import logging
import random

from django.utils.crypto import get_random_string

logger = logging.getLogger(__name__)


def rand_str(length=32, type="lower_hex"):
    """
    生成指定长度的随机字符串或者数字, 可以用于密钥等安全场景
    :param length: 字符串或者数字的长度
    :param type: str 代表随机字符串，num 代表随机数字
    :return: 字符串
    """
    if type == "str":
        return get_random_string(length, allowed_chars="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789")
    elif type == "lower_str":
        return get_random_string(length, allowed_chars="abcdefghijklmnopqrstuvwxyz0123456789")
    elif type == "lower_hex":
        return random.choice("123456789abcdef") + get_random_string(length - 1, allowed_chars="0123456789abcdef")
    else:
        return random.choice("123456789") + get_random_string(length - 1, allowed_chars="0123456789")