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我正在尝试从我的 Rails 应用程序访问 Google API。我了解用于 Web 应用程序的 OAuth2.0 的基本流程。而且我认为自己对 Ruby 和 Rails 有基本的了解。

然而，我无法理解 Google 在“ API Client Library for Ruby (Alpha) ”指南中展示的示例。

require 'google/apis/calendar_v3'
require 'google/api_client/client_secrets'
require 'sinatra'
require 'logger'

enable :sessions

def logger; settings.logger end

def calendar; settings.calendar; end

def user_credentials
# Build a per-request oauth credential based on token stored in session
# which allows us to use a shared API client.
  @authorization ||= (
    auth = settings.authorization.dup
    auth.redirect_uri = to('/oauth2callback')
    auth.update_token!(session)
    auth
  )
end

configure do
  log_file = File.open('calendar.log', 'a+')
  log_file.sync = true
  logger = Logger.new(log_file)
  logger.level = Logger::DEBUG

  Google::Apis::ClientOptions.default.application_name = 'Ruby Calendar sample'
  Google::Apis::ClientOptions.default.application_version = '1.0.0'
  calendar_api = Google::Apis::CalendarV3::CalendarService.new

  client_secrets = Google::APIClient::ClientSecrets.load
  authorization = client_secrets.to_authorization
  authorization.scope = 'https://www.googleapis.com/auth/calendar'

  set :authorization, authorization
  set :logger, logger
  set :calendar, calendar_api
end

before do
 # Ensure user has authorized the app
  unless user_credentials.access_token || request.path_info =~ /^\/oauth2/
    redirect to('/oauth2authorize')
  end
end

after do
# Serialize the access/refresh token to the session and credential store.
  session[:access_token] = user_credentials.access_token
  session[:refresh_token] = user_credentials.refresh_token
  session[:expires_in] = user_credentials.expires_in
  session[:issued_at] = user_credentials.issued_at
end

get '/oauth2authorize' do
# Request authorization
  redirect user_credentials.authorization_uri.to_s, 303
end

get '/oauth2callback' do
  # Exchange token
  user_credentials.code = params[:code] if params[:code]
  user_credentials.fetch_access_token!
  redirect to('/')
end

get '/' do
  # Fetch list of events on the user's default calandar
  events = calendar.list_events('primary', options: { authorization: user_credentials })
  [200, {'Content-Type' => 'application/json'}, events.to_h.to_json]
end

当然，这看起来像 Ruby，但我从未见过这里使用的一些结构，而且我不确定这些代码会放在 Rails 应用程序的哪个位置。

是鲁比吗？如果是这样，我该如何使用它？

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