// Check if the type of the channel is presence
func (c *channel) IsPresence() bool {
return utils.IsPresenceChannel(c.ChannelID)
}
// Handle messages
//
// If there is an unrecoverable error then break the loop,
// otherwise just keep going.
func onMessage(conn *websocket.Conn, w http.ResponseWriter, r *http.Request, sessionID string, app *app) {
var event struct {
Event string `json:"event"`
}
for {
_, message, err := conn.ReadMessage()
if err != nil {
log.Errorf("%+v", err)
switch err {
case io.EOF:
onClose(sessionID, app)
default:
emitWSError(newGenericReconnectImmediatelyError(), conn)
}
break
}
if err := json.Unmarshal(message, &event); err != nil {
emitWSError(newGenericReconnectImmediatelyError(), conn)
break
}
log.Infof("websockets: Handling %s event", event.Event)
switch event.Event {
case "pusher:ping":
if err := conn.WriteJSON(newPongEvent()); err != nil {
emitWSError(newGenericReconnectImmediatelyError(), conn)
}
case "pusher:subscribe":
subscribeEvent := subscribeEvent{}
if err := json.Unmarshal(message, &subscribeEvent); err != nil {
emitWSError(newGenericReconnectImmediatelyError(), conn)
break
}
connection, err := app.FindConnection(sessionID)
if err != nil {
emitWSError(newGenericReconnectImmediatelyError(), conn)
break
}
channelName := strings.TrimSpace(subscribeEvent.Data.Channel)
if !utils.IsChannelNameValid(channelName) {
emitWSError(newGenericError(fmt.Sprintf("This channel name is not valid")), conn)
break
}
isPresence := utils.IsPresenceChannel(channelName)
isPrivate := utils.IsPrivateChannel(channelName)
if isPresence || isPrivate {
toSign := []string{connection.SocketID, channelName}
if isPresence {
toSign = append(toSign, subscribeEvent.Data.ChannelData)
}
expectedAuthKey := fmt.Sprintf("%s:%s", app.Key, utils.HashMAC([]byte(strings.Join(toSign, ":")), []byte(app.Secret)))
if subscribeEvent.Data.Auth != expectedAuthKey {
emitWSError(newGenericError(fmt.Sprintf("Auth value for subscription to %s is invalid", channelName)), conn)
continue
}
}
channel := app.FindOrCreateChannelByChannelID(channelName)
log.Info(subscribeEvent.Data.ChannelData)
if err := app.Subscribe(channel, connection, subscribeEvent.Data.ChannelData); err != nil {
emitWSError(newGenericReconnectImmediatelyError(), conn)
}
case "pusher:unsubscribe":
unsubscribeEvent := unsubscribeEvent{}
if err := json.Unmarshal(message, &unsubscribeEvent); err != nil {
emitWSError(newGenericReconnectImmediatelyError(), conn)
}
connection, err := app.FindConnection(sessionID)
if err != nil {
emitWSError(newGenericError(fmt.Sprintf("Could not find a connection with the id %s", sessionID)), conn)
}
channel, err := app.FindChannelByChannelID(unsubscribeEvent.Data.Channel)
if err != nil {
emitWSError(newGenericError(fmt.Sprintf("Could not find a channel with the id %s", unsubscribeEvent.Data.Channel)), conn)
}
if err := app.Unsubscribe(channel, connection); err != nil {
emitWSError(newGenericReconnectImmediatelyError(), conn)
break
}
default: // CLient Events ??
// see http://pusher.com/docs/client_api_guide/client_events#trigger-events
if strings.HasPrefix(event.Event, "client-") {
if !app.UserEvents {
emitWSError(newGenericError("To send client events, you must enable this feature in the Settings."), conn)
}
clientEvent := rawEvent{}
if err := json.Unmarshal(message, &clientEvent); err != nil {
log.Error(err)
emitWSError(newGenericReconnectImmediatelyError(), conn)
break
}
channel, err := app.FindChannelByChannelID(clientEvent.Channel)
if err != nil {
emitWSError(newGenericError(fmt.Sprintf("Could not find a channel with the id %s", clientEvent.Channel)), conn)
}
if !channel.IsPresenceOrPrivate() {
emitWSError(newGenericError("Client event rejected - only supported on private and presence channels"), conn)
break
}
if err := app.Publish(channel, clientEvent, sessionID); err != nil {
log.Error(err)
emitWSError(newGenericReconnectImmediatelyError(), conn)
break
}
}
} // switch
} // For
}