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despotway.rb
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despotway.rb
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require 'rubygems'
require 'nokogiri'
require 'json'
require 'socket'
require 'uri'
require 'open-uri'
### id2uri ## cargo-culted from lib/despotify.c
EncodeAlphabet = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ+/";
EncodeHash = {}
EncodeAlphabet.split('').each_with_index {|l,i| EncodeHash[l] = i}
def baseconvert(input, frombase, tobase)
padlen = 22
out = ' ' * padlen
padlen = padlen - 1
numbers = input.split('').map {|h| EncodeHash[h]}
len = numbers.size
loop do
divide = 0
newlen = 0
0.upto(len-1) do |i|
n = numbers[i]
divide = divide * frombase + n
if (divide > tobase) then
numbers[newlen] = divide / tobase
divide = divide % tobase
newlen = newlen + 1
elsif newlen > 0 then
numbers[newlen] = 0
newlen = newlen + 1
end
end
len = newlen
out[padlen] = EncodeAlphabet[divide]
padlen = padlen - 1
break if newlen == 0
end
# we might not have used up all 22 characters here
# remove any prefixed whitespace (spotted by andym)
return out.strip
end
def id2uri(input)
return baseconvert(input, 16, 62)
end
def uri2id(input)
return baseconvert(input, 62, 16)
end
### Despot ## our interface to despotify-gateway
class Despot
attr_accessor :username, :password, :host, :port
attr_accessor :track_cache, :outputdir, :metacache, :metafile
attr_accessor :socket, :playlists, :tracks
def initialize(username, password, host, port, outputdir)
@host = host
@port = port
@username = username
@password = password
@outputdir = outputdir
@metacache = {} # in-memory transient cache for now
@socket = TCPSocket.new(host, port)
@playlists = []
@tracks = {}
@track_cache = {}
end
def init_metacache
end
def album_metadata(aid)
if not @metacache[aid].nil? then
return @metacache[aid]
end
# not cached, we need to look it up from the web API
aid_uri = id2uri(aid)
$stderr.puts "W #{aid} #{aid_uri}"
uri = "http://ws.spotify.com/lookup/1/?uri=spotify:album:#{aid_uri}"
begin
xml_meta = open(uri).read
rescue
$stderr.puts "!! http://ws.spotify.com/lookup/1/?uri=spotify:album:#{aid_uri} #{aid}"
# return nil if we can't read from the API
return nil
end
$stderr.puts xml_meta
aid_meta = {}
aid_meta[:id] = Hash.new()
if not xml_meta.nil? then
xml_dom = Nokogiri::XML(xml_meta)
if xml_dom.nil? then
return nil
end
# I hate having to do this
xml_dom.remove_namespaces!
# collect all the album metadata bits here
xml_dom.search("/album/id").each do |idnode|
id_type = idnode['type']
aid_meta[:id][id_type] = idnode.inner_text.strip
end
else
return nil
end
@metacache[aid] = aid_meta
return aid_meta
end
def write_playlist(playlist)
begin
Dir.mkdir(@outputdir)
rescue
end
pluri = id2uri(playlist[:pid][0..31])
pl = Nokogiri::XML::Builder.new(:encoding => 'UTF-8') do |xml|
xml.playlist('version' => '1', 'xmlns' => 'http://xspf.org/ns/0/') {
xml.title playlist[:name].to_s
xml.creator "Spotify/#{username}" # spotify link?
xml.info "http://open.spotify.com/user/#{playlist[:user]}"
xml.location "http://open.spotify.com/user/#{playlist[:user]}/playlist/#{pluri}"
xml.identifier "http://open.spotify.com/user/#{playlist[:user]}/playlist/#{pluri}"
xml.meta Time.now.to_i, :rel => "http://frottage.org/xspf/created/epoch"
xml.meta "despotway.rb", :rel => "http://frottage.org/xspf/creator"
xml.trackList {
playlist[:tracks].each do |track|
# TODO refactor this out into a sanitising function
if track[:uri] =~ /^spotify/ then
track[:to_link] = track[:uri]
else
if track[:uri].nil? then # shouldn't happen because we protect against this in load_track
$stderr.puts "!! #{track.inspect} has no URI in output"
track[:uri] = "_daddy_"
end
track[:to_link] = "http://open.spotify.com/track/" + track[:uri]
end
xml.track {
xml.location track[:to_link]
xml.title track[:title].to_s
xml.creator track[:artist].to_s
xml.album track[:album].to_s
xml.duration track[:duration].to_s
# we don't always have an ISRC code
if not track[:isrc].nil? then
xml.identifier "isrc:" + track[:isrc]
end
# do we have any album metadata to add?
if not track[:album_meta].nil? then
# we always have a :id subhash by design tho' it may be empty
track[:album_meta][:id].keys.each do |id_type|
val = track[:album_meta][:id][id_type]
# anything in the [:id] hash gets added as that type of identifier
if not val.nil? then
xml.identifier "#{id_type}:#{val}"
end
end
end
# we don't always have a track number
if not track[:index].nil? then
xml.trackNum track[:index].to_s
end
# if we have :arid, this is a real Spotify track, add extra links for niceness
if not track[:arid].nil? then
xml.meta track[:arid], :rel => "http://frottage.org/xspf/spotify/artist-id"
xml.meta track[:aid], :rel => "http://frottage.org/xspf/spotify/album-id"
xml.meta track[:tid], :rel => "http://frottage.org/xspf/spotify/track-id"
l_artist = id2uri(track[:arid])
l_album = id2uri(track[:aid])
xml.meta "http://open.spotify.com/artist/#{l_artist}", :rel => "http://frottage.org/xspf/spotify/artist"
xml.meta "http://open.spotify.com/album/#{l_album}", :rel => "http://frottage.org/xspf/spotify/album"
end
}
end
}
}
end
safename = playlist[:name].gsub(/[^0-9a-zA-Z]/, "_")
f = File.open(@outputdir + "/nokogiri-#{@username}-#{playlist[:pid]}-#{safename}.xspf", 'w')
f.write(pl.to_xml)
f.close
end
def cmd(command, *params)
cl = [command, params].flatten.join(' ') + "\n"
$stderr.puts "> #{cl.inspect}"
@socket.send(cl, 0)
response = ""
x = nil
until x == "\n" do
x = @socket.recv(1)
response = response + x
end
$stderr.puts "< #{response.inspect}"
code, length, status, text = response.split(' ', 4)
if code.to_i != 200 then
# raise ArgumentError, text
return [dom, code, length, status, text, payload]
end
payload = nil
dom = nil
if length.to_i > 0 then
payload = @socket.read(length.to_i)
dom = Nokogiri::XML(payload)
if dom.nil? then
# raise ArgumentError, "XML does not parse"
end
end
return [dom, code, length, status, text, payload]
end
def login
r = self.cmd("login", @username, @password)
$stderr.puts r.inspect
end
def load_all_playlists
$stderr.puts("L /pl/all")
dom, junk = self.cmd("playlist", "0000000000000000000000000000000000")
playlist_ids = dom.at("//items").inner_text.strip.split(',').map{|pid| pid.strip}
self.load_playlists(playlist_ids)
end
def load_playlists(playlist_ids)
playlist_ids.each do |p|
$stderr.puts("L /pl/#{p[0..33]}")
pl = self.load_playlist(p[0..33])
if not pl.nil? then
self.write_playlist(pl)
end
end
end
def load_playlist(pid)
dom, junk = self.cmd("playlist", pid)
if dom.nil? then
raise ArgumentError, junk.inspect
end
user = dom.at("//user").inner_text.strip
# if user != @username then
# $stderr.puts "We don't handle subscribed playlists properly yet, sorry!"
# return nil
# end
name = dom.at("//name").inner_text.strip
# need the map/strip because occasional tids have a \n prefix
track_ids = dom.at("//items").inner_text.strip.split(",").map{|tid| tid.strip}
# fetch information about our tracks from the API (or not the API, depending)
tracks = track_ids.map {|tid| self.load_track(tid)}
$stderr.puts "+ playlist #{name}"
x = {:name => name, :pid => pid, :tracks => tracks, :user => user}
@playlists << x
return x
end
def load_track(tid)
if not @track_cache[tid].nil? then
return @track_cache[tid]
end
if tid =~ /^spotify:local/ then
# we can't look this track up remotely
s, l, artist, album, title, duration = tid.split(/:/).map{|i| URI.unescape(i.gsub(/\+/,' '))}
track = {:title => title, :artist => artist, :album => album, :tid => tid, :uri => tid, :duration => (1000*duration.to_i).to_s}
@track_cache[tid] = track
return track
end
if tid =~ /^spotify:track:(.*)/ then
$stderr.puts "TU #{tid}"
end
# trim to 32 hex characters
tid = tid[0..31]
dom, junk = self.cmd("browsetrack", tid)
track = {}
success = dom.at("//total-tracks").inner_text.to_i
if success > 0 then
title = dom.at("//track/title").inner_text.strip
artist = dom.at("//track/artist").inner_text.strip
artist_id = dom.at("//track/artist-id").inner_text.strip
album = dom.at("//track/album").inner_text.strip
album_id = dom.at("//track/album-id").inner_text.strip
index = dom.at("//track/track-number").inner_text.strip
duration = dom.at("//track/length").inner_text.strip
uri = id2uri(tid)
if uri.nil? then
$stderr.puts "!! #{tid} doesn't map to a URI somehow"
uri = "_whoops_#{tid}_"
end
almeta = self.album_metadata(album_id)
track = {:title => title, :artist => artist, :album => album, :tid => tid, :uri => uri, :index => index, :duration => duration, :aid => album_id, :album_meta => almeta, :arid => artist_id}
eid = dom.at("//track/external-ids/external-id")
if not eid.nil? and eid['type'] == 'isrc' then
track[:isrc] = eid['id']
end
$stderr.puts track.inspect
@track_cache[tid] = track
end
return track
end
end
# xspf blindly passes unescaped strings to eval in single quotes. Because ... yes. Why not.
class String
def sq
self.gsub(/'/, "\\\\'")
end
end
config = JSON.load(open(ENV['HOME'] + '/.spotify.rb'))
username = config['username']
password = config['password']
# # #
# outputdir = ENV['HOME'] + '/playlists.xspf'
outputdir = './playlists.xspf'
begin
Dir.mkdir(outputdir)
rescue
end
dsp = Despot.new(username, password, 'localhost', 9988, outputdir)
dsp.login()
if ARGV.size > 0 then # a list of playlist IDs
dsp.load_playlists(ARGV)
else
dsp.load_all_playlists()
end