Module: Exportify::Auth

Defined in:
lib/exportify/auth.rb

Constant Summary collapse

TOKEN_FILE = 
File.expand_path('~/.exportify_token.json')
REDIRECT_URI = 
'http://127.0.0.1:8888/callback'
SCOPES = 
'playlist-read-private playlist-read-collaborative'

Class Method Summary collapse

Class Method Details

.access_token ⇒ Object 



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# File 'lib/exportify/auth.rb', line 107

def access_token
  token = load_token
  if token.nil?
    token = authorize!
  elsif Time.now.to_i >= token['expires_at'].to_i - 60
    token = refresh_token(token)
  end
  token['access_token']
end

.authorize! ⇒ Object 



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# File 'lib/exportify/auth.rb', line 75

def authorize!
  params = URI.encode_www_form(
    client_id: client_id,
    response_type: 'code',
    redirect_uri: REDIRECT_URI,
    scope: SCOPES
  )
  url = "https://accounts.spotify.com/authorize?#{params}"

  puts "\nAbrindo navegador para login no Spotify..."
  puts "Se não abrir automaticamente, acesse:\n#{url}\n"
  system("open '#{url}'")

  code   = nil
  server = WEBrick::HTTPServer.new(
    Port: 8888,
    BindAddress: '127.0.0.1',
    Logger: WEBrick::Log.new(File::NULL),
    AccessLog: []
  )
  server.mount_proc('/callback') do |req, res|
    code          = req.query['code']
    res.body      = '<html><body><h2>Login realizado! Pode fechar esta aba.</h2></body></html>'
    res['Content-Type'] = 'text/html'
    server.shutdown
  end
  server.start

  abort 'Login cancelado' unless code
  exchange_code(code)
end

.client_id ⇒ Object 



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# File 'lib/exportify/auth.rb', line 117

def client_id
  ENV.fetch('SPOTIFY_CLIENT_ID', nil) || Config.load['spotify_client_id']
end

.client_secret ⇒ Object 



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# File 'lib/exportify/auth.rb', line 121

def client_secret
  ENV.fetch('SPOTIFY_CLIENT_SECRET', nil) || Config.load['spotify_client_secret']
end

.exchange_code(code) ⇒ Object 



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# File 'lib/exportify/auth.rb', line 46

def exchange_code(code)
  uri = URI('https://accounts.spotify.com/api/token')
  req = Net::HTTP::Post.new(uri)
  req['Authorization'] = "Basic #{Base64.strict_encode64("#{client_id}:#{client_secret}")}"
  req.set_form_data(
    'grant_type' => 'authorization_code',
    'code' => code,
    'redirect_uri' => REDIRECT_URI
  )
  res  = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) { |h| h.request(req) }
  data = JSON.parse(res.body)
  handle_token_error!(data)
  save_token(data)
end

.handle_token_error!(data) ⇒ Object 



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# File 'lib/exportify/auth.rb', line 61

def handle_token_error!(data)
  return unless data['error']

  case data['error']
  when 'invalid_client'
    abort 'Erro de autenticação: SPOTIFY_CLIENT_ID ou SPOTIFY_CLIENT_SECRET inválidos.'
  when 'invalid_grant'
    FileUtils.rm_f(TOKEN_FILE)
    abort "Sessão expirada ou revogada. Arquivo de token removido.\nExecute o comando novamente para fazer login."
  else
    abort "Erro ao obter token Spotify: #{data['error']} — #{data['error_description']}"
  end
end

.load_token ⇒ Object 



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# File 'lib/exportify/auth.rb', line 25

def load_token
  return nil unless File.exist?(TOKEN_FILE)

  JSON.parse(File.read(TOKEN_FILE))
end

.refresh_token(token_data) ⇒ Object 



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# File 'lib/exportify/auth.rb', line 31

def refresh_token(token_data)
  uri = URI('https://accounts.spotify.com/api/token')
  req = Net::HTTP::Post.new(uri)
  req['Authorization'] = "Basic #{Base64.strict_encode64("#{client_id}:#{client_secret}")}"
  req.set_form_data(
    'grant_type' => 'refresh_token',
    'refresh_token' => token_data['refresh_token']
  )
  res  = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) { |h| h.request(req) }
  data = JSON.parse(res.body)
  handle_token_error!(data)
  data['refresh_token'] ||= token_data['refresh_token']
  save_token(data)
end

.save_token(data) ⇒ Object 



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# File 'lib/exportify/auth.rb', line 19

def save_token(data)
  data['expires_at'] = Time.now.to_i + data['expires_in'].to_i
  File.write(TOKEN_FILE, JSON.generate(data))
  data
end