Elexis overlay for MITREid Connect

NOTE: This solution is not used anymore. Elexis-Environment (EE) uses Keycloak as integrated service.

This overlay creates a MITREid Connect web-application configured for usage with an Elexis database.

The webapp requires the file elexis-connection.xml to exist in the user home's elexis-server directory.

Overlay modifications

Use the Elexis-Database configured via elexis-connection.xml as user repository.
Use H2 as OpenID Database, and persist the database to ~/elexis-server/openid
Enable Resource Owner Credentials aka password flow
Programmatically initialize the OpenID database
- Insert the required systems scopes
- Add an introspection client for Elexis-Server
On startup with -Dopenid.unit-test=true add a unit-test client supporting password grant type
Read the mainContact to show in the web-interface from the Elexis database
Implement 2-factor-authentication using TOTP
Hardcode base tag in header.tag to /openid/
Dynamic issuer resolution according to hostname (can be manually overriden with the openid.issuer parameter)
Ready for >= Java 11 (include missing JAXB libraries)

Prevent totp brute-force attacks if password is known
Is the user allowed to request a specific scope? mitreid-connect/OpenID-Connect-Java-Spring-Server#351
Remove unit-test-client on shutdown

Run mvn package to generate the overlay openid.war