SSI-Streetcred: User Login (VC Only)

[FarrandTom]

Context: As users login to Opus they will make use of their Proof of Account Ownership verifiable credential (VC)- allowing them to demonstrate that it is in fact their account.

Opus will allow users to login solely with their wallet credentials, meaning that you do not need a username and password to get into the system everytime.

Issue: Currently there is no functionality to support verification of Proof of Account Ownership VCs.

Next steps: Familiarise yourself with Streetcred; this tutorial in particular illustrates the flow we expect user to undergo when signing up, and then attempting to log in to Opus: http://merged-demo.azurewebsites.net/

Implementation of the desired user flow:

1. User navigates to Opus.
2. A QR code is presented upon clicking login.
3. Scanned by the user, which triggers a verification. This verification checks the VC held in the user's wallet against the registered accounts held in Opus' database- this is currently a Postgre DB in the main server.
4. If the VC matches a registered username/email within the user database, they are logged in as that account.

Note: Create a dummy Opus organisation and a dummy credential definition to work with until this issue is solved.

For reference the starter code for the SSI branch is lifted from: https://github.com/streetcred-id/iiw-demo