oauth2 #96
Description
- https://stackoverflow.com/questions/39229186/gitlab-refresh-oauth-token
- http://www.ruanyifeng.com/blog/2014/05/oauth_2_0.html
- https://gitlab.com/help/api/oauth2.md
- https://github.com/doorkeeper-gem/doorkeeper/wiki/Customizing-Token-Expiration
- https://github.com/doorkeeper-gem/doorkeeper/wiki/Using-Resource-Owner-Password-Credentials-flow
- https://github.com/doorkeeper-gem/doorkeeper/wiki/Authorization-Code-Flow