function getImageStamp($matches)
{
$requestedFormat = $_GET['format'];
$file = base64_decode($matches[1]);
$stampPath = PccConfig::getImageStampPath();
$filepath = $stampPath . $file;
if (!file_exists($filepath)) {
throw new Exception('Image not found.');
}
$fileParts = explode('.', $file);
$sourceImageFormat = strtolower($fileParts[1]);
$acceptableFormats = explode(',', str_replace('.', '', PccConfig::getValidImageStampTypes()));
if (!in_array($sourceImageFormat, $acceptableFormats)) {
throw new Exception('Image format is not valid.');
}
$lastModifiedTime = filemtime($filepath);
if ($lastModifiedTime === false) {
throw new Exception('Modify date unknown');
}
if (array_key_exists('HTTP_IF_MODIFIED_SINCE', $_SERVER)) {
$ifModifiedSinceTime = strtotime(preg_replace('/;.*$/', '', $_SERVER['HTTP_IF_MODIFIED_SINCE']));
if ($ifModifiedSinceTime >= $lastModifiedTime) {
// Is the Cached version the most recent?
header($_SERVER['SERVER_PROTOCOL'] . ' 304 Not Modified');
return;
}
}
header('Last-Modified: ' . date('r', $lastModifiedTime));
header('Pragma: public');
header('Cache-Control: max-age=86400');
header('Expires: ' . gmdate('D, d M Y H:i:s \\G\\M\\T', time() + 86400));
if ($requestedFormat == 'Base64') {
$outputFormat = $requestedFormat;
} else {
$outputFormat = $sourceImageFormat;
}
$ext = strtolower(array_pop(explode('.', $filepath)));
$mime_types = array('png' => 'image/png', 'jpeg' => 'image/jpeg', 'jpg' => 'image/jpeg', 'gif' => 'image/gif');
if (array_key_exists($ext, $mime_types)) {
$imageType = $mime_types[$ext];
} else {
throw new Exception('Image type not supported.');
}
switch ($outputFormat) {
case 'gif':
case 'jpg':
case 'jpeg':
case 'png':
header("Content-Type: {$imageType}");
echo file_get_contents($filepath);
break;
case 'Base64':
header("Content-Type: application/json");
$base64Data = base64_encode(file_get_contents($filepath));
echo json_encode(array('dataHash' => sha1($base64Data), 'dataUrl' => 'data: ' . $imageType . ';base64,' . $base64Data));
break;
}
}
