full-stack-fastapi-template/backend/app/core/config.py

import secrets
from typing import Any

from pydantic import (
    AnyHttpUrl,
    HttpUrl,
    PostgresDsn,
    ValidationInfo,
    field_validator,
)
from pydantic_settings import BaseSettings, SettingsConfigDict


class Settings(BaseSettings):
    API_V1_STR: str = "/api/v1"
    SECRET_KEY: str = secrets.token_urlsafe(32)
    # 60 minutes * 24 hours * 8 days = 8 days
    ACCESS_TOKEN_EXPIRE_MINUTES: int = 60 * 24 * 8
    SERVER_HOST: AnyHttpUrl
    BACKEND_CORS_ORIGINS: list[AnyHttpUrl] | str = []

    @field_validator("BACKEND_CORS_ORIGINS", mode="before")
    @classmethod
    def assemble_cors_origins(cls, v: str | list[str]) -> 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)

    PROJECT_NAME: str
    SENTRY_DSN: HttpUrl | None = None

    @field_validator("SENTRY_DSN", mode="before")
    @classmethod
    def sentry_dsn_can_be_blank(cls, v: str) -> str | None:
        if not v:
            return None
        return v

    POSTGRES_SERVER: str
    POSTGRES_USER: str
    POSTGRES_PASSWORD: str
    POSTGRES_DB: str
    SQLALCHEMY_DATABASE_URI: PostgresDsn | None = None

    @field_validator("SQLALCHEMY_DATABASE_URI", mode="before")
    def assemble_db_connection(cls, v: str | None, info: ValidationInfo) -> Any:
        if isinstance(v, str):
            return v
        return PostgresDsn.build(
            scheme="postgresql+psycopg",
            username=info.data.get("POSTGRES_USER"),
            password=info.data.get("POSTGRES_PASSWORD"),
            host=info.data.get("POSTGRES_SERVER"),
            path=f"{info.data.get('POSTGRES_DB') or ''}",
        )

    SMTP_TLS: bool = True
    SMTP_PORT: int | None = None
    SMTP_HOST: str | None = None
    SMTP_USER: str | None = None
    SMTP_PASSWORD: str | None = None
    # TODO: update type to EmailStr when sqlmodel supports it
    EMAILS_FROM_EMAIL: str | None = None
    EMAILS_FROM_NAME: str | None = None

    @field_validator("EMAILS_FROM_NAME")
    def get_project_name(cls, v: str | None, info: ValidationInfo) -> str:
        if not v:
            return info.data["PROJECT_NAME"]
        return v

    EMAIL_RESET_TOKEN_EXPIRE_HOURS: int = 48
    EMAIL_TEMPLATES_DIR: str = "/app/app/email-templates/build"
    EMAILS_ENABLED: bool = False

    @field_validator("EMAILS_ENABLED", mode="before")
    def get_emails_enabled(cls, v: bool, info: ValidationInfo) -> bool:
        return bool(
            info.data.get("SMTP_HOST")
            and info.data.get("SMTP_PORT")
            and info.data.get("EMAILS_FROM_EMAIL")
        )

    # TODO: update type to EmailStr when sqlmodel supports it
    EMAIL_TEST_USER: str = "test@example.com"
    # TODO: update type to EmailStr when sqlmodel supports it
    FIRST_SUPERUSER: str
    FIRST_SUPERUSER_PASSWORD: str
    USERS_OPEN_REGISTRATION: bool = False
    model_config = SettingsConfigDict(case_sensitive=True)


settings = Settings()