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<?php
/**
* @file
* @ingroup FileBackend
*/
/**
* This class is used to hold the location and do limited manipulation
* of files stored temporarily (usually this will be $wgTmpDirectory)
*
* @ingroup FileBackend
*/
class TempFSFile extends FSFile {
protected $canDelete = false; // bool; garbage collect the temp file
/** @var Array of active temp files to purge on shutdown */
protected static $instances = array();
/**
* Make a new temporary file on the file system.
* Temporary files may be purged when the file object falls out of scope.
*
* @param $prefix string
* @param $extension string
* @return TempFSFile|null
*/
public static function factory( $prefix, $extension = '' ) {
$base = wfTempDir() . '/' . $prefix . dechex( mt_rand( 0, 99999999 ) );
$ext = ( $extension != '' ) ? ".{$extension}" : "";
for ( $attempt = 1; true; $attempt++ ) {
$path = "{$base}-{$attempt}{$ext}";
wfSuppressWarnings();
$newFileHandle = fopen( $path, 'x' );
wfRestoreWarnings();
if ( $newFileHandle ) {
fclose( $newFileHandle );
break; // got it
}
if ( $attempt >= 15 ) {
return null; // give up
}
}
$tmpFile = new self( $path );
$tmpFile->canDelete = true; // safely instantiated
return $tmpFile;
}
/**
* Purge this file off the file system
*
* @return bool Success
*/
public function purge() {
$this->canDelete = false; // done
wfSuppressWarnings();
$ok = unlink( $this->path );
wfRestoreWarnings();
return $ok;
}
/**
* Clean up the temporary file only after an object goes out of scope
*
* @param $object Object
* @return void
*/
public function bind( $object ) {
if ( is_object( $object ) ) {
$object->tempFSFileReferences[] = $this;
}
}
/**
* Set flag to not clean up after the temporary file
*
* @return void
*/
public function preserve() {
$this->canDelete = false;
}
/**
* Cleans up after the temporary file by deleting it
*/
function __destruct() {
if ( $this->canDelete ) {
wfSuppressWarnings();
unlink( $this->path );
wfRestoreWarnings();
}
}
}
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