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| -rw-r--r-- | plugins/dokuwiki/inc/HTTPClient.php | 436 |
diff --git a/plugins/dokuwiki/inc/HTTPClient.php b/plugins/dokuwiki/inc/HTTPClient.php new file mode 100644 index 0000000..7a4d1e6 --- /dev/null +++ b/plugins/dokuwiki/inc/HTTPClient.php @@ -0,0 +1,436 @@ +<?php +/** + * HTTP Client + * + * @license GPL 2 (http://www.gnu.org/licenses/gpl.html) + * @author Andreas Goetz <cpuidle@gmx.de> + */ + +if(!defined('DOKU_INC')) define('DOKU_INC',realpath(dirname(__FILE__).'/../').'/'); +require_once(DOKU_CONF.'dokuwiki.php'); + +define('HTTP_NL',"\r\n"); + + +/** + * This class implements a basic HTTP client + * + * It supports POST and GET, Proxy usage, basic authentication, + * handles cookies and referers. It is based upon the httpclient + * function from the VideoDB project. + * + * @link http://www.splitbrain.org/go/videodb + * @author Andreas Goetz <cpuidle@gmx.de> + * @author Andreas Gohr <andi@splitbrain.org> + */ +class HTTPClient { + //set these if you like + var $agent; // User agent + var $http; // HTTP version defaults to 1.0 + var $timeout; // read timeout (seconds) + var $cookies; + var $referer; + var $max_redirect; + var $max_bodysize; // abort if the response body is bigger than this + var $header_regexp; // if set this RE must match against the headers, else abort + var $headers; + var $debug; + + // don't set these, read on error + var $error; + var $redirect_count; + + // read these after a successful request + var $resp_status; + var $resp_body; + var $resp_headers; + + // set these to do basic authentication + var $user; + var $pass; + + // set these if you need to use a proxy + var $proxy_host; + var $proxy_port; + var $proxy_user; + var $proxy_pass; + var $proxy_ssl; //boolean set to true if your proxy needs SSL + + /** + * Constructor. + * + * @author Andreas Gohr <andi@splitbrain.org> + */ + function __construct(){ + $this->agent = 'Mozilla/4.0 (compatible; DokuWiki HTTP Client; '.PHP_OS.')'; + $this->timeout = 15; + $this->cookies = array(); + $this->referer = ''; + $this->max_redirect = 3; + $this->redirect_count = 0; + $this->status = 0; + $this->headers = array(); + $this->http = '1.0'; + $this->debug = false; + $this->max_bodysize = 0; + $this->header_regexp= ''; + if(extension_loaded('zlib')) $this->headers['Accept-encoding'] = 'gzip'; + $this->headers['Accept'] = 'text/xml,application/xml,application/xhtml+xml,'. + 'text/html,text/plain,image/png,image/jpeg,image/gif,*/*'; + $this->headers['Accept-Language'] = 'en-us'; + } + + + /** + * Simple function to do a GET request + * + * Returns the wanted page or false on an error; + * + * @param string $url The URL to fetch + * @param bool $sloppy304 Return body on 304 not modified + * @author Andreas Gohr <andi@splitbrain.org> + */ + function get($url,$sloppy304=false){ + if(!$this->sendRequest($url)) return false; + if($this->status == 304 && $sloppy304) return $this->resp_body; + if($this->status != 200) return false; + return $this->resp_body; + } + + /** + * Simple function to do a POST request + * + * Returns the resulting page or false on an error; + * + * @author Andreas Gohr <andi@splitbrain.org> + */ + function post($url,$data){ + if(!$this->sendRequest($url,$data,'POST')) return false; + if($this->status != 200) return false; + return $this->resp_body; + } + + /** + * Do an HTTP request + * + * @author Andreas Goetz <cpuidle@gmx.de> + * @author Andreas Gohr <andi@splitbrain.org> + */ + function sendRequest($url,$data=array(),$method='GET'){ + $this->error = ''; + $this->status = 0; + + // parse URL into bits + $uri = parse_url($url); + $server = $uri['host']; + $path = $uri['path']; + if(empty($path)) $path = '/'; + if(!empty($uri['query'])) $path .= '?'.$uri['query']; + $port = $uri['port']; + if($uri['user']) $this->user = $uri['user']; + if($uri['pass']) $this->pass = $uri['pass']; + + // proxy setup + if($this->proxy_host){ + $request_url = $url; + $server = $this->proxy_host; + $port = $this->proxy_port; + if (empty($port)) $port = 8080; + }else{ + $request_url = $path; + $server = $server; + if (empty($port)) $port = ($uri['scheme'] == 'https') ? 443 : 80; + } + + // add SSL stream prefix if needed - needs SSL support in PHP + if($port == 443 || $this->proxy_ssl) $server = 'ssl://'.$server; + + // prepare headers + $headers = $this->headers; + $headers['Host'] = $uri['host']; + $headers['User-Agent'] = $this->agent; + $headers['Referer'] = $this->referer; + $headers['Connection'] = 'Close'; + if($method == 'POST'){ + $post = $this->_postEncode($data); + $headers['Content-Type'] = 'application/x-www-form-urlencoded'; + $headers['Content-Length'] = strlen($post); + } + if($this->user) { + $headers['Authorization'] = 'BASIC '.base64_encode($this->user.':'.$this->pass); + } + if($this->proxy_user) { + $headers['Proxy-Authorization'] = 'BASIC '.base64_encode($this->proxy_user.':'.$this->proxy_pass); + } + + // stop time + $start = time(); + + // open socket + $socket = @fsockopen($server,$port,$errno, $errstr, $this->timeout); + if (!$socket){ + $resp->status = '-100'; + $this->error = "Could not connect to $server:$port\n$errstr ($errno)"; + return false; + } + //set non blocking + stream_set_blocking($socket,0); + + // build request + $request = "$method $request_url HTTP/".$this->http.HTTP_NL; + $request .= $this->_buildHeaders($headers); + $request .= $this->_getCookies(); + $request .= HTTP_NL; + $request .= $post; + + $this->_debug('request',$request); + + // send request + fputs($socket, $request); + // read headers from socket + $r_headers = ''; + do{ + if(time()-$start > $this->timeout){ + $this->status = -100; + $this->error = 'Timeout while reading headers'; + return false; + } + if(feof($socket)){ + $this->error = 'Premature End of File (socket)'; + return false; + } + $r_headers .= fread($socket,1); #FIXME read full lines here? + }while(!preg_match('/\r\n\r\n$/',$r_headers)); + + $this->_debug('response headers',$r_headers); + + // check if expected body size exceeds allowance + if($this->max_bodysize && preg_match('/\r\nContent-Length:\s*(\d+)\r\n/i',$r_headers,$match)){ + if($match[1] > $this->max_bodysize){ + $this->error = 'Reported content length exceeds allowed response size'; + return false; + } + } + + // get Status + if (!preg_match('/^HTTP\/(\d\.\d)\s*(\d+).*?\n/', $r_headers, $m)) { + $this->error = 'Server returned bad answer'; + return false; + } + $this->status = $m[2]; + + // handle headers and cookies + $this->resp_headers = $this->_parseHeaders($r_headers); + if(isset($this->resp_headers['set-cookie'])){ + foreach ((array) $this->resp_headers['set-cookie'] as $c){ + list($key, $value, $foo) = explode('=', $cookie); + $this->cookies[$key] = $value; + } + } + + $this->_debug('Object headers',$this->resp_headers); + + // check server status code to follow redirect + if($this->status == 301 || $this->status == 302 ){ + if (empty($this->resp_headers['location'])){ + $this->error = 'Redirect but no Location Header found'; + return false; + }elseif($this->redirect_count == $this->max_redirect){ + $this->error = 'Maximum number of redirects exceeded'; + return false; + }else{ + $this->redirect_count++; + $this->referer = $url; + if (!preg_match('/^http/i', $this->resp_headers['location'])){ + $this->resp_headers['location'] = $uri['scheme'].'://'.$uri['host']. + $this->resp_headers['location']; + } + // perform redirected request, always via GET (required by RFC) + return $this->sendRequest($this->resp_headers['location'],array(),'GET'); + } + } + + // check if headers are as expected + if($this->header_regexp && !preg_match($this->header_regexp,$r_headers)){ + $this->error = 'The received headers did not match the given regexp'; + return false; + } + + //read body (with chunked encoding if needed) + $r_body = ''; + if(preg_match('/transfer\-(en)?coding:\s*chunked\r\n/i',$r_header)){ + do { + unset($chunk_size); + do { + if(feof($socket)){ + $this->error = 'Premature End of File (socket)'; + return false; + } + if(time()-$start > $this->timeout){ + $this->status = -100; + $this->error = 'Timeout while reading chunk'; + return false; + } + $byte = fread($socket,1); + $chunk_size .= $byte; + } while (preg_match('/[a-zA-Z0-9]/',$byte)); // read chunksize including \r + + $byte = fread($socket,1); // readtrailing \n + $chunk_size = hexdec($chunk_size); + $this_chunk = fread($socket,$chunk_size); + $r_body .= $this_chunk; + if ($chunk_size) $byte = fread($socket,2); // read trailing \r\n + + if($this->max_bodysize && strlen($r_body) > $this->max_bodysize){ + $this->error = 'Allowed response size exceeded'; + return false; + } + } while ($chunk_size); + }else{ + // read entire socket + while (!feof($socket)) { + if(time()-$start > $this->timeout){ + $this->status = -100; + $this->error = 'Timeout while reading response'; + return false; + } + $r_body .= fread($socket,4096); + if($this->max_bodysize && strlen($r_body) > $this->max_bodysize){ + $this->error = 'Allowed response size exceeded'; + return false; + } + } + } + + // close socket + $status = socket_get_status($socket); + fclose($socket); + + // decode gzip if needed + if($this->resp_headers['content-encoding'] == 'gzip'){ + $this->resp_body = gzinflate(substr($r_body, 10)); + }else{ + $this->resp_body = $r_body; + } + + $this->_debug('response body',$this->resp_body); + $this->redirect_count = 0; + return true; + } + + /** + * print debug info + * + * @author Andreas Gohr <andi@splitbrain.org> + */ + function _debug($info,$var){ + if(!$this->debug) return; + print '<b>'.$info.'</b><br />'; + ob_start(); + print_r($var); + $content = htmlspecialchars(ob_get_contents()); + ob_end_clean(); + print '<pre>'.$content.'</pre>'; + } + + /** + * convert given header string to Header array + * + * All Keys are lowercased. + * + * @author Andreas Gohr <andi@splitbrain.org> + */ + function _parseHeaders($string){ + $headers = array(); + $lines = explode("\n",$string); + foreach($lines as $line){ + list($key,$val) = explode(':',$line,2); + $key = strtolower(trim($key)); + $val = trim($val); + if(empty($val)) continue; + if(isset($headers[$key])){ + if(is_array($headers[$key])){ + $headers[$key][] = $val; + }else{ + $headers[$key] = array($headers[$key],$val); + } + }else{ + $headers[$key] = $val; + } + } + return $headers; + } + + /** + * convert given header array to header string + * + * @author Andreas Gohr <andi@splitbrain.org> + */ + function _buildHeaders($headers){ + $string = ''; + foreach($headers as $key => $value){ + if(empty($value)) continue; + $string .= $key.': '.$value.HTTP_NL; + } + return $string; + } + + /** + * get cookies as http header string + * + * @author Andreas Goetz <cpuidle@gmx.de> + */ + function _getCookies(){ + foreach ($this->cookies as $key => $val){ + if ($headers) $headers .= '; '; + $headers .= $key.'='.$val; + } + + if ($headers) $headers = "Cookie: $headers".HTTP_NL; + return $headers; + } + + /** + * Encode data for posting + * + * @todo handle mixed encoding for file upoads + * @author Andreas Gohr <andi@splitbrain.org> + */ + function _postEncode($data){ + foreach($data as $key => $val){ + if($url) $url .= '&'; + $url .= $key.'='.urlencode($val); + } + return $url; + } +} + + +/** + * Adds DokuWiki specific configs to the HTTP client + * + * @author Andreas Goetz <cpuidle@gmx.de> + */ +class DokuHTTPClient extends HTTPClient { + + /** + * Constructor. + * + * @author Andreas Gohr <andi@splitbrain.org> + */ + function __construct(){ + global $conf; + + // call parent constructor + parent::__construct(); + + // set some values from the config + $this->proxy_host = $conf['proxy']['host']; + $this->proxy_port = $conf['proxy']['port']; + $this->proxy_user = $conf['proxy']['user']; + $this->proxy_pass = $conf['proxy']['pass']; + $this->proxy_ssl = $conf['proxy']['ssl']; + } +} + +//Setup VIM: ex: et ts=4 enc=utf-8 : |