mateamt/src/Model/Auth.hs

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{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE OverloadedStrings #-}
module Model.Auth where
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import Servant (Handler)
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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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validateToken
:: PGS.Connection
-> ByteString
-> Handler (Maybe Int)
validateToken conn header = do
tokens <- liftIO $ runSelect conn (
keepWhen (\(tstr, _, _) ->
tstr .== C.constant header) <<< queryTable tokenTable
) :: Handler
[ ( ByteString
, Int
, UTCTime
)
]
case tokens of
[(_, uid, stamp)] -> do
now <- liftIO $ getCurrentTime
if diffUTCTime stamp now > 0
then return $ Just uid
else return $ Nothing
_ ->
return Nothing
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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