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Supports user authentication and better error handling #23

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Supports user authentication and better error handling #23

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56 changes: 31 additions & 25 deletions proxy.php
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Original file line number Diff line number Diff line change
Expand Up @@ -47,13 +47,10 @@

// identify request headers
$request_headers = array( );
foreach ($_SERVER as $key => $value) {
if (strpos($key, 'HTTP_') === 0 || strpos($key, 'CONTENT_') === 0) {
$headername = str_replace('_', ' ', str_replace('HTTP_', '', $key));
$headername = str_replace(' ', '-', ucwords(strtolower($headername)));
if (!in_array($headername, array( 'Host', 'X-Proxy-Url' ))) {
$request_headers[] = "$headername: $value";
}
foreach (getallheaders() as $key => $value) {
$headername = ucwords($key);
if (!in_array($headername, array( 'Host', 'X-Proxy-URL' ))) {
$request_headers[] = "$headername: $value";
}
}

Expand All @@ -77,9 +74,9 @@

// Get URL from `csurl` in GET or POST data, before falling back to X-Proxy-URL header.
if (isset($_REQUEST['csurl'])) {
$request_url = urldecode($_REQUEST['csurl']);
$request_url = $_REQUEST['csurl'];
} elseif (isset($_SERVER['HTTP_X_PROXY_URL'])) {
$request_url = urldecode($_SERVER['HTTP_X_PROXY_URL']);
$request_url = $_SERVER['HTTP_X_PROXY_URL'];
} else {
header($_SERVER['SERVER_PROTOCOL'] . ' 404 Not Found');
header('Status: 404 Not Found');
Expand Down Expand Up @@ -125,7 +122,6 @@
if ($request_method == 'GET' && count($request_params) > 0 && (!array_key_exists('query', $p_request_url) || empty($p_request_url['query']))) {
$request_url .= '?' . http_build_query($request_params);
}

// let the request begin
$ch = curl_init($request_url);
curl_setopt($ch, CURLOPT_HTTPHEADER, $request_headers); // (re-)send headers
Expand All @@ -148,26 +144,36 @@

// retrieve response (headers and content)
$response = curl_exec($ch);

if ($response === false) {
header('Content-Type: text/plain');
print 'Curl error: ' . curl_error($ch);
}

curl_close($ch);

// split response to header and content
list($response_headers, $response_content) = preg_split('/(\r\n){2}/', $response, 2);

// (re-)send the headers
$response_headers = preg_split('/(\r\n){1}/', $response_headers);
foreach ($response_headers as $key => $response_header) {
// Rewrite the `Location` header, so clients will also use the proxy for redirects.
if (preg_match('/^Location:/', $response_header)) {
list($header, $value) = preg_split('/: /', $response_header, 2);
$response_header = 'Location: ' . $_SERVER['REQUEST_URI'] . '?csurl=' . $value;
}
if (!preg_match('/^(Transfer-Encoding):/', $response_header)) {
header($response_header, false);
$split_response = preg_split('/(\r\n){2}/', $response, 2);

if (sizeof($split_response) == 2) {
$response_headers = preg_split('/(\r\n){1}/', $split_response[0]);
$response_content = $split_response[1];

// (re-)send the headers
foreach ($response_headers as $key => $response_header) {
// Rewrite the `Location` header, so clients will also use the proxy for redirects.
if (preg_match('/^Location:/', $response_header)) {
list($header, $value) = preg_split('/: /', $response_header, 2);
$response_header = 'Location: ' . $_SERVER['REQUEST_URI'] . '?csurl=' . $value;
}
if (!preg_match('/^(Transfer-Encoding):/', $response_header)) {
header($response_header, false);
}
}
}

// finally, output the content
print($response_content);
// finally, output the content
print($response_content);
}

function csajax_debug_message($message)
{
Expand Down