feat(api): load config using shared helpers

- add django settings module documentation
- use default for previously required fields

BREAKING CHANGE: The API command line interface require the
configuration file to be present. The default configuration file path is
`/etc/airtime/airtime.conf`

.github/workflows/test.yml

@@ -192,6 +192,7 @@ jobs:
       postgres:
         image: postgres
         env:
+          POSTGRES_USER: libretime
           POSTGRES_PASSWORD: libretime
         options: >-
           --health-cmd pg_isready
@@ -204,7 +205,8 @@ jobs:
       run:
         shell: bash
     env:
-      LIBRETIME_CONFIG_FILEPATH: /tmp/libretime-test.conf
+      LIBRETIME_GENERAL_API_KEY: test_key
+      LIBRETIME_DATABASE_HOST: postgres
 
     steps:
       - uses: actions/checkout@v2
@@ -216,20 +218,6 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-pip-${{ matrix.context }}
 
-      - name: Setup libretime configuration
-        run: |
-          cat <<EOF > $LIBRETIME_CONFIG_FILEPATH
-          [general]
-          api_key = test_key
-          [database]
-          host = postgres
-          port = 5432
-          name = libretime
-          user = postgres
-          password = libretime
-          EOF
-          cat $LIBRETIME_CONFIG_FILEPATH
-
       - name: Test
         run: make test
         working-directory: ${{ matrix.context }}

api/install/systemd/libretime-api.service

@@ -7,6 +7,7 @@ NotifyAccess=all
 KillSignal=SIGQUIT
 
 Environment=LIBRETIME_LOG_FILEPATH=/var/log/libretime/api.log
+Environment=LIBRETIME_CONFIG_FILEPATH=/etc/airtime/airtime.conf
 
 ExecStart=/usr/bin/uwsgi /etc/airtime/libretime-api.ini
 User=libretime-api

api/libretime_api/cli.py

@@ -7,6 +7,7 @@ import sys
 
 def main():
     os.environ.setdefault("DJANGO_SETTINGS_MODULE", "libretime_api.settings")
+    os.environ.setdefault("LIBRETIME_CONFIG_FILEPATH", "/etc/airtime/airtime.conf")
     try:
         from django.core.management import execute_from_command_line
     except ImportError as exc:

api/libretime_api/permissions.py

@@ -55,7 +55,7 @@ def check_authorization_header(request):
 
     if auth_header.startswith("Api-Key"):
         token = auth_header.split()[1]
-        if token == settings.CONFIG.get("general", "api_key"):
+        if token == settings.CONFIG.general.api_key:
             return True
     return False
 

api/libretime_api/settings/README.md

@@ -0,0 +1,7 @@
+# Django settings
+
+The structure of the django settings module is the following:
+
+- the `__init__.py` (`libretime_api.settings`) module is the django settings entrypoint. The module contains bindings between the user configuration and the django settings. **Advanced users** may edit this file to better integrate the LibreTime API in their setup.
+- the `_internal.py` module contains application settings for django.
+- the `_schema.py` module contains the schema for the user configuration parsing and validation.

api/libretime_api/settings/__init__.py

@@ -0,0 +1,46 @@
+# pylint: disable=unused-import
+from os import getenv
+
+from ._internal import (
+    AUTH_PASSWORD_VALIDATORS,
+    AUTH_USER_MODEL,
+    DEBUG,
+    INSTALLED_APPS,
+    MIDDLEWARE,
+    REST_FRAMEWORK,
+    ROOT_URLCONF,
+    TEMPLATES,
+    TEST_RUNNER,
+    WSGI_APPLICATION,
+    setup_logger,
+)
+from ._schema import Config
+
+API_VERSION = "2.0.0"
+
+LIBRETIME_LOG_FILEPATH = getenv("LIBRETIME_LOG_FILEPATH")
+LIBRETIME_CONFIG_FILEPATH = getenv("LIBRETIME_CONFIG_FILEPATH")
+
+CONFIG = Config(filepath=LIBRETIME_CONFIG_FILEPATH)
+
+SECRET_KEY = CONFIG.general.api_key
+ALLOWED_HOSTS = ["*"]
+
+DATABASES = {
+    "default": {
+        "ENGINE": "django.db.backends.postgresql",
+        "HOST": CONFIG.database.host,
+        "PORT": CONFIG.database.port,
+        "NAME": CONFIG.database.name,
+        "USER": CONFIG.database.user,
+        "PASSWORD": CONFIG.database.password,
+    }
+}
+
+LANGUAGE_CODE = "en-us"
+TIME_ZONE = "UTC"
+USE_I18N = True
+USE_L10N = True
+USE_TZ = True
+
+LOGGING = setup_logger(LIBRETIME_LOG_FILEPATH)

api/libretime_api/settings/_internal.py

@@ -1,32 +1,8 @@
-import os
-
-from .utils import get_random_string, read_config_file
-
-API_VERSION = "2.0.0"
-
-LIBRETIME_LOG_FILEPATH = os.getenv("LIBRETIME_LOG_FILEPATH")
-LIBRETIME_CONFIG_FILEPATH = os.getenv(
-    "LIBRETIME_CONFIG_FILEPATH",
-    "/etc/airtime/airtime.conf",
-)
-LIBRETIME_STATIC_ROOT = os.getenv(
-    "LIBRETIME_STATIC_ROOT",
-    "/usr/share/airtime/api",
-)
-CONFIG = read_config_file(LIBRETIME_CONFIG_FILEPATH)
-
-
-# Quick-start development settings - unsuitable for production
-# See https://docs.djangoproject.com/en/3.0/howto/deployment/checklist/
-
-# SECURITY WARNING: keep the secret key used in production secret!
-SECRET_KEY = get_random_string(CONFIG.get("general", "api_key", fallback=""))
+from os import getenv
+from typing import Optional
 
 # SECURITY WARNING: don't run with debug turned on in production!
-DEBUG = os.getenv("LIBRETIME_DEBUG", False)
-
-ALLOWED_HOSTS = ["*"]
-
+DEBUG = getenv("LIBRETIME_DEBUG")
 
 # Application definition
 
@@ -72,22 +48,6 @@ TEMPLATES = [
 
 WSGI_APPLICATION = "libretime_api.wsgi.application"
 
-
-# Database
-# https://docs.djangoproject.com/en/3.0/ref/settings/#databases
-
-DATABASES = {
-    "default": {
-        "ENGINE": "django.db.backends.postgresql",
-        "NAME": CONFIG.get("database", "name", fallback="libretime"),
-        "USER": CONFIG.get("database", "user", fallback="libretime"),
-        "PASSWORD": CONFIG.get("database", "password", fallback="libretime"),
-        "HOST": CONFIG.get("database", "host", fallback="localhost"),
-        "PORT": CONFIG.get("database", "port", fallback="5432"),
-    }
-}
-
-
 # Password validation
 # https://docs.djangoproject.com/en/3.0/ref/settings/#auth-password-validators
 
@@ -129,66 +89,53 @@ REST_FRAMEWORK = {
     "URL_FIELD_NAME": "item_url",
 }
 
-
-# Internationalization
-# https://docs.djangoproject.com/en/3.0/topics/i18n/
-
-LANGUAGE_CODE = "en-us"
-
-TIME_ZONE = "UTC"
-
-USE_I18N = True
-
-USE_L10N = True
-
-USE_TZ = True
-
-
 AUTH_USER_MODEL = "libretime_api.User"
 
 TEST_RUNNER = "libretime_api.tests.runners.ManagedModelTestRunner"
 
 
-LOGGING_HANDLERS = {
-    "console": {
-        "level": "INFO",
-        "class": "logging.StreamHandler",
-        "formatter": "simple",
-    },
-}
-
-if LIBRETIME_LOG_FILEPATH is not None:
-    LOGGING_HANDLERS["file"] = {
-        "level": "DEBUG",
-        "class": "logging.FileHandler",
-        "filename": LIBRETIME_LOG_FILEPATH,
-        "formatter": "verbose",
+# Logging
+def setup_logger(log_filepath: Optional[str]):
+    logging_handlers = {
+        "console": {
+            "level": "INFO",
+            "class": "logging.StreamHandler",
+            "formatter": "simple",
+        },
     }
 
-LOGGING = {
-    "version": 1,
-    "disable_existing_loggers": False,
-    "formatters": {
-        "simple": {
-            "format": "{levelname} {message}",
-            "style": "{",
+    if log_filepath is not None:
+        logging_handlers["file"] = {
+            "level": "DEBUG",
+            "class": "logging.FileHandler",
+            "filename": log_filepath,
+            "formatter": "verbose",
+        }
+
+    return {
+        "version": 1,
+        "disable_existing_loggers": False,
+        "formatters": {
+            "simple": {
+                "format": "{levelname} {message}",
+                "style": "{",
+            },
+            "verbose": {
+                "format": "{asctime} {module} {levelname} {message}",
+                "style": "{",
+            },
         },
-        "verbose": {
-            "format": "{asctime} {module} {levelname} {message}",
-            "style": "{",
+        "handlers": logging_handlers,
+        "loggers": {
+            "django": {
+                "handlers": logging_handlers.keys(),
+                "level": "INFO",
+                "propagate": True,
+            },
+            "libretime_api": {
+                "handlers": logging_handlers.keys(),
+                "level": "INFO",
+                "propagate": True,
+            },
         },
-    },
-    "handlers": LOGGING_HANDLERS,
-    "loggers": {
-        "django": {
-            "handlers": LOGGING_HANDLERS.keys(),
-            "level": "INFO",
-            "propagate": True,
-        },
-        "libretime_api": {
-            "handlers": LOGGING_HANDLERS.keys(),
-            "level": "INFO",
-            "propagate": True,
-        },
-    },
-}
+    }

api/libretime_api/settings/_schema.py

@@ -0,0 +1,12 @@
+from libretime_shared.config import (
+    BaseConfig,
+    DatabaseConfig,
+    GeneralConfig,
+    RabbitMQConfig,
+)
+
+
+class Config(BaseConfig):
+    general: GeneralConfig
+    database: DatabaseConfig = DatabaseConfig()
+    rabbitmq: RabbitMQConfig = RabbitMQConfig()

api/libretime_api/tests/test_permissions.py

@@ -33,7 +33,7 @@ class TestIsSystemTokenOrUser(APITestCase):
         self.assertFalse(allowed)
 
     def test_token_correct(self):
-        token = settings.CONFIG.get("general", "api_key")
+        token = settings.CONFIG.general.api_key
         request = APIRequestFactory().get(self.path)
         request.user = AnonymousUser()
         request.META["Authorization"] = f"Api-Key {token}"

api/libretime_api/tests/test_views.py

@@ -14,7 +14,7 @@ class TestFileViewSet(APITestCase):
     @classmethod
     def setUpTestData(cls):
         cls.path = "/api/v2/files/{id}/download/"
-        cls.token = settings.CONFIG.get("general", "api_key")
+        cls.token = settings.CONFIG.general.api_key
 
     def test_invalid(self):
         path = self.path.format(id="a")
@@ -49,7 +49,7 @@ class TestScheduleViewSet(APITestCase):
     @classmethod
     def setUpTestData(cls):
         cls.path = "/api/v2/schedule/"
-        cls.token = settings.CONFIG.get("general", "api_key")
+        cls.token = settings.CONFIG.general.api_key
 
     def test_schedule_item_full_length(self):
         music_dir = baker.make(

api/libretime_api/utils.py

@@ -1,30 +0,0 @@
-import random
-import string
-import sys
-from configparser import ConfigParser
-
-
-def read_config_file(config_filepath):
-    """Parse the application's config file located at config_path."""
-    config = ConfigParser()
-    try:
-        with open(config_filepath, encoding="utf-8") as config_file:
-            config.read_file(config_file)
-    except OSError as error:
-        print(
-            f"Unable to read config file at {config_filepath}: {error.strerror}",
-            file=sys.stderr,
-        )
-        return ConfigParser()
-    except Exception as error:
-        print(error, file=sys.stderr)
-        raise error
-    return config
-
-
-def get_random_string(seed):
-    """Generates a random string based on the given seed"""
-    choices = string.ascii_letters + string.digits + string.punctuation
-    seed = seed.encode("utf-8")
-    rand = random.Random(seed)
-    return [rand.choice(choices) for i in range(16)]

api/setup.py

@@ -43,6 +43,7 @@ setup(
         "dev": [
             "model_bakery",
             "psycopg2-binary",
+            f"libretime-shared @ file://localhost/{here.parent / 'shared'}#egg=libretime_shared",
         ],
     },
 )