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siteid.go
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siteid.go
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// Copyright 2018-2020 CERN
//
// 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.
//
// In applying this license, CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
package key
import (
"fmt"
"hash/crc64"
"github.com/pkg/errors"
)
// SiteIdentifier is the type used to store site identifiers.
type SiteIdentifier = string
// CalculateSiteID calculates a (stable) site ID from the given API key.
// The site ID is actually the CRC64 hash of the provided API key plus a salt value, thus it is stable for any given key & salt pair.
func CalculateSiteID(apiKey APIKey, salt string) (SiteIdentifier, error) {
if len(apiKey) != apiKeyLength {
return "", errors.Errorf("invalid API key length")
}
hash := crc64.New(crc64.MakeTable(crc64.ECMA))
_, _ = hash.Write([]byte(apiKey))
_, _ = hash.Write([]byte(salt))
value := hash.Sum(nil)
return fmt.Sprintf("%4x-%4x-%4x-%4x", value[:2], value[2:4], value[4:6], value[6:]), nil
}