390 lines
8.8 KiB
Go
390 lines
8.8 KiB
Go
//Package whatsapp provides a developer API to interact with the WhatsAppWeb-Servers.
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package whatsapp
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import (
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"crypto/hmac"
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"crypto/sha256"
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"encoding/json"
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"fmt"
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"math/rand"
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"net/http"
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"os"
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"strconv"
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"strings"
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"sync"
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"time"
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"github.com/Rhymen/go-whatsapp/binary"
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"github.com/Rhymen/go-whatsapp/crypto/cbc"
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"github.com/gorilla/websocket"
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)
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type metric byte
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const (
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debugLog metric = iota + 1
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queryResume
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queryReceipt
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queryMedia
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queryChat
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queryContacts
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queryMessages
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presence
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presenceSubscribe
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group
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read
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chat
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received
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pic
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status
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message
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queryActions
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block
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queryGroup
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queryPreview
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queryEmoji
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queryMessageInfo
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spam
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querySearch
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queryIdentity
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queryUrl
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profile
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contact
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queryVcard
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queryStatus
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queryStatusUpdate
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privacyStatus
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queryLiveLocations
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liveLocation
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queryVname
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queryLabels
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call
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queryCall
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queryQuickReplies
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)
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type flag byte
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const (
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ignore flag = 1 << (7 - iota)
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ackRequest
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available
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notAvailable
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expires
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skipOffline
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)
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/*
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Conn is created by NewConn. Interacting with the initialized Conn is the main way of interacting with our package.
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It holds all necessary information to make the package work internally.
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*/
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type Conn struct {
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wsConn *websocket.Conn
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wsConnOK bool
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wsConnMutex sync.RWMutex
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session *Session
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listener map[string]chan string
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listenerMutex sync.RWMutex
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writeChan chan wsMsg
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handler []Handler
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msgCount int
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msgTimeout time.Duration
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Info *Info
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Store *Store
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ServerLastSeen time.Time
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longClientName string
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shortClientName string
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}
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type wsMsg struct {
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messageType int
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data []byte
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}
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/*
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Creates a new connection with a given timeout. The websocket connection to the WhatsAppWeb servers get´s established.
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The goroutine for handling incoming messages is started
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*/
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func NewConn(timeout time.Duration) (*Conn, error) {
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wac := &Conn{
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wsConn: nil, // will be set in connect()
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wsConnMutex: sync.RWMutex{},
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listener: make(map[string]chan string),
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listenerMutex: sync.RWMutex{},
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writeChan: make(chan wsMsg),
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handler: make([]Handler, 0),
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msgCount: 0,
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msgTimeout: timeout,
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Store: newStore(),
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longClientName: "github.com/rhymen/go-whatsapp",
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shortClientName: "go-whatsapp",
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}
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if err := wac.connect(); err != nil {
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return nil, err
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}
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go wac.readPump()
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go wac.writePump()
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go wac.keepAlive(20000, 90000)
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return wac, nil
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}
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func (wac *Conn) isConnected() bool {
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wac.wsConnMutex.RLock()
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defer wac.wsConnMutex.RUnlock()
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if wac.wsConn == nil {
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return false
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}
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if wac.wsConnOK {
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return true
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}
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// just send a keepalive to test the connection
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wac.sendKeepAlive()
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// this method is expected to be called by loops. So we can just return false
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return false
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}
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// connect should be guarded with wsConnMutex
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func (wac *Conn) connect() error {
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dialer := &websocket.Dialer{
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ReadBufferSize: 25 * 1024 * 1024,
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WriteBufferSize: 10 * 1024 * 1024,
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HandshakeTimeout: wac.msgTimeout,
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}
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headers := http.Header{"Origin": []string{"https://web.whatsapp.com"}}
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wsConn, _, err := dialer.Dial("wss://w3.web.whatsapp.com/ws", headers)
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if err != nil {
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return fmt.Errorf("couldn't dial whatsapp web websocket: %v", err)
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}
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wsConn.SetCloseHandler(func(code int, text string) error {
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fmt.Fprintf(os.Stderr, "websocket connection closed(%d, %s)\n", code, text)
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// from default CloseHandler
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message := websocket.FormatCloseMessage(code, "")
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wsConn.WriteControl(websocket.CloseMessage, message, time.Now().Add(time.Second))
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// our close handling
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if websocket.IsUnexpectedCloseError(err, websocket.CloseNormalClosure, websocket.CloseGoingAway) {
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fmt.Println("Trigger reconnect")
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go wac.reconnect()
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}
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return nil
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})
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wac.wsConn = wsConn
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wac.wsConnOK = true
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return nil
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}
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// reconnect should be run as go routine
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func (wac *Conn) reconnect() {
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wac.wsConnMutex.Lock()
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wac.wsConn.Close()
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wac.wsConn = nil
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wac.wsConnOK = false
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wac.wsConnMutex.Unlock()
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// wait up to 60 seconds and then reconnect. As writePump should send immediately, it might
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// reconnect as well. So we check its existance before reconnecting
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for !wac.isConnected() {
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time.Sleep(time.Duration(rand.Intn(60)) * time.Second)
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wac.wsConnMutex.Lock()
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if wac.wsConn == nil {
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if err := wac.connect(); err != nil {
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fmt.Fprintf(os.Stderr, "could not reconnect to websocket: %v\n", err)
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}
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}
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wac.wsConnMutex.Unlock()
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}
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}
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func (wac *Conn) write(data []interface{}) (<-chan string, error) {
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d, err := json.Marshal(data)
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if err != nil {
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return nil, err
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}
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ts := time.Now().Unix()
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messageTag := fmt.Sprintf("%d.--%d", ts, wac.msgCount)
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msg := fmt.Sprintf("%s,%s", messageTag, d)
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ch := make(chan string, 1)
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wac.listenerMutex.Lock()
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wac.listener[messageTag] = ch
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wac.listenerMutex.Unlock()
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wac.writeChan <- wsMsg{websocket.TextMessage, []byte(msg)}
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wac.msgCount++
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return ch, nil
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}
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func (wac *Conn) writeBinary(node binary.Node, metric metric, flag flag, tag string) (<-chan string, error) {
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if len(tag) < 2 {
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return nil, fmt.Errorf("no tag specified or to short")
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}
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b, err := binary.Marshal(node)
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if err != nil {
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return nil, err
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}
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cipher, err := cbc.Encrypt(wac.session.EncKey, nil, b)
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if err != nil {
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return nil, err
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}
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h := hmac.New(sha256.New, wac.session.MacKey)
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h.Write(cipher)
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hash := h.Sum(nil)
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data := []byte(tag + ",")
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data = append(data, byte(metric), byte(flag))
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data = append(data, hash[:32]...)
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data = append(data, cipher...)
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ch := make(chan string, 1)
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wac.listenerMutex.Lock()
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wac.listener[tag] = ch
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wac.listenerMutex.Unlock()
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msg := wsMsg{websocket.BinaryMessage, data}
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wac.writeChan <- msg
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wac.msgCount++
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return ch, nil
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}
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func (wac *Conn) readPump() {
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defer wac.wsConn.Close()
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for {
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msgType, msg, err := wac.wsConn.ReadMessage()
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if err != nil {
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wac.wsConnOK = false
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if websocket.IsUnexpectedCloseError(err, websocket.CloseGoingAway) {
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wac.handle(fmt.Errorf("unexpected websocket close: %v", err))
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}
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// sleep for a second and retry reading the next message
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time.Sleep(time.Second)
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continue
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}
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wac.wsConnOK = true
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data := strings.SplitN(string(msg), ",", 2)
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//Kepp-Alive Timestmap
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if data[0][0] == '!' {
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msecs, err := strconv.ParseInt(data[0][1:], 10, 64)
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if err != nil {
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fmt.Fprintf(os.Stderr, "Error converting time string to uint: %v\n", err)
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continue
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}
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wac.ServerLastSeen = time.Unix(msecs/1000, (msecs%1000)*int64(time.Millisecond))
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continue
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}
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wac.listenerMutex.RLock()
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listener, hasListener := wac.listener[data[0]]
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wac.listenerMutex.RUnlock()
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if hasListener && len(data[1]) > 0 {
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listener <- data[1]
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wac.listenerMutex.Lock()
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delete(wac.listener, data[0])
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wac.listenerMutex.Unlock()
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} else if msgType == 2 && wac.session != nil && wac.session.EncKey != nil {
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message, err := wac.decryptBinaryMessage([]byte(data[1]))
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if err != nil {
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wac.handle(fmt.Errorf("error decoding binary: %v", err))
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continue
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}
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wac.dispatch(message)
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} else {
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if len(data[1]) > 0 {
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wac.handle(string(data[1]))
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}
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}
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}
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}
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func (wac *Conn) writePump() {
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for msg := range wac.writeChan {
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for !wac.isConnected() {
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// reconnect to send the message ASAP
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wac.wsConnMutex.Lock()
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if wac.wsConn == nil {
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if err := wac.connect(); err != nil {
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fmt.Fprintf(os.Stderr, "could not reconnect to websocket: %v\n", err)
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}
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}
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wac.wsConnMutex.Unlock()
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if !wac.isConnected() {
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// reconnecting failed. Sleep for a while and try again afterwards
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time.Sleep(time.Duration(rand.Intn(5)) * time.Second)
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}
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}
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if err := wac.wsConn.WriteMessage(msg.messageType, msg.data); err != nil {
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fmt.Fprintf(os.Stderr, "error writing to socket: %v\n", err)
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wac.wsConnOK = false
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// add message to channel again to no loose it
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go func() {
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wac.writeChan <- msg
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}()
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}
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}
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}
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func (wac *Conn) sendKeepAlive() {
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// whatever issues might be there allow sending this message
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wac.wsConnOK = true
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wac.writeChan <- wsMsg{
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messageType: websocket.TextMessage,
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data: []byte("?,,"),
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}
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}
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func (wac *Conn) keepAlive(minIntervalMs int, maxIntervalMs int) {
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for {
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wac.sendKeepAlive()
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interval := rand.Intn(maxIntervalMs-minIntervalMs) + minIntervalMs
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<-time.After(time.Duration(interval) * time.Millisecond)
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}
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}
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func (wac *Conn) decryptBinaryMessage(msg []byte) (*binary.Node, error) {
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//message validation
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h2 := hmac.New(sha256.New, wac.session.MacKey)
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h2.Write([]byte(msg[32:]))
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if !hmac.Equal(h2.Sum(nil), msg[:32]) {
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return nil, fmt.Errorf("message received with invalid hmac")
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}
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// message decrypt
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d, err := cbc.Decrypt(wac.session.EncKey, nil, msg[32:])
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if err != nil {
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return nil, fmt.Errorf("error decrypting message with AES: %v", err)
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}
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// message unmarshal
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message, err := binary.Unmarshal(d)
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if err != nil {
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return nil, fmt.Errorf("error decoding binary: %v", err)
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}
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return message, nil
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}
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