mirror of
https://github.com/astaxie/beego.git
synced 2024-11-24 14:50:53 +00:00
45 lines
1.2 KiB
Go
45 lines
1.2 KiB
Go
// Copyright 2014 beego Author. 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 utils
|
|
|
|
import (
|
|
"crypto/rand"
|
|
r "math/rand"
|
|
"time"
|
|
)
|
|
|
|
var alphaNum = []byte(`0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz`)
|
|
|
|
// RandomCreateBytes generate random []byte by specify chars.
|
|
func RandomCreateBytes(n int, alphabets ...byte) []byte {
|
|
if len(alphabets) == 0 {
|
|
alphabets = alphaNum
|
|
}
|
|
var bytes = make([]byte, n)
|
|
var randBy bool
|
|
if num, err := rand.Read(bytes); num != n || err != nil {
|
|
r.Seed(time.Now().UnixNano())
|
|
randBy = true
|
|
}
|
|
for i, b := range bytes {
|
|
if randBy {
|
|
bytes[i] = alphabets[r.Intn(len(alphabets))]
|
|
} else {
|
|
bytes[i] = alphabets[b%byte(len(alphabets))]
|
|
}
|
|
}
|
|
return bytes
|
|
}
|