Prevent DoS attacks by rejecting unknown realms #594
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Now ready for review.
This PR fixes #541 by preventing unknown realms to proceed.
It's probably not the definitive way of declaring realms, but given that we don't have an API yet to manage realms, the best solution is to declare known realms upfront in the configuration.
This PR also introduces a
TestRealmContextResolverthat is basically the old realm context resolver, and which is used in tests only.