# Überauth CAS Strategy

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Central Authentication Service strategy for Überauth.

## Installation

1. Add `ueberauth` and `ueberauth_cas` to your list of dependencies in `mix.exs`:

   ```elixir
   def deps do
     [
       {:ueberauth, "~> 0.2"},
       {:ueberauth_cas, "~> 2.0.0"}
     ]
   end
   ```

2. Ensure `ueberauth_cas` is started before your application:

   ```elixir
   def application do
     [applications: [:ueberauth_cas]]
   end
   ```

3. Configure the CAS integration in `config/config.exs`:

   ```elixir
   config :ueberauth, Ueberauth,
     providers: [cas: {Ueberauth.Strategy.CAS, [
       base_url: "http://cas.example.com",
       callback_url: "http://your-app.example.com/auth/cas/callback",
     ]}]
   ```

4. Include the Überauth plug in your controller:

   ```elixir
   defmodule MyApp.AuthController do
     use MyApp.Web, :controller
     plug Ueberauth
     ...
   end
   ```

5. Create the request and callback routes if you haven't already:

   ```elixir
   scope "/auth", MyApp do
     pipe_through :browser

     get "/:provider", AuthController, :request
     get "/:provider/callback", AuthController, :callback
   end
   ```

6. Your controller needs to implement callbacks to deal with `Ueberauth.Auth` and `Ueberauth.Failure` responses.

## Compatibility

Überauth CAS was tested with the [Casino](http://casino.rbcas.com/) CAS server
implementation. Please let me know if Überauth CAS is incompatible with your CAS
server, and why.

The docs contain more information about protocol specifics.