Hails.Web.Controller

This module exports a definition of a Controller, which is simply a DC action with the Labeled HTTP Request in the environment (i.e., it is a Reader monad).

Documentation

type Controller = ReaderT ControllerState DC

A controller is simply a reader monad atop DC with the Labeled Request as the environment.

data ControllerState

Constructors

ControllerState

Fields

csRequest :: DCLabeled Request

Instances

MonadLIO DCLabel Controller

Routeable (Controller Response)

request :: Controller (DCLabeled Request)

Get the underlying request.

requestHeader :: HeaderName -> Controller (Maybe ByteString)

Get a request header

body :: Controller ByteString

Extract the body in the request (after unlabeling it).

queryParam :: ByteString -> Controller (Maybe ByteString)

Get the query parameter mathing the supplied variable name.

respond :: Routeable r => r -> Controller r

Produce a response.

redirectBack :: Controller Response

Redirect back acording to the referer header. If the header is not present redirect to root (i.e., /).

redirectBackOr :: Response -> Controller Response

Redirect back acording to the referer header. If the header is not present return the given response.