<?php

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/**

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* fsockopen HTTP transport

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*

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* @package Requests\Transport

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*/

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namespace WpOrg\Requests\Transport;

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use WpOrg\Requests\Capability;

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use WpOrg\Requests\Exception;

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use WpOrg\Requests\Exception\InvalidArgument;

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use WpOrg\Requests\Port;

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use WpOrg\Requests\Requests;

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use WpOrg\Requests\Ssl;

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use WpOrg\Requests\Transport;

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use WpOrg\Requests\Utility\CaseInsensitiveDictionary;

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use WpOrg\Requests\Utility\InputValidator;

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/**

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* fsockopen HTTP transport

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*

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* @package Requests\Transport

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*/

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final class Fsockopen implements Transport {

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/**

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* Second to microsecond conversion

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*

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* @var integer

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*/

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const SECOND_IN_MICROSECONDS = 1000000;

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/**

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* Raw HTTP data

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*

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* @var string

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*/

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public $headers = '';

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/**

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* Stream metadata

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*

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* @var array Associative array of properties, see {@link https://www.php.net/stream_get_meta_data}

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*/

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public $info;

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/**

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* What's the maximum number of bytes we should keep?

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*

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* @var int|bool Byte count, or false if no limit.

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*/

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private $max_bytes = false;

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/**

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* Cache for received connection errors.

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*

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* @var string

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*/

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private $connect_error = '';

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/**

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* Perform a request

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*

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* @param string|Stringable $url URL to request

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* @param array $headers Associative array of request headers

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* @param string|array $data Data to send either as the POST body, or as parameters in the URL for a GET/HEAD

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* @param array $options Request options, see {@see \WpOrg\Requests\Requests::response()} for documentation

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* @return string Raw HTTP result

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*

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* @throws \WpOrg\Requests\Exception\InvalidArgument When the passed $url argument is not a string or Stringable.

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* @throws \WpOrg\Requests\Exception\InvalidArgument When the passed $headers argument is not an array.

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* @throws \WpOrg\Requests\Exception\InvalidArgument When the passed $data parameter is not an array or string.

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* @throws \WpOrg\Requests\Exception\InvalidArgument When the passed $options argument is not an array.

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* @throws \WpOrg\Requests\Exception On failure to connect to socket (`fsockopenerror`)

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* @throws \WpOrg\Requests\Exception On socket timeout (`timeout`)

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*/

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public function request($url, $headers = [], $data = [], $options = []) {

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if (InputValidator::is_string_or_stringable($url) === false) {

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throw InvalidArgument::create(1, '$url', 'string|Stringable', gettype($url));

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}

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if (is_array($headers) === false) {

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throw InvalidArgument::create(2, '$headers', 'array', gettype($headers));

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}

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if (!is_array($data) && !is_string($data)) {

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if ($data === null) {

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$data = '';

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} else {

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throw InvalidArgument::create(3, '$data', 'array|string', gettype($data));

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}

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}

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if (is_array($options) === false) {

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throw InvalidArgument::create(4, '$options', 'array', gettype($options));

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}

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$options['hooks']->dispatch('fsockopen.before_request');

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$url_parts = parse_url($url);

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if (empty($url_parts)) {

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throw new Exception('Invalid URL.', 'invalidurl', $url);

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}

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$host = $url_parts['host'];

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$context = stream_context_create();

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$verifyname = false;

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$case_insensitive_headers = new CaseInsensitiveDictionary($headers);

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// HTTPS support

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if (isset($url_parts['scheme']) && strtolower($url_parts['scheme']) === 'https') {

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$remote_socket = 'ssl://' . $host;

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if (!isset($url_parts['port'])) {

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$url_parts['port'] = Port::HTTPS;

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}

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$context_options = [

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'verify_peer' => true,

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'capture_peer_cert' => true,

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];

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$verifyname = true;

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// SNI, if enabled (OpenSSL >=0.9.8j)

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// phpcs:ignore PHPCompatibility.Constants.NewConstants.openssl_tlsext_server_nameFound

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if (defined('OPENSSL_TLSEXT_SERVER_NAME') && OPENSSL_TLSEXT_SERVER_NAME) {

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$context_options['SNI_enabled'] = true;

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if (isset($options['verifyname']) && $options['verifyname'] === false) {

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$context_options['SNI_enabled'] = false;

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}

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}

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if (isset($options['verify'])) {

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if ($options['verify'] === false) {

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$context_options['verify_peer'] = false;

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$context_options['verify_peer_name'] = false;

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$verifyname = false;

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} elseif (is_string($options['verify'])) {

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$context_options['cafile'] = $options['verify'];

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}

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}

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if (isset($options['verifyname']) && $options['verifyname'] === false) {

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$context_options['verify_peer_name'] = false;

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$verifyname = false;

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}

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// Handle the PHP 8.4 deprecation (PHP 9.0 removal) of the function signature we use for stream_context_set_option().

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// Ref: https://wiki.php.net/rfc/deprecate_functions_with_overloaded_signatures#stream_context_set_option

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if (function_exists('stream_context_set_options')) {

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// PHP 8.3+.

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stream_context_set_options($context, ['ssl' => $context_options]);

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} else {

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// PHP < 8.3.

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stream_context_set_option($context, ['ssl' => $context_options]);

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}

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} else {

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$remote_socket = 'tcp://' . $host;

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}

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$this->max_bytes = $options['max_bytes'];

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if (!isset($url_parts['port'])) {

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$url_parts['port'] = Port::HTTP;

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}

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$remote_socket .= ':' . $url_parts['port'];

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// phpcs:ignore WordPress.PHP.DevelopmentFunctions.error_log_set_error_handler

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set_error_handler([$this, 'connect_error_handler'], E_WARNING | E_NOTICE);

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$options['hooks']->dispatch('fsockopen.remote_socket', [&$remote_socket]);

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$socket = stream_socket_client($remote_socket, $errno, $errstr, ceil($options['connect_timeout']), STREAM_CLIENT_CONNECT, $context);

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restore_error_handler();

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if ($verifyname && !$this->verify_certificate_from_context($host, $context)) {

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throw new Exception('SSL certificate did not match the requested domain name', 'ssl.no_match');

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}

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if (!$socket) {

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if ($errno === 0) {

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// Connection issue

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throw new Exception(rtrim($this->connect_error), 'fsockopen.connect_error');

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}

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throw new Exception($errstr, 'fsockopenerror', null, $errno);

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}

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$data_format = $options['data_format'];

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if ($data_format === 'query') {

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$path = self::format_get($url_parts, $data);

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$data = '';

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} else {

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$path = self::format_get($url_parts, []);

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}

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$options['hooks']->dispatch('fsockopen.remote_host_path', [&$path, $url]);

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$request_body = '';

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$out = sprintf("%s %s HTTP/%.1F\r\n", $options['type'], $path, $options['protocol_version']);

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if ($options['type'] !== Requests::TRACE) {

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if (is_array($data)) {

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$request_body = http_build_query($data, '', '&');

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} else {

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$request_body = $data;

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}

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// Always include Content-length on POST requests to prevent

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// 411 errors from some servers when the body is empty.

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if (!empty($data) || $options['type'] === Requests::POST) {

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if (!isset($case_insensitive_headers['Content-Length'])) {

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$headers['Content-Length'] = strlen($request_body);

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}

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if (!isset($case_insensitive_headers['Content-Type'])) {

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$headers['Content-Type'] = 'application/x-www-form-urlencoded; charset=UTF-8';

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}

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}

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}

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if (!isset($case_insensitive_headers['Host'])) {

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$out .= sprintf('Host: %s', $url_parts['host']);

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$scheme_lower = strtolower($url_parts['scheme']);

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if (($scheme_lower === 'http' && $url_parts['port'] !== Port::HTTP) || ($scheme_lower === 'https' && $url_parts['port'] !== Port::HTTPS)) {

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$out .= ':' . $url_parts['port'];

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}

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$out .= "\r\n";

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}

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if (!isset($case_insensitive_headers['User-Agent'])) {

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$out .= sprintf("User-Agent: %s\r\n", $options['useragent']);

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}

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$accept_encoding = $this->accept_encoding();

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if (!isset($case_insensitive_headers['Accept-Encoding']) && !empty($accept_encoding)) {

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$out .= sprintf("Accept-Encoding: %s\r\n", $accept_encoding);

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}

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$headers = Requests::flatten($headers);

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if (!empty($headers)) {

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$out .= implode("\r\n", $headers) . "\r\n";

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}

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$options['hooks']->dispatch('fsockopen.after_headers', [&$out]);

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if (substr($out, -2) !== "\r\n") {

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$out .= "\r\n";

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}

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if (!isset($case_insensitive_headers['Connection'])) {

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$out .= "Connection: Close\r\n";

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}

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$out .= "\r\n" . $request_body;

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$options['hooks']->dispatch('fsockopen.before_send', [&$out]);

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fwrite($socket, $out);

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$options['hooks']->dispatch('fsockopen.after_send', [$out]);

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if (!$options['blocking']) {

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fclose($socket);

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$fake_headers = '';

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$options['hooks']->dispatch('fsockopen.after_request', [&$fake_headers]);

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return '';

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}

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$timeout_sec = (int) floor($options['timeout']);

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if ($timeout_sec === $options['timeout']) {

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$timeout_msec = 0;

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} else {

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$timeout_msec = self::SECOND_IN_MICROSECONDS * $options['timeout'] % self::SECOND_IN_MICROSECONDS;

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}

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stream_set_timeout($socket, $timeout_sec, $timeout_msec);

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$response = '';

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$body = '';

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$headers = '';

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$this->info = stream_get_meta_data($socket);

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$size = 0;

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$doingbody = false;

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$download = false;

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if ($options['filename']) {

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// phpcs:ignore WordPress.PHP.NoSilencedErrors -- Silenced the PHP native warning in favour of throwing an exception.

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$download = @fopen($options['filename'], 'wb');

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if ($download === false) {

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$error = error_get_last();

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throw new Exception($error['message'], 'fopen');

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}

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}

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while (!feof($socket)) {

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$this->info = stream_get_meta_data($socket);

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if ($this->info['timed_out']) {

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throw new Exception('fsocket timed out', 'timeout');

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}

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$block = fread($socket, Requests::BUFFER_SIZE);

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if (!$doingbody) {

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$response .= $block;

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if (strpos($response, "\r\n\r\n")) {

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list($headers, $block) = explode("\r\n\r\n", $response, 2);

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$doingbody = true;

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}

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}

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// Are we in body mode now?

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if ($doingbody) {

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$options['hooks']->dispatch('request.progress', [$block, $size, $this->max_bytes]);

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$data_length = strlen($block);

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if ($this->max_bytes) {

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// Have we already hit a limit?

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if ($size === $this->max_bytes) {

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continue;

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}

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if (($size + $data_length) > $this->max_bytes) {

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// Limit the length

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$limited_length = ($this->max_bytes - $size);

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$block = substr($block, 0, $limited_length);

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}

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}

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$size += strlen($block);

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if ($download) {

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fwrite($download, $block);

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} else {

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$body .= $block;

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}

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}

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}

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$this->headers = $headers;

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if ($download) {

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fclose($download);

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} else {

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$this->headers .= "\r\n\r\n" . $body;

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}

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fclose($socket);

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$options['hooks']->dispatch('fsockopen.after_request', [&$this->headers, &$this->info]);

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return $this->headers;

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}

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[352] Fix | Delete

/**

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* Send multiple requests simultaneously

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*

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* @param array $requests Request data (array of 'url', 'headers', 'data', 'options') as per {@see \WpOrg\Requests\Transport::request()}

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* @param array $options Global options, see {@see \WpOrg\Requests\Requests::response()} for documentation

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* @return array Array of \WpOrg\Requests\Response objects (may contain \WpOrg\Requests\Exception or string responses as well)

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*

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* @throws \WpOrg\Requests\Exception\InvalidArgument When the passed $requests argument is not an array or iterable object with array access.

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* @throws \WpOrg\Requests\Exception\InvalidArgument When the passed $options argument is not an array.

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*/

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public function request_multiple($requests, $options) {

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// If you're not requesting, we can't get any responses ¯\_(ツ)_/¯

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if (empty($requests)) {

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return [];

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}

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if (InputValidator::has_array_access($requests) === false || InputValidator::is_iterable($requests) === false) {

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throw InvalidArgument::create(1, '$requests', 'array|ArrayAccess&Traversable', gettype($requests));

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}

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if (is_array($options) === false) {

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throw InvalidArgument::create(2, '$options', 'array', gettype($options));

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}

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$responses = [];

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$class = get_class($this);

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foreach ($requests as $id => $request) {

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try {

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$handler = new $class();

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$responses[$id] = $handler->request($request['url'], $request['headers'], $request['data'], $request['options']);

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$request['options']['hooks']->dispatch('transport.internal.parse_response', [&$responses[$id], $request]);

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} catch (Exception $e) {

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$responses[$id] = $e;

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}

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if (!is_string($responses[$id])) {

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$request['options']['hooks']->dispatch('multiple.request.complete', [&$responses[$id], $id]);

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}

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}

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return $responses;

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}

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/**

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* Retrieve the encodings we can accept

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*

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* @return string Accept-Encoding header value

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*/

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private static function accept_encoding() {

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$type = [];

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if (function_exists('gzinflate')) {

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$type[] = 'deflate;q=1.0';

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}

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if (function_exists('gzuncompress')) {

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$type[] = 'compress;q=0.5';

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}

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$type[] = 'gzip;q=0.5';

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return implode(', ', $type);

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}

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/**

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* Format a URL given GET data

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*

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* @param array $url_parts Array of URL parts as received from {@link https://www.php.net/parse_url}

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* @param array|object $data Data to build query using, see {@link https://www.php.net/http_build_query}

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* @return string URL with data

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*/

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private static function format_get($url_parts, $data) {

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if (!empty($data)) {

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if (empty($url_parts['query'])) {

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$url_parts['query'] = '';

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}

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$url_parts['query'] .= '&' . http_build_query($data, '', '&');

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$url_parts['query'] = trim($url_parts['query'], '&');

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}

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if (isset($url_parts['path'])) {

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if (isset($url_parts['query'])) {

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$get = $url_parts['path'] . '?' . $url_parts['query'];

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} else {

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$get = $url_parts['path'];

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}

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} else {

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$get = '/';

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}

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return $get;

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}

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/**

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* Error handler for stream_socket_client()

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*

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* @param int $errno Error number (e.g. E_WARNING)

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* @param string $errstr Error message

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*/

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public function connect_error_handler($errno, $errstr) {

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// Double-check we can handle it

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if (($errno & E_WARNING) === 0 && ($errno & E_NOTICE) === 0) {

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// Return false to indicate the default error handler should engage

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return false;

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}

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$this->connect_error .= $errstr . "\n";

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return true;

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}

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[463] Fix | Delete

/**

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* Verify the certificate against common name and subject alternative names

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*

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* Unfortunately, PHP doesn't check the certificate against the alternative

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* names, leading things like 'https://www.github.com/' to be invalid.

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* Instead

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*

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* @link https://tools.ietf.org/html/rfc2818#section-3.1 RFC2818, Section 3.1

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*

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* @param string $host Host name to verify against

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* @param resource $context Stream context

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* @return bool

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*

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* @throws \WpOrg\Requests\Exception On failure to connect via TLS (`fsockopen.ssl.connect_error`)

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* @throws \WpOrg\Requests\Exception On not obtaining a match for the host (`fsockopen.ssl.no_match`)

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*/

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public function verify_certificate_from_context($host, $context) {

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$meta = stream_context_get_options($context);

[481] Fix | Delete

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// If we don't have SSL options, then we couldn't make the connection at

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// all

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if (empty($meta) || empty($meta['ssl']) || empty($meta['ssl']['peer_certificate'])) {

[485] Fix | Delete

throw new Exception(rtrim($this->connect_error), 'ssl.connect_error');

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}

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$cert = openssl_x509_parse($meta['ssl']['peer_certificate']);

[489] Fix | Delete

[490] Fix | Delete

return Ssl::verify_certificate($host, $cert);

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}

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[493] Fix | Delete

/**

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* Self-test whether the transport can be used.

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*

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* The available capabilities to test for can be found in {@see \WpOrg\Requests\Capability}.

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*

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* @codeCoverageIgnore

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