import os, random, string


class Config:
    SECRET_KEY = os.environ.get('SECRET_KEY') or \
            ''.join(random.choices(string.ascii_letters, k=20))
    DATA_DIR   = os.environ.get('DATA_DIR') or os.path.join(os.path.dirname(__file__), 'tmp')
    MAX_LENGTH = os.environ.get('MAX_LENGTH') or 180
    KBITS      = os.environ.get('KBITS') or 128