Lint libs folder (partial)

libs/api-bot/src/Network/Wire/Bot/Assert.hs

@@ -63,8 +63,8 @@ awaitOtrMessage ::
   m (Maybe (ConvEvent OtrMessage))
 awaitOtrMessage c (from, fc) (to, tc) =
   awaitEvent to TConvOtrMessageAdd assertion >>= \case
-    Just (EOtrMessage m) -> return (Just m)
-    _ -> return Nothing
+    Just (EOtrMessage m) -> pure (Just m)
+    _ -> pure Nothing
   where
     assertion (EOtrMessage evt) =
       let e = convEvtData evt
@@ -83,7 +83,7 @@ assertMembersJoined ::
   -- | Users who have (presumably) joined
   Maybe (ConvEvent SimpleMembers) ->
   m ()
-assertMembersJoined _ Nothing = return ()
+assertMembersJoined _ Nothing = pure ()
 assertMembersJoined bs (Just e) = forM_ bs $ \b ->
   assertEvent b TConvMemberJoin memAdd
   where
@@ -99,7 +99,7 @@ assertMembersLeft ::
   -- | Users who have (presumably) left
   Maybe (ConvEvent UserIdList) ->
   m ()
-assertMembersLeft _ Nothing = return ()
+assertMembersLeft _ Nothing = pure ()
 assertMembersLeft bs (Just e) = forM_ bs $ \b ->
   assertEvent b TConvMemberLeave memRem
   where

libs/api-bot/src/Network/Wire/Bot/Cache.hs

@@ -58,7 +58,7 @@ fromFile logger gen domain path = do
   triples <- map (Text.splitOn ",") . Text.lines <$> Text.readFile path
   shuffled <- V.toList <$> uniformShuffle (V.fromList triples) gen
   c <- newIORef =<< foldM (toUser logger domain) [] shuffled
-  return (Cache c)
+  pure (Cache c)
 
 empty :: IO Cache
 empty = Cache <$> newIORef []
@@ -82,7 +82,7 @@ toUser _ domain acc [i, e, p] = do
   let ie = error "Cache.toUser: invalid email"
   let ui = fromMaybe iu . fromByteString . encodeUtf8 . Text.toStrict . Text.strip $ i
   let em = fromMaybe ie . parseEmail . Text.toStrict . Text.strip $ e
-  return . (: acc) $
+  pure . (: acc) $
     CachedUser
       pw
       User
@@ -103,4 +103,4 @@ toUser _ domain acc [i, e, p] = do
         }
 toUser g _ acc entry = do
   warn g $ msg (val "invalid entry: " +++ show entry)
-  return acc
+  pure acc

libs/api-bot/src/Network/Wire/Bot/Clients.hs

@@ -57,7 +57,7 @@ addMembers self c uu =
 -- TODO: Move / inline to Network.Wire.Bot.Crypto and remove this module
 foldSessions :: MonadIO m => Clients -> ConvId -> a -> (UserId -> ClientId -> Session -> a -> m a) -> m a
 foldSessions self c a f =
-  foldrM fun a =<< Map.findWithDefault Set.empty c <$> liftIO (readTVarIO (members self))
+  foldrM fun a . Map.findWithDefault Set.empty c =<< liftIO (readTVarIO (members self))
   where
     fun u acc1 = do
       cm <- Map.findWithDefault Map.empty u . clients <$> liftIO (readTVarIO (sessions self))
@@ -66,4 +66,4 @@ foldSessions self c a f =
 lookupSession :: MonadIO m => Clients -> UserId -> ClientId -> m (Maybe Session)
 lookupSession self u d = do
   s <- liftIO $ readTVarIO (sessions self)
-  return $ Map.lookup u (clients s) >>= Map.lookup d
+  pure $ Map.lookup u (clients s) >>= Map.lookup d

libs/api-bot/src/Network/Wire/Bot/Crypto.hs

@@ -95,7 +95,7 @@ clientInitSession cl uid = do
       k <- decodePrekey c
       let i = mkSID uid (prekeyClient c)
       s <- liftIO $ unwrap =<< CBox.sessionFromPrekey b i k
-      return (prekeyClient c, s)
+      pure (prekeyClient c, s)
 
 -- | Initialise an OTR session between the given 'BotClient' and the sender of
 -- the given OTR message.
@@ -116,12 +116,12 @@ encrypt cl cnv val = fmap (OtrRecipients . UserClientMap)
   . foldSessions (botClientSessions cl) cnv Map.empty
   $ \u c s rcps ->
     if botClientId cl == c
-      then return rcps
+      then pure rcps
       else liftIO $ do
         ciphertext <- do
           bs <- CBox.encrypt s val >>= unwrap >>= CBox.copyBytes
-          return $! decodeUtf8 $! B64.encode bs
-        return $ Map.insertWith Map.union u (Map.singleton c ciphertext) rcps
+          pure $! decodeUtf8 $! B64.encode bs
+        pure $ Map.insertWith Map.union u (Map.singleton c ciphertext) rcps
 
 -- | Decrypt an OTR message received from a given user and client.
 decrypt :: BotClient -> UserId -> ClientId -> ByteString -> BotSession ByteString
@@ -172,7 +172,7 @@ encryptSymmetric clt (SymmetricKeys ekey mkey) msg = liftIO $ do
   iv <- randomBytes (botClientBox clt) 16
   let ciphertext = iv <> cbcEncrypt aes (aesIV iv) (padPKCS7 msg)
   let mac = hmac (toByteString' mkey) ciphertext :: HMAC SHA256
-  return $ convert mac <> ciphertext
+  pure $ convert mac <> ciphertext
 
 decryptSymmetric :: MonadIO m => BotClient -> SymmetricKeys -> Ciphertext -> m Plaintext
 decryptSymmetric _ (SymmetricKeys ekey mkey) msg = liftIO $ do
@@ -184,7 +184,7 @@ decryptSymmetric _ (SymmetricKeys ekey mkey) msg = liftIO $ do
     throwM $
       RequirementFailed "Bad MAC"
   let (iv, dat) = BS.splitAt 16 ciphertext
-  return $ unpadPKCS7 $ cbcDecrypt aes (aesIV iv) dat
+  pure $ unpadPKCS7 $ cbcDecrypt aes (aesIV iv) dat
 
 -----------------------------------------------------------------------------
 -- Helpers

libs/api-bot/src/Network/Wire/Bot/Crypto/Glue.hs

@@ -1,5 +1,3 @@
-{-# LANGUAGE LambdaCase #-}
-
 -- This file is part of the Wire Server implementation.
 --
 -- Copyright (C) 2022 Wire Swiss GmbH <opensource@wire.com>
@@ -67,12 +65,12 @@ randomBytes :: MonadIO m => Box -> Word32 -> m ByteString
 randomBytes b n = liftIO $ CBox.randomBytes b n >>= unwrap >>= CBox.copyBytes
 
 unwrap :: (Show a, MonadThrow m) => CBox.Result a -> m a
-unwrap (CBox.Success a) = return a
+unwrap (CBox.Success a) = pure a
 unwrap other = throwM $ userError (show other)
 
 getBoxDir :: UserId -> Maybe Text -> IO FilePath
 getBoxDir uid label = do
   tmp <- getTemporaryDirectory
   let usrDir = show (toUUID uid)
   let cltDir = maybe "" Text.unpack label
-  return $ tmp </> "wire-bot" </> usrDir </> cltDir
+  pure $ tmp </> "wire-bot" </> usrDir </> cltDir

libs/api-bot/src/Network/Wire/Bot/Email.hs

@@ -78,7 +78,7 @@ instance Exception MailException
 loadMailboxConfig :: FilePath -> IO [Mailbox]
 loadMailboxConfig p = do
   cfg <- LB.readFile p
-  mbs <- either error return (eitherDecode' cfg) :: IO [MailboxSettings]
+  mbs <- either error pure (eitherDecode' cfg) :: IO [MailboxSettings]
   mapM newMailbox mbs
 
 newMailbox :: MailboxSettings -> IO Mailbox
@@ -88,7 +88,7 @@ newMailbox s@(MailboxSettings host usr pwd conns) =
     connect = do
       c <- connectIMAPSSLWithSettings host defaultSettingsIMAPSSL
       login c (show usr) pwd
-      return c
+      pure c
 
 -- | Awaits activation e-mail to arrive at a mailbox with
 -- the designated recipient address.
@@ -109,7 +109,7 @@ awaitActivationMail mbox folders from to = do
     let codeHdr = find ((== "x-zeta-code") . paramName) hdrs
     case liftM2 (,) keyHdr codeHdr of
       Just (k, c) ->
-        return $
+        pure $
           ( ActivationKey $ Ascii.unsafeFromText $ paramValue k,
             ActivationCode $ Ascii.unsafeFromText $ paramValue c
           )
@@ -132,7 +132,7 @@ awaitPasswordResetMail mbox folders from to = do
     let codeHdr = find ((== "x-zeta-code") . paramName) hdrs
     case liftM2 (,) keyHdr codeHdr of
       Just (k, c) ->
-        return $
+        pure $
           ( PasswordResetKey $ Ascii.unsafeFromText $ paramValue k,
             PasswordResetCode $ Ascii.unsafeFromText $ paramValue c
           )
@@ -153,7 +153,7 @@ awaitInvitationMail mbox folders from to = do
     let hdrs = mime_val_headers msg
     let invHdr = find ((== "x-zeta-code") . paramName) hdrs
     case invHdr of
-      Just i -> return . read . T.unpack $ paramValue i
+      Just i -> pure . read . T.unpack $ paramValue i
       Nothing -> throwIO MissingEmailHeaders
 
 awaitMail ::
@@ -176,7 +176,7 @@ awaitMail mbox folders from to purpose = go 0
       case msgs of
         [] | t >= timeout -> throwIO EmailTimeout
         [] -> threadDelay sleep >> go (t + sleep)
-        (m : ms) -> return (m :| ms)
+        (m : ms) -> pure (m :| ms)
 
 fetchMail ::
   Mailbox ->
@@ -192,7 +192,7 @@ fetchMail ::
 fetchMail mbox folders from to purpose = withResource (mailboxPool mbox) $ \c -> do
   msgIds <- concat <$> forM folders (searchMail c)
   msgs <- mapM (fetch c) msgIds
-  return $ map (parseMIMEMessage . T.decodeLatin1) msgs
+  pure $ map (parseMIMEMessage . T.decodeLatin1) msgs
   where
     searchMail c folder = do
       select c folder