Handle content requests with overly long filenames

no issue

- a request for a filename longer than those allowed by the filesystem produced a ENAMETOOLONG error, which would end up becoming a 500 error from Ghost
- this catches the error and returns a HTTP 400 Bad Request response

core/server/adapters/storage/LocalFileStorage.js

@@ -171,6 +171,10 @@ class LocalFileStore extends StorageBase {
                         }));
                     }
 
+                    if (err.code === 'ENAMETOOLONG') {
+                        return reject(new common.errors.BadRequestError({err: err}));
+                    }
+
                     return reject(new common.errors.GhostError({
                         err: err,
                         message: common.i18n.t('errors.errors.cannotReadImage', {img: options.path})