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import os
import sys
import logging
from flask import Flask
from . import settings
class ConfigurationError(Exception):
"""Raised in case of a configuration error."""
def __check_secret_key__(app: Flask) -> None:
"""Verify secret key is not empty."""
if app.config.get("SECRET_KEY", "") == "":
raise ConfigurationError("The `SECRET_KEY` settings cannot be empty.")
def check_mandatory_settings(app: Flask) -> None:
"""Verify that mandatory settings are defined in the application"""
undefined = tuple(
setting for setting in (
"SECRET_KEY", "SQL_URI", "AUTH_DB", "AUTH_MIGRATIONS",
"OAUTH2_SCOPE")
if setting not in app.config)
if len(undefined) > 0:
raise ConfigurationError(
"You must provide values for the following settings: " +
"\t* " + "\n\t* ".join(undefined))
__check_secret_key__(app)
def override_settings_with_envvars(
app: Flask, ignore: tuple[str, ...]=tuple()) -> None:
"""Override settings in `app` with those in ENVVARS"""
for setting in (key for key in app.config if key not in ignore):
app.config[setting] = os.environ.get(setting) or app.config[setting]
def setup_logging_handlers(app: Flask) -> None:
"""Setup the loggging handlers."""
stderr_handler = logging.StreamHandler(stream=sys.stderr)
app.logger.addHandler(stderr_handler)
root_logger = logging.getLogger()
root_logger.addHandler(stderr_handler)
root_logger.setLevel(app.config["LOGLEVEL"])
def create_app(config: dict = {}) -> Flask:
"""Create and return a new flask application."""
app = Flask(__name__)
# ====== Setup configuration ======
app.config.from_object(settings) # Default settings
# Override defaults with startup settings
app.config.update(config)
# Override app settings with site-local settings
if "GN_AUTH_CONF" in os.environ:
app.config.from_envvar("GN_AUTH_CONF")
override_settings_with_envvars(app)
# ====== END: Setup configuration ======
check_mandatory_settings(app)
setup_logging_handlers(app)
return app
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