module Github.Private where
import Github.Data
import Data.Aeson
import Data.Attoparsec.ByteString.Lazy
import Data.Data
import Control.Applicative
import Data.List
import Data.CaseInsensitive (mk)
import qualified Data.ByteString.Char8 as BS
import qualified Data.ByteString.Lazy.Char8 as LBS
import Network.HTTP.Types (Method, Status(..))
import Network.HTTP.Conduit
import Data.Conduit (ResourceT)
import qualified Control.Exception as E
import Data.Maybe (fromMaybe)
data GithubAuth = GithubBasicAuth BS.ByteString BS.ByteString
| GithubOAuth String
deriving (Show, Data, Typeable, Eq, Ord)
githubGet :: (FromJSON b, Show b) => [String] -> IO (Either Error b)
githubGet = githubGet' Nothing
githubGet' :: (FromJSON b, Show b) => Maybe GithubAuth -> [String] -> IO (Either Error b)
githubGet' auth paths =
githubAPI (BS.pack "GET")
(buildUrl paths)
auth
(Nothing :: Maybe Value)
githubGetWithQueryString :: (FromJSON b, Show b) => [String] -> String -> IO (Either Error b)
githubGetWithQueryString = githubGetWithQueryString' Nothing
githubGetWithQueryString' :: (FromJSON b, Show b) => Maybe GithubAuth -> [String] -> String -> IO (Either Error b)
githubGetWithQueryString' auth paths queryString =
githubAPI (BS.pack "GET")
(buildUrl paths ++ "?" ++ queryString)
auth
(Nothing :: Maybe Value)
githubPost :: (ToJSON a, Show a, FromJSON b, Show b) => GithubAuth -> [String] -> a -> IO (Either Error b)
githubPost auth paths body =
githubAPI (BS.pack "POST")
(buildUrl paths)
(Just auth)
(Just body)
githubPatch :: (ToJSON a, Show a, FromJSON b, Show b) => GithubAuth -> [String] -> a -> IO (Either Error b)
githubPatch auth paths body =
githubAPI (BS.pack "PATCH")
(buildUrl paths)
(Just auth)
(Just body)
buildUrl :: [String] -> String
buildUrl paths = "https://api.github.com/" ++ intercalate "/" paths
githubAPI :: (ToJSON a, Show a, FromJSON b, Show b) => BS.ByteString -> String -> Maybe GithubAuth -> Maybe a -> IO (Either Error b)
githubAPI method url auth body = do
result <- doHttps method url auth (Just encodedBody)
return $ either (Left . HTTPConnectionError)
(parseJson . responseBody)
result
where encodedBody = RequestBodyLBS $ encode $ toJSON body
doHttps :: Method -> String -> Maybe GithubAuth -> Maybe (RequestBody (ResourceT IO)) -> IO (Either E.SomeException (Response LBS.ByteString))
doHttps method url auth body = do
let requestBody = fromMaybe (RequestBodyBS $ BS.pack "") body
requestHeaders = maybe [] getOAuth auth
(Just uri) = parseUrl url
request = uri { method = method
, secure = True
, port = 443
, requestBody = requestBody
, requestHeaders = requestHeaders
, checkStatus = successOrMissing
}
authRequest = getAuthRequest auth request
(getResponse authRequest >>= return . Right) `E.catches` [
E.Handler (\e -> E.throw (e :: E.AsyncException)),
E.Handler (\e -> (return . Left) (e :: E.SomeException))
]
where
getAuthRequest (Just (GithubBasicAuth user pass)) = applyBasicAuth user pass
getAuthRequest _ = id
getBasicAuth (GithubBasicAuth user pass) = applyBasicAuth user pass
getBasicAuth _ = id
getOAuth (GithubOAuth token) = [(mk (BS.pack "Authorization"),
BS.pack ("token " ++ token))]
getOAuth _ = []
getResponse request = withManager $ \manager -> httpLbs request manager
successOrMissing s@(Status sci _) hs
| (200 <= sci && sci < 300) || sci == 404 = Nothing
| otherwise = Just $ E.toException $ StatusCodeException s hs
parseJson :: (FromJSON b, Show b) => LBS.ByteString -> Either Error b
parseJson jsonString =
let parsed = parse (fromJSON <$> json) jsonString in
case parsed of
Data.Attoparsec.ByteString.Lazy.Done _ jsonResult -> do
case jsonResult of
(Success s) -> Right s
(Error e) -> Left $ JsonError $ e ++ " on the JSON: " ++ LBS.unpack jsonString
(Fail _ _ e) -> Left $ ParseError e