mateamt/src/Main.hs

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{-# LANGUAGE OverloadedStrings #-}
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{-# LANGUAGE TypeOperators #-}
{-# LANGUAGE DataKinds #-}
{-# LANGUAGE TypeFamilies #-}
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{-# LANGUAGE FlexibleContexts #-}
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module Main where
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import Servant
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import Servant.Server.Experimental.Auth
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import Data.Time.Clock
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import Data.ByteString.Random
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import Data.ByteString.Base16 (decode)
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import Data.Set (empty)
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import Data.Maybe (isJust)
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import Database.PostgreSQL.Simple
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import Network.Wai
import Network.Wai.Logger
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import Network.Wai.Handler.Warp
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import Opaleye hiding (max)
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import Control.Monad.IO.Class (liftIO)
import Control.Monad (void)
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import Control.Monad.Reader
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import Control.Concurrent.STM.TVar
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-- internal imports
import API
import Model as M
import Types
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main :: IO ()
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main = do
conn <- connectPostgreSQL
"host='localhost' port=5432 dbname='mateamt' user='mateamt' password='mateamt'"
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store <- newTVarIO empty
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execute_ conn initUser
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execute_ conn initProduct
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execute_ conn initToken
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withStdoutLogger $ \log -> do
let settings = setPort 3000 $ setLogger log defaultSettings
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initState = ReadState
{ rsConnection = conn
, rsTicketStore = store
}
runSettings settings (app initState)
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app :: ReadState -> Application
-- app conn = serveWithContext userApi genAuthServerContext (users conn)
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app initState =
serveWithContext userApi (genAuthServerContext (rsConnection initState)) $
hoistServerWithContext
userApi
authProxy
(`runReaderT` initState)
( users :<|>
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products :<|>
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buy :<|>
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auth
)
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userApi :: Proxy UserAPI
userApi = Proxy
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authProxy :: Proxy '[ AuthHandler Request (Maybe Int) ]
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authProxy = Proxy
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genAuthServerContext
:: Connection
-> Context '[ AuthHandler Request (Maybe Int) ]
genAuthServerContext conn = authHandler conn Servant.:. EmptyContext
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type instance AuthServerData (AuthProtect "header-auth") = Maybe Int
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authHandler :: Connection -> AuthHandler Request (Maybe Int)
authHandler conn = mkAuthHandler handler
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where
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handler :: Request -> Handler (Maybe Int)
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handler req = do
let headers = requestHeaders req
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res <- case lookup "Authentication" headers of
Just hh ->
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validateToken conn (fst $ decode hh)
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_ ->
return Nothing
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return res
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users =
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userList :<|>
userNew :<|>
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userGetUpdate :<|>
userPostUpdate
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where
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userList :: Maybe Int -> Maybe Refine -> MateHandler [User]
userList muid ref = do
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conn <- rsConnection <$> ask
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userSelect conn ref
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userNew :: UserSubmit -> MateHandler Int
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userNew us = do
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now <- liftIO $ getCurrentTime
randSalt <- liftIO $ random 8
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conn <- rsConnection <$> ask
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head <$> (liftIO $ runInsert_ conn (insertUser us (utctDay now) randSalt))
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userGetUpdate :: Maybe Int -> Int -> MateHandler UserDetails
userGetUpdate Nothing _ =
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throwError $ err403
{ errBody = "No Authentication present"
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}
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userGetUpdate (Just aid) id =
if aid == id
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then do
now <- liftIO $ getCurrentTime
conn <- rsConnection <$> ask
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-- void $ liftIO $ runUpdate_ conn (updateUser id us (utctDay now))
userDetailsSelect conn id
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else
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throwError $ err403
{ errBody = "Wrong Authentication present"
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}
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userPostUpdate :: Maybe Int -> Int -> UserDetailsSubmit -> MateHandler ()
use359c65b0e68b6607a03d39f908ca26827ab97fb6e21096rPostUpdate Nothing _ _ =
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throwError $ err403
{ errBody = "No Authentication present"
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}
userPostUpdate (Just aid) id uds =
if aid == id
then do
now <- liftIO $ getCurrentTime
conn <- rsConnection <$> ask
void $ liftIO $ runUpdate_ conn (updateUserDetails id uds (utctDay now))
else
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throwError $ err403
{ errBody = "Wrong Authentication present"
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}
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products =
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list :<|>
new :<|>
update
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where
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list :: MateHandler [Product]
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list = do
conn <- rsConnection <$> ask
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productSelect conn
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new :: Maybe Int -> ProductSubmit -> MateHandler Int
new (Just _) bevsub = do
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conn <- rsConnection <$> ask
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head <$> (liftIO $ runInsert_ conn (insertProduct bevsub))
new Nothing _ =
throwError $ err403
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update :: Maybe Int -> Int -> ProductSubmit -> MateHandler ()
update (Just _) bid bevsub = do
conn <- rsConnection <$> ask
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void $ liftIO $ runUpdate_ conn (updateProduct bid bevsub)
update Nothing _ _ =
throwError $ err403
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buy :: Maybe Int -> [PurchaseDetail] -> MateHandler PurchaseResult
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buy (Just auid) pds = do
conn <- rsConnection <$> ask
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(missing, real) <- foldM (\acc@(ms, rs) pd -> do
mmiss <- checkProductAvailability conn pd
case mmiss of
Just miss -> return
( (pd {pdAmount = miss}):ms
, (pd {pdAmount = max 0 (pdAmount pd - miss)}:rs)
)
Nothing -> return
( ms
, pd:rs
)
)
([], [])
pds
void$ liftIO $ mapM_ (\pd -> runUpdate_ conn (reduceProductAmount pd)) real
price <- foldM (\total pd -> fmap (+ total) (getProductPrice pd conn)) 0 real
liftIO $ runUpdate_ conn (addToUserBalance auid (-price))
newBalance <- userBalanceSelect conn auid
return $ PurchaseResult
( if newBalance < 0
then PurchaseDebtful
else PurchaseOK
)
missing
buy Nothing pds = do
conn <- rsConnection <$> ask
(missing, real) <- foldM (\acc@(ms, rs) pd -> do
mmiss <- checkProductAvailability conn pd
case mmiss of
Just miss -> return
( (pd {pdAmount = miss}):ms
, (pd {pdAmount = max 0 (pdAmount pd - miss)}:rs)
)
Nothing -> return
( ms
, pd:rs
)
)
([], [])
pds
void $ liftIO $ mapM_ (\pd -> runUpdate_ conn (reduceProductAmount pd)) real
price <- foldM (\total pd -> fmap (+ total) (getProductPrice pd conn)) 0 real
return $ PurchaseResult
(PayAmount price)
missing
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auth =
authGet :<|>
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authSend :<|>
authLogout
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where
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authGet :: Int -> MateHandler AuthInfo
authGet id =
getUserAuthInfo id
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authSend :: AuthRequest -> MateHandler AuthResult
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authSend = processAuthRequest
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authLogout :: Maybe Int -> Int -> MateHandler ()
authLogout (Just muid) luid = do
if muid == luid
then
processLogout luid
else
throwError $ err403
{ errBody = "Forbidden"
}
authLogout Nothing _ = do
throwError $ err403
{ errBody = "Forbidden"
}