mirror of
https://github.com/freckle/yesod-auth-oauth2.git
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115 lines
4.1 KiB
Haskell
115 lines
4.1 KiB
Haskell
{-# LANGUAGE OverloadedStrings #-}
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-- |
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--
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-- OAuth2 plugin for http://github.com
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--
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-- * Authenticates against github
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-- * Uses github user id as credentials identifier
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-- * Returns first_name, last_name, and email as extras
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--
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module Yesod.Auth.OAuth2.Github
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( oauth2Github
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, module Yesod.Auth.OAuth2
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) where
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import Control.Applicative ((<$>), (<*>))
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import Control.Exception.Lifted
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import Control.Monad (mzero)
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import Data.Aeson
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import Data.Text (Text)
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import Data.Monoid (mappend)
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import Data.Text.Encoding (encodeUtf8, decodeUtf8)
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import Yesod.Auth
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import Yesod.Auth.OAuth2
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import Yesod.Core
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import Yesod.Form
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import Network.HTTP.Conduit(Manager)
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import Data.UUID (toString)
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import Data.UUID.V4 (nextRandom)
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import qualified Data.ByteString as BS
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import qualified Data.Text as T
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data GithubUser = GithubUser
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{ githubUserId :: Int
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, githubUserName :: Text
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, githubUserLogin :: Text
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, githubUserAvatarUrl :: Text
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}
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instance FromJSON GithubUser where
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parseJSON (Object o) =
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GithubUser <$> o .: "id"
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<*> o .: "name"
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<*> o .: "login"
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<*> o .: "avatar_url"
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parseJSON _ = mzero
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data GithubUserEmail = GithubUserEmail
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{ githubUserEmail :: Text
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}
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instance FromJSON GithubUserEmail where
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parseJSON (Object o) =
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GithubUserEmail <$> o .: "email"
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parseJSON _ = mzero
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oauth2Github :: YesodAuth m
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=> Text -- ^ Client ID
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-> Text -- ^ Client Secret
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-> [Text] -- ^ List of scopes to request
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-> AuthPlugin m
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oauth2Github clientId clientSecret scopes = basicPlugin {apDispatch = dispatch}
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where
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oauth = OAuth2
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{ oauthClientId = encodeUtf8 clientId
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, oauthClientSecret = encodeUtf8 clientSecret
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, oauthOAuthorizeEndpoint = encodeUtf8 $ "https://github.com/login/oauth/authorize?scope=" `T.append` T.intercalate "," scopes
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, oauthAccessTokenEndpoint = "https://github.com/login/oauth/access_token"
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, oauthCallback = Nothing
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}
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withState state = authOAuth2 "github"
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(oauth {oauthOAuthorizeEndpoint = oauthOAuthorizeEndpoint oauth `BS.append` "&state=" `BS.append` encodeUtf8 state})
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fetchGithubProfile
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basicPlugin = authOAuth2 "github" oauth fetchGithubProfile
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dispatch "GET" ["forward"] = do
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state <- liftIO $ fmap (T.pack . toString) nextRandom
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setSession "githubState" state
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apDispatch (withState state) "GET" ["forward"]
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dispatch "GET" ["callback"] = do
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state <- lift $ runInputGet $ ireq textField "state"
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savedState <- lookupSession "githubState"
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apDispatch basicPlugin "GET" ["callback"]
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case savedState of
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Just saved | saved == state -> apDispatch basicPlugin "GET" ["callback"]
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Just saved -> invalidArgs ["state: " `mappend` state `mappend` ", and not: " `mappend` saved]
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_ -> invalidArgs ["state: " `mappend` state]
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dispatch method ps = apDispatch basicPlugin method ps
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fetchGithubProfile :: Manager -> AccessToken -> IO (Creds m)
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fetchGithubProfile manager token = do
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userResult <- authGetJSON manager token "https://api.github.com/user"
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mailResult <- authGetJSON manager token "https://api.github.com/user/emails"
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case (userResult, mailResult) of
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(Right user, Right []) -> throwIO $ InvalidProfileResponse "github" "no mail address for user"
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(Right user, Right mails) -> return $ toCreds user mails token
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(Left err, _) -> throwIO $ InvalidProfileResponse "github" err
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(_, Left err) -> throwIO $ InvalidProfileResponse "github" err
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toCreds :: GithubUser -> [GithubUserEmail] -> AccessToken -> Creds m
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toCreds user userMail token = Creds "github"
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(T.pack $ show $ githubUserId user)
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[ ("name", githubUserName user)
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, ("email", githubUserEmail $ head userMail)
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, ("login", githubUserLogin user)
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, ("avatar_url", githubUserAvatarUrl user)
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, ("access_token", decodeUtf8 $ accessToken token)
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]
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