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720 lines
26 KiB
PHP
720 lines
26 KiB
PHP
<?php
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/**
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* Humble HTTP Agent
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*
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* This class is designed to take advantage of parallel HTTP requests
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* offered by PHP's PECL HTTP extension or the curl_multi_* functions.
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* For environments which do not have these options, it reverts to standard sequential
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* requests (using file_get_contents())
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*
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* @version 1.0
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* @date 2012-02-09
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* @see http://php.net/HttpRequestPool
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* @author Keyvan Minoukadeh
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* @copyright 2011-2012 Keyvan Minoukadeh
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* @license http://www.gnu.org/licenses/agpl-3.0.html AGPL v3
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*/
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class HumbleHttpAgent
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{
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const METHOD_REQUEST_POOL = 1;
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const METHOD_CURL_MULTI = 2;
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const METHOD_FILE_GET_CONTENTS = 4;
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//const UA_BROWSER = 'Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0.1) Gecko/20100101 Firefox/4.0.1';
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const UA_BROWSER = 'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.2 (KHTML, like Gecko) Chrome/15.0.874.92 Safari/535.2';
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const UA_PHP = 'PHP/5.2';
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const REF_GOOGLE = 'http://www.google.co.uk/url?sa=t&source=web&cd=1';
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protected $requests = array();
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protected $redirectQueue = array();
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protected $requestOptions;
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protected $maxParallelRequests = 5;
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protected $cache = null; //TODO
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protected $httpContext;
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protected $minimiseMemoryUse = false; //TODO
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protected $debug = false;
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protected $method;
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protected $cookieJar;
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public $rewriteHashbangFragment = true; // see http://code.google.com/web/ajaxcrawling/docs/specification.html
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public $maxRedirects = 5;
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public $userAgentMap = array();
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public $rewriteUrls = array();
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public $userAgentDefault;
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public $referer;
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//public $userAgent = 'Mozilla/5.0';
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// Prevent certain file/mime types
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// HTTP responses which match these content types will
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// be returned without body.
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public $headerOnlyTypes = array();
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// URLs ending with one of these extensions will
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// prompt Humble HTTP Agent to send a HEAD request first
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// to see if returned content type matches $headerOnlyTypes.
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public $headerOnlyClues = array('pdf','mp3','zip','exe','gif','gzip','gz','jpeg','jpg','mpg','mpeg','png','ppt','mov');
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//TODO: set max file size
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//TODO: normalise headers
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function __construct($requestOptions=null, $method=null) {
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$this->userAgentDefault = self::UA_BROWSER;
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$this->referer = self::REF_GOOGLE;
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// set the request method
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if (in_array($method, array(1,2,4))) {
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$this->method = $method;
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} else {
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if (class_exists('HttpRequestPool')) {
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$this->method = self::METHOD_REQUEST_POOL;
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} elseif (function_exists('curl_multi_init')) {
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$this->method = self::METHOD_CURL_MULTI;
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} else {
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$this->method = self::METHOD_FILE_GET_CONTENTS;
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}
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}
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if ($this->method == self::METHOD_CURL_MULTI) {
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require_once(dirname(__FILE__).'/RollingCurl.php');
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}
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// create cookie jar
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$this->cookieJar = new CookieJar();
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// set request options (redirect must be 0)
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$this->requestOptions = array(
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'timeout' => 15,
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'redirect' => 0 // we handle redirects manually so we can rewrite the new hashbang URLs that are creeping up over the web
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// TODO: test onprogress?
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);
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if (is_array($requestOptions)) {
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$this->requestOptions = array_merge($this->requestOptions, $requestOptions);
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}
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$this->httpContext = array(
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'http' => array(
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'ignore_errors' => true,
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'timeout' => $this->requestOptions['timeout'],
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'max_redirects' => $this->requestOptions['redirect'],
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'header' => "Accept: */*\r\n"
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)
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);
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}
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protected function debug($msg) {
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if ($this->debug) {
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$mem = round(memory_get_usage()/1024, 2);
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$memPeak = round(memory_get_peak_usage()/1024, 2);
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echo '* ',$msg;
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echo ' - mem used: ',$mem," (peak: $memPeak)\n";
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ob_flush();
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flush();
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}
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}
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protected function getUserAgent($url, $asArray=false) {
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$host = @parse_url($url, PHP_URL_HOST);
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if (strtolower(substr($host, 0, 4)) == 'www.') {
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$host = substr($host, 4);
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}
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if ($host) {
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$try = array($host);
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$split = explode('.', $host);
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if (count($split) > 1) {
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array_shift($split);
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$try[] = '.'.implode('.', $split);
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}
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foreach ($try as $h) {
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if (isset($this->userAgentMap[$h])) {
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$ua = $this->userAgentMap[$h];
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break;
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}
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}
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}
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if (!isset($ua)) $ua = $this->userAgentDefault;
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if ($asArray) {
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return array('User-Agent' => $ua);
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} else {
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return 'User-Agent: '.$ua;
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}
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}
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public function rewriteHashbangFragment($url) {
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// return $url if there's no '#!'
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if (strpos($url, '#!') === false) return $url;
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// split $url and rewrite
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// TODO: is SimplePie_IRI included?
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$iri = new SimplePie_IRI($url);
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$fragment = substr($iri->fragment, 1); // strip '!'
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$iri->fragment = null;
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if (isset($iri->query)) {
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parse_str($iri->query, $query);
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} else {
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$query = array();
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}
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$query['_escaped_fragment_'] = (string)$fragment;
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$iri->query = str_replace('%2F', '/', http_build_query($query)); // needed for some sites
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return $iri->get_iri();
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}
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public function removeFragment($url) {
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$pos = strpos($url, '#');
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if ($pos === false) {
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return $url;
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} else {
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return substr($url, 0, $pos);
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}
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}
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public function rewriteUrls($url) {
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foreach ($this->rewriteUrls as $find => $action) {
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if (strpos($url, $find) !== false) {
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if (is_array($action)) {
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return strtr($url, $action);
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}
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}
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}
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return $url;
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}
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public function enableDebug($bool=true) {
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$this->debug = (bool)$bool;
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}
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public function minimiseMemoryUse($bool = true) {
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$this->minimiseMemoryUse = $bool;
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}
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public function setMaxParallelRequests($max) {
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$this->maxParallelRequests = $max;
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}
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public function validateUrl($url) {
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$url = filter_var($url, FILTER_SANITIZE_URL);
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$test = filter_var($url, FILTER_VALIDATE_URL, FILTER_FLAG_SCHEME_REQUIRED);
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// deal with bug http://bugs.php.net/51192 (present in PHP 5.2.13 and PHP 5.3.2)
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if ($test === false) {
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$test = filter_var(strtr($url, '-', '_'), FILTER_VALIDATE_URL, FILTER_FLAG_SCHEME_REQUIRED);
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}
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if ($test !== false && $test !== null && preg_match('!^https?://!', $url)) {
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return $url;
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} else {
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return false;
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}
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}
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public function fetchAll(array $urls) {
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$this->fetchAllOnce($urls, $isRedirect=false);
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$redirects = 0;
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while (!empty($this->redirectQueue) && ++$redirects <= $this->maxRedirects) {
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$this->debug("Following redirects #$redirects...");
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$this->fetchAllOnce($this->redirectQueue, $isRedirect=true);
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}
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}
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// fetch all URLs without following redirects
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public function fetchAllOnce(array $urls, $isRedirect=false) {
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if (!$isRedirect) $urls = array_unique($urls);
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if (empty($urls)) return;
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//////////////////////////////////////////////////////
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// parallel (HttpRequestPool)
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if ($this->method == self::METHOD_REQUEST_POOL) {
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$this->debug('Starting parallel fetch (HttpRequestPool)');
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try {
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while (count($urls) > 0) {
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$this->debug('Processing set of '.min($this->maxParallelRequests, count($urls)));
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$subset = array_splice($urls, 0, $this->maxParallelRequests);
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$pool = new HttpRequestPool();
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foreach ($subset as $orig => $url) {
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if (!$isRedirect) $orig = $url;
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unset($this->redirectQueue[$orig]);
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$this->debug("...$url");
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if (!$isRedirect && isset($this->requests[$url])) {
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$this->debug("......in memory");
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/*
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} elseif ($this->isCached($url)) {
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$this->debug("......is cached");
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if (!$this->minimiseMemoryUse) {
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$this->requests[$url] = $this->getCached($url);
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}
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*/
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} else {
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$this->debug("......adding to pool");
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$req_url = $this->rewriteUrls($url);
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$req_url = ($this->rewriteHashbangFragment) ? $this->rewriteHashbangFragment($req_url) : $req_url;
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$req_url = $this->removeFragment($req_url);
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if (!empty($this->headerOnlyTypes) && !isset($this->requests[$orig]['wrongGuess']) && $this->possibleUnsupportedType($req_url)) {
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$_meth = HttpRequest::METH_HEAD;
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} else {
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$_meth = HttpRequest::METH_GET;
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unset($this->requests[$orig]['wrongGuess']);
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}
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$httpRequest = new HttpRequest($req_url, $_meth, $this->requestOptions);
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// send cookies, if we have any
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if ($cookies = $this->cookieJar->getMatchingCookies($req_url)) {
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$this->debug("......sending cookies: $cookies");
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$httpRequest->addHeaders(array('Cookie' => $cookies));
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}
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//$httpRequest->addHeaders(array('User-Agent' => $this->userAgent));
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$httpRequest->addHeaders($this->getUserAgent($req_url, true));
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// add referer for picky sites
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$httpRequest->addheaders(array('Referer' => $this->referer));
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$this->requests[$orig] = array('headers'=>null, 'body'=>null, 'httpRequest'=>$httpRequest);
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$this->requests[$orig]['original_url'] = $orig;
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$pool->attach($httpRequest);
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}
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}
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// did we get anything into the pool?
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if (count($pool) > 0) {
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$this->debug('Sending request...');
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try {
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$pool->send();
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} catch (HttpRequestPoolException $e) {
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// do nothing
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}
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$this->debug('Received responses');
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foreach($subset as $orig => $url) {
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if (!$isRedirect) $orig = $url;
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$request = $this->requests[$orig]['httpRequest'];
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//$this->requests[$orig]['headers'] = $this->headersToString($request->getResponseHeader());
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// getResponseHeader() doesn't return status line, so, for consistency...
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$this->requests[$orig]['headers'] = substr($request->getRawResponseMessage(), 0, $request->getResponseInfo('header_size'));
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// check content type
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// TODO: use getResponseHeader('content-type') or getResponseInfo()
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if ($this->headerOnlyType($this->requests[$orig]['headers'])) {
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$this->requests[$orig]['body'] = '';
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$_header_only_type = true;
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$this->debug('Header only type returned');
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} else {
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$this->requests[$orig]['body'] = $request->getResponseBody();
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$_header_only_type = false;
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}
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$this->requests[$orig]['effective_url'] = $request->getResponseInfo('effective_url');
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$this->requests[$orig]['status_code'] = $status_code = $request->getResponseCode();
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// is redirect?
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if ((in_array($status_code, array(300, 301, 302, 303, 307)) || $status_code > 307 && $status_code < 400) && $request->getResponseHeader('location')) {
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$redirectURL = $request->getResponseHeader('location');
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if (!preg_match('!^https?://!i', $redirectURL)) {
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$redirectURL = SimplePie_Misc::absolutize_url($redirectURL, $url);
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}
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if ($this->validateURL($redirectURL)) {
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$this->debug('Redirect detected. Valid URL: '.$redirectURL);
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// store any cookies
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$cookies = $request->getResponseHeader('set-cookie');
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if ($cookies && !is_array($cookies)) $cookies = array($cookies);
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if ($cookies) $this->cookieJar->storeCookies($url, $cookies);
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$this->redirectQueue[$orig] = $redirectURL;
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} else {
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$this->debug('Redirect detected. Invalid URL: '.$redirectURL);
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}
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} elseif (!$_header_only_type && $request->getMethod() === HttpRequest::METH_HEAD) {
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// the response content-type did not match our 'header only' types,
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// but we'd issues a HEAD request because we assumed it would. So
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// let's queue a proper GET request for this item...
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$this->debug('Wrong guess at content-type, queing GET request');
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$this->requests[$orig]['wrongGuess'] = true;
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$this->redirectQueue[$orig] = $this->requests[$orig]['effective_url'];
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}
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//die($url.' -multi- '.$request->getResponseInfo('effective_url'));
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$pool->detach($request);
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unset($this->requests[$orig]['httpRequest'], $request);
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/*
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if ($this->minimiseMemoryUse) {
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if ($this->cache($url)) {
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unset($this->requests[$url]);
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}
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}
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*/
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}
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}
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}
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} catch (HttpException $e) {
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$this->debug($e);
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return false;
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}
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}
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//////////////////////////////////////////////////////////
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// parallel (curl_multi_*)
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elseif ($this->method == self::METHOD_CURL_MULTI) {
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$this->debug('Starting parallel fetch (curl_multi_*)');
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while (count($urls) > 0) {
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$this->debug('Processing set of '.min($this->maxParallelRequests, count($urls)));
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$subset = array_splice($urls, 0, $this->maxParallelRequests);
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$pool = new RollingCurl(array($this, 'handleCurlResponse'));
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$pool->window_size = count($subset);
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foreach ($subset as $orig => $url) {
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if (!$isRedirect) $orig = $url;
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unset($this->redirectQueue[$orig]);
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$this->debug("...$url");
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if (!$isRedirect && isset($this->requests[$url])) {
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$this->debug("......in memory");
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/*
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} elseif ($this->isCached($url)) {
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$this->debug("......is cached");
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if (!$this->minimiseMemoryUse) {
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$this->requests[$url] = $this->getCached($url);
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}
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*/
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} else {
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$this->debug("......adding to pool");
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$req_url = $this->rewriteUrls($url);
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$req_url = ($this->rewriteHashbangFragment) ? $this->rewriteHashbangFragment($req_url) : $req_url;
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$req_url = $this->removeFragment($req_url);
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if (!empty($this->headerOnlyTypes) && !isset($this->requests[$orig]['wrongGuess']) && $this->possibleUnsupportedType($req_url)) {
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$_meth = 'HEAD';
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} else {
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$_meth = 'GET';
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unset($this->requests[$orig]['wrongGuess']);
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}
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$headers = array();
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//$headers[] = 'User-Agent: '.$this->userAgent;
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$headers[] = $this->getUserAgent($req_url);
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// add referer for picky sites
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$headers[] = 'Referer: '.$this->referer;
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// send cookies, if we have any
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if ($cookies = $this->cookieJar->getMatchingCookies($req_url)) {
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$this->debug("......sending cookies: $cookies");
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$headers[] = 'Cookie: '.$cookies;
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}
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$httpRequest = new RollingCurlRequest($req_url, $_meth, null, $headers, array(
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CURLOPT_CONNECTTIMEOUT => $this->requestOptions['timeout'],
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CURLOPT_TIMEOUT => $this->requestOptions['timeout']
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));
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$httpRequest->set_original_url($orig);
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$this->requests[$orig] = array('headers'=>null, 'body'=>null, 'httpRequest'=>$httpRequest);
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$this->requests[$orig]['original_url'] = $orig; // TODO: is this needed anymore?
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$pool->add($httpRequest);
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}
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}
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// did we get anything into the pool?
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if (count($pool) > 0) {
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$this->debug('Sending request...');
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$pool->execute(); // this will call handleCurlResponse() and populate $this->requests[$orig]
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$this->debug('Received responses');
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foreach($subset as $orig => $url) {
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if (!$isRedirect) $orig = $url;
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// $this->requests[$orig]['headers']
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// $this->requests[$orig]['body']
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// $this->requests[$orig]['effective_url']
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// check content type
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if ($this->headerOnlyType($this->requests[$orig]['headers'])) {
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$this->requests[$orig]['body'] = '';
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$_header_only_type = true;
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$this->debug('Header only type returned');
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} else {
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$_header_only_type = false;
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}
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$status_code = $this->requests[$orig]['status_code'];
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if ((in_array($status_code, array(300, 301, 302, 303, 307)) || $status_code > 307 && $status_code < 400) && isset($this->requests[$orig]['location'])) {
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$redirectURL = $this->requests[$orig]['location'];
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if (!preg_match('!^https?://!i', $redirectURL)) {
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$redirectURL = SimplePie_Misc::absolutize_url($redirectURL, $url);
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}
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if ($this->validateURL($redirectURL)) {
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$this->debug('Redirect detected. Valid URL: '.$redirectURL);
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// store any cookies
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$cookies = $this->cookieJar->extractCookies($this->requests[$orig]['headers']);
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if (!empty($cookies)) $this->cookieJar->storeCookies($url, $cookies);
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$this->redirectQueue[$orig] = $redirectURL;
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} else {
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$this->debug('Redirect detected. Invalid URL: '.$redirectURL);
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}
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} elseif (!$_header_only_type && $this->requests[$orig]['method'] == 'HEAD') {
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// the response content-type did not match our 'header only' types,
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// but we'd issues a HEAD request because we assumed it would. So
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// let's queue a proper GET request for this item...
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$this->debug('Wrong guess at content-type, queing GET request');
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$this->requests[$orig]['wrongGuess'] = true;
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$this->redirectQueue[$orig] = $this->requests[$orig]['effective_url'];
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}
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// die($url.' -multi- '.$request->getResponseInfo('effective_url'));
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unset($this->requests[$orig]['httpRequest'], $this->requests[$orig]['method']);
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}
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}
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}
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}
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//////////////////////////////////////////////////////
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// sequential (file_get_contents)
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else {
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$this->debug('Starting sequential fetch (file_get_contents)');
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$this->debug('Processing set of '.count($urls));
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foreach ($urls as $orig => $url) {
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if (!$isRedirect) $orig = $url;
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unset($this->redirectQueue[$orig]);
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$this->debug("...$url");
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if (!$isRedirect && isset($this->requests[$url])) {
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$this->debug("......in memory");
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/*
|
|
} elseif ($this->isCached($url)) {
|
|
$this->debug("......is cached");
|
|
if (!$this->minimiseMemoryUse) {
|
|
$this->requests[$url] = $this->getCached($url);
|
|
}
|
|
*/
|
|
} else {
|
|
$this->debug("Sending request for $url");
|
|
$this->requests[$orig]['original_url'] = $orig;
|
|
$req_url = $this->rewriteUrls($url);
|
|
$req_url = ($this->rewriteHashbangFragment) ? $this->rewriteHashbangFragment($req_url) : $req_url;
|
|
$req_url = $this->removeFragment($req_url);
|
|
// send cookies, if we have any
|
|
$httpContext = $this->httpContext;
|
|
$httpContext['http']['header'] .= $this->getUserAgent($req_url)."\r\n";
|
|
// add referer for picky sites
|
|
$httpContext['http']['header'] .= 'Referer: '.$this->referer."\r\n";
|
|
if ($cookies = $this->cookieJar->getMatchingCookies($req_url)) {
|
|
$this->debug("......sending cookies: $cookies");
|
|
$httpContext['http']['header'] .= 'Cookie: '.$cookies."\r\n";
|
|
}
|
|
if (false !== ($html = @file_get_contents($req_url, false, stream_context_create($httpContext)))) {
|
|
$this->debug('Received response');
|
|
// get status code
|
|
if (!isset($http_response_header[0]) || !preg_match('!^HTTP/\d+\.\d+\s+(\d+)!', trim($http_response_header[0]), $match)) {
|
|
$this->debug('Error: no status code found');
|
|
// TODO: handle error - no status code
|
|
} else {
|
|
$this->requests[$orig]['headers'] = $this->headersToString($http_response_header, false);
|
|
// check content type
|
|
if ($this->headerOnlyType($this->requests[$orig]['headers'])) {
|
|
$this->requests[$orig]['body'] = '';
|
|
} else {
|
|
$this->requests[$orig]['body'] = $html;
|
|
}
|
|
$this->requests[$orig]['effective_url'] = $req_url;
|
|
$this->requests[$orig]['status_code'] = $status_code = (int)$match[1];
|
|
unset($match);
|
|
// handle redirect
|
|
if (preg_match('/^Location:(.*?)$/m', $this->requests[$orig]['headers'], $match)) {
|
|
$this->requests[$orig]['location'] = trim($match[1]);
|
|
}
|
|
if ((in_array($status_code, array(300, 301, 302, 303, 307)) || $status_code > 307 && $status_code < 400) && isset($this->requests[$orig]['location'])) {
|
|
$redirectURL = $this->requests[$orig]['location'];
|
|
if (!preg_match('!^https?://!i', $redirectURL)) {
|
|
$redirectURL = SimplePie_Misc::absolutize_url($redirectURL, $url);
|
|
}
|
|
if ($this->validateURL($redirectURL)) {
|
|
$this->debug('Redirect detected. Valid URL: '.$redirectURL);
|
|
// store any cookies
|
|
$cookies = $this->cookieJar->extractCookies($this->requests[$orig]['headers']);
|
|
if (!empty($cookies)) $this->cookieJar->storeCookies($url, $cookies);
|
|
$this->redirectQueue[$orig] = $redirectURL;
|
|
} else {
|
|
$this->debug('Redirect detected. Invalid URL: '.$redirectURL);
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
$this->debug('Error retrieving URL');
|
|
//print_r($req_url);
|
|
//print_r($http_response_header);
|
|
//print_r($html);
|
|
|
|
// TODO: handle error - failed to retrieve URL
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
public function handleCurlResponse($response, $info, $request) {
|
|
$orig = $request->url_original;
|
|
$this->requests[$orig]['headers'] = substr($response, 0, $info['header_size']);
|
|
$this->requests[$orig]['body'] = substr($response, $info['header_size']);
|
|
$this->requests[$orig]['method'] = $request->method;
|
|
$this->requests[$orig]['effective_url'] = $info['url'];
|
|
$this->requests[$orig]['status_code'] = (int)$info['http_code'];
|
|
if (preg_match('/^Location:(.*?)$/m', $this->requests[$orig]['headers'], $match)) {
|
|
$this->requests[$orig]['location'] = trim($match[1]);
|
|
}
|
|
}
|
|
|
|
protected function headersToString(array $headers, $associative=true) {
|
|
if (!$associative) {
|
|
return implode("\n", $headers);
|
|
} else {
|
|
$str = '';
|
|
foreach ($headers as $key => $val) {
|
|
if (is_array($val)) {
|
|
foreach ($val as $v) $str .= "$key: $v\n";
|
|
} else {
|
|
$str .= "$key: $val\n";
|
|
}
|
|
}
|
|
return rtrim($str);
|
|
}
|
|
}
|
|
|
|
public function get($url, $remove=false, $gzdecode=true) {
|
|
$url = "$url";
|
|
if (isset($this->requests[$url]) && isset($this->requests[$url]['body'])) {
|
|
$this->debug("URL already fetched - in memory ($url, effective: {$this->requests[$url]['effective_url']})");
|
|
$response = $this->requests[$url];
|
|
/*
|
|
} elseif ($this->isCached($url)) {
|
|
$this->debug("URL already fetched - in disk cache ($url)");
|
|
$response = $this->getCached($url);
|
|
$this->requests[$url] = $response;
|
|
*/
|
|
} else {
|
|
$this->debug("Fetching URL ($url)");
|
|
$this->fetchAll(array($url));
|
|
if (isset($this->requests[$url]) && isset($this->requests[$url]['body'])) {
|
|
$response = $this->requests[$url];
|
|
} else {
|
|
$this->debug("Request failed");
|
|
$response = false;
|
|
}
|
|
}
|
|
/*
|
|
if ($this->minimiseMemoryUse && $response) {
|
|
$this->cache($url);
|
|
unset($this->requests[$url]);
|
|
}
|
|
*/
|
|
if ($remove && $response) unset($this->requests[$url]);
|
|
if ($gzdecode && stripos($response['headers'], 'Content-Encoding: gzip')) {
|
|
if ($html = gzdecode($response['body'])) {
|
|
$response['body'] = $html;
|
|
}
|
|
}
|
|
return $response;
|
|
}
|
|
|
|
public function parallelSupport() {
|
|
return class_exists('HttpRequestPool') || function_exists('curl_multi_init');
|
|
}
|
|
|
|
private function headerOnlyType($headers) {
|
|
if (preg_match('!^Content-Type:\s*(([a-z-]+)/([^;\r\n ]+))!im', $headers, $match)) {
|
|
// look for full mime type (e.g. image/jpeg) or just type (e.g. image)
|
|
$match[1] = strtolower(trim($match[1]));
|
|
$match[2] = strtolower(trim($match[2]));
|
|
foreach (array($match[1], $match[2]) as $mime) {
|
|
if (in_array($mime, $this->headerOnlyTypes)) return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
private function possibleUnsupportedType($url) {
|
|
$path = @parse_url($url, PHP_URL_PATH);
|
|
if ($path && strpos($path, '.') !== false) {
|
|
$ext = strtolower(trim(pathinfo($path, PATHINFO_EXTENSION)));
|
|
return in_array($ext, $this->headerOnlyClues);
|
|
}
|
|
return false;
|
|
}
|
|
}
|
|
|
|
// gzdecode from http://www.php.net/manual/en/function.gzdecode.php#82930
|
|
if (!function_exists('gzdecode')) {
|
|
function gzdecode($data,&$filename='',&$error='',$maxlength=null)
|
|
{
|
|
$len = strlen($data);
|
|
if ($len < 18 || strcmp(substr($data,0,2),"\x1f\x8b")) {
|
|
$error = "Not in GZIP format.";
|
|
return null; // Not GZIP format (See RFC 1952)
|
|
}
|
|
$method = ord(substr($data,2,1)); // Compression method
|
|
$flags = ord(substr($data,3,1)); // Flags
|
|
if ($flags & 31 != $flags) {
|
|
$error = "Reserved bits not allowed.";
|
|
return null;
|
|
}
|
|
// NOTE: $mtime may be negative (PHP integer limitations)
|
|
$mtime = unpack("V", substr($data,4,4));
|
|
$mtime = $mtime[1];
|
|
$xfl = substr($data,8,1);
|
|
$os = substr($data,8,1);
|
|
$headerlen = 10;
|
|
$extralen = 0;
|
|
$extra = "";
|
|
if ($flags & 4) {
|
|
// 2-byte length prefixed EXTRA data in header
|
|
if ($len - $headerlen - 2 < 8) {
|
|
return false; // invalid
|
|
}
|
|
$extralen = unpack("v",substr($data,8,2));
|
|
$extralen = $extralen[1];
|
|
if ($len - $headerlen - 2 - $extralen < 8) {
|
|
return false; // invalid
|
|
}
|
|
$extra = substr($data,10,$extralen);
|
|
$headerlen += 2 + $extralen;
|
|
}
|
|
$filenamelen = 0;
|
|
$filename = "";
|
|
if ($flags & 8) {
|
|
// C-style string
|
|
if ($len - $headerlen - 1 < 8) {
|
|
return false; // invalid
|
|
}
|
|
$filenamelen = strpos(substr($data,$headerlen),chr(0));
|
|
if ($filenamelen === false || $len - $headerlen - $filenamelen - 1 < 8) {
|
|
return false; // invalid
|
|
}
|
|
$filename = substr($data,$headerlen,$filenamelen);
|
|
$headerlen += $filenamelen + 1;
|
|
}
|
|
$commentlen = 0;
|
|
$comment = "";
|
|
if ($flags & 16) {
|
|
// C-style string COMMENT data in header
|
|
if ($len - $headerlen - 1 < 8) {
|
|
return false; // invalid
|
|
}
|
|
$commentlen = strpos(substr($data,$headerlen),chr(0));
|
|
if ($commentlen === false || $len - $headerlen - $commentlen - 1 < 8) {
|
|
return false; // Invalid header format
|
|
}
|
|
$comment = substr($data,$headerlen,$commentlen);
|
|
$headerlen += $commentlen + 1;
|
|
}
|
|
$headercrc = "";
|
|
if ($flags & 2) {
|
|
// 2-bytes (lowest order) of CRC32 on header present
|
|
if ($len - $headerlen - 2 < 8) {
|
|
return false; // invalid
|
|
}
|
|
$calccrc = crc32(substr($data,0,$headerlen)) & 0xffff;
|
|
$headercrc = unpack("v", substr($data,$headerlen,2));
|
|
$headercrc = $headercrc[1];
|
|
if ($headercrc != $calccrc) {
|
|
$error = "Header checksum failed.";
|
|
return false; // Bad header CRC
|
|
}
|
|
$headerlen += 2;
|
|
}
|
|
// GZIP FOOTER
|
|
$datacrc = unpack("V",substr($data,-8,4));
|
|
$datacrc = sprintf('%u',$datacrc[1] & 0xFFFFFFFF);
|
|
$isize = unpack("V",substr($data,-4));
|
|
$isize = $isize[1];
|
|
// decompression:
|
|
$bodylen = $len-$headerlen-8;
|
|
if ($bodylen < 1) {
|
|
// IMPLEMENTATION BUG!
|
|
return null;
|
|
}
|
|
$body = substr($data,$headerlen,$bodylen);
|
|
$data = "";
|
|
if ($bodylen > 0) {
|
|
switch ($method) {
|
|
case 8:
|
|
// Currently the only supported compression method:
|
|
$data = gzinflate($body,$maxlength);
|
|
break;
|
|
default:
|
|
$error = "Unknown compression method.";
|
|
return false;
|
|
}
|
|
} // zero-byte body content is allowed
|
|
// Verifiy CRC32
|
|
$crc = sprintf("%u",crc32($data));
|
|
$crcOK = $crc == $datacrc;
|
|
$lenOK = $isize == strlen($data);
|
|
if (!$lenOK || !$crcOK) {
|
|
$error = ( $lenOK ? '' : 'Length check FAILED. ') . ( $crcOK ? '' : 'Checksum FAILED.');
|
|
return false;
|
|
}
|
|
return $data;
|
|
}
|
|
}
|
|
?>
|