/**
* 'Opens' the requested file in the current window as an attachment,
* which pops up the "Save file as" dialog.
*
* @TODO test this to make sure it works in all browsers.
*
* @return void
*/
public function downloadScreenshot()
{
include_once HV_ROOT_DIR . '/../src/Database/ImgIndex.php';
include_once HV_ROOT_DIR . '/../src/Helper/HelioviewerLayers.php';
$imgIndex = new Database_ImgIndex();
$info = $imgIndex->getScreenshot($this->_params['id']);
$layers = new Helper_HelioviewerLayers($info['dataSourceString']);
$dir = sprintf('%s/screenshots/%s/%s/', HV_CACHE_DIR, str_replace('-', '/', substr($info['timestamp'], 0, 10)), $this->_params['id']);
$filename = sprintf('%s_%s.png', str_replace(array(':', '-', ' '), '_', $info['observationDate']), $layers->toString());
$filepath = $dir . $filename;
// If screenshot is no longer cached, regenerate it.
if (!@file_exists($filepath)) {
$this->reTakeScreenshot($this->_params['id']);
if (!@file_exists($filepath)) {
$filepath = str_replace(HV_CACHE_DIR, '', $filepath);
throw new Exception('Unable to locate the requested file: ' . $filepath, 24);
}
}
// Set HTTP headers
header('Pragma: public');
header('Expires: 0');
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
// required for certain browsers
header('Cache-Control: private', false);
header('Content-Disposition: attachment; filename="' . $filename . '"');
header('Content-Transfer-Encoding: binary');
header('Content-Length: ' . @filesize($filepath));
header('Content-type: image/png');
echo file_get_contents($filepath);
}