clientPackage client implements OAuth2 authentication for outbound connections from Appengine using the application services account.
serverPackage server implements authentication for inbound HTTP requests on GAE.
server/gaesignerPackage gaesigner implements signing.Signer interface using GAE App Identity API.
server/internal/authdbimplPackage authdbimpl implements datastore-based storage and update of AuthDB snapshots used for authorization decisions by server/auth/*.

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