fixup: conditions in routesPOST

Author: Will Toozs

lib/s3routes/routes/routePOST.ts

@@ -58,13 +58,21 @@ export default function routePOST(
                     corsHeaders));
     }
 
-    if (objectKey === undefined) {
-        if (Object.keys(query).length > 0) {
-            return routesUtils.responseNoBody(errors.InvalidArgument
-                .customizeDescription("Query String Parameters not allowed on POST requests."), null,
-                response, 400, log);
+    // Handle objectKey and query string conditions
+    if (objectKey !== undefined) {
+        if (Object.keys(query).length === 0) {
+            return api.callPostObject('objectPost', request, response, log, (err, resHeaders) =>
+                routesUtils.responseNoBody(err, resHeaders, response, 204, log));
+        } else {
+            // If there's an objectKey and a query string but no match with the previous conditions
+            return routesUtils.responseNoBody(errors.MethodNotAllowed, null, response, 405, log);
         }
-        return api.callPostObject('objectPost', request, response, log, (err, resHeaders) => routesUtils.responseNoBody(err, resHeaders, response, 204, log));
+    }
+
+    // Handle invalid query string parameters
+    if (Object.keys(query).length > 0) {
+        return routesUtils.responseNoBody(errors.InvalidArgument
+            .customizeDescription("Query String Parameters not allowed on POST requests."), null, response, 400, log);
     }
 
     return routesUtils.responseNoBody(errors.NotImplemented, null, response,