config.py

import json
import os
from pathlib import Path
import secrets
from typing import Any, Dict, List, Optional, Union
from functools import lru_cache
from pydantic import AnyHttpUrl, BaseSettings, HttpUrl, validator


class Settings(BaseSettings):
    SECRET_KEY: str = secrets.token_urlsafe(32)
    # 60 minutes * 24 hours * 8 days = 8 days
    ACCESS_TOKEN_EXPIRE_MINUTES: int = 60 * 24 * 8
    BACKEND_CORS_ORIGINS: List = ["*",
                                  "http://localhost:3000",
                                  "http://127.0.0.1:3000"]
    DETA_BASE_KEY: Optional[str]

    SMTP_TLS: bool = True
    SMTP_PORT: Optional[int] = None
    SMTP_HOST: Optional[str] = None
    SMTP_USER: Optional[str] = None
    SMTP_PASSWORD: Optional[str] = None
    EMAILS_FROM_EMAIL: Optional[str] = None
    EMAILS_FROM_NAME: Optional[str] = None
    EMAIL_RESET_TOKEN_EXPIRE_HOURS: int = 48
    EMAILS_ENABLED: bool = False
    USERS_OPEN_REGISTRATION: bool = False
    # Extras

    @validator("BACKEND_CORS_ORIGINS", pre=True)
    def assemble_cors_origins(cls, v: Union[str, List[str]]) -> Union[List[str], str]:
        if isinstance(v, str) and not v.startswith("["):
            return [i.strip() for i in v.split(",")]
        elif isinstance(v, (list, str)):
            return v
        raise ValueError(v)

    class Config:
        case_sensitive = True
        extra = 'ignore'


@lru_cache()
def get_settings():
    env = os.environ
    return Settings(**env)


settings = get_settings()