ftpserver

ftpserver

Simple and extensible promise-based FTP server.

Index

• Installation
• Usage
  • Options
• Features
  • Classes
    • File
  • Override
    • Authentication
    • File System
• Contribution
• Resources

Installation

npm install ftpserver --save

Usage

import {FTPServer} from 'ftpserver';
const ftpServer = new FTPServer({...});

ftpServer.listen().then(() => {
  // now listening for connections
});

listen() to start the server.
close() to stop.

You can pass an object to the constructor to set various options. Below are the options and their defaults.

var ftpServer = new FTPServer({
  host: '127.0.0.1',
  port: 21,
  pasvStart: null,
  pasvEnd: null,
  timeout: 30000,
  disabledCommands: [],
  anonymous: false,
  logLevel: 10,
  greeting = null,
  override: {
    fs: null,
    authentication: null
  }
});

Options

host | String

IP address clients use to connect to the server.
This IP will be used for passive connections, so ensure it is your remote IP.

port | Integer

Port clients use to connect to the server.

pasvStart / pasvEnd | Integer

Sets the range for ports to use with a passive connection.
The server will have the client connect to the first available port within the range.

timeout | Integer

How long (in milliseconds) before a connection is closed if no commands are received.

disabledCommands | Array [String]

String array of client commands that are forbidden.
These commands will be replied to with code 502.
Example: disabledCommands: ['RMD', 'RNFR', 'RNTO']

anonymous | Boolean

If true, will not authenticate connections and will act as if all connections are authenticated.

logLevel | Integer

See Bunyan Levels.

greeting | String

If set, a greeting is sent to the connection when it first connects.
This can be a string or path to a file.

override | Object

Used to override various functions or classes.
See Override Section.

Features

Classes

File

The File class is used to signify a file or directory.

import fs from 'fs';
import {File} from 'FTPServer';

fs.stat(..., (stat) {
  let myFile = new File('/path/to/file/or/directory').fromStat(stat);
});

You can use the fromStat function to populate information on the file or directory from the fs stat function.

Override

authentication

You can override the default authentication function used by connections.

function myAuthFunction(username, password) {
  ...
}

new FTPServer({
  ...
  override: {
    authentication: myAuthFunction
  }
})

Your function must return a promise that resolves if sucessful, and rejects otherwise.

ACCT:
If your connections require an account (ACCT), resolve your function with 332.
(This is not implemented yet)

fs

You can override the default filesystem the server uses by creating a new filesystem class.
Doing so can allow you to interact directly with the data without any real file access.

class MyFileSystem {
  constructor() {
    // Current connection: this.connection
    // Bunyan logger: this.connection.bunyan
  }
  ...
}

...

new FTPServer({
  ...
  override: {
    fs: MyFileSystem
  }
});

When a connection is recieved it will call new on the overridden class. The current connection will be available with this.connection.

Functions

The following functions are to be implemented in your class and must return promises (check lib/ftp/file-system.js for examples):

list(dir) {}

Receives a path to a directory relative to the current directory.
If no argument, than the current directory is used.
Returns an array of File classes (see File Section)

write(filePath, append) {}

Receives the relative path to write a new file.
Returns the stream to write data to.

read(filePath) {}

Receives the relative path to a file to read it's contents.
Returns the stream to read data from.

get(path)  {}

Returns a File class to the path (either a file or directory).

chdir(dir) {}

Change the current directory (dir is relative).

mkdir(dir) {}

Create a directory relative to the current directory.

delete(filePath) {}

Delete a file or directory relative to the current directory.

rename(oldName, newName) {}

Rename a file or directory relative to the current directory.

Contribution

Feel free to submit issues or pull requests, any assistance is welcomed!

Resources

• FTP: File Transfer Protocol
• RFC 959
• RFC 3659