installed plugin W3 Total Cache version 2.3.2

wp-content/plugins/w3-total-cache/Cache_File_Cleaner.php

@@ -0,0 +1,116 @@
+<?php
+namespace W3TC;
+
+/**
+ * File cache cleaner class
+ */
+class Cache_File_Cleaner {
+	/**
+	 * Cache directory
+	 *
+	 * @var string
+	 */
+	var $_cache_dir = '';
+
+	/**
+	 * Clean operation time limit
+	 *
+	 * @var int
+	 */
+	var $_clean_timelimit = 0;
+
+	/**
+	 * Exclude files
+	 *
+	 * @var array
+	 */
+	var $_exclude = array();
+
+	/**
+	 * PHP5-style constructor
+	 *
+	 * @param array   $config
+	 */
+	function __construct( $config = array() ) {
+		$this->_cache_dir = ( isset( $config['cache_dir'] ) ? trim( $config['cache_dir'] ) : 'cache' );
+		$this->_clean_timelimit = ( isset( $config['clean_timelimit'] ) ? (int) $config['clean_timelimit'] : 180 );
+		$this->_exclude = ( isset( $config['exclude'] ) ? (array) $config['exclude'] : array() );
+	}
+
+	/**
+	 * Run clean operation
+	 *
+	 * @return boolean
+	 */
+	function clean() {
+		@set_time_limit( $this->_clean_timelimit );
+
+		$this->_clean( $this->_cache_dir, false );
+	}
+
+	/**
+	 * Clean
+	 *
+	 * @param string  $path
+	 * @param bool    $remove
+	 * @return void
+	 */
+	function _clean( $path, $remove = true ) {
+		$dir = @opendir( $path );
+
+		if ( $dir ) {
+			while ( ( $entry = @readdir( $dir ) ) !== false ) {
+				if ( $entry == '.' || $entry == '..' ) {
+					continue;
+				}
+
+				foreach ( $this->_exclude as $mask ) {
+					if ( fnmatch( $mask, basename( $entry ) ) ) {
+						continue 2;
+					}
+				}
+
+				$full_path = $path . DIRECTORY_SEPARATOR . $entry;
+
+				if ( @is_dir( $full_path ) ) {
+					$this->_clean( $full_path );
+				} elseif ( !$this->is_valid( $full_path ) ) {
+					@unlink( $full_path );
+				}
+			}
+
+			@closedir( $dir );
+
+			if ( $remove ) {
+				@rmdir( $path );
+			}
+		}
+	}
+
+	/**
+	 * Check if file is valid
+	 *
+	 * @param string  $file
+	 * @return bool
+	 */
+	function is_valid( $file ) {
+		$valid = false;
+
+		if ( file_exists( $file ) ) {
+			$fp = @fopen( $file, 'rb' );
+
+			if ( $fp ) {
+				$expires = @fread( $fp, 4 );
+
+				if ( $expires !== false ) {
+					list( , $expires_at ) = @unpack( 'L', $expires );
+					$valid = ( time() < $expires_at );
+				}
+
+				@fclose( $fp );
+			}
+		}
+
+		return $valid;
+	}
+}