gmessages/libgm/client.go

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package libgm
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import (
"crypto/ecdsa"
"crypto/rand"
"crypto/sha256"
"fmt"
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"io"
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"net"
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"net/http"
"net/url"
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"sync"
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"time"
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"github.com/google/uuid"
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"github.com/rs/zerolog"
"go.mau.fi/mautrix-gmessages/libgm/crypto"
"go.mau.fi/mautrix-gmessages/libgm/events"
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"go.mau.fi/mautrix-gmessages/libgm/gmproto"
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"go.mau.fi/mautrix-gmessages/libgm/util"
)
type AuthData struct {
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// Keys used to encrypt communication with the phone
RequestCrypto *crypto.AESCTRHelper `json:"request_crypto,omitempty"`
// Key used to sign requests to refresh the tachyon auth token from the server
RefreshKey *crypto.JWK `json:"refresh_key,omitempty"`
// Identity of the paired phone and browser
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Browser *gmproto.Device `json:"browser,omitempty"`
Mobile *gmproto.Device `json:"mobile,omitempty"`
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// Key used to authenticate with the server
TachyonAuthToken []byte `json:"tachyon_token,omitempty"`
TachyonExpiry time.Time `json:"tachyon_expiry,omitempty"`
TachyonTTL int64 `json:"tachyon_ttl,omitempty"`
// Unknown encryption key, not used for anything
WebEncryptionKey []byte `json:"web_encryption_key,omitempty"`
SessionID uuid.UUID `json:"session_id,omitempty"`
DestRegID uuid.UUID `json:"dest_reg_id,omitempty"`
PairingID uuid.UUID `json:"pairing_id,omitempty"`
Cookies map[string]string `json:"cookies,omitempty"`
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}
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func (ad *AuthData) AuthNetwork() string {
if ad.Cookies != nil {
return util.GoogleNetwork
}
return ""
}
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const RefreshTachyonBuffer = 1 * time.Hour
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type Proxy func(*http.Request) (*url.URL, error)
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type EventHandler func(evt any)
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type updateDedupItem struct {
id string
hash [32]byte
}
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type Client struct {
Logger zerolog.Logger
evHandler EventHandler
sessionHandler *SessionHandler
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longPollingConn io.Closer
listenID int
skipCount int
disconnecting bool
pingShortCircuit chan struct{}
nextDataReceiveCheck time.Time
nextDataReceiveCheckLock sync.Mutex
recentUpdates [8]updateDedupItem
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recentUpdatesPtr int
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conversationsFetchedOnce bool
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AuthData *AuthData
cfg *gmproto.Config
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httpTransport *http.Transport
http *http.Client
lphttp *http.Client
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}
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func NewAuthData() *AuthData {
return &AuthData{
RequestCrypto: crypto.NewAESCTRHelper(),
RefreshKey: crypto.GenerateECDSAKey(),
}
}
func NewClient(authData *AuthData, logger zerolog.Logger) *Client {
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sessionHandler := &SessionHandler{
responseWaiters: make(map[string]chan<- *IncomingRPCMessage),
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}
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transport := &http.Transport{
DialContext: (&net.Dialer{Timeout: 10 * time.Second}).DialContext,
TLSHandshakeTimeout: 10 * time.Second,
ResponseHeaderTimeout: 20 * time.Second,
}
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cli := &Client{
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AuthData: authData,
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Logger: logger,
sessionHandler: sessionHandler,
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httpTransport: transport,
http: &http.Client{Transport: transport, Timeout: 2 * time.Minute},
lphttp: &http.Client{Transport: transport, Timeout: 30 * time.Minute},
pingShortCircuit: make(chan struct{}),
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}
sessionHandler.client = cli
var err error
cli.cfg, err = cli.FetchConfig()
if err != nil {
cli.Logger.Err(err).Msg("Failed to fetch web config")
} else if deviceID := cli.cfg.GetDeviceInfo().GetDeviceID(); deviceID != "" {
authData.SessionID, err = uuid.Parse(deviceID)
if err != nil {
cli.Logger.Err(err).Str("device_id", deviceID).Msg("Failed to parse device ID")
}
}
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return cli
}
func (c *Client) CurrentSessionID() string {
return c.sessionHandler.sessionID
}
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func (c *Client) SetEventHandler(eventHandler EventHandler) {
c.evHandler = eventHandler
}
func (c *Client) SetProxy(proxy string) error {
proxyParsed, err := url.Parse(proxy)
if err != nil {
c.Logger.Fatal().Err(err).Msg("Failed to set proxy")
}
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c.httpTransport.Proxy = http.ProxyURL(proxyParsed)
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c.Logger.Debug().Any("proxy", proxyParsed.Host).Msg("SetProxy")
return nil
}
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func (c *Client) Connect() error {
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if c.AuthData.TachyonAuthToken == nil {
return fmt.Errorf("no auth token")
} else if c.AuthData.Browser == nil {
return fmt.Errorf("not logged in")
}
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err := c.refreshAuthToken()
if err != nil {
return fmt.Errorf("failed to refresh auth token: %w", err)
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}
c.bumpNextDataReceiveCheck(10 * time.Minute)
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//webEncryptionKeyResponse, err := c.GetWebEncryptionKey()
//if err != nil {
// return fmt.Errorf("failed to get web encryption key: %w", err)
//}
//c.updateWebEncryptionKey(webEncryptionKeyResponse.GetKey())
go c.doLongPoll(true, c.postConnect)
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c.sessionHandler.startAckInterval()
return nil
}
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func (c *Client) postConnect() {
time.Sleep(2 * time.Second)
if c.skipCount > 0 {
c.Logger.Warn().Int("skip_count", c.skipCount).Msg("Skip count is non-zero in postConnect, waiting longer")
for i := 0; i < 3 && c.skipCount > 0; i++ {
time.Sleep(1 * time.Second)
}
if c.skipCount > 0 {
c.Logger.Warn().Int("skip_count", c.skipCount).Msg("Skip count is still non-zero")
}
c.triggerEvent(&events.HackySetActiveMayFail{})
}
c.Logger.Debug().Msg("Sending acks before get updates request")
c.sessionHandler.sendAckRequest()
time.Sleep(1 * time.Second)
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c.Logger.Debug().Msg("Sending get updates request")
err := c.SetActiveSession()
if err != nil {
c.Logger.Err(err).Msg("Failed to set active session")
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c.triggerEvent(&events.PingFailed{
Error: fmt.Errorf("failed to set active session: %w", err),
})
return
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}
c.Logger.Debug().Msg("Sent set active session/get updates request")
doneChan := make(chan struct{})
go func() {
select {
case <-time.After(5 * time.Second):
c.Logger.Warn().Msg("Checking bugle default on connect is taking long")
case <-doneChan:
}
}()
bugleRes, err := c.IsBugleDefault()
close(doneChan)
if err != nil {
c.Logger.Err(err).Msg("Failed to check bugle default")
return
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}
c.Logger.Debug().Bool("bugle_default", bugleRes.Success).Msg("Got is bugle default response on connect")
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}
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func (c *Client) Disconnect() {
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c.closeLongPolling()
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c.http.CloseIdleConnections()
}
func (c *Client) IsConnected() bool {
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// TODO add better check (longPollingConn is set to nil while the polling reconnects)
return c.longPollingConn != nil
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}
func (c *Client) IsLoggedIn() bool {
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return c.AuthData != nil && c.AuthData.Browser != nil
}
func (c *Client) Reconnect() error {
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c.closeLongPolling()
err := c.Connect()
if err != nil {
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c.Logger.Err(err).Msg("Failed to reconnect")
return err
}
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c.Logger.Debug().Msg("Successfully reconnected to server")
return nil
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}
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func (c *Client) triggerEvent(evt interface{}) {
if c.evHandler != nil {
c.evHandler(evt)
}
}
func (c *Client) FetchConfig() (*gmproto.Config, error) {
req, err := http.NewRequest(http.MethodGet, util.ConfigURL, nil)
if err != nil {
return nil, fmt.Errorf("failed to prepare request: %w", err)
}
util.BuildRelayHeaders(req, "", "*/*")
req.Header.Set("sec-fetch-site", "same-origin")
req.Header.Del("x-user-agent")
req.Header.Del("origin")
c.AddCookieHeaders(req)
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resp, err := c.http.Do(req)
if resp != nil {
c.HandleCookieUpdates(resp)
}
config, err := typedHTTPResponse[*gmproto.Config](resp, err)
if err != nil {
return nil, err
}
version, parseErr := config.ParsedClientVersion()
if parseErr != nil {
return nil, fmt.Errorf("failed to parse client version: %w", err)
}
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currVersion := util.ConfigMessage
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if version.Year != currVersion.Year || version.Month != currVersion.Month || version.Day != currVersion.Day {
toLog := c.diffVersionFormat(currVersion, version)
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c.Logger.Trace().Any("version", toLog).Msg("Messages for web version is not latest")
} else {
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c.Logger.Debug().Any("version", currVersion).Msg("Using latest messages for web version")
}
return config, nil
}
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func (c *Client) diffVersionFormat(curr *gmproto.ConfigVersion, latest *gmproto.ConfigVersion) string {
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return fmt.Sprintf("%d.%d.%d -> %d.%d.%d", curr.Year, curr.Month, curr.Day, latest.Year, latest.Month, latest.Day)
}
func (c *Client) updateWebEncryptionKey(key []byte) {
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c.Logger.Debug().Msg("Updated WebEncryptionKey")
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c.AuthData.WebEncryptionKey = key
}
func (c *Client) updateTachyonAuthToken(data *gmproto.TokenData) {
c.AuthData.TachyonAuthToken = data.GetTachyonAuthToken()
validForDuration := time.Duration(data.GetTTL()) * time.Microsecond
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if validForDuration == 0 {
validForDuration = 24 * time.Hour
}
c.AuthData.TachyonExpiry = time.Now().UTC().Add(validForDuration)
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c.AuthData.TachyonTTL = validForDuration.Microseconds()
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c.Logger.Debug().
Time("tachyon_expiry", c.AuthData.TachyonExpiry).
Int64("valid_for", data.GetTTL()).
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Msg("Updated tachyon token")
}
func (c *Client) refreshAuthToken() error {
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if c.AuthData.Browser == nil || time.Until(c.AuthData.TachyonExpiry) > RefreshTachyonBuffer {
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return nil
}
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c.Logger.Debug().
Time("tachyon_expiry", c.AuthData.TachyonExpiry).
Msg("Refreshing auth token")
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jwk := c.AuthData.RefreshKey
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requestID := uuid.NewString()
timestamp := time.Now().UnixMilli() * 1000
signBytes := sha256.Sum256([]byte(fmt.Sprintf("%s:%d", requestID, timestamp)))
sig, err := ecdsa.SignASN1(rand.Reader, jwk.GetPrivateKey(), signBytes[:])
if err != nil {
return err
}
payload := &gmproto.RegisterRefreshRequest{
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MessageAuth: &gmproto.AuthMessage{
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RequestID: requestID,
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TachyonAuthToken: c.AuthData.TachyonAuthToken,
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Network: c.AuthData.AuthNetwork(),
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ConfigVersion: util.ConfigMessage,
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},
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CurrBrowserDevice: c.AuthData.Browser,
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UnixTimestamp: timestamp,
Signature: sig,
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EmptyRefreshArr: &gmproto.RegisterRefreshRequest_NestedEmptyArr{EmptyArr: &gmproto.EmptyArr{}},
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MessageType: 2, // hmm
}
resp, err := typedHTTPResponse[*gmproto.RegisterRefreshResponse](
c.makeProtobufHTTPRequest(util.RegisterRefreshURL, payload, ContentTypePBLite),
)
if err != nil {
return err
}
if resp.GetTokenData().GetTachyonAuthToken() == nil {
return fmt.Errorf("no tachyon auth token in refresh response")
}
c.updateTachyonAuthToken(resp.GetTokenData())
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c.triggerEvent(&events.AuthTokenRefreshed{})
return nil
}