<?php

/**
 * Requests for PHP
 *
 * Inspired by Requests for Python.
 *
 * Based on concepts from SimplePie_File, RequestCore and WP_Http.
 *
 * @package Requests
 */
namespace VendorDuplicator\WpOrg\Requests;

use VendorDuplicator\WpOrg\Requests\Auth\Basic;
use VendorDuplicator\WpOrg\Requests\Capability;
use VendorDuplicator\WpOrg\Requests\Cookie\Jar;
use VendorDuplicator\WpOrg\Requests\Exception;
use VendorDuplicator\WpOrg\Requests\Exception\InvalidArgument;
use VendorDuplicator\WpOrg\Requests\Hooks;
use VendorDuplicator\WpOrg\Requests\IdnaEncoder;
use VendorDuplicator\WpOrg\Requests\Iri;
use VendorDuplicator\WpOrg\Requests\Proxy\Http;
use VendorDuplicator\WpOrg\Requests\Response;
use VendorDuplicator\WpOrg\Requests\Transport\Curl;
use VendorDuplicator\WpOrg\Requests\Transport\Fsockopen;
use VendorDuplicator\WpOrg\Requests\Utility\InputValidator;
/**
 * Requests for PHP
 *
 * Inspired by Requests for Python.
 *
 * Based on concepts from SimplePie_File, RequestCore and WP_Http.
 *
 * @package Requests
 */
class Requests
{
    /**
     * POST method
     *
     * @var string
     */
    const POST = 'POST';
    /**
     * PUT method
     *
     * @var string
     */
    const PUT = 'PUT';
    /**
     * GET method
     *
     * @var string
     */
    const GET = 'GET';
    /**
     * HEAD method
     *
     * @var string
     */
    const HEAD = 'HEAD';
    /**
     * DELETE method
     *
     * @var string
     */
    const DELETE = 'DELETE';
    /**
     * OPTIONS method
     *
     * @var string
     */
    const OPTIONS = 'OPTIONS';
    /**
     * TRACE method
     *
     * @var string
     */
    const TRACE = 'TRACE';
    /**
     * PATCH method
     *
     * @link https://tools.ietf.org/html/rfc5789
     * @var string
     */
    const PATCH = 'PATCH';
    /**
     * Default size of buffer size to read streams
     *
     * @var integer
     */
    const BUFFER_SIZE = 1160;
    /**
     * Option defaults.
     *
     * @see \VendorDuplicator\WpOrg\Requests\Requests::get_default_options()
     * @see \VendorDuplicator\WpOrg\Requests\Requests::request() for values returned by this method
     *
     * @since 2.0.0
     *
     * @var array
     */
    const OPTION_DEFAULTS = ['timeout' => 10, 'connect_timeout' => 10, 'useragent' => 'php-requests/' . self::VERSION, 'protocol_version' => 1.1, 'redirected' => 0, 'redirects' => 10, 'follow_redirects' => \true, 'blocking' => \true, 'type' => self::GET, 'filename' => \false, 'auth' => \false, 'proxy' => \false, 'cookies' => \false, 'max_bytes' => \false, 'idn' => \true, 'hooks' => null, 'transport' => null, 'verify' => null, 'verifyname' => \true];
    /**
     * Default supported Transport classes.
     *
     * @since 2.0.0
     *
     * @var array
     */
    const DEFAULT_TRANSPORTS = [Curl::class => Curl::class, Fsockopen::class => Fsockopen::class];
    /**
     * Current version of Requests
     *
     * @var string
     */
    const VERSION = '2.0.15';
    /**
     * Selected transport name
     *
     * Use {@see \WpOrg\Requests\Requests::get_transport()} instead
     *
     * @var array
     */
    public static $transport = [];
    /**
     * Registered transport classes
     *
     * @var array
     */
    protected static $transports = [];
    /**
     * Default certificate path.
     *
     * @see \VendorDuplicator\WpOrg\Requests\Requests::get_certificate_path()
     * @see \VendorDuplicator\WpOrg\Requests\Requests::set_certificate_path()
     *
     * @var string
     */
    protected static $certificate_path = __DIR__ . '/../certificates/cacert.pem';
    /**
     * All (known) valid deflate, gzip header magic markers.
     *
     * These markers relate to different compression levels.
     *
     * @link https://stackoverflow.com/a/43170354/482864 Marker source.
     *
     * @since 2.0.0
     *
     * @var array
     */
    private static $magic_compression_headers = [
        "\x1f\x8b" => \true,
        // Gzip marker.
        "x\x01" => \true,
        // Zlib marker - level 1.
        "x^" => \true,
        // Zlib marker - level 2 to 5.
        "x\x9c" => \true,
        // Zlib marker - level 6.
        "x\xda" => \true,
    ];
    /**
     * This is a static class, do not instantiate it
     *
     * @codeCoverageIgnore
     */
    private function __construct()
    {
    }
    /**
     * Register a transport
     *
     * @param string $transport Transport class to add, must support the \WpOrg\Requests\Transport interface
     */
    public static function add_transport($transport)
    {
        if (empty(self::$transports)) {
            self::$transports = self::DEFAULT_TRANSPORTS;
        }
        self::$transports[$transport] = $transport;
    }
    /**
     * Get the fully qualified class name (FQCN) for a working transport.
     *
     * @param array<string, bool> $capabilities Optional. Associative array of capabilities to test against, i.e. `['<capability>' => true]`.
     * @return string FQCN of the transport to use, or an empty string if no transport was
     *                found which provided the requested capabilities.
     */
    protected static function get_transport_class(array $capabilities = [])
    {
        // Caching code, don't bother testing coverage.
        // @codeCoverageIgnoreStart
        // Array of capabilities as a string to be used as an array key.
        ksort($capabilities);
        $cap_string = serialize($capabilities);
        // Don't search for a transport if it's already been done for these $capabilities.
        if (isset(self::$transport[$cap_string])) {
            return self::$transport[$cap_string];
        }
        // Ensure we will not run this same check again later on.
        self::$transport[$cap_string] = '';
        // @codeCoverageIgnoreEnd
        if (empty(self::$transports)) {
            self::$transports = self::DEFAULT_TRANSPORTS;
        }
        // Find us a working transport.
        foreach (self::$transports as $class) {
            if (!class_exists($class)) {
                continue;
            }
            $result = $class::test($capabilities);
            if ($result === \true) {
                self::$transport[$cap_string] = $class;
                break;
            }
        }
        return self::$transport[$cap_string];
    }
    /**
     * Get a working transport.
     *
     * @param array<string, bool> $capabilities Optional. Associative array of capabilities to test against, i.e. `['<capability>' => true]`.
     * @return \VendorDuplicator\WpOrg\Requests\Transport
     * @throws \VendorDuplicator\WpOrg\Requests\Exception If no valid transport is found (`notransport`).
     */
    protected static function get_transport(array $capabilities = [])
    {
        $class = self::get_transport_class($capabilities);
        if ($class === '') {
            throw new Exception('No working transports found', 'notransport', self::$transports);
        }
        return new $class();
    }
    /**
     * Checks to see if we have a transport for the capabilities requested.
     *
     * Supported capabilities can be found in the {@see \WpOrg\Requests\Capability}
     * interface as constants.
     *
     * Example usage:
     * `Requests::has_capabilities([Capability::SSL => true])`.
     *
     * @param array<string, bool> $capabilities Optional. Associative array of capabilities to test against, i.e. `['<capability>' => true]`.
     * @return bool Whether the transport has the requested capabilities.
     */
    public static function has_capabilities(array $capabilities = [])
    {
        return self::get_transport_class($capabilities) !== '';
    }
    /**#@+
     * @see \VendorDuplicator\WpOrg\Requests\Requests::request()
     * @param string $url
     * @param array $headers
     * @param array $options
     * @return \VendorDuplicator\WpOrg\Requests\Response
     */
    /**
     * Send a GET request
     */
    public static function get($url, $headers = [], $options = [])
    {
        return self::request($url, $headers, null, self::GET, $options);
    }
    /**
     * Send a HEAD request
     */
    public static function head($url, $headers = [], $options = [])
    {
        return self::request($url, $headers, null, self::HEAD, $options);
    }
    /**
     * Send a DELETE request
     */
    public static function delete($url, $headers = [], $options = [])
    {
        return self::request($url, $headers, null, self::DELETE, $options);
    }
    /**
     * Send a TRACE request
     */
    public static function trace($url, $headers = [], $options = [])
    {
        return self::request($url, $headers, null, self::TRACE, $options);
    }
    /**#@-*/
    /**#@+
     * @see \VendorDuplicator\WpOrg\Requests\Requests::request()
     * @param string $url
     * @param array $headers
     * @param array $data
     * @param array $options
     * @return \VendorDuplicator\WpOrg\Requests\Response
     */
    /**
     * Send a POST request
     */
    public static function post($url, $headers = [], $data = [], $options = [])
    {
        return self::request($url, $headers, $data, self::POST, $options);
    }
    /**
     * Send a PUT request
     */
    public static function put($url, $headers = [], $data = [], $options = [])
    {
        return self::request($url, $headers, $data, self::PUT, $options);
    }
    /**
     * Send an OPTIONS request
     */
    public static function options($url, $headers = [], $data = [], $options = [])
    {
        return self::request($url, $headers, $data, self::OPTIONS, $options);
    }
    /**
     * Send a PATCH request
     *
     * Note: Unlike {@see \WpOrg\Requests\Requests::post()} and {@see \WpOrg\Requests\Requests::put()},
     * `$headers` is required, as the specification recommends that should send an ETag
     *
     * @link https://tools.ietf.org/html/rfc5789
     */
    public static function patch($url, $headers, $data = [], $options = [])
    {
        return self::request($url, $headers, $data, self::PATCH, $options);
    }
    /**#@-*/
    /**
     * Main interface for HTTP requests
     *
     * This method initiates a request and sends it via a transport before
     * parsing.
     *
     * The `$options` parameter takes an associative array with the following
     * options:
     *
     * - `timeout`: How long should we wait for a response?
     *    Note: for cURL, a minimum of 1 second applies, as DNS resolution
     *    operates at second-resolution only.
     *    (float, seconds with a millisecond precision, default: 10, example: 0.01)
     * - `connect_timeout`: How long should we wait while trying to connect?
     *    (float, seconds with a millisecond precision, default: 10, example: 0.01)
     * - `useragent`: Useragent to send to the server
     *    (string, default: php-requests/$version)
     * - `follow_redirects`: Should we follow 3xx redirects?
     *    (boolean, default: true)
     * - `redirects`: How many times should we redirect before erroring?
     *    (integer, default: 10)
     * - `blocking`: Should we block processing on this request?
     *    (boolean, default: true)
     * - `filename`: File to stream the body to instead.
     *    (string|boolean, default: false)
     * - `auth`: Authentication handler or array of user/password details to use
     *    for Basic authentication
     *    (\WpOrg\Requests\Auth|array|boolean, default: false)
     * - `proxy`: Proxy details to use for proxy by-passing and authentication
     *    (\WpOrg\Requests\Proxy|array|string|boolean, default: false)
     * - `max_bytes`: Limit for the response body size.
     *    (integer|boolean, default: false)
     * - `idn`: Enable IDN parsing
     *    (boolean, default: true)
     * - `transport`: Custom transport. Either a class name, or a
     *    transport object. Defaults to the first working transport from
     *    {@see \WpOrg\Requests\Requests::getTransport()}
     *    (string|\WpOrg\Requests\Transport, default: {@see \WpOrg\Requests\Requests::getTransport()})
     * - `hooks`: Hooks handler.
     *    (\WpOrg\Requests\HookManager, default: new WpOrg\Requests\Hooks())
     * - `verify`: Should we verify SSL certificates? Allows passing in a custom
     *    certificate file as a string. (Using true uses the system-wide root
     *    certificate store instead, but this may have different behaviour
     *    across transports.)
     *    (string|boolean, default: certificates/cacert.pem)
     * - `verifyname`: Should we verify the common name in the SSL certificate?
     *    (boolean, default: true)
     * - `data_format`: How should we send the `$data` parameter?
     *    (string, one of 'query' or 'body', default: 'query' for
     *    HEAD/GET/DELETE, 'body' for POST/PUT/OPTIONS/PATCH)
     *
     * @param string|Stringable $url URL to request
     * @param array $headers Extra headers to send with the request
     * @param array|null $data Data to send either as a query string for GET/HEAD requests, or in the body for POST requests
     * @param string $type HTTP request type (use Requests constants)
     * @param array $options Options for the request (see description for more information)
     * @return \VendorDuplicator\WpOrg\Requests\Response
     *
     * @throws \VendorDuplicator\WpOrg\Requests\Exception\InvalidArgument When the passed $url argument is not a string or Stringable.
     * @throws \VendorDuplicator\WpOrg\Requests\Exception\InvalidArgument When the passed $type argument is not a string.
     * @throws \VendorDuplicator\WpOrg\Requests\Exception\InvalidArgument When the passed $options argument is not an array.
     * @throws \VendorDuplicator\WpOrg\Requests\Exception On invalid URLs (`nonhttp`)
     */
    public static function request($url, $headers = [], $data = [], $type = self::GET, $options = [])
    {
        if (InputValidator::is_string_or_stringable($url) === \false) {
            throw InvalidArgument::create(1, '$url', 'string|Stringable', gettype($url));
        }
        if (is_string($type) === \false) {
            throw InvalidArgument::create(4, '$type', 'string', gettype($type));
        }
        if (is_array($options) === \false) {
            throw InvalidArgument::create(5, '$options', 'array', gettype($options));
        }
        if (empty($options['type'])) {
            $options['type'] = $type;
        }
        $options = array_merge(self::get_default_options(), $options);
        self::set_defaults($url, $headers, $data, $type, $options);
        $options['hooks']->dispatch('requests.before_request', [&$url, &$headers, &$data, &$type, &$options]);
        if (!empty($options['transport'])) {
            $transport = $options['transport'];
            if (is_string($options['transport'])) {
                $transport = new $transport();
            }
        } else {
            $need_ssl = stripos($url, 'https://') === 0;
            $capabilities = [Capability::SSL => $need_ssl];
            $transport = self::get_transport($capabilities);
        }
        $response = $transport->request($url, $headers, $data, $options);
        $options['hooks']->dispatch('requests.before_parse', [&$response, $url, $headers, $data, $type, $options]);
        return self::parse_response($response, $url, $headers, $data, $options);
    }
    /**
     * Send multiple HTTP requests simultaneously
     *
     * The `$requests` parameter takes an associative or indexed array of
     * request fields. The key of each request can be used to match up the
     * request with the returned data, or with the request passed into your
     * `multiple.request.complete` callback.
     *
     * The request fields value is an associative array with the following keys:
     *
     * - `url`: Request URL Same as the `$url` parameter to
     *    {@see \WpOrg\Requests\Requests::request()}
     *    (string, required)
     * - `headers`: Associative array of header fields. Same as the `$headers`
     *    parameter to {@see \WpOrg\Requests\Requests::request()}
     *    (array, default: `array()`)
     * - `data`: Associative array of data fields or a string. Same as the
     *    `$data` parameter to {@see \WpOrg\Requests\Requests::request()}
     *    (array|string, default: `array()`)
     * - `type`: HTTP request type (use \WpOrg\Requests\Requests constants). Same as the `$type`
     *    parameter to {@see \WpOrg\Requests\Requests::request()}
     *    (string, default: `\WpOrg\Requests\Requests::GET`)
     * - `cookies`: Associative array of cookie name to value, or cookie jar.
     *    (array|\WpOrg\Requests\Cookie\Jar)
     *
     * If the `$options` parameter is specified, individual requests will
     * inherit options from it. This can be used to use a single hooking system,
     * or set all the types to `\WpOrg\Requests\Requests::POST`, for example.
     *
     * In addition, the `$options` parameter takes the following global options:
     *
     * - `complete`: A callback for when a request is complete. Takes two
     *    parameters, a \WpOrg\Requests\Response/\WpOrg\Requests\Exception reference, and the
     *    ID from the request array (Note: this can also be overridden on a
     *    per-request basis, although that's a little silly)
     *    (callback)
     *
     * @param array $requests Requests data (see description for more information)
     * @param array $options Global and default options (see {@see \WpOrg\Requests\Requests::request()})
     * @return array Responses (either \WpOrg\Requests\Response or a \WpOrg\Requests\Exception object)
     *
     * @throws \VendorDuplicator\WpOrg\Requests\Exception\InvalidArgument When the passed $requests argument is not an array or iterable object with array access.
     * @throws \VendorDuplicator\WpOrg\Requests\Exception\InvalidArgument When the passed $options argument is not an array.
     */
    public static function request_multiple($requests, $options = [])
    {
        if (InputValidator::has_array_access($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));
        }
        $options = array_merge(self::get_default_options(\true), $options);
        if (!empty($options['hooks'])) {
            $options['hooks']->register('transport.internal.parse_response', [static::class, 'parse_multiple']);
            if (!empty($options['complete'])) {
                $options['hooks']->register('multiple.request.complete', $options['complete']);
            }
        }
        foreach ($requests as $id => &$request) {
            if (!isset($request['headers'])) {
                $request['headers'] = [];
            }
            if (!isset($request['data'])) {
                $request['data'] = [];
            }
            if (!isset($request['type'])) {
                $request['type'] = self::GET;
            }
            if (!isset($request['options'])) {
                $request['options'] = $options;
                $request['options']['type'] = $request['type'];
            } else {
                if (empty($request['options']['type'])) {
                    $request['options']['type'] = $request['type'];
                }
                $request['options'] = array_merge($options, $request['options']);
            }
            self::set_defaults($request['url'], $request['headers'], $request['data'], $request['type'], $request['options']);
            // Ensure we only hook in once
            if ($request['options']['hooks'] !== $options['hooks']) {
                $request['options']['hooks']->register('transport.internal.parse_response', [static::class, 'parse_multiple']);
                if (!empty($request['options']['complete'])) {
                    $request['options']['hooks']->register('multiple.request.complete', $request['options']['complete']);
                }
            }
        }
        unset($request);
        if (!empty($options['transport'])) {
            $transport = $options['transport'];
            if (is_string($options['transport'])) {
                $transport = new $transport();
            }
        } else {
            $transport = self::get_transport();
        }
        $responses = $transport->request_multiple($requests, $options);
        foreach ($responses as $id => &$response) {
            // If our hook got messed with somehow, ensure we end up with the
            // correct response
            if (is_string($response)) {
                $request = $requests[$id];
                self::parse_multiple($response, $request);
                $request['options']['hooks']->dispatch('multiple.request.complete', [&$response, $id]);
            }
        }
        return $responses;
    }
    /**
     * Get the default options
     *
     * @see \VendorDuplicator\WpOrg\Requests\Requests::request() for values returned by this method
     * @param boolean $multirequest Is this a multirequest?
     * @return array Default option values
     */
    protected static function get_default_options($multirequest = \false)
    {
        $defaults = static::OPTION_DEFAULTS;
        $defaults['verify'] = self::$certificate_path;
        if ($multirequest !== \false) {
            $defaults['complete'] = null;
        }
        return $defaults;
    }
    /**
     * Get default certificate path.
     *
     * @return string Default certificate path.
     */
    public static function get_certificate_path()
    {
        return self::$certificate_path;
    }
    /**
     * Set default certificate path.
     *
     * @param string|Stringable|bool $path Certificate path, pointing to a PEM file.
     *
     * @throws \VendorDuplicator\WpOrg\Requests\Exception\InvalidArgument When the passed $url argument is not a string, Stringable or boolean.
     */
    public static function set_certificate_path($path)
    {
        if (InputValidator::is_string_or_stringable($path) === \false && is_bool($path) === \false) {
            throw InvalidArgument::create(1, '$path', 'string|Stringable|bool', gettype($path));
        }
        self::$certificate_path = $path;
    }
    /**
     * Set the default values
     *
     * The $options parameter is updated with the results.
     *
     * @param string $url URL to request
     * @param array $headers Extra headers to send with the request
     * @param array|null $data Data to send either as a query string for GET/HEAD requests, or in the body for POST requests
     * @param string $type HTTP request type
     * @param array $options Options for the request
     * @return void
     *
     * @throws \VendorDuplicator\WpOrg\Requests\Exception When the $url is not an http(s) URL.
     */
    protected static function set_defaults(&$url, &$headers, &$data, &$type, &$options)
    {
        if (!preg_match('/^http(s)?:\/\//i', $url, $matches)) {
            throw new Exception('Only HTTP(S) requests are handled.', 'nonhttp', $url);
        }
        if (empty($options['hooks'])) {
            $options['hooks'] = new Hooks();
        }
        if (is_array($options['auth'])) {
            $options['auth'] = new Basic($options['auth']);
        }
        if ($options['auth'] !== \false) {
            $options['auth']->register($options['hooks']);
        }
        if (is_string($options['proxy']) || is_array($options['proxy'])) {
            $options['proxy'] = new Http($options['proxy']);
        }
        if ($options['proxy'] !== \false) {
            $options['proxy']->register($options['hooks']);
        }
        if (is_array($options['cookies'])) {
            $options['cookies'] = new Jar($options['cookies']);
        } elseif (empty($options['cookies'])) {
            $options['cookies'] = new Jar();
        }
        if ($options['cookies'] !== \false) {
            $options['cookies']->register($options['hooks']);
        }
        if ($options['idn'] !== \false) {
            $iri = new Iri($url);
            $iri->host = IdnaEncoder::encode($iri->ihost);
            $url = $iri->uri;
        }
        // Massage the type to ensure we support it.
        $type = strtoupper($type);
        if (!isset($options['data_format'])) {
            if (in_array($type, [self::HEAD, self::GET, self::DELETE], \true)) {
                $options['data_format'] = 'query';
            } else {
                $options['data_format'] = 'body';
            }
        }
    }
    /**
     * HTTP response parser
     *
     * @param string $headers Full response text including headers and body
     * @param string $url Original request URL
     * @param array $req_headers Original $headers array passed to {@link request()}, in case we need to follow redirects
     * @param array $req_data Original $data array passed to {@link request()}, in case we need to follow redirects
     * @param array $options Original $options array passed to {@link request()}, in case we need to follow redirects
     * @return \VendorDuplicator\WpOrg\Requests\Response
     *
     * @throws \VendorDuplicator\WpOrg\Requests\Exception On missing head/body separator (`requests.no_crlf_separator`)
     * @throws \VendorDuplicator\WpOrg\Requests\Exception On missing head/body separator (`noversion`)
     * @throws \VendorDuplicator\WpOrg\Requests\Exception On missing head/body separator (`toomanyredirects`)
     */
    protected static function parse_response($headers, $url, $req_headers, $req_data, $options)
    {
        $return = new Response();
        if (!$options['blocking']) {
            return $return;
        }
        $return->raw = $headers;
        $return->url = (string) $url;
        $return->body = '';
        if (!$options['filename']) {
            $pos = strpos($headers, "\r\n\r\n");
            if ($pos === \false) {
                // Crap!
                throw new Exception('Missing header/body separator', 'requests.no_crlf_separator');
            }
            $headers = substr($return->raw, 0, $pos);
            // Headers will always be separated from the body by two new lines - `\n\r\n\r`.
            $body = substr($return->raw, $pos + 4);
            if (!empty($body)) {
                $return->body = $body;
            }
        }
        // Pretend CRLF = LF for compatibility (RFC 2616, section 19.3)
        $headers = str_replace("\r\n", "\n", $headers);
        // Unfold headers (replace [CRLF] 1*( SP | HT ) with SP) as per RFC 2616 (section 2.2)
        $headers = preg_replace('/\n[ \t]/', ' ', $headers);
        $headers = explode("\n", $headers);
        preg_match('#^HTTP/(1\.\d)[ \t]+(\d+)#i', array_shift($headers), $matches);
        if (empty($matches)) {
            throw new Exception('Response could not be parsed', 'noversion', $headers);
        }
        $return->protocol_version = (float) $matches[1];
        $return->status_code = (int) $matches[2];
        if ($return->status_code >= 200 && $return->status_code < 300) {
            $return->success = \true;
        }
        foreach ($headers as $header) {
            list($key, $value) = explode(':', $header, 2);
            $value = trim($value);
            preg_replace('#(\s+)#i', ' ', $value);
            $return->headers[$key] = $value;
        }
        if (isset($return->headers['transfer-encoding'])) {
            $return->body = self::decode_chunked($return->body);
            unset($return->headers['transfer-encoding']);
        }
        if (isset($return->headers['content-encoding'])) {
            $return->body = self::decompress($return->body);
        }
        //fsockopen and cURL compatibility
        if (isset($return->headers['connection'])) {
            unset($return->headers['connection']);
        }
        $options['hooks']->dispatch('requests.before_redirect_check', [&$return, $req_headers, $req_data, $options]);
        if ($return->is_redirect() && $options['follow_redirects'] === \true) {
            if (isset($return->headers['location']) && $options['redirected'] < $options['redirects']) {
                if ($return->status_code === 303) {
                    $options['type'] = self::GET;
                }
                $options['redirected']++;
                $location = $return->headers['location'];
                if (strpos($location, 'http://') !== 0 && strpos($location, 'https://') !== 0) {
                    // relative redirect, for compatibility make it absolute
                    $location = Iri::absolutize($url, $location);
                    $location = $location->uri;
                }
                $hook_args = [&$location, &$req_headers, &$req_data, &$options, $return];
                $options['hooks']->dispatch('requests.before_redirect', $hook_args);
                $redirected = self::request($location, $req_headers, $req_data, $options['type'], $options);
                $redirected->history[] = $return;
                return $redirected;
            } elseif ($options['redirected'] >= $options['redirects']) {
                throw new Exception('Too many redirects', 'toomanyredirects', $return);
            }
        }
        $return->redirects = $options['redirected'];
        $options['hooks']->dispatch('requests.after_request', [&$return, $req_headers, $req_data, $options]);
        return $return;
    }
    /**
     * Callback for `transport.internal.parse_response`
     *
     * Internal use only. Converts a raw HTTP response to a \WpOrg\Requests\Response
     * while still executing a multiple request.
     *
     * `$response` is either set to a \WpOrg\Requests\Response instance, or a \WpOrg\Requests\Exception object
     *
     * @param string $response Full response text including headers and body (will be overwritten with Response instance)
     * @param array $request Request data as passed into {@see \WpOrg\Requests\Requests::request_multiple()}
     * @return void
     */
    public static function parse_multiple(&$response, $request)
    {
        try {
            $url = $request['url'];
            $headers = $request['headers'];
            $data = $request['data'];
            $options = $request['options'];
            $response = self::parse_response($response, $url, $headers, $data, $options);
        } catch (Exception $e) {
            $response = $e;
        }
    }
    /**
     * Decoded a chunked body as per RFC 2616
     *
     * @link https://tools.ietf.org/html/rfc2616#section-3.6.1
     * @param string $data Chunked body
     * @return string Decoded body
     */
    protected static function decode_chunked($data)
    {
        if (!preg_match('/^([0-9a-f]+)(?:;(?:[\w-]*)(?:=(?:(?:[\w-]*)*|"(?:[^\r\n])*"))?)*\r\n/i', trim($data))) {
            return $data;
        }
        $decoded = '';
        $encoded = $data;
        while (\true) {
            $is_chunked = (bool) preg_match('/^([0-9a-f]+)(?:;(?:[\w-]*)(?:=(?:(?:[\w-]*)*|"(?:[^\r\n])*"))?)*\r\n/i', $encoded, $matches);
            if (!$is_chunked) {
                // Looks like it's not chunked after all
                return $data;
            }
            $length = hexdec(trim($matches[1]));
            if ($length === 0) {
                // Ignore trailer headers
                return $decoded;
            }
            $chunk_length = strlen($matches[0]);
            $decoded .= substr($encoded, $chunk_length, $length);
            $encoded = substr($encoded, $chunk_length + $length + 2);
            if (trim($encoded) === '0' || empty($encoded)) {
                return $decoded;
            }
        }
        // We'll never actually get down here
        // @codeCoverageIgnoreStart
    }
    // @codeCoverageIgnoreEnd
    /**
     * Convert a key => value array to a 'key: value' array for headers
     *
     * @param iterable $dictionary Dictionary of header values
     * @return array List of headers
     *
     * @throws \VendorDuplicator\WpOrg\Requests\Exception\InvalidArgument When the passed argument is not iterable.
     */
    public static function flatten($dictionary)
    {
        if (InputValidator::is_iterable($dictionary) === \false) {
            throw InvalidArgument::create(1, '$dictionary', 'iterable', gettype($dictionary));
        }
        $return = [];
        foreach ($dictionary as $key => $value) {
            $return[] = sprintf('%s: %s', $key, $value);
        }
        return $return;
    }
    /**
     * Decompress an encoded body
     *
     * Implements gzip, compress and deflate. Guesses which it is by attempting
     * to decode.
     *
     * @param string $data Compressed data in one of the above formats
     * @return string Decompressed string
     *
     * @throws \VendorDuplicator\WpOrg\Requests\Exception\InvalidArgument When the passed argument is not a string.
     */
    public static function decompress($data)
    {
        if (is_string($data) === \false) {
            throw InvalidArgument::create(1, '$data', 'string', gettype($data));
        }
        if (trim($data) === '') {
            // Empty body does not need further processing.
            return $data;
        }
        $marker = substr($data, 0, 2);
        if (!isset(self::$magic_compression_headers[$marker])) {
            // Not actually compressed. Probably cURL ruining this for us.
            return $data;
        }
        if (function_exists('gzdecode')) {
            $decoded = @gzdecode($data);
            if ($decoded !== \false) {
                return $decoded;
            }
        }
        if (function_exists('gzinflate')) {
            $decoded = @gzinflate($data);
            if ($decoded !== \false) {
                return $decoded;
            }
        }
        $decoded = self::compatible_gzinflate($data);
        if ($decoded !== \false) {
            return $decoded;
        }
        if (function_exists('gzuncompress')) {
            $decoded = @gzuncompress($data);
            if ($decoded !== \false) {
                return $decoded;
            }
        }
        return $data;
    }
    /**
     * Decompression of deflated string while staying compatible with the majority of servers.
     *
     * Certain Servers will return deflated data with headers which PHP's gzinflate()
     * function cannot handle out of the box. The following function has been created from
     * various snippets on the gzinflate() PHP documentation.
     *
     * Warning: Magic numbers within. Due to the potential different formats that the compressed
     * data may be returned in, some "magic offsets" are needed to ensure proper decompression
     * takes place. For a simple progmatic way to determine the magic offset in use, see:
     * https://core.trac.wordpress.org/ticket/18273
     *
     * @since 1.6.0
     * @link https://core.trac.wordpress.org/ticket/18273
     * @link https://www.php.net/gzinflate#70875
     * @link https://www.php.net/gzinflate#77336
     *
     * @param string $gz_data String to decompress.
     * @return string|bool False on failure.
     *
     * @throws \VendorDuplicator\WpOrg\Requests\Exception\InvalidArgument When the passed argument is not a string.
     */
    public static function compatible_gzinflate($gz_data)
    {
        if (is_string($gz_data) === \false) {
            throw InvalidArgument::create(1, '$gz_data', 'string', gettype($gz_data));
        }
        if (trim($gz_data) === '') {
            return \false;
        }
        // Compressed data might contain a full zlib header, if so strip it for
        // gzinflate()
        if (substr($gz_data, 0, 3) === "\x1f\x8b\x08") {
            $i = 10;
            $flg = ord(substr($gz_data, 3, 1));
            if ($flg > 0) {
                if ($flg & 4) {
                    list($xlen) = unpack('v', substr($gz_data, $i, 2));
                    $i += 2 + $xlen;
                }
                if ($flg & 8) {
                    $i = strpos($gz_data, "\x00", $i) + 1;
                }
                if ($flg & 16) {
                    $i = strpos($gz_data, "\x00", $i) + 1;
                }
                if ($flg & 2) {
                    $i += 2;
                }
            }
            $decompressed = self::compatible_gzinflate(substr($gz_data, $i));
            if ($decompressed !== \false) {
                return $decompressed;
            }
        }
        // If the data is Huffman Encoded, we must first strip the leading 2
        // byte Huffman marker for gzinflate()
        // The response is Huffman coded by many compressors such as
        // java.util.zip.Deflater, Ruby's Zlib::Deflate, and .NET's
        // System.IO.Compression.DeflateStream.
        //
        // See https://decompres.blogspot.com/ for a quick explanation of this
        // data type
        $huffman_encoded = \false;
        // low nibble of first byte should be 0x08
        list(, $first_nibble) = unpack('h', $gz_data);
        // First 2 bytes should be divisible by 0x1F
        list(, $first_two_bytes) = unpack('n', $gz_data);
        if ($first_nibble === 0x8 && $first_two_bytes % 0x1f === 0) {
            $huffman_encoded = \true;
        }
        if ($huffman_encoded) {
            $decompressed = @gzinflate(substr($gz_data, 2));
            if ($decompressed !== \false) {
                return $decompressed;
            }
        }
        if (substr($gz_data, 0, 4) === "PK\x03\x04") {
            // ZIP file format header
            // Offset 6: 2 bytes, General-purpose field
            // Offset 26: 2 bytes, filename length
            // Offset 28: 2 bytes, optional field length
            // Offset 30: Filename field, followed by optional field, followed
            // immediately by data
            list(, $general_purpose_flag) = unpack('v', substr($gz_data, 6, 2));
            // If the file has been compressed on the fly, 0x08 bit is set of
            // the general purpose field. We can use this to differentiate
            // between a compressed document, and a ZIP file
            $zip_compressed_on_the_fly = (0x8 & $general_purpose_flag) === 0x8;
            if (!$zip_compressed_on_the_fly) {
                // Don't attempt to decode a compressed zip file
                return $gz_data;
            }
            // Determine the first byte of data, based on the above ZIP header
            // offsets:
            $first_file_start = array_sum(unpack('v2', substr($gz_data, 26, 4)));
            $decompressed = @gzinflate(substr($gz_data, 30 + $first_file_start));
            if ($decompressed !== \false) {
                return $decompressed;
            }
            return \false;
        }
        // Finally fall back to straight gzinflate
        $decompressed = @gzinflate($gz_data);
        if ($decompressed !== \false) {
            return $decompressed;
        }
        // Fallback for all above failing, not expected, but included for
        // debugging and preventing regressions and to track stats
        $decompressed = @gzinflate(substr($gz_data, 2));
        if ($decompressed !== \false) {
            return $decompressed;
        }
        return \false;
    }
}
