Move cors things to Main

src/Main.hs

@@ -66,3 +66,22 @@ main = do
   where
     describe = progDesc "create a REST API to an existing Postgres database"
     prettyVersion = intercalate "." $ map show $ versionBranch version
+
+
+defaultCorsPolicy :: CorsResourcePolicy
+defaultCorsPolicy =  CorsResourcePolicy Nothing
+  ["GET", "POST", "PUT", "PATCH", "DELETE", "OPTIONS"] ["Authorization"] Nothing
+  (Just $ 60*60*24) False False True
+
+corsPolicy :: Request -> Maybe CorsResourcePolicy
+corsPolicy req = case lookup "origin" headers of
+  Just origin -> Just defaultCorsPolicy {
+      corsOrigins = Just ([origin], True)
+    , corsRequestHeaders = "Authentication":accHeaders
+    }
+  Nothing -> Nothing
+  where
+    headers = requestHeaders req
+    accHeaders = case lookup "access-control-request-headers" headers of
+      Just hdrs -> map (CI.mk . cs . strip . cs) $ BS.split ',' hdrs
+      Nothing -> []