A Django 3.2 production-grade settings

settings.py

"""
Django settings for example project.

Generated by 'django-admin startproject' using Django 3.2.5.

For more information on this file, see
https://docs.djangoproject.com/en/3.2/topics/settings/

For the full list of settings and their values, see
https://docs.djangoproject.com/en/3.2/ref/settings/
"""

from pathlib import Path

from decouple import Csv, config

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


# Quick-start development settings - unsuitable for production
# See https://docs.djangoproject.com/en/3.2/howto/deployment/checklist/

# SECURITY WARNING: keep the secret key used in production secret!
SECRET_KEY = config("SECRET_KEY", cast=str)

# SECURITY WARNING: don't run with debug turned on in production!
DEBUG = config("DEBUG", default=False, cast=bool)

ALLOWED_HOSTS = config("ALLOWED_HOSTS", default="localhost, 127.0.0.1", cast=Csv(str))


# Application definition

INSTALLED_APPS = [
    "django.contrib.admin",
    "django.contrib.auth",
    "django.contrib.contenttypes",
    "django.contrib.sessions",
    "django.contrib.messages",
    "django.contrib.staticfiles",
]

MIDDLEWARE = [
    "django.middleware.security.SecurityMiddleware",
    "django.contrib.sessions.middleware.SessionMiddleware",
    "django.middleware.common.CommonMiddleware",
    "django.middleware.csrf.CsrfViewMiddleware",
    "django.contrib.auth.middleware.AuthenticationMiddleware",
    "django.contrib.messages.middleware.MessageMiddleware",
    "django.middleware.clickjacking.XFrameOptionsMiddleware",
]

ROOT_URLCONF = "example.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 = "example.wsgi.application"


# Database
# https://docs.djangoproject.com/en/3.2/ref/settings/#databases

DATABASES = {
    "default": {
        "ENGINE": config("DB_ENGINE", cast=str),
        "HOST": config("DB_HOST", cast=str),
        "PORT": config("DB_PORT", cast=str),
        "NAME": config("DB_NAME", cast=str),
        "USER": config("DB_USER", cast=str),
        "PASSWORD": config("DB_PASSWORD", cast=str),
    }
}


# Password validation
# https://docs.djangoproject.com/en/3.2/ref/settings/#auth-password-validators

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
# https://docs.djangoproject.com/en/3.2/topics/i18n/

LANGUAGE_CODE = "en-us"

TIME_ZONE = "UTC"

USE_I18N = True

USE_L10N = True

USE_TZ = True


# Static files (CSS, JavaScript, Images)
# https://docs.djangoproject.com/en/3.2/howto/static-files/

STATIC_URL = "/static/"


# Production settings
if not DEBUG:

    # HTTP settings
    SECURE_PROXY_SSL_HEADER = ("HTTP_X_FORWARDED_PROTO", "https")
    X_FRAME_OPTIONS = "DENY"
    SECURE_REFERRER_POLICY = "same-origin"
    SECURE_CONTENT_TYPE_NOSNIFF = True
    SECURE_BROWSER_XSS_FILTER = True
    SECURE_SSL_REDIRECT = True
    SESSION_COOKIE_SECURE = True
    CSRF_COOKIE_SECURE = True
    CSRF_COOKIE_HTTPONLY = True

    # Particularly useful for file uploads
    # Too big values can lure DDoS attacks
    # Defaults to 10MB
    # Value in bytes. Convert to bytes here: https://www.gbmb.org/mb-to-bytes
    DATA_UPLOAD_MAX_MEMORY_SIZE = config("DATA_UPLOAD_MAX_MEMORY_SIZE", default=10485760, cast=int)
    FILE_UPLOAD_MAX_MEMORY_SIZE = config("FILE_UPLOAD_MAX_MEMORY_SIZE", default=10485760, cast=int)
    FILE_UPLOAD_DIRECTORY_PERMISSIONS = 0o755
    FILE_UPLOAD_PERMISSIONS = 0o644

    # Admin details
    # Admins names and emails should be symmetrically related
    # Check env.example for better understanding
    ADMINS_NAMES = config("ADMINS_NAMES", cast=Csv(str))
    ADMINS_EMAILS = config("ADMINS_EMAILS", cast=Csv(str))
    ADMINS = list(zip(ADMINS_NAMES, ADMINS_EMAILS))
    MANAGERS = ADMINS 

    EMAIL_USE_TLS = True

    SERVER_EMAIL = config("SERVER_EMAIL", cast=str)  # Used by server for admins emails
    DEFAULT_FROM_EMAIL = config("DEFAULT_FROM_EMAIL", cast=str)  # Used when emails are sent through send_mail()