PLT-5012 Combine updateLastViewedAt, setLastViewedAt and setActiveChannel into a single API (#4840)

* Combine updateLastViewedAt, setLastViewedAt and setActiveChannel into a single API

* Remove preference DB writes

api/deprecated.go

@@ -7,6 +7,7 @@ import (
 	"net/http"
 
 	l4g "github.com/alecthomas/log4go"
+	"github.com/gorilla/mux"
 	"github.com/mattermost/platform/model"
 	"github.com/mattermost/platform/utils"
 )
@@ -16,7 +17,15 @@ import (
 func InitDeprecated() {
 	l4g.Debug(utils.T("api.channel.init.debug"))
 
-	BaseRoutes.Channels.Handle("/more", ApiUserRequired(getMoreChannels)).Methods("GET") // SCHEDULED FOR DEPRECATION IN 3.7
+	/* start - SCHEDULED FOR DEPRECATION IN 3.7 */
+	BaseRoutes.Channels.Handle("/more", ApiUserRequired(getMoreChannels)).Methods("GET")
+	/* end - SCHEDULED FOR DEPRECATION IN 3.7 */
+
+	/* start - SCHEDULED FOR DEPRECATION IN 3.8 */
+	BaseRoutes.NeedChannel.Handle("/update_last_viewed_at", ApiUserRequired(updateLastViewedAt)).Methods("POST")
+	BaseRoutes.NeedChannel.Handle("/set_last_viewed_at", ApiUserRequired(setLastViewedAt)).Methods("POST")
+	BaseRoutes.Users.Handle("/status/set_active_channel", ApiUserRequired(setActiveChannel)).Methods("POST")
+	/* end - SCHEDULED FOR DEPRECATION IN 3.8 */
 }
 
 func getMoreChannels(c *Context, w http.ResponseWriter, r *http.Request) {
@@ -37,3 +46,118 @@ func getMoreChannels(c *Context, w http.ResponseWriter, r *http.Request) {
 		w.Write([]byte(data.ToJson()))
 	}
 }
+
+func updateLastViewedAt(c *Context, w http.ResponseWriter, r *http.Request) {
+	params := mux.Vars(r)
+	id := params["channel_id"]
+
+	data := model.StringInterfaceFromJson(r.Body)
+
+	var active bool
+	var ok bool
+	if active, ok = data["active"].(bool); !ok {
+		active = true
+	}
+
+	doClearPush := false
+	if *utils.Cfg.EmailSettings.SendPushNotifications && !c.Session.IsMobileApp() && active {
+		if result := <-Srv.Store.User().GetUnreadCountForChannel(c.Session.UserId, id); result.Err != nil {
+			l4g.Error(utils.T("api.channel.update_last_viewed_at.get_unread_count_for_channel.error"), c.Session.UserId, id, result.Err.Error())
+		} else {
+			if result.Data.(int64) > 0 {
+				doClearPush = true
+			}
+		}
+	}
+
+	go func() {
+		if err := SetActiveChannel(c.Session.UserId, id); err != nil {
+			l4g.Error(err.Error())
+		}
+	}()
+
+	Srv.Store.Channel().UpdateLastViewedAt(id, c.Session.UserId)
+
+	// Must be after update so that unread count is correct
+	if doClearPush {
+		go clearPushNotification(c.Session.UserId, id)
+	}
+
+	chanPref := model.Preference{
+		UserId:   c.Session.UserId,
+		Category: c.TeamId,
+		Name:     model.PREFERENCE_NAME_LAST_CHANNEL,
+		Value:    id,
+	}
+
+	teamPref := model.Preference{
+		UserId:   c.Session.UserId,
+		Category: model.PREFERENCE_CATEGORY_LAST,
+		Name:     model.PREFERENCE_NAME_LAST_TEAM,
+		Value:    c.TeamId,
+	}
+
+	Srv.Store.Preference().Save(&model.Preferences{teamPref, chanPref})
+
+	message := model.NewWebSocketEvent(model.WEBSOCKET_EVENT_CHANNEL_VIEWED, c.TeamId, "", c.Session.UserId, nil)
+	message.Add("channel_id", id)
+
+	go Publish(message)
+
+	result := make(map[string]string)
+	result["id"] = id
+	w.Write([]byte(model.MapToJson(result)))
+}
+
+func setLastViewedAt(c *Context, w http.ResponseWriter, r *http.Request) {
+	params := mux.Vars(r)
+	id := params["channel_id"]
+
+	data := model.StringInterfaceFromJson(r.Body)
+	newLastViewedAt := int64(data["last_viewed_at"].(float64))
+
+	Srv.Store.Channel().SetLastViewedAt(id, c.Session.UserId, newLastViewedAt)
+
+	chanPref := model.Preference{
+		UserId:   c.Session.UserId,
+		Category: c.TeamId,
+		Name:     model.PREFERENCE_NAME_LAST_CHANNEL,
+		Value:    id,
+	}
+
+	teamPref := model.Preference{
+		UserId:   c.Session.UserId,
+		Category: model.PREFERENCE_CATEGORY_LAST,
+		Name:     model.PREFERENCE_NAME_LAST_TEAM,
+		Value:    c.TeamId,
+	}
+
+	Srv.Store.Preference().Save(&model.Preferences{teamPref, chanPref})
+
+	message := model.NewWebSocketEvent(model.WEBSOCKET_EVENT_CHANNEL_VIEWED, c.TeamId, "", c.Session.UserId, nil)
+	message.Add("channel_id", id)
+
+	go Publish(message)
+
+	result := make(map[string]string)
+	result["id"] = id
+	w.Write([]byte(model.MapToJson(result)))
+}
+
+func setActiveChannel(c *Context, w http.ResponseWriter, r *http.Request) {
+	data := model.MapFromJson(r.Body)
+
+	var channelId string
+	var ok bool
+	if channelId, ok = data["channel_id"]; !ok || len(channelId) > 26 {
+		c.SetInvalidParam("setActiveChannel", "channel_id")
+		return
+	}
+
+	if err := SetActiveChannel(c.Session.UserId, channelId); err != nil {
+		c.Err = err
+		return
+	}
+
+	ReturnStatusOK(w)
+}