<?php
class Pureftp
{
	public $db;
	public $pwd;
	public $time;
	public $data_path='/home/wlx/qhhdata';
	
	function __construct()
	{
	}
	
	// deal with online & offline user
	// online user, the $user->path is a string, which is a path omit the $data_path (e.g., /test/data means the physical path is $data_path/test/data)
	// offline user, the $user->path is an array of string
	function createuser($user)
	{
		$this->insert_user($user);
		// add system link directory
		// use for same web server & ftp server
		/*
		if (is_array($user->path))
		{
			foreach ($user->path as $path)
				symlink($path,'/home/ftp/'.$user->username.'/'.str_replace('/','-',substr($path,strlen($this->data_path)+1)));
		} else {
			//online path, only one path
			symlink($this->data_path.$user->path,'/home/ftp/'.$user->username.'/'.str_replace('/','-',substr($user->path,1)));
		}
		*/
		//处理FTP用户目录
		if (!empty($user->host))
		{
			//vist $user->host web
			$page=file_get_contents('http://'.$user->host.'/proftp.php?'.$user->param);
			if (!empty($page)) die($page);//there are errors in visit ftp page
		}		
		return $this->update_pwd($user);
	}
	
	/*
	 * insert user into pureftp table
	 * param $user: username,
	 * return null
	 */
	private function insert_user($user)
	{
		//插入到pureftp表中
		$sql=$this->db->quoteInto("select * from pureftp where userid=?",$user->username);
		$u=$this->db->fetchRow($sql);
		if (empty($u))
		{
			$sql="insert into pureftp (userid,passwd,homedir) values('".$user->username."','".$user->password."','".'/home/ftp/'.$user->username."')";
			$this->db->query($sql);
			//create user home dir
			mkdir('/home/ftp/'.$user->username);
		}
	}
		
	/* 
	 * update password in the table used by pureftp
	 * param $user: password,id,time,username
	 * return: bool
	 */
	private function update_pwd($user)
	{
		$this->pwd=$user->password;//初始化
		$this->time=$user->time;
		//判断用户密码是否失效，或用户一次下载数据已经达到上限
		$sql=$this->db->quoteInto("select * from ftpuser where userid=?",$user->id);
		$u=$this->db->fetchRow($sql);
		if (empty($u)) {
			//插入ftpuser信息
			$sql="insert into ftpuser (userid,pwd,ts_created,ts_invalid,datacount) values(?,?,now(),?,1)";
			$this->db->query($sql,array($user->id,$user->password,$user->time));
			return true;
		} elseif (strtotime($u['ts_invalid'])<=time() or $u['datacount']<1) {
			//更新用户密码和数据计数
			$sql="update pureftp set passwd='".$user->password."' where userid='".$user->username."'";
			//$this->db->query($sql,array($user->password,$user->username));
			$this->db->query($sql); 
			$sql="update ftpuser set pwd=?,ts_created=now(),ts_invalid=?,datacount=1 where userid=?";
			$this->db->query($sql,array($user->password,$user->time,$user->id));
			return true;			
		} elseif (strtotime($u['ts_invalid'])>time()/* && $u['datacount']<$user->maxdata*/) {
			//更新数据计数
			//同步ftpuser和pureftp用户密码
			$sql="update ftpuser set ts_invalid=?,datacount=datacount+?,pwd=pureftp.passwd 
				from pureftp where ftpuser.userid=? and pureftp.userid=?";
			$this->db->query($sql,array($user->time,$user->datacount,$user->id,$user->username));
			$sql="select pwd,ts_invalid from ftpuser where userid=?";
			$u=$this->db->fetchRow($sql,array($user->id));
			$this->pwd=$u['pwd'];
			$this->time=$u['ts_invalid'];			
			return true;		
		} else //同时下载数据数超过限制
			return false;	
	}	
}
?>