// etc). The Proxy is initialized when a sidecar connects to Pilot, and populated from
// 'node' info in the protocol as well as data extracted from registries.
//
// In current Istio implementation nodes use a 4-parts '~' delimited ID.
// Type~IPAddress~ID~Domain
type Proxy struct {
	sync.RWMutex

	// Type specifies the node type. First part of the ID.
	Type NodeType

	TCP *tlsv3.DownstreamTlsContext
	// HTTP describes the tls context to use for HTTP filter chains
	HTTP *tlsv3.DownstreamTlsContext
}

var authnLog = log.RegisterScope("authn", "authn debugging")

// Implementation of authn.PolicyApplier with v1beta1 API.
type policyApplier struct {
	// processedJwtRules is the consolidate JWT rules from all jwtPolicies.
	processedJwtRules []*v1beta1.JWTRule

func (v *PeerCertVerifier) AddMappings(certMap map[string][]*x509.Certificate) {
	for trustDomain, certs := range certMap {
		v.AddMapping(trustDomain, certs)
	}
}

// VerifyPeerCert is an implementation of tls.Config.VerifyPeerCertificate.
// It verifies the peer certificate using the root certificates associated with its trust domain.
func (v *PeerCertVerifier) VerifyPeerCert(rawCerts [][]byte, _ [][]*x509.Certificate) error {

	debounceMax time.Duration

	// enableEDSDebounce indicates whether EDS pushes should be debounced.
	enableEDSDebounce bool
}

// DiscoveryServer is Pilot's gRPC implementation for Envoy's xds APIs
type DiscoveryServer struct {
	// Env is the model environment.
	Env *model.Environment

	// Generators allow customizing the generated config, based on the client metadata.

// block forever on
func (con *ProxyConnection) sendDeltaRequest(req *discovery.DeltaDiscoveryRequest) {
	con.deltaRequestsChan.Put(req)
}

// DeltaAggregatedResources is an implementation of Delta XDS API used for proxying between Istiod and Envoy.
// Every time envoy makes a fresh connection to the agent, we reestablish a new connection to the upstream xds

var ValidateEnvoyFilter = validation.RegisterValidateFunc("ValidateEnvoyFilter",
	func(cfg config.Config) (Warning, error) {
		errs := Validation{}
		errs = validation.AppendWarningf(errs, "EnvoyFilter exposes internal implementation details that may change at any time. "+
			"Prefer other APIs if possible, and exercise extreme caution, especially around upgrades.")
		return validateEnvoyFilter(cfg, errs)
	})

		t.Fatal("RBAC rule not enforced")
	}
	if status.Code(err) != codes.PermissionDenied {
		t.Fatal("Unexpected error", err)
	}
	t.Log(err)
}

// From xds_resolver_test
// testClientConn is a fake implementation of resolver.ClientConn. All is does
// is to store the state received from the resolver locally and signal that
// event through a channel.
type testClientConn struct {
	resolver.ClientConn

  // validity duration so a client must check the delta between the notBefore and
  // and notAfter fields in the issued certificate to determine the actual duration.
  //
  // The v1.22+ in-tree implementations of the well-known Kubernetes signers will
  // honor this field as long as the requested duration is not greater than the
  // maximum duration they will honor per the --cluster-signing-duration CLI

type EndpointShards struct {
	// mutex protecting below map.
	sync.RWMutex

	// Shards is used to track the shards. EDS updates are grouped by shard.
	// Current implementation uses the registry name as key - in multicluster this is the
	// name of the k8s cluster, derived from the config (secret).
	Shards map[ShardKey][]*IstioEndpoint

  //   matches /foo/bar/baz, but does not match /foo/barbaz).
  // * ImplementationSpecific: Interpretation of the Path matching is up to
  //   the IngressClass. Implementations can treat this as a separate PathType
  //   or treat it identically to Prefix or Exact path types.
  // Implementations are required to support all path types.
  optional string pathType = 3;

  // backend defines the referenced service endpoint to which the traffic