From f221c38f2c6c5f99d2e88821cba63cebc7a04221 Mon Sep 17 00:00:00 2001
From: Ben Sima <ben@bsima.me>
Date: Mon, 22 Jan 2018 22:15:24 -0800
Subject: Standardize errors

---
 main.hs | 21 +++++++++++++++++----
 1 file changed, 17 insertions(+), 4 deletions(-)

diff --git a/main.hs b/main.hs
index dc1d440..966ea96 100755
--- a/main.hs
+++ b/main.hs
@@ -19,10 +19,11 @@
 {-# LANGUAGE TypeFamilies #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 
+import Data.Semigroup
 import GHC.Generics
 import Control.Monad
 import Data.Maybe (isJust)
-import Data.Text (Text, unpack)
+import Data.Text
 import Yesod
 import Network.HTTP.Types.Status (status400, status200)
 import Data.Aeson
@@ -50,6 +51,13 @@ data Caller = Caller
   }
   deriving (Show, Eq, Generic, ToJSON, FromJSON)
 
+
+-- | Standardize errors.
+data ApiError = ApiError
+  { msg :: Text
+  }
+  deriving (Show, Eq, Generic, ToJSON, FromJSON)
+
 -- FIXME
 findByNumber = id
 
@@ -57,7 +65,9 @@ getQueryR :: Handler RepJson
 getQueryR = do
   qm <- lookupGetParam "number"
   case qm of
-    Nothing -> notFound
+    Nothing ->
+      sendStatusJSON status400 $ (ApiError "Invalid request. Could not parse 'number' parameter.")
+
     Just q ->
       sendStatusJSON status200 $ object [ "msg" .= ("FIXME" :: Text) ]
 
@@ -66,5 +76,8 @@ postNumberR :: Handler RepJson
 postNumberR = do
   (obj :: Result Value) <- parseJsonBody
   case obj of
-    Error err -> sendStatusJSON status400 $ object [ "msg" .= ("invalid body" :: Text) ]
-    Success v -> sendStatusJSON status200 $ object [ "msg" .= ("FIXME" :: Text) ]
+    Error err ->
+      sendStatusJSON status400 $ ApiError $ "Invalid request. Could not parse JSON body: " <> pack err
+
+    Success v ->
+      sendStatusJSON status200 $ object [ "msg" .= ("FIXME" :: Text) ]
-- 
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