mirror of https://github.com/astaxie/beego.git
49 lines
1.3 KiB
Go
49 lines
1.3 KiB
Go
// Copyright 2014 beego Author. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package utils
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import (
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"crypto/rand"
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r "math/rand"
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"time"
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)
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// RandomCreateBytes generate random []byte by specify chars.
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func RandomCreateBytes(n int, alphabets ...byte) []byte {
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const alphanum = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
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var bytes = make([]byte, n)
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var randby bool
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if num, err := rand.Read(bytes); num != n || err != nil {
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r.Seed(time.Now().UnixNano())
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randby = true
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}
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for i, b := range bytes {
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if len(alphabets) == 0 {
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if randby {
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bytes[i] = alphanum[r.Intn(len(alphanum))]
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} else {
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bytes[i] = alphanum[b%byte(len(alphanum))]
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}
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} else {
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if randby {
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bytes[i] = alphabets[r.Intn(len(alphabets))]
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} else {
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bytes[i] = alphabets[b%byte(len(alphabets))]
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}
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}
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}
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return bytes
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}
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