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[NP-2927] Add DAO decorator to warn about (or redirect) system context #4398
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KernelDeimos
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BACKGROUND
We have two nspecs for capabilityDAO:
capabilityDAOandlocalCapabilityDAO. capabilityDAO is served, while localCapabilityDAO is intended for use by the system.CapabilityAuthService, as well as a number of rules, are accessing
capabilityDAOwith a system context, which introduces an inconsistency - the possibility of a system context - that each DAO decorator in capabilityDAO has to deal with individually.THIS PR
PreventSystemDAO is a DAO decorator that prevents a system context from accessing a DAO. It can be configured with three modes of operation:
ABORT_REQUEST: the default behaviour; do not handle the request. May produce an alarm.REDIRECT_REQUEST: log a warning, but redirect system context requests to the appropriate DAO (likelocalCapabilityDAO)WARN_ONLY: just warn about system contexts; don't modify behaviour. This is a helpful first-step for finding the common cases.