* Added /device/token handler with associated business logic and storage tests.
Perform user code exchange, flag the device code as complete.
Moved device handler code into its own file for cleanliness. Cleanup
* Removed PKCE code
* Rate limiting for /device/token endpoint based on ietf standards
* Configurable Device expiry
Signed-off-by: justin-slowik <justin.slowik@thermofisher.com>
This patch adds etcd storage implementation. This should be useful in
environments where
- we dont want to depends on a separate, hard to maintain SQL cluster
- we dont want to incur the overhead of talking to kubernetes apiservers
- kubernetes is not available yet, or if kubernetes depends on dex
to perform authentication and the operator would like to remove any
circular dependency if possible.
