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// Copyright (c) 2015 Mattermost, Inc. All Rights Reserved.
// See License.txt for license information.
package app
import (
"fmt"
"time"
"github.com/mattermost/platform/einterfaces"
"github.com/mattermost/platform/model"
"github.com/mattermost/platform/utils"
l4g "github.com/alecthomas/log4go"
"github.com/gorilla/websocket"
goi18n "github.com/nicksnyder/go-i18n/i18n"
)
const (
WRITE_WAIT = 30 * time.Second
PONG_WAIT = 100 * time.Second
PING_PERIOD = (PONG_WAIT * 6) / 10
AUTH_TIMEOUT = 5 * time.Second
)
type WebConn struct {
WebSocket *websocket.Conn
Send chan model.WebSocketMessage
SessionToken string
SessionExpiresAt int64
UserId string
T goi18n.TranslateFunc
Locale string
AllChannelMembers map[string]string
LastAllChannelMembersTime int64
}
func NewWebConn(ws *websocket.Conn, session model.Session, t goi18n.TranslateFunc, locale string) *WebConn {
if len(session.UserId) > 0 {
go SetStatusOnline(session.UserId, session.Id, false)
}
return &WebConn{
Send: make(chan model.WebSocketMessage, 256),
WebSocket: ws,
UserId: session.UserId,
SessionToken: session.Token,
SessionExpiresAt: session.ExpiresAt,
T: t,
Locale: locale,
}
}
func (c *WebConn) ReadPump() {
defer func() {
HubUnregister(c)
c.WebSocket.Close()
}()
c.WebSocket.SetReadLimit(model.SOCKET_MAX_MESSAGE_SIZE_KB)
c.WebSocket.SetReadDeadline(time.Now().Add(PONG_WAIT))
c.WebSocket.SetPongHandler(func(string) error {
c.WebSocket.SetReadDeadline(time.Now().Add(PONG_WAIT))
if c.IsAuthenticated() {
go SetStatusAwayIfNeeded(c.UserId, false)
}
return nil
})
for {
var req model.WebSocketRequest
if err := c.WebSocket.ReadJSON(&req); err != nil {
// browsers will appear as CloseNoStatusReceived
if websocket.IsCloseError(err, websocket.CloseNormalClosure, websocket.CloseNoStatusReceived) {
l4g.Debug(fmt.Sprintf("websocket.read: client side closed socket userId=%v", c.UserId))
} else {
l4g.Debug(fmt.Sprintf("websocket.read: closing websocket for userId=%v error=%v", c.UserId, err.Error()))
}
return
} else {
Srv.WebSocketRouter.ServeWebSocket(c, &req)
}
}
}
func (c *WebConn) WritePump() {
ticker := time.NewTicker(PING_PERIOD)
authTicker := time.NewTicker(AUTH_TIMEOUT)
defer func() {
ticker.Stop()
authTicker.Stop()
c.WebSocket.Close()
}()
for {
select {
case msg, ok := <-c.Send:
if !ok {
c.WebSocket.SetWriteDeadline(time.Now().Add(WRITE_WAIT))
c.WebSocket.WriteMessage(websocket.CloseMessage, []byte{})
return
}
c.WebSocket.SetWriteDeadline(time.Now().Add(WRITE_WAIT))
if err := c.WebSocket.WriteMessage(websocket.TextMessage, msg.GetPreComputeJson()); err != nil {
// browsers will appear as CloseNoStatusReceived
if websocket.IsCloseError(err, websocket.CloseNormalClosure, websocket.CloseNoStatusReceived) {
l4g.Debug(fmt.Sprintf("websocket.send: client side closed socket userId=%v", c.UserId))
} else {
l4g.Debug(fmt.Sprintf("websocket.send: closing websocket for userId=%v, error=%v", c.UserId, err.Error()))
}
return
}
if msg.EventType() == model.WEBSOCKET_EVENT_POSTED {
if einterfaces.GetMetricsInterface() != nil {
einterfaces.GetMetricsInterface().IncrementPostBroadcast()
}
}
case <-ticker.C:
c.WebSocket.SetWriteDeadline(time.Now().Add(WRITE_WAIT))
if err := c.WebSocket.WriteMessage(websocket.PingMessage, []byte{}); err != nil {
// browsers will appear as CloseNoStatusReceived
if websocket.IsCloseError(err, websocket.CloseNormalClosure, websocket.CloseNoStatusReceived) {
l4g.Debug(fmt.Sprintf("websocket.ticker: client side closed socket userId=%v", c.UserId))
} else {
l4g.Debug(fmt.Sprintf("websocket.ticker: closing websocket for userId=%v error=%v", c.UserId, err.Error()))
}
return
}
case <-authTicker.C:
if c.SessionToken == "" {
l4g.Debug(fmt.Sprintf("websocket.authTicker: did not authenticate ip=%v", c.WebSocket.RemoteAddr()))
return
}
authTicker.Stop()
}
}
}
func (webCon *WebConn) InvalidateCache() {
webCon.AllChannelMembers = nil
webCon.LastAllChannelMembersTime = 0
webCon.SessionExpiresAt = 0
}
func (webCon *WebConn) IsAuthenticated() bool {
// Check the expiry to see if we need to check for a new session
if webCon.SessionExpiresAt < model.GetMillis() {
if webCon.SessionToken == "" {
return false
}
session, err := GetSession(webCon.SessionToken)
if err != nil {
l4g.Error(utils.T("api.websocket.invalid_session.error"), err.Error())
webCon.SessionToken = ""
webCon.SessionExpiresAt = 0
return false
}
webCon.SessionToken = session.Token
webCon.SessionExpiresAt = session.ExpiresAt
}
return true
}
func (webCon *WebConn) SendHello() {
msg := model.NewWebSocketEvent(model.WEBSOCKET_EVENT_HELLO, "", "", webCon.UserId, nil)
msg.Add("server_version", fmt.Sprintf("%v.%v.%v", model.CurrentVersion, model.BuildNumber, utils.CfgHash))
msg.DoPreComputeJson()
webCon.Send <- msg
}
func (webCon *WebConn) ShouldSendEvent(msg *model.WebSocketEvent) bool {
// IMPORTANT: Do not send event if WebConn does not have a session
if !webCon.IsAuthenticated() {
return false
}
// If the event is destined to a specific user
if len(msg.Broadcast.UserId) > 0 && webCon.UserId != msg.Broadcast.UserId {
return false
}
// if the user is omitted don't send the message
if len(msg.Broadcast.OmitUsers) > 0 {
if _, ok := msg.Broadcast.OmitUsers[webCon.UserId]; ok {
return false
}
}
// Only report events to users who are in the channel for the event
if len(msg.Broadcast.ChannelId) > 0 {
// Only broadcast typing messages if less than 1K people in channel
if msg.Event == model.WEBSOCKET_EVENT_TYPING {
if Srv.Store.Channel().GetMemberCountFromCache(msg.Broadcast.ChannelId) > *utils.Cfg.TeamSettings.MaxNotificationsPerChannel {
return false
}
}
if model.GetMillis()-webCon.LastAllChannelMembersTime > 1000*60*15 { // 15 minutes
webCon.AllChannelMembers = nil
webCon.LastAllChannelMembersTime = 0
}
if webCon.AllChannelMembers == nil {
if result := <-Srv.Store.Channel().GetAllChannelMembersForUser(webCon.UserId, true); result.Err != nil {
l4g.Error("webhub.shouldSendEvent: " + result.Err.Error())
return false
} else {
webCon.AllChannelMembers = result.Data.(map[string]string)
webCon.LastAllChannelMembersTime = model.GetMillis()
}
}
if _, ok := webCon.AllChannelMembers[msg.Broadcast.ChannelId]; ok {
return true
} else {
return false
}
}
// Only report events to users who are in the team for the event
if len(msg.Broadcast.TeamId) > 0 {
return webCon.IsMemberOfTeam(msg.Broadcast.TeamId)
}
return true
}
func (webCon *WebConn) IsMemberOfTeam(teamId string) bool {
session, err := GetSession(webCon.SessionToken)
if err != nil {
l4g.Error(utils.T("api.websocket.invalid_session.error"), err.Error())
return false
} else {
member := session.GetTeamByTeamId(teamId)
if member != nil {
return true
} else {
return false
}
}
}
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