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package whatsapp
import (
"crypto/hmac"
"crypto/sha256"
"encoding/json"
"fmt"
"github.com/Rhymen/go-whatsapp/binary"
"github.com/Rhymen/go-whatsapp/crypto/cbc"
"github.com/gorilla/websocket"
"github.com/pkg/errors"
"strconv"
"time"
)
//writeJson enqueues a json message into the writeChan
func (wac *Conn) writeJson(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)
bytes := []byte(fmt.Sprintf("%s,%s", messageTag, d))
ch, err := wac.write(websocket.TextMessage, messageTag, bytes)
if err != nil {
return nil, err
}
wac.msgCount++
return ch, nil
}
func (wac *Conn) writeBinary(node binary.Node, metric metric, flag flag, messageTag string) (<-chan string, error) {
if len(messageTag) < 2 {
return nil, ErrMissingMessageTag
}
data, err := wac.encryptBinaryMessage(node)
if err != nil {
return nil, errors.Wrap(err, "encryptBinaryMessage(node) failed")
}
bytes := []byte(messageTag + ",")
bytes = append(bytes, byte(metric), byte(flag))
bytes = append(bytes, data...)
ch, err := wac.write(websocket.BinaryMessage, messageTag, bytes)
if err != nil {
return nil, errors.Wrap(err, "failed to write message")
}
wac.msgCount++
return ch, nil
}
func (wac *Conn) sendKeepAlive() error {
bytes := []byte("?,,")
respChan, err := wac.write(websocket.TextMessage, "!", bytes)
if err != nil {
return errors.Wrap(err, "error sending keepAlive")
}
select {
case resp := <-respChan:
msecs, err := strconv.ParseInt(resp, 10, 64)
if err != nil {
return errors.Wrap(err, "Error converting time string to uint")
}
wac.ServerLastSeen = time.Unix(msecs/1000, (msecs%1000)*int64(time.Millisecond))
case <-time.After(wac.msgTimeout):
return ErrConnectionTimeout
}
return nil
}
func (wac *Conn) write(messageType int, answerMessageTag string, data []byte) (<-chan string, error) {
var ch chan string
if answerMessageTag != "" {
ch = make(chan string, 1)
wac.listener.Lock()
wac.listener.m[answerMessageTag] = ch
wac.listener.Unlock()
}
wac.ws.Lock()
err := wac.ws.conn.WriteMessage(messageType, data)
wac.ws.Unlock()
if err != nil {
if answerMessageTag != "" {
wac.listener.Lock()
delete(wac.listener.m, answerMessageTag)
wac.listener.Unlock()
}
return nil, errors.Wrap(err, "error writing to websocket")
}
return ch, nil
}
func (wac *Conn) encryptBinaryMessage(node binary.Node) (data []byte, err error) {
b, err := binary.Marshal(node)
if err != nil {
return nil, errors.Wrap(err, "binary node marshal failed")
}
cipher, err := cbc.Encrypt(wac.session.EncKey, nil, b)
if err != nil {
return nil, errors.Wrap(err, "encrypt failed")
}
h := hmac.New(sha256.New, wac.session.MacKey)
h.Write(cipher)
hash := h.Sum(nil)
data = append(data, hash[:32]...)
data = append(data, cipher...)
return data, nil
}
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