/
matrix.go
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/
matrix.go
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// Copyright (c) 2022 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 bridge
import (
"errors"
"fmt"
"strings"
"time"
"maunium.net/go/maulogger/v2"
"maunium.net/go/mautrix"
"maunium.net/go/mautrix/appservice"
"maunium.net/go/mautrix/bridge/bridgeconfig"
"maunium.net/go/mautrix/bridge/status"
"maunium.net/go/mautrix/event"
"maunium.net/go/mautrix/format"
"maunium.net/go/mautrix/id"
)
type CommandProcessor interface {
Handle(roomID id.RoomID, eventID id.EventID, user User, message string, replyTo id.EventID)
}
type MatrixHandler struct {
bridge *Bridge
as *appservice.AppService
log maulogger.Logger
TrackEventDuration func(event.Type) func()
}
func noop() {}
func noopTrack(_ event.Type) func() {
return noop
}
func NewMatrixHandler(br *Bridge) *MatrixHandler {
handler := &MatrixHandler{
bridge: br,
as: br.AS,
log: br.Log.Sub("Matrix"),
TrackEventDuration: noopTrack,
}
for evtType := range status.CheckpointTypes {
br.EventProcessor.On(evtType, handler.sendBridgeCheckpoint)
}
br.EventProcessor.On(event.EventMessage, handler.HandleMessage)
br.EventProcessor.On(event.EventEncrypted, handler.HandleEncrypted)
br.EventProcessor.On(event.EventSticker, handler.HandleMessage)
br.EventProcessor.On(event.EventReaction, handler.HandleReaction)
br.EventProcessor.On(event.EventRedaction, handler.HandleRedaction)
br.EventProcessor.On(event.StateMember, handler.HandleMembership)
br.EventProcessor.On(event.StateRoomName, handler.HandleRoomMetadata)
br.EventProcessor.On(event.StateRoomAvatar, handler.HandleRoomMetadata)
br.EventProcessor.On(event.StateTopic, handler.HandleRoomMetadata)
br.EventProcessor.On(event.StateEncryption, handler.HandleEncryption)
br.EventProcessor.On(event.EphemeralEventReceipt, handler.HandleReceipt)
br.EventProcessor.On(event.EphemeralEventTyping, handler.HandleTyping)
return handler
}
func (mx *MatrixHandler) sendBridgeCheckpoint(evt *event.Event) {
if !evt.Mautrix.CheckpointSent {
go mx.bridge.SendMessageSuccessCheckpoint(evt, status.MsgStepBridge, 0)
}
}
func (mx *MatrixHandler) HandleEncryption(evt *event.Event) {
defer mx.TrackEventDuration(evt.Type)()
if evt.Content.AsEncryption().Algorithm != id.AlgorithmMegolmV1 {
return
}
portal := mx.bridge.Child.GetIPortal(evt.RoomID)
if portal != nil && !portal.IsEncrypted() {
mx.log.Debugfln("%s enabled encryption in %s", evt.Sender, evt.RoomID)
portal.MarkEncrypted()
if portal.IsPrivateChat() {
err := mx.as.BotIntent().EnsureJoined(evt.RoomID, appservice.EnsureJoinedParams{BotOverride: portal.MainIntent().Client})
if err != nil {
mx.log.Errorfln("Failed to join bot to %s after encryption was enabled: %v", evt.RoomID, err)
}
}
}
}
func (mx *MatrixHandler) joinAndCheckMembers(evt *event.Event, intent *appservice.IntentAPI) *mautrix.RespJoinedMembers {
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
}
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) sendNoticeWithMarkdown(roomID id.RoomID, message string) (*mautrix.RespSendEvent, error) {
intent := mx.as.BotIntent()
content := format.RenderMarkdown(message, true, false)
content.MsgType = event.MsgNotice
return intent.SendMessageEvent(roomID, event.EventMessage, content)
}
func (mx *MatrixHandler) HandleBotInvite(evt *event.Event) {
intent := mx.as.BotIntent()
user := mx.bridge.Child.GetIUser(evt.Sender, true)
if user == nil {
return
}
members := mx.joinAndCheckMembers(evt, intent)
if members == nil {
return
}
if user.GetPermissionLevel() < bridgeconfig.PermissionLevelUser {
_, _ = intent.SendNotice(evt.RoomID, "You are not whitelisted to use this bridge.\n"+
"If you're the owner of this bridge, see the bridge.permissions section in your config file.")
_, _ = intent.LeaveRoom(evt.RoomID)
return
}
texts := mx.bridge.Config.Bridge.GetManagementRoomTexts()
_, _ = mx.sendNoticeWithMarkdown(evt.RoomID, texts.Welcome)
if len(members.Joined) == 2 && (len(user.GetManagementRoomID()) == 0 || evt.Content.AsMember().IsDirect) {
user.SetManagementRoom(evt.RoomID)
_, _ = intent.SendNotice(user.GetManagementRoomID(), "This room has been registered as your bridge management/status room.")
mx.log.Debugln(evt.RoomID, "registered as a management room with", evt.Sender)
}
if evt.RoomID == user.GetManagementRoomID() {
if user.IsLoggedIn() {
_, _ = mx.sendNoticeWithMarkdown(evt.RoomID, texts.WelcomeConnected)
} else {
_, _ = mx.sendNoticeWithMarkdown(evt.RoomID, texts.WelcomeUnconnected)
}
additionalHelp := texts.AdditionalHelp
if len(additionalHelp) > 0 {
_, _ = mx.sendNoticeWithMarkdown(evt.RoomID, additionalHelp)
}
}
}
func (mx *MatrixHandler) HandleGhostInvite(evt *event.Event, inviter User, ghost Ghost) {
intent := ghost.DefaultIntent()
if inviter.GetPermissionLevel() < bridgeconfig.PermissionLevelUser {
mx.log.Debugfln("Rejecting invite for %s from %s to %s: user is not whitelisted", ghost.GetMXID(), evt.Sender, evt.RoomID)
_, err := intent.LeaveRoom(evt.RoomID, &mautrix.ReqLeave{
Reason: "You're not whitelisted to use this bridge",
})
if err != nil {
mx.log.Warnfln("Failed to reject invite for %s from %s to %s: %v", ghost.GetMXID(), evt.Sender, evt.RoomID, err)
}
return
} else if !inviter.IsLoggedIn() {
mx.log.Debugfln("Rejecting invite for %s from %s to %s: user is not logged in", ghost.GetMXID(), evt.Sender, evt.RoomID)
_, err := intent.LeaveRoom(evt.RoomID, &mautrix.ReqLeave{
Reason: "You're not logged into this bridge",
})
if err != nil {
mx.log.Warnfln("Failed to reject invite for %s from %s to %s: %v", ghost.GetMXID(), evt.Sender, evt.RoomID, err)
}
return
}
members := mx.joinAndCheckMembers(evt, intent)
if members == nil {
return
}
var createEvent event.CreateEventContent
if err := intent.StateEvent(evt.RoomID, event.StateCreate, "", &createEvent); err != nil {
mx.log.Warnfln("Failed to check m.room.create event in %s: %v", evt.RoomID, err)
} else if createEvent.Type != "" {
mx.log.Warnfln("Non-standard room type %s in %s, leaving room as %s", createEvent.Type, evt.RoomID, ghost.GetMXID())
_, err = intent.LeaveRoom(evt.RoomID, &mautrix.ReqLeave{
Reason: "Unsupported room type",
})
if err != nil {
mx.log.Warnfln("Failed to leave %s as %s: %v", evt.RoomID, ghost.GetMXID(), err)
}
return
}
var hasBridgeBot, hasOtherUsers bool
for mxid, _ := range members.Joined {
if mxid == intent.UserID || mxid == inviter.GetMXID() {
continue
} else if mxid == mx.bridge.Bot.UserID {
hasBridgeBot = true
} else {
hasOtherUsers = true
}
}
if !hasBridgeBot && !hasOtherUsers && evt.Content.AsMember().IsDirect {
mx.bridge.Child.CreatePrivatePortal(evt.RoomID, inviter, ghost)
} else if !hasBridgeBot {
mx.log.Debugln("Leaving multi-user room", evt.RoomID, "as", ghost.GetMXID(), "after accepting invite from", evt.Sender)
_, _ = intent.SendNotice(evt.RoomID, "Please invite the bridge bot first if you want to bridge to a remote chat.")
_, _ = intent.LeaveRoom(evt.RoomID)
} else {
_, _ = intent.SendNotice(evt.RoomID, "This puppet will remain inactive until this room is bridged to a remote chat.")
}
}
func (mx *MatrixHandler) HandleMembership(evt *event.Event) {
if evt.Sender == mx.bridge.Bot.UserID || mx.bridge.Child.IsGhost(evt.Sender) {
return
}
defer mx.TrackEventDuration(evt.Type)()
if mx.bridge.Crypto != nil {
mx.bridge.Crypto.HandleMemberEvent(evt)
}
content := evt.Content.AsMember()
if content.Membership == event.MembershipInvite && id.UserID(evt.GetStateKey()) == mx.as.BotMXID() {
mx.HandleBotInvite(evt)
return
}
if mx.shouldIgnoreEvent(evt) {
return
}
user := mx.bridge.Child.GetIUser(evt.Sender, true)
if user == nil {
return
}
isSelf := id.UserID(evt.GetStateKey()) == evt.Sender
ghost := mx.bridge.Child.GetIGhost(id.UserID(evt.GetStateKey()))
portal := mx.bridge.Child.GetIPortal(evt.RoomID)
if portal == nil {
if ghost != nil && content.Membership == event.MembershipInvite {
mx.HandleGhostInvite(evt, user, ghost)
}
return
} else if user.GetPermissionLevel() < bridgeconfig.PermissionLevelUser || !user.IsLoggedIn() {
return
}
mhp, ok := portal.(MembershipHandlingPortal)
if !ok {
return
}
if content.Membership == event.MembershipLeave {
if evt.Unsigned.PrevContent != nil {
_ = evt.Unsigned.PrevContent.ParseRaw(evt.Type)
prevContent, ok := evt.Unsigned.PrevContent.Parsed.(*event.MemberEventContent)
if ok && prevContent.Membership != "join" {
return
}
}
if isSelf {
mhp.HandleMatrixLeave(user)
} else if ghost != nil {
mhp.HandleMatrixKick(user, ghost)
}
} else if content.Membership == event.MembershipInvite && !isSelf && ghost != nil {
mhp.HandleMatrixInvite(user, ghost)
}
// TODO kicking/inviting non-ghost users users
}
func (mx *MatrixHandler) HandleRoomMetadata(evt *event.Event) {
defer mx.TrackEventDuration(evt.Type)()
if mx.shouldIgnoreEvent(evt) {
return
}
user := mx.bridge.Child.GetIUser(evt.Sender, true)
if user == nil {
return
}
portal := mx.bridge.Child.GetIPortal(evt.RoomID)
if portal == nil || portal.IsPrivateChat() {
return
}
metaPortal, ok := portal.(MetaHandlingPortal)
if !ok {
return
}
metaPortal.HandleMatrixMeta(user, evt)
}
func (mx *MatrixHandler) shouldIgnoreEvent(evt *event.Event) bool {
if evt.Sender == mx.bridge.Bot.UserID || mx.bridge.Child.IsGhost(evt.Sender) {
return true
}
user := mx.bridge.Child.GetIUser(evt.Sender, true)
if user == nil || user.GetPermissionLevel() <= 0 {
return true
} else if val, ok := evt.Content.Raw[appservice.DoublePuppetKey]; ok && val == mx.bridge.Name && user.GetIDoublePuppet() != nil {
return true
}
return false
}
const sessionWaitTimeout = 3 * time.Second
func (mx *MatrixHandler) sendCryptoStatusError(evt *event.Event, editEvent id.EventID, err error, retryCount int, isFinal bool) id.EventID {
mx.bridge.SendMessageErrorCheckpoint(evt, status.MsgStepDecrypted, err, isFinal, retryCount)
if mx.bridge.Config.Bridge.EnableMessageStatusEvents() {
statusEvent := &event.BeeperMessageStatusEventContent{
// TODO: network
RelatesTo: event.RelatesTo{
Type: event.RelReference,
EventID: evt.ID,
},
Status: event.MessageStatusRetriable,
Reason: event.MessageStatusUndecryptable,
Error: err.Error(),
Message: errorToHumanMessage(err),
}
if !isFinal {
statusEvent.Status = event.MessageStatusPending
}
_, sendErr := mx.bridge.Bot.SendMessageEvent(evt.RoomID, event.BeeperMessageStatus, statusEvent)
if sendErr != nil {
mx.log.Warnfln("Failed to send message status event for %s: %v", evt.ID, sendErr)
}
}
if mx.bridge.Config.Bridge.EnableMessageErrorNotices() {
update := event.MessageEventContent{
MsgType: event.MsgNotice,
Body: fmt.Sprintf("\u26a0 Your message was not bridged: %v.", err),
}
if editEvent != "" {
update.SetEdit(editEvent)
}
resp, sendErr := mx.bridge.Bot.SendMessageEvent(evt.RoomID, event.EventMessage, &update)
if sendErr != nil {
mx.log.Warnfln("Failed to send decryption error notice about %s: %v", evt.ID, sendErr)
} else if resp != nil {
return resp.EventID
}
}
return ""
}
var errDeviceNotTrusted = errors.New("your device is not trusted")
var errMessageNotEncrypted = errors.New("unencrypted message")
var errNoDecryptionKeys = errors.New("the bridge hasn't received the decryption keys")
func errorToHumanMessage(err error) string {
switch {
case errors.Is(err, errDeviceNotTrusted), errors.Is(err, errNoDecryptionKeys):
return err.Error()
case errors.Is(err, errMessageNotEncrypted):
return "the message is not encrypted"
default:
return "the bridge failed to decrypt the message"
}
}
func deviceUnverifiedErrorWithExplanation(trust id.TrustState) error {
var explanation string
switch trust {
case id.TrustStateBlacklisted:
explanation = "device is blacklisted"
case id.TrustStateUnset:
explanation = "unverified"
case id.TrustStateUnknownDevice:
explanation = "device info not found"
case id.TrustStateForwarded:
explanation = "keys were forwarded from an unknown device"
case id.TrustStateCrossSignedUntrusted:
explanation = "cross-signing keys changed after setting up the bridge"
default:
return errDeviceNotTrusted
}
return fmt.Errorf("%w (%s)", errDeviceNotTrusted, explanation)
}
func copySomeKeys(original, decrypted *event.Event) {
isScheduled, _ := original.Content.Raw["com.beeper.scheduled"].(bool)
_, alreadyExists := decrypted.Content.Raw["com.beeper.scheduled"]
if isScheduled && !alreadyExists {
decrypted.Content.Raw["com.beeper.scheduled"] = true
}
}
func (mx *MatrixHandler) postDecrypt(original, decrypted *event.Event, retryCount int, errorEventID id.EventID, duration time.Duration) {
minLevel := mx.bridge.Config.Bridge.GetEncryptionConfig().VerificationLevels.Send
if decrypted.Mautrix.TrustState < minLevel {
deviceDesc := "unknown device"
if decrypted.Mautrix.TrustSource != nil {
dev := decrypted.Mautrix.TrustSource
deviceDesc = fmt.Sprintf("%s/%s", dev.DeviceID, dev.SigningKey)
}
mx.log.Warnfln("Dropping %s from %s/%s (forwarded: %t) due to insufficient verification level (event: %s, required: %s)", decrypted.ID, decrypted.Sender, deviceDesc, decrypted.Mautrix.ForwardedKeys, decrypted.Mautrix.TrustState, minLevel)
err := deviceUnverifiedErrorWithExplanation(decrypted.Mautrix.TrustState)
go mx.sendCryptoStatusError(decrypted, errorEventID, err, retryCount, true)
return
}
copySomeKeys(original, decrypted)
mx.bridge.SendMessageSuccessCheckpoint(decrypted, status.MsgStepDecrypted, retryCount)
decrypted.Mautrix.CheckpointSent = true
decrypted.Mautrix.DecryptionDuration = duration
mx.log.Debugfln("Successfully decrypted %s", decrypted.ID)
mx.bridge.EventProcessor.Dispatch(decrypted)
if errorEventID != "" {
_, _ = mx.bridge.Bot.RedactEvent(decrypted.RoomID, errorEventID)
}
}
func (mx *MatrixHandler) HandleEncrypted(evt *event.Event) {
defer mx.TrackEventDuration(evt.Type)()
if mx.shouldIgnoreEvent(evt) || mx.bridge.Crypto == nil {
return
}
content := evt.Content.AsEncrypted()
mx.log.Debugfln("Decrypting %s (%s)", evt.ID, content.SessionID)
decryptionStart := time.Now()
decrypted, err := mx.bridge.Crypto.Decrypt(evt)
decryptionRetryCount := 0
if errors.Is(err, NoSessionFound) {
decryptionRetryCount = 1
mx.log.Debugfln("Couldn't find session %s trying to decrypt %s, waiting %d seconds...", content.SessionID, evt.ID, int(sessionWaitTimeout.Seconds()))
mx.bridge.SendMessageErrorCheckpoint(evt, status.MsgStepDecrypted, err, false, 0)
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, decryptionStart)
return
}
}
if err != nil {
mx.bridge.SendMessageErrorCheckpoint(evt, status.MsgStepDecrypted, err, true, decryptionRetryCount)
mx.log.Warnfln("Failed to decrypt %s: %v", evt.ID, err)
go mx.sendCryptoStatusError(evt, "", err, decryptionRetryCount, true)
return
}
mx.postDecrypt(evt, decrypted, decryptionRetryCount, "", time.Since(decryptionStart))
}
func (mx *MatrixHandler) waitLongerForSession(evt *event.Event, decryptionStart time.Time) {
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()))
go mx.bridge.Crypto.RequestSession(evt.RoomID, content.SenderKey, content.SessionID, evt.Sender, content.DeviceID)
errorEventID := mx.sendCryptoStatusError(evt, "", fmt.Errorf("%w. The bridge will retry for %d seconds", errNoDecryptionKeys, int(extendedTimeout.Seconds())), 1, false)
if !mx.bridge.Crypto.WaitForSession(evt.RoomID, content.SenderKey, content.SessionID, extendedTimeout) {
mx.log.Debugfln("Didn't get %s, giving up on %s", content.SessionID, evt.ID)
mx.sendCryptoStatusError(evt, errorEventID, errNoDecryptionKeys, 2, true)
return
}
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.log.Warnfln("Failed to decrypt %s: %v", evt.ID, err)
mx.sendCryptoStatusError(evt, errorEventID, err, 2, true)
return
}
mx.postDecrypt(evt, decrypted, 2, errorEventID, time.Since(decryptionStart))
}
func (mx *MatrixHandler) HandleMessage(evt *event.Event) {
defer mx.TrackEventDuration(evt.Type)()
if mx.shouldIgnoreEvent(evt) {
return
} else if !evt.Mautrix.WasEncrypted && mx.bridge.Config.Bridge.GetEncryptionConfig().Require {
mx.log.Warnfln("Dropping %s as it's not encrypted!", evt.ID)
mx.sendCryptoStatusError(evt, "", errMessageNotEncrypted, 0, true)
return
}
user := mx.bridge.Child.GetIUser(evt.Sender, true)
if user == nil {
return
}
content := evt.Content.AsMessage()
content.RemoveReplyFallback()
if user.GetPermissionLevel() >= bridgeconfig.PermissionLevelUser && content.MsgType == event.MsgText {
commandPrefix := mx.bridge.Config.Bridge.GetCommandPrefix()
hasCommandPrefix := strings.HasPrefix(content.Body, commandPrefix)
if hasCommandPrefix {
content.Body = strings.TrimLeft(content.Body[len(commandPrefix):], " ")
}
if hasCommandPrefix || evt.RoomID == user.GetManagementRoomID() {
go mx.bridge.CommandProcessor.Handle(evt.RoomID, evt.ID, user, content.Body, content.RelatesTo.GetReplyTo())
go mx.bridge.SendMessageSuccessCheckpoint(evt, status.MsgStepCommand, 0)
return
}
}
portal := mx.bridge.Child.GetIPortal(evt.RoomID)
if portal != nil {
portal.ReceiveMatrixEvent(user, evt)
}
}
func (mx *MatrixHandler) HandleReaction(evt *event.Event) {
defer mx.TrackEventDuration(evt.Type)()
if mx.shouldIgnoreEvent(evt) {
return
}
user := mx.bridge.Child.GetIUser(evt.Sender, true)
if user == nil || user.GetPermissionLevel() < bridgeconfig.PermissionLevelUser || !user.IsLoggedIn() {
return
}
portal := mx.bridge.Child.GetIPortal(evt.RoomID)
if portal != nil {
portal.ReceiveMatrixEvent(user, evt)
}
}
func (mx *MatrixHandler) HandleRedaction(evt *event.Event) {
defer mx.TrackEventDuration(evt.Type)()
if mx.shouldIgnoreEvent(evt) {
return
}
user := mx.bridge.Child.GetIUser(evt.Sender, true)
if user == nil {
return
}
portal := mx.bridge.Child.GetIPortal(evt.RoomID)
if portal != nil {
portal.ReceiveMatrixEvent(user, evt)
}
}
func (mx *MatrixHandler) HandleReceipt(evt *event.Event) {
portal := mx.bridge.Child.GetIPortal(evt.RoomID)
if portal == nil {
return
}
rrPortal, ok := portal.(ReadReceiptHandlingPortal)
if !ok {
return
}
for eventID, receipts := range *evt.Content.AsReceipt() {
for userID, receipt := range receipts[event.ReceiptTypeRead] {
user := mx.bridge.Child.GetIUser(userID, false)
if user == nil {
// Not a bridge user
continue
}
customPuppet := user.GetIDoublePuppet()
if val, ok := receipt.Extra[appservice.DoublePuppetKey].(string); ok && customPuppet != nil && val == mx.bridge.Name {
// Ignore double puppeted read receipts.
mx.log.Debugfln("Ignoring double puppeted read receipt %+v", evt.Content.Raw)
// But do start disappearing messages, because the user read the chat
dp, ok := portal.(DisappearingPortal)
if ok {
dp.ScheduleDisappearing()
}
} else {
rrPortal.HandleMatrixReadReceipt(user, eventID, receipt)
}
}
}
}
func (mx *MatrixHandler) HandleTyping(evt *event.Event) {
portal := mx.bridge.Child.GetIPortal(evt.RoomID)
if portal == nil {
return
}
typingPortal, ok := portal.(TypingPortal)
if !ok {
return
}
typingPortal.HandleMatrixTyping(evt.Content.AsTyping().UserIDs)
}