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client.go
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client.go
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package ws
import (
"encoding/json"
"net/http"
"strconv"
"time"
"github.com/gorilla/websocket"
"github.com/patrickhener/goshs/cli"
"github.com/patrickhener/goshs/logger"
)
// Packet defines a packet struct
type Packet struct {
Type string `json:"type"`
Content json.RawMessage
}
// SendPacket represents a response package from server to browser
type SendPacket struct {
Type string `json:"type"`
Content string `json:"content"`
}
const (
// Time allowed to write a message to the peer.
writeWait = 10 * time.Second
// Time allowed to read the next pong message from the peer.
pongWait = 60 * time.Second
// Send pings to peer with this period. Must be less than pongWait.
pingPeriod = (pongWait * 9) / 10
// Maximum message size allowed from peer.
maxMessageSize = 8000000
)
var newline = []byte{'\n'}
var wsupgrader = websocket.Upgrader{
ReadBufferSize: 1024,
WriteBufferSize: 1024,
// Acceppt Any
CheckOrigin: func(r *http.Request) bool { return true },
}
// Client is a middleman between the websocket connection and the hub.
type Client struct {
hub *Hub
// The websocket connection.
conn *websocket.Conn
// Buffered channel of outbound messages.
send chan []byte
}
// readPump pumps messages from the websocket connection to the hub.
//
// The application runs readPump in a per-connection goroutine. The application
// ensures that there is at most one reader on a connection by executing all
// reads from this goroutine.
func (c *Client) readPump() {
defer func() {
c.hub.unregister <- c
if err := c.conn.Close(); err != nil {
return
}
}()
c.conn.SetReadLimit(maxMessageSize)
if err := c.conn.SetReadDeadline(time.Now().Add(pongWait)); err != nil {
return
}
// disable G104 (CWE-703): Errors unhandled
// #nosec G104
c.conn.SetPongHandler(func(string) error { c.conn.SetReadDeadline(time.Now().Add(pongWait)); return nil })
for {
var packet Packet
if err := c.conn.ReadJSON(&packet); err != nil {
if websocket.IsUnexpectedCloseError(err, websocket.CloseGoingAway, websocket.CloseAbnormalClosure) {
logger.Errorf("%v", err)
}
if websocket.IsCloseError(err, websocket.CloseGoingAway) {
break
}
logger.Errorf("reading message: %v", err)
break
}
// Switch here over possible socket events and pull in handlers
switch packet.Type {
case "newEntry":
var entry string
if err := json.Unmarshal(packet.Content, &entry); err != nil {
logger.Errorf("Error reading json packet: %+v", err)
}
if err := c.hub.cb.AddEntry(entry); err != nil {
logger.Errorf("Error creating Clipboard entry: %+v", err)
}
c.refreshClipboard()
case "delEntry":
var id string
if err := json.Unmarshal(packet.Content, &id); err != nil {
logger.Errorf("Error reading json packet: %+v", err)
}
iid, err := strconv.Atoi(id)
if err != nil {
logger.Errorf("Error reading json packet: %+v", err)
}
if err := c.hub.cb.DeleteEntry(iid); err != nil {
logger.Errorf("Error to delete Clipboard entry with id: %s: %+v", string(packet.Content), err)
}
c.refreshClipboard()
case "clearClipboard":
if err := c.hub.cb.ClearClipboard(); err != nil {
logger.Errorf("Error clearing clipboard: %+v", err)
}
c.refreshClipboard()
case "command":
var command string
if err := json.Unmarshal(packet.Content, &command); err != nil {
logger.Errorf("Error reading json packet: %+v", err)
}
logger.Debugf("Command was: %+v", command)
output, err := cli.RunCMD(command)
if err != nil {
logger.Errorf("Error running command: %+v", err)
}
logger.Debugf("Output: %+v", output)
c.updateCLI(output)
default:
logger.Warnf("The event sent via websocket cannot be handeled: %+v", packet.Type)
}
}
}
// writePump pumps messages from the hub to the websocket connection.
//
// A goroutine running writePump is started for each connection. The
// application ensures that there is at most one writer to a connection by
// executing all writes from this goroutine.
func (c *Client) writePump() {
ticker := time.NewTicker(pingPeriod)
defer func() {
ticker.Stop()
if err := c.conn.Close(); err != nil {
return
}
}()
for {
select {
case message, ok := <-c.send:
if err := c.conn.SetWriteDeadline(time.Now().Add(writeWait)); err != nil {
return
}
if !ok {
// The hub closed the channel.
if err := c.conn.WriteMessage(websocket.CloseMessage, []byte{}); err != nil {
return
}
return
}
w, err := c.conn.NextWriter(websocket.TextMessage)
if err != nil {
return
}
if _, err := w.Write(message); err != nil {
return
}
// Add queued chat messages to the current websocket message.
n := len(c.send)
for i := 0; i < n; i++ {
if _, err := w.Write(newline); err != nil {
return
}
if _, err := w.Write(<-c.send); err != nil {
return
}
}
if err := w.Close(); err != nil {
return
}
case <-ticker.C:
if err := c.conn.SetWriteDeadline(time.Now().Add(writeWait)); err != nil {
return
}
if err := c.conn.WriteMessage(websocket.PingMessage, nil); err != nil {
return
}
}
}
}
// ServeWS will handle the socket connections
func ServeWS(hub *Hub, w http.ResponseWriter, r *http.Request) {
conn, err := wsupgrader.Upgrade(w, r, nil)
if err != nil {
logger.Errorf("Failed to upgrade ws: %+v", err)
return
}
client := &Client{hub: hub, conn: conn, send: make(chan []byte, 1024)}
client.hub.register <- client
go client.writePump()
go client.readPump()
}
func (c *Client) refreshClipboard() {
sendPkg := &SendPacket{
Type: "refreshClipboard",
}
broadcastMessage, err := json.Marshal(sendPkg)
if err != nil {
logger.Errorf("Unable to marshal json data in redirect: %+v", err)
}
c.hub.broadcast <- broadcastMessage
}
func (c *Client) updateCLI(output string) {
sendPkg := &SendPacket{
Type: "updateCLI",
Content: output,
}
broadcastMessage, err := json.Marshal(sendPkg)
if err != nil {
logger.Errorf("Unable to marshal json data in redirect: %+v", err)
}
c.hub.broadcast <- broadcastMessage
}