type PolicyApplier interface {
    // InboundFilterChain returns inbound filter chain(s) to enforce the underlying authentication policy.
    InboundFilterChain(sdsUdsPath string, meta *model.NodeMetadata) []plugin.FilterChain

    // AuthNFilter returns the JWT HTTP filter to enforce the underlying authentication policy.
    // It may return nil, if no JWT validation is needed.
    JwtFilter(isXDSMarshalingToAnyEnabled bool) *http_conn.HttpFilter

    // AuthNFilter returns the (authn) HTTP filter to enforce the underlying authentication policy.
    // It may return nil, if no authentication is needed.
    AuthNFilter(proxyType model.NodeType, isXDSMarshalingToAnyEnabled bool) *http_conn.HttpFilter
}