));
            }

return implode('', $url);
        };
    }

private static function configureHeadersAndProxy($context, string $host, array $requestHeaders, ?array $proxy, bool $isSsl): bool
    {
        if (null === $proxy) {
            stream_context_set_option($context, 'http', 'header', $requestHeaders);
            stream_context_set_option($context, 'ssl', 'peer_name', $host);

return false;
        }

// Matching "no_proxy" should follow the behavior of curl

foreach ($proxy['no_proxy'] as $rule) {
            $dotRule = '.'.ltrim($rule, '.');

if ('*' === $rule || $host === $rule || str_ends_with($host, $dotRule)) {
                stream_context_set_option($context, 'http', 'proxy', null);
                stream_context_set_option($context, 'http', 'request_fulluri', false);
                stream_context_set_option($context, 'http', 'header', $requestHeaders);
                stream_context_set_option($context, 'ssl', 'peer_name', $host);

return false;
            }
        }

if (null !== $proxy['auth']) {
            $requestHeaders[] = 'Proxy-Authorization: '.$proxy['auth'];
        }

stream_context_set_option($context, 'http', 'proxy', $proxy['url']);
        stream_context_set_option($context, 'http', 'request_fulluri', !$isSsl);
        stream_context_set_option($context, 'http', 'header', $requestHeaders);
        stream_context_set_option($context, 'ssl', 'peer_name', null);

return true;
    }
}

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