Add group permissions.

client.go

@@ -89,6 +89,7 @@ type clientMessage struct {
 	Id          string                     `json:"id,omitempty"`
 	Username    string                     `json:"username,omitempty"`
 	Password    string                     `json:"password,omitempty"`
+	Permissions userPermission             `json:"permissions,omitempty"`
 	Group       string                     `json:"group,omitempty"`
 	Value       string                     `json:"value,omitempty"`
 	Message     string                     `json:"message,omitempty"`
@@ -149,7 +150,7 @@ func startClient(conn *websocket.Conn) (err error) {
 	c.writerDone = make(chan struct{})
 	go clientWriter(conn, c.writeCh, c.writerDone)
 
-	g, users, err := addClient(m.Group, c)
+	g, users, err := addClient(m.Group, c, m.Username, m.Password)
 	if err != nil {
 		return
 	}
@@ -262,7 +263,7 @@ func addUpConn(c *client, id string) (*upConnection, error) {
 		clients := c.group.getClients(c)
 		for _, cc := range clients {
 			cc.action(addTrackAction{id, local, u, done})
-			if(done && u.label != "") {
+			if done && u.label != "" {
 				cc.action(addLabelAction{id, u.label})
 			}
 		}
@@ -389,7 +390,7 @@ func delDownConn(c *client, id string) {
 		log.Printf("Deleting unknown connection")
 		return
 	}
-	conn := c.down[id];
+	conn := c.down[id]
 	if conn == nil {
 		log.Printf("Deleting unknown connection")
 		return
@@ -667,6 +668,11 @@ func clientLoop(c *client, conn *websocket.Conn) error {
 
 	g := c.group
 
+	c.write(clientMessage{
+		Type:        "permissions",
+		Permissions: c.permissions,
+	})
+
 	for _, cc := range g.getClients(c) {
 		cc.action(pushTracksAction{c})
 	}
@@ -747,6 +753,9 @@ func clientLoop(c *client, conn *websocket.Conn) error {
 func handleClientMessage(c *client, m clientMessage) error {
 	switch m.Type {
 	case "offer":
+		if !c.permissions.Present {
+			return userError("not authorized")
+		}
 		if m.Offer == nil {
 			return protocolError("null offer")
 		}

group.go

@@ -6,7 +6,10 @@
 package main
 
 import (
+	"encoding/json"
 	"log"
+	"os"
+	"path/filepath"
 	"sync"
 
 	"github.com/pion/webrtc/v2"
@@ -37,6 +40,7 @@ type client struct {
 	group       *group
 	id          string
 	username    string
+	permissions userPermission
 	done        chan struct{}
 	writeCh     chan interface{}
 	writerDone  chan struct{}
@@ -47,7 +51,7 @@ type client struct {
 
 type group struct {
 	name        string
-	public bool
+	description *groupDescription
 
 	mu      sync.Mutex
 	clients []*client
@@ -102,8 +106,13 @@ func addGroup(name string) (*group, error) {
 	g := groups.groups[name]
 
 	if g == nil {
+		desc, err := getDescription(name)
+		if err != nil {
+			return nil, err
+		}
 		g = &group{
 			name:        name,
+			description: desc,
 		}
 		groups.groups[name] = g
 	}
@@ -130,12 +139,18 @@ type userid struct {
 	username string
 }
 
-func addClient(name string, client *client) (*group, []userid, error) {
+func addClient(name string, client *client, user, pass string) (*group, []userid, error) {
 	g, err := addGroup(name)
 	if err != nil {
 		return nil, nil, err
 	}
 
+	perms, err := getPermission(g.description, user, pass)
+	if err != nil {
+		return nil, nil, err
+	}
+	client.permissions = perms
+
 	var users []userid
 	g.mu.Lock()
 	defer g.mu.Unlock()
@@ -182,8 +197,8 @@ func (g *group) Range(f func(c *client) bool) {
 	defer g.mu.Unlock()
 	for _, c := range g.clients {
 		ok := f(c)
-		if(!ok){
-			break;
+		if !ok {
+			break
 		}
 	}
 }
@@ -218,6 +233,83 @@ func (c *client) action(m interface{}) error {
 	}
 }
 
+type groupUser struct {
+	Username string `json:"username,omitempty"`
+	Password string `json:"password,omitempty"`
+}
+
+func matchUser(user, pass string, users []groupUser) (bool, bool) {
+	for _, u := range users {
+		if (u.Username == "" || u.Username == user) {
+			return true, (u.Password == "" || u.Password == pass)
+		}
+	}
+	return false, false
+}
+
+type groupDescription struct {
+	Public         bool        `json:"public,omitempty"`
+	AllowAnonymous bool        `json:"allow-anonymous,omitempty"`
+	Admin          []groupUser `json:"admin,omitempty"`
+	Presenter      []groupUser `json:"presenter,omitempty"`
+	Other          []groupUser `json:"other,omitempty"`
+}
+
+func getDescription(name string) (*groupDescription, error) {
+	r, err := os.Open(filepath.Join(groupsDir, name+".json"))
+	if err != nil {
+		if os.IsNotExist(err) {
+			err = userError("group does not exist")
+		} else if os.IsPermission(err) {
+			err = userError("unauthorised")
+		}
+		return nil, err
+	}
+	defer r.Close()
+
+	var desc groupDescription
+	d := json.NewDecoder(r)
+	err = d.Decode(&desc)
+	if err != nil {
+		return nil, err
+	}
+	return &desc, nil
+}
+
+type userPermission struct {
+	Admin bool `json:"admin,omitempty"`
+	Present bool `json:"present,omitempty"`
+}
+
+func getPermission(desc *groupDescription, user, pass string) (userPermission, error) {
+	var p userPermission
+	if !desc.AllowAnonymous && user == "" {
+		return p, userError("anonymous users not allowed in this group")
+	}
+	if found, good := matchUser(user, pass, desc.Admin); found {
+		if good {
+			p.Admin = true
+			p.Present = true
+			return p, nil
+		}
+		return p, userError("not authorized")
+	}
+	if found, good := matchUser(user, pass, desc.Presenter); found {
+		if good {
+			p.Present = true
+			return p, nil
+		}
+		return p, userError("not authorized")
+	}
+	if found, good := matchUser(user, pass, desc.Other); found {
+		if good {
+			return p, nil
+		}
+		return p, userError("not authorized")
+	}
+	return p, userError("not authorized")
+}
+
 type publicGroup struct {
 	Name        string `json:"name"`
 	ClientCount int    `json:"clientCount"`
@@ -228,7 +320,7 @@ func getPublicGroups() []publicGroup {
 	groups.mu.Lock()
 	defer groups.mu.Unlock()
 	for _, g := range groups.groups {
-		if g.public {
+		if g.description.Public {
 			gs = append(gs, publicGroup{
 				Name:        g.name,
 				ClientCount: len(g.clients),

sfu.go

@@ -22,6 +22,7 @@ import (
 var httpAddr string
 var staticRoot string
 var dataDir string
+var groupsDir string
 var iceFilename string
 
 func main() {
@@ -30,6 +31,8 @@ func main() {
 		"web server root `directory`")
 	flag.StringVar(&dataDir, "data", "./data/",
 		"data `directory`")
+	flag.StringVar(&groupsDir, "groups", "./groups/",
+		"group description `directory`")
 	flag.Parse()
 	iceFilename = filepath.Join(staticRoot, "ice-servers.json")
 

static/sfu.html

@@ -29,9 +29,9 @@
 
       <div id="optionsdiv">
         <label for="presenterbox">Present:</label>
-        <input id="presenterbox" type="checkbox"/>
+        <input id="presenterbox" type="checkbox"/ disabled>
         <label for="sharebox">Share screen:</label>
-        <input id="sharebox" type="checkbox"/>
+        <input id="sharebox" type="checkbox"/ disabled>
       </div>
     </div>
 

static/sfu.js

@@ -279,8 +279,10 @@ function serverConnect() {
         socket.onclose = function(e) {
             setConnected(false);
             document.getElementById('presenterbox').checked = false;
+            document.getElementById('presenterbox').disabled = true;
             setLocalMedia();
             document.getElementById('sharebox').checked = false;
+            document.getElementById('sharebox').disabled = true;
             setShareMedia();
             reject(new Error('websocket close ' + e.code + ' ' + e.reason));
         };
@@ -305,6 +307,9 @@ function serverConnect() {
             case 'label':
                 gotLabel(m.id, m.value);
                 break;
+            case 'permissions':
+                gotPermissions(m.permissions);
+                break;
             case 'user':
                 gotUser(m.id, m.username, m.del);
                 break;
@@ -483,6 +488,11 @@ function gotUser(id, name, del) {
         addUser(id, name);
 }
 
+function gotPermissions(permissions) {
+    document.getElementById('presenterbox').disabled = !permissions.present;
+    document.getElementById('sharebox').disabled = !permissions.present;
+}
+
 const urlRegexp = /https?:\/\/[-a-zA-Z0-9@:%/._\+~#=?]+[-a-zA-Z0-9@:%/_\+~#=]/g;
 
 function formatLine(line) {