mautrix-whatsapp/matrix.go

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// mautrix-whatsapp - A Matrix-WhatsApp puppeting bridge.
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// Copyright (C) 2020 Tulir Asokan
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
package main
import (
"errors"
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"fmt"
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"strings"
"time"
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"maunium.net/go/maulogger/v2"
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"maunium.net/go/mautrix"
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"maunium.net/go/mautrix/appservice"
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"maunium.net/go/mautrix/event"
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"maunium.net/go/mautrix/format"
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"maunium.net/go/mautrix/id"
"maunium.net/go/mautrix-whatsapp/database"
)
type MatrixHandler struct {
bridge *Bridge
as *appservice.AppService
log maulogger.Logger
cmd *CommandHandler
}
func NewMatrixHandler(bridge *Bridge) *MatrixHandler {
handler := &MatrixHandler{
bridge: bridge,
as: bridge.AS,
log: bridge.Log.Sub("Matrix"),
cmd: NewCommandHandler(bridge),
}
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bridge.EventProcessor.On(event.EventMessage, handler.HandleMessage)
bridge.EventProcessor.On(event.EventEncrypted, handler.HandleEncrypted)
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bridge.EventProcessor.On(event.EventSticker, handler.HandleMessage)
bridge.EventProcessor.On(event.EventRedaction, handler.HandleRedaction)
bridge.EventProcessor.On(event.StateMember, handler.HandleMembership)
bridge.EventProcessor.On(event.StateRoomName, handler.HandleRoomMetadata)
bridge.EventProcessor.On(event.StateRoomAvatar, handler.HandleRoomMetadata)
bridge.EventProcessor.On(event.StateTopic, handler.HandleRoomMetadata)
bridge.EventProcessor.On(event.StateEncryption, handler.HandleEncryption)
return handler
}
func (mx *MatrixHandler) HandleEncryption(evt *event.Event) {
defer mx.bridge.Metrics.TrackEvent(evt.Type)()
if evt.Content.AsEncryption().Algorithm != id.AlgorithmMegolmV1 {
return
}
portal := mx.bridge.GetPortalByMXID(evt.RoomID)
if portal != nil && !portal.Encrypted {
mx.log.Debugfln("%s enabled encryption in %s", evt.Sender, evt.RoomID)
portal.Encrypted = true
portal.Update()
}
}
func (mx *MatrixHandler) joinAndCheckMembers(evt *event.Event, intent *appservice.IntentAPI) *mautrix.RespJoinedMembers {
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resp, err := intent.JoinRoomByID(evt.RoomID)
if err != nil {
mx.log.Debugfln("Failed to join room %s as %s with invite from %s: %v", evt.RoomID, intent.UserID, evt.Sender, err)
return nil
}
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members, err := intent.JoinedMembers(resp.RoomID)
if err != nil {
mx.log.Debugfln("Failed to get members in room %s after accepting invite from %s as %s: %v", resp.RoomID, evt.Sender, intent.UserID, err)
_, _ = intent.LeaveRoom(resp.RoomID)
return nil
}
if len(members.Joined) < 2 {
mx.log.Debugln("Leaving empty room", resp.RoomID, "after accepting invite from", evt.Sender, "as", intent.UserID)
_, _ = intent.LeaveRoom(resp.RoomID)
return nil
}
return members
}
func (mx *MatrixHandler) HandleBotInvite(evt *event.Event) {
intent := mx.as.BotIntent()
user := mx.bridge.GetUserByMXID(evt.Sender)
if user == nil {
return
}
members := mx.joinAndCheckMembers(evt, intent)
if members == nil {
return
}
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if !user.Whitelisted {
_, _ = intent.SendNotice(evt.RoomID, "You are not whitelisted to use this bridge.\n"+
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"If you're the owner of this bridge, see the bridge.permissions section in your config file.")
_, _ = intent.LeaveRoom(evt.RoomID)
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return
}
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if evt.RoomID == mx.bridge.Config.Bridge.Relaybot.ManagementRoom {
_, _ = intent.SendNotice(evt.RoomID, "This is the relaybot management room. Send `!wa help` to get a list of commands.")
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mx.log.Debugln("Joined relaybot management room", evt.RoomID, "after invite from", evt.Sender)
return
}
hasPuppets := false
for mxid, _ := range members.Joined {
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if mxid == intent.UserID || mxid == evt.Sender {
continue
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} else if _, ok := mx.bridge.ParsePuppetMXID(mxid); ok {
hasPuppets = true
continue
}
mx.log.Debugln("Leaving multi-user room", evt.RoomID, "after accepting invite from", evt.Sender)
_, _ = intent.SendNotice(evt.RoomID, "This bridge is user-specific, please don't invite me into rooms with other users.")
_, _ = intent.LeaveRoom(evt.RoomID)
return
}
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if !hasPuppets && (len(user.ManagementRoom) == 0 || evt.Content.AsMember().IsDirect) {
user.SetManagementRoom(evt.RoomID)
_, _ = intent.SendNotice(user.ManagementRoom, "This room has been registered as your bridge management/status room. Send `help` to get a list of commands.")
mx.log.Debugln(evt.RoomID, "registered as a management room with", evt.Sender)
}
}
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func (mx *MatrixHandler) handlePrivatePortal(roomID id.RoomID, inviter *User, puppet *Puppet, key database.PortalKey) {
portal := mx.bridge.GetPortalByJID(key)
if len(portal.MXID) == 0 {
mx.createPrivatePortalFromInvite(roomID, inviter, puppet, portal)
return
}
err := portal.MainIntent().EnsureInvited(portal.MXID, inviter.MXID)
if err != nil {
mx.log.Warnfln("Failed to invite %s to existing private chat portal %s with %s: %v. Redirecting portal to new room...", inviter.MXID, portal.MXID, puppet.JID, err)
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mx.createPrivatePortalFromInvite(roomID, inviter, puppet, portal)
return
}
intent := puppet.DefaultIntent()
_, _ = intent.SendNotice(roomID, "You already have a private chat portal with me at %s")
mx.log.Debugln("Leaving private chat room", roomID, "as", puppet.MXID, "after accepting invite from", inviter.MXID, "as we already have chat with the user")
_, _ = intent.LeaveRoom(roomID)
}
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func (mx *MatrixHandler) createPrivatePortalFromInvite(roomID id.RoomID, inviter *User, puppet *Puppet, portal *Portal) {
portal.MXID = roomID
portal.Topic = "WhatsApp private chat"
_, _ = portal.MainIntent().SetRoomTopic(portal.MXID, portal.Topic)
if portal.bridge.Config.Bridge.PrivateChatPortalMeta {
portal.Name = puppet.Displayname
portal.AvatarURL = puppet.AvatarURL
portal.Avatar = puppet.Avatar
_, _ = portal.MainIntent().SetRoomName(portal.MXID, portal.Name)
_, _ = portal.MainIntent().SetRoomAvatar(portal.MXID, portal.AvatarURL)
} else {
portal.Name = ""
}
portal.log.Infoln("Created private chat portal in %s after invite from", roomID, inviter.MXID)
intent := puppet.DefaultIntent()
if mx.bridge.Config.Bridge.Encryption.Default {
_, err := intent.InviteUser(roomID, &mautrix.ReqInviteUser{UserID: mx.bridge.Bot.UserID})
if err != nil {
portal.log.Warnln("Failed to invite bridge bot to enable e2be:", err)
}
err = mx.bridge.Bot.EnsureJoined(roomID)
if err != nil {
portal.log.Warnln("Failed to join as bridge bot to enable e2be:", err)
}
_, err = intent.SendStateEvent(roomID, event.StateEncryption, "", &event.EncryptionEventContent{Algorithm: id.AlgorithmMegolmV1})
if err != nil {
portal.log.Warnln("Failed to enable e2be:", err)
}
mx.as.StateStore.SetMembership(roomID, inviter.MXID, event.MembershipJoin)
mx.as.StateStore.SetMembership(roomID, puppet.MXID, event.MembershipJoin)
mx.as.StateStore.SetMembership(roomID, mx.bridge.Bot.UserID, event.MembershipJoin)
portal.Encrypted = true
}
portal.Update()
portal.UpdateBridgeInfo()
_, _ = intent.SendNotice(roomID, "Private chat portal created")
err := portal.FillInitialHistory(inviter)
if err != nil {
portal.log.Errorln("Failed to fill history:", err)
}
inviter.addPortalToCommunity(portal)
inviter.addPuppetToCommunity(puppet)
}
func (mx *MatrixHandler) HandlePuppetInvite(evt *event.Event, inviter *User, puppet *Puppet) {
intent := puppet.DefaultIntent()
members := mx.joinAndCheckMembers(evt, intent)
if members == nil {
return
}
var hasBridgeBot, hasOtherUsers bool
for mxid, _ := range members.Joined {
if mxid == intent.UserID || mxid == inviter.MXID {
continue
} else if mxid == mx.bridge.Bot.UserID {
hasBridgeBot = true
} else {
hasOtherUsers = true
}
}
if !hasBridgeBot && !hasOtherUsers {
key := database.NewPortalKey(puppet.JID, inviter.JID)
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mx.handlePrivatePortal(evt.RoomID, inviter, puppet, key)
} else if !hasBridgeBot {
mx.log.Debugln("Leaving multi-user room", evt.RoomID, "as", puppet.MXID, "after accepting invite from", evt.Sender)
_, _ = intent.SendNotice(evt.RoomID, "Please invite the bridge bot first if you want to bridge to a WhatsApp group.")
_, _ = intent.LeaveRoom(evt.RoomID)
} else {
_, _ = intent.SendNotice(evt.RoomID, "This puppet will remain inactive until this room is bridged to a WhatsApp group.")
}
}
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func (mx *MatrixHandler) HandleMembership(evt *event.Event) {
if _, isPuppet := mx.bridge.ParsePuppetMXID(evt.Sender); evt.Sender == mx.bridge.Bot.UserID || isPuppet {
return
}
defer mx.bridge.Metrics.TrackEvent(evt.Type)()
if mx.bridge.Crypto != nil {
mx.bridge.Crypto.HandleMemberEvent(evt)
}
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content := evt.Content.AsMember()
if content.Membership == event.MembershipInvite && id.UserID(evt.GetStateKey()) == mx.as.BotMXID() {
mx.HandleBotInvite(evt)
return
}
user := mx.bridge.GetUserByMXID(evt.Sender)
if user == nil || !user.Whitelisted || !user.IsConnected() {
return
}
portal := mx.bridge.GetPortalByMXID(evt.RoomID)
if portal == nil {
puppet := mx.bridge.GetPuppetByMXID(id.UserID(evt.GetStateKey()))
if content.Membership == event.MembershipInvite && puppet != nil {
mx.HandlePuppetInvite(evt, user, puppet)
}
return
}
isSelf := id.UserID(evt.GetStateKey()) == evt.Sender
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if content.Membership == event.MembershipLeave {
if isSelf {
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if evt.Unsigned.PrevContent != nil {
_ = evt.Unsigned.PrevContent.ParseRaw(evt.Type)
prevContent, ok := evt.Unsigned.PrevContent.Parsed.(*event.MemberEventContent)
if ok {
if portal.IsPrivateChat() || prevContent.Membership == "join" {
portal.HandleMatrixLeave(user)
}
}
}
} else {
portal.HandleMatrixKick(user, evt)
}
} else if content.Membership == event.MembershipInvite && !isSelf {
portal.HandleMatrixInvite(user, evt)
}
}
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func (mx *MatrixHandler) HandleRoomMetadata(evt *event.Event) {
defer mx.bridge.Metrics.TrackEvent(evt.Type)()
user := mx.bridge.GetUserByMXID(evt.Sender)
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if user == nil || !user.Whitelisted || !user.IsConnected() {
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return
}
portal := mx.bridge.GetPortalByMXID(evt.RoomID)
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if portal == nil || portal.IsPrivateChat() {
return
}
var resp <-chan string
var err error
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switch content := evt.Content.Parsed.(type) {
case *event.RoomNameEventContent:
resp, err = user.Conn.UpdateGroupSubject(content.Name, portal.Key.JID)
case *event.TopicEventContent:
resp, err = user.Conn.UpdateGroupDescription(portal.Key.JID, content.Topic)
case *event.RoomAvatarEventContent:
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return
}
if err != nil {
mx.log.Errorln(err)
} else {
out := <-resp
mx.log.Infoln(out)
}
}
func (mx *MatrixHandler) shouldIgnoreEvent(evt *event.Event) bool {
if _, isPuppet := mx.bridge.ParsePuppetMXID(evt.Sender); evt.Sender == mx.bridge.Bot.UserID || isPuppet {
return true
}
isCustomPuppet, ok := evt.Content.Raw["net.maunium.whatsapp.puppet"].(bool)
if ok && isCustomPuppet && mx.bridge.GetPuppetByCustomMXID(evt.Sender) != nil {
return true
}
user := mx.bridge.GetUserByMXID(evt.Sender)
if !user.RelaybotWhitelisted {
return true
}
return false
}
const sessionWaitTimeout = 5 * time.Second
func (mx *MatrixHandler) HandleEncrypted(evt *event.Event) {
defer mx.bridge.Metrics.TrackEvent(evt.Type)()
if mx.shouldIgnoreEvent(evt) || mx.bridge.Crypto == nil {
return
}
decrypted, err := mx.bridge.Crypto.Decrypt(evt)
if errors.Is(err, NoSessionFound) {
content := evt.Content.AsEncrypted()
mx.log.Debugfln("Couldn't find session %s trying to decrypt %s, waiting %d seconds...", content.SessionID, evt.ID, int(sessionWaitTimeout.Seconds()))
if mx.bridge.Crypto.WaitForSession(evt.RoomID, content.SenderKey, content.SessionID, sessionWaitTimeout) {
mx.log.Debugfln("Got session %s after waiting, trying to decrypt %s again", content.SessionID, evt.ID)
decrypted, err = mx.bridge.Crypto.Decrypt(evt)
} else {
go mx.waitLongerForSession(evt)
return
}
}
if err != nil {
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mx.log.Warnfln("Failed to decrypt %s: %v", evt.ID, err)
_, _ = mx.bridge.Bot.SendNotice(evt.RoomID, fmt.Sprintf(
"\u26a0 Your message was not bridged: %v", err))
return
}
mx.bridge.EventProcessor.Dispatch(decrypted)
}
func (mx *MatrixHandler) waitLongerForSession(evt *event.Event) {
const extendedTimeout = sessionWaitTimeout * 2
content := evt.Content.AsEncrypted()
mx.log.Debugfln("Couldn't find session %s trying to decrypt %s, waiting %d more seconds...",
content.SessionID, evt.ID, int(extendedTimeout.Seconds()))
resp, err := mx.bridge.Bot.SendNotice(evt.RoomID, fmt.Sprintf(
"\u26a0 Your message was not bridged: the bridge hasn't received the decryption keys. "+
"The bridge will retry for %d seconds. If this error keeps happening, try restarting your client.",
int(extendedTimeout.Seconds())))
if err != nil {
mx.log.Errorfln("Failed to send decryption error to %s: %v", evt.RoomID, err)
}
update := event.MessageEventContent{MsgType: event.MsgNotice}
if mx.bridge.Crypto.WaitForSession(evt.RoomID, content.SenderKey, content.SessionID, extendedTimeout) {
mx.log.Debugfln("Got session %s after waiting more, trying to decrypt %s again", content.SessionID, evt.ID)
decrypted, err := mx.bridge.Crypto.Decrypt(evt)
if err == nil {
mx.bridge.EventProcessor.Dispatch(decrypted)
_, _ = mx.bridge.Bot.RedactEvent(evt.RoomID, resp.EventID)
return
}
mx.log.Warnfln("Failed to decrypt %s: %v", err)
update.Body = fmt.Sprintf("\u26a0 Your message was not bridged: %v", err)
} else {
mx.log.Debugfln("Didn't get %s, giving up on %s", content.SessionID, evt.ID)
update.Body = "\u26a0 Your message was not bridged: the bridge hasn't received the decryption keys. " +
"If this keeps happening, try restarting your client."
}
newContent := update
update.NewContent = &newContent
if resp != nil {
update.RelatesTo = &event.RelatesTo{
Type: event.RelReplace,
EventID: resp.EventID,
}
}
_, _ = mx.bridge.Bot.SendMessageEvent(evt.RoomID, event.EventMessage, &update)
}
func (mx *MatrixHandler) HandleMessage(evt *event.Event) {
defer mx.bridge.Metrics.TrackEvent(evt.Type)()
if mx.shouldIgnoreEvent(evt) {
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return
}
user := mx.bridge.GetUserByMXID(evt.Sender)
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content := evt.Content.AsMessage()
if user.Whitelisted && content.MsgType == event.MsgText {
commandPrefix := mx.bridge.Config.Bridge.CommandPrefix
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hasCommandPrefix := strings.HasPrefix(content.Body, commandPrefix)
if hasCommandPrefix {
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content.Body = strings.TrimLeft(content.Body[len(commandPrefix):], " ")
}
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if hasCommandPrefix || evt.RoomID == user.ManagementRoom {
mx.cmd.Handle(evt.RoomID, user, content.Body)
return
}
}
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portal := mx.bridge.GetPortalByMXID(evt.RoomID)
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if portal != nil && (user.Whitelisted || portal.HasRelaybot()) {
portal.HandleMatrixMessage(user, evt)
}
}
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func (mx *MatrixHandler) HandleRedaction(evt *event.Event) {
defer mx.bridge.Metrics.TrackEvent(evt.Type)()
if _, isPuppet := mx.bridge.ParsePuppetMXID(evt.Sender); evt.Sender == mx.bridge.Bot.UserID || isPuppet {
return
}
user := mx.bridge.GetUserByMXID(evt.Sender)
if !user.Whitelisted {
return
}
if !user.HasSession() {
return
} else if !user.IsConnected() {
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msg := format.RenderMarkdown(fmt.Sprintf("[%[1]s](https://matrix.to/#/%[1]s): \u26a0 "+
"You are not connected to WhatsApp, so your redaction was not bridged. "+
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"Use `%[2]s reconnect` to reconnect.", user.MXID, mx.bridge.Config.Bridge.CommandPrefix), true, false)
msg.MsgType = event.MsgNotice
_, _ = mx.bridge.Bot.SendMessageEvent(evt.RoomID, event.EventMessage, msg)
return
}
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portal := mx.bridge.GetPortalByMXID(evt.RoomID)
if portal != nil {
portal.HandleMatrixRedaction(user, evt)
}
}