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EDIT :: class-wp-filesystem-ftpsockets.php

<?php
/**
 * WordPress FTP Sockets Filesystem.
 *
 * @package WordPress
 * @subpackage Filesystem
 */

/**
 * WordPress Filesystem Class for implementing FTP Sockets.
 *
 * @since 2.5.0
 *
 * @see WP_Filesystem_Base
 */
class WP_Filesystem_ftpsockets extends WP_Filesystem_Base {
	/**
	 * @var ftp
	 */
	public $ftp;

/**
	 * @param array $opt
	 */
	public function __construct( $opt = '' ) {
		$this->method = 'ftpsockets';
		$this->errors = new WP_Error();

// Check if possible to use ftp functions.
		if ( ! @include_once( ABSPATH . 'site-admin/includes/class-ftp.php' ) ) {
			return;
		}
		$this->ftp = new ftp();

if ( empty( $opt['port'] ) ) {
			$this->options['port'] = 21;
		} else {
			$this->options['port'] = (int) $opt['port'];
		}

if ( empty( $opt['hostname'] ) ) {
			$this->errors->add( 'empty_hostname', __( 'FTP hostname is required' ) );
		} else {
			$this->options['hostname'] = $opt['hostname'];
		}

// Check if the options provided are OK.
		if ( empty( $opt['username'] ) ) {
			$this->errors->add( 'empty_username', __( 'FTP username is required' ) );
		} else {
			$this->options['username'] = $opt['username'];
		}

if ( empty( $opt['password'] ) ) {
			$this->errors->add( 'empty_password', __( 'FTP password is required' ) );
		} else {
			$this->options['password'] = $opt['password'];
		}
	}

/**
	 * @return bool
	 */
	public function connect() {
		if ( ! $this->ftp ) {
			return false;
		}

$this->ftp->setTimeout( FS_CONNECT_TIMEOUT );

if ( ! $this->ftp->SetServer( $this->options['hostname'], $this->options['port'] ) ) {
			$this->errors->add(
				'connect',
				/* translators: %s: hostname:port */
				sprintf(
					__( 'Failed to connect to FTP Server %s' ),
					$this->options['hostname'] . ':' . $this->options['port']
				)
			);
			return false;
		}

if ( ! $this->ftp->connect() ) {
			$this->errors->add(
				'connect',
				/* translators: %s: hostname:port */
				sprintf(
					__( 'Failed to connect to FTP Server %s' ),
					$this->options['hostname'] . ':' . $this->options['port']
				)
			);
			return false;
		}

if ( ! $this->ftp->login( $this->options['username'], $this->options['password'] ) ) {
			$this->errors->add(
				'auth',
				/* translators: %s: username */
				sprintf(
					__( 'Username/Password incorrect for %s' ),
					$this->options['username']
				)
			);
			return false;
		}

$this->ftp->SetType( FTP_BINARY );
		$this->ftp->Passive( true );
		$this->ftp->setTimeout( FS_TIMEOUT );
		return true;
	}

/**
	 * Retrieves the file contents.
	 *
	 * @since 2.5.0
	 *
	 * @param string $file Filename.
	 * @return string|false File contents on success, false if no temp file could be opened,
	 *                      or if the file doesn't exist.
	 */
	public function get_contents( $file ) {
		if ( ! $this->exists( $file ) ) {
			return false;
		}

$temp = wp_tempnam( $file );

if ( ! $temphandle = fopen( $temp, 'w+' ) ) {
			unlink( $temp );
			return false;
		}

mbstring_binary_safe_encoding();

if ( ! $this->ftp->fget( $temphandle, $file ) ) {
			fclose( $temphandle );
			unlink( $temp );

reset_mbstring_encoding();

return ''; // Blank document, File does exist, It's just blank.
		}

reset_mbstring_encoding();

fseek( $temphandle, 0 ); // Skip back to the start of the file being written to
		$contents = '';

while ( ! feof( $temphandle ) ) {
			$contents .= fread( $temphandle, 8192 );
		}

fclose( $temphandle );
		unlink( $temp );
		return $contents;
	}

/**
	 * @param string $file
	 * @return array
	 */
	public function get_contents_array( $file ) {
		return explode( "\n", $this->get_contents( $file ) );
	}

/**
	 * @param string $file
	 * @param string $contents
	 * @param int|bool $mode
	 * @return bool
	 */
	public function put_contents( $file, $contents, $mode = false ) {
		$temp = wp_tempnam( $file );
		if ( ! $temphandle = @fopen( $temp, 'w+' ) ) {
			unlink( $temp );
			return false;
		}

// The FTP class uses string functions internally during file download/upload
		mbstring_binary_safe_encoding();

$bytes_written = fwrite( $temphandle, $contents );
		if ( false === $bytes_written || $bytes_written != strlen( $contents ) ) {
			fclose( $temphandle );
			unlink( $temp );

reset_mbstring_encoding();

return false;
		}

fseek( $temphandle, 0 ); // Skip back to the start of the file being written to

$ret = $this->ftp->fput( $file, $temphandle );

reset_mbstring_encoding();

fclose( $temphandle );
		unlink( $temp );

$this->chmod( $file, $mode );

return $ret;
	}

/**
	 * @return string
	 */
	public function cwd() {
		$cwd = $this->ftp->pwd();
		if ( $cwd ) {
			$cwd = trailingslashit( $cwd );
		}
		return $cwd;
	}

/**
	 * @param string $file
	 * @return bool
	 */
	public function chdir( $file ) {
		return $this->ftp->chdir( $file );
	}

/**
	 * @param string $file
	 * @param int|bool $mode
	 * @param bool $recursive
	 * @return bool
	 */
	public function chmod( $file, $mode = false, $recursive = false ) {
		if ( ! $mode ) {
			if ( $this->is_file( $file ) ) {
				$mode = FS_CHMOD_FILE;
			} elseif ( $this->is_dir( $file ) ) {
				$mode = FS_CHMOD_DIR;
			} else {
				return false;
			}
		}

// chmod any sub-objects if recursive.
		if ( $recursive && $this->is_dir( $file ) ) {
			$filelist = $this->dirlist( $file );
			foreach ( (array) $filelist as $filename => $filemeta ) {
				$this->chmod( $file . '/' . $filename, $mode, $recursive );
			}
		}

// chmod the file or directory
		return $this->ftp->chmod( $file, $mode );
	}

/**
	 * @param string $file
	 * @return string
	 */
	public function owner( $file ) {
		$dir = $this->dirlist( $file );
		return $dir[ $file ]['owner'];
	}

/**
	 * @param string $file
	 * @return string
	 */
	public function getchmod( $file ) {
		$dir = $this->dirlist( $file );
		return $dir[ $file ]['permsn'];
	}

/**
	 * @param string $file
	 * @return string
	 */
	public function group( $file ) {
		$dir = $this->dirlist( $file );
		return $dir[ $file ]['group'];
	}

/**
	 * @param string   $source
	 * @param string   $destination
	 * @param bool     $overwrite
	 * @param int|bool $mode
	 * @return bool
	 */
	public function copy( $source, $destination, $overwrite = false, $mode = false ) {
		if ( ! $overwrite && $this->exists( $destination ) ) {
			return false;
		}

$content = $this->get_contents( $source );
		if ( false === $content ) {
			return false;
		}

return $this->put_contents( $destination, $content, $mode );
	}

/**
	 * @param string $source
	 * @param string $destination
	 * @param bool   $overwrite
	 * @return bool
	 */
	public function move( $source, $destination, $overwrite = false ) {
		return $this->ftp->rename( $source, $destination );
	}

/**
	 * @param string $file
	 * @param bool   $recursive
	 * @param string $type
	 * @return bool
	 */
	public function delete( $file, $recursive = false, $type = false ) {
		if ( empty( $file ) ) {
			return false;
		}
		if ( 'f' == $type || $this->is_file( $file ) ) {
			return $this->ftp->delete( $file );
		}
		if ( ! $recursive ) {
			return $this->ftp->rmdir( $file );
		}

return $this->ftp->mdel( $file );
	}

/**
	 * @param string $file
	 * @return bool
	 */
	public function exists( $file ) {
		$list = $this->ftp->nlist( $file );

if ( empty( $list ) && $this->is_dir( $file ) ) {
			return true; // File is an empty directory.
		}

return ! empty( $list ); //empty list = no file, so invert.
		// Return $this->ftp->is_exists($file); has issues with ABOR+426 responses on the ncFTPd server.
	}

/**
	 * @param string $file
	 * @return bool
	 */
	public function is_file( $file ) {
		if ( $this->is_dir( $file ) ) {
			return false;
		}
		if ( $this->exists( $file ) ) {
			return true;
		}
		return false;
	}

/**
	 * @param string $path
	 * @return bool
	 */
	public function is_dir( $path ) {
		$cwd = $this->cwd();
		if ( $this->chdir( $path ) ) {
			$this->chdir( $cwd );
			return true;
		}
		return false;
	}

/**
	 * @param string $file
	 * @return bool
	 */
	public function is_readable( $file ) {
		return true;
	}

/**
	 * @param string $file
	 * @return bool
	 */
	public function is_writable( $file ) {
		return true;
	}

/**
	 * @param string $file
	 * @return bool
	 */
	public function atime( $file ) {
		return false;
	}

/**
	 * @param string $file
	 * @return int
	 */
	public function mtime( $file ) {
		return $this->ftp->mdtm( $file );
	}

/**
	 * @param string $file
	 * @return int
	 */
	public function size( $file ) {
		return $this->ftp->filesize( $file );
	}

/**
	 * @param string $file
	 * @param int $time
	 * @param int $atime
	 * @return bool
	 */
	public function touch( $file, $time = 0, $atime = 0 ) {
		return false;
	}

/**
	 * @param string $path
	 * @param mixed  $chmod
	 * @param mixed  $chown
	 * @param mixed  $chgrp
	 * @return bool
	 */
	public function mkdir( $path, $chmod = false, $chown = false, $chgrp = false ) {
		$path = untrailingslashit( $path );
		if ( empty( $path ) ) {
			return false;
		}

if ( ! $this->ftp->mkdir( $path ) ) {
			return false;
		}
		if ( ! $chmod ) {
			$chmod = FS_CHMOD_DIR;
		}
		$this->chmod( $path, $chmod );
		return true;
	}

/**
	 * @param string $path
	 * @param bool $recursive
	 * @return bool
	 */
	public function rmdir( $path, $recursive = false ) {
		return $this->delete( $path, $recursive );
	}

/**
	 * @param string $path
	 * @param bool   $include_hidden
	 * @param bool   $recursive
	 * @return bool|array
	 */
	public function dirlist( $path = '.', $include_hidden = true, $recursive = false ) {
		if ( $this->is_file( $path ) ) {
			$limit_file = basename( $path );
			$path       = dirname( $path ) . '/';
		} else {
			$limit_file = false;
		}

mbstring_binary_safe_encoding();

$list = $this->ftp->dirlist( $path );
		if ( empty( $list ) && ! $this->exists( $path ) ) {

reset_mbstring_encoding();

return false;
		}

$ret = array();
		foreach ( $list as $struc ) {

if ( '.' == $struc['name'] || '..' == $struc['name'] ) {
				continue;
			}

if ( ! $include_hidden && '.' == $struc['name'][0] ) {
				continue;
			}

if ( $limit_file && $struc['name'] != $limit_file ) {
				continue;
			}

if ( 'd' == $struc['type'] ) {
				if ( $recursive ) {
					$struc['files'] = $this->dirlist( $path . '/' . $struc['name'], $include_hidden, $recursive );
				} else {
					$struc['files'] = array();
				}
			}

// Replace symlinks formatted as "source -> target" with just the source name
			if ( $struc['islink'] ) {
				$struc['name'] = preg_replace( '/(\s*->\s*.*)$/', '', $struc['name'] );
			}

// Add the Octal representation of the file permissions
			$struc['permsn'] = $this->getnumchmodfromh( $struc['perms'] );

$ret[ $struc['name'] ] = $struc;
		}

reset_mbstring_encoding();

return $ret;
	}

/**
	 */
	public function __destruct() {
		$this->ftp->quit();
	}
}

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EDIT :: class-wp-filesystem-ftpsockets.php