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| <?php
// proxy http
// auteur: Marc Gauthier
// 02/09/2009
// http://www.papygeek.com/download/53/
// Transfer-Encoding: chunked
$debug = 1;
$sUrl = '';
$sReponse = '';
// via un proxy
$proxy_port = 80;
$proxy_host = '';
if ($_SERVER["REQUEST_METHOD"] === 'GET' && isset($_REQUEST["url"]) ) {
$sUrl = $_REQUEST["url"];
debug("GET url:$sUrl");
proxy($sUrl);
exit;
}
phpinfo(INFO_VARIABLES);exit;
function proxy($sUrl) {
global $proxy_host,$proxy_port;
$aUrl = @parse_url($sUrl);
if ( ! isset($aUrl['scheme']) ) {
confess("proxy scheme");
}
// construction de la requete
$sReq = "GET $sUrl HTTP/1.0\r\n" .
'Host: ' . $aUrl['host'] . ($aUrl['port'] ? ':'. $aUrl['port'] : '') .
"\r\nConnection: close\r\n\r\n";
if ( empty($proxy_host)) {
$host = $aUrl["host"];
$port = $aUrl["port"] ? $aUrl["port"] : 80;
} else {
$host = $proxy_host;
$port = $proxy_port;
}
debug("host:$host port:$port");
$fp = @fsockopen ($host, $port, $errno, $errstr, 5);
if (!$fp) {
confess("fsockopen failed: $errstr ($errno)");
}
debug("sReq:$sReq");
fwrite($fp, $sReq);
debug("before loop");
$headers_processed = 0;
$reponse = '';
$strip_header = 1;
$set_content_type = 1;
$chunked = 0;
ob_start();
while (!feof($fp)) {
$r = fread($fp, 4096);
#debug("in loop: $r");
if ($strip_header && !$headers_processed) {
#debug("in loop strip headers: $r");
debug("trying to find end of headers");
$response .= $r;
$nlnl = strpos($response, "\r\n\r\n");
$add = 4;
if (!$nlnl) {
$nlnl = strpos($response, "\n\n");
$add = 2;
}
if (!$nlnl) continue;
debug("end of headers found");
// Transfer-Encoding: chunked
if ($set_content_type) {
debug("extracting content-type");
$headers = substr($response, 0, $nlnl);
debug("headers: $headers");
if ( ! valideHeaders($headers) ) {
confess("headers");
}
if (preg_match_all('/^(Content-.*?)(\r?\n|$)/ims', $headers, $matches)) {
for ($i = 0; $i < count($matches[0]); ++$i) {
$ct = $matches[1][$i];
debug("header($ct)");
header($ct);
}
}
}
$response = substr($response, $nlnl+$add);
if ( $chunked ) {
$nlnl = strpos($response, "\r\n<?xml");
if ($nlnl) {
$response = substr($response, $nlnl+2);
}
}
debug("header post:".substr($response,0,20));
print $response;
$headers_processed = 1;
} else {
print $r;
}
}
fclose ($fp);
debug("after loop");
}
//
// on valide les headers
function valideHeaders($header=null) {
$headers = explode("\n",$header);
if (!is_array($headers) or count($headers) < 1) {
return false;
}
switch(trim(strtolower($headers[0]))) {
case 'http/1.0 100 ok':
case 'http/1.0 200 ok':
case 'http/1.1 100 ok':
case 'http/1.1 200 ok':
return true;
break;
}
return false;
}
//
// mode chunk
//
// la chaine "str" peut contenir plusieurs chunks
function unchunk($str=null) {
global $sReponse;
if (!is_string($str)) {
confess("unchunk string");
}
// on ajoute au reliquat precedent
$sReponse .= $str;
$eol = "\r\n";
$add = strlen($eol);
$tmp = $sReponse;
$str = '';
// on recherche les chunks
do {
$tmp = ltrim($tmp);
$pos = strpos($tmp, $eol);
if ($pos === false) {
confess("unchunk eol");
}
$len = hexdec(substr($tmp,0,$pos));
if (!is_numeric($len) or $len < 0) {
confess("unchunk len:$len");
}
// on a tout dans le buffer
if ( strlen($tmp) < ($pos + $add + $len) ) {
// pour la prochaine fois
$sReponse = $tmp;
return;
}
$str = substr($tmp, ($pos + $add), $len);
print $str;
$sReponse = substr($tmp, ($len + $pos + $add));
$check = trim($sReponse);
} while(!empty($check));
unset($tmp);
unset($str);
return;
}
function confess($msg) {
debug($msg);
header("HTTP/1.0 500 $msg");
exit;
}
function debug($msg) {
global $debug;
if ($debug) error_log(__FILE__.": $msg", 0);
}
?> |
pre 1.0beta5: geoportalLike
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