mirror of
https://github.com/42wim/matterbridge
synced 2024-11-03 15:40:24 +00:00
275 lines
8.9 KiB
Go
275 lines
8.9 KiB
Go
// Copyright (c) 2021 Tulir Asokan
|
|
//
|
|
// This Source Code Form is subject to the terms of the Mozilla Public
|
|
// License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
|
|
|
|
package whatsmeow
|
|
|
|
import (
|
|
"encoding/binary"
|
|
"fmt"
|
|
"time"
|
|
|
|
"go.mau.fi/libsignal/ecc"
|
|
"go.mau.fi/libsignal/groups"
|
|
"go.mau.fi/libsignal/keys/prekey"
|
|
"go.mau.fi/libsignal/protocol"
|
|
"google.golang.org/protobuf/proto"
|
|
|
|
waBinary "go.mau.fi/whatsmeow/binary"
|
|
waProto "go.mau.fi/whatsmeow/binary/proto"
|
|
"go.mau.fi/whatsmeow/types"
|
|
"go.mau.fi/whatsmeow/types/events"
|
|
)
|
|
|
|
// Number of sent messages to cache in memory for handling retry receipts.
|
|
const recentMessagesSize = 256
|
|
|
|
type recentMessageKey struct {
|
|
To types.JID
|
|
ID types.MessageID
|
|
}
|
|
|
|
// RecentMessage contains the info needed to re-send a message when another device fails to decrypt it.
|
|
type RecentMessage struct {
|
|
Proto *waProto.Message
|
|
Timestamp time.Time
|
|
}
|
|
|
|
func (cli *Client) addRecentMessage(to types.JID, id types.MessageID, message *waProto.Message) {
|
|
cli.recentMessagesLock.Lock()
|
|
key := recentMessageKey{to, id}
|
|
if cli.recentMessagesList[cli.recentMessagesPtr].ID != "" {
|
|
delete(cli.recentMessagesMap, cli.recentMessagesList[cli.recentMessagesPtr])
|
|
}
|
|
cli.recentMessagesMap[key] = message
|
|
cli.recentMessagesList[cli.recentMessagesPtr] = key
|
|
cli.recentMessagesPtr++
|
|
if cli.recentMessagesPtr >= len(cli.recentMessagesList) {
|
|
cli.recentMessagesPtr = 0
|
|
}
|
|
cli.recentMessagesLock.Unlock()
|
|
}
|
|
|
|
func (cli *Client) getRecentMessage(to types.JID, id types.MessageID) *waProto.Message {
|
|
cli.recentMessagesLock.RLock()
|
|
msg, _ := cli.recentMessagesMap[recentMessageKey{to, id}]
|
|
cli.recentMessagesLock.RUnlock()
|
|
return msg
|
|
}
|
|
|
|
func (cli *Client) getMessageForRetry(receipt *events.Receipt, messageID types.MessageID) (*waProto.Message, error) {
|
|
msg := cli.getRecentMessage(receipt.Chat, messageID)
|
|
if msg == nil {
|
|
msg = cli.GetMessageForRetry(receipt.Chat, messageID)
|
|
if msg == nil {
|
|
return nil, fmt.Errorf("couldn't find message %s", messageID)
|
|
} else {
|
|
cli.Log.Debugf("Found message in GetMessageForRetry to accept retry receipt for %s/%s from %s", receipt.Chat, messageID, receipt.Sender)
|
|
}
|
|
} else {
|
|
cli.Log.Debugf("Found message in local cache to accept retry receipt for %s/%s from %s", receipt.Chat, messageID, receipt.Sender)
|
|
}
|
|
return proto.Clone(msg).(*waProto.Message), nil
|
|
}
|
|
|
|
// handleRetryReceipt handles an incoming retry receipt for an outgoing message.
|
|
func (cli *Client) handleRetryReceipt(receipt *events.Receipt, node *waBinary.Node) error {
|
|
retryChild, ok := node.GetOptionalChildByTag("retry")
|
|
if !ok {
|
|
return &ElementMissingError{Tag: "retry", In: "retry receipt"}
|
|
}
|
|
ag := retryChild.AttrGetter()
|
|
messageID := ag.String("id")
|
|
timestamp := time.Unix(ag.Int64("t"), 0)
|
|
retryCount := ag.Int("count")
|
|
if !ag.OK() {
|
|
return ag.Error()
|
|
}
|
|
msg, err := cli.getMessageForRetry(receipt, messageID)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if receipt.IsGroup {
|
|
builder := groups.NewGroupSessionBuilder(cli.Store, pbSerializer)
|
|
senderKeyName := protocol.NewSenderKeyName(receipt.Chat.String(), cli.Store.ID.SignalAddress())
|
|
signalSKDMessage, err := builder.Create(senderKeyName)
|
|
if err != nil {
|
|
cli.Log.Warnf("Failed to create sender key distribution message to include in retry of %s in %s to %s: %v", messageID, receipt.Chat, receipt.Sender, err)
|
|
} else {
|
|
msg.SenderKeyDistributionMessage = &waProto.SenderKeyDistributionMessage{
|
|
GroupId: proto.String(receipt.Chat.String()),
|
|
AxolotlSenderKeyDistributionMessage: signalSKDMessage.Serialize(),
|
|
}
|
|
}
|
|
} else if receipt.IsFromMe {
|
|
msg = &waProto.Message{
|
|
DeviceSentMessage: &waProto.DeviceSentMessage{
|
|
DestinationJid: proto.String(receipt.Chat.String()),
|
|
Message: msg,
|
|
},
|
|
}
|
|
}
|
|
|
|
if cli.PreRetryCallback != nil && !cli.PreRetryCallback(receipt, retryCount, msg) {
|
|
cli.Log.Debugf("Cancelled retry receipt in PreRetryCallback")
|
|
return nil
|
|
}
|
|
|
|
plaintext, err := proto.Marshal(msg)
|
|
if err != nil {
|
|
return fmt.Errorf("failed to marshal message: %w", err)
|
|
}
|
|
_, hasKeys := node.GetOptionalChildByTag("keys")
|
|
var bundle *prekey.Bundle
|
|
if hasKeys {
|
|
bundle, err = nodeToPreKeyBundle(uint32(receipt.Sender.Device), *node)
|
|
if err != nil {
|
|
return fmt.Errorf("failed to read prekey bundle in retry receipt: %w", err)
|
|
}
|
|
} else if retryCount >= 2 || !cli.Store.ContainsSession(receipt.Sender.SignalAddress()) {
|
|
if retryCount >= 2 {
|
|
cli.Log.Debugf("Fetching prekeys for %s due to retry receipt with count>1 but no prekey bundle", receipt.Sender)
|
|
} else {
|
|
cli.Log.Debugf("Fetching prekeys for %s for handling retry receipt because we don't have a Signal session with them", receipt.Sender)
|
|
}
|
|
var keys map[types.JID]preKeyResp
|
|
keys, err = cli.fetchPreKeys([]types.JID{receipt.Sender})
|
|
if err != nil {
|
|
return err
|
|
}
|
|
senderAD := receipt.Sender
|
|
senderAD.AD = true
|
|
bundle, err = keys[senderAD].bundle, keys[senderAD].err
|
|
if err != nil {
|
|
return fmt.Errorf("failed to fetch prekeys: %w", err)
|
|
} else if bundle == nil {
|
|
return fmt.Errorf("didn't get prekey bundle for %s (response size: %d)", senderAD, len(keys))
|
|
}
|
|
if retryCount > 3 {
|
|
cli.Log.Debugf("Erasing existing session for %s due to retry receipt with count>3", receipt.Sender)
|
|
err = cli.Store.Sessions.DeleteSession(receipt.Sender.SignalAddress().String())
|
|
if err != nil {
|
|
return fmt.Errorf("failed to delete session for %s: %w", senderAD, err)
|
|
}
|
|
}
|
|
}
|
|
encrypted, includeDeviceIdentity, err := cli.encryptMessageForDevice(plaintext, receipt.Sender, bundle)
|
|
if err != nil {
|
|
return fmt.Errorf("failed to encrypt message for retry: %w", err)
|
|
}
|
|
encrypted.Attrs["count"] = retryCount
|
|
|
|
attrs := waBinary.Attrs{
|
|
"to": node.Attrs["from"],
|
|
"type": "text",
|
|
"id": messageID,
|
|
"t": timestamp.Unix(),
|
|
}
|
|
if !receipt.IsGroup {
|
|
attrs["device_fanout"] = false
|
|
}
|
|
if participant, ok := node.Attrs["participant"]; ok {
|
|
attrs["participant"] = participant
|
|
}
|
|
if recipient, ok := node.Attrs["recipient"]; ok {
|
|
attrs["recipient"] = recipient
|
|
}
|
|
if edit, ok := node.Attrs["edit"]; ok {
|
|
attrs["edit"] = edit
|
|
}
|
|
req := waBinary.Node{
|
|
Tag: "message",
|
|
Attrs: attrs,
|
|
Content: []waBinary.Node{*encrypted},
|
|
}
|
|
if includeDeviceIdentity {
|
|
err = cli.appendDeviceIdentityNode(&req)
|
|
if err != nil {
|
|
return fmt.Errorf("failed to add device identity to retry message: %w", err)
|
|
}
|
|
}
|
|
err = cli.sendNode(req)
|
|
if err != nil {
|
|
return fmt.Errorf("failed to send retry message: %w", err)
|
|
}
|
|
cli.Log.Debugf("Sent retry #%d for %s/%s to %s", retryCount, receipt.Chat, messageID, receipt.Sender)
|
|
return nil
|
|
}
|
|
|
|
// sendRetryReceipt sends a retry receipt for an incoming message.
|
|
func (cli *Client) sendRetryReceipt(node *waBinary.Node, forceIncludeIdentity bool) {
|
|
id, _ := node.Attrs["id"].(string)
|
|
children := node.GetChildren()
|
|
var retryCountInMsg int
|
|
if len(children) == 1 && children[0].Tag == "enc" {
|
|
retryCountInMsg = children[0].AttrGetter().OptionalInt("count")
|
|
}
|
|
|
|
cli.messageRetriesLock.Lock()
|
|
cli.messageRetries[id]++
|
|
retryCount := cli.messageRetries[id]
|
|
// In case the message is a retry response, and we restarted in between, find the count from the message
|
|
if retryCount == 1 && retryCountInMsg > 0 {
|
|
retryCount = retryCountInMsg + 1
|
|
cli.messageRetries[id] = retryCount
|
|
}
|
|
cli.messageRetriesLock.Unlock()
|
|
if retryCount >= 5 {
|
|
cli.Log.Warnf("Not sending any more retry receipts for %s", id)
|
|
return
|
|
}
|
|
|
|
var registrationIDBytes [4]byte
|
|
binary.BigEndian.PutUint32(registrationIDBytes[:], cli.Store.RegistrationID)
|
|
attrs := waBinary.Attrs{
|
|
"id": id,
|
|
"type": "retry",
|
|
"to": node.Attrs["from"],
|
|
}
|
|
if recipient, ok := node.Attrs["recipient"]; ok {
|
|
attrs["recipient"] = recipient
|
|
}
|
|
if participant, ok := node.Attrs["participant"]; ok {
|
|
attrs["participant"] = participant
|
|
}
|
|
payload := waBinary.Node{
|
|
Tag: "receipt",
|
|
Attrs: attrs,
|
|
Content: []waBinary.Node{
|
|
{Tag: "retry", Attrs: waBinary.Attrs{
|
|
"count": retryCount,
|
|
"id": id,
|
|
"t": node.Attrs["t"],
|
|
"v": 1,
|
|
}},
|
|
{Tag: "registration", Content: registrationIDBytes[:]},
|
|
},
|
|
}
|
|
if retryCount > 1 || forceIncludeIdentity {
|
|
if key, err := cli.Store.PreKeys.GenOnePreKey(); err != nil {
|
|
cli.Log.Errorf("Failed to get prekey for retry receipt: %v", err)
|
|
} else if deviceIdentity, err := proto.Marshal(cli.Store.Account); err != nil {
|
|
cli.Log.Errorf("Failed to marshal account info: %v", err)
|
|
return
|
|
} else {
|
|
payload.Content = append(payload.GetChildren(), waBinary.Node{
|
|
Tag: "keys",
|
|
Content: []waBinary.Node{
|
|
{Tag: "type", Content: []byte{ecc.DjbType}},
|
|
{Tag: "identity", Content: cli.Store.IdentityKey.Pub[:]},
|
|
preKeyToNode(key),
|
|
preKeyToNode(cli.Store.SignedPreKey),
|
|
{Tag: "device-identity", Content: deviceIdentity},
|
|
},
|
|
})
|
|
}
|
|
}
|
|
err := cli.sendNode(payload)
|
|
if err != nil {
|
|
cli.Log.Errorf("Failed to send retry receipt for %s: %v", id, err)
|
|
}
|
|
}
|