Introduce require-oauth flag
When this flag is enabled, authorization middleware will be turned on.
When this flag is enabled, Derived which is generated based on the client
token will not be used.
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Wire Authorization middleware to http mux
This commit adds authorization middleware. Additionally, this commit
rejects the requests if the bearer token is absent in Authorization
header of the request.
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Add offline token validation for expiration and audience
Per Model Context Protocol specification, MCP Servers must check the
audience field of the token to ensure that they are generated specifically
for them.
This commits parses the JWT token and asserts that audience is correct
and token is not expired.
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Add online token verification via TokenReview request to API Server
This commit sends online token verification by sending request to
TokenReview endpoint of API Server with the token and expected audience.
If API Server returns the status as authenticated, that means this token
can be used to generate a new ad hoc token for MCP Server.
If API Server returns the status as not authenticated, that means this token
is invalid and MCP Server returns 401 to force the client to initiate OAuth flow.
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Serve oauth protected resource metadata endpoint
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Introduce server-url to be represented in protected resource metadata
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Add error return type in Derived function
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Return error if error occurs in Derived, when require-oauth
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Add test cases for authorization-url and server-url
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Wire server-url to audience, if it is set
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Remove redundant ssebaseurl parameter from http
feat(config): deny resources by using RESTMapper as an interceptor
This approach ensures that resources in the deny list are **always**
processed regardless of the implementation.
The RESTMapper takes care of verifying that the requested Group Version Kind
complies with the deny list while checking for the REST endpoint.
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feat(config): provide a limited clientset which check access
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review: addressed PR comments
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feat(config): provide a limited metrics clientset to check access
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review: addressed PR comments regarding pods_exec
