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{-# LANGUAGE DataKinds #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE NamedFieldPuns #-}
{-# LANGUAGE RecordWildCards #-}
{-# LANGUAGE TypeApplications #-}
--------------------------------------------------------------------------------
module App where
--------------------------------------------------------------------------------
import Control.Monad.IO.Class (liftIO)
import Data.String.Conversions (cs)
import Data.Text (Text)
import Servant
import Servant.Server.Internal.ServerError
import API
import Utils
import Web.Cookie
import qualified Network.Wai.Handler.Warp as Warp
import qualified Network.Wai.Middleware.Cors as Cors
import qualified System.Random as Random
import qualified Email as Email
import qualified Crypto.KDF.BCrypt as BC
import qualified Data.Text.Encoding as TE
import qualified Data.UUID as UUID
import qualified Data.UUID.V4 as UUID
import qualified Types as T
import qualified Accounts as Accounts
import qualified Auth as Auth
import qualified Trips as Trips
import qualified Sessions as Sessions
import qualified LoginAttempts as LoginAttempts
import qualified PendingAccounts as PendingAccounts
--------------------------------------------------------------------------------
err429 :: ServerError
err429 = ServerError
{ errHTTPCode = 429
, errReasonPhrase = "Too many requests"
, errBody = ""
, errHeaders = []
}
-- | Send an email to recipient, `to`, with a secret code.
sendVerifyEmail :: T.Config
-> Text
-> T.Username
-> T.Email
-> T.RegistrationSecret
-> IO (Either Email.SendError Email.SendSuccess)
sendVerifyEmail T.Config{..} apiKey (T.Username username) email@(T.Email to) (T.RegistrationSecret secretUUID) = do
Email.send apiKey subject (cs body) email
where
subject = "Please confirm your account"
-- TODO(wpcarro): Use a URL encoder
-- TODO(wpcarro): Use a dynamic domain and port number
body =
let secret = secretUUID |> UUID.toString in
cs configServer ++ cs username ++ "&secret=" ++ secret
server :: T.Config -> Server API
server config@T.Config{..} = createAccount
:<|> verifyAccount
:<|> deleteAccount
:<|> listAccounts
:<|> createTrip
:<|> updateTrip
:<|> deleteTrip
:<|> listTrips
:<|> login
:<|> logout
:<|> unfreezeAccount
where
-- Admit Admins + whatever the predicate `p` passes.
adminsAnd cookie p = Auth.assert dbFile cookie (\acct@T.Account{..} -> accountRole == T.Admin || p acct)
-- Admit Admins only.
adminsOnly cookie = adminsAnd cookie (const True)
-- TODO(wpcarro): Handle failed CONSTRAINTs instead of sending 500s
createAccount :: Maybe T.SessionCookie
-> T.CreateAccountRequest
-> Handler NoContent
createAccount mCookie T.CreateAccountRequest{..} =
case (mCookie, createAccountRequestRole) of
(_, T.RegularUser) ->
doCreateAccount
(Nothing, T.Manager) ->
throwError err401 { errBody = "Only admins can create Manager accounts" }
(Nothing, T.Admin) ->
throwError err401 { errBody = "Only admins can create Admin accounts" }
(Just cookie, _) ->
adminsOnly cookie doCreateAccount
where
doCreateAccount :: Handler NoContent
doCreateAccount = do
secretUUID <- liftIO $ T.RegistrationSecret <$> Random.randomIO
liftIO $ PendingAccounts.create dbFile
secretUUID
createAccountRequestUsername
createAccountRequestPassword
createAccountRequestRole
createAccountRequestEmail
liftIO $ sendVerifyEmail config mailgunAPIKey
createAccountRequestUsername
createAccountRequestEmail
secretUUID
pure NoContent
verifyAccount :: Text -> Text -> Handler NoContent
verifyAccount username secret = do
let mSecretUUID = T.RegistrationSecret <$> UUID.fromText secret in do
case mSecretUUID of
Nothing -> throwError err401 { errBody = "Invalid secret format" }
Just secretUUID -> do
mPendingAccount <- liftIO $ PendingAccounts.get dbFile (T.Username username)
case mPendingAccount of
Nothing ->
throwError err401 { errBody = "Either your secret or your username (or both) is invalid" }
Just pendingAccount@T.PendingAccount{..} ->
if pendingAccountSecret == secretUUID then do
liftIO $ Accounts.transferFromPending dbFile pendingAccount
pure NoContent
else
throwError err401 { errBody = "The secret you provided is invalid" }
deleteAccount :: T.SessionCookie -> Text -> Handler NoContent
deleteAccount cookie username = adminsOnly cookie $ do
liftIO $ Accounts.delete dbFile (T.Username username)
pure NoContent
listAccounts :: T.SessionCookie -> Handler [T.User]
listAccounts cookie = adminsOnly cookie $ do
liftIO $ Accounts.list dbFile
createTrip :: T.SessionCookie -> T.Trip -> Handler NoContent
createTrip cookie trip@T.Trip{..} =
adminsAnd cookie (\T.Account{..} -> accountUsername == tripUsername) $ do
liftIO $ Trips.create dbFile trip
pure NoContent
updateTrip :: T.SessionCookie -> T.UpdateTripRequest -> Handler NoContent
updateTrip cookie updates@T.UpdateTripRequest{..} =
adminsAnd cookie (\T.Account{..} -> accountUsername == T.tripPKUsername updateTripRequestTripPK) $ do
mTrip <- liftIO $ Trips.get dbFile updateTripRequestTripPK
case mTrip of
Nothing -> throwError err400 { errBody = "tripKey is invalid" }
Just trip@T.Trip{..} -> do
-- TODO(wpcarro): Prefer function in Trips module that does this in a
-- DB transaction.
liftIO $ Trips.delete dbFile updateTripRequestTripPK
liftIO $ Trips.create dbFile (T.updateTrip updates trip)
pure NoContent
deleteTrip :: T.SessionCookie -> T.TripPK -> Handler NoContent
deleteTrip cookie tripPK@T.TripPK{..} =
adminsAnd cookie (\T.Account{..} -> accountUsername == tripPKUsername) $ do
liftIO $ Trips.delete dbFile tripPK
pure NoContent
listTrips :: T.SessionCookie -> Handler [T.Trip]
listTrips cookie = do
mAccount <- liftIO $ Auth.accountFromCookie dbFile cookie
case mAccount of
Nothing -> throwError err401 { errBody = "Your session cookie is invalid. Try logging out and logging back in." }
Just T.Account{..} ->
case accountRole of
T.Admin -> liftIO $ Trips.listAll dbFile
_ -> liftIO $ Trips.list dbFile accountUsername
login :: T.AccountCredentials
-> Handler (Headers '[Header "Set-Cookie" SetCookie] T.Session)
login (T.AccountCredentials username password) = do
mAccount <- liftIO $ Accounts.lookup dbFile username
case mAccount of
Just account@T.Account{..} -> do
mAttempts <- liftIO $ LoginAttempts.forUsername dbFile accountUsername
case mAttempts of
Nothing ->
if T.passwordsMatch password accountPassword then do
uuid <- liftIO $ Sessions.findOrCreate dbFile account
pure $ addHeader (Auth.mkCookie uuid)
T.Session{ sessionUsername = accountUsername
, sessionRole = accountRole
}
else do
liftIO $ LoginAttempts.increment dbFile username
throwError err401 { errBody = "Your credentials are invalid" }
Just attempts ->
if attempts >= 3 then
throwError err429
else if T.passwordsMatch password accountPassword then do
uuid <- liftIO $ Sessions.findOrCreate dbFile account
pure $ addHeader (Auth.mkCookie uuid)
T.Session{ sessionUsername = accountUsername
, sessionRole = accountRole
}
else do
liftIO $ LoginAttempts.increment dbFile username
throwError err401 { errBody = "Your credentials are invalid" }
-- In this branch, the user didn't supply a known username.
Nothing -> throwError err401 { errBody = "Your credentials are invalid" }
logout :: T.SessionCookie
-> Handler (Headers '[Header "Set-Cookie" SetCookie] NoContent)
logout cookie = do
case Auth.uuidFromCookie cookie of
Nothing ->
pure $ addHeader Auth.emptyCookie NoContent
Just uuid -> do
liftIO $ Sessions.delete dbFile uuid
pure $ addHeader Auth.emptyCookie NoContent
unfreezeAccount :: T.SessionCookie
-> T.UnfreezeAccountRequest
-> Handler NoContent
unfreezeAccount cookie T.UnfreezeAccountRequest{..} =
adminsAnd cookie (\T.Account{..} -> accountRole == T.Manager) $ do
liftIO $ LoginAttempts.reset dbFile unfreezeAccountRequestUsername
pure NoContent
run :: T.Config -> IO ()
run config@T.Config{..} =
Warp.run 3000 (enforceCors $ serve (Proxy @ API) $ server config)
where
enforceCors = Cors.cors (const $ Just corsPolicy)
corsPolicy :: Cors.CorsResourcePolicy
corsPolicy =
Cors.simpleCorsResourcePolicy
{ Cors.corsOrigins = Just ([cs configClient], True)
, Cors.corsMethods = Cors.simpleMethods ++ ["PUT", "PATCH", "DELETE", "OPTIONS"]
, Cors.corsRequestHeaders = Cors.simpleHeaders ++ ["Content-Type", "Authorization"]
}
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