resource_names.go

// Copyright 2021 Google LLC
//
// 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 fakekms

import (
	"fmt"
	"regexp"
)

const idPattern = "[a-zA-Z0-9_-]{1,63}"

var (
	idRegexp               = regexp.MustCompile(fmt.Sprintf("^%s$", idPattern))
	locationRegexp         = regexp.MustCompile("^projects/([^/]+)/locations/([^/]+)$")
	keyRingRegexp          = regexp.MustCompile(fmt.Sprintf("^(.*)/keyRings/(%s)$", idPattern))
	cryptoKeyRegexp        = regexp.MustCompile(fmt.Sprintf("^(.*)/cryptoKeys/(%s)$", idPattern))
	cryptoKeyVersionRegexp = regexp.MustCompile(fmt.Sprintf("^(.*)/cryptoKeyVersions/(%s)$", idPattern))
)

// checkID returns InvalidArgument if the provided ID does not comply with the KMS
// ID naming rules.
func checkID(id string) error {
	if !idRegexp.MatchString(id) {
		return errInvalidArgument("invalid id: %s", id)
	}
	return nil
}

type locationName struct {
	ProjectID, LocationID string
}

func parseLocationName(name string) (locationName, error) {
	if m := locationRegexp.FindStringSubmatch(name); m != nil {
		return locationName{ProjectID: m[1], LocationID: m[2]}, nil
	}
	return locationName{}, errMalformedName("location", name)
}

func (n locationName) Project() string {
	return fmt.Sprintf("projects/%s", n.ProjectID)
}

func (n locationName) Location() string {
	return fmt.Sprintf("projects/%s/locations/%s", n.ProjectID, n.LocationID)
}

func (n locationName) String() string {
	return n.Location()
}

type keyRingName struct {
	locationName
	KeyRingID string
}

func parseKeyRingName(name string) (keyRingName, error) {
	if m := keyRingRegexp.FindStringSubmatch(name); m != nil {
		if loc, err := parseLocationName(m[1]); err == nil {
			return keyRingName{locationName: loc, KeyRingID: m[2]}, nil
		}
	}
	return keyRingName{}, errMalformedName("key ring", name)
}

func (n keyRingName) KeyRing() string {
	return fmt.Sprintf("%s/keyRings/%s", n.Location(), n.KeyRingID)
}

func (n keyRingName) String() string {
	return n.KeyRing()
}

type cryptoKeyName struct {
	keyRingName
	CryptoKeyID string
}

func parseCryptoKeyName(name string) (cryptoKeyName, error) {
	if m := cryptoKeyRegexp.FindStringSubmatch(name); m != nil {
		if kr, err := parseKeyRingName(m[1]); err == nil {
			return cryptoKeyName{keyRingName: kr, CryptoKeyID: m[2]}, nil
		}
	}
	return cryptoKeyName{}, errMalformedName("crypto key", name)
}

func (n cryptoKeyName) CryptoKey() string {
	return fmt.Sprintf("%s/cryptoKeys/%s", n.KeyRing(), n.CryptoKeyID)
}

func (n cryptoKeyName) String() string {
	return n.CryptoKey()
}

type cryptoKeyVersionName struct {
	cryptoKeyName
	CryptoKeyVersionID string
}

func parseCryptoKeyVersionName(name string) (cryptoKeyVersionName, error) {
	if m := cryptoKeyVersionRegexp.FindStringSubmatch(name); m != nil {
		if ck, err := parseCryptoKeyName(m[1]); err == nil {
			return cryptoKeyVersionName{cryptoKeyName: ck, CryptoKeyVersionID: m[2]}, nil
		}
	}
	return cryptoKeyVersionName{}, errMalformedName("crypto key version", name)
}

func (n cryptoKeyVersionName) CryptoKeyVersion() string {
	return fmt.Sprintf("%s/cryptoKeyVersions/%s", n.CryptoKey(), n.CryptoKeyVersionID)
}

func (n cryptoKeyVersionName) String() string {
	return n.CryptoKeyVersion()
}