redirect URI endpoint cannot be implemented as REST API because of authentication

[mscurtescu]

Describe the bug

A clear and concise description of what the bug is. Please be as descriptive as possible; issues lacking detail, or for any other reason than to report a bug, may be closed without action.

See:

• https://developer.wordpress.org/rest-api/using-the-rest-api/authentication/
• https://stackoverflow.com/questions/42381521/how-to-get-current-logged-in-user-using-wordpress-rest-api

To Reproduce

Steps to reproduce the behavior:

1. User linking is broken since current user session is not found.