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Editing: Requests.php
<?php /** * Requests for PHP * * Inspired by Requests for Python. * * Based on concepts from SimplePie_File, RequestCore and WP_Http. * * @package Requests */ namespace WpOrg\Requests; use WpOrg\Requests\Auth\Basic; use WpOrg\Requests\Capability; use WpOrg\Requests\Cookie\Jar; use WpOrg\Requests\Exception; use WpOrg\Requests\Exception\InvalidArgument; use WpOrg\Requests\Hooks; use WpOrg\Requests\IdnaEncoder; use WpOrg\Requests\Iri; use WpOrg\Requests\Proxy\Http; use WpOrg\Requests\Response; use WpOrg\Requests\Transport\Curl; use WpOrg\Requests\Transport\Fsockopen; use 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 \WpOrg\Requests\Requests::get_default_options() * @see \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 = '2.0.17'; /** * 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 \WpOrg\Requests\Requests::get_certificate_path() * @see \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. "\x78\x01" => true, // Zlib marker - level 1. "\x78\x5e" => true, // Zlib marker - level 2 to 5. "\x78\x9c" => true, // Zlib marker - level 6. "\x78\xda" => true, // Zlib marker - level 7 to 9. ]; /** * 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 \WpOrg\Requests\Transport * @throws \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 \WpOrg\Requests\Requests::request() * @param string $url * @param array $headers * @param array $options * @return \WpOrg\Requests\Response */ /** * Send a GET request */ public static function get($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 \WpOrg\Requests\Requests::request() * @param string $url * @param array $headers * @param array $data * @param array $options * @return \WpOrg\Requests\Response */ /** * Send a POST request */ public static function post($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 \WpOrg\Requests\Response * * @throws \WpOrg\Requests\Exception\InvalidArgument When the passed $url argument is not a string or Stringable. * @throws \WpOrg\Requests\Exception\InvalidArgument When the passed $type argument is not a string. * @throws \WpOrg\Requests\Exception\InvalidArgument When the passed $options argument is not an array. * @throws \WpOrg\Requests\Exception On invalid URLs (`nonhttp`) */ public static function request($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 \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 $options argument is not an array. */ public static function request_multiple($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 \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 \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 \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 $options array passed to {@link request()}, in case we need to follow redirects * @return \WpOrg\Requests\Response * * @throws \WpOrg\Requests\Exception On missing head/body separator (`requests.no_crlf_separator`) * @throws \WpOrg\Requests\Exception On missing head/body separator (`noversion`) * @throws \WpOrg\Requests\Exception On missing head/body separator (`toomanyredirects`) */ protected static function parse_response($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 $dictionary Dictionary of header values * @return array List of headers * * @throws \WpOrg\Requests\Exception\InvalidArgument When the passed argument is not iterable. */ public static function flatten($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 $data Compressed data in one of the above formats * @return string Decompressed string * * @throws \WpOrg\Requests\Exception\InvalidArgument When the passed argument is not a string. */ public static function decompress($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 $gz_data String to decompress. * @return string|bool False on failure. * * @throws \WpOrg\Requests\Exception\InvalidArgument When the passed argument is not a string. */ public static function compatible_gzinflate($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, "\0", $i) + 1; } if ($flg & 16) { $i = strpos($gz_data, "\0", $i) + 1; } if ($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 === 0x08 && ($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) === "\x50\x4b\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 = ((0x08 & $general_purpose_flag) === 0x08); if (!$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; } }
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