The purpose of this is to serve as a generic webhook authorizer for Apache NiFi in order to be able to secure NiFi with for example the Open Policy Agent or similar tools.
The jar file needs to be provided on the CLASSPATH of NiFi. The easiest way to achieve this is to copy it to the lib directory in the install folder (not recommended to do this, but the easiest way).
The authorizer can be configured in the authorizer.xml file of NiFis configuration directory.
<authorizer>
<identifier>webhook-authorizer</identifier>
<class>tech.stackable.nifi.WebhookAuthorizer</class>
<property name="Authorizaten Endpoint URL">http://localhost:8000</property>
</authorizer>
To make NiFi use this authorizer, it has to be referred to by name from the nifi.properties file:
nifi.security.user.authorizer=webhook-authorizer
Additionally an identity provider has to be configured, but this is outside the scope of this project.