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// Copyright 2022 ROC. All rights reserved.
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// Use of this source code is governed by a MIT style
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// license that can be found in the LICENSE file.
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package util
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import (
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"math/rand"
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"time"
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)
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type StrType int
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const (
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NUM StrType = iota // 数字
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LOWER // 小写字母
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UPPER // 大写字母
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ALL // 全部
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CLEAR // 去除部分易混淆的字符
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)
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var fontKinds = [][]int{{10, 48}, {26, 97}, {26, 65}}
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var letters = []byte("34578acdefghjkmnpqstwxyABCDEFGHJKMNPQRSVWXY")
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// 生成随机字符串
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// size 个数 kind 模式
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func RandStr(size int, kind StrType) []byte {
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ikind, result := kind, make([]byte, size)
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isAll := kind > 2 || kind < 0
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rand.Seed(time.Now().UnixNano())
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for i := 0; i < size; i++ {
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if isAll {
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ikind = StrType(rand.Intn(int(ALL)))
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}
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scope, base := fontKinds[ikind][0], fontKinds[ikind][1]
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result[i] = uint8(base + rand.Intn(scope))
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// 不易混淆字符模式：重新生成字符
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if kind == 4 {
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result[i] = letters[rand.Intn(len(letters))]
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}
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}
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return result
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}
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