/*
Copyright 2024 The Dapr Authors
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
    http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package authz

import (
	"context"

	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/status"

	"github.com/dapr/dapr/pkg/security/spiffe"
)

// Request ensures that the requesting identity resides in the same
// namespace as that of the requested namespace.
func Request(ctx context.Context, namespace string) (*spiffe.Parsed, error) {
	id, ok, err := spiffe.FromGRPCContext(ctx)
	if err != nil || !ok {
		return nil, status.New(codes.PermissionDenied, "failed to determine identity").Err()
	}

	if len(namespace) == 0 || id.Namespace() != namespace {
		return nil, status.New(codes.PermissionDenied, "identity does not match requested namespace").Err()
	}

	return id, nil
}
