1 files changed, 125 insertions, 0 deletions
diff --git a/vendor/github.com/Rhymen/go-whatsapp/write.go b/vendor/github.com/Rhymen/go-whatsapp/write.go
new file mode 100644
index 00000000..4ea63dca
--- /dev/null
+++ b/vendor/github.com/Rhymen/go-whatsapp/write.go
@@ -0,0 +1,125 @@
+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
+}