<?php
/**
* Requests for PHP
*
* Inspired by Requests for Python.
*
* Based on concepts from SimplePie_File, RequestCore and WP_Http.
*
* @package Requests
*/
/**
* 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;
/**
* Current version of Requests
*
* @var string
*/
const VERSION = '1.8.1';
/**
* Registered transport classes
*
* @var array
*/
protected static $transports = array();
/**
* Selected transport name
*
* Use {@see get_transport()} instead
*
* @var array
*/
public static $transport = array();
/**
* Default certificate path.
*
* @see Requests::get_certificate_path()
* @see Requests::set_certificate_path()
*
* @var string
*/
protected static $certificate_path;
/**
* This is a static class, do not instantiate it
*
* @codeCoverageIgnore
*/
private function __construct() {}
/**
* Autoloader for Requests
*
* Register this with {@see register_autoloader()} if you'd like to avoid
* having to create your own.
*
* (You can also use `spl_autoload_register` directly if you'd prefer.)
*
* @codeCoverageIgnore
*
* @param string $class Class name to load
*/
public static function autoloader($class) {
// Check that the class starts with "Requests"
if (strpos($class, 'Requests') !== 0) {
return;
}
$file = str_replace('_', '/', $class);
if (file_exists(dirname(__FILE__) . '/' . $file . '.php')) {
require_once dirname(__FILE__) . '/' . $file . '.php';
}
}
/**
* Register the built-in autoloader
*
* @codeCoverageIgnore
*/
public static function register_autoloader() {
spl_autoload_register(array('Requests', 'autoloader'));
}
/**
* Register a transport
*
* @param string $transport Transport class to add, must support the Requests_Transport interface
*/
public static function add_transport($transport) {
if (empty(self::$transports)) {
self::$transports = array(
'Requests_Transport_cURL',
'Requests_Transport_fsockopen',
);
}
self::$transports = array_merge(self::$transports, array($transport));
}
/**
* Get a working transport
*
* @throws Requests_Exception If no valid transport is found (`notransport`)
* @return Requests_Transport
*/
protected static function get_transport($capabilities = array()) {
// 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[$cap_string]) && self::$transport[$cap_string] !== null) {
$class = self::$transport[$cap_string];
return new $class();
}
// @codeCoverageIgnoreEnd
if (empty(self::$transports)) {
self::$transports = array(
'Requests_Transport_cURL',
'Requests_Transport_fsockopen',
);
}
// Find us a working transport
foreach (self::$transports as $class) {
if (!class_exists($class)) {
continue;
}
$result = call_user_func(array($class, 'test'), $capabilities);
if ($result) {
self::$transport[$cap_string] = $class;
break;
}
}
if (self::$transport[$cap_string] === null) {
throw new Requests_Exception('No working transports found', 'notransport', self::$transports);
}
$class = self::$transport[$cap_string];
return new $class();
}
/**#@+
* @see request()
* @param string $url
* @param array $headers
* @param array $options
* @return Requests_Response
*/
/**
* Send a GET request
*/
public static function get($url, $headers = array(), $options = array()) {
return self::request($url, $headers, null, self::GET, $options);
}
/**
* Send a HEAD request
*/
public static function head($url, $headers = array(), $options = array()) {
return self::request($url, $headers, null, self::HEAD, $options);
}
/**
* Send a DELETE request
*/
public static function delete($url, $headers = array(), $options = array()) {
return self::request($url, $headers, null, self::DELETE, $options);
}
/**
* Send a TRACE request
*/
public static function trace($url, $headers = array(), $options = array()) {
return self::request($url, $headers, null, self::TRACE, $options);
}
/**#@-*/
/**#@+
* @see request()
* @param string $url
* @param array $headers
* @param array $data
* @param array $options
* @return Requests_Response
*/
/**
* Send a POST request
*/
public static function post($url, $headers = array(), $data = array(), $options = array()) {
return self::request($url, $headers, $data, self::POST, $options);
}
/**
* Send a PUT request
*/
public static function put($url, $headers = array(), $data = array(), $options = array()) {
return self::request($url, $headers, $data, self::PUT, $options);
}
/**
* Send an OPTIONS request
*/
public static function options($url, $headers = array(), $data = array(), $options = array()) {
return self::request($url, $headers, $data, self::OPTIONS, $options);
}
/**
* Send a PATCH request
*
* Note: Unlike {@see post} and {@see put}, `$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 = array(), $options = array()) {
return self::request($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/$version)
* - `follow_redirects`: Should we follow 3xx redirects?
* (boolean, default: true)
* - `redirects`: How many times should we redirect before erroring?
* (integer, default: 10)
* - `blocking`: Should we block processing on this request?
* (boolean, default: true)
* - `filename`: File to stream the body to instead.
* (string|boolean, default: false)
* - `auth`: Authentication handler or array of user/password details to use
* for Basic authentication
* (Requests_Auth|array|boolean, default: false)
* - `proxy`: Proxy details to use for proxy by-passing and authentication
* (Requests_Proxy|array|string|boolean, default: false)
* - `max_bytes`: Limit for the response body size.
* (integer|boolean, default: false)
* - `idn`: Enable IDN parsing
* (boolean, default: true)
* - `transport`: Custom transport. Either a class name, or a
* transport object. Defaults to the first working transport from
* {@see getTransport()}
* (string|Requests_Transport, default: {@see getTransport()})
* - `hooks`: Hooks handler.
* (Requests_Hooker, default: new Requests_Hooks())
* - `verify`: Should we verify SSL certificates? Allows passing in a custom
* certificate file as a string. (Using true uses the system-wide root
* certificate store instead, but this may have different behaviour
* across transports.)
* (string|boolean, default: library/Requests/Transport/cacert.pem)
* - `verifyname`: Should we verify the common name in the SSL certificate?
* (boolean, default: true)
* - `data_format`: How should we send the `$data` parameter?
* (string, one of 'query' or 'body', default: 'query' for
* HEAD/GET/DELETE, 'body' for POST/PUT/OPTIONS/PATCH)
*
* @throws Requests_Exception On invalid URLs (`nonhttp`)
*
* @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 (use Requests constants)
* @param array $options Options for the request (see description for more information)
* @return Requests_Response
*/
public static function request($url, $headers = array(), $data = array(), $type = self::GET, $options = array()) {
if (empty($options['type'])) {
$options['type'] = $type;
}
$options = array_merge(self::get_default_options(), $options);
self::set_defaults($url, $headers, $data, $type, $options);
$options['hooks']->dispatch('requests.before_request', array(&$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 = array('ssl' => $need_ssl);
$transport = self::get_transport($capabilities);
}
$response = $transport->request($url, $headers, $data, $options);
$options['hooks']->dispatch('requests.before_parse', array(&$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 `$url` parameter to
* {@see Requests::request}
* (string, required)
* - `headers`: Associative array of header fields. Same as the `$headers`
* parameter to {@see Requests::request}
* (array, default: `array()`)
* - `data`: Associative array of data fields or a string. Same as the
* `$data` parameter to {@see Requests::request}
* (array|string, default: `array()`)
* - `type`: HTTP request type (use Requests constants). Same as the `$type`
* parameter to {@see Requests::request}
* (string, default: `Requests::GET`)
* - `cookies`: Associative array of cookie name to value, or cookie jar.
* (array|Requests_Cookie_Jar)
*
* If the `$options` parameter is specified, individual requests will
* inherit options from it. This can be used to use a single hooking system,
* or set all the types to `Requests::POST`, for example.
*
* In addition, the `$options` parameter takes the following global options:
*
* - `complete`: A callback for when a request is complete. Takes two
* parameters, a Requests_Response/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 $options Global and default options (see {@see Requests::request})
* @return array Responses (either Requests_Response or a Requests_Exception object)
*/
public static function request_multiple($requests, $options = array()) {
$options = array_merge(self::get_default_options(true), $options);
if (!empty($options['hooks'])) {
$options['hooks']->register('transport.internal.parse_response', array('Requests', 'parse_multiple'));
if (!empty($options['complete'])) {
$options['hooks']->register('multiple.request.complete', $options['complete']);
}
}
foreach ($requests as $id => &$request) {
if (!isset($request['headers'])) {
$request['headers'] = array();
}
if (!isset($request['data'])) {
$request['data'] = array();
}
if (!isset($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']) {
$request['options']['hooks']->register('transport.internal.parse_response', array('Requests', 'parse_multiple'));
if (!empty($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);
$request['options']['hooks']->dispatch('multiple.request.complete', array(&$response, $id));
}
}
return $responses;
}
/**
* Get the default options
*
* @see 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) {
$defaults = array(
'timeout' => 10,
'connect_timeout' => 10,
'useragent' => 'php-requests/' . self::VERSION,
'protocol_version' => 1.1,
'redirected' => 0,
'redirects' => 10,
'follow_redirects' => true,
'blocking' => true,
'type' => self::GET,
'filename' => false,
'auth' => false,
'proxy' => false,
'cookies' => false,
'max_bytes' => false,
'idn' => true,
'hooks' => null,
'transport' => null,
'verify' => self::get_certificate_path(),
'verifyname' => true,
);
if ($multirequest !== false) {
$defaults['complete'] = null;
}
return $defaults;
}
/**
* Get default certificate path.
*
* @return string Default certificate path.
*/
public static function get_certificate_path() {
if (!empty(self::$certificate_path)) {
return self::$certificate_path;
}
return dirname(__FILE__) . '/Requests/Transport/cacert.pem';
}
/**
* Set default certificate path.
*
* @param string $path Certificate path, pointing to a PEM file.
*/
public static function set_certificate_path($path) {
self::$certificate_path = $path;
}
/**
* Set the default values
*
* @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 array $options
*/
protected static function set_defaults(&$url, &$headers, &$data, &$type, &$options) {
if (!preg_match('/^http(s)?:\/\//i', $url, $matches)) {
throw new Requests_Exception('Only HTTP(S) requests are handled.', 'nonhttp', $url);
}
if (empty($options['hooks'])) {
$options['hooks'] = new Requests_Hooks();
}
if (is_array($options['auth'])) {
$options['auth'] = new Requests_Auth_Basic($options['auth']);
}
if ($options['auth'] !== false) {
$options['auth']->register($options['hooks']);
}
if (is_string($options['proxy']) || is_array($options['proxy'])) {
$options['proxy'] = new Requests_Proxy_HTTP($options['proxy']);
}
if ($options['proxy'] !== false) {
$options['proxy']->register($options['hooks']);
}
if (is_array($options['cookies'])) {
$options['cookies'] = new Requests_Cookie_Jar($options['cookies']);
}
elseif (empty($options['cookies'])) {
$options['cookies'] = new Requests_Cookie_Jar();
}
if ($options['cookies'] !== false) {
$options['cookies']->register($options['hooks']);
}
if ($options['idn'] !== false) {
$iri = new Requests_IRI($url);
$iri->host = Requests_IDNAEncoder::encode($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, array(self::HEAD, self::GET, self::DELETE), true)) {
$options['data_format'] = 'query';
}
else {
$options['data_format'] = 'body';
}
}
}
/**
* HTTP response parser
*
* @throws Requests_Exception On missing head/body separator (`requests.no_crlf_separator`)
* @throws Requests_Exception On missing head/body separator (`noversion`)
* @throws Requests_Exception On missing head/body separator (`toomanyredirects`)
*
* @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 $options array passed to {@link request()}, in case we need to follow redirects
* @return Requests_Response
*/
protected static function parse_response($headers, $url, $req_headers, $req_data, $options) {
$return = new Requests_Response();
if (!$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 Requests_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 Requests_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']);
}
$options['hooks']->dispatch('requests.before_redirect_check', array(&$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
$location = Requests_IRI::absolutize($url, $location);
$location = $location->uri;
}
$hook_args = array(
&$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 Requests_Exception('Too many redirects', 'toomanyredirects', $return);
}
}
$return->redirects = $options['redirected'];
$options['hooks']->dispatch('requests.after_request', array(&$return, $req_headers, $req_data, $options));
return $return;
}
/**
* Callback for `transport.internal.parse_response`
*
* Internal use only. Converts a raw HTTP response to a Requests_Response
* while still executing a multiple request.
*
* @param string $response Full response text including headers and body (will be overwritten with Response instance)
* @param array $request Request data as passed into {@see Requests::request_multiple()}
* @return null `$response` is either set to a Requests_Response instance, or a Requests_Exception object
*/
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 (Requests_Exception $e) {
$response = $e;
}
}
/**
* Decoded a chunked body as per RFC 2616
*
* @see 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 array $array Dictionary of header values
* @return array List of headers
*/
public static function flatten($array) {
$return = array();
foreach ($array as $key => $value) {
$return[] = sprintf('%s: %s', $key, $value);
}
return $return;
}
/**
* Convert a key => value array to a 'key: value' array for headers
*
* @codeCoverageIgnore
* @deprecated Misspelling of {@see Requests::flatten}
* @param array $array Dictionary of header values
* @return array List of headers
*/
public static function flattern($array) {
return self::flatten($array);
}
/**
* Decompress an encoded body
*
* Implements gzip, compress and deflate. Guesses which it is by attempting
* to decode.
*
* @param string $data Compressed data in one of the above formats
* @return string Decompressed string
*/
public static function decompress($data) {
if (substr($data, 0, 2) !== "\x1f\x8b" && substr($data, 0, 2) !== "\x78\x9c") {
// Not actually compressed. Probably cURL ruining this for us.
return $data;
}
if (function_exists('gzdecode')) {
// phpcs:ignore PHPCompatibility.FunctionUse.NewFunctions.gzdecodeFound -- Wrapped in function_exists() for PHP 5.2.
$decoded = @gzdecode($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 2.8.1
* @link https://core.trac.wordpress.org/ticket/18273
* @link https://secure.php.net/manual/en/function.gzinflate.php#70875
* @link https://secure.php.net/manual/en/function.gzinflate.php#77336
*
* @param string $gz_data String to decompress.
* @return string|bool False on failure.
*/
public static function compatible_gzinflate($gz_data) {
// 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 $decompressed;
}
return false;
}
public static function match_domain($host, $reference) {
// Check for a direct match
if ($host === $reference) {
return true;
}
// Calculate the valid wildcard match if the host is not an IP address
// Also validates that the host has 3 parts or more, as per Firefox's
// ruleset.
$parts = explode('.', $host);
if (ip2long($host) === false && count($parts) >= 3) {
$parts[0] = '*';
$wildcard = implode('.', $parts);
if ($wildcard === $reference) {
return true;
}
}
return false;
}
}
Mini Shell