mesh: add validation hook to proxy configuration

internal/mesh/internal/controllers/proxyconfiguration/sort_test.go

@@ -99,7 +99,8 @@ func TestSortProxyConfigurations(t *testing.T) {
 			var decProxyCfgs []*types.DecodedProxyConfiguration
 			for i, ws := range c.selectors {
 				proxyCfg := &pbmesh.ProxyConfiguration{
-					Workloads: ws,
+					Workloads:     ws,
+					DynamicConfig: &pbmesh.DynamicConfig{},
 				}
 				resName := fmt.Sprintf("cfg-%d", i)
 				proxyCfgRes := resourcetest.Resource(pbmesh.ProxyConfigurationType, resName).

internal/mesh/internal/types/errors.go

@@ -0,0 +1,14 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: BUSL-1.1
+
+package types
+
+import (
+	"errors"
+)
+
+var (
+	errInvalidPort               = errors.New("port number is outside the range 1 to 65535")
+	errInvalidExposePathProtocol = errors.New("invalid protocol: only HTTP and HTTP2 protocols are allowed")
+	errMissingProxyConfigData    = errors.New("at least one of \"bootstrap_config\" or \"dynamic_config\" fields must be set")
+)

internal/mesh/internal/types/proxy_configuration.go

@@ -4,9 +4,12 @@
 package types
 
 import (
+	"math"
+
 	"github.com/hashicorp/go-multierror"
 
 	"github.com/hashicorp/consul/internal/catalog"
+
 	"github.com/hashicorp/consul/internal/resource"
 	pbmesh "github.com/hashicorp/consul/proto-public/pbmesh/v2beta1"
 	"github.com/hashicorp/consul/proto-public/pbresource"
@@ -53,23 +56,174 @@ func MutateProxyConfiguration(res *pbresource.Resource) error {
 }
 
 func ValidateProxyConfiguration(res *pbresource.Resource) error {
-	var cfg pbmesh.ProxyConfiguration
-
-	if err := res.Data.UnmarshalTo(&cfg); err != nil {
-		return resource.NewErrDataParse(&cfg, err)
+	decodedProxyCfg, decodeErr := resource.Decode[*pbmesh.ProxyConfiguration](res)
+	if decodeErr != nil {
+		return resource.NewErrDataParse(decodedProxyCfg.GetData(), decodeErr)
 	}
+	proxyCfg := decodedProxyCfg.GetData()
 
-	var merr error
+	var err error
 
-	// Validate the workload selector
-	if selErr := catalog.ValidateSelector(cfg.Workloads, false); selErr != nil {
-		merr = multierror.Append(merr, resource.ErrInvalidField{
+	if selErr := catalog.ValidateSelector(proxyCfg.Workloads, false); selErr != nil {
+		err = multierror.Append(err, resource.ErrInvalidField{
 			Name:    "workloads",
 			Wrapped: selErr,
 		})
 	}
 
-	// TODO(rb): add more validation for proxy configuration
+	if proxyCfg.GetDynamicConfig() == nil && proxyCfg.GetBootstrapConfig() == nil {
+		err = multierror.Append(err, resource.ErrInvalidFields{
+			Names:   []string{"dynamic_config", "bootstrap_config"},
+			Wrapped: errMissingProxyConfigData,
+		})
+	}
+
+	// nolint:staticcheck
+	if proxyCfg.GetOpaqueConfig() != nil {
+		err = multierror.Append(err, resource.ErrInvalidField{
+			Name:    "opaque_config",
+			Wrapped: resource.ErrUnsupported,
+		})
+	}
+
+	if dynamicCfgErr := validateDynamicProxyConfiguration(proxyCfg.GetDynamicConfig()); dynamicCfgErr != nil {
+		err = multierror.Append(err, resource.ErrInvalidField{
+			Name:    "dynamic_config",
+			Wrapped: dynamicCfgErr,
+		})
+	}
+
+	return err
+}
+
+func validateDynamicProxyConfiguration(cfg *pbmesh.DynamicConfig) error {
+	if cfg == nil {
+		return nil
+	}
+
+	var err error
+
+	// Error if any of the currently unsupported fields is set.
+	if cfg.GetMutualTlsMode() != pbmesh.MutualTLSMode_MUTUAL_TLS_MODE_DEFAULT {
+		err = multierror.Append(err, resource.ErrInvalidField{
+			Name:    "mutual_tls_mode",
+			Wrapped: resource.ErrUnsupported,
+		})
+	}
+
+	if cfg.GetMeshGatewayMode() != pbmesh.MeshGatewayMode_MESH_GATEWAY_MODE_UNSPECIFIED {
+		err = multierror.Append(err, resource.ErrInvalidField{
+			Name:    "mesh_gateway_mode",
+			Wrapped: resource.ErrUnsupported,
+		})
+	}
 
-	return merr
+	if cfg.GetAccessLogs() != nil {
+		err = multierror.Append(err, resource.ErrInvalidField{
+			Name:    "access_logs",
+			Wrapped: resource.ErrUnsupported,
+		})
+	}
+
+	if cfg.GetPublicListenerJson() != "" {
+		err = multierror.Append(err, resource.ErrInvalidField{
+			Name:    "public_listener_json",
+			Wrapped: resource.ErrUnsupported,
+		})
+	}
+
+	if cfg.GetListenerTracingJson() != "" {
+		err = multierror.Append(err, resource.ErrInvalidField{
+			Name:    "listener_tracing_json",
+			Wrapped: resource.ErrUnsupported,
+		})
+	}
+
+	if cfg.GetLocalClusterJson() != "" {
+		err = multierror.Append(err, resource.ErrInvalidField{
+			Name:    "local_cluster_json",
+			Wrapped: resource.ErrUnsupported,
+		})
+	}
+
+	// nolint:staticcheck
+	if cfg.GetLocalWorkloadAddress() != "" {
+		err = multierror.Append(err, resource.ErrInvalidField{
+			Name:    "local_workload_address",
+			Wrapped: resource.ErrUnsupported,
+		})
+	}
+
+	// nolint:staticcheck
+	if cfg.GetLocalWorkloadPort() != 0 {
+		err = multierror.Append(err, resource.ErrInvalidField{
+			Name:    "local_workload_port",
+			Wrapped: resource.ErrUnsupported,
+		})
+	}
+
+	// nolint:staticcheck
+	if cfg.GetLocalWorkloadSocketPath() != "" {
+		err = multierror.Append(err, resource.ErrInvalidField{
+			Name:    "local_workload_socket_path",
+			Wrapped: resource.ErrUnsupported,
+		})
+	}
+
+	if tproxyCfg := cfg.GetTransparentProxy(); tproxyCfg != nil {
+		if tproxyCfg.DialedDirectly {
+			err = multierror.Append(err, resource.ErrInvalidField{
+				Name: "transparent_proxy",
+				Wrapped: resource.ErrInvalidField{
+					Name:    "dialed_directly",
+					Wrapped: resource.ErrUnsupported,
+				},
+			})
+		}
+
+		if outboundListenerPortErr := validatePort(tproxyCfg.OutboundListenerPort, "outbound_listener_port"); outboundListenerPortErr != nil {
+			err = multierror.Append(err, resource.ErrInvalidField{
+				Name:    "transparent_proxy",
+				Wrapped: outboundListenerPortErr,
+			})
+		}
+	}
+
+	if exposeCfg := cfg.GetExposeConfig(); exposeCfg != nil {
+		for i, path := range exposeCfg.GetExposePaths() {
+			if listenerPortErr := validatePort(path.ListenerPort, "listener_port"); listenerPortErr != nil {
+				err = multierror.Append(err, resource.ErrInvalidField{
+					Name: "expose_config",
+					Wrapped: resource.ErrInvalidListElement{
+						Name:    "expose_paths",
+						Index:   i,
+						Wrapped: listenerPortErr,
+					},
+				})
+			}
+
+			if localPathPortErr := validatePort(path.LocalPathPort, "local_path_port"); localPathPortErr != nil {
+				err = multierror.Append(err, resource.ErrInvalidField{
+					Name: "expose_config",
+					Wrapped: resource.ErrInvalidListElement{
+						Name:    "expose_paths",
+						Index:   i,
+						Wrapped: localPathPortErr,
+					},
+				})
+			}
+		}
+	}
+
+	return err
+}
+
+func validatePort(port uint32, fieldName string) error {
+	if port < 1 || port > math.MaxUint16 {
+		return resource.ErrInvalidField{
+			Name:    fieldName,
+			Wrapped: errInvalidPort,
+		}
+	}
+	return nil
 }