OAuth 2 による GitHub 連携認証用 URI の生成サンプル

check_oauth2.rb

require 'oauth2'

client_id = 'CLIENT_ID'
client_secret = 'CLIENT_SECRET'

oauth = OAuth2::Client.new(client_id,
                            client_secret,
                            {
                              site: 'https://api.github.com',
                              authorize_url: 'https://github.com/login/oauth/authorize',
                              token_url: 'https://github.com/login/oauth/access_token'
                            })

# 認証用 URI の生成
client = oauth.authorize_url(client_id: client_id, scope: 'user:email')

# 認証用 URI
p client
#=> "https://github.com/login/oauth/authorize?client_id=CLIENT_ID&scope=user%3Aemail"

# redirect to callback
# code length is 20 character
# callback URI is "https://setting.callback.url/?code=xxxxxxxxxxxxxxxxxxxx"
code = "https://setting.callback.url/?code=xxxxxxxxxxxxxxxxxxxx".sub('.*?code=', '')
token = oauth.get_code.get_token(code)

# GitHub access token 
p token.token
#=> "************************************xxxx"