The code sample below is for an application that uses the YouTube Data and YouTube Analytics APIs to retrieve YouTube channel metrics. The samples use the Google APIs Ruby client library to demonstrate API functionality.

#!/usr/bin/ruby

require 'rubygems'
require 'google/api_client'
# oauth/oauth_util is not part of the official Ruby client library. 
# Get it at http://samples.google-api-ruby-client.googlecode.com/git/oauth/oauth_util.rb
require 'oauth/oauth_util'
require 'trollop'


# This code assumes that there's a client_secrets.json file in your current directory,
# which contains OAuth 2.0 information for this application, including client_id and
# client_secret. You can acquire an ID/secret pair from the API Access tab on the
# Google APIs Console
#   <http://code.google.com/apis/console#access>
# For more information about using OAuth2 to access Google APIs, please visit:
#   <https://developers.google.com/accounts/docs/OAuth2>
# For more information about the client_secrets.json file format, please visit:
#   <https://developers.google.com/api-client-library/python/guide/aaa_client_secrets>
# Please ensure that you have enabled the YouTube Data & Analytics APIs for your project.

YOUTUBE_SCOPES = ['https://www.googleapis.com/auth/youtube.readonly',
  'https://www.googleapis.com/auth/yt-analytics.readonly']
YOUTUBE_API_SERVICE_NAME = 'youtube'
YOUTUBE_API_VERSION = 'v3'
YOUTUBE_ANALYTICS_API_SERVICE_NAME = 'youtubeAnalytics'
YOUTUBE_ANALYTICS_API_VERSION = 'v1'

now = Time.new.to_i
SECONDS_IN_DAY = 60 * 60 * 24
SECONDS_IN_WEEK = SECONDS_IN_DAY * 7
one_day_ago = Time.at(now - SECONDS_IN_DAY).strftime('%Y-%m-%d')
one_week_ago = Time.at(now - SECONDS_IN_WEEK).strftime('%Y-%m-%d')

opts = Trollop::options do
  opt :metrics, 'Report metrics', :type => String, :default => 'views,comments,favoritesAdded,favoritesRemoved,likes,dislikes,shares'
  opt :dimensions, 'Report dimensions', :type => String, :default => 'video'
  opt 'start-date', 'Start date, in YYYY-MM-DD format', :type => String, :default => one_week_ago
  opt 'end-date', 'Start date, in YYYY-MM-DD format', :type => String, :default => one_day_ago
  opt 'start-index', 'Start index', :type => :int, :default => 1
  opt 'max-results', 'Max results', :type => :int, :default => 10
  opt :sort, 'Sort order', :type => String, :default => '-views'
end

client = Google::APIClient.new
youtube = client.discovered_api(YOUTUBE_API_SERVICE_NAME, YOUTUBE_API_VERSION)
youtube_analytics = client.discovered_api(YOUTUBE_ANALYTICS_API_SERVICE_NAME,
  YOUTUBE_ANALYTICS_API_VERSION)

auth_util = CommandLineOAuthHelper.new(YOUTUBE_SCOPES)
client.authorization = auth_util.authorize()

channels_response = client.execute!(
  :api_method => youtube.channels.list,
  :parameters => {
    :mine => true,
    :part => 'id'
  }
)

channels_response.data.items.each do |channel|
  opts[:ids] = "channel==#{channel.id}"

  analytics_response = client.execute!(
    :api_method => youtube_analytics.reports.query,
    :parameters => opts
  )

  puts "Analytics Data for Channel #{channel.id}"

  analytics_response.data.columnHeaders.each do |column_header|
    printf '%-20s', column_header.name
  end
  puts

  analytics_response.data.rows.each do |row|
    row.each do |value|
      printf '%-20s', value
    end
    puts
  end
end

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