Blather XMPP bot that receives file transfers that are sent using XEP 0096. Not at all complete, but wanted to post something that demonstrates working file transfer, since I couldn't find any.

filesink.rb

require 'rubygems'
require 'blather/client'
require 'awesome_print'
require 'nokogiri'
require 'pretty-xml'
require 'nokogiri-pretty'
include PrettyXML

# This is a Blather bot that receives file transfers that are sent using
# XEP 0096, using either p2p SOCKS5 (XEP 0065), or through the server
# using in-band bytestreams (XEP 0047).

# Does not work at all with servers that implement XEP 0198!
# Servers that require 0198 are incompatible with clients that don't implement
# Run with -D, and look for:
#       xmlns:ack="http://www.xmpp.org/extensions/xep-0198.html#ns"

# So far, only tested with a client that had a proxy65 on its side.

setup 'filesink@xmpp.example.com', 'MyGreatPassword'

when_ready do
  set_caps(
    "http://dreness.com/filesink",
    [{:type => "bot", :category => "client", :name => "csbot"}],
    [
    # In-band bytestreams: http://xmpp.org/extensions/xep-0047.html
    "http://jabber.org/protocol/ibb", 

    # SOCKS5 Bytestreams: http://xmpp.org/extensions/xep-0065.html
    "http://jabber.org/protocol/bytestreams",

    # SI File Transfer: http://xmpp.org/extensions/xep-0096.html
    "http://jabber.org/protocol/si", 

    # Namespace of stream initiation profile (specified in 0096)
    "http://jabber.org/protocol/si/profile/file-transfer",
    ]
  )
  puts "Connected to #{client.jid}. Sent capabilities:"
  send_caps
  ap client.caps, :plain => true
  puts
  set_status(state = nil, msg = 'I dream of electric sheep')
end

# Auto approve subscription requests
subscription :request? do |s|
  write_to_stream s.approve!
end

# Echo back what was said
message :chat?, :body do |m|
  write_to_stream m.reply
end

# Accept SI file transfers
client.register_handler :file_transfer do |iq| 
    transfer = Blather::FileTransfer.new(client, iq)
    transfer.accept(
      Blather::FileTransfer::SimpleFileReceiver,
      "/home/filesink/f/#{iq.si.file["name"]}",  # destination path
      iq.si.file["size"].to_i,
    ) 
    puts "Receiving file from #{iq.from}"
    puts iq.si.file.to_xml
    puts
end