Bootstrapped my haskell client

haskell/src/SpaceTraders/APIClient/Agent.hs

@@ -0,0 +1,34 @@
+{-# LANGUAGE DeriveAnyClass #-}
+{-# LANGUAGE DeriveGeneric #-}
+{-# LANGUAGE OverloadedStrings #-}
+
+module SpaceTraders.APIClient.Agent
+  ( RegisterMessage(..)
+  , myAgent
+  , register
+  ) where
+
+import Data.Aeson
+import GHC.Generics
+import qualified Data.Text as T
+import Network.HTTP.Simple
+
+import SpaceTraders.APIClient.Client
+import SpaceTraders.Model.Agent
+
+myAgent :: T.Text -> IO (Either APIError Agent)
+myAgent t = send $ setRequestPath "/v2/my/agent"
+                 $ tokenReq t
+
+data RegisterRequest = RegisterRequest { symbol :: T.Text
+                                       , faction :: T.Text
+                                       } deriving (ToJSON, Generic, Show)
+data RegisterMessage = RegisterMessage { token :: T.Text
+                                       , agent :: Agent
+                                       } deriving (FromJSON, Generic, Show)
+
+register :: T.Text -> T.Text -> IO (Either APIError RegisterMessage)
+register s f = send $ setRequestPath "/v2/register"
+                    $ setRequestMethod "POST"
+                    $ setRequestBodyJSON RegisterRequest{symbol = s, faction = f}
+                    $ defaultReq

haskell/src/SpaceTraders/APIClient/Client.hs

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+{-# LANGUAGE OverloadedStrings #-}
+
+module SpaceTraders.APIClient.Client
+  ( APIError(..)
+  , APIMessage(..)
+  , defaultReq
+  , fromJSONValue
+  , send
+  , tokenReq
+  ) where
+
+import Control.Exception
+import Control.Monad
+import Data.Aeson
+import Data.Aeson.Types
+import qualified Data.Text as T
+import qualified Data.Text.Encoding as T
+import Network.HTTP.Simple
+import Network.HTTP.Types.Status
+
+data APIError = APIError { apiErrorCode :: Int
+                         , apiErrorMessage :: T.Text
+                         } deriving Show
+instance Exception APIError
+instance FromJSON APIError where
+  parseJSON (Object o) = do
+    e <- o .: "error"
+    APIError <$> e .: "code"
+             <*> e .: "message"
+  parseJSON _ = mzero
+
+data APIMessage = APIMessage { data_ :: Value } deriving (Show)
+instance FromJSON APIMessage where
+  parseJSON (Object o) = APIMessage <$> o .: "data"
+  parseJSON _ = mzero
+
+defaultReq :: Request
+defaultReq = setRequestHost "api.spacetraders.io"
+           $ setRequestPort 443
+           $ setRequestSecure True
+           $ setRequestHeader "Content-Type" ["application/json"]
+           $ defaultRequest
+
+tokenReq :: T.Text -> Request
+tokenReq token = setRequestHeader "Authorization" [T.encodeUtf8 $ "Bearer " <> token]
+               $ defaultReq
+
+fromJSONValue :: FromJSON a => Value -> Either String a
+fromJSONValue = parseEither parseJSON
+
+send :: FromJSON a => Request -> IO (Either APIError a)
+send request = do
+  response <- httpLbs request
+  let status = statusCode $ getResponseStatus response
+      body = getResponseBody response
+  if status >= 200 && status <= 299
+    then case eitherDecode body of
+      Left e -> return $ Left APIError{apiErrorCode = -1000, apiErrorMessage = T.pack $ concat ["Error decoding JSON APIMessage: ", e]}
+      Right r -> case fromJSONValue (data_ r) of
+        Left e -> return $ Left APIError{apiErrorCode = -1001, apiErrorMessage = T.pack $ concat ["Error decoding JSON message contents: ", e]}
+        Right m -> return $ Right m
+    else case eitherDecode body of
+      Left e -> return $ Left APIError{apiErrorCode = -status, apiErrorMessage = T.pack $ concat ["Error decoding JSON APIError: ", e, ". Got HTTP body: ", show body]}
+      Right e -> return $ Left e
+
+--handleAPIError :: SomeException -> IO (Maybe RegisterMessage)
+--handleAPIError e = do
+--  print e
+--  return Nothing