server/apps/files_external/lib/ftp.php

<?php
/**
 * Copyright (c) 2012 Robin Appelman <icewind@owncloud.com>
 * This file is licensed under the Affero General Public License version 3 or
 * later.
 * See the COPYING-README file.
 */

class OC_FileStorage_FTP extends OC_FileStorage_StreamWrapper{
	private $password;
	private $user;
	private $host;
	private $secure;
	private $root;

	private static $tempFiles=array();

	public function __construct($params) {
		$this->host=$params['host'];
		$this->user=$params['user'];
		$this->password=$params['password'];
		if(isset($params['secure'])) {
			if(is_string($params['secure'])) {
				$this->secure = ($params['secure'] === 'true');
			}else{
				$this->secure = (bool)$params['secure'];
			}
		}else{
			$this->secure = false;
		}
		$this->root=isset($params['root'])?$params['root']:'/';
		if(!$this->root || $this->root[0]!='/') {
			$this->root='/'.$this->root;
		}
		//create the root folder if necesary
		if (!$this->is_dir('')) {
			$this->mkdir('');
		}
	}

	/**
	 * construct the ftp url
	 * @param string path
	 * @return string
	 */
	public function constructUrl($path) {
		$url='ftp';
		if($this->secure) {
			$url.='s';
		}
		$url.='://'.$this->user.':'.$this->password.'@'.$this->host.$this->root.$path;
		return $url;
	}
	public function fopen($path, $mode) {
		switch($mode) {
			case 'r':
			case 'rb':
			case 'w':
			case 'wb':
			case 'a':
			case 'ab':
				//these are supported by the wrapper
				$context = stream_context_create(array('ftp' => array('overwrite' => true)));
				return fopen($this->constructUrl($path), $mode, false, $context);
			case 'r+':
			case 'w+':
			case 'wb+':
			case 'a+':
			case 'x':
			case 'x+':
			case 'c':
			case 'c+':
				//emulate these
				if(strrpos($path, '.')!==false) {
					$ext=substr($path, strrpos($path, '.'));
				}else{
					$ext='';
				}
				$tmpFile=OCP\Files::tmpFile($ext);
				OC_CloseStreamWrapper::$callBacks[$tmpFile]=array($this, 'writeBack');
				if($this->file_exists($path)) {
					$this->getFile($path, $tmpFile);
				}
				self::$tempFiles[$tmpFile]=$path;
				return fopen('close://'.$tmpFile, $mode);
		}
	}

	public function writeBack($tmpFile) {
		if(isset(self::$tempFiles[$tmpFile])) {
			$this->uploadFile($tmpFile, self::$tempFiles[$tmpFile]);
			unlink($tmpFile);
		}
	}
}