Improve error handling on join failure.

Solves the issue of groups with a name ending in "/".

group/group.go

@@ -159,6 +159,10 @@ func (g *Group) API() *webrtc.API {
 }
 
 func Add(name string, desc *description) (*Group, error) {
+	if name == "" || strings.HasSuffix(name, "/") {
+		return nil, UserError("illegal group name")
+	}
+
 	groups.mu.Lock()
 	defer groups.mu.Unlock()
 

rtpconn/webclient.go

@@ -3,11 +3,11 @@ package rtpconn
 import (
 	"encoding/json"
 	"errors"
+	"fmt"
 	"log"
 	"os"
 	"sync"
 	"time"
-	"fmt"
 
 	"github.com/gorilla/websocket"
 	"github.com/pion/webrtc/v3"
@@ -1031,13 +1031,18 @@ func handleClientMessage(c *webClient, m clientMessage) error {
 		c.password = m.Password
 		g, err := group.AddClient(m.Group, c)
 		if err != nil {
+			var s string
 			if os.IsNotExist(err) {
-				return c.error(
-					group.UserError("group does not exist"),
-				)
+				s = "group does not exist"
 			} else if err == group.ErrNotAuthorised {
+				s = "not authorised"
 				time.Sleep(200 * time.Millisecond)
-				s := "not authorised"
+			} else if e, ok := err.(group.UserError); ok {
+				s = string(e)
+			} else {
+				s = "internal server error"
+				log.Printf("Join group: %v")
+			}
 			return c.write(clientMessage{
 				Type:        "joined",
 				Kind:        "fail",
@@ -1046,14 +1051,16 @@ func handleClientMessage(c *webClient, m clientMessage) error {
 				Value:       &s,
 			})
 		}
-			return err
-		}
 		if redirect := g.Redirect(); redirect != "" {
 			// We normally redirect at the HTTP level, but the group
 			// description could have been edited in the meantime.
-			return c.error(
-				group.UserError("group is now at " + redirect),
-			)
+			return c.write(clientMessage{
+				Type:        "joined",
+				Kind:        "redirect",
+				Group:       m.Group,
+				Permissions: &group.ClientPermissions{},
+				Value:       &redirect,
+			})
 		}
 		c.group = g
 		perms := c.permissions

static/sfu.js

@@ -271,7 +271,7 @@ function setConnected(connected) {
             userpass ? userpass.password : '';
         userbox.classList.add('invisible');
         connectionbox.classList.remove('invisible');
-        displayError("Disconnected!", "error");
+        displayError('Disconnected', 'error');
         hideVideo();
         closeVideoControls();
     }
@@ -1425,25 +1425,39 @@ let presentRequested = null;
  * @param {Object<string,boolean>} perms
  */
 async function gotJoined(kind, group, perms, message) {
-    if(kind === 'fail') {
+    let present = presentRequested;
+    presentRequested = null;
+
+    switch(kind) {
+    case 'fail':
         displayError('The server said: ' + message);
         this.close();
         return;
+    case 'redirect':
+        this.close();
+        document.location = message;
+        return;
+    case 'leave':
+        this.close();
+        return;
+    case 'join':
+        break;
+    default:
+        displayError('Unknown join message');
+        this.close();
+        return;
     }
 
     displayUsername();
     setButtonsVisibility();
 
-    if(kind !== 'leave')
     this.request(getSettings().request);
 
-    try {
-        if(kind === 'join' &&
-           serverConnection.permissions.present && !findUpMedia('local')) {
-            if(presentRequested) {
-                if(presentRequested === 'mike')
+    if(serverConnection.permissions.present && !findUpMedia('local')) {
+        if(present) {
+            if(present === 'mike')
                 updateSettings({video: ''});
-                else if(presentRequested === 'both')
+            else if(present === 'both')
                 delSetting('video');
             reflectSettings();
 
@@ -1456,13 +1470,10 @@ async function gotJoined(kind, group, perms, message) {
             }
         } else {
             displayMessage(
-                    "Press Present to enable your camera or microphone"
+                "Press Ready to enable your camera or microphone"
             );
         }
     }
-    } finally {
-        presentRequested = null;
-    }
 }
 
 const urlRegexp = /https?:\/\/[-a-zA-Z0-9@:%/._\\+~#&()=?]+[-a-zA-Z0-9@:%/_\\+~#&()=]/g;

webserver/webserver.go

@@ -243,6 +243,12 @@ func groupHandler(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	if strings.HasSuffix(r.URL.Path, "/") {
+		http.Redirect(w, r, r.URL.Path[:len(r.URL.Path)-1],
+			http.StatusPermanentRedirect)
+		return
+	}
+
 	g, err := group.Add(name, nil)
 	if err != nil {
 		if os.IsNotExist(err) {