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|
{-# LANGUAGE DataKinds #-}
{-# LANGUAGE DeriveAnyClass #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE RankNTypes #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TupleSections #-}
{-# LANGUAGE TypeApplications #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE TypeOperators #-}
{-# LANGUAGE UndecidableInstances #-}
-- | simple server offering linting "as a service"
module Main where
import Universum
import Config (Config, loadConfig, port,
template, verbose)
import Data.Aeson (FromJSON)
import qualified Data.Aeson as A
import qualified Data.Map.Strict as M
import qualified Data.Text as T
import Data.Text.Encoding.Base64.URL (decodeBase64Unpadded)
import Data.Tiled (Tiledmap)
import Network.Wai.Handler.Warp (defaultSettings,
runSettings, setPort)
import Network.Wai.Middleware.Gzip (def)
import Network.Wai.Middleware.RequestLogger (OutputFormat (..),
RequestLoggerSettings (..),
mkRequestLogger)
import Servant (Application, Capture,
CaptureAll,
FromHttpApiData (parseUrlPiece),
Get, Handler, JSON, Raw,
Server, err400, err404,
serve, throwError,
type (:<|>) (..),
type (:>))
import Servant.Server.StaticFiles (serveDirectoryWebApp)
import Substitute (Substitutable (substitute),
SubstitutionError)
import Control.Monad.Logger
-- | a map's filename ending in .json
-- (a newtype to differentiate between maps and assets in a route)
newtype JsonFilename = JsonFilename Text
instance FromHttpApiData JsonFilename where
parseUrlPiece url =
if ".json" `T.isSuffixOf` url
then Right (JsonFilename url)
else Left url
newtype Tag = Tag Text
deriving (Generic, FromJSON)
newtype MapParams = MapParams
{ substs :: Map Text Text
} deriving (Generic, FromJSON)
instance FromHttpApiData MapParams where
parseUrlPiece urltext =
case decodeBase64Unpadded urltext of
Right text -> case A.decode (encodeUtf8 text) of
Just params -> params
Nothing -> Left "decoding params failed?"
-- for fun (and testing) also allow non-encoded json
Left _err -> case A.decode (encodeUtf8 urltext) of
Just params -> Right params
Nothing -> Left "decoding MapParams failed"
-- | actual set of routes: api for json & html + static pages from disk
type Routes =
"generate" :> Capture "params" MapParams :>
(Capture "map.json" JsonFilename :> Get '[JSON] Tiledmap
-- explicitly capture broken json to return 400 instead of looking for files
:<|> Capture "map.json" JsonFilename :> CaptureAll "rest" Text :> Get '[JSON] Void
:<|> Raw)
mkMap :: Config True -> Tiledmap -> MapParams -> ([SubstitutionError], Tiledmap)
mkMap _config basemap params =
substitute basemap (substs params)
mapHandler :: MapParams -> Config True -> JsonFilename -> Handler Tiledmap
mapHandler params config (JsonFilename mapname) =
case M.lookup mapname (snd $ view template config) of
Just basemap -> runStdoutLoggingT $
logWarnN (pretty errors) >> pure tiledmap
where (errors, tiledmap) = mkMap config basemap params
pretty errors = T.concat
. intersperse "\n "
$ concatMap (lines . show) errors
Nothing -> throwError err404
-- | Complete set of routes: API + HTML sites
server :: Config True -> Server Routes
server config params =
mapHandler params config
:<|> (\_ _ -> throwError err400)
:<|> serveDirectoryWebApp (fst . view template $ config)
app :: Config True -> Application
app = serve (Proxy @Routes) . server
main :: IO ()
main = do
config <- loadConfig "./cwality-config.toml"
loggerMiddleware <- mkRequestLogger
$ def { outputFormat = Detailed (view verbose config) }
let warpsettings =
setPort (view port config)
defaultSettings
runSettings warpsettings
. loggerMiddleware
$ app config
|
