[REFACTOR] removed hardcoded variables, added python-dotenv

- modified hardcoded variables DEBUG and ALLOWED_HOSTS, now using env vars
- using python-dotenv for managing .env variables
- change some variables from using os.environ.get to os.getenv (as the wrapper)

pplbackend/settings.py

@@ -11,12 +11,13 @@ https://docs.djangoproject.com/en/3.0/ref/settings/
 """
 
 import os
+
 from datetime import timedelta
-import dj_database_url
+from dotenv import load_dotenv
 
 # Build paths inside the project like this: os.path.join(BASE_DIR, ...)
 BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
-
+load_dotenv(os.path.join(BASE_DIR, '.env'))
 
 # Quick-start development settings - unsuitable for production
 # See https://docs.djangoproject.com/en/3.0/howto/deployment/checklist/
@@ -26,11 +27,10 @@ SECRET_KEY = os.getenv("SECRET_KEY", 'akua')
 
 
 # SECURITY WARNING: don't run with debug turned on in production!
-DEBUG = FALSE
+DEBUG = os.getenv('DEBUG') == 'True'
 
-ALLOWED_HOSTS = ['localhost', '127.0.0.1', '10.119.105.26', 'bisago.cs.ui.ac.id']
+ALLOWED_HOSTS = os.getenv('ALLOWED_HOSTS', 'localhost').strip(';').split(';')
 
-#ALLOWED_HOSTS = ['*']
 # Application definition
 
 INSTALLED_APPS = [
@@ -96,19 +96,21 @@ WSGI_APPLICATION = 'pplbackend.wsgi.application'
 
 DATABASES = {
     'default': {
-        'ENGINE': 'django.db.backends.postgresql_psycopg2',
-        'NAME': os.environ.get('DB_NAME', ''),
-        'USER': os.environ.get('DB_USER', ''),
-        'PASSWORD': os.environ.get('DB_PASSWORD', ''),
-        'HOST': os.environ.get('DB_HOST', 'localhost'),
-        'PORT': os.environ.get('DB_PORT', '5432'),
+        'ENGINE': 'django.db.backends.sqlite3',
+        'NAME': os.path.join(BASE_DIR, 'db.sqlite3'),
     }
 }
 
-#if os.environ.get("DATABASE_URL"):
-#   DATABASES['default'] = dj_database_url.config()
-
-
+# custom database host, overriding the default
+if os.getenv('DB_HOST') is not None:
+    DATABASES['default'] = {
+        'ENGINE': 'django.db.backends.postgresql_psycopg2',
+        'NAME': os.getenv('DB_NAME'),
+        'USER': os.getenv('DB_USER'),
+        'PASSWORD': os.getenv('DB_PASSWORD'),
+        'HOST': os.getenv('DB_HOST'),
+        'PORT': os.getenv('DB_PORT'),
+    }
 
 # Password validation
 # https://docs.djangoproject.com/en/3.0/ref/settings/#auth-password-validators