this script extracts unencrypted FLACs from an Android device running Tidal.

tidal_download

#!/usr/bin/env ruby

require 'bundler/inline'

gemfile do
  ruby '>=2.5'
  source 'https://rubygems.org'
  gem 'rb-inotify'
  gem 'pry-byebug'
end

require 'time'
require 'fileutils'

# create logfile
## must be playing on any bluetooth device for this to work
logfile = "#{Dir.mktmpdir}/tidal.log"
pid = spawn("adb logcat -e currsong", out: logfile)
Process.detach(pid)

sleep 1

# setup watcher
notifier = INotify::Notifier.new
n = 0
notifier.watch(logfile, :modify) { |event|
  n += 1
  next unless n.even?

  string = `tail -n 1 #{logfile}`
  
  title  = string.match(/title="([^"]*)"/)[1]
  title_c = clean_name(title)

  artist  = string.match(/artist="([^"]*)"/)[1]
  artist_c = clean_name(artist)
  
  album = string.match(/album="([^"]*)"/)[1]
  album_c = clean_name(album)
  
  track = string.match(/trackPosition=(\d\/\d)/)[1]
  track_c = track.dup
  track_c.gsub!('/', '-')

  files = `adb shell "su -c 'ls --full-time /mnt/runtime/default/emulated/0/Android/data/com.aspiro.tidal/files/offline'"`

  ## unfortunately, ls output on android's busybox doesn't respect nanoseconds in sort order, so we have to sort ourselves
  output_array = files.split("\n").collect{|n|
    next if n.length < 100
    time_string = n.split.drop(5)[0..2].join(' ')
    # this will return [float_time, filename]
    [Time.parse(time_string).to_f, n.split[-1]]
  }.compact.sort

  # get name of newest file out of sorted array
  file = output_array[-1][-1]
  
  puts "get decrypted #{file}"

  `adb shell su -c 'cp /mnt/runtime/default/emulated/0/Android/data/com.aspiro.tidal/files/offline/#{file} /data/local/tmp/'`
  `adb shell su -c 'chmod 644 /data/local/tmp/#{file}'`

  download_dir = "tidal_download/#{album_c}"
  FileUtils.mkdir_p(download_dir) unless File.exists?(download_dir)
  # format = "#{track_c}-#{artist_c}-#{title_c}"
  format = "#{artist_c}-#{title_c}"

  Dir.chdir(download_dir) do
    system("adb", "pull", "/data/local/tmp/#{file}", "#{format}.flac")
    system("adb", "shell", "rm", "/data/local/tmp/#{file}")
    puts "wrote #{format}.flac"
    system( "metaflac", "--set-tag=TITLE=#{title}", "--set-tag=ARTIST=#{artist}", "--set-tag=ALBUM=#{album}", "#{format}.flac" )
    puts "wrote tags to #{format}.flac"
    puts "#####################################"
  end

  puts "\n\nplaying next file\n\n"
  spawn("adb", "shell", "media", "dispatch", "next")
}

def clean_name(string)
  dupe = string.dup
  dupe.gsub!(' / ', '_')
  dupe.gsub!('/', '_')
  dupe.gsub!(' ', '_')
  dupe
end

notifier.run