function displayGraphicFile($graphicFileName, $fileType = 'jpeg')
{
$fileModTime = filemtime($graphicFileName);
// Getting headers sent by the client.
$headers = getRequestHeaders();
// Checking if the client is validating his cache and if it is current.
if (isset($headers['If-Modified-Since']) && strtotime($headers['If-Modified-Since']) == $fileModTime) {
// Client's cache IS current, so we just respond '304 Not Modified'.
header('Last-Modified: ' . gmdate('D, d M Y H:i:s', $fileModTime) . ' GMT', true, 304);
} else {
// Image not cached or cache outdated, we respond '200 OK' and output the image.
header('Last-Modified: ' . gmdate('D, d M Y H:i:s', $fileModTime) . ' GMT', true, 200);
header('Content-type: image/' . $fileType);
header('Content-transfer-encoding: binary');
header('Content-length: ' . filesize($graphicFileName));
readfile($graphicFileName);
}
}
function getRelevantRequestHeaders() {
$headers = getRequestHeaders();
$relevantHeaders = array();
foreach ($headers as $header => $value) {
if ($header == "X-Authorization") {
$relevantHeaders[] = "Authorization: " . rawurldecode($value);
}
else if ($header == "User-Agent" || $header == "Accept" || $header == "Accept-Language" ||
$header == "Accept-Charset" || $header == "Content-Type") {
$relevantHeaders[] = $header. ": " . $value;
}
// || $header == "Accept-Encoding"
}
return $relevantHeaders;
}
// Return a 400 Bad Request response and exit
header('HTTP/1.1 400 Bad Request');
die;
}
// Get the endpoint URL
$url = $_GET['endpoint'] ? $_GET['endpoint'] : $_POST['endpoint'];
// If the URL is empty or is invalid, return the appropriate response
$isURLEmpty = empty($url);
$isURLValid = filter_var($url, FILTER_VALIDATE_URL) !== false;
if ($isURLEmpty || !$isURLValid) {
// Return a 400 Bad Request response and exit
header('HTTP/1.1 400 Bad Request');
die;
}
// Get the original request headers
$requestHeders = getRequestHeaders();
// Unset the headers that should not be forwarded by the proxy
unset($requestHeders['Host']);
unset($requestHeders['Content-Length']);
unset($requestHeders['Connection']);
// Add the Content-Type header based on the original content type
if (isset($_SERVER['CONTENT_TYPE'])) {
$requestHeders['Content-Type'] = $_SERVER['CONTENT_TYPE'];
}
// Add the X-Forwarded-For header
$requestHeders['X-Forwarded-For'] = isset($requestHeders['X-Forwarded-For']) ? $senderIP . ',' . $requestHeders['X-Forwarded-For'] : $senderIP;
// Initialize the data that should be forwarded
$data = array();
if ($requestMethod === 'GET') {
// Get the original parameters sent via GET
$data = $_GET;
/**
* Odesle hotovy souboru
* @param string $file
*/
function sendFile($file)
{
if (!is_file($file)) {
send404();
}
$fileModTime = max(filemtime($file), filectime($file));
$headers = getRequestHeaders();
if (isset($headers['If-Modified-Since']) && strtotime($headers['If-Modified-Since']) == $fileModTime) {
header('Last-Modified: ' . gmdate('D, d M Y H:i:s', $fileModTime) . ' GMT', true, 304);
} else {
header('Last-Modified: ' . gmdate('D, d M Y H:i:s', $fileModTime) . ' GMT', true, 200);
header('Content-type: image/jpeg');
header('Content-transfer-encoding: binary');
header('Content-length: ' . filesize($file));
readfile($file);
}
exit;
}
