ActionController filters provide a way to register callbacks that run
before, after or around an action (i.e. HTTP request handler). They run
in the same class context as the action, so can get/set instance
variables and generally interact with the action in arbitrary ways.
In order to track flow between filters and actions, we have to model the
callback chain. This commit does that. A later change will add dataflow
steps to actually track flow through the chain.
Add type summaries to recognise instances of Mime::Type, and recognise
arguments to Mime::Type.match? and Mime::Type.=~ as regular expression
interpretations.
ActionDispatch modelling now understands that
match "/foo", to: "foo#bar", via: :all
is equivalent to
match "/foo",
to: "foo#bar",
via: [:get, :post, :put, :patch, :delete]
Add `Route` classes which model Rails routing information, typically
defined in a `routes.rb` file. We extract only the most basic
information: HTTP method, path, controller and action. This is enough to
determine whether a given controller method is a route handler, and what
HTTP method it handles, which is useful for, among other things, the URL
redirect query.
