This allows the user to register a custom transformation callback
for a specific protobuf message, in cases where the transformation
is sufficiently complex for it to be cumbersome to formalise
the logic through protobuf options.
This interceptor is responsible for maintaining compatability with the
JSON API with the change to the protobuf messages. The messages are
changing from a single attribue field to a oneof to explicitly associate
subtype attribute messages with the resource message. The interceptor
transforms the request prior to the auditReqeust interceptor, and
transforms the response after the auditResponse interceptor. This allows
the audit interceptors to use all the necessary classification
information when creating the audit events.
Johan Brandhorst-Satzkorn
Timothy Messier