create and add files to a youtube playlist

kicking-television.rb

require 'google/apis/youtube_v3'
require 'googleauth'
require 'googleauth/stores/file_token_store'
require 'fileutils'

def valid_youtube_id?(id)
  id =~ /^[a-zA-Z0-9_-]{11}$/
end

def authorize
  FileUtils.mkdir_p(File.dirname(CREDENTIALS_PATH))

  client_id = Google::Auth::ClientId.from_file(CLIENT_SECRETS_PATH)
  token_store = Google::Auth::Stores::FileTokenStore.new(file: CREDENTIALS_PATH)
  authorizer = Google::Auth::UserAuthorizer.new(
    client_id, SCOPES, token_store)
  user_id = 'default'
  credentials = authorizer.get_credentials(user_id)
  if credentials.nil?
    url = authorizer.get_authorization_url(base_url: REDIRECT_URI)
    puts "Open the following URL in the browser and enter the " +
         "resulting code after authorization"
    puts url
    code = gets
    credentials = authorizer.get_and_store_credentials_from_code(
      user_id: user_id, code: code, base_url: REDIRECT_URI)
  end
  credentials
end

# Path to client secret file downloaded from the Google Cloud Console
CLIENT_SECRETS_PATH = 'client_secret.json'

# Authorization scopes required by the YouTube API
SCOPES = [Google::Apis::YoutubeV3::AUTH_YOUTUBE_READONLY, Google::Apis::YoutubeV3::AUTH_YOUTUBE_FORCE_SSL, Google::Apis::YoutubeV3::AUTH_YOUTUBE]

# Path to file containing authorization credentials
CREDENTIALS_PATH = File.join(Dir.home, '.credentials', 'youtube-ruby-snippet-store.yaml')

REDIRECT_URI = 'http://localhost'
APPLICATION_NAME = 'Kicking Television'

youtube = Google::Apis::YoutubeV3::YouTubeService.new
youtube.client_options.application_name = APPLICATION_NAME
youtube.authorization = authorize

PLAYLIST_ID = ''

video_ids = ARGV.reject { |id| !valid_youtube_id?(id) }

if video_ids.empty?
  puts "No valid video IDs specified"
  exit
end

max_results = 50
playlist_items = youtube.list_playlist_items('snippet', playlist_id: PLAYLIST_ID, max_results: max_results)
while playlist_items.next_page_token do
  next_page_items = youtube.list_playlist_items('snippet', playlist_id: PLAYLIST_ID, max_results: max_results, page_token: playlist_items.next_page_token)
  playlist_items.items.concat(next_page_items.items)
end

existing_video_ids = playlist_items.items.map { |item| item.snippet.resource_id.video_id }

video_ids.each do |video_id|
  next if existing_video_ids.include?(video_id)
  
  playlist_item = Google::Apis::YoutubeV3::PlaylistItem.new(
    snippet: {
      playlist_id: PLAYLIST_ID,
      resource_id: {
        kind: 'youtube#video',
        video_id: video_id
      }
    }
  )
  youtube.insert_playlist_item('snippet', playlist_item)
end