/**
* Defined by Zend\Filter\Filter
*
* Encrypts the file $value with the defined settings
*
* @param string $value Full path of file to change
* @return string The filename which has been set, or false when there were errors
*/
public function _invoke($value)
{
if (!file_exists($value)) {
throw new Filter\Exception("File '{$value}' not found");
}
if (!isset($this->_filename)) {
$this->_filename = $value;
}
if (file_exists($this->_filename) and !is_writable($this->_filename)) {
throw new Filter\Exception("File '{$this->_filename}' is not writable");
}
$content = file_get_contents($value);
if (!$content) {
throw new Filter\Exception("Problem while reading file '{$value}'");
}
$encrypted = parent::__invoke($content);
$result = file_put_contents($this->_filename, $encrypted);
if (!$result) {
throw new Filter\Exception("Problem while writing file '{$this->_filename}'");
}
return $this->_filename;
}
