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// 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 (
"errors"
"go.mau.fi/whatsmeow/appstate"
waBinary "go.mau.fi/whatsmeow/binary"
"go.mau.fi/whatsmeow/store"
"go.mau.fi/whatsmeow/types"
"go.mau.fi/whatsmeow/types/events"
)
func (cli *Client) handleEncryptNotification(node *waBinary.Node) {
from := node.AttrGetter().JID("from")
if from == types.ServerJID {
count := node.GetChildByTag("count")
ag := count.AttrGetter()
otksLeft := ag.Int("value")
if !ag.OK() {
cli.Log.Warnf("Didn't get number of OTKs left in encryption notification %s", node.XMLString())
return
}
cli.Log.Infof("Got prekey count from server: %s", node.XMLString())
if otksLeft < MinPreKeyCount {
cli.uploadPreKeys()
}
} else if _, ok := node.GetOptionalChildByTag("identity"); ok {
cli.Log.Debugf("Got identity change for %s: %s, deleting all identities/sessions for that number", from, node.XMLString())
err := cli.Store.Identities.DeleteAllIdentities(from.User)
if err != nil {
cli.Log.Warnf("Failed to delete all identities of %s from store after identity change: %v", from, err)
}
err = cli.Store.Sessions.DeleteAllSessions(from.User)
if err != nil {
cli.Log.Warnf("Failed to delete all sessions of %s from store after identity change: %v", from, err)
}
ts := node.AttrGetter().UnixTime("t")
cli.dispatchEvent(&events.IdentityChange{JID: from, Timestamp: ts})
} else {
cli.Log.Debugf("Got unknown encryption notification from server: %s", node.XMLString())
}
}
func (cli *Client) handleAppStateNotification(node *waBinary.Node) {
for _, collection := range node.GetChildrenByTag("collection") {
ag := collection.AttrGetter()
name := appstate.WAPatchName(ag.String("name"))
version := ag.Uint64("version")
cli.Log.Debugf("Got server sync notification that app state %s has updated to version %d", name, version)
err := cli.FetchAppState(name, false, false)
if errors.Is(err, ErrIQDisconnected) || errors.Is(err, ErrNotConnected) {
// There are some app state changes right before a remote logout, so stop syncing if we're disconnected.
cli.Log.Debugf("Failed to sync app state after notification: %v, not trying to sync other states", err)
return
} else if err != nil {
cli.Log.Errorf("Failed to sync app state after notification: %v", err)
}
}
}
func (cli *Client) handlePictureNotification(node *waBinary.Node) {
ts := node.AttrGetter().UnixTime("t")
for _, child := range node.GetChildren() {
ag := child.AttrGetter()
var evt events.Picture
evt.Timestamp = ts
evt.JID = ag.JID("jid")
evt.Author = ag.OptionalJIDOrEmpty("author")
if child.Tag == "delete" {
evt.Remove = true
} else if child.Tag == "add" {
evt.PictureID = ag.String("id")
} else if child.Tag == "set" {
// TODO sometimes there's a hash and no ID?
evt.PictureID = ag.String("id")
} else {
continue
}
if !ag.OK() {
cli.Log.Debugf("Ignoring picture change notification with unexpected attributes: %v", ag.Error())
continue
}
cli.dispatchEvent(&evt)
}
}
func (cli *Client) handleDeviceNotification(node *waBinary.Node) {
cli.userDevicesCacheLock.Lock()
defer cli.userDevicesCacheLock.Unlock()
ag := node.AttrGetter()
from := ag.JID("from")
cached, ok := cli.userDevicesCache[from]
if !ok {
cli.Log.Debugf("No device list cached for %s, ignoring device list notification", from)
return
}
cachedParticipantHash := participantListHashV2(cached)
for _, child := range node.GetChildren() {
if child.Tag != "add" && child.Tag != "remove" {
cli.Log.Debugf("Unknown device list change tag %s", child.Tag)
continue
}
cag := child.AttrGetter()
deviceHash := cag.String("device_hash")
deviceChild, _ := child.GetOptionalChildByTag("device")
changedDeviceJID := deviceChild.AttrGetter().JID("jid")
switch child.Tag {
case "add":
cached = append(cached, changedDeviceJID)
case "remove":
for i, jid := range cached {
if jid == changedDeviceJID {
cached = append(cached[:i], cached[i+1:]...)
}
}
case "update":
// ???
}
newParticipantHash := participantListHashV2(cached)
if newParticipantHash == deviceHash {
cli.Log.Debugf("%s's device list hash changed from %s to %s (%s). New hash matches", from, cachedParticipantHash, deviceHash, child.Tag)
cli.userDevicesCache[from] = cached
} else {
cli.Log.Warnf("%s's device list hash changed from %s to %s (%s). New hash doesn't match (%s)", from, cachedParticipantHash, deviceHash, child.Tag, newParticipantHash)
delete(cli.userDevicesCache, from)
}
}
}
func (cli *Client) handleOwnDevicesNotification(node *waBinary.Node) {
cli.userDevicesCacheLock.Lock()
defer cli.userDevicesCacheLock.Unlock()
ownID := cli.getOwnID().ToNonAD()
if ownID.IsEmpty() {
cli.Log.Debugf("Ignoring own device change notification, session was deleted")
return
}
cached, ok := cli.userDevicesCache[ownID]
if !ok {
cli.Log.Debugf("Ignoring own device change notification, device list not cached")
return
}
oldHash := participantListHashV2(cached)
expectedNewHash := node.AttrGetter().String("dhash")
var newDeviceList []types.JID
for _, child := range node.GetChildren() {
jid := child.AttrGetter().JID("jid")
if child.Tag == "device" && !jid.IsEmpty() {
jid.AD = true
newDeviceList = append(newDeviceList, jid)
}
}
newHash := participantListHashV2(newDeviceList)
if newHash != expectedNewHash {
cli.Log.Debugf("Received own device list change notification %s -> %s, but expected hash was %s", oldHash, newHash, expectedNewHash)
delete(cli.userDevicesCache, ownID)
} else {
cli.Log.Debugf("Received own device list change notification %s -> %s", oldHash, newHash)
cli.userDevicesCache[ownID] = newDeviceList
}
}
func (cli *Client) handleAccountSyncNotification(node *waBinary.Node) {
for _, child := range node.GetChildren() {
switch child.Tag {
case "privacy":
cli.handlePrivacySettingsNotification(&child)
case "devices":
cli.handleOwnDevicesNotification(&child)
default:
cli.Log.Debugf("Unhandled account sync item %s", child.Tag)
}
}
}
func (cli *Client) handlePrivacyTokenNotification(node *waBinary.Node) {
ownID := cli.getOwnID().ToNonAD()
if ownID.IsEmpty() {
cli.Log.Debugf("Ignoring privacy token notification, session was deleted")
return
}
tokens := node.GetChildByTag("tokens")
if tokens.Tag != "tokens" {
cli.Log.Warnf("privacy_token notification didn't contain <tokens> tag")
return
}
parentAG := node.AttrGetter()
sender := parentAG.JID("from")
if !parentAG.OK() {
cli.Log.Warnf("privacy_token notification didn't have a sender (%v)", parentAG.Error())
return
}
for _, child := range tokens.GetChildren() {
ag := child.AttrGetter()
if child.Tag != "token" {
cli.Log.Warnf("privacy_token notification contained unexpected <%s> tag", child.Tag)
} else if targetUser := ag.JID("jid"); targetUser != ownID {
cli.Log.Warnf("privacy_token notification contained token for different user %s", targetUser)
} else if tokenType := ag.String("type"); tokenType != "trusted_contact" {
cli.Log.Warnf("privacy_token notification contained unexpected token type %s", tokenType)
} else if token, ok := child.Content.([]byte); !ok {
cli.Log.Warnf("privacy_token notification contained non-binary token")
} else {
timestamp := ag.UnixTime("t")
if !ag.OK() {
cli.Log.Warnf("privacy_token notification is missing some fields: %v", ag.Error())
}
err := cli.Store.PrivacyTokens.PutPrivacyTokens(store.PrivacyToken{
User: sender,
Token: token,
Timestamp: timestamp,
})
if err != nil {
cli.Log.Errorf("Failed to save privacy token from %s: %v", sender, err)
} else {
cli.Log.Debugf("Stored privacy token from %s (ts: %v)", sender, timestamp)
}
}
}
}
func (cli *Client) handleNotification(node *waBinary.Node) {
ag := node.AttrGetter()
notifType := ag.String("type")
if !ag.OK() {
return
}
go cli.sendAck(node)
switch notifType {
case "encrypt":
go cli.handleEncryptNotification(node)
case "server_sync":
go cli.handleAppStateNotification(node)
case "account_sync":
go cli.handleAccountSyncNotification(node)
case "devices":
go cli.handleDeviceNotification(node)
case "w:gp2":
evt, err := cli.parseGroupNotification(node)
if err != nil {
cli.Log.Errorf("Failed to parse group notification: %v", err)
} else {
go cli.dispatchEvent(evt)
}
case "picture":
go cli.handlePictureNotification(node)
case "mediaretry":
go cli.handleMediaRetryNotification(node)
case "privacy_token":
go cli.handlePrivacyTokenNotification(node)
// Other types: business, disappearing_mode, server, status, pay, psa
default:
cli.Log.Debugf("Unhandled notification with type %s", notifType)
}
}
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