Adding functions to invalidate the various caches #142
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A time to live in the server caches for the data retrieved from Discovery and JWKS endpoints is defined (1day). This is good as it enables implementing some specific use cases such as key rotation.
However, it might be required to invalidate the caches immediately, in order an update of the OP to be taken into account immediately, for example.
This PR provide the functions (one internal, and one external) to enable a
lua-resty-openidc
client code to trigger the caches invalidation. Discovery and JWKS, caches are flushed, but also introspection as it is better to re-evaluate tokens as the jwks and discovery data may have changed.