src/main/java/emu/grasscutter/Grasscutter.java

src/main/java/emu/grasscutter/auth/AuthenticationSystem.java

...main/java/emu/grasscutter/auth/DefaultAuthentication.java

...main/java/emu/grasscutter/auth/DefaultAuthenticators.java

...main/java/emu/grasscutter/auth/ExternalAuthenticator.java

...emu/grasscutter/server/http/dispatch/DispatchHandler.java

...u/grasscutter/server/http/handlers/LegacyAuthHandler.java