django-settings-custom

A Django interactive command for configuration file generation.

Getting It

The project is on PyPI (https://pypi.org/project/django-settings-custom/)

pip install django-settings-custom

Installing It

To enable django_settings_custom in your project you need to add it to INSTALLED_APPS in your projects settings.py file:

INSTALLED_APPS = (
    ...
    'django_settings_custom',
    ...
)

Using It

Create a template for your target conf.ini like

[DATABASE]
NAME = { USER_VALUE }
HOST = { USER_VALUE }
PORT = { USER_VALUE }

[DATABASE_CREDENTIALS]
USER = { USER_VALUE }
PASSWORD = { ENCRYPTED_USER_VALUE }

[DJANGO]
KEY = { DJANGO_SECRET_KEY }

# A constant field
[LDAP]
URL = 'ldaps://myldap'

Configure in Django settings

Add settings.py file

SETTINGS_TEMPLATE_FILE = 'PATH_TO_YOUR_TEMPLATE_CONFIGURATION_FILE'
SETTINGS_FILE_PATH = 'TARGET_FOR_CONFIGURATION_FILE'

Launch in command line

python manage.py generate_settings

Or all in command line

python manage.py generate_settings path/to/template/settings.ini target/path/of/settings.ini

Results

The command ask user to fill missing values from template:

[user@localhost a_project]$ ./manage.py generate_conf
** Configuration file generation: **

** Configuration file generation: **
Do you want to generate the secret key for Django ? (Y/n) : y
Django secret key generated

** Enter values for configuration file content **

Value for [DATABASE] NAME: database_name
Value for [DATABASE] HOST: database_host
Value for [DATABASE] PORT: 900
Value for [DATABASE_CREDENTIALS] USER: my_user
Value for [DATABASE_CREDENTIALS] PASSWORD (will be encrypted):

Writing file at /home/user/a_project/conf.ini:
Configuration file successfully generated.
[user@localhost a_project]$ 

It generates the file /home/user/a_project/conf.ini:

[DATABASE]
NAME = database_name
HOST = database_host
PORT = 900

[DATABASE_CREDENTIALS]
USER = my_user
PASSWORD = JbAwLj5Zwz8lMrvcUZq5sP/v6eaUFY5E7U8Fmg63vxI=

# A constant field
[LDAP]
URL = 'ldaps://monldap'

[DJANGO]
KEY = w)r13ne4=id9_8xdojir)3)%%5m3r$co#jwj_)4d*_%%!0+f#sro

And to decrypt values in your code (in settings.py for example), you may use django_settings_custom.encryption.decrypt :

import configparser
from django_settings_custom import encryption

config = configparser.ConfigParser()
config.read(SETTINGS_FILE_PATH)
database_password = encryption.decrypt(config.get('DATABASE_CREDENTIALS', 'PASSWORD'))

To decrypt values, the function uses the django SECRET_KEY (must be set before).

Miscellaneous

If you don't want to use Django settings

If you don't want to add specific variables to your Django settings file, you can inherit generate_settings.Command to specify command options :

from django_settings_custom.management.commands import generate_settings


class Command(generate_settings.Command):
    settings_template_file = 'The/settings/template/file_path.ini'
    settings_file_path = 'The/target/settings/file_path.ini'

Adding custom tag

To add a custom tag, you can inherit generate_settings.Command and override the method get_value :

import random
from django_settings_custom.management.commands import generate_settings


class Command(generate_settings.Command):

    @staticmethod
    def get_value(section, key, value_type, secret_key):
        if value_type == 'RANDOM_VALUE':
            return random.uniform(0, 100)
        return super(Command, Command).get_value(section, key, value_type, secret_key)

Or a little more complex example :

from django.core.management.base import CommandError
from django_settings_custom.management.commands import generate_settings


class Command(generate_settings.Command):

    @staticmethod
    def get_value(section, key, value_type, secret_key):
        int_less_10 = value_type == 'INT_LESS_THAN_10'
        if int_less_10:
            value_type = 'USER_VALUE'
        value = super(Command, Command).get_value(section, key, value_type, secret_key)
        if int_less_10:
            try:
                value = int(value)
                if value >= 10:
                    raise CommandError('This field needs an int less than 10.')
            except ValueError:
                raise CommandError('This field needs an int.')
        return value

Documentation