Authentication in Snap

In this recipe, we will work with authentication with help of the built-in authentication manager in snap. Snap provides a framework that can be tied to HTML templates to provide a customizable authentication mechanism. In this recipe, we will have a few routes requiring authentication, and a few without it. We will see how transitioning from one route to another requiring authentication kicks in the authentication framework.

We will also work with the SQLite backend for storing user credentials.

How to do it...

1. Create a new project, auth-in-snap, with a simple stack template:

        stack new auth-in-snap simple

2. Add a dependency on the snap-core library in the build-depends subsection of the executable section.

  executable auth-in-snap
    hs-source-dirs:      src
    main-is:             Main.hs
    default-language:    Haskell2010
    build-depends:       base >= 4.7 && < 5
                       , snap-core
                       , snap-server
      ...