More granular error responses

server/errors.js

@@ -1,9 +1,28 @@
 // @flow
 import httpErrors from 'http-errors';
 
-const apiError = (code: number, id: string, message: string) => {
-  return httpErrors(code, message, { id });
-};
+export function ValidationError(message: string = 'Validation failed') {
+  return httpErrors(400, message, { id: 'validation_error' });
+}
 
-export default apiError;
-export { httpErrors };
+export function ParamRequiredError(
+  message: string = 'Required parameter missing'
+) {
+  return httpErrors(400, message, { id: 'param_required' });
+}
+
+export function AuthorizationError(
+  message: string = 'You do not have permission to access this resource'
+) {
+  return httpErrors(403, message, { id: 'permission_required' });
+}
+
+export function AdminRequiredError(
+  message: string = 'An admin role is required to access this resource'
+) {
+  return httpErrors(403, message, { id: 'admin_required' });
+}
+
+export function NotFoundError(message: string = 'Resource not found') {
+  return httpErrors(404, message, { id: 'not_found' });
+}