[renovate] Update golangci/golangci-lint Docker tag to v1.55.1

This MR contains the following updates:

Package	Type	Update	Change
golangci/golangci-lint	image	patch	v1.55.0-alpine -> v1.55.1-alpine

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controller/northbound/server/auth.go

@@ -3,6 +3,7 @@ package server
 import (
 	"context"
 	"encoding/base64"
+	"errors"
 	"time"
 
 	apb "code.fbi.h-da.de/danet/gosdn/api/go/gosdn/rbac"
@@ -16,6 +17,7 @@ import (
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/metadata"
 	"google.golang.org/grpc/status"
+	"google.golang.org/protobuf/reflect/protoreflect"
 )
 
 // AuthServer holds a JWTManager and represents a AuthServiceServer.
@@ -39,14 +41,33 @@ func NewAuthServer(
 	}
 }
 
+func (s AuthServer) checkForValidationErrors(request protoreflect.ProtoMessage) error {
+	err := s.protoValidator.Validate(request)
+	if err != nil {
+		var valErr *protovalidate.ValidationError
+
+		if ok := errors.As(err, &valErr); ok {
+			protoErr := valErr.ToProto()
+			grpcError, _ := status.New(codes.Aborted, "Validation failed").WithDetails(protoErr)
+
+			return grpcError.Err()
+		}
+
+		return status.Errorf(codes.Aborted, "%v", err)
+	}
+
+	return nil
+}
+
 // Login logs a user in.
 func (s AuthServer) Login(ctx context.Context, request *apb.LoginRequest) (*apb.LoginResponse, error) {
 	labels := prometheus.Labels{"service": "auth", "rpc": "post"}
 	start := metrics.StartHook(labels, grpcRequestsTotal)
 	defer metrics.FinishHook(labels, start, grpcRequestDurationSecondsTotal, grpcRequestDurationSeconds)
 
-	if err := s.protoValidator.Validate(request); err != nil {
-		return nil, status.Errorf(codes.Aborted, "%v", err)
+	err := s.checkForValidationErrors(request)
+	if err != nil {
+		return nil, err
 	}
 
 	user := rbac.User{
@@ -55,7 +76,7 @@ func (s AuthServer) Login(ctx context.Context, request *apb.LoginRequest) (*apb.
 	}
 
 	// validation of credentials
-	err := s.isValidUser(user)
+	err = s.isValidUser(user)
 	if err != nil {
 		return nil, err
 	}
@@ -90,11 +111,12 @@ func (s AuthServer) Logout(ctx context.Context, request *apb.LogoutRequest) (*ap
 	start := metrics.StartHook(labels, grpcRequestsTotal)
 	defer metrics.FinishHook(labels, start, grpcRequestDurationSecondsTotal, grpcRequestDurationSeconds)
 
-	if err := s.protoValidator.Validate(request); err != nil {
-		return nil, status.Errorf(codes.Aborted, "%v", err)
+	err := s.checkForValidationErrors(request)
+	if err != nil {
+		return nil, err
 	}
 
-	err := s.handleLogout(ctx, request.Username)
+	err = s.handleLogout(ctx, request.Username)
 	if err != nil {
 		return nil, err
 	}