github.com/cs3org/reva/v2@v2.27.7/pkg/mentix/key/siteid.go (about)

     1  // Copyright 2018-2020 CERN
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  //
    15  // In applying this license, CERN does not waive the privileges and immunities
    16  // granted to it by virtue of its status as an Intergovernmental Organization
    17  // or submit itself to any jurisdiction.
    18  
    19  package key
    20  
    21  import (
    22  	"fmt"
    23  	"hash/crc64"
    24  
    25  	"github.com/pkg/errors"
    26  )
    27  
    28  // SiteIdentifier is the type used to store site identifiers.
    29  type SiteIdentifier = string
    30  
    31  // CalculateSiteID calculates a (stable) site ID from the given API key.
    32  // 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.
    33  func CalculateSiteID(apiKey APIKey, salt string) (SiteIdentifier, error) {
    34  	if len(apiKey) != apiKeyLength {
    35  		return "", errors.Errorf("invalid API key length")
    36  	}
    37  
    38  	hash := crc64.New(crc64.MakeTable(crc64.ECMA))
    39  	_, _ = hash.Write([]byte(apiKey))
    40  	_, _ = hash.Write([]byte(salt))
    41  	value := hash.Sum(nil)
    42  	return fmt.Sprintf("%4x-%4x-%4x-%4x", value[:2], value[2:4], value[4:6], value[6:]), nil
    43  }