Application oauth2 for Twitter using Ruby

simple-twitter.rb

require 'oauth'
require 'httpclient'
require 'json'

class SimpleTwitter
  def initialize(config)
    @config = config
    @http_client = HTTPClient.new
  end

  def encoded_token
    bearer_token_credentials = "#{@config[:key]}:#{@config[:secret]}"
    Base64.encode64(bearer_token_credentials).split(/\n/).join('')
  end

  def authorization_headers
    {
      'Authorization' => "Basic #{encoded_token}",
      'Content-Type' => 'application/x-www-form-urlencoded;charset=UTF-8'
    }
  end

  def get_user_timeline(username, max=10)
    access_token = get_bearer_token
    uri = URI.parse("https://api.twitter.com/1.1/statuses/user_timeline.json?count=#{max}&screen_name=#{username}")
    headers = {
      'User-Agent' => 'My Twitter App v1.0.23',
      'Authorization' => "Bearer #{access_token}",
      'Accept-Encoding' => 'gzip'
    }
    response = @http_client.get(uri, {}, headers)
    gz = Zlib::GzipReader.new(StringIO.new(response.body.to_s))
    return JSON.parse(gz.read)
  end

  def get_bearer_token
    uri = URI.parse('https://api.twitter.com/oauth2/token')
    response = @http_client.post(uri, { grant_type: 'client_credentials' }, authorization_headers)
    return JSON.parse(response.body)['access_token']
  end
end

twitter = SimpleTwitter.new({ key: ENV['CONSUMER_KEY'], secret: ENV['CONSUMER_SECRET'] })
results = twitter.get_user_timeline('coderberry')
puts results.inspect