From 78003fdc7d427d6010a357ef1cad5452086126bf Mon Sep 17 00:00:00 2001
From: Juliusz Chroboczek <jch@irif.fr>
Date: Sat, 25 Apr 2020 19:59:53 +0200
Subject: [PATCH] Disallow usernames with spaces.

---
 client.go | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/client.go b/client.go
index f5f90c5..9a31da4 100644
--- a/client.go
+++ b/client.go
@@ -12,6 +12,7 @@ import (
 	"log"
 	"math"
 	"os"
+	"strings"
 	"sync"
 	"sync/atomic"
 	"time"
@@ -151,6 +152,11 @@ func startClient(conn *websocket.Conn) (err error) {
 	c.writerDone = make(chan struct{})
 	go clientWriter(conn, c.writeCh, c.writerDone)
 
+	if strings.ContainsRune(m.Username, ' ') {
+		err = userError("don't put spaces in your username")
+		return
+	}
+
 	g, users, err := addClient(m.Group, c, m.Username, m.Password)
 	if err != nil {
 		return