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As described above, Kafka protocol for requests and responses to describe broker resources will be extended to request authorized operations and return the set of authorized operations if requested. Broker will use its pluggable Authorizer to obtain the set of permitted operations for the Session performing the Describe operation. SimpleAclAuthorizer will be updated to traverse through ACLs once and return all the matching operations. Custom authorizers may be extended to do the same, but a default implementation that uses the existing `authorize()` method to authorize every supported operation ensures that existing authorizers can be used without change(See this). If no authorizer is configured on the broker, the full set of supported operations on each resource will be returned.

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