ランダム文字列の生成方法

main.go

package main

import (
	"crypto/md5"
	"encoding/hex"
	"log"
	"math/rand"
	"time"

	"github.com/google/uuid"
)

const RandomChars = "abcdefghijklmnopqrstuvwxyz0123456789"

func RandomStr(size int) (result string) {
	for i := 0; i < size; i++ {
		rand.Seed(time.Now().UnixNano())
		randPos := rand.Intn(len(RandomChars) - 1)
		result += RandomChars[randPos : randPos+1]
	}
	return
}

func GetMd5(text string) string {
	hash := md5.New()
	defer hash.Reset()
	hash.Write([]byte(text))
	return hex.EncodeToString(hash.Sum(nil))
}

func main() {

	// ランダム文字列
	log.Println(RandomStr(100))

	// uuid
	uuidObj, _ := uuid.NewUUID()
	log.Println(uuidObj.String())

	// uuidのmd5
	log.Println(GetMd5(uuidObj.String()))

}