Add example application

.gitignore

@@ -1,7 +1,8 @@
 *.swp
-dist/
-cabal-dev/
 .cabal-sandbox
-cabal.sandbox.config
-tags
+.env*
 .stack-work
+cabal-dev/
+cabal.sandbox.config
+dist/
+tags

circle.yml

@@ -7,7 +7,7 @@ dependencies:
     - chmod +x /tmp/stack && sudo mv /tmp/stack /usr/bin/stack
   override:
     - stack setup
-    - stack build
+    - stack build --flag yesod-auth-oauth2:example
 
 test:
   override:

example/main.hs

@@ -0,0 +1,119 @@
+-- |
+--
+-- This is a single-file example of using yesod-auth-oauth2.
+--
+-- It can be run with:
+--
+-- > stack build --flag yesod-auth-oauth2:example
+-- > stack exec yesod-auth-oauth2-example
+-- > $BROWSER http://localhost:3000
+--
+{-# LANGUAGE MultiParamTypeClasses #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE QuasiQuotes #-}
+{-# LANGUAGE RecordWildCards #-}
+{-# LANGUAGE TemplateHaskell #-}
+{-# LANGUAGE TypeFamilies #-}
+{-# LANGUAGE ViewPatterns #-}
+
+module Main where
+
+import Data.Monoid ((<>))
+import Data.Text (Text)
+import LoadEnv
+import Network.HTTP.Conduit
+import Network.Wai.Handler.Warp (runEnv)
+import System.Environment (getEnv)
+import Yesod
+import Yesod.Auth
+import Yesod.Auth.OAuth2.Github
+
+import qualified Data.Text as T
+
+data OAuthKeys = OAuthKeys
+    { oauthKeysClientId :: Text
+    , oauthKeysClientSecret :: Text
+    }
+
+loadOAuthKeysEnv :: String -> IO OAuthKeys
+loadOAuthKeysEnv prefix = OAuthKeys
+    <$> (getEnvT $ prefix <> "_CLIENT_ID")
+    <*> (getEnvT $ prefix <> "_CLIENT_SECRET")
+
+  where
+    getEnvT = fmap T.pack . getEnv
+
+data App = App
+    { appHttpManager :: Manager
+    , appGithubKeys :: OAuthKeys
+    -- , appGoogleKeys :: OAuthKeys
+    -- , etc...
+    }
+
+mkYesod "App" [parseRoutes|
+    / RootR GET
+    /auth AuthR Auth getAuth
+|]
+
+instance Yesod App where
+    -- redirect_uri must be absolute to avoid callback mismatch error
+    approot = ApprootStatic "http://localhost:3000"
+
+instance YesodAuth App where
+    type AuthId App = Text
+    loginDest _ = RootR
+    logoutDest _ = RootR
+
+    -- Disable any attempt to read persisted authenticated state
+    maybeAuthId = return Nothing
+
+    -- Copy the Creds response into the session for viewing after
+    authenticate c = do
+        mapM_ (uncurry setSession) $
+            [ ("credsIdent", credsIdent c)
+            , ("credsPlugin", credsPlugin c)
+            ] ++ credsExtra c
+
+        return $ Authenticated "1"
+
+    authHttpManager = appHttpManager
+
+    authPlugins m =
+        [ oauth2Github
+            (oauthKeysClientId $ appGithubKeys m)
+            (oauthKeysClientSecret $ appGithubKeys m)
+        -- , oauth2Google
+        --     (oauthKeysClientId $ appGoogleKeys m)
+        --     (oauthKeysClientSecret $ appGoogleKeys m)
+        -- , etc...
+        ]
+
+instance RenderMessage App FormMessage where
+    renderMessage _ _ = defaultFormMessage
+
+getRootR :: Handler Html
+getRootR = do
+    sess <- getSession
+
+    defaultLayout [whamlet|
+        <h1>Yesod Auth OAuth2 Example
+        <h2>
+            <a href=@{AuthR LoginR}>Log in
+        <h2>Session Information
+        <pre style="word-wrap: break-word;">
+            #{show sess}
+    |]
+
+mkFoundation :: IO App
+mkFoundation = do
+    loadEnv
+
+    appHttpManager <- newManager tlsManagerSettings
+    appGithubKeys <- loadOAuthKeysEnv "GITHUB"
+    -- appGoogleKeys <- loadOAuthKeysEnv "GOOGLE"
+    -- etc...
+
+    return App{..}
+
+main :: IO ()
+main = runEnv 3000 =<< toWaiApp =<< mkFoundation

stack.yaml

@@ -4,3 +4,5 @@ flags:
 packages:
 - '.'
 resolver: lts-3.5
+extra-deps:
+- load-env-0.1.1

yesod-auth-oauth2.cabal

@@ -16,6 +16,10 @@ flag network-uri
    description: Get Network.URI from the network-uri package
    default: True
 
+flag example
+  description: Build the example application
+  default: False
+
 library
     if flag(network-uri)
         build-depends: network-uri >= 2.6
@@ -49,6 +53,25 @@ library
 
     ghc-options:     -Wall
 
+executable yesod-auth-oauth2-example
+  if flag(example)
+    buildable: True
+  else
+    buildable: False
+
+  hs-source-dirs:      example
+  main-is:             main.hs
+  ghc-options:         -threaded -rtsopts -with-rtsopts=-N
+  build-depends:       base
+                     , containers
+                     , http-conduit
+                     , load-env
+                     , text
+                     , warp
+                     , yesod
+                     , yesod-auth
+                     , yesod-auth-oauth2
+
 test-suite test
   type:              exitcode-stdio-1.0
   main-is:           Spec.hs