mautrix-discord/bridge/matrix.go

376 lines
11 KiB
Go

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/event"
"maunium.net/go/mautrix/format"
"maunium.net/go/mautrix/id"
)
type matrixHandler struct {
as *appservice.AppService
bridge *Bridge
log maulogger.Logger
cmd *commandHandler
}
func (b *Bridge) setupEvents() {
b.eventProcessor = appservice.NewEventProcessor(b.as)
b.matrixHandler = &matrixHandler{
as: b.as,
bridge: b,
log: b.log.Sub("Matrix"),
cmd: newCommandHandler(b),
}
b.eventProcessor.On(event.EventMessage, b.matrixHandler.handleMessage)
b.eventProcessor.On(event.EventEncrypted, b.matrixHandler.handleEncrypted)
b.eventProcessor.On(event.EventReaction, b.matrixHandler.handleReaction)
b.eventProcessor.On(event.EventRedaction, b.matrixHandler.handleRedaction)
b.eventProcessor.On(event.StateMember, b.matrixHandler.handleMembership)
b.eventProcessor.On(event.StateEncryption, b.matrixHandler.handleEncryption)
}
func (mh *matrixHandler) join(evt *event.Event, intent *appservice.IntentAPI) *mautrix.RespJoinedMembers {
resp, err := intent.JoinRoomByID(evt.RoomID)
if err != nil {
mh.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 {
intent.LeaveRoom(resp.RoomID)
mh.log.Debugfln("Failed to get members in room %s after accepting invite from %s as %s: %v", resp.RoomID, evt.Sender, intent.UserID, err)
return nil
}
if len(members.Joined) < 2 {
intent.LeaveRoom(resp.RoomID)
mh.log.Debugln("Leaving empty room", resp.RoomID, "after accepting invite from", evt.Sender, "as", intent.UserID)
return nil
}
return members
}
func (mh *matrixHandler) ignoreEvent(evt *event.Event) bool {
return false
}
func (mh *matrixHandler) handleMessage(evt *event.Event) {
if mh.ignoreEvent(evt) {
return
}
user := mh.bridge.GetUserByMXID(evt.Sender)
if user == nil {
mh.log.Debugln("unknown user", evt.Sender)
return
}
content := evt.Content.AsMessage()
content.RemoveReplyFallback()
if content.MsgType == event.MsgText {
prefix := mh.bridge.Config.Bridge.CommandPrefix
hasPrefix := strings.HasPrefix(content.Body, prefix)
if hasPrefix {
content.Body = strings.TrimLeft(content.Body[len(prefix):], " ")
}
if hasPrefix || evt.RoomID == user.ManagementRoom {
mh.cmd.handle(evt.RoomID, user, content.Body, content.GetReplyTo())
return
}
}
portal := mh.bridge.GetPortalByMXID(evt.RoomID)
if portal != nil {
portal.matrixMessages <- portalMatrixMessage{user: user, evt: evt}
}
}
func (mh *matrixHandler) joinAndCheckMembers(evt *event.Event, intent *appservice.IntentAPI) int {
resp, err := intent.JoinRoomByID(evt.RoomID)
if err != nil {
mh.log.Debugfln("Failed to join room %q as %q with invite from %q: %v", evt.RoomID, intent.UserID, evt.Sender, err)
return 0
}
members, err := intent.Members(resp.RoomID)
if err != nil {
mh.log.Debugfln("Failed to get members in room %q with invite from %q as %q: %v", resp.RoomID, evt.Sender, intent.UserID, err)
return 0
}
if len(members.Chunk) < 2 {
mh.log.Debugfln("Leaving empty room %q with invite from %q as %q", resp.RoomID, evt.Sender, intent.UserID)
intent.LeaveRoom(resp.RoomID)
return 0
}
return len(members.Chunk)
}
func (mh *matrixHandler) sendNoticeWithmarkdown(roomID id.RoomID, message string) (*mautrix.RespSendEvent, error) {
intent := mh.as.BotIntent()
content := format.RenderMarkdown(message, true, false)
content.MsgType = event.MsgNotice
return intent.SendMessageEvent(roomID, event.EventMessage, content)
}
func (mh *matrixHandler) handleBotInvite(evt *event.Event) {
intent := mh.as.BotIntent()
user := mh.bridge.GetUserByMXID(evt.Sender)
if user == nil {
return
}
members := mh.joinAndCheckMembers(evt, intent)
if members == 0 {
return
}
// If this is a DM and the user doesn't have a management room, make this
// the management room.
if members == 2 && (user.ManagementRoom == "" || evt.Content.AsMember().IsDirect) {
user.SetManagementRoom(evt.RoomID)
intent.SendNotice(user.ManagementRoom, "This room has been registered as your bridge management/status room")
mh.log.Debugfln("%q registered as management room with %q", evt.RoomID, evt.Sender)
}
if evt.RoomID == user.ManagementRoom {
// Wait to send the welcome message until we're sure we're not in an empty
// room.
mh.sendNoticeWithmarkdown(evt.RoomID, mh.bridge.Config.Bridge.ManagementRoomText.Welcome)
if user.Connected() {
mh.sendNoticeWithmarkdown(evt.RoomID, mh.bridge.Config.Bridge.ManagementRoomText.Connected)
} else {
mh.sendNoticeWithmarkdown(evt.RoomID, mh.bridge.Config.Bridge.ManagementRoomText.NotConnected)
}
additionalHelp := mh.bridge.Config.Bridge.ManagementRoomText.AdditionalHelp
if additionalHelp != "" {
mh.sendNoticeWithmarkdown(evt.RoomID, additionalHelp)
}
}
}
func (mh *matrixHandler) handlePuppetInvite(evt *event.Event, inviter *User, puppet *Puppet) {
mh.log.Warnln("handling puppet invite!")
}
func (mh *matrixHandler) handleMembership(evt *event.Event) {
// Return early if we're supposed to ignore the event.
if mh.ignoreEvent(evt) {
return
}
if mh.bridge.crypto != nil {
mh.bridge.crypto.HandleMemberEvent(evt)
}
// Grab the content of the event.
content := evt.Content.AsMember()
// Check if this is a new conversation from a matrix user to the bot
if content.Membership == event.MembershipInvite && id.UserID(evt.GetStateKey()) == mh.as.BotMXID() {
mh.handleBotInvite(evt)
return
}
// Load or create a new user.
user := mh.bridge.GetUserByMXID(evt.Sender)
if user == nil {
return
}
puppet := mh.bridge.GetPuppetByMXID(id.UserID(evt.GetStateKey()))
// Load or create a new portal.
portal := mh.bridge.GetPortalByMXID(evt.RoomID)
if portal == nil {
if content.Membership == event.MembershipInvite && puppet != nil {
mh.handlePuppetInvite(evt, user, puppet)
}
return
}
isSelf := id.UserID(evt.GetStateKey()) == evt.Sender
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 {
portal.handleMatrixLeave(user)
} else if puppet != nil {
portal.handleMatrixKick(user, puppet)
}
} else if content.Membership == event.MembershipInvite {
portal.handleMatrixInvite(user, evt)
}
}
func (mh *matrixHandler) handleReaction(evt *event.Event) {
if mh.ignoreEvent(evt) {
return
}
portal := mh.bridge.GetPortalByMXID(evt.RoomID)
if portal != nil {
portal.handleMatrixReaction(evt)
}
}
func (mh *matrixHandler) handleRedaction(evt *event.Event) {
if mh.ignoreEvent(evt) {
return
}
portal := mh.bridge.GetPortalByMXID(evt.RoomID)
if portal != nil {
portal.handleMatrixRedaction(evt)
}
}
func (mh *matrixHandler) handleEncryption(evt *event.Event) {
if evt.Content.AsEncryption().Algorithm != id.AlgorithmMegolmV1 {
return
}
portal := mh.bridge.GetPortalByMXID(evt.RoomID)
if portal != nil && !portal.Encrypted {
mh.log.Debugfln("%s enabled encryption in %s", evt.Sender, evt.RoomID)
portal.Encrypted = true
portal.Update()
}
}
const sessionWaitTimeout = 5 * time.Second
func (mh *matrixHandler) handleEncrypted(evt *event.Event) {
if mh.ignoreEvent(evt) || mh.bridge.crypto == nil {
return
}
decrypted, err := mh.bridge.crypto.Decrypt(evt)
decryptionRetryCount := 0
if errors.Is(err, NoSessionFound) {
content := evt.Content.AsEncrypted()
mh.log.Debugfln("Couldn't find session %s trying to decrypt %s, waiting %d seconds...", content.SessionID, evt.ID, int(sessionWaitTimeout.Seconds()))
mh.as.SendErrorMessageSendCheckpoint(evt, appservice.StepDecrypted, err, false, decryptionRetryCount)
decryptionRetryCount++
if mh.bridge.crypto.WaitForSession(evt.RoomID, content.SenderKey, content.SessionID, sessionWaitTimeout) {
mh.log.Debugfln("Got session %s after waiting, trying to decrypt %s again", content.SessionID, evt.ID)
decrypted, err = mh.bridge.crypto.Decrypt(evt)
} else {
mh.as.SendErrorMessageSendCheckpoint(evt, appservice.StepDecrypted, fmt.Errorf("didn't receive encryption keys"), false, decryptionRetryCount)
go mh.waitLongerForSession(evt)
return
}
}
if err != nil {
mh.as.SendErrorMessageSendCheckpoint(evt, appservice.StepDecrypted, err, true, decryptionRetryCount)
mh.log.Warnfln("Failed to decrypt %s: %v", evt.ID, err)
_, _ = mh.bridge.bot.SendNotice(evt.RoomID, fmt.Sprintf(
"\u26a0 Your message was not bridged: %v", err))
return
}
mh.as.SendMessageSendCheckpoint(decrypted, appservice.StepDecrypted, decryptionRetryCount)
mh.bridge.eventProcessor.Dispatch(decrypted)
}
func (mh *matrixHandler) waitLongerForSession(evt *event.Event) {
const extendedTimeout = sessionWaitTimeout * 3
content := evt.Content.AsEncrypted()
mh.log.Debugfln("Couldn't find session %s trying to decrypt %s, waiting %d more seconds...",
content.SessionID, evt.ID, int(extendedTimeout.Seconds()))
go mh.bridge.crypto.RequestSession(evt.RoomID, content.SenderKey, content.SessionID, evt.Sender, content.DeviceID)
resp, err := mh.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 {
mh.log.Errorfln("Failed to send decryption error to %s: %v", evt.RoomID, err)
}
update := event.MessageEventContent{MsgType: event.MsgNotice}
if mh.bridge.crypto.WaitForSession(evt.RoomID, content.SenderKey, content.SessionID, extendedTimeout) {
mh.log.Debugfln("Got session %s after waiting more, trying to decrypt %s again", content.SessionID, evt.ID)
decrypted, err := mh.bridge.crypto.Decrypt(evt)
if err == nil {
mh.as.SendMessageSendCheckpoint(decrypted, appservice.StepDecrypted, 2)
mh.bridge.eventProcessor.Dispatch(decrypted)
_, _ = mh.bridge.bot.RedactEvent(evt.RoomID, resp.EventID)
return
}
mh.log.Warnfln("Failed to decrypt %s: %v", evt.ID, err)
mh.as.SendErrorMessageSendCheckpoint(evt, appservice.StepDecrypted, err, true, 2)
update.Body = fmt.Sprintf("\u26a0 Your message was not bridged: %v", err)
} else {
mh.log.Debugfln("Didn't get %s, giving up on %s", content.SessionID, evt.ID)
mh.as.SendErrorMessageSendCheckpoint(evt, appservice.StepDecrypted, fmt.Errorf("didn't receive encryption keys"), true, 2)
update.Body = "\u26a0 Your message was not bridged: the bridge hasn't received the decryption keys. " +
"If this error keeps happening, try restarting your client."
}
newContent := update
update.NewContent = &newContent
if resp != nil {
update.RelatesTo = &event.RelatesTo{
Type: event.RelReplace,
EventID: resp.EventID,
}
}
_, err = mh.bridge.bot.SendMessageEvent(evt.RoomID, event.EventMessage, &update)
if err != nil {
mh.log.Debugfln("Failed to update decryption error notice %s: %v", resp.EventID, err)
}
}