package api import ( "encoding/json" "net/http" "sync" "time" "github.com/gin-gonic/gin" "github.com/gorilla/websocket" "github.com/photoprism/photoprism/internal/config" "github.com/photoprism/photoprism/internal/event" "github.com/photoprism/photoprism/internal/service" "github.com/photoprism/photoprism/pkg/rnd" ) var wsConnection = websocket.Upgrader{ CheckOrigin: func(r *http.Request) bool { return true }, } var wsTimeout = 90 * time.Second type clientInfo struct { SessionToken string `json:"session"` JsHash string `json:"js"` CssHash string `json:"css"` Version string `json:"version"` } var wsAuth = struct { authenticated map[string]bool mutex sync.RWMutex }{authenticated: make(map[string]bool)} func wsReader(ws *websocket.Conn, writeMutex *sync.Mutex, connId string, conf *config.Config) { defer ws.Close() ws.SetReadLimit(512) ws.SetReadDeadline(time.Now().Add(wsTimeout)) ws.SetPongHandler(func(string) error { ws.SetReadDeadline(time.Now().Add(wsTimeout)); return nil }) for { _, m, err := ws.ReadMessage() if err != nil { break } log.Debugf("websocket: received %d bytes", len(m)) var info clientInfo if err := json.Unmarshal(m, &info); err != nil { log.Error(err) } else { if service.Session().Exists(info.SessionToken) { log.Debug("websocket: authenticated") wsAuth.mutex.Lock() wsAuth.authenticated[connId] = true wsAuth.mutex.Unlock() writeMutex.Lock() ws.SetWriteDeadline(time.Now().Add(30 * time.Second)) if err := ws.WriteJSON(gin.H{"event": "config.updated", "data": event.Data{"config": conf.ClientConfig()}}); err != nil { log.Error(err) } writeMutex.Unlock() } } } } func wsWriter(ws *websocket.Conn, writeMutex *sync.Mutex, connId string) { pingTicker := time.NewTicker(15 * time.Second) s := event.Subscribe( "log.*", "notify.*", "index.*", "upload.*", "import.*", "config.*", "count.*", "photos.*", "cameras.*", "lenses.*", "countries.*", "albums.*", "labels.*", "sync.*", ) defer func() { pingTicker.Stop() event.Unsubscribe(s) ws.Close() wsAuth.mutex.Lock() wsAuth.authenticated[connId] = false wsAuth.mutex.Unlock() }() for { select { case <-pingTicker.C: ws.SetWriteDeadline(time.Now().Add(30 * time.Second)) if err := ws.WriteMessage(websocket.PingMessage, []byte{}); err != nil { return } case msg := <-s.Receiver: wsAuth.mutex.RLock() auth := wsAuth.authenticated[connId] wsAuth.mutex.RUnlock() if auth { writeMutex.Lock() ws.SetWriteDeadline(time.Now().Add(30 * time.Second)) if err := ws.WriteJSON(gin.H{"event": msg.Name, "data": msg.Fields}); err != nil { writeMutex.Unlock() log.Debug(err) return } writeMutex.Unlock() } } } } // GET /api/v1/ws func Websocket(router *gin.RouterGroup, conf *config.Config) { if router == nil { log.Error("websocket: router is nil") return } if conf == nil { log.Error("websocket: conf is nil") return } router.GET("/ws", func(c *gin.Context) { w := c.Writer r := c.Request ws, err := wsConnection.Upgrade(w, r, nil) if err != nil { log.Error(err) return } var writeMutex sync.Mutex defer ws.Close() connId := rnd.UUID() if conf.Public() { wsAuth.mutex.Lock() wsAuth.authenticated[connId] = true wsAuth.mutex.Unlock() } log.Debug("websocket: connected") go wsWriter(ws, &writeMutex, connId) wsReader(ws, &writeMutex, connId, conf) }) }