We should validate the configuration files using pydantic, and generate documentation with pydantic-autodoc. As a bonus, we could implement a command line option that would generate a configuration files with the default values + the environment values. https://docs.pydantic.dev/latest/usage/settings/ Questions on Flask+pydantic_settings integration: - How to put a `BaseSettings` as a `app.conf`? The object interface is very convenient for development, Flask excepts a dict here. - A custom `BaseSettings` won't necessarily cary all the Flask configuration options, so `model_config = SettingsConfigDict(extra='allow')` might be needed. ## Todo - [x] write configuration using pydantic - [x] parse configuration with pydantic at startup - [x] find a way to keep reading secrets from files - [x] implement, test and document configuration using environment variables - [ ] refactor the existing configuration checks (for example the code that checks that the LDAP connection is valid etc.) - [ ] write a command that generates a configuration file (for example, exports a toml file from the current configuration, including the comments) - [ ] refactor Canaille so it uses pydantic object for Canaille specific configuration (maybe in another MR)