Support loading configuration from an external file

README.md

@@ -26,11 +26,13 @@ source venv/bin/activate
 pip install -r requirements.txt
 ```
 
-Edit the [settings file](etesync_server/settings.py). Please refer to the
+If you are familiar with Django you can just edit the [settings file](etesync_server/settings.py)
-[Django deployment
+according to the [Django deployment checklist](https://docs.djangoproject.com/en/1.11/howto/deployment/checklist)
-checklist](https://docs.djangoproject.com/en/1.11/howto/deployment/checklist/)
+if you are not, we also provide a simple [configuration file](etesync-server.ini)
-for full instructions on how to configure a Django app for production. Some
+for easy deployment which you can use. You can either edit the provided file or
-particular settings that should be edited are:
+create one in `/etc/etesync-server`.
+
+Some particular settings that should be edited are:
   * [`ALLOWED_HOSTS`](https://docs.djangoproject.com/en/1.11/ref/settings/#std:setting-ALLOWED_HOSTS)
     -- this is the list of host/domain names or addresses on which the app
 will be served

etesync-server.ini

@@ -0,0 +1,10 @@
+[global]
+secret_file = secret.txt
+debug = false
+
+[allowed_hosts]
+;allowed_host1 = host1.tld
+
+[database]
+engine = django.db.backends.sqlite3
+name = db.sqlite3

etesync_server/settings.py

@@ -11,6 +11,7 @@ https://docs.djangoproject.com/en/2.0/ref/settings/
 """
 
 import os
+import configparser
 from .utils import get_secret_from_file
 
 # Build paths inside the project like this: os.path.join(BASE_DIR, ...)
@@ -30,6 +31,34 @@ DEBUG = False
 
 ALLOWED_HOSTS = []
 
+# Database
+# https://docs.djangoproject.com/en/2.0/ref/settings/#databases
+
+DATABASES = {
+    'default': {
+        'ENGINE': 'django.db.backends.sqlite3',
+        'NAME': os.environ.get('ETESYNC_DB_PATH',
+                               os.path.join(BASE_DIR, 'db.sqlite3')),
+    }
+}
+
+
+
+# Define where to find configuration files
+config_locations = ['etesync-server.ini', '/etc/etesync-server/etesync-server.ini']
+# Use config file if present
+if any(os.path.isfile(x) for x in config_locations):
+    config = configparser.ConfigParser()
+    config.read(config_locations)
+
+    SECRET_FILE = config['global']['secret_file']
+
+    DEBUG = config['global'].getboolean('debug')
+
+    ALLOWED_HOSTS = [y for x, y in config.items('allowed_hosts')]
+
+    DATABASES = { 'default': { x.upper(): y for x, y in config.items('database') } }
+
 
 # Application definition
 
@@ -78,18 +107,6 @@ TEMPLATES = [
 WSGI_APPLICATION = 'etesync_server.wsgi.application'
 
 
-# Database
-# https://docs.djangoproject.com/en/2.0/ref/settings/#databases
-
-DATABASES = {
-    'default': {
-        'ENGINE': 'django.db.backends.sqlite3',
-        'NAME': os.environ.get('ETESYNC_DB_PATH',
-                               os.path.join(BASE_DIR, 'db.sqlite3')),
-    }
-}
-
-
 # Password validation
 # https://docs.djangoproject.com/en/2.0/ref/settings/#auth-password-validators