Class: Drum::AppleMusicService

Inherits:
Service show all
Extended by:
Limiter::Mixin
Includes:
Log
Defined in:
lib/drum/service/applemusic.rb

Overview

A service that uses the Apple Music API to query playlists.

Constant Summary collapse

BASE_URL = 
'https://api.music.apple.com/v1'
PLAYLISTS_CHUNK_SIZE = 
50
MAX_ALBUM_ARTWORK_WIDTH = 
512
MAX_ALBUM_ARTWORK_HEIGHT = 
512
MUSICKIT_P8_FILE_VAR = 
'MUSICKIT_KEY_P8_FILE_PATH'
MUSICKIT_KEY_VAR = 
'MUSICKIT_KEY_ID'
MUSICKIT_TEAM_ID_VAR = 
'MUSICKIT_TEAM_ID'

Instance Method Summary collapse

Methods included from Log

#log

Methods inherited from Service

#remove

Constructor Details

#initialize(cache_dir) ⇒ AppleMusicService

Initializes the Apple Music service.

Parameters:

  • cache_dir (String) —

    The path to the cache directory (shared by all services)



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# File 'lib/drum/service/applemusic.rb', line 43

def initialize(cache_dir)
  @cache_dir = cache_dir / self.name
  @cache_dir.mkdir unless @cache_dir.directory?

  @auth_tokens = PersistentHash.new(@cache_dir / 'auth-tokens.yaml')
  @authenticated = false
end

Instance Method Details

#all_am_library_playlist_tracks(am_playlist, offset: 0, total: nil) ⇒ Object 



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# File 'lib/drum/service/applemusic.rb', line 307

def all_am_library_playlist_tracks(am_playlist, offset: 0, total: nil)
  unless total != nil && offset >= total
    response = self.api_library_playlist_tracks(am_playlist['id'], offset: offset)
    am_tracks = response['data']
    unless am_tracks.empty?
      return am_tracks + self.all_am_library_playlist_tracks(am_playlist, offset: offset + PLAYLISTS_CHUNK_SIZE, total: response.dig('meta', 'total'))
    end
  end
  []
end

#all_am_library_playlists(offset: 0, total: nil) ⇒ Object

Download helpers



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# File 'lib/drum/service/applemusic.rb', line 296

def all_am_library_playlists(offset: 0, total: nil)
  unless total != nil && offset >= total
    response = self.api_library_playlists(offset: offset)
    am_playlists = response['data']
    unless am_playlists.empty?
      return am_playlists + self.all_am_library_playlists(offset: offset + PLAYLISTS_CHUNK_SIZE, total: response.dig('meta', 'total'))
    end
  end
  []
end

#api_add_library_playlist_tracks(am_library_id, am_track_catalog_ids) ⇒ Object 



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# File 'lib/drum/service/applemusic.rb', line 281

def api_add_library_playlist_tracks(am_library_id, am_track_catalog_ids)
  self.post_json("/me/library/playlists/#{am_library_id}/tracks", {
    'tracks' => {
      'data' => am_track_catalog_ids.map do |am_id|
        {
          'id' => am_id,
          'type' => 'songs'
        }
      end
    }
  })
end

#api_catalog_playlist(am_storefront, am_catalog_id) ⇒ Object 



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# File 'lib/drum/service/applemusic.rb', line 251

def api_catalog_playlist(am_storefront, am_catalog_id)
  self.get_json("/catalog/#{am_storefront}/playlists/#{am_catalog_id}")
end

#api_catalog_search(am_storefront, term, limit: 1, offset: 0, types: ['songs']) ⇒ Object 



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# File 'lib/drum/service/applemusic.rb', line 255

def api_catalog_search(am_storefront, term, limit: 1, offset: 0, types: ['songs'])
  encoded_term = URI.encode_www_form_component(term)
  encoded_types = types.join(',')
  self.get_json("/catalog/#{am_storefront}/search?term=#{encoded_term}&limit=#{limit}&offset=#{offset}&types=#{encoded_types}")
end

#api_create_library_playlist(name, description: nil, am_track_catalog_ids: []) ⇒ Object 



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# File 'lib/drum/service/applemusic.rb', line 261

def api_create_library_playlist(name, description: nil, am_track_catalog_ids: [])
  self.post_json("/me/library/playlists/", {
    'attributes' => {
      'name' => name,
      'description' => description
    }.compact,
    'relationships' => {
      'tracks' => {
        'data' => am_track_catalog_ids.map do |am_id|
          {
            'id' => am_id,
            'type' => 'songs'
          }
        end
      }
      # TODO: Support parents i.e. playlist folders?
    }
  })
end

#api_library_playlist_tracks(am_library_id, offset: 0) ⇒ Object 



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# File 'lib/drum/service/applemusic.rb', line 247

def api_library_playlist_tracks(am_library_id, offset: 0)
  self.get_json("/me/library/playlists/#{am_library_id}/tracks?limit=#{PLAYLISTS_CHUNK_SIZE}&offset=#{offset}")
end

#api_library_playlists(offset: 0) ⇒ Object 



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# File 'lib/drum/service/applemusic.rb', line 243

def api_library_playlists(offset: 0)
  self.get_json("/me/library/playlists?limit=#{PLAYLISTS_CHUNK_SIZE}&offset=#{offset}")
end

#authenticate ⇒ Object 



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# File 'lib/drum/service/applemusic.rb', line 191

def authenticate
  p8_file = ENV[MUSICKIT_P8_FILE_VAR]
  key_id = ENV[MUSICKIT_KEY_VAR]
  team_id = ENV[MUSICKIT_TEAM_ID_VAR]

  if p8_file.nil? || key_id.nil? || team_id.nil?
    raise "Please specify your MusicKit keys (#{MUSICKIT_P8_FILE_VAR}, #{MUSICKIT_KEY_VAR}, #{MUSICKIT_TEAM_ID_VAR}) in your env vars!"
  end

  token = self.authenticate_app(p8_file, key_id, team_id)
  user_token = self.authenticate_user(token)

  @token = token
  @user_token = user_token
end

#authenticate_app(p8_file, key_id, team_id) ⇒ Object

Authentication



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# File 'lib/drum/service/applemusic.rb', line 57

def authenticate_app(p8_file, key_id, team_id)
  existing = @auth_tokens[:app]

  unless existing.nil? || existing[:expires_at].nil? || existing[:expires_at] < DateTime.now
    log.info 'Skipping app authentication...'
    return existing[:token]
  end

  expiration_in_days = 180 # may not be greater than 180
  expiration_in_seconds = expiration_in_days * 86400

  # Source: https://github.com/mkoehnke/musickit-token-encoder/blob/master/musickit-token-encoder
  # Copyright (c) 2016 Mathias Koehnke (http://www.mathiaskoehnke.de)
  #
  # Permission is hereby granted, free of charge, to any person obtaining a copy
  # of this software and associated documentation files (the "Software"), to deal
  # in the Software without restriction, including without limitation the rights
  # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  # copies of the Software, and to permit persons to whom the Software is
  # furnished to do so, subject to the following conditions:
  #
  # The above copyright notice and this permission notice shall be included in
  # all copies or substantial portions of the Software.
  #
  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  # THE SOFTWARE.

  iat = Time.now.to_i
  exp = (Time.now + expiration_in_seconds).to_i 
  pem_file = `openssl pkcs8 -nocrypt -in #{p8_file}`
  private_key = OpenSSL::PKey::EC.new(pem_file) 
  payload = { iss: "#{team_id}", iat: iat, exp: exp }

  token = JWT.encode(payload, private_key, "ES256", { alg: "ES256", kid: "#{key_id}" })
  log.info "Generated MusicKit JWT token #{token}"

  @auth_tokens[:app] = {
    expires_at: DateTime.now + expiration_in_days,
    token: token
  }

  token
end

#authenticate_user(token) ⇒ Object 



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# File 'lib/drum/service/applemusic.rb', line 106

def authenticate_user(token)
  existing = @auth_tokens[:user]

  unless existing.nil? || existing[:expires_at].nil? || existing[:expires_at] < DateTime.now
    log.info 'Skipping user authentication...'
    return existing[:token]
  end

  # Generate a new access refresh token,
  # this might require user interaction. Since the
  # user has to authenticate through the browser
  # via Spotify's website, we use a small embedded
  # HTTP server as a 'callback'.

  port = 17997
  server = WEBrick::HTTPServer.new({
    Port: port,
    StartCallback: Proc.new do
      Launchy.open("http://localhost:#{port}/")
    end
  })
  user_token = nil

  server.mount_proc '/' do |req, res|
    res.content_type = 'text/html'
    res.body = [
      '<!DOCTYPE html>',
      '<html>',
      '  <head>',
      '    <script src="https://js-cdn.music.apple.com/musickit/v1/musickit.js"></script>',
      '    <script>',
      "      document.addEventListener('musickitloaded', () => {",
      '        MusicKit.configure({',
      "          developerToken: '#{token}',",
      "          app: { name: 'Drum', build: '#{VERSION}' }",
      '        });',
      '      });',
      "      window.addEventListener('load', () => {",
      "        document.getElementById('authbutton').addEventListener('click', () => {",
      '          MusicKit.getInstance()',
      '            .authorize()',
      "            .then(userToken => fetch('/callback', { method: 'POST', body: userToken }))",
      "            .then(response => { document.getElementById('status').innerText = 'Done!'; });",
      '        });',
      '      });',
      '    </script>',
      '  </head>',
      '  <body>',
      '    <div id="status"><button id="authbutton">Click me to authorize!</button></div>',
      '  </body>',
      '</html>'
    ].join("\n")
  end

  server.mount_proc '/callback' do |req, res|
    user_token = req.body
    unless user_token.nil? || user_token.empty?
      res.body = 'Successfully got user token!'
    else
      res.body = 'Did not get user token! :('
    end
    server.shutdown
  end

  log.info "Launching callback HTTP server on port #{port}, waiting for auth code..."
  server.start

  if user_token.nil?
    raise "Did not get a MusicKit user token."
  end
  log.info "Generated MusicKit user token #{user_token}"

  # Cache user token for half an hour (an arbitrary duration)
  expiration_in_seconds = 1800

  @auth_tokens[:user] = {
    expires_at: DateTime.now + (expiration_in_seconds / 86400.0),
    token: user_token
  }

  user_token
ensure
  server&.shutdown
end

#authorization_headers ⇒ Object

API wrapper



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# File 'lib/drum/service/applemusic.rb', line 209

def authorization_headers
  {
    'Authorization': "Bearer #{@token}",
    'Music-User-Token': @user_token
  }
end

#download(ref) ⇒ Object

Service



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# File 'lib/drum/service/applemusic.rb', line 565

def download(ref)
  self.authenticate

  case ref.resource_type
  when :special
    case ref.resource_location
    when :playlists
      log.info 'Querying library playlists...'
      am_playlists = self.all_am_library_playlists.filter { |p| !p.dig('attributes', 'name').nil? }

      log.info 'Fetching playlists...'
      Enumerator.new(am_playlists.length) do |enum|
        am_playlists.each do |am_playlist|
          new_playlist = self.from_am_library_playlist(am_playlist)
          enum.yield new_playlist
        end
      end
    else raise "Special resource location '#{ref.resource_location}' cannot be downloaded (yet)"
    end
  when :playlist
    am_storefront, am_id = ref.resource_location

    log.info 'Querying catalog playlist...'
    response = self.api_catalog_playlist(am_storefront, am_id)
    am_playlists = response['data']

    log.info 'Fetching playlists...'
    Enumerator.new(am_playlists.length) do |enum|
      am_playlists.each do |am_playlist|
        new_playlist = self.from_am_catalog_playlist(am_playlist)
        enum.yield new_playlist
      end
    end
  else raise "Resource type '#{ref.resource_type}' cannot be downloaded (yet)"
  end
end

#from_am_album_artwork(am_artwork) ⇒ Object 



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# File 'lib/drum/service/applemusic.rb', line 322

def from_am_album_artwork(am_artwork)
  width = [am_artwork['width'], MAX_ALBUM_ARTWORK_WIDTH].compact.min
  height = [am_artwork['height'], MAX_ALBUM_ARTWORK_HEIGHT].compact.min
  am_artwork['url']
    &.sub('{w}', width.to_s)
    &.sub('{h}', height.to_s)
end

#from_am_artist_name(artist_name) ⇒ Object 



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# File 'lib/drum/service/applemusic.rb', line 330

def from_am_artist_name(artist_name)
  artist_names = artist_name.split(/\s*[,&]\s*/)
  artist_names.map do |artist_name|
    Artist.new(
      id: self.from_am_id(artist_name),
      name: artist_name
    )
  end
end

#from_am_catalog_playlist(am_playlist) ⇒ Object 



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# File 'lib/drum/service/applemusic.rb', line 451

def from_am_catalog_playlist(am_playlist)
  am_attributes = am_playlist['attributes']
  am_global_id = am_attributes.dig('playParams', 'id')
  new_playlist = Playlist.new(
    id: self.from_am_id(am_global_id),
    name: am_attributes['name'],
    description: am_attributes.dig('description', 'standard')
  )

  author_name = am_attributes['curatorName']
  new_author = User.new(
    id: self.from_am_id(author_name),
    display_name: author_name
  )
  new_playlist.author_id = new_author.id
  new_playlist.store_user(new_author)

  # TODO: Investigate whether this track list is complete,
  #       perhaps we need a mechanism similar to `all_am_library_playlist_tracks`.

  am_tracks = am_playlist.dig('relationships', 'tracks', 'data') || []
  am_tracks.each do |am_track|
    new_track, new_artists, new_album = self.from_am_catalog_track(am_track, new_playlist)

    new_playlist.store_track(new_track)
    new_playlist.store_album(new_album)

    new_artists.each do |new_artist|
      new_playlist.store_artist(new_artist)
    end
  end

  new_playlist
end

#from_am_catalog_track(am_track, new_playlist) ⇒ Object 



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# File 'lib/drum/service/applemusic.rb', line 399

def from_am_catalog_track(am_track, new_playlist)
  am_attributes = am_track['attributes']
  new_track, new_artists, new_album = self.from_am_track(am_track, new_playlist)

  new_track.applemusic = TrackAppleMusic.new(
    catalog_id: am_attributes.dig('playParams', 'id'),
    preview_url: am_attributes.dig('previews', 0, 'url')
  )

  [new_track, new_artists, new_album]
end

#from_am_id(am_id) ⇒ Object 



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# File 'lib/drum/service/applemusic.rb', line 318

def from_am_id(am_id)
  am_id.try { |i| Digest::SHA1.hexdigest(i) }
end

#from_am_library_playlist(am_playlist) ⇒ Object 



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# File 'lib/drum/service/applemusic.rb', line 411

def from_am_library_playlist(am_playlist)
  am_attributes = am_playlist['attributes']
  am_library_id = am_attributes.dig('playParams', 'id')
  am_global_id = am_attributes.dig('playParams', 'globalId')
  new_playlist = Playlist.new(
    id: self.from_am_id(am_global_id || am_library_id),
    name: am_attributes['name'] || '',
    description: am_attributes.dig('description', 'standard'),
    applemusic: PlaylistAppleMusic.new(
      library_id: am_library_id,
      global_id: am_global_id,
      public: am_attributes['isPublic'],
      editable: am_attributes['canEdit'],
      image_url: am_attributes.dig('artwork', 'url')
    )
  )

  # TODO: Author information

  begin
    am_tracks = self.all_am_library_playlist_tracks(am_playlist)
    log.info "Got #{am_tracks.length} playlist track(s) for '#{new_playlist.name}'..."
    am_tracks.each do |am_track|
      new_track, new_artists, new_album = self.from_am_library_track(am_track, new_playlist)

      new_playlist.store_track(new_track)
      new_playlist.store_album(new_album)

      new_artists.each do |new_artist|
        new_playlist.store_artist(new_artist)
      end
    end
  rescue RestClient::NotFound
    # Swallow 404s, apparently sometimes there are no tracks associated with a list
    nil
  end

  new_playlist
end

#from_am_library_track(am_track, new_playlist) ⇒ Object 



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# File 'lib/drum/service/applemusic.rb', line 387

def from_am_library_track(am_track, new_playlist)
  am_attributes = am_track['attributes']
  new_track, new_artists, new_album = self.from_am_track(am_track, new_playlist)

  new_track.applemusic = TrackAppleMusic.new(
    library_id: am_attributes.dig('playParams', 'id'),
    catalog_id: am_attributes.dig('playParams', 'catalogId')
  )

  [new_track, new_artists, new_album]
end

#from_am_track(am_track, new_playlist) ⇒ Object 



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# File 'lib/drum/service/applemusic.rb', line 340

def from_am_track(am_track, new_playlist)
  am_attributes = am_track['attributes']

  # TODO: Generate the album/artist IDs from something other than the names

  new_track = Track.new(
    name: am_attributes['name'],
    genres: am_attributes['genreNames'],
    duration_ms: am_attributes['durationInMillis'],
    isrc: am_attributes['isrc'],
    released_at: am_attributes['releaseDate'].try { |d| DateTime.parse(d) }
  )

  album_name = am_attributes['albumName']
  artist_name = am_attributes['artistName']
  composer_name = am_attributes['composerName']
  am_album_artwork = am_attributes['artwork'] || {}

  new_artists = []
  new_albums = []

  unless album_name.nil?
    new_album = Album.new(
      id: self.from_am_id(album_name),
      name: album_name,
      applemusic: AlbumAppleMusic.new(
        image_url: self.from_am_album_artwork(am_album_artwork)
      )
    )
    new_track.album_id = new_album.id
    new_albums << new_album
  end

  unless artist_name.nil?
    new_artists = self.from_am_artist_name(artist_name)
    new_track.artist_ids = new_artists.map { |a| a.id }
  end

  unless composer_name.nil?
    new_composers = self.from_am_artist_name(composer_name)
    new_track.composer_ids = new_composers.map { |c| c.id }
    new_artists += new_composers
  end

  [new_track, new_artists, new_album]
end

#get_json(endpoint) ⇒ Object 



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# File 'lib/drum/service/applemusic.rb', line 216

def get_json(endpoint)
  log.debug "-> GET #{endpoint}"
  response = RestClient.get(
    "#{BASE_URL}#{endpoint}",
    self.authorization_headers
  )
  unless response.code >= 200 && response.code < 300
    raise "Something went wrong while GETting #{endpoint}: #{response}"
  end
  JSON.parse(response.body)
end

#name ⇒ Object 



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# File 'lib/drum/service/applemusic.rb', line 51

def name
  'applemusic'
end

#parse_applemusic_link(raw) ⇒ Object 



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# File 'lib/drum/service/applemusic.rb', line 527

def parse_applemusic_link(raw)
  # Parses links like https://music.apple.com/us/playlist/some-name/pl.123456789

  # TODO: Investigate whether such links can always be fetched through the catalog API
  # TODO: Handle library links

  uri = URI(raw)
  unless ['http', 'https'].include?(uri&.scheme) && uri&.host == 'music.apple.com'
    return nil
  end

  parsed_path = uri.path.split('/')
  unless parsed_path.length == 5
    return nil
  end

  am_storefront = parsed_path[1]
  resource_type = self.parse_resource_type(parsed_path[2])
  am_id = parsed_path[4]

  Ref.new(self.name, resource_type, [am_storefront, am_id])
end

#parse_ref(raw_ref) ⇒ Object 



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# File 'lib/drum/service/applemusic.rb', line 550

def parse_ref(raw_ref)
  if raw_ref.is_token
    location = case raw_ref.text
    when "#{self.name}/tracks" then :tracks
    when "#{self.name}/playlists" then :playlists
    else return nil
    end
    Ref.new(self.name, :special, location)
  else
    self.parse_applemusic_link(raw_ref.text)
  end
end

#parse_resource_type(raw) ⇒ Object

Ref parsing



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# File 'lib/drum/service/applemusic.rb', line 518

def parse_resource_type(raw)
  case raw
  when 'playlist' then :playlist
  when 'album' then :album
  when 'artist' then :artist
  else nil
  end
end

#post_json(endpoint, json) ⇒ Object 



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# File 'lib/drum/service/applemusic.rb', line 228

def post_json(endpoint, json)
  log.debug "-> POST #{endpoint} with #{json}"
  response = RestClient.post(
    "#{BASE_URL}#{endpoint}",
    json.to_json,
    self.authorization_headers.merge({
      'Content-Type': 'application/json'
    })
  )
  unless response.code >= 200 && response.code < 300
    raise "Something went wrong while POSTing to #{endpoint}: #{response}"
  end
  JSON.parse(response.body)
end

#to_am_catalog_track_id(track, playlist) ⇒ Object

Upload helpers



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# File 'lib/drum/service/applemusic.rb', line 488

def to_am_catalog_track_id(track, playlist)
  am_id = track.applemusic&.catalog_id
  unless am_id.nil?
    # We already have an associated catalog ID
    am_id
  else
    # We need to search for the song
    search_phrase = playlist.track_search_phrase(track)
    am_storefront = 'de' # TODO: Make this configurable/dynamic
    response = self.api_catalog_search(am_storefront, search_phrase, limit: 1, offset: 0, types: ['songs'])
    response.dig('results', 'songs', 'data', 0).try do |am_track|
      am_attributes = am_track['attributes']
      log.info "Matched '#{track.name}' with '#{am_attributes['name']}' by '#{am_attributes['artistName']}' from Apple Music"
      am_track['id']
    end
  end
end

#upload(ref, playlists) ⇒ Object 



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# File 'lib/drum/service/applemusic.rb', line 602

def upload(ref, playlists)
  self.authenticate

  # Note that pushes currently intentionally always create a new playlist
  # TODO: Flag for overwriting (something like -f, --force?)
  #       (the flag should be declared in the CLI and perhaps added
  #       to Service.upload as a parameter)

  unless ref.resource_type == :special && ref.resource_location == :playlists
    raise 'Cannot upload to anything other than @applemusic/playlists yet!'
  end

  playlists.each do |playlist|
    self.upload_playlist(playlist)
  end
end

#upload_playlist(playlist) ⇒ Object 



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# File 'lib/drum/service/applemusic.rb', line 506

def upload_playlist(playlist)
  # TODO: Chunking?

  self.api_create_library_playlist(
    playlist.name,
    description: playlist.description,
    am_track_catalog_ids: playlist.tracks.filter_map { |t| self.to_am_catalog_track_id(t, playlist) }
  )
end