authelia/internal/utils/strings.go

package utils

import (
	"math/rand"
	"time"
)

// IsStringInSlice checks if a single string is in an array of strings.
func IsStringInSlice(a string, list []string) (inSlice bool) {
	for _, b := range list {
		if b == a {
			return true
		}
	}
	return false
}

// SliceString splits a string s into an array with each item being a max of int d
// d = denominator, n = numerator, q = quotient, r = remainder.
func SliceString(s string, d int) (array []string) {
	n := len(s)
	q := n / d
	r := n % d
	for i := 0; i < q; i++ {
		array = append(array, s[i*d:i*d+d])
		if i+1 == q && r != 0 {
			array = append(array, s[i*d+d:])
		}
	}
	return
}

// RandomString generate a random string of n characters.
func RandomString(n int, characters []rune) (randomString string) {
	rand.Seed(time.Now().UnixNano())
	b := make([]rune, n)
	for i := range b {
		b[i] = characters[rand.Intn(len(characters))]
	}
	return string(b)
}