Enable atSign based log in to web based applications

[VJag]

Is your feature request related to a problem? Please describe.

Very similar to "Open ID / OAuth" atProtocol can enable "password-less login" and "identity exchange" with web-based applications.

The objective of this task is to accomplish the above.

Describe the solution you'd like

• Develop a java library that helps with @login functionality [Completed]
  The library will have two functionalities
  - Generate an authentication cookie
  - Verify if the authentication cookie is present

• Unit tests and code review

• Demonstrate usage of the Java library [Completed]

Updated list of tasks [Aug 7, 2023]

• Develop a database-backed rest service
• Update Readme's
• Use a cram-like string instead of UUID for the authentication token
• Use signature verification for the auth token while verifying
• Add qr_code which can be scanned to authenticate ?

[VJag]

@srieteja checked-in the Java library.

Pending tasks in this task are:

• Check-in nodes js demo app in an appropriate git repo
• Code review

[gkc]

Is this still being actively worked on?

[srieteja]

All the necessary code has been introduced into https://github.com/atsign-foundation/at_login/tree/master

[srieteja]

Reopening ticket with updated list of tasks

[srieteja]

Could not work on this in PR68, carrying it forward to PR69

[srieteja]

Could not work on this as we are getting APKAM to the finish line. Carrying this forward to PR71.

[srieteja]

Started working on it, will continue working on it in the next sprint. Carrying it forward to PR75.

[srieteja]

Most of the implementation has been completed, fixing minor issues with signature verification. Carrying forward to PR76 to complete the implementation, testing and review.