116 lines
2.3 KiB
Go
116 lines
2.3 KiB
Go
/*
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* Copyright 2012-2024 Li Kexian
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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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*
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* A toolkit for Golang development
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* https://www.likexian.com/
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*/
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package xrand
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import (
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crand "crypto/rand"
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"encoding/base64"
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"encoding/hex"
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"math/rand"
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"time"
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)
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// Version returns package version
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func Version() string {
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return "0.2.0"
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}
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// Author returns package author
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func Author() string {
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return "[Li Kexian](https://www.likexian.com/)"
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}
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// License returns package license
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func License() string {
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return "Licensed under the Apache License 2.0"
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}
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// Int returns random int in [0, max)
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func Int(max int) int {
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if max <= 0 {
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return 0
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}
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seed := rand.NewSource(time.Now().UnixNano())
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return rand.New(seed).Intn(max)
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}
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// IntRange returns random int in [min, max)
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func IntRange(min, max int) int {
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if min > max {
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min, max = max, min
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}
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return Int(max-min) + min
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}
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// String returns n random string from 0-9,a-z,A-Z
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func String(n int) string {
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sources := "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
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return StringRange(n, sources)
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}
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// StringRange returns n random string base on source
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func StringRange(n int, source string) string {
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if source == "" {
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return ""
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}
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ss := []rune(source)
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bs := make([]rune, n)
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for i := range bs {
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bs[i] = ss[Int(len(ss))]
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}
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return string(bs)
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}
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// Bytes returns n random bytes
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func Bytes(n int) (bs []byte, err error) {
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bs = make([]byte, n)
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_, err = crand.Read(bs)
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return
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}
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// Hex returns hex string of n random bytes
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func Hex(n int) (ss string, err error) {
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bs, err := Bytes(n)
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if err != nil {
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return
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}
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ss = hex.EncodeToString(bs)
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return
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}
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// Base64 returns base64 string of n random bytes
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func Base64(n int) (ss string, err error) {
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bs, err := Bytes(n)
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if err != nil {
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return
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}
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ss = base64.StdEncoding.EncodeToString(bs)
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return
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}
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