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<?php
/**
* fsockopen HTTP transport
*
* @package Requests\Transport
*/
namespace WpOrg\Requests\Transport;
use WpOrg\Requests\Capability;
use WpOrg\Requests\Exception;
use WpOrg\Requests\Exception\InvalidArgument;
use WpOrg\Requests\Port;
use WpOrg\Requests\Requests;
use WpOrg\Requests\Ssl;
use WpOrg\Requests\Transport;
use WpOrg\Requests\Utility\CaseInsensitiveDictionary;
use WpOrg\Requests\Utility\InputValidator;
/**
* fsockopen HTTP transport
*
* @package Requests\Transport
*/
final class Fsockopen implements Transport {
/**
* Second to microsecond conversion
*
* @var integer
*/
const SECOND_IN_MICROSECONDS = 1000000;
/**
* Raw HTTP data
*
* @var string
*/
public $headers = '';
/**
* Stream metadata
*
* @var array Associative array of properties, see {@link https://www.php.net/stream_get_meta_data}
*/
public $info;
/**
* What's the maximum number of bytes we should keep?
*
* @var int|bool Byte count, or false if no limit.
*/
private $max_bytes = false;
/**
* Cache for received connection errors.
*
* @var string
*/
private $connect_error = '';
/**
* Perform a request
*
* @param string|Stringable $url URL to request
* @param array $headers Associative array of request headers
* @param string|array $data Data to send either as the POST body, or as parameters in the URL for a GET/HEAD
* @param array $options Request options, see {@see \WpOrg\Requests\Requests::response()} for documentation
* @return string Raw HTTP result
*
* @throws \WpOrg\Requests\Exception\InvalidArgument When the passed $url argument is not a string or Stringable.
* @throws \WpOrg\Requests\Exception\InvalidArgument When the passed $headers argument is not an array.
* @throws \WpOrg\Requests\Exception\InvalidArgument When the passed $data parameter is not an array or string.
* @throws \WpOrg\Requests\Exception\InvalidArgument When the passed $options argument is not an array.
* @throws \WpOrg\Requests\Exception On failure to connect to socket (`fsockopenerror`)
* @throws \WpOrg\Requests\Exception On socket timeout (`timeout`)
*/
public function request($url, $headers = [], $data = [], $options = []) {
if (InputValidator::is_string_or_stringable($url) === false) {
throw InvalidArgument::create(1, '$url', 'string|Stringable', gettype($url));
}
if (is_array($headers) === false) {
throw InvalidArgument::create(2, '$headers', 'array', gettype($headers));
}
if (!is_array($data) && !is_string($data)) {
if ($data === null) {
$data = '';
} else {
throw InvalidArgument::create(3, '$data', 'array|string', gettype($data));
}
}
if (is_array($options) === false) {
throw InvalidArgument::create(4, '$options', 'array', gettype($options));
}
$options['hooks']->dispatch('fsockopen.before_request');
$url_parts = parse_url($url);
if (empty($url_parts)) {
throw new Exception('Invalid URL.', 'invalidurl', $url);
}
$host = $url_parts['host'];
$context = stream_context_create();
$verifyname = false;
$case_insensitive_headers = new CaseInsensitiveDictionary($headers);
// HTTPS support
if (isset($url_parts['scheme']) && strtolower($url_parts['scheme']) === 'https') {
$remote_socket = 'ssl://' . $host;
if (!isset($url_parts['port'])) {
$url_parts['port'] = Port::HTTPS;
}
$context_options = [
'verify_peer' => true,
'capture_peer_cert' => true,
];
$verifyname = true;
// SNI, if enabled (OpenSSL >=0.9.8j)
// phpcs:ignore PHPCompatibility.Constants.NewConstants.openssl_tlsext_server_nameFound
if (defined('OPENSSL_TLSEXT_SERVER_NAME') && OPENSSL_TLSEXT_SERVER_NAME) {
$context_options['SNI_enabled'] = true;
if (isset($options['verifyname']) && $options['verifyname'] === false) {
$context_options['SNI_enabled'] = false;
}
}
if (isset($options['verify'])) {
if ($options['verify'] === false) {
$context_options['verify_peer'] = false;
$context_options['verify_peer_name'] = false;
$verifyname = false;
} elseif (is_string($options['verify'])) {
$context_options['cafile'] = $options['verify'];
}
}
if (isset($options['verifyname']) && $options['verifyname'] === false) {
$context_options['verify_peer_name'] = false;
$verifyname = false;
}
// Handle the PHP 8.4 deprecation (PHP 9.0 removal) of the function signature we use for stream_context_set_option().
// Ref: https://wiki.php.net/rfc/deprecate_functions_with_overloaded_signatures#stream_context_set_option
if (function_exists('stream_context_set_options')) {
// PHP 8.3+.
stream_context_set_options($context, ['ssl' => $context_options]);
} else {
// PHP < 8.3.
stream_context_set_option($context, ['ssl' => $context_options]);
}
} else {
$remote_socket = 'tcp://' . $host;
}
$this->max_bytes = $options['max_bytes'];
if (!isset($url_parts['port'])) {
$url_parts['port'] = Port::HTTP;
}
$remote_socket .= ':' . $url_parts['port'];
// phpcs:ignore WordPress.PHP.DevelopmentFunctions.error_log_set_error_handler
set_error_handler([$this, 'connect_error_handler'], E_WARNING | E_NOTICE);
$options['hooks']->dispatch('fsockopen.remote_socket', [&$remote_socket]);
$socket = stream_socket_client($remote_socket, $errno, $errstr, ceil($options['connect_timeout']), STREAM_CLIENT_CONNECT, $context);
restore_error_handler();
if ($verifyname && !$this->verify_certificate_from_context($host, $context)) {
throw new Exception('SSL certificate did not match the requested domain name', 'ssl.no_match');
}
if (!$socket) {
if ($errno === 0) {
// Connection issue
throw new Exception(rtrim($this->connect_error), 'fsockopen.connect_error');
}
throw new Exception($errstr, 'fsockopenerror', null, $errno);
}
$data_format = $options['data_format'];
if ($data_format === 'query') {
$path = self::format_get($url_parts, $data);
$data = '';
} else {
$path = self::format_get($url_parts, []);
}
$options['hooks']->dispatch('fsockopen.remote_host_path', [&$path, $url]);
$request_body = '';
$out = sprintf("%s %s HTTP/%.1F\r\n", $options['type'], $path, $options['protocol_version']);
if ($options['type'] !== Requests::TRACE) {
if (is_array($data)) {
$request_body = http_build_query($data, '', '&');
} else {
$request_body = $data;
}
// Always include Content-length on POST requests to prevent
// 411 errors from some servers when the body is empty.
if (!empty($data) || $options['type'] === Requests::POST) {
if (!isset($case_insensitive_headers['Content-Length'])) {
$headers['Content-Length'] = strlen($request_body);
}
if (!isset($case_insensitive_headers['Content-Type'])) {
$headers['Content-Type'] = 'application/x-www-form-urlencoded; charset=UTF-8';
}
}
}
if (!isset($case_insensitive_headers['Host'])) {
$out .= sprintf('Host: %s', $url_parts['host']);
$scheme_lower = strtolower($url_parts['scheme']);
if (($scheme_lower === 'http' && $url_parts['port'] !== Port::HTTP) || ($scheme_lower === 'https' && $url_parts['port'] !== Port::HTTPS)) {
$out .= ':' . $url_parts['port'];
}
$out .= "\r\n";
}
if (!isset($case_insensitive_headers['User-Agent'])) {
$out .= sprintf("User-Agent: %s\r\n", $options['useragent']);
}
$accept_encoding = $this->accept_encoding();
if (!isset($case_insensitive_headers['Accept-Encoding']) && !empty($accept_encoding)) {
$out .= sprintf("Accept-Encoding: %s\r\n", $accept_encoding);
}
$headers = Requests::flatten($headers);
if (!empty($headers)) {
$out .= implode("\r\n", $headers) . "\r\n";
}
$options['hooks']->dispatch('fsockopen.after_headers', [&$out]);
if (substr($out, -2) !== "\r\n") {
$out .= "\r\n";
}
if (!isset($case_insensitive_headers['Connection'])) {
$out .= "Connection: Close\r\n";
}
$out .= "\r\n" . $request_body;
$options['hooks']->dispatch('fsockopen.before_send', [&$out]);
fwrite($socket, $out);
$options['hooks']->dispatch('fsockopen.after_send', [$out]);
if (!$options['blocking']) {
fclose($socket);
$fake_headers = '';
$options['hooks']->dispatch('fsockopen.after_request', [&$fake_headers]);
return '';
}
$timeout_sec = (int) floor($options['timeout']);
if ($timeout_sec === $options['timeout']) {
$timeout_msec = 0;
} else {
$timeout_msec = self::SECOND_IN_MICROSECONDS * $options['timeout'] % self::SECOND_IN_MICROSECONDS;
}
stream_set_timeout($socket, $timeout_sec, $timeout_msec);
$response = '';
$body = '';
$headers = '';
$this->info = stream_get_meta_data($socket);
$size = 0;
$doingbody = false;
$download = false;
if ($options['filename']) {
// phpcs:ignore WordPress.PHP.NoSilencedErrors -- Silenced the PHP native warning in favour of throwing an exception.
$download = @fopen($options['filename'], 'wb');
if ($download === false) {
$error = error_get_last();
throw new Exception($error['message'], 'fopen');
}
}
while (!feof($socket)) {
$this->info = stream_get_meta_data($socket);
if ($this->info['timed_out']) {
throw new Exception('fsocket timed out', 'timeout');
}
$block = fread($socket, Requests::BUFFER_SIZE);
if (!$doingbody) {
$response .= $block;
if (strpos($response, "\r\n\r\n")) {
list($headers, $block) = explode("\r\n\r\n", $response, 2);
$doingbody = true;
}
}
// Are we in body mode now?
if ($doingbody) {
$options['hooks']->dispatch('request.progress', [$block, $size, $this->max_bytes]);
$data_length = strlen($block);
if ($this->max_bytes) {
// Have we already hit a limit?
if ($size === $this->max_bytes) {
continue;
}
if (($size + $data_length) > $this->max_bytes) {
// Limit the length
$limited_length = ($this->max_bytes - $size);
$block = substr($block, 0, $limited_length);
}
}
$size += strlen($block);
if ($download) {
fwrite($download, $block);
} else {
$body .= $block;
}
}
}
$this->headers = $headers;
if ($download) {
fclose($download);
} else {
$this->headers .= "\r\n\r\n" . $body;
}
fclose($socket);
$options['hooks']->dispatch('fsockopen.after_request', [&$this->headers, &$this->info]);
return $this->headers;
}
/**
* Send multiple requests simultaneously
*
* @param array $requests Request data (array of 'url', 'headers', 'data', 'options') as per {@see \WpOrg\Requests\Transport::request()}
* @param array $options Global options, see {@see \WpOrg\Requests\Requests::response()} for documentation
* @return array Array of \WpOrg\Requests\Response objects (may contain \WpOrg\Requests\Exception or string responses as well)
*
* @throws \WpOrg\Requests\Exception\InvalidArgument When the passed $requests argument is not an array or iterable object with array access.
* @throws \WpOrg\Requests\Exception\InvalidArgument When the passed $options argument is not an array.
*/
public function request_multiple($requests, $options) {
// If you're not requesting, we can't get any responses ¯\_(ツ)_/¯
if (empty($requests)) {
return [];
}
if (InputValidator::has_array_access($requests) === false || InputValidator::is_iterable($requests) === false) {
throw InvalidArgument::create(1, '$requests', 'array|ArrayAccess&Traversable', gettype($requests));
}
if (is_array($options) === false) {
throw InvalidArgument::create(2, '$options', 'array', gettype($options));
}
$responses = [];
$class = get_class($this);
foreach ($requests as $id => $request) {
try {
$handler = new $class();
$responses[$id] = $handler->request($request['url'], $request['headers'], $request['data'], $request['options']);
$request['options']['hooks']->dispatch('transport.internal.parse_response', [&$responses[$id], $request]);
} catch (Exception $e) {
$responses[$id] = $e;
}
if (!is_string($responses[$id])) {
$request['options']['hooks']->dispatch('multiple.request.complete', [&$responses[$id], $id]);
}
}
return $responses;
}
/**
* Retrieve the encodings we can accept
*
* @return string Accept-Encoding header value
*/
private static function accept_encoding() {
$type = [];
if (function_exists('gzinflate')) {
$type[] = 'deflate;q=1.0';
}
if (function_exists('gzuncompress')) {
$type[] = 'compress;q=0.5';
}
$type[] = 'gzip;q=0.5';
return implode(', ', $type);
}
/**
* Format a URL given GET data
*
* @param array $url_parts Array of URL parts as received from {@link https://www.php.net/parse_url}
* @param array|object $data Data to build query using, see {@link https://www.php.net/http_build_query}
* @return string URL with data
*/
private static function format_get($url_parts, $data) {
if (!empty($data)) {
if (empty($url_parts['query'])) {
$url_parts['query'] = '';
}
$url_parts['query'] .= '&' . http_build_query($data, '', '&');
$url_parts['query'] = trim($url_parts['query'], '&');
}
if (isset($url_parts['path'])) {
if (isset($url_parts['query'])) {
$get = $url_parts['path'] . '?' . $url_parts['query'];
} else {
$get = $url_parts['path'];
}
} else {
$get = '/';
}
return $get;
}
/**
* Error handler for stream_socket_client()
*
* @param int $errno Error number (e.g. E_WARNING)
* @param string $errstr Error message
*/
public function connect_error_handler($errno, $errstr) {
// Double-check we can handle it
if (($errno & E_WARNING) === 0 && ($errno & E_NOTICE) === 0) {
// Return false to indicate the default error handler should engage
return false;
}
$this->connect_error .= $errstr . "\n";
return true;
}
/**
* Verify the certificate against common name and subject alternative names
*
* Unfortunately, PHP doesn't check the certificate against the alternative
* names, leading things like 'https://www.github.com/' to be invalid.
* Instead
*
* @link https://tools.ietf.org/html/rfc2818#section-3.1 RFC2818, Section 3.1
*
* @param string $host Host name to verify against
* @param resource $context Stream context
* @return bool
*
* @throws \WpOrg\Requests\Exception On failure to connect via TLS (`fsockopen.ssl.connect_error`)
* @throws \WpOrg\Requests\Exception On not obtaining a match for the host (`fsockopen.ssl.no_match`)
*/
public function verify_certificate_from_context($host, $context) {
$meta = stream_context_get_options($context);
// If we don't have SSL options, then we couldn't make the connection at
// all
if (empty($meta) || empty($meta['ssl']) || empty($meta['ssl']['peer_certificate'])) {
throw new Exception(rtrim($this->connect_error), 'ssl.connect_error');
}
$cert = openssl_x509_parse($meta['ssl']['peer_certificate']);
return Ssl::verify_certificate($host, $cert);
}
/**
* Self-test whether the transport can be used.
*
* The available capabilities to test for can be found in {@see \WpOrg\Requests\Capability}.
*
* @codeCoverageIgnore
* @param array<string, bool> $capabilities Optional. Associative array of capabilities to test against, i.e. `['<capability>' => true]`.
* @return bool Whether the transport can be used.
*/
public static function test($capabilities = []) {
if (!function_exists('fsockopen')) {
return false;
}
// If needed, check that streams support SSL
if (isset($capabilities[Capability::SSL]) && $capabilities[Capability::SSL]) {
if (!extension_loaded('openssl') || !function_exists('openssl_x509_parse')) {
return false;
}
}
return true;
}
}