yii2-OAuth-2.0 yii2-OAuth 2.0 infomations guide links: http://tutorials.jenkov.com/oauth2/index.html, https://github.com/filsh/yii2-oauth2-server, https://github.com/hosannahighertech/yii2-oauth2-server, http://www.shuijingwanwq.com/2015/08/26/649/