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{- # LANGUAGE DeriveGeneric # -}
{- # LANGUAGE OverloadedStrings # -}
module Model.Auth where
import GHC.Generics
import Control.Arrow ( ( <<< ) )
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import Control.Monad ( void )
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import Control.Monad.IO.Class ( liftIO )
import Control.Monad.Reader ( ask )
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import Control.Concurrent.STM
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import Data.Profunctor.Product ( p3 )
import qualified Database.PostgreSQL.Simple as PGS
import Data.Text ( Text )
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import qualified Data.Set as S
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import Data.Time.Calendar ( Day )
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import Data.Time.Clock
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import Data.ByteString ( ByteString )
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import Data.ByteString.Random
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import Data.Maybe ( fromMaybe )
import Opaleye
import qualified Opaleye.Constant as C
-- internal imports
import Types.Auth
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import Types.Reader
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import Model.User
initToken :: PGS . Query
initToken = " create table if not exists \ " token \ " (token_string bytea not null primary key, token_user integer not null, token_expiry timestamptz not null) "
tokenTable :: Table
( Field SqlBytea
, Field SqlInt4
, Field SqlTimestamptz
)
( Field SqlBytea
, Field SqlInt4
, Field SqlTimestamptz
)
tokenTable = table " token " (
p3
( tableField " token_string "
, tableField " token_user "
, tableField " token_expiry "
)
)
getUserAuthInfo
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:: Int
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-> MateHandler AuthInfo
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getUserAuthInfo ident = do
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conn <- rsConnection <$> ask
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users <- liftIO $ runSelect conn (
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keepWhen ( \ ( uid , _ , _ , _ , _ , _ , _ , _ , _ ) ->
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uid .== C . constant ident ) <<< queryTable userTable
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) :: MateHandler
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[ ( Int
, Text
, Int
, Day
, Maybe Text
, Maybe Int
, ByteString
, Maybe ByteString
, Maybe Int
)
]
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head <$> mapM ( \ ( i1 , i2 , i3 , i4 , i5 , i6 , i7 , i8 , i9 ) ->
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AuthInfo ( AuthSalt i7 ) ( toEnum $ fromMaybe 0 i9 ) <$> newTicket ident
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)
users
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generateToken
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:: Ticket
-> AuthHash
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-> MateHandler AuthResult
generateToken ( Ticket _ ident exp ) ( AuthHash hash ) = do
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conn <- rsConnection <$> ask
users <- liftIO $ runSelect conn (
keepWhen ( \ ( uid , _ , _ , _ , _ , _ , _ , _ , _ ) ->
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uid .== C . constant ident ) <<< queryTable userTable
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) :: MateHandler
[ ( Int
, Text
, Int
, Day
, Maybe Text
, Maybe Int
, ByteString
, Maybe ByteString
, Maybe Int
)
]
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let userHash = head $ map ( \ ( i1 , i2 , i3 , i4 , i5 , i6 , i7 , i8 , i9 ) -> i8 ) users
if userHash == Nothing || userHash == Just hash
then do
token <- liftIO $ Token
<$> ( random 23 )
<*> ( pure ident )
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<*> ( addUTCTime ( 23 * 60 ) <$> getCurrentTime )
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void $ liftIO $ runInsert_ conn ( insertToken token )
return $ Granted ( AuthToken $ tokenString token )
else
return Denied
insertToken
:: Token
-> Insert [ ByteString ]
insertToken ( Token tString tUser tExpiry ) = Insert
{ iTable = tokenTable
, iRows =
[
( C . constant tString
, C . constant tUser
, C . constant tExpiry
)
]
, iReturning = rReturning ( \ ( ident , _ , _ ) -> ident )
, iOnConflict = Nothing
}
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newTicket :: Int -> MateHandler AuthTicket
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newTicket ident = do
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store <- rsTicketStore <$> ask
rand <- liftIO $ random 23
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later <- liftIO $ ( addUTCTime 23 <$> getCurrentTime )
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let ticket = Ticket
{ ticketId = AuthTicket rand
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, ticketUser = ident
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, ticketExpiry = later
}
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liftIO $ atomically $ modifyTVar store ( \ s -> S . insert ticket s )
return ( AuthTicket rand )
processAuthRequest
:: AuthRequest
-> MateHandler AuthResult
processAuthRequest ( AuthRequest aticket hash ) = do
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store <- liftIO . readTVarIO =<< rsTicketStore <$> ask
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let mticket = S . filter ( \ st -> ticketId st == aticket ) store
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case S . toList mticket of
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[ ticket ] -> do
now <- liftIO $ getCurrentTime
if now > ticketExpiry ticket
then
return Denied
else
generateToken ticket hash
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_ -> return Denied