[Haskell-cafe] happstack-authenticate 2

Jeremy Shaw jeremy at n-heptane.com
Tue Aug 4 04:20:19 UTC 2015


The tough problem that happstack-authenticate faces is that it has to be
application agnostic. It doesn't really know much at all about how your
application handles routing, how it deals with initializing and cleaning up
database connections, etc. So, it all it can do is provide you with the
functions you will need to initialize, route, and shutdown the
authentication stuff.

routeAuthentication is absolutely necessary -- how else would requests get
routed to the authentication library?

The authenticateState is provided in case you do want direct access to it,
and so that you can pass it to routeAuthenticate. But you don't really need
to carry it around everywhere -- you need only pass it to your routing


You can see there that it passes the routeAuthentication function into a
the 'implSite' in the routing monad. But the values are not stored in State
or anything.

In the example, everything is done in main :: IO (), because that is pretty
much all the application does.

In  clckwrks, things are deferred until much later. In fact, the
authentication layer in clckwrks is implemented as a clckwrks plugin. So,
it does not initialize the authentication until it gets around to
initializing the plugins:


 - jeremy

On Mon, Aug 3, 2015 at 6:02 AM, Corentin Dupont <corentin.dupont at gmail.com>

> Hello,
> I'm a bit confused about the routeAuthenticate and authenticateState bits
> in the new happstack-authenticate.
> It seems that I have to do this in the beginning of my application:
> (_, routeAuthenticate, authenticateState) <-
>       liftIO $ initAuthentication Nothing (const $ return True)
>         [ initPassword "http://localhost:8000/#resetPassword" "example.org
> "
>         , initOpenId]
> Where this should be done? In the main? If possible I'd prefer to delay it
> because my main is web-agnotic.
> Where should I store those two values? Should I put them in my monad stack
> (I have a StateT)?
> Is the routeAuthenticate really necessary? It looks a bit cumbersome to
> carry it around everywhere in the states.
> Thanks,
> Corentin
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