csw-proxy.php
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<?php
// PHP CSW Proxy for CSW services.
// Responds to both HTTP GET and POST requests
//
// Author: Rob van Swol, NLR
// October 15th, 2008
//
include (dirname ( __FILE__ ) . "/../../ms_configura.php");
$logging = false;
/* Optionally write all requests in a log file */
if ($logging) {
$fh = fopen ( "lib/proxy.log", "ab+" );
$timestamp = strftime ( "[%Y-%m-%d %H:%M:%S]" );
}
$allowed_hosts = array ();
$doc = new DOMDocument ();
$doc->load ( './lib/xml/csw-hosts.xml' );
$hosts = $doc->getElementsByTagName ( "option" );
foreach ( $hosts as $host ) {
// $csw_host_id = trim($host->nodeValue);
$csw_host = trim ( $host->getAttribute ( "value" ) );
// echo $csw_host."\n";
array_push ( $allowed_hosts, $csw_host );
}
// Get the REST call path from the AJAX application
// Is it a POST or a GET?
$url = ($_POST ['csw_host']) ? $_POST ['csw_host'] : $_GET ['csw_host'];
// Check if $url is a known host
/*
if (! in_array ( $url, $allowed_hosts )) {
echo "not allowed";
if ($logging) {
fwrite ( $fh, $timestamp . ": refused request...\n" );
fwrite ( $fh, $timestamp . ": HOST NOT ALLOWED> " . $url . "\n" );
}
} else {
*/
if ($logging) {
fwrite ( $fh, $timestamp . ": incoming request...\n" );
fwrite ( $fh, $timestamp . ": HOST> " . $url . "\n" );
}
// Open the Curl session
$session = curl_init ( $url );
// If it's a POST, put the POST data in the body
if ($_POST ['csw_request']) {
// if (substr($_POST['csw_request'],0,5) == "<?xml") {
if (substr ( $_POST ['csw_request'], 0, 1 ) == "<") {
// Is magic quotes on?
if (get_magic_quotes_gpc ())
$xmlpost = stripslashes ( $_POST ['csw_request'] );
else
$xmlpost = $_POST ['csw_request'];
curl_setopt ( $session, CURLOPT_POST, true );
curl_setopt ( $session, CURLOPT_POSTFIELDS, $xmlpost );
if (isset ( $i3geo_proxy_server ) && $i3geo_proxy_server != "") {
curl_setopt ( $session, CURLOPT_PROXY, $i3geo_proxy_server );
}
curl_setopt ( $session, CURLOPT_HTTPHEADER, Array (
"Content-Type: application/xml"
) );
// curl_setopt ($session, CURLOPT_SSL_VERIFYPEER, 0);
if ($logging)
fwrite ( $fh, $timestamp . ": POST> " . $xmlpost . "\n" );
} else {
$postvars = '';
while ( $element = current ( $_POST ) ) {
if (key ( $_POST ) != "csw_request")
$postvars .= key ( $_POST ) . '=' . $element . '&';
else
$postvars .= $element . '&';
next ( $_POST );
}
curl_setopt ( $session, CURLOPT_POST, true );
curl_setopt ( $session, CURLOPT_POSTFIELDS, $_POST ['csw_request'] );
if (isset ( $i3geo_proxy_server ) && $i3geo_proxy_server != "") {
curl_setopt ( $session, CURLOPT_PROXY, $i3geo_proxy_server );
}
curl_setopt ( $session, CURLOPT_HTTPHEADER, Array (
"Content-Type: application/x-www-form-urlencoded"
) );
if ($logging)
fwrite ( $fh, $timestamp . ": POST> " . $_POST ['csw_request'] . "\n" );
}
} else if ($_GET ['csw_request']) {
curl_setopt ( $session, CURLOPT_POST, true );
curl_setopt ( $session, CURLOPT_POSTFIELDS, $_GET ['csw_request'] );
if (isset ( $i3geo_proxy_server ) && $i3geo_proxy_server != "") {
curl_setopt ( $session, CURLOPT_PROXY, $i3geo_proxy_server );
}
curl_setopt ( $session, CURLOPT_HTTPHEADER, Array (
"Content-Type: application/x-www-form-urlencoded"
) );
if ($logging)
fwrite ( $fh, $timestamp . ": GET> " . $_GET ['csw_request'] . "\n" );
}
// Don't return HTTP headers. Do return the contents of the call
curl_setopt ( $session, CURLOPT_HEADER, false );
curl_setopt ( $session, CURLOPT_RETURNTRANSFER, true );
// Make the call
$xml = curl_exec ( $session );
// The web service returns XML. Set the Content-Type appropriately
/*
* if(file_exists("c:/temp/csw.xml")){
* $fp = fopen("c:/temp/csw.xml","r");
* $xml = fread($fp,filesize("c:/temp/csw.xml"));
* fclose($fp);
* }
* else
* {$xml = curl_exec($session);}
*/
header ( "Content-Type: text/xml" );
if ($logging) {
fwrite ( $fh, $timestamp . ": RESPONSE> " . $xml . "\n" );
fclose ( $fh );
}
echo $xml;
curl_close ( $session );
//}
?>