gistfile1.rb

1, 获取 access token

get '/auth/douban/callback' do
  auth = env['omniauth.auth']
  credentials = auth['credentials'] 
end

在这里可以拿到 credentials, 大致格式：

{"token"=>"xxxxxxxxxxxxxxxxx", "expires_at"=>1345640145, "expires"=>true}

token = credentials['token']


2, 使用 gem oauth2 

require 'oauth2'

KEY = 'your key'
SECRET = 'your secret'

token = 'xxxxxx' # 第1步中获取的 token

client = OAuth2::Client.new(KEY, SECRET, { site: 'https://api.douban.com',
                                           authorize_url: 'https://www.douban.com/service/auth2/auth',
                                           token_url: 'https://www.douban.com/service/auth2/token'})

access_token = OAuth2::AccessToken.new(client, token)


3, 然后就可以拿 access_token 进行操作了

puts access_token.get('/v2/people/~me').parsed 
puts access_token.get('/doumail/inbox').parsed