Generate a 128 character random string in Go

generate_token.go

package main

import (
	"crypto/rand"
	"fmt"
)

func randStr(strSize int) string {
	dictionary := "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"

	var bytes = make([]byte, strSize)
	rand.Read(bytes)
	for k, v := range bytes {
		bytes[k] = dictionary[v%byte(len(dictionary))]
	}
	
	return string(bytes)
}

func main() {
	fmt.Println(randStr(128))
}