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IPlugin
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IRequestClassifier
On ingress: classify a request.
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IChallengeDecider
On egress: decide whether a challenge needs to be presented to the
user.
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IIdentifier
On ingress: Extract credentials from the WSGI environment and turn
them into an identity.
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IAuthenticator
On ingress: validate the identity and return a user id or None.
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IChallenger
On egress: Conditionally initiate a challenge to the user to
provide credentials.
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IMetadataProvider
On ingress: When an identity is authenticated, metadata providers
may scribble on the identity dictionary arbitrarily.
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