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-rw-r--r--includes/filebackend/TempFSFile.php121
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+<?php
+/**
+ * Location holder of files stored temporarily
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ * @ingroup FileBackend
+ */
+
+/**
+ * This class is used to hold the location and do limited manipulation
+ * of files stored temporarily (this will be whatever wfTempDir() returns)
+ *
+ * @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 = '' ) {
+ wfProfileIn( __METHOD__ );
+ $base = wfTempDir() . '/' . $prefix . wfRandomString( 12 );
+ $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 >= 5 ) {
+ wfProfileOut( __METHOD__ );
+ return null; // give up
+ }
+ }
+ $tmpFile = new self( $path );
+ $tmpFile->canDelete = true; // safely instantiated
+ wfProfileOut( __METHOD__ );
+ 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;
+ }
+
+ /**
+ * Set flag clean up after the temporary file
+ *
+ * @return void
+ */
+ public function autocollect() {
+ $this->canDelete = true;
+ }
+
+ /**
+ * Cleans up after the temporary file by deleting it
+ */
+ function __destruct() {
+ if ( $this->canDelete ) {
+ wfSuppressWarnings();
+ unlink( $this->path );
+ wfRestoreWarnings();
+ }
+ }
+}