From 12858e1f365d2febffc9f017628ba493ceffd3c3 Mon Sep 17 00:00:00 2001
From: Juliusz Chroboczek <jch@irif.fr>
Date: Mon, 18 May 2020 15:24:04 +0200
Subject: [PATCH] Implement commands /lock and /unlock.

---
 client.go     | 10 ++++++++++
 group.go      |  5 +++++
 static/sfu.js | 10 ++++++++++
 3 files changed, 25 insertions(+)

diff --git a/client.go b/client.go
index ce8d8ee..10dd469 100644
--- a/client.go
+++ b/client.go
@@ -1248,6 +1248,16 @@ func handleClientMessage(c *client, m clientMessage) error {
 		if err != nil {
 			return c.error(err)
 		}
+	case "lock", "unlock":
+		if !c.permissions.Op {
+			c.error(userError("not authorised"))
+			return nil
+		}
+		var locked uint32
+		if m.Type == "lock" {
+			locked = 1
+		}
+		atomic.StoreUint32(&c.group.locked, locked)
 	case "kick":
 		if !c.permissions.Op {
 			c.error(userError("not authorised"))
diff --git a/group.go b/group.go
index 70d568f..41ded51 100644
--- a/group.go
+++ b/group.go
@@ -199,6 +199,7 @@ type group struct {
 	dead        bool
 	description *groupDescription
 	videoCount  uint32
+	locked      uint32
 
 	mu      sync.Mutex
 	clients map[string]*client
@@ -366,6 +367,10 @@ func addClient(name string, client *client, user, pass string) (*group, []userid
 	}
 	client.permissions = perms
 
+	if !perms.Op && atomic.LoadUint32(&g.locked) != 0 {
+		return nil, nil, userError("group is locked")
+	}
+
 	g.mu.Lock()
 	defer g.mu.Unlock()
 
diff --git a/static/sfu.js b/static/sfu.js
index 12fe2ea..fa610b9 100644
--- a/static/sfu.js
+++ b/static/sfu.js
@@ -888,6 +888,16 @@ function handleInput() {
                     type: 'clearchat',
                 });
                 return;
+            case '/lock':
+            case '/unlock':
+                if(!permissions.op) {
+                    displayError("You're not an operator");
+                    return;
+                }
+                send({
+                    type: cmd === '/lock' ? 'lock' : 'unlock',
+                });
+                return;
             case '/op':
             case '/unop':
             case '/kick':