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: identity_store_aliases.go
    path of file: ./repos/vault/vault
    
    the code of the file until where you have to start completion: // Copyright (c) HashiCorp, Inc.
// SPDX-License-Identifier: BUSL-1.1

package vault

import (
	"context"
	"fmt"
	"strings"

	"github.com/golang/protobuf/ptypes"
	"github.com/hashicorp/go-secure-stdlib/strutil"
	"github.com/hashicorp/vault/helper/identity"
	"github.com/hashicorp/vault/helper/namespace"
	"github.com/hashicorp/vault/help
    
func (i *IdentityStore) pathAliasIDDelete() framework.OperationFunc {
	return func(ctx context.Context, req *logical.Request, d *framework.FieldData) (*logical.Response, error) {
		aliasID := d.Get("id").(string)
		if aliasID == "" {
			return logical.ErrorResponse("missing alias ID"), nil
		}

		i.lock.Lock()
		defer i.lock.Unlock()

		// Create a MemDB transaction to delete entity
		txn := i.db.Txn(true)
		defer txn.Abort()

		// Fetch the alias
		alias, err := i.MemDBAliasByIDInTxn(txn, aliasID, false, false)
		if err != nil {
			return nil, err
		}

		// If there is no alias for the ID, do nothing
		if alias == nil {
			return nil, nil
		}

		ns, err := namespace.FromContext(ctx)
		if err != nil {
			return nil, err
		}
		if ns.ID != alias.NamespaceID {
			return logical.ErrorResponse("request and alias are in different namespaces"), logical.ErrPermissionDenied
		}

		// Fetch the associated entity
		entity, err := i.MemDBEntityByAliasIDInTxn(txn, alias.ID, true)
		if err != nil {
			return nil, err
		}

		// If there is no entity tied to a valid alias, something is wrong
		if entity == nil {
			return nil, fmt.Errorf("alias not associated to an entity")
		}

		aliases := []*identity.Alias{
			alias,
		}

		// Delete alias from the entity object
		err = i.deleteAliasesInEntityInTxn(txn, entity, aliases)
		if err != nil {
			return nil, err
		}

		// Update the entity index in the entities table
		err = i.MemDBUpsertEntityInTxn(txn, entity)
		if err != nil {
			return nil, err
		}

		switch alias.Local {
		case true:
			localAliases, err := i.parseLocalAliases(entity.ID)
			if err != nil {
				return nil, err
			}

			if localAliases == nil {
				return nil, nil
			}

			for i, item := range localAliases.Aliases {
				if item.ID == alias.ID {
					localAliases.Aliases = append(localAliases.Aliases[:i], localAliases.Aliases[i+1:]...)
					break
				}
			}

			marshaledAliases, err := ptypes.MarshalAny(localAliases)
			if err != nil {
				return nil, err
			}

			if err := i.localAliasPacker.PutItem(ctx, &storagepacker.Item{
				ID:      entity.ID,
				Message: marshaledAliases,
			}); err != nil {
				return nil, err
			}
		default:
			if err := i.persistEntity(ctx, entity); err != nil {
				return nil, err
			}
		}

		// Committing the transaction *after* successfully updating entity in
		// storage
		txn.Commit()

		return nil, nil
	}
}