forked from hyperledger/fabric
/
util.go
67 lines (53 loc) · 1.74 KB
/
util.go
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/*
Copyright IBM Corp. 2016 All Rights Reserved.
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 ca
import (
"errors"
mrand "math/rand"
"time"
pb "github.com/hyperledger/fabric/membersrvc/protos"
)
const letterBytes = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
const (
letterIdxBits = 6 // 6 bits to represent a letter index
letterIdxMask = 1<<letterIdxBits - 1 // All 1-bits, as many as letterIdxBits
letterIdxMax = 63 / letterIdxBits // # of letter indices fitting in 63 bits
)
var rnd = mrand.NewSource(time.Now().UnixNano())
func randomString(n int) string {
b := make([]byte, n)
for i, cache, remain := n-1, rnd.Int63(), letterIdxMax; i >= 0; {
if remain == 0 {
cache, remain = rnd.Int63(), letterIdxMax
}
if idx := int(cache & letterIdxMask); idx < len(letterBytes) {
b[i] = letterBytes[idx]
i--
}
cache >>= letterIdxBits
remain--
}
return string(b)
}
//
// MemberRoleToString converts a member role representation from int32 to a string,
// according to the Role enum defined in ca.proto.
//
func MemberRoleToString(role pb.Role) (string, error) {
roleMap := pb.Role_name
roleStr := roleMap[int32(role)]
if roleStr == "" {
return "", errors.New("Undefined user role passed.")
}
return roleStr, nil
}