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#!/usr/bin/env ruby
#
# Proxy server for Last.fm and DAAP. Relays the stream from the server to localhost, and
# converts the protocol to http on the fly.
#
# (c) 2006 Paul Cifarelli <paul@cifarelli.net>
# (c) 2006 Mark Kretschmann <markey@web.de>
# (c) 2006 Michael Fellinger <manveru@weez-int.com>
# (c) 2006 Ian Monroe <ian@monroe.nu>
# (c) 2006 Martin Ellis <martin.ellis@kdemail.net>
# (c) 2006 Alexandre Oliveira <aleprj@gmail.net>
# (c) 2006 Tom Kaitchuck <tkaitchuck@comcast.net>
#
# License: GNU General Public License V2
# Amarok listens to stderr and recognizes these magic strings, do not remove them:
# "AMAROK_PROXY: startup", "AMAROK_PROXY: SYNC"
require 'socket'
require "uri"
$stdout.sync = true
class Proxy
ENDL = "\r\n"
def initialize( port, remote_url, engine, proxy )
@engine = engine
myputs( "running with port: #{port} and url: #{remote_url} and engine: #{engine}" )
# Open the amarok-facing socket
# amarok: the server port on the localhost to which the engine will connect.
amarok = TCPServer.new( port )
myputs( "startup" )
# amaroks: server socket for above.
amaroks = amarok.accept
# uri: from amarok, identifies the source of the music
uri = URI.parse( remote_url )
myputs("host " << uri.host << " ")
myputs( port )
# Now we have the source of the music, determine the HTTP request that
# needs to be made to the remote server (or remote proxy). It will
# be of the form "GET ... HTTP/1.x". It will include the
# http://hostname/ part if, and only if, we're using a remote proxy.
get = get_request( uri, !proxy.nil? )
#Check for proxy
begin
proxy_uri = URI.parse( proxy )
serv = TCPSocket.new( proxy_uri.host, proxy_uri.port )
rescue
serv = TCPSocket.new( uri.host, uri.port )
end
serv.sync = true
myputs( "running with port: #{uri.port} and host: #{uri.host}" )
# Read the GET request from the engine
amaroks_get = amaroks.readline
myputs( amaroks_get.inspect )
myputs( get.inspect )
myputs( "#{amaroks_get} but sending #{get}" )
serv.puts( get )
# Copy the HTTP REQUEST headers from the amarok engine to the
# remote server, and signal end of headers.
myputs( "COPY from amarok -> serv" )
cp_to_empty_outward( amaroks, serv )
safe_write( serv, "\r\n\r\n" )
# Copy the HTTP RESPONSE headers from the server back to the
# amarok engine.
myputs( "COPY from serv -> amarok" )
cp_to_empty_inward( serv, amaroks )
if @engine == 'gst10-engine'
3.times do
myputs( "gst10-engine waiting for reconnect" )
sleep 1
break if amaroks.eof
end
amaroks = amarok.accept
safe_write( amaroks, "HTTP/1.0 200 OK\r\n\r\n" )
amaroks.each_line do |data|
myputs( data )
data.chomp!
break if data.empty?
end
end
# Now stream the music!
myputs( "Before cp_all()" )
cp_all_inward( serv, amaroks )
if @engine == 'helix-engine' && amaroks.eof
myputs( "EOF Detected, reconnecting" )
amaroks = amarok.accept
cp_all_inward( serv, amaroks )
end
end
def safe_write( output, data )
begin
output.write data
rescue
myputs( "error from output.write, #{$!}" )
myputs( $!.backtrace.inspect )
break
end
end
def cp_to_empty_outward( income, output )
myputs "cp_to_empty_outward( income => #{income.inspect}, output => #{output.inspect}"
income.each_line do |data|
if data =~ /User-Agent: xine\/([0-9.]+)/
version = $1.split(".").collect { |v| v.to_i }
myputs("Found xine user agent version #{version.join(".")}")
@xineworkaround = ( version[0] <= 1 && version[1] <= 1 && version[2] <= 2 )
end
myputs( data )
data.chomp!
safe_write( output, data )
myputs( "data sent.")
return if data.empty?
end
end
def desync (data)
if data.gsub!( "SYNC", "" )
myputs( "SYNC" )
end
end
def cp_to_empty_inward( income, output )
myputs( "cp_to_empty_inward( income => #{income.inspect}, output => #{output.inspect}" )
income.each_line do |data|
myputs( data )
safe_write( output, data )
return if data.chomp == ""
end
end
def cp_all_inward( income, output )
myputs( "cp_all( income => #{income.inspect}, output => #{output.inspect}" )
if self.is_a?( LastFM ) and @xineworkaround
myputs( "Using buffer fill workaround." )
filler = Array.new( 4096, 0 )
safe_write( output, filler ) # HACK: Fill xine's buffer so that xine_open() won't block
end
if @engine == 'helix-engine'
data = income.read( 1024 )
else
data = income.read( 4 )
end
desync( data )
holdover = ""
loop do
begin
safe_write( output, data )
rescue
myputs( "error from o.write, #{$!}" )
break
end
newdata = income.read( 1024 )
data = holdover + newdata[0..-5]
holdover = newdata[-4..-1]
desync( data )
break if newdata == nil
end
end
end
class LastFM < Proxy
# Last.fm protocol:
# Stream consists of pure MP3 files concatenated, with the string "SYNC" in between, which
# marks a track change. The proxy notifies Amarok on track change.
def get_request( remote_uri, via_proxy )
# remote_uri - the URI of the stream we want
# via_proxy - true iff we're going through another proxy
if via_proxy then
url = remote_uri.to_s
else
url = "#{remote_uri.path || '/'}?#{remote_uri.query}"
end
get = "GET #{url} HTTP/1.0" + ENDL
get += "Host: #{remote_uri.host}:#{remote_uri.port}" + ENDL + ENDL
end
end
class DaapProxy < Proxy
def initialize( port, remote_url, engine, hash, request_id, proxy )
@hash = hash
@requestId = request_id
super( port, remote_url, engine, proxy )
end
def get_request( remote_uri, via_proxy )
# via_proxy ignored for now
get = "GET #{remote_uri.path || '/'}?#{remote_uri.query} HTTP/1.0" + ENDL
get += "Accept: */*" + ENDL
get += "User-Agent: iTunes/4.6 (Windows; N)" + ENDL
get += "Client-DAAP-Version: 3.0" + ENDL
get += "Client-DAAP-Validation: #{@hash}" + ENDL
get += "Client-DAAP-Access-Index: 2" + ENDL
get += "Client-DAAP-Request-ID: #{@requestId}" + ENDL
get += "Host: #{remote_uri.host}:#{remote_uri.port}" + ENDL + ENDL
get
end
end
def myputs( string )
$stdout.puts( "AMAROK_PROXY: #{string}" )
end
begin
myputs( ARGV )
if( ARGV[0] == "--lastfm" ) then
option, port, remote_url, engine, proxy = ARGV
LastFM.new( port, remote_url, engine, proxy )
else
option, port, remote_url, engine, hash, request_id, proxy = ARGV
DaapProxy.new( port, remote_url, engine, hash, request_id, proxy )
end
rescue
myputs( $!.to_s )
myputs( $!.backtrace.inspect )
end
puts( "exiting" )
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