Send user permissions to client.

We now maintain the user list in the serverConnection.

README.FRONTEND

@@ -47,10 +47,12 @@ from the server; the field `kind` indicates the kind of message.
 
 Once you have joined a group (see below), the remaining callbacks may
 trigger.  The `onuser` callback is used to indicate that a user has joined
-or left the current group.  The `onchat` callback indicates that a chat
-message has been posted to the group, and `onclearchat` indicates that the
-chat history has been cleared.  Finally, `ondownstream` is called when the
-server pushes a stream to the client; see the section below about streams.
+or left the current group, or that their attributes have changed; the
+user's state can be found in the `users` dictionary.  The `onchat`
+callback indicates that a chat message has been posted to the group, and
+`onclearchat` indicates that the chat history has been cleared.  Finally,
+`ondownstream` is called when the server pushes a stream to the client;
+see the section below about streams.
 
 You may now connect to the server.
 

README.PROTOCOL

@@ -115,9 +115,10 @@ users a `user` message:
 ```javascript
 {
     type: 'user',
-    kind: 'add' or 'delete',
+    kind: 'add' or 'change' or 'delete',
     id: id,
-    username: username
+    username: username,
+    permissions: permissions
 }
 ```
 

diskwriter/diskwriter.go

@@ -71,7 +71,7 @@ func (client *Client) Permissions() group.ClientPermissions {
 	return group.ClientPermissions{}
 }
 
-func (client *Client) PushClient(id, username string, add bool) error {
+func (client *Client) PushClient(id, username string, permissions group.ClientPermissions, kind string) error {
 	return nil
 }
 

group/client.go

@@ -100,6 +100,6 @@ type Client interface {
 	SetPermissions(ClientPermissions)
 	OverridePermissions(*Group) bool
 	PushConn(g *Group, id string, conn conn.Up, tracks []conn.UpTrack, replace string) error
-	PushClient(id, username string, add bool) error
+	PushClient(id, username string, permissions ClientPermissions, kind string) error
 	Kick(id, user, message string) error
 }

group/group.go

@@ -485,11 +485,13 @@ func AddClient(group string, c Client) (*Group, error) {
 	g.clients[c.Id()] = c
 	g.timestamp = time.Now()
 
+	id := c.Id()
 	u := c.Username()
-	c.PushClient(c.Id(), u, true)
+	p := c.Permissions()
+	c.PushClient(c.Id(), u, p, "add")
 	for _, cc := range clients {
-		c.PushClient(cc.Id(), cc.Username(), true)
-		cc.PushClient(c.Id(), u, true)
+		c.PushClient(cc.Id(), cc.Username(), cc.Permissions(), "add")
+		cc.PushClient(id, u, p, "add")
 	}
 
 	return g, nil
@@ -535,7 +537,7 @@ func DelClient(c Client) {
 
 	go func(clients []Client) {
 		for _, cc := range clients {
-			cc.PushClient(c.Id(), c.Username(), false)
+			cc.PushClient(c.Id(), c.Username(), c.Permissions(), "delete")
 		}
 	}(clients)
 

rtpconn/webclient.go

@@ -106,16 +106,13 @@ func (c *webClient) OverridePermissions(g *group.Group) bool {
 	return false
 }
 
-func (c *webClient) PushClient(id, username string, add bool) error {
-	kind := "add"
-	if !add {
-		kind = "delete"
-	}
+func (c *webClient) PushClient(id, username string, permissions group.ClientPermissions, kind string) error {
 	return c.write(clientMessage{
-		Type:     "user",
-		Kind:     kind,
-		Id:       id,
-		Username: username,
+		Type:        "user",
+		Kind:        kind,
+		Id:          id,
+		Username:    username,
+		Permissions: &permissions,
 	})
 }
 
@@ -989,6 +986,14 @@ func handleAction(c *webClient, a interface{}) error {
 				}
 			}
 		}
+		id := c.Id()
+		user := c.Username()
+		clients := g.GetClients(nil)
+		go func(clients []group.Client) {
+			for _, cc := range clients {
+				cc.PushClient(id, user, perms, "change")
+			}
+		}(clients)
 	case kickAction:
 		return group.KickError{
 			a.id, a.username, a.message,

static/galene.js

@@ -293,13 +293,11 @@ function setConnected(connected) {
     let userbox = document.getElementById('profile');
     let connectionbox = document.getElementById('login-container');
     if(connected) {
-        resetUsers();
         clearChat();
         userbox.classList.remove('invisible');
         connectionbox.classList.add('invisible');
         displayUsername();
     } else {
-        resetUsers();
         fillLogin();
         userbox.classList.add('invisible');
         connectionbox.classList.remove('invisible');
@@ -1654,9 +1652,6 @@ function resizePeers() {
     }
 }
 
-/** @type{Object<string,string>} */
-let users = {};
-
 /**
  * Lexicographic order, with case differences secondary.
  * @param{string} a
@@ -1683,9 +1678,6 @@ function stringCompare(a, b) {
 function addUser(id, name) {
     if(!name)
         name = null;
-    if(id in users)
-        throw new Error('Duplicate user id');
-    users[id] = name;
 
     let div = document.getElementById('users');
     let user = document.createElement('div');
@@ -1697,7 +1689,9 @@ function addUser(id, name) {
         let us = div.children;
         for(let i = 0; i < us.length; i++) {
             let child = us[i];
-            let childname = users[child.id.slice('user-'.length)] || null;
+            let childuser =
+                serverConnection.users[child.id.slice('user-'.length)] || null;
+            let childname = (childuser && childuser.username) || null;
             if(!childname || stringCompare(childname, name) > 0) {
                 div.insertBefore(user, child);
                 return;
@@ -1711,36 +1705,38 @@ function addUser(id, name) {
  * @param {string} id
  * @param {string} name
  */
-function delUser(id, name) {
-    if(!name)
-        name = null;
-    if(!(id in users))
-        throw new Error('Unknown user id');
-    if(users[id] !== name)
-        throw new Error('Inconsistent user name');
-    delete(users[id]);
-    let div = document.getElementById('users');
+function changeUser(id, name) {
     let user = document.getElementById('user-' + id);
-    div.removeChild(user);
+    if(!user) {
+        console.warn('Unknown user ' + id);
+        return;
+    }
+    user.textContent = name ? name : '(anon)';
 }
 
-function resetUsers() {
-    for(let id in users)
-        delUser(id, users[id]);
+/**
+ * @param {string} id
+ */
+function delUser(id) {
+    let div = document.getElementById('users');
+    let user = document.getElementById('user-' + id);
+    div.removeChild(user);
 }
 
 /**
  * @param {string} id
  * @param {string} kind
- * @param {string} name
  */
-function gotUser(id, kind, name) {
+function gotUser(id, kind) {
     switch(kind) {
     case 'add':
-        addUser(id, name);
+        addUser(id, serverConnection.users[id].username);
         break;
     case 'delete':
-        delUser(id, name);
+        delUser(id);
+        break;
+    case 'change':
+        changeUser(id, serverConnection.users[id].username);
         break;
     default:
         console.warn('Unknown user kind', kind);
@@ -1986,8 +1982,10 @@ function addToChatbox(peerId, dest, nick, time, privileged, kind, message) {
             let header = document.createElement('p');
             if(peerId || nick || dest) {
                 let user = document.createElement('span');
+                let u = serverConnection.users[dest];
+                let name = (u && u.username);
                 user.textContent = dest ?
-                    `${nick||'(anon)'} \u2192 ${users[dest]||'(anon)'}` :
+                    `${nick||'(anon)'} \u2192 ${name || '(anon)'}` :
                     (nick || '(anon)');
                 user.classList.add('message-user');
                 header.appendChild(user);
@@ -2246,11 +2244,12 @@ function parseCommand(line) {
  * @param {string} user
  */
 function findUserId(user) {
-    if(user in users)
+    if(user in serverConnection.users)
         return user;
 
-    for(let id in users) {
-        if(users[id] === user)
+    for(let id in serverConnection.users) {
+        let u = serverConnection.users[id];
+        if(u && u.username === user)
             return id;
     }
     return null;

static/protocol.js

@@ -60,6 +60,12 @@ function newLocalId() {
     return id;
 }
 
+/**
+ * @typedef {Object} user
+ * @property {string} username
+ * @property {Object<string,boolean>} permissions
+ */
+
 /**
  * ServerConnection encapsulates a websocket connection to the server and
  * all the associated streams.
@@ -81,8 +87,16 @@ function ServerConnection() {
     this.group = null;
     /**
      * The username we joined as.
+     *
+     * @type {string}
      */
     this.username = null;
+    /**
+     * The set of users in this group, including ourself.
+     *
+     * @type {Object<string,user>}
+     */
+    this.users = {};
     /**
      * The underlying websocket.
      *
@@ -136,9 +150,10 @@ function ServerConnection() {
      */
     this.onclose = null;
     /**
-     * onuser is called whenever a user is added or removed from the group
+     * onuser is called whenever a user in the group changes.  The users
+     * array has already been updated.
      *
-     * @type{(this: ServerConnection, id: string, kind: string, username: string) => void}
+     * @type{(this: ServerConnection, id: string, kind: string) => void}
      */
     this.onuser = null;
     /**
@@ -260,6 +275,11 @@ ServerConnection.prototype.connect = async function(url) {
                 let c = sc.down[id];
                 c.close();
             }
+            for(let id in sc.users) {
+                delete(sc.users[id]);
+                if(sc.onuser)
+                    sc.onuser.call(sc, id, 'delete');
+            }
             if(sc.group && sc.onjoined)
                 sc.onjoined.call(sc, 'leave', sc.group, {}, '');
             sc.group = null;
@@ -303,14 +323,51 @@ ServerConnection.prototype.connect = async function(url) {
                 sc.username = m.username;
                 sc.permissions = m.permissions || [];
                 sc.rtcConfiguration = m.rtcConfiguration || null;
+                if(m.kind == 'leave') {
+                    for(let id in sc.users) {
+                        delete(sc.users[id]);
+                        if(sc.onuser)
+                            sc.onuser.call(sc, id, 'delete');
+                    }
+                }
                 if(sc.onjoined)
                     sc.onjoined.call(sc, m.kind, m.group,
                                      m.permissions || {},
                                      m.value || null);
                 break;
             case 'user':
+                switch(m.kind) {
+                case 'add':
+                    if(m.id in sc.users)
+                        console.warn(`Duplicate user ${m.id} ${m.username}`);
+                    sc.users[m.id] = {
+                        username: m.username,
+                        permissions: m.permissions,
+                    };
+                    break;
+                case 'change':
+                    if(!(m.id in sc.users)) {
+                        console.warn(`Unknown user ${m.id} ${m.username}`);
+                        sc.users[m.id] = {
+                            username: m.username,
+                            permissions: m.permissions,
+                        };
+                    } else {
+                        sc.users[m.id].username = m.username;
+                        sc.users[m.id].permissions = m.permissions;
+                    }
+                    break;
+                case 'delete':
+                    if(!(m.id in sc.users))
+                        console.warn(`Unknown user ${m.id} ${m.username}`);
+                    delete(sc.users[m.id]);
+                    break;
+                default:
+                    console.warn(`Unknown user action ${m.kind}`);
+                    return;
+                }
                 if(sc.onuser)
-                    sc.onuser.call(sc, m.id, m.kind, m.username);
+                    sc.onuser.call(sc, m.id, m.kind);
                 break;
             case 'chat':
                 if(sc.onchat)