mirror of
https://github.com/freckle/yesod-auth-oauth2.git
synced 2026-01-12 04:08:30 +01:00
2d3d1d2a8e
Handles the common case of fetching profile information from a single JSON endpoint. Throws InvalidProfileResponse if JSON parsing fails.
106 lines
3.3 KiB
Haskell
106 lines
3.3 KiB
Haskell
{-# LANGUAGE CPP #-}
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{-# 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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, oauth2GithubScoped
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, module Yesod.Auth.OAuth2
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) where
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#if __GLASGOW_HASKELL__ < 710
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import Control.Applicative ((<$>), (<*>))
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#endif
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import Control.Exception.Lifted
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import Control.Monad (mzero)
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import Data.Aeson
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import Data.Monoid ((<>))
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import Data.Text (Text)
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import Data.Text.Encoding (encodeUtf8, decodeUtf8)
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import Network.HTTP.Conduit (Manager)
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import Yesod.Auth
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import Yesod.Auth.OAuth2
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import qualified Data.Text as T
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data GithubUser = GithubUser
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{ githubUserId :: Int
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, githubUserName :: Maybe Text
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, githubUserLogin :: Text
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, githubUserAvatarUrl :: Text
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}
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instance FromJSON GithubUser where
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parseJSON (Object o) = GithubUser
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<$> 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) = GithubUserEmail
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<$> 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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-> AuthPlugin m
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oauth2Github clientId clientSecret = oauth2GithubScoped clientId clientSecret ["user:email"]
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oauth2GithubScoped :: 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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oauth2GithubScoped clientId clientSecret scopes = authOAuth2 "github" oauth fetchGithubProfile
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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.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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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 _, 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
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{ credsPlugin = "github"
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, credsIdent = T.pack $ show $ githubUserId user
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, credsExtra =
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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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] ++ maybeName (githubUserName user)
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}
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where
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maybeName Nothing = []
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maybeName (Just name) = [("name", name)]
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