oauth2-server
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oauth2: 2 phase authentication
Support for 2 phase authentication will be required.
Resources:
- https://en.wikipedia.org/wiki/Multi-factor_authentication
- https://en.wikipedia.org/wiki/Time-based_One-time_Password_Algorithm
- https://tools.ietf.org/html/rfc6238
- https://github.com/wstrange/GoogleAuth