mirror of
https://github.com/42wim/matterbridge.git
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517 lines
15 KiB
Go
517 lines
15 KiB
Go
package whatsapp
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import (
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"crypto/hmac"
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"crypto/rand"
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"crypto/sha256"
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"encoding/base64"
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"encoding/json"
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"fmt"
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"strconv"
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"strings"
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"sync/atomic"
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"time"
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"github.com/Rhymen/go-whatsapp/crypto/cbc"
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"github.com/Rhymen/go-whatsapp/crypto/curve25519"
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"github.com/Rhymen/go-whatsapp/crypto/hkdf"
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)
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//represents the WhatsAppWeb client version
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var waVersion = []int{0, 3, 3324}
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/*
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Session contains session individual information. To be able to resume the connection without scanning the qr code
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every time you should save the Session returned by Login and use RestoreWithSession the next time you want to login.
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Every successful created connection returns a new Session. The Session(ClientToken, ServerToken) is altered after
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every re-login and should be saved every time.
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*/
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type Session struct {
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ClientId string
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ClientToken string
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ServerToken string
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EncKey []byte
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MacKey []byte
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Wid string
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}
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type Info struct {
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Battery int
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Platform string
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Connected bool
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Pushname string
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Wid string
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Lc string
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Phone *PhoneInfo
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Plugged bool
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Tos int
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Lg string
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Is24h bool
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}
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type PhoneInfo struct {
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Mcc string
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Mnc string
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OsVersion string
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DeviceManufacturer string
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DeviceModel string
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OsBuildNumber string
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WaVersion string
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}
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func newInfoFromReq(info map[string]interface{}) *Info {
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phoneInfo := info["phone"].(map[string]interface{})
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ret := &Info{
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Battery: int(info["battery"].(float64)),
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Platform: info["platform"].(string),
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Connected: info["connected"].(bool),
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Pushname: info["pushname"].(string),
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Wid: info["wid"].(string),
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Lc: info["lc"].(string),
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Phone: &PhoneInfo{
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phoneInfo["mcc"].(string),
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phoneInfo["mnc"].(string),
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phoneInfo["os_version"].(string),
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phoneInfo["device_manufacturer"].(string),
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phoneInfo["device_model"].(string),
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phoneInfo["os_build_number"].(string),
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phoneInfo["wa_version"].(string),
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},
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Plugged: info["plugged"].(bool),
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Lg: info["lg"].(string),
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Tos: int(info["tos"].(float64)),
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}
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if is24h, ok := info["is24h"]; ok {
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ret.Is24h = is24h.(bool)
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}
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return ret
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}
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/*
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CheckCurrentServerVersion is based on the login method logic in order to establish the websocket connection and get
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the current version from the server with the `admin init` command. This can be very useful for automations in which
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you need to quickly perceive new versions (mostly patches) and update your application so it suddenly stops working.
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*/
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func CheckCurrentServerVersion() ([]int, error) {
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wac, err := NewConn(5 * time.Second)
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if err != nil {
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return nil, fmt.Errorf("fail to create connection")
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}
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clientId := make([]byte, 16)
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if _, err = rand.Read(clientId); err != nil {
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return nil, fmt.Errorf("error creating random ClientId: %v", err)
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}
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b64ClientId := base64.StdEncoding.EncodeToString(clientId)
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login := []interface{}{"admin", "init", waVersion, []string{wac.longClientName, wac.shortClientName}, b64ClientId, true}
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loginChan, err := wac.writeJson(login)
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if err != nil {
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return nil, fmt.Errorf("error writing login", err)
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}
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// Retrieve an answer from the websocket
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var r string
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select {
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case r = <-loginChan:
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case <-time.After(wac.msgTimeout):
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return nil, fmt.Errorf("login connection timed out")
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}
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var resp map[string]interface{}
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if err = json.Unmarshal([]byte(r), &resp); err != nil {
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return nil, fmt.Errorf("error decoding login", err)
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}
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// Take the curr property as X.Y.Z and split it into as int slice
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curr := resp["curr"].(string)
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currArray := strings.Split(curr, ".")
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version := make([]int, len(currArray))
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for i := range version {
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version[i], _ = strconv.Atoi(currArray[i])
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}
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return version, nil
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}
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/*
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SetClientName sets the long and short client names that are sent to WhatsApp when logging in and displayed in the
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WhatsApp Web device list. As the values are only sent when logging in, changing them after logging in is not possible.
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*/
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func (wac *Conn) SetClientName(long, short string) error {
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if wac.session != nil && (wac.session.EncKey != nil || wac.session.MacKey != nil) {
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return fmt.Errorf("cannot change client name after logging in")
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}
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wac.longClientName, wac.shortClientName = long, short
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return nil
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}
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/*
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SetClientVersion sets WhatsApp client version
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Default value is 0.3.3324
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*/
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func (wac *Conn) SetClientVersion(major int, minor int, patch int) {
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waVersion = []int{major, minor, patch}
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}
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// GetClientVersion returns WhatsApp client version
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func (wac *Conn) GetClientVersion() []int {
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return waVersion
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}
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/*
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Login is the function that creates a new whatsapp session and logs you in. If you do not want to scan the qr code
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every time, you should save the returned session and use RestoreWithSession the next time. Login takes a writable channel
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as an parameter. This channel is used to push the data represented by the qr code back to the user. The received data
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should be displayed as an qr code in a way you prefer. To print a qr code to console you can use:
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github.com/Baozisoftware/qrcode-terminal-go Example login procedure:
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wac, err := whatsapp.NewConn(5 * time.Second)
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if err != nil {
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panic(err)
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}
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qr := make(chan string)
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go func() {
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terminal := qrcodeTerminal.New()
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terminal.Get(<-qr).Print()
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}()
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session, err := wac.Login(qr)
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if err != nil {
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fmt.Fprintf(os.Stderr, "error during login: %v\n", err)
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}
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fmt.Printf("login successful, session: %v\n", session)
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*/
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func (wac *Conn) Login(qrChan chan<- string) (Session, error) {
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session := Session{}
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//Makes sure that only a single Login or Restore can happen at the same time
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if !atomic.CompareAndSwapUint32(&wac.sessionLock, 0, 1) {
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return session, ErrLoginInProgress
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}
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defer atomic.StoreUint32(&wac.sessionLock, 0)
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if wac.loggedIn {
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return session, ErrAlreadyLoggedIn
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}
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if err := wac.connect(); err != nil && err != ErrAlreadyConnected {
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return session, err
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}
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//logged in?!?
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if wac.session != nil && (wac.session.EncKey != nil || wac.session.MacKey != nil) {
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return session, fmt.Errorf("already logged in")
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}
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clientId := make([]byte, 16)
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_, err := rand.Read(clientId)
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if err != nil {
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return session, fmt.Errorf("error creating random ClientId: %v", err)
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}
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session.ClientId = base64.StdEncoding.EncodeToString(clientId)
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login := []interface{}{"admin", "init", waVersion, []string{wac.longClientName, wac.shortClientName}, session.ClientId, true}
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loginChan, err := wac.writeJson(login)
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if err != nil {
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return session, fmt.Errorf("error writing login: %v\n", err)
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}
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var r string
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select {
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case r = <-loginChan:
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case <-time.After(wac.msgTimeout):
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return session, fmt.Errorf("login connection timed out")
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}
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var resp map[string]interface{}
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if err = json.Unmarshal([]byte(r), &resp); err != nil {
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return session, fmt.Errorf("error decoding login resp: %v\n", err)
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}
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ref := resp["ref"].(string)
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priv, pub, err := curve25519.GenerateKey()
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if err != nil {
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return session, fmt.Errorf("error generating keys: %v\n", err)
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}
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//listener for Login response
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s1 := make(chan string, 1)
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wac.listener.Lock()
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wac.listener.m["s1"] = s1
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wac.listener.Unlock()
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qrChan <- fmt.Sprintf("%v,%v,%v", ref, base64.StdEncoding.EncodeToString(pub[:]), session.ClientId)
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var resp2 []interface{}
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select {
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case r1 := <-s1:
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wac.loginSessionLock.Lock()
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defer wac.loginSessionLock.Unlock()
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if err := json.Unmarshal([]byte(r1), &resp2); err != nil {
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return session, fmt.Errorf("error decoding qr code resp: %v", err)
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}
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case <-time.After(time.Duration(resp["ttl"].(float64)) * time.Millisecond):
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return session, fmt.Errorf("qr code scan timed out")
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}
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info := resp2[1].(map[string]interface{})
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wac.Info = newInfoFromReq(info)
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session.ClientToken = info["clientToken"].(string)
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session.ServerToken = info["serverToken"].(string)
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session.Wid = info["wid"].(string)
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s := info["secret"].(string)
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decodedSecret, err := base64.StdEncoding.DecodeString(s)
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if err != nil {
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return session, fmt.Errorf("error decoding secret: %v", err)
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}
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var pubKey [32]byte
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copy(pubKey[:], decodedSecret[:32])
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sharedSecret := curve25519.GenerateSharedSecret(*priv, pubKey)
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hash := sha256.New
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nullKey := make([]byte, 32)
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h := hmac.New(hash, nullKey)
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h.Write(sharedSecret)
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sharedSecretExtended, err := hkdf.Expand(h.Sum(nil), 80, "")
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if err != nil {
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return session, fmt.Errorf("hkdf error: %v", err)
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}
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//login validation
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checkSecret := make([]byte, 112)
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copy(checkSecret[:32], decodedSecret[:32])
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copy(checkSecret[32:], decodedSecret[64:])
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h2 := hmac.New(hash, sharedSecretExtended[32:64])
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h2.Write(checkSecret)
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if !hmac.Equal(h2.Sum(nil), decodedSecret[32:64]) {
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return session, fmt.Errorf("abort login")
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}
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keysEncrypted := make([]byte, 96)
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copy(keysEncrypted[:16], sharedSecretExtended[64:])
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copy(keysEncrypted[16:], decodedSecret[64:])
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keyDecrypted, err := cbc.Decrypt(sharedSecretExtended[:32], nil, keysEncrypted)
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if err != nil {
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return session, fmt.Errorf("error decryptAes: %v", err)
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}
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session.EncKey = keyDecrypted[:32]
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session.MacKey = keyDecrypted[32:64]
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wac.session = &session
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wac.loggedIn = true
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return session, nil
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}
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//TODO: GoDoc
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/*
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Basically the old RestoreSession functionality
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*/
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func (wac *Conn) RestoreWithSession(session Session) (_ Session, err error) {
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if wac.loggedIn {
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return Session{}, ErrAlreadyLoggedIn
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}
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old := wac.session
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defer func() {
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if err != nil {
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wac.session = old
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}
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}()
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wac.session = &session
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if err = wac.Restore(); err != nil {
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wac.session = nil
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return Session{}, err
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}
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return *wac.session, nil
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}
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/*//TODO: GoDoc
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RestoreWithSession is the function that restores a given session. It will try to reestablish the connection to the
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WhatsAppWeb servers with the provided session. If it succeeds it will return a new session. This new session has to be
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saved because the Client and Server-Token will change after every login. Logging in with old tokens is possible, but not
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suggested. If so, a challenge has to be resolved which is just another possible point of failure.
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*/
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func (wac *Conn) Restore() error {
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//Makes sure that only a single Login or Restore can happen at the same time
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if !atomic.CompareAndSwapUint32(&wac.sessionLock, 0, 1) {
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return ErrLoginInProgress
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}
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defer atomic.StoreUint32(&wac.sessionLock, 0)
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if wac.session == nil {
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return ErrInvalidSession
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}
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if err := wac.connect(); err != nil && err != ErrAlreadyConnected {
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return err
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}
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if wac.loggedIn {
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return ErrAlreadyLoggedIn
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}
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//listener for Conn or challenge; s1 is not allowed to drop
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s1 := make(chan string, 1)
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wac.listener.Lock()
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wac.listener.m["s1"] = s1
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wac.listener.Unlock()
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//admin init
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init := []interface{}{"admin", "init", waVersion, []string{wac.longClientName, wac.shortClientName}, wac.session.ClientId, true}
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initChan, err := wac.writeJson(init)
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if err != nil {
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return fmt.Errorf("error writing admin init: %v\n", err)
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}
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//admin login with takeover
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login := []interface{}{"admin", "login", wac.session.ClientToken, wac.session.ServerToken, wac.session.ClientId, "takeover"}
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loginChan, err := wac.writeJson(login)
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if err != nil {
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return fmt.Errorf("error writing admin login: %v\n", err)
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}
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select {
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case r := <-initChan:
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var resp map[string]interface{}
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if err = json.Unmarshal([]byte(r), &resp); err != nil {
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return fmt.Errorf("error decoding login connResp: %v\n", err)
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}
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if int(resp["status"].(float64)) != 200 {
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return fmt.Errorf("init responded with %d", resp["status"])
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}
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case <-time.After(wac.msgTimeout):
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return fmt.Errorf("restore session init timed out")
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}
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//wait for s1
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var connResp []interface{}
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select {
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case r1 := <-s1:
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if err := json.Unmarshal([]byte(r1), &connResp); err != nil {
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return fmt.Errorf("error decoding s1 message: %v\n", err)
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}
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case <-time.After(wac.msgTimeout):
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//check for an error message
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select {
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case r := <-loginChan:
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var resp map[string]interface{}
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if err = json.Unmarshal([]byte(r), &resp); err != nil {
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return fmt.Errorf("error decoding login connResp: %v\n", err)
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}
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if int(resp["status"].(float64)) != 200 {
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return fmt.Errorf("admin login responded with %d", int(resp["status"].(float64)))
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}
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default:
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// not even an error message – assume timeout
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return fmt.Errorf("restore session connection timed out")
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}
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}
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//check if challenge is present
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if len(connResp) == 2 && connResp[0] == "Cmd" && connResp[1].(map[string]interface{})["type"] == "challenge" {
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s2 := make(chan string, 1)
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wac.listener.Lock()
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wac.listener.m["s2"] = s2
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wac.listener.Unlock()
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if err := wac.resolveChallenge(connResp[1].(map[string]interface{})["challenge"].(string)); err != nil {
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return fmt.Errorf("error resolving challenge: %v\n", err)
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}
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select {
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case r := <-s2:
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if err := json.Unmarshal([]byte(r), &connResp); err != nil {
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return fmt.Errorf("error decoding s2 message: %v\n", err)
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}
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case <-time.After(wac.msgTimeout):
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return fmt.Errorf("restore session challenge timed out")
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}
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}
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//check for login 200 --> login success
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select {
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case r := <-loginChan:
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var resp map[string]interface{}
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if err = json.Unmarshal([]byte(r), &resp); err != nil {
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return fmt.Errorf("error decoding login connResp: %v\n", err)
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}
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if int(resp["status"].(float64)) != 200 {
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return fmt.Errorf("admin login responded with %d", resp["status"])
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}
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case <-time.After(wac.msgTimeout):
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return fmt.Errorf("restore session login timed out")
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}
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info := connResp[1].(map[string]interface{})
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wac.Info = newInfoFromReq(info)
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//set new tokens
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wac.session.ClientToken = info["clientToken"].(string)
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wac.session.ServerToken = info["serverToken"].(string)
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wac.session.Wid = info["wid"].(string)
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wac.loggedIn = true
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return nil
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}
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func (wac *Conn) resolveChallenge(challenge string) error {
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decoded, err := base64.StdEncoding.DecodeString(challenge)
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if err != nil {
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return err
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}
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h2 := hmac.New(sha256.New, wac.session.MacKey)
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h2.Write([]byte(decoded))
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ch := []interface{}{"admin", "challenge", base64.StdEncoding.EncodeToString(h2.Sum(nil)), wac.session.ServerToken, wac.session.ClientId}
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challengeChan, err := wac.writeJson(ch)
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if err != nil {
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return fmt.Errorf("error writing challenge: %v\n", err)
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}
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select {
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case r := <-challengeChan:
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var resp map[string]interface{}
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if err := json.Unmarshal([]byte(r), &resp); err != nil {
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return fmt.Errorf("error decoding login resp: %v\n", err)
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}
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if int(resp["status"].(float64)) != 200 {
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return fmt.Errorf("challenge responded with %d\n", resp["status"])
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}
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case <-time.After(wac.msgTimeout):
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return fmt.Errorf("connection timed out")
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}
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return nil
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}
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/*
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Logout is the function to logout from a WhatsApp session. Logging out means invalidating the current session.
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The session can not be resumed and will disappear on your phone in the WhatsAppWeb client list.
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*/
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func (wac *Conn) Logout() error {
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login := []interface{}{"admin", "Conn", "disconnect"}
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_, err := wac.writeJson(login)
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if err != nil {
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return fmt.Errorf("error writing logout: %v\n", err)
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}
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return nil
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}
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