fix error message for invalid username/password

server/errors.go

@@ -122,6 +122,7 @@ var (
 	errHTTPBadRequestTemplateInvalid                 = &errHTTP{40043, http.StatusBadRequest, "invalid request: could not parse template", "https://ntfy.sh/docs/publish/#message-templating", nil}
 	errHTTPBadRequestTemplateDisallowedFunctionCalls = &errHTTP{40044, http.StatusBadRequest, "invalid request: template contains disallowed function calls, e.g. template, call, or define", "https://ntfy.sh/docs/publish/#message-templating", nil}
 	errHTTPBadRequestTemplateExecuteFailed           = &errHTTP{40045, http.StatusBadRequest, "invalid request: template execution failed", "https://ntfy.sh/docs/publish/#message-templating", nil}
+	errHTTPBadRequestInvalidArgument                 = &errHTTP{40046, http.StatusBadRequest, "invalid request: invalid argument", "", nil}
 	errHTTPNotFound                                  = &errHTTP{40401, http.StatusNotFound, "page not found", "", nil}
 	errHTTPUnauthorized                              = &errHTTP{40101, http.StatusUnauthorized, "unauthorized", "https://ntfy.sh/docs/publish/#authentication", nil}
 	errHTTPForbidden                                 = &errHTTP{40301, http.StatusForbidden, "forbidden", "https://ntfy.sh/docs/publish/#authentication", nil}

server/server_account.go

@@ -37,7 +37,11 @@ func (s *Server) handleAccountCreate(w http.ResponseWriter, r *http.Request, v *
 	}
 	logvr(v, r).Tag(tagAccount).Field("user_name", newAccount.Username).Info("Creating user %s", newAccount.Username)
 	if err := s.userManager.AddUser(newAccount.Username, newAccount.Password, user.RoleUser); err != nil {
-		return err
+		if err.Error() == "invalid argument" {
+			return errHTTPBadRequestInvalidArgument
+		} else {
+			return err
+		}
 	}
 	v.AccountCreated()
 	return s.writeJSON(w, newSuccessResponse())