func GeneratePassword()

in internal/accounts/accounts_windows.go [181:242]
47 lines of code
9 McCabe index (conditional complexity)

func GeneratePassword(userPwLgth int) (string, error) {
	var pwLgth int
	minPwLgth := 15
	maxPwLgth := 255
	lower := []byte("abcdefghijklmnopqrstuvwxyz")
	upper := []byte("ABCDEFGHIJKLMNOPQRSTUVWXYZ")
	numbers := []byte("0123456789")
	special := []byte(`~!@#$%^&*_-+=|\(){}[]:;<>,.?/`)
	chars := bytes.Join([][]byte{lower, upper, numbers, special}, nil)
	pwLgth = minPwLgth
	if userPwLgth > minPwLgth {
		pwLgth = userPwLgth
	}
	if userPwLgth > maxPwLgth {
		pwLgth = maxPwLgth
	}

	var pwd []byte

	// Get one of each character type.
	// Get a lowercase letter.
	lowerIndex, err := rand.Int(rand.Reader, big.NewInt(int64(len(lower))))
	if err != nil {
		return "", fmt.Errorf("failed to generate password: %v", err)
	}
	pwd = append(pwd, lower[lowerIndex.Int64()])

	// Get an uppercase letter.
	upperIndex, err := rand.Int(rand.Reader, big.NewInt(int64(len(upper))))
	if err != nil {
		return "", fmt.Errorf("failed to generate password: %v", err)
	}
	pwd = append(pwd, upper[upperIndex.Int64()])

	// Get a number.
	numbersIndex, err := rand.Int(rand.Reader, big.NewInt(int64(len(numbers))))
	if err != nil {
		return "", fmt.Errorf("failed to generate password: %v", err)
	}
	pwd = append(pwd, numbers[numbersIndex.Int64()])

	// Get a special character.
	specialIndex, err := rand.Int(rand.Reader, big.NewInt(int64(len(special))))
	if err != nil {
		return "", fmt.Errorf("failed to generate password: %v", err)
	}
	pwd = append(pwd, special[specialIndex.Int64()])

	// Fill the rest with random characters.
	for i := 0; i < pwLgth-4; i++ {
		// Get a random character.
		randomIndex, err := rand.Int(rand.Reader, big.NewInt(int64(len(chars))))
		if err != nil {
			return "", fmt.Errorf("failed to generate password: %v", err)
		}
		pwd = append(pwd, chars[randomIndex.Int64()])
	}

	// Shuffle the password.
	mathRand.Shuffle(len(pwd), func(i, j int) { pwd[i], pwd[j] = pwd[j], pwd[i] })
	return string(pwd), nil
}