46 lines
900 B
Go
46 lines
900 B
Go
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package common
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import (
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"math/rand"
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"os"
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"time"
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)
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var pwSymbols = []string{
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"abcdefghijklmnopqrstuvwxyz",
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"ABCDEFGHIJKLMNOPQRSTUVWXYZ",
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"0123456789",
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}
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var rnd = rand.New(rand.NewSource(time.Now().UnixNano() + int64(os.Getpid())))
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func RandomString(chooseFrom string, length int) (randomString string) {
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cflen := len(chooseFrom)
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for i := 0; i < length; i++ {
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randomString += string(chooseFrom[rnd.Intn(cflen)])
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}
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return
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}
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func RandomPassword() (password string) {
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pwlen := 15
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batchsize := pwlen / len(pwSymbols)
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pw := make([]byte, 0, pwlen)
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// choose character set
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for c := 0; len(pw) < pwlen; c++ {
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s := RandomString(pwSymbols[c%len(pwSymbols)], rnd.Intn(batchsize-1)+1)
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pw = append(pw, []byte(s)...)
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}
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// truncate
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pw = pw[:pwlen]
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// permute
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for c := 0; c < pwlen-1; c++ {
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i := rnd.Intn(pwlen-c) + c
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x := pw[c]
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pw[c] = pw[i]
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pw[i] = x
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}
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return string(pw)
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}
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