You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: validator.go
    path of file: ./repos/kuma/pkg/tokens/builtin/zone
    
    the code of the file until where you have to start completion: package zone

import (
	"context"

	core_tokens "github.com/kumahq/kuma/pkg/core/tokens"
)

type Validator interface {
	Validate(ctx context.Context, token Token) (Identity, error)
}

type 
    
func (j *jwtValidator) Validate(ctx context.Context, token Token) (Identity, error) {
	claims := &ZoneClaims{}

	if err := j.validator.ParseWithValidation(ctx, token, claims); err != nil {
		return Identity{}, err
	}

	return Identity{
		Zone:  claims.Zone,
		Scope: claims.Scope,
	}, nil
}