fix returned error if dynamic metadata is incorrect

Signed-off-by: tjons <tyler.schade@solo.io>

internal/internal.go

@@ -7,7 +7,6 @@ package internal
 import (
 	"context"
 	"fmt"
-	"github.com/open-policy-agent/opa/topdown"
 	"math"
 	"net"
 	"net/url"
@@ -17,6 +16,8 @@ import (
 	"sync"
 	"time"
 
+	"github.com/open-policy-agent/opa/topdown"
+
 	ext_core_v2 "github.com/envoyproxy/go-control-plane/envoy/api/v2/core"
 	ext_core_v3 "github.com/envoyproxy/go-control-plane/envoy/config/core/v3"
 	ext_authz_v2 "github.com/envoyproxy/go-control-plane/envoy/service/auth/v2"
@@ -466,7 +467,9 @@ func (p *envoyExtAuthzGrpcServer) check(ctx context.Context, req interface{}) (*
 
 		dynamicMetadata, err := result.GetDynamicMetadata()
 		if err != nil {
-			return nil, stop, errors.Wrap(err, "failed to get dynamic metadata")
+			err = errors.Wrap(err, "failed to get dynamic metadata")
+			internalErr = internalError(EnvoyAuthResultErr, err)
+			return nil, stop, &internalErr
 		}
 		resp.DynamicMetadata = dynamicMetadata