/**
* Is called with an array of files and timestamps to check if the file ages
* have changed since these timestamps.
*
* Returns null when nothing changed or a structure of the changed objects
*/
protected function checkFilesChanged($files)
{
global $AUTHORISATION, $CORE;
$changed = array();
foreach ($files as $file) {
$parts = explode(',', $file);
// Skip invalid requested files
if (count($parts) != 3) {
continue;
}
list($ty, $name, $age) = $parts;
$age = (int) $age;
// Try to fetch the current age of the requested file
$cur_age = null;
if ($ty == 'maincfg') {
$cur_age = $CORE->getMainCfg()->getConfigFileAge();
} elseif ($ty == 'map') {
if ($AUTHORISATION->isPermitted('Map', 'view', $name)) {
$MAPCFG = new GlobalMapCfg($name);
$MAPCFG->readMapConfig();
$cur_age = $MAPCFG->getFileModificationTime($age);
}
}
// Check if the file has changed; Reply with the changed timestamps
if ($cur_age !== null && $cur_age > $age) {
$changed[$name] = $cur_age;
}
}
if (count($changed) > 0) {
return json_encode(array('status' => 'CHANGED', 'data' => $changed));
} else {
return null;
}
}