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