From 496d5b4ec7f5f4afae6199f928675d14d18de015 Mon Sep 17 00:00:00 2001
From: Wim <wim@42.be>
Date: Sun, 20 Mar 2022 02:20:54 +0100
Subject: Add whatsappmulti buildflag for whatsapp with multidevice support
 (whatsapp)

---
 vendor/github.com/Rhymen/go-whatsapp/write.go | 195 ++++++++++++++++++++++++++
 1 file changed, 195 insertions(+)
 create mode 100644 vendor/github.com/Rhymen/go-whatsapp/write.go

(limited to 'vendor/github.com/Rhymen/go-whatsapp/write.go')

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..e427825c
--- /dev/null
+++ b/vendor/github.com/Rhymen/go-whatsapp/write.go
@@ -0,0 +1,195 @@
+package whatsapp
+
+import (
+	"crypto/hmac"
+	"crypto/sha256"
+	"encoding/json"
+	"fmt"
+	"strconv"
+
+	"time"
+
+	"github.com/Rhymen/go-whatsapp/binary"
+	"github.com/Rhymen/go-whatsapp/crypto/cbc"
+	"github.com/gorilla/websocket"
+	"github.com/pkg/errors"
+)
+
+func (wac *Conn) addListener(ch chan string, messageTag string) {
+	wac.listener.Lock()
+	wac.listener.m[messageTag] = ch
+	wac.listener.Unlock()
+}
+
+func (wac *Conn) removeListener(answerMessageTag string) {
+	wac.listener.Lock()
+	delete(wac.listener.m, answerMessageTag)
+	wac.listener.Unlock()
+}
+
+//writeJson enqueues a json message into the writeChan
+func (wac *Conn) writeJson(data []interface{}) (<-chan string, error) {
+
+	ch := make(chan string, 1)
+
+	wac.writerLock.Lock()
+	defer wac.writerLock.Unlock()
+
+	d, err := json.Marshal(data)
+	if err != nil {
+		close(ch)
+		return ch, err
+	}
+
+	ts := time.Now().Unix()
+	messageTag := fmt.Sprintf("%d.--%d", ts, wac.msgCount)
+	bytes := []byte(fmt.Sprintf("%s,%s", messageTag, d))
+
+	if wac.timeTag == "" {
+		tss := fmt.Sprintf("%d", ts)
+		wac.timeTag = tss[len(tss)-3:]
+	}
+
+	wac.addListener(ch, messageTag)
+
+	err = wac.write(websocket.TextMessage, bytes)
+	if err != nil {
+		close(ch)
+		wac.removeListener(messageTag)
+		return ch, err
+	}
+
+	wac.msgCount++
+	return ch, nil
+}
+
+func (wac *Conn) writeBinary(node binary.Node, metric metric, flag flag, messageTag string) (<-chan string, error) {
+
+	ch := make(chan string, 1)
+
+	if len(messageTag) < 2 {
+		close(ch)
+		return ch, ErrMissingMessageTag
+	}
+
+	wac.writerLock.Lock()
+	defer wac.writerLock.Unlock()
+
+	data, err := wac.encryptBinaryMessage(node)
+	if err != nil {
+		close(ch)
+		return ch, errors.Wrap(err, "encryptBinaryMessage(node) failed")
+	}
+
+	bytes := []byte(messageTag + ",")
+	bytes = append(bytes, byte(metric), byte(flag))
+	bytes = append(bytes, data...)
+
+	wac.addListener(ch, messageTag)
+
+	err = wac.write(websocket.BinaryMessage, bytes)
+	if err != nil {
+		close(ch)
+		wac.removeListener(messageTag)
+		return ch, errors.Wrap(err, "failed to write message")
+	}
+
+	wac.msgCount++
+	return ch, nil
+}
+
+func (wac *Conn) sendKeepAlive() error {
+
+	respChan := make(chan string, 1)
+	wac.addListener(respChan, "!")
+
+	bytes := []byte("?,,")
+	err := wac.write(websocket.TextMessage, bytes)
+	if err != nil {
+		close(respChan)
+		wac.removeListener("!")
+		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
+}
+
+/*
+	When phone is unreachable, WhatsAppWeb sends ["admin","test"] time after time to try a successful contact.
+	Tested with Airplane mode and no connection at all.
+*/
+func (wac *Conn) sendAdminTest() (bool, error) {
+	data := []interface{}{"admin", "test"}
+
+	r, err := wac.writeJson(data)
+	if err != nil {
+		return false, errors.Wrap(err, "error sending admin test")
+	}
+
+	var response []interface{}
+
+	select {
+	case resp := <-r:
+		if err := json.Unmarshal([]byte(resp), &response); err != nil {
+			return false, fmt.Errorf("error decoding response message: %v\n", err)
+		}
+	case <-time.After(wac.msgTimeout):
+		return false, ErrConnectionTimeout
+	}
+
+	if len(response) == 2 && response[0].(string) == "Pong" && response[1].(bool) == true {
+		return true, nil
+	} else {
+		return false, nil
+	}
+}
+
+func (wac *Conn) write(messageType int, data []byte) error {
+
+	if wac == nil || wac.ws == nil {
+		return ErrInvalidWebsocket
+	}
+
+	wac.ws.Lock()
+	err := wac.ws.conn.WriteMessage(messageType, data)
+	wac.ws.Unlock()
+
+	if err != nil {
+		return errors.Wrap(err, "error writing to websocket")
+	}
+
+	return 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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