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BurpClient.go
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BurpClient.go
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package chatapi
import (
"bytes"
"encoding/base64"
"encoding/json"
"github.com/gorilla/websocket"
"log"
"net/http"
"reflect"
"strconv"
"strings"
"time"
)
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 = 8192 * 8192
)
var upgrader = websocket.Upgrader{
ReadBufferSize: 8192 * 8192,
WriteBufferSize: 8192 * 8192,
}
// Client is a middleman between the websocket connection and the hub.
type Client struct {
hub *Hub
authenticated bool
mutedClients []string
roomName string
name string
// The websocket connection.
conn *websocket.Conn
// Buffered channel of outbound messages.
send chan []byte
}
func (c *Client) parseMessage(message *BurpTCMessage) {
switch message.MessageType {
case "SYNC_SCOPE_MESSAGE":
if message.MessageTarget != "Self" {
log.Printf("received new scope from %s", c.name)
c.hub.rooms[c.roomName].scope = message.Data
} else {
log.Printf("%s requesting scope", c.name)
message.Data = c.hub.rooms[c.roomName].scope
}
c.hub.broadcast <- c.hub.generateMessage(message, c, c.roomName, message.MessageTarget)
case "JOIN_ROOM_MESSAGE":
if len(c.hub.rooms[message.MessageTarget].password) > 0 {
if c.authenticated {
log.Printf("%s joining room: %s", c.name, message.MessageTarget)
c.hub.rooms[c.roomName].deleteClient(c.name)
c.hub.rooms[message.MessageTarget].addClient(c)
c.roomName = message.MessageTarget
c.hub.updateRoomMembers(c.roomName)
c.sendRoomMessages()
} else {
//bad password
message.MessageType = "BAD_PASSWORD_MESSAGE"
c.hub.broadcast <- c.hub.generateMessage(message, c, c.roomName, "Self")
}
} else {
log.Printf("%s joining room: %s", c.name, message.MessageTarget)
c.hub.rooms[c.roomName].deleteClient(c.name)
c.hub.rooms[message.MessageTarget].addClient(c)
c.roomName = message.MessageTarget
c.hub.updateRoomMembers(c.roomName)
c.sendRoomMessages()
}
case "LEAVE_ROOM_MESSAGE":
log.Printf("leaving room: %s", c.roomName)
c.hub.rooms[c.roomName].deleteClient(c.name)
c.hub.rooms["server"].addClient(c)
if len(c.hub.rooms[c.roomName].clients) == 0 {
c.hub.deleteRoom(c.roomName)
} else {
c.hub.updateRoomMembers(c.roomName)
}
c.hub.updateRooms()
c.authenticated = false
c.roomName = "server"
case "ADD_ROOM_MESSAGE":
log.Printf("creating new room: " + message.MessageTarget)
c.hub.rooms[c.roomName].deleteClient(c.name)
c.hub.addRoom(message.MessageTarget, NewRoom(message.Data))
c.hub.rooms[message.MessageTarget].addClient(c)
c.roomName = message.MessageTarget
c.hub.updateRoomMembers(c.roomName)
c.sendRoomMessages()
case "MUTE_MESSAGE":
if message.MessageTarget == "All" {
keys := reflect.ValueOf(c.hub.rooms[c.roomName].clients).MapKeys()
log.Printf("Clients to mute %s", keys)
for i := 0; i < len(keys); i++ {
key := keys[i].String()
if key != c.name {
c.mutedClients = append(c.mutedClients, key)
}
}
} else {
log.Printf("Client to mute %s", message.MessageTarget)
c.mutedClients = append(c.mutedClients, message.MessageTarget)
}
log.Printf("%s muted these clients %s", c.name, c.mutedClients)
case "UNMUTE_MESSAGE":
if message.MessageTarget == "All" {
keys := reflect.ValueOf(c.hub.rooms[c.roomName].clients).MapKeys()
for i := 0; i < len(keys); i++ {
key := keys[i].String()
if key != c.name {
c.mutedClients = remove(c.mutedClients, index(c.mutedClients, keys[i].String()))
}
}
} else {
c.mutedClients = remove(c.mutedClients, index(c.mutedClients, message.MessageTarget))
}
log.Printf("%s unmuted %s", c.name, message.MessageTarget)
case "GET_ROOMS_MESSAGE":
rooms := c.hub.rooms
keys := make([]string, 0, len(rooms))
for k := range rooms {
if k != "server" {
keys = append(keys, k+"::"+strconv.FormatBool(len(rooms[k].password) > 0))
}
}
message.Data = strings.Join(keys, ",")
c.hub.broadcast <- c.hub.generateMessage(message, c, c.roomName, message.MessageTarget)
case "COMMENT_MESSAGE":
log.Printf("Got comment message: " + message.String())
c.hub.rooms[c.roomName].comments.setRequestWithComments(message.Data, *message.BurpRequestResponse)
log.Printf("%d comments in room", len(c.hub.rooms[c.roomName].comments.requestsWithComments))
c.hub.broadcast <- c.hub.generateMessage(message, c, c.roomName, message.MessageTarget)
case "CHECK_PASSWORD_MESSAGE":
if c.hub.rooms[message.MessageTarget].password == message.Data {
log.Printf("%s supplied orrect password for room: %s", c.name, message.MessageTarget)
c.authenticated = true
message.MessageType = "GOOD_PASSWORD_MESSAGE"
c.hub.broadcast <- c.hub.generateMessage(message, c, c.roomName, "Self")
} else {
//bad password
message.MessageType = "BAD_PASSWORD_MESSAGE"
c.hub.broadcast <- c.hub.generateMessage(message, c, c.roomName, "Self")
}
case "COOKIE_MESSAGE":
fallthrough
case "SCAN_ISSUE_MESSAGE":
fallthrough
case "REPEATER_MESSAGE":
fallthrough
case "INTRUDER_MESSAGE":
fallthrough
case "BURP_MESSAGE":
c.hub.broadcast <- c.hub.generateMessage(message, c, c.roomName, message.MessageTarget)
default:
log.Println("ERROR: unknown message type")
}
}
func remove(s []string, i int) []string {
s[i] = s[len(s)-1]
return s[:len(s)-1]
}
func index(vs []string, t string) int {
for i, v := range vs {
if v == t {
return i
}
}
return -1
}
func (c *Client) isGivenClientMuted(clientName string) bool {
for _, client := range c.mutedClients {
if client == clientName {
return true
}
}
return false
}
// 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.rooms[c.roomName].deleteClient(c.name)
if c.roomName != "server" {
if len(c.hub.rooms[c.roomName].clients) == 0 {
c.hub.deleteRoom(c.roomName)
} else {
c.hub.updateRoomMembers(c.roomName)
}
c.roomName = "server"
}
close(c.send)
c.hub.removeClientFromServerList(c.name)
log.Println("Client Leaving")
c.conn.Close()
}()
c.conn.SetReadLimit(maxMessageSize)
c.conn.SetReadDeadline(time.Now().Add(pongWait))
c.conn.SetPongHandler(func(string) error { c.conn.SetReadDeadline(time.Now().Add(pongWait)); return nil })
for {
_, msg, err := c.conn.ReadMessage()
if err != nil {
if websocket.IsUnexpectedCloseError(err, websocket.CloseGoingAway, websocket.CloseAbnormalClosure) {
log.Printf("error: %v", err)
}
break
}
newBurpMessage := NewBurpTCMessage()
decodedBytes := make([]byte, base64.StdEncoding.DecodedLen(len(msg)))
base64.StdEncoding.Decode(decodedBytes, msg)
log.Printf(string(decodedBytes))
if err := json.Unmarshal(bytes.Trim(decodedBytes, "\x00"), &newBurpMessage); err != nil {
log.Printf("Could not unmarshal BurpTCMessage, error: %s \n", err)
} else {
c.parseMessage(newBurpMessage)
}
}
}
func (c *Client) write(mt int, payload []byte) error {
c.conn.SetWriteDeadline(time.Now().Add(writeWait))
return c.conn.WriteMessage(mt, payload)
}
func (c *Client) sendRoomMessages() {
if len(c.hub.rooms[c.roomName].comments.requestsWithComments) != 0 {
c.hub.rooms[c.roomName].Lock()
defer c.hub.rooms[c.roomName].Unlock()
msg := NewBurpTCMessage()
msg.MessageType = "GET_COMMENTS_MESSAGE"
burpMessagesWithComments := make([]BurpRequestResponse, len(c.hub.rooms[c.roomName].comments.requestsWithComments))
idx := 0
for _, value := range c.hub.rooms[c.roomName].comments.requestsWithComments {
burpMessagesWithComments[idx] = value
log.Printf(value.String())
idx++
}
log.Printf("Sending %d current room messages to %s", len(burpMessagesWithComments), c.name)
jsonData, err := json.Marshal(burpMessagesWithComments)
if err != nil {
log.Println(err)
} else {
msg.Data = string(jsonData)
c.hub.broadcast <- c.hub.generateMessage(msg, c, c.roomName, "Self")
}
}
}
// 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()
c.conn.Close()
}()
for {
select {
case message, ok := <-c.send:
c.conn.SetWriteDeadline(time.Now().Add(writeWait))
if !ok {
// The hub closed the channel.
c.write(websocket.CloseMessage, []byte{})
return
}
if err := c.write(websocket.TextMessage, message); err != nil {
return
}
case <-ticker.C:
c.conn.SetWriteDeadline(time.Now().Add(writeWait))
if err := c.write(websocket.PingMessage, nil); err != nil {
return
}
}
}
}
// serveWs handles websocket requests from the peer.
func ServeWs(hub *Hub, w http.ResponseWriter, r *http.Request) {
if authHeader := r.Header.Get("Auth"); authHeader == hub.serverPassword {
if hub.clientExistsInServer(r.Header.Get("Username")) {
log.Println("Found duplicate name")
w.WriteHeader(http.StatusConflict)
w.Write([]byte("409 - Duplicate name in server!"))
} else {
conn, err := upgrader.Upgrade(w, r, nil)
if err != nil {
log.Println(err)
return
}
client := &Client{hub: hub, conn: conn, send: make(chan []byte, 8196*8196),
name: r.Header.Get("Username"), roomName: "server", authenticated: false}
//s := subscription{client, "server"}
hub.register <- client
// Allow collection of memory referenced by the caller by doing all work in
// new goroutines.
go client.writePump()
go client.readPump()
}
} else {
w.WriteHeader(http.StatusUnauthorized)
w.Write([]byte("401 - Bad Auth!"))
}
}