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+module Minilang.OpenApi where
+
+import Control.Lens ((&), (.~), (?~))
+import Data.Swagger
+  ( HasDescription (description),
+    HasInfo (info),
+    HasLicense (license),
+    HasTitle (title),
+    HasType (type_),
+    HasVersion (version),
+    NamedSchema (NamedSchema),
+    Swagger,
+    SwaggerType (SwaggerString),
+    ToParamSchema (..),
+    ToSchema (..),
+  )
+import Minilang.API (Challenge, Score, Token, User, lambdaAPI)
+import Servant.Swagger (HasSwagger (toSwagger))
+
+instance ToSchema Token where
+  declareNamedSchema _ =
+    return $
+      NamedSchema (Just "Token") $
+        mempty
+          & description ?~ "A hex-encoded bytestring."
+          & type_ ?~ SwaggerString
+
+instance ToSchema User where
+  declareNamedSchema _ =
+    return $
+      NamedSchema (Just "User") $
+        mempty
+          & description ?~ "A user name."
+          & type_ ?~ SwaggerString
+
+instance ToSchema Score
+
+instance ToSchema Challenge
+
+instance ToParamSchema Token where
+  toParamSchema _ = mempty & type_ ?~ SwaggerString
+
+lambdaSwagger :: Swagger
+lambdaSwagger =
+  toSwagger lambdaAPI
+    & info . title .~ "λ-Calculus Challenge API"
+    & info . version .~ "0.1"
+    & info . description ?~ "An API for learning and experimenting with the λ-calculus one challenge at a time"
+    & info . license ?~ "© Arnaud Bailly - All Rights Reserved"