We are working towards combining business logic in web and api endpoints. For
that purpose, we will introduce helper classes that will be shared between the
two routes. This is the base class for those helper classes.
The base class is quite simple at the moment. It only includes an initializer
and few helper methods to easily access app object's fields.
What this and following commits provide is mostly a refactor and deduplication.
There are almost no changes in the actual behavior of the app. In the few cases
where there are changes, they are made on the side of web endpoints and caller
part of the code is also updated respectively.
efb8cb63cc