policy-reader/internal/resolver/resolver.go

package resolver

import (
	"fmt"
	"strings"

	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container"
	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/ns"
	"github.com/nspcc-dev/neo-go/pkg/util"
)

// ResolveContractHash determine contract hash by resolving NNS name.
func ResolveContractHash(endpoint, contractHash string) (util.Uint160, error) {
	if hash, err := util.Uint160DecodeStringLE(contractHash); err == nil {
		return hash, nil
	}

	splitName := strings.Split(contractHash, ".")
	if len(splitName) != 2 {
		return util.Uint160{}, fmt.Errorf("invalid contract name: '%s'", contractHash)
	}

	var domain container.Domain
	domain.SetName(splitName[0])
	domain.SetZone(splitName[1])

	var nns ns.NNS
	if err := nns.Dial(endpoint); err != nil {
		return util.Uint160{}, fmt.Errorf("dial nns %s: %w", endpoint, err)
	}
	defer nns.Close()

	return nns.ResolveContractHash(domain)
}

// ResolveContainerID determine container id by resolving NNS name.
func ResolveContainerID(endpoint, namespace, containerName string) (cid.ID, error) {
	var cnrID cid.ID
	if err := cnrID.DecodeString(containerName); err == nil {
		return cnrID, nil
	}

	var domain container.Domain
	domain.SetName(containerName)
	if namespace != "" {
		domain.SetZone(namespace + ".ns")
	}

	var nns ns.NNS
	if err := nns.Dial(endpoint); err != nil {
		return cid.ID{}, fmt.Errorf("dial nns %s: %w", endpoint, err)
	}
	defer nns.Close()

	return nns.ResolveContainerDomain(domain)
}