This FTP server is a gateway between old-school FTP devices and modern cloud based file systems, using the afero 's Fs interface and acting as a reference implementation of the ftpserverlib

At the current stage, supported FS are:

• Local disk
• S3 through fclairamb/afero-s3
• SFTP through afero's sftpfs

Planned FS are:

• Dropbox
• Google Drive

These features are brought by ftpserverlib itself:

• Uploading and downloading files
• Directory listing (LIST + MLST)
• File and directory deletion and renaming
• TLS support (AUTH + PROT)
• File download/upload resume support (REST)
• Complete driver for all the above features
• Passive socket connections (EPSV and PASV commands)
• Active socket connections (PORT command)
• Small memory footprint
• Only relies on the standard library except for:
  • go-kit log for logging
  • afero for generic file systems handling
• Supported extensions:
  • AUTH - Control session protection
  • AUTH TLS - TLS session
  • PROT - Transfer protection
  • MDTM - File Modification Time
  • SIZE - Size of a file
  • REST - Restart of interrupted transfer
  • MLST - Simple file listing for machine processing
  • MLSD - Directory listing for machine processing

go get -u github.com/fclairamb/ftpserver

If you don't create a ftpserver.json file, it will be created for you.

Here is a sample config file:

{
  "version": 1,
  "accesses": [
    {
      "user": "test",
      "pass": "test",
      "fs": "os",
      "params": {
        "basePath": "/tmp"
      }
    },
    {
      "user": "s3",
      "pass": "s3",
      "fs": "s3",
      "params": {
        "endpoint": "https://s3.amazonaws.com",
        "region": "eu-west-1",
        "bucket": "my-bucket",
        "access_key_id": "AKIA....",
        "secret_access_key": "IDxd....",
        "disable_ssl": "false",
        "path_style": "false"
      }
    },
    {
      "user": "sftp",
      "pass": "sftp",
      "fs": "sftp",
      "params": {
        "username": "user",
        "password": "password",
        "hostname": "192.168.168.11:22"
      }
    }
  ],
  "passive_transfer_port_range": {
    "start": 2122,
    "end": 2130
  }
}

You can build the binary and use it directly:

# Get and install the server
go get github.com/fclairamb/ftpserver

ftpserver &

# Download some file
[ -f kitty.jpg ] || (curl -o kitty.jpg.tmp https://placekitten.com/2048/2048 && mv kitty.jpg.tmp kitty.jpg)

# Upload it to the server
curl -v -T kitty.jpg ftp:https://test:test@localhost:2121/

# Download it back
curl ftp:https://test:test@localhost:2121/kitty.jpg -o kitty2.jpg

# Compare it
diff kitty.jpg kitty2.jpg

There's also a containerized version of the server (15MB, based on alpine).

# Starting the sample FTP server
docker run --rm -d -p 2121-2130:2121-2130 fclairamb/ftpserver

# Download some file
[ -f kitty.jpg ] || (curl -o kitty.jpg.tmp https://placekitten.com/2048/2048 && mv kitty.jpg.tmp kitty.jpg)

# Upload it
curl -v -T kitty.jpg ftp:https://test:test@localhost:2121/

# Download it back
curl ftp:https://test:test@localhost:2121/kitty.jpg -o kitty2.jpg

# Compare it
diff kitty.jpg kitty2.jpg