ai_web/backend/config/settings.py

"""
Django settings for ai_web project.
"""
import os
from decimal import Decimal
from pathlib import Path
from datetime import timedelta
from dotenv import load_dotenv

# Load environment variables
load_dotenv()

# Environment helpers
def _env_bool(key: str, default: bool = False) -> bool:
    value = os.getenv(key, str(default))
    return str(value).strip().lower() in {"1", "true", "yes", "y", "on"}


def _env_csv(key: str, default: str) -> list[str]:
    raw = os.getenv(key)
    if raw is None:
        raw = default
    return [item.strip() for item in raw.split(",") if item.strip()]

# Build paths inside the project like this: BASE_DIR / 'subdir'.
BASE_DIR = Path(__file__).resolve().parent.parent

# SECURITY WARNING: keep the secret key used in production secret!
DEBUG = _env_bool("DEBUG", False)
SECRET_KEY = os.getenv("DJANGO_SECRET_KEY")
if not SECRET_KEY:
    if DEBUG:
        SECRET_KEY = "django-insecure-dev-key"
    else:
        raise RuntimeError("DJANGO_SECRET_KEY is required in production")

ALLOWED_HOSTS = _env_csv("ALLOWED_HOSTS", "localhost,127.0.0.1" if DEBUG else "")
if not DEBUG and not ALLOWED_HOSTS:
    raise RuntimeError("ALLOWED_HOSTS must be configured in production")


# Application definition
INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    # Third party
    'corsheaders',
    'ninja_jwt',
    # Local apps
    'apps.users',
    'apps.products',
    'apps.bounties',
    'apps.favorites',
    'apps.notifications',
    'apps.admin.apps.AdminApiConfig',
]

MIDDLEWARE = [
    'corsheaders.middleware.CorsMiddleware',
    'django.middleware.security.SecurityMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.common.CommonMiddleware',
    'config.middleware.RateLimitMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'config.middleware.ETagMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
]

ROOT_URLCONF = 'config.urls'

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [],
        'APP_DIRS': True,
        'OPTIONS': {
            'context_processors': [
                'django.template.context_processors.debug',
                'django.template.context_processors.request',
                'django.contrib.auth.context_processors.auth',
                'django.contrib.messages.context_processors.messages',
            ],
        },
    },
]

WSGI_APPLICATION = 'config.wsgi.application'


# Database
DB_ENGINE = os.getenv("DB_ENGINE", "sqlite").lower()
if DB_ENGINE == "mysql":
    DATABASES = {
        "default": {
            "ENGINE": "django.db.backends.mysql",
            "NAME": os.getenv("DB_NAME", "ai_web"),
            "USER": os.getenv("DB_USER", "root"),
            "PASSWORD": os.getenv("DB_PASSWORD", ""),
            "HOST": os.getenv("DB_HOST", "localhost"),
            "PORT": os.getenv("DB_PORT", "3306"),
            "OPTIONS": {
                "charset": "utf8mb4",
            },
        }
    }
else:
    DATABASES = {
        "default": {
            "ENGINE": "django.db.backends.sqlite3",
            "NAME": BASE_DIR / "db.sqlite3",
        }
    }


# Password validation
AUTH_PASSWORD_VALIDATORS = [
    {
        'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
    },
]


# Internationalization
LANGUAGE_CODE = 'zh-hans'
TIME_ZONE = 'Asia/Shanghai'
USE_I18N = True
USE_TZ = True


# Static files (CSS, JavaScript, Images)
STATIC_URL = 'static/'
STATIC_ROOT = BASE_DIR / 'staticfiles'


# Default primary key field type
DEFAULT_AUTO_FIELD = 'django.db.models.BigAutoField'


# Custom user model
AUTH_USER_MODEL = 'users.User'


# CORS settings
CORS_ALLOWED_ORIGINS = _env_csv(
    "CORS_ALLOWED_ORIGINS",
    "http://localhost:5173,http://127.0.0.1:5173" if DEBUG else "",
)
if not DEBUG and not CORS_ALLOWED_ORIGINS:
    raise RuntimeError("CORS_ALLOWED_ORIGINS must be configured in production")
CORS_ALLOW_CREDENTIALS = True
CSRF_TRUSTED_ORIGINS = _env_csv(
    "CSRF_TRUSTED_ORIGINS",
    "http://localhost:5173,http://127.0.0.1:5173" if DEBUG else "",
)


# JWT settings
NINJA_JWT = {
    'ACCESS_TOKEN_LIFETIME': timedelta(hours=24),
    'REFRESH_TOKEN_LIFETIME': timedelta(days=7),
    'ALGORITHM': 'HS256',
    'SIGNING_KEY': SECRET_KEY,
    'AUTH_HEADER_TYPES': ('Bearer',),
    'AUTH_COOKIE': 'access_token',
    'AUTH_COOKIE_HTTP_ONLY': True,
    'AUTH_COOKIE_SECURE': not DEBUG,
    'AUTH_COOKIE_SAMESITE': 'Lax',
}

# Cache settings
CACHES = {
    "default": {
        "BACKEND": "django.core.cache.backends.locmem.LocMemCache",
        "LOCATION": "ai_web_cache",
        "TIMEOUT": int(os.getenv("CACHE_DEFAULT_TIMEOUT", "300")),
    }
}
CACHE_TTL_SECONDS = int(os.getenv("CACHE_TTL_SECONDS", "60"))
ETAG_MAX_BYTES = int(os.getenv("ETAG_MAX_BYTES", str(2 * 1024 * 1024)))

# Security settings for production
if not DEBUG:
    SECURE_SSL_REDIRECT = _env_bool("SECURE_SSL_REDIRECT", True)
    SECURE_PROXY_SSL_HEADER = ("HTTP_X_FORWARDED_PROTO", "https")
    SESSION_COOKIE_SECURE = True
    CSRF_COOKIE_SECURE = True
    SESSION_COOKIE_SAMESITE = "Lax"
    CSRF_COOKIE_SAMESITE = "Lax"
    SECURE_HSTS_SECONDS = int(os.getenv("SECURE_HSTS_SECONDS", "31536000"))
    SECURE_HSTS_INCLUDE_SUBDOMAINS = _env_bool("SECURE_HSTS_INCLUDE_SUBDOMAINS", True)
    SECURE_HSTS_PRELOAD = _env_bool("SECURE_HSTS_PRELOAD", True)
    SECURE_REFERRER_POLICY = os.getenv("SECURE_REFERRER_POLICY", "same-origin")


# Stripe settings
STRIPE_SECRET_KEY = os.getenv('STRIPE_SECRET_KEY', '')
STRIPE_WEBHOOK_SECRET = os.getenv('STRIPE_WEBHOOK_SECRET', '')
STRIPE_PUBLISHABLE_KEY = os.getenv('STRIPE_PUBLISHABLE_KEY', '')

# Bounty settings
BOUNTY_MIN_REWARD = Decimal(os.getenv("BOUNTY_MIN_REWARD", "0.01"))
BOUNTY_MAX_REWARD = Decimal(os.getenv("BOUNTY_MAX_REWARD", "99999999.99"))
BOUNTY_PLATFORM_FEE_PERCENT = Decimal(os.getenv("BOUNTY_PLATFORM_FEE_PERCENT", "0.05"))


# OAuth settings (Manus SDK compatible)
OAUTH_CLIENT_ID = os.getenv("OAUTH_CLIENT_ID", "")
OAUTH_CLIENT_SECRET = os.getenv("OAUTH_CLIENT_SECRET", "")
OAUTH_REDIRECT_URI = os.getenv("OAUTH_REDIRECT_URI", "http://localhost:8000/api/auth/callback")
OAUTH_AUTHORIZE_URL = os.getenv("OAUTH_AUTHORIZE_URL", "")
OAUTH_TOKEN_URL = os.getenv("OAUTH_TOKEN_URL", "")
OAUTH_USERINFO_URL = os.getenv("OAUTH_USERINFO_URL", "")

# Basic rate limiting
RATE_LIMIT_ENABLE = _env_bool("RATE_LIMIT_ENABLE", not DEBUG)
RATE_LIMIT_REQUESTS = int(os.getenv("RATE_LIMIT_REQUESTS", "120"))
RATE_LIMIT_WINDOW_SECONDS = int(os.getenv("RATE_LIMIT_WINDOW_SECONDS", "60"))
RATE_LIMIT_PATHS = _env_csv("RATE_LIMIT_PATHS", "/api/")