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由 Timothy Andrew 提交于
- To hold registrations from U2F devices, and to authenticate them. - Previously, `User#two_factor_enabled` was aliased to the `otp_required_for_login` column on `users`. - This commit changes things a bit: - `User#two_factor_enabled` is not a method anymore - `User#two_factor_enabled?` checks both the `otp_required_for_login` column, as well as `U2fRegistration`s - Change all instances of `User#two_factor_enabled` to `User#two_factor_enabled?` - Add the `u2f` gem, and implement registration/authentication at the model level.
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