photoprism/internal/api/websocket.go

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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.*", "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)
})
}