Add site access options for increased viewing permission granularity

[maxine]

Problem Description

Currently, Library utilizes domains to control who can access the site. However, this prohibits access on a person-by-person basis and increases the amount of maintenance needed when different aliases of the same domain are often used (ex: [email protected] versus [email protected]).

Feature

To address these issues, Library should support:

• [ ] individual email address access via an environment variable and OAuth configuration
• [ ] the use of regex for domain matching

Additional Information

Library accesses a user's email domain via the user's passport session and checks it against the APPROVED_DOMAINS config var.