multi platform, one binary, automated file transfer util by Golang.
doukie is meaned japanese word is "sync", and green day's album "dookie" anagramed.

AirDrop is very useful file transfer method.
But, It's not what I'd expect opened economy method.
on not supported computers, is require support by official or OSS comunity effort.

We know universal protocol, is HTTP.

I think to want implement easy file transfer method by HTTP.
and, I realize file transfer on multi platform (include Smart phone!).

• multi platform suppoted
• run by one binary file
• Android supported (it's not perfect)
• automated file transfer.
• file exists check (use md5 hash)

• normal mode call following.
  

1. client call server's api on static ip. call "http(s)://{server ip address}:{port}/{token}/list"
   note) static ip can be defined -dst option.
   

2. If client can get lists, downloading files on static ip.
   call "http(s)://{server ip address}:{port}/{token}/download/{filename}"
   

• but, auto sync mode is.

1. you set client and server AES encrypt key when tool running.
   note) -auto and -autoDst option.
   

2. server encrypt access details and send to multicast udp(to 224.0.0.1).
   

3. client get this packet, decrypt data. If client decrypt success, get access url, port, token.
   

4. then, normal mode starting.
   

I mean, You don't need to know the server's IP address!

• use static token authentication
  this mode, you set static token when tool running, and client side same token.
  client access to server by static token.
  in case of authentication success, client copy files from server.
  

• auto sync mode
  server send multicast udp packet periodically include authentication detail.
  when client receive this packet, decrypt packet, client start to access to server.
  I mean, You don't need to know the server's IP address!
  in case of authentication success, client copy files from server.
  

• QR code scan and access to server
  When start application, QR code scan displayed.
  server console display QR code and scan by Android.
  in case of authentication success, Android copy files from server.
  

This feature is not implemented.

If you want to put it under the path, you can use the following.

go get github.com/yasutakatou/doukie

If you want to create a binary and copy it yourself, use the following.

git clone https://github.com/yasutakatou/doukie
cd doukie
go build doukie.go

or download binary from release page.
save binary file, copy to entryed execute path directory.

delete that binary. del or rm command. (it's simple!)

• use static token authentication

when static token mode, you set static token when running.
this following token is "test".

doukie -token=test

note) If not set static token, tool create and use random 8 character.

next, client side, set server ip address and token.

doukie -token=test -dst=192.168.0.1

note) server's ip is must examine before running.

• auto sync mode
  

this mode only set token used encrypt and decrypt.

note ) If can decrypt udp packet from server, access server data.
this mode danger and recommend in home and trust network use only.

doukie -auto=test

next, set same token to client, too.

doukie -autoDst=test

• transfer by HTTPS.
  

doukie -https -cert=localhost.pem -key=localhost-key.pem -token=test

note) you have to prepare certs.

• change target directory.
  

doukie -dir=myDir -token=test -dst=192.168.0.1

• by default if some file exists client, but not exists server, that file delete on client.
  when enable -noDelete option, not delete.
  

doukie -noDelete -token=test -dst=192.168.0.1

See here for other options.

• QR code scan and access to server
  

look at andoukie(doukie client for Android).
what is andoukie? here.

server can connected many client.

If your team access one server, can transfer same file.

doukie can running more than one on diffrent port number.

Therefore, first process as a server, second process as a client, can file transfer relay.

doukie use http transfer, so can over ssh forwarding.

your remote server easy sync.

this options enable on only PC. Android not useful.

BSD-3-Clause License