390 lines
8.8 KiB
Go
390 lines
8.8 KiB
Go
//Package whatsapp provides a developer API to interact with the WhatsAppWeb-Servers.
|
||
package whatsapp
|
||
|
||
import (
|
||
"crypto/hmac"
|
||
"crypto/sha256"
|
||
"encoding/json"
|
||
"fmt"
|
||
"math/rand"
|
||
"net/http"
|
||
"os"
|
||
"strconv"
|
||
"strings"
|
||
"sync"
|
||
"time"
|
||
|
||
"github.com/Rhymen/go-whatsapp/binary"
|
||
"github.com/Rhymen/go-whatsapp/crypto/cbc"
|
||
"github.com/gorilla/websocket"
|
||
)
|
||
|
||
type metric byte
|
||
|
||
const (
|
||
debugLog metric = iota + 1
|
||
queryResume
|
||
queryReceipt
|
||
queryMedia
|
||
queryChat
|
||
queryContacts
|
||
queryMessages
|
||
presence
|
||
presenceSubscribe
|
||
group
|
||
read
|
||
chat
|
||
received
|
||
pic
|
||
status
|
||
message
|
||
queryActions
|
||
block
|
||
queryGroup
|
||
queryPreview
|
||
queryEmoji
|
||
queryMessageInfo
|
||
spam
|
||
querySearch
|
||
queryIdentity
|
||
queryUrl
|
||
profile
|
||
contact
|
||
queryVcard
|
||
queryStatus
|
||
queryStatusUpdate
|
||
privacyStatus
|
||
queryLiveLocations
|
||
liveLocation
|
||
queryVname
|
||
queryLabels
|
||
call
|
||
queryCall
|
||
queryQuickReplies
|
||
)
|
||
|
||
type flag byte
|
||
|
||
const (
|
||
ignore flag = 1 << (7 - iota)
|
||
ackRequest
|
||
available
|
||
notAvailable
|
||
expires
|
||
skipOffline
|
||
)
|
||
|
||
/*
|
||
Conn is created by NewConn. Interacting with the initialized Conn is the main way of interacting with our package.
|
||
It holds all necessary information to make the package work internally.
|
||
*/
|
||
type Conn struct {
|
||
wsConn *websocket.Conn
|
||
wsConnOK bool
|
||
wsConnMutex sync.RWMutex
|
||
session *Session
|
||
listener map[string]chan string
|
||
listenerMutex sync.RWMutex
|
||
writeChan chan wsMsg
|
||
handler []Handler
|
||
msgCount int
|
||
msgTimeout time.Duration
|
||
Info *Info
|
||
Store *Store
|
||
ServerLastSeen time.Time
|
||
|
||
longClientName string
|
||
shortClientName string
|
||
}
|
||
|
||
type wsMsg struct {
|
||
messageType int
|
||
data []byte
|
||
}
|
||
|
||
/*
|
||
Creates a new connection with a given timeout. The websocket connection to the WhatsAppWeb servers get´s established.
|
||
The goroutine for handling incoming messages is started
|
||
*/
|
||
func NewConn(timeout time.Duration) (*Conn, error) {
|
||
wac := &Conn{
|
||
wsConn: nil, // will be set in connect()
|
||
wsConnMutex: sync.RWMutex{},
|
||
listener: make(map[string]chan string),
|
||
listenerMutex: sync.RWMutex{},
|
||
writeChan: make(chan wsMsg),
|
||
handler: make([]Handler, 0),
|
||
msgCount: 0,
|
||
msgTimeout: timeout,
|
||
Store: newStore(),
|
||
|
||
longClientName: "github.com/rhymen/go-whatsapp",
|
||
shortClientName: "go-whatsapp",
|
||
}
|
||
|
||
if err := wac.connect(); err != nil {
|
||
return nil, err
|
||
}
|
||
|
||
go wac.readPump()
|
||
go wac.writePump()
|
||
go wac.keepAlive(20000, 90000)
|
||
|
||
return wac, nil
|
||
}
|
||
|
||
func (wac *Conn) isConnected() bool {
|
||
wac.wsConnMutex.RLock()
|
||
defer wac.wsConnMutex.RUnlock()
|
||
if wac.wsConn == nil {
|
||
return false
|
||
}
|
||
if wac.wsConnOK {
|
||
return true
|
||
}
|
||
|
||
// just send a keepalive to test the connection
|
||
wac.sendKeepAlive()
|
||
|
||
// this method is expected to be called by loops. So we can just return false
|
||
return false
|
||
}
|
||
|
||
// connect should be guarded with wsConnMutex
|
||
func (wac *Conn) connect() error {
|
||
dialer := &websocket.Dialer{
|
||
ReadBufferSize: 25 * 1024 * 1024,
|
||
WriteBufferSize: 10 * 1024 * 1024,
|
||
HandshakeTimeout: wac.msgTimeout,
|
||
}
|
||
|
||
headers := http.Header{"Origin": []string{"https://web.whatsapp.com"}}
|
||
wsConn, _, err := dialer.Dial("wss://web.whatsapp.com/ws", headers)
|
||
if err != nil {
|
||
return fmt.Errorf("couldn't dial whatsapp web websocket: %v", err)
|
||
}
|
||
|
||
wsConn.SetCloseHandler(func(code int, text string) error {
|
||
fmt.Fprintf(os.Stderr, "websocket connection closed(%d, %s)\n", code, text)
|
||
|
||
// from default CloseHandler
|
||
message := websocket.FormatCloseMessage(code, "")
|
||
wsConn.WriteControl(websocket.CloseMessage, message, time.Now().Add(time.Second))
|
||
|
||
// our close handling
|
||
if websocket.IsUnexpectedCloseError(err, websocket.CloseNormalClosure, websocket.CloseGoingAway) {
|
||
fmt.Println("Trigger reconnect")
|
||
go wac.reconnect()
|
||
}
|
||
return nil
|
||
})
|
||
|
||
wac.wsConn = wsConn
|
||
wac.wsConnOK = true
|
||
return nil
|
||
}
|
||
|
||
// reconnect should be run as go routine
|
||
func (wac *Conn) reconnect() {
|
||
wac.wsConnMutex.Lock()
|
||
wac.wsConn.Close()
|
||
wac.wsConn = nil
|
||
wac.wsConnOK = false
|
||
wac.wsConnMutex.Unlock()
|
||
|
||
// wait up to 60 seconds and then reconnect. As writePump should send immediately, it might
|
||
// reconnect as well. So we check its existance before reconnecting
|
||
for !wac.isConnected() {
|
||
time.Sleep(time.Duration(rand.Intn(60)) * time.Second)
|
||
|
||
wac.wsConnMutex.Lock()
|
||
if wac.wsConn == nil {
|
||
if err := wac.connect(); err != nil {
|
||
fmt.Fprintf(os.Stderr, "could not reconnect to websocket: %v\n", err)
|
||
}
|
||
}
|
||
wac.wsConnMutex.Unlock()
|
||
}
|
||
}
|
||
|
||
func (wac *Conn) write(data []interface{}) (<-chan string, error) {
|
||
d, err := json.Marshal(data)
|
||
if err != nil {
|
||
return nil, err
|
||
}
|
||
|
||
ts := time.Now().Unix()
|
||
messageTag := fmt.Sprintf("%d.--%d", ts, wac.msgCount)
|
||
msg := fmt.Sprintf("%s,%s", messageTag, d)
|
||
|
||
ch := make(chan string, 1)
|
||
|
||
wac.listenerMutex.Lock()
|
||
wac.listener[messageTag] = ch
|
||
wac.listenerMutex.Unlock()
|
||
|
||
wac.writeChan <- wsMsg{websocket.TextMessage, []byte(msg)}
|
||
|
||
wac.msgCount++
|
||
return ch, nil
|
||
}
|
||
|
||
func (wac *Conn) writeBinary(node binary.Node, metric metric, flag flag, tag string) (<-chan string, error) {
|
||
if len(tag) < 2 {
|
||
return nil, fmt.Errorf("no tag specified or to short")
|
||
}
|
||
b, err := binary.Marshal(node)
|
||
if err != nil {
|
||
return nil, err
|
||
}
|
||
|
||
cipher, err := cbc.Encrypt(wac.session.EncKey, nil, b)
|
||
if err != nil {
|
||
return nil, err
|
||
}
|
||
|
||
h := hmac.New(sha256.New, wac.session.MacKey)
|
||
h.Write(cipher)
|
||
hash := h.Sum(nil)
|
||
|
||
data := []byte(tag + ",")
|
||
data = append(data, byte(metric), byte(flag))
|
||
data = append(data, hash[:32]...)
|
||
data = append(data, cipher...)
|
||
|
||
ch := make(chan string, 1)
|
||
|
||
wac.listenerMutex.Lock()
|
||
wac.listener[tag] = ch
|
||
wac.listenerMutex.Unlock()
|
||
|
||
msg := wsMsg{websocket.BinaryMessage, data}
|
||
wac.writeChan <- msg
|
||
|
||
wac.msgCount++
|
||
return ch, nil
|
||
}
|
||
|
||
func (wac *Conn) readPump() {
|
||
defer wac.wsConn.Close()
|
||
|
||
for {
|
||
msgType, msg, err := wac.wsConn.ReadMessage()
|
||
if err != nil {
|
||
wac.wsConnOK = false
|
||
if websocket.IsUnexpectedCloseError(err, websocket.CloseGoingAway) {
|
||
wac.handle(fmt.Errorf("unexpected websocket close: %v", err))
|
||
}
|
||
// sleep for a second and retry reading the next message
|
||
time.Sleep(time.Second)
|
||
continue
|
||
}
|
||
wac.wsConnOK = true
|
||
|
||
data := strings.SplitN(string(msg), ",", 2)
|
||
|
||
//Kepp-Alive Timestmap
|
||
if data[0][0] == '!' {
|
||
msecs, err := strconv.ParseInt(data[0][1:], 10, 64)
|
||
if err != nil {
|
||
fmt.Fprintf(os.Stderr, "Error converting time string to uint: %v\n", err)
|
||
continue
|
||
}
|
||
wac.ServerLastSeen = time.Unix(msecs/1000, (msecs%1000)*int64(time.Millisecond))
|
||
continue
|
||
}
|
||
|
||
wac.listenerMutex.RLock()
|
||
listener, hasListener := wac.listener[data[0]]
|
||
wac.listenerMutex.RUnlock()
|
||
|
||
if len(data[1]) == 0 {
|
||
continue
|
||
} else if hasListener {
|
||
listener <- data[1]
|
||
|
||
wac.listenerMutex.Lock()
|
||
delete(wac.listener, data[0])
|
||
wac.listenerMutex.Unlock()
|
||
} else if msgType == 2 && wac.session != nil && wac.session.EncKey != nil {
|
||
message, err := wac.decryptBinaryMessage([]byte(data[1]))
|
||
if err != nil {
|
||
wac.handle(fmt.Errorf("error decoding binary: %v", err))
|
||
continue
|
||
}
|
||
|
||
wac.dispatch(message)
|
||
} else {
|
||
wac.handle(string(data[1]))
|
||
}
|
||
|
||
}
|
||
}
|
||
|
||
func (wac *Conn) writePump() {
|
||
for msg := range wac.writeChan {
|
||
for !wac.isConnected() {
|
||
// reconnect to send the message ASAP
|
||
wac.wsConnMutex.Lock()
|
||
if wac.wsConn == nil {
|
||
if err := wac.connect(); err != nil {
|
||
fmt.Fprintf(os.Stderr, "could not reconnect to websocket: %v\n", err)
|
||
}
|
||
}
|
||
wac.wsConnMutex.Unlock()
|
||
if !wac.isConnected() {
|
||
// reconnecting failed. Sleep for a while and try again afterwards
|
||
time.Sleep(time.Duration(rand.Intn(5)) * time.Second)
|
||
}
|
||
}
|
||
if err := wac.wsConn.WriteMessage(msg.messageType, msg.data); err != nil {
|
||
fmt.Fprintf(os.Stderr, "error writing to socket: %v\n", err)
|
||
wac.wsConnOK = false
|
||
// add message to channel again to no loose it
|
||
go func() {
|
||
wac.writeChan <- msg
|
||
}()
|
||
}
|
||
}
|
||
}
|
||
|
||
func (wac *Conn) sendKeepAlive() {
|
||
// whatever issues might be there allow sending this message
|
||
wac.wsConnOK = true
|
||
wac.writeChan <- wsMsg{
|
||
messageType: websocket.TextMessage,
|
||
data: []byte("?,,"),
|
||
}
|
||
}
|
||
|
||
func (wac *Conn) keepAlive(minIntervalMs int, maxIntervalMs int) {
|
||
for {
|
||
wac.sendKeepAlive()
|
||
interval := rand.Intn(maxIntervalMs-minIntervalMs) + minIntervalMs
|
||
<-time.After(time.Duration(interval) * time.Millisecond)
|
||
}
|
||
}
|
||
|
||
func (wac *Conn) decryptBinaryMessage(msg []byte) (*binary.Node, error) {
|
||
//message validation
|
||
h2 := hmac.New(sha256.New, wac.session.MacKey)
|
||
h2.Write([]byte(msg[32:]))
|
||
if !hmac.Equal(h2.Sum(nil), msg[:32]) {
|
||
return nil, fmt.Errorf("message received with invalid hmac")
|
||
}
|
||
|
||
// message decrypt
|
||
d, err := cbc.Decrypt(wac.session.EncKey, nil, msg[32:])
|
||
if err != nil {
|
||
return nil, fmt.Errorf("error decrypting message with AES: %v", err)
|
||
}
|
||
|
||
// message unmarshal
|
||
message, err := binary.Unmarshal(d)
|
||
if err != nil {
|
||
return nil, fmt.Errorf("error decoding binary: %v", err)
|
||
}
|
||
|
||
return message, nil
|
||
}
|