Flutter FTP Connect

Flutter simple and robust dart FTP Connect Library to interact with FTP and SFTP Servers.

Key Features • Examples • Parameters • SFTP Support • License

Key Features

• Supports SFTP/FTP/FTPS/FTPES
• Upload files to the server
• Download files/directories from the server
• List directory contents
• Manage files (rename/delete) and directories (create/delete)
• Completely asynchronous functions

This library is originally based on dart_ftpclient, which has not been updated in years.

Example upload file

Example 1:

import 'dart:io';
import 'package:ftpconnect/ftpconnect.dart';

main() async{
    FTPConnect ftpConnect = FTPConnect('example.com',user:'user', pass:'pass');
    File fileToUpload = File('fileToUpload.txt');
    await ftpConnect.connect();
    bool res = await ftpConnect.uploadFile(fileToUpload);
    await ftpConnect.disconnect();
    print(res);
}

Example 2: step by step

import 'dart:io';
import 'package:ftpconnect/ftpconnect.dart';

main() async{
  FTPConnect ftpConnect = FTPConnect('example.com',user:'user', pass:'pass');
 try {
      File fileToUpload = File('fileToUpload.txt');
      await ftpConnect.connect();
      await ftpConnect.uploadFile(fileToUpload);
      await ftpConnect.disconnect();
    } catch (e) {
      //error
    }
}

Download file

Example 1:

import 'dart:io';
import 'package:ftpconnect/ftpconnect.dart';

main() async{
    FTPConnect ftpConnect = FTPConnect('example.com',user:'user', pass:'pass');
    String fileName = 'toDownload.txt';
    await ftpConnect.connect();
    bool res = await ftpConnect.downloadFile(fileName, File('myFileFromFTP.txt'));
    await ftpConnect.disconnect();
    print(res);
}

Example 2: step by step

import 'dart:io';
import 'package:ftpconnect/ftpconnect.dart';

main() async {
  FTPConnect ftpConnect = FTPConnect('example.com',user:'user', pass:'pass');
 try {
      String fileName = 'toDownload.txt';
      await ftpConnect.connect();
      await ftpConnect.downloadFile(fileName, File('myFileFromFTP.txt'));
      await ftpConnect.disconnect();
    } catch (e) {
      //error
    }
}

Other Features

Directory functions:

//Get directory content
ftpConnect.listDirectoryContent();

//Create directory
ftpConnect.makeDirectory('newDir');

//Change directory
ftpConnect.changeDirectory('moveHereDir');

//get current directory
ftpConnect.currentDirectory();

//Delete directory
ftpConnect.deleteDirectory('dirToDelete');

//Delete a non-empty directory (recursively)
ftpConnect.deleteNonEmptyDirectory('dirToDelete');

//check for directory existance
ftpConnect.checkFolderExistence('dirToCheck');

//create a directory if it does not exist
ftpConnect.createFolderIfNotExist('dirToCreate');

//Upload a local directory recursively to the server
ftpConnect.uploadDirectory(Directory('localDir'), 'remoteDir');

//Download a remote directory recursively
ftpConnect.downloadDirectory('remoteDir', Directory('localDir'));

File functions:

//rename file
ftpConnect.rename('test1.txt', 'test2.txt');

//file size
ftpConnect.sizeFile('test1.txt');

//file existence
ftpConnect.existFile('test1.txt');

//delete file
ftpConnect.deleteFile('test2.zip');

//upload in-memory bytes (no local file needed)
ftpConnect.uploadData(Uint8List.fromList([1, 2, 3]), 'remote.bin');

//download a remote file into memory as bytes
final Uint8List bytes = await ftpConnect.downloadToBytes('remote.bin');

Parameters

Common parameters (FTPConnect and SFTPConnect)

Property	Description
host	Hostname or IP Address
port	Port number (FTP defaults to 21, FTPS to 990, SFTP to 22)
user	Username (Defaults to anonymous)
pass	Password if not anonymous login
showLog	Enable Debug Logging (Defaults to false)
logger	Custom logger
timeout	Timeout in seconds to wait for responses (Defaults to 30)

FTP-only parameters (FTPConnect)

Property	Description
securityType	SecurityType.ftp / ftpes / ftps (Defaults to ftp)

SFTP-only parameters (SFTPConnect)

Property	Description
privateKey	PEM/OpenSSH private key content, used instead of pass
passphrase	Passphrase protecting privateKey (if any)
onVerifyHostKey	Optional host key verification handler

More details here.

SFTP support

SFTP is provided by the SFTPConnect class, powered by the pure-Dart dartssh2 package. Both FTPConnect and SFTPConnect implement the same FileTransferClient interface, so they share identical method names/signatures and you can swap one for the other by changing only the instantiated class.

ℹ️ dartssh2 is written in pure Dart, so SFTPConnect works on every platform supported by Dart/Flutter (except web, which has no raw TCP sockets).

import 'dart:io';
import 'package:ftpconnect/ftpconnect.dart';

main() async {
  SFTPConnect sftpConnect = SFTPConnect(
    'example.com',
    port: 22,
    user: 'user',
    pass: 'pass',
    showLog: true,
  );

  try {
    await sftpConnect.connect();

    // Upload a file
    File fileToUpload = File('fileToUpload.txt');
    await sftpConnect.uploadFile(fileToUpload);

    // List directory content
    List<FTPEntry> content = await sftpConnect.listDirectoryContent('.');
    print(content);

    // Download a file
    await sftpConnect.downloadFile('toDownload.txt', File('myFile.txt'));

    // Manage files/directories
    await sftpConnect.makeDirectory('newDir');
    await sftpConnect.rename('test1.txt', 'test2.txt');
    await sftpConnect.deleteFile('test2.txt');

    await sftpConnect.disconnect();
  } catch (e) {
    // error
  }
}

Authenticating with a private key instead of a password:

SFTPConnect sftpConnect = SFTPConnect(
  'example.com',
  user: 'user',
  privateKey: '''-----BEGIN RSA PRIVATE KEY-----
...
-----END RSA PRIVATE KEY-----''',
  passphrase: 'passphrase-for-key',
);

View more Examples

Support

If this plugin was useful to you, helped you to deliver your app, saved you a lot of time, or you just want to support the project, I would be very grateful if you buy me a cup of coffee.

License

MIT