forked from lug/matterbridge
112 lines
2.7 KiB
Go
112 lines
2.7 KiB
Go
package whatsapp
|
|
|
|
import (
|
|
"crypto/hmac"
|
|
"crypto/sha256"
|
|
"github.com/Rhymen/go-whatsapp/binary"
|
|
"github.com/Rhymen/go-whatsapp/crypto/cbc"
|
|
"github.com/gorilla/websocket"
|
|
"github.com/pkg/errors"
|
|
"io"
|
|
"io/ioutil"
|
|
"strings"
|
|
)
|
|
|
|
func (wac *Conn) readPump() {
|
|
defer wac.wg.Done()
|
|
|
|
var readErr error
|
|
var msgType int
|
|
var reader io.Reader
|
|
|
|
for {
|
|
readerFound := make(chan struct{})
|
|
go func() {
|
|
msgType, reader, readErr = wac.ws.conn.NextReader()
|
|
close(readerFound)
|
|
}()
|
|
select {
|
|
case <-readerFound:
|
|
if readErr != nil {
|
|
wac.handle(&ErrConnectionFailed{Err: readErr})
|
|
_, _ = wac.Disconnect()
|
|
return
|
|
}
|
|
msg, err := ioutil.ReadAll(reader)
|
|
if err != nil {
|
|
wac.handle(errors.Wrap(err, "error reading message from Reader"))
|
|
continue
|
|
}
|
|
err = wac.processReadData(msgType, msg)
|
|
if err != nil {
|
|
wac.handle(errors.Wrap(err, "error processing data"))
|
|
}
|
|
case <-wac.ws.close:
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
func (wac *Conn) processReadData(msgType int, msg []byte) error {
|
|
data := strings.SplitN(string(msg), ",", 2)
|
|
|
|
if data[0][0] == '!' { //Keep-Alive Timestamp
|
|
data = append(data, data[0][1:]) //data[1]
|
|
data[0] = "!"
|
|
}
|
|
|
|
if len(data) != 2 || len(data[1]) == 0 {
|
|
return ErrInvalidWsData
|
|
}
|
|
|
|
wac.listener.RLock()
|
|
listener, hasListener := wac.listener.m[data[0]]
|
|
wac.listener.RUnlock()
|
|
|
|
if hasListener {
|
|
// listener only exists for TextMessages query messages out of contact.go
|
|
// If these binary query messages can be handled another way,
|
|
// then the TextMessages, which are all JSON encoded, can directly
|
|
// be unmarshalled. The listener chan could then be changed from type
|
|
// chan string to something like chan map[string]interface{}. The unmarshalling
|
|
// in several places, especially in session.go, would then be gone.
|
|
listener <- data[1]
|
|
|
|
wac.listener.Lock()
|
|
delete(wac.listener.m, data[0])
|
|
wac.listener.Unlock()
|
|
} else if msgType == websocket.BinaryMessage && wac.loggedIn {
|
|
message, err := wac.decryptBinaryMessage([]byte(data[1]))
|
|
if err != nil {
|
|
return errors.Wrap(err, "error decoding binary")
|
|
}
|
|
wac.dispatch(message)
|
|
} else { //RAW json status updates
|
|
wac.handle(string(data[1]))
|
|
}
|
|
return nil
|
|
}
|
|
|
|
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, ErrInvalidHmac
|
|
}
|
|
|
|
// message decrypt
|
|
d, err := cbc.Decrypt(wac.session.EncKey, nil, msg[32:])
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "decrypting message with AES-CBC failed")
|
|
}
|
|
|
|
// message unmarshal
|
|
message, err := binary.Unmarshal(d)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not decode binary")
|
|
}
|
|
|
|
return message, nil
|
|
}
|