Double puppet support
This commit is contained in:
Gary Kramlich
337
bridge/custompuppet.go
Normal file
337
bridge/custompuppet.go
Normal file
@@ -0,0 +1,337 @@
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package bridge
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import (
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"crypto/hmac"
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"crypto/sha512"
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"encoding/hex"
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"errors"
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"fmt"
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"time"
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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/id"
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)
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var (
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ErrNoCustomMXID = errors.New("no custom mxid set")
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ErrMismatchingMXID = errors.New("whoami result does not match custom mxid")
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)
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///////////////////////////////////////////////////////////////////////////////
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// additional bridge api
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///////////////////////////////////////////////////////////////////////////////
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func (b *Bridge) newDoublePuppetClient(mxid id.UserID, accessToken string) (*mautrix.Client, error) {
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_, homeserver, err := mxid.Parse()
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if err != nil {
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return nil, err
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}
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homeserverURL, found := b.Config.Bridge.DoublePuppetServerMap[homeserver]
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if !found {
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if homeserver == b.as.HomeserverDomain {
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homeserverURL = b.as.HomeserverURL
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} else if b.Config.Bridge.DoublePuppetAllowDiscovery {
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resp, err := mautrix.DiscoverClientAPI(homeserver)
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if err != nil {
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return nil, fmt.Errorf("failed to find homeserver URL for %s: %v", homeserver, err)
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}
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homeserverURL = resp.Homeserver.BaseURL
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b.log.Debugfln("Discovered URL %s for %s to enable double puppeting for %s", homeserverURL, homeserver, mxid)
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} else {
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return nil, fmt.Errorf("double puppeting from %s is not allowed", homeserver)
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}
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}
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client, err := mautrix.NewClient(homeserverURL, mxid, accessToken)
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if err != nil {
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return nil, err
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}
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client.Logger = b.as.Log.Sub(mxid.String())
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client.Client = b.as.HTTPClient
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client.DefaultHTTPRetries = b.as.DefaultHTTPRetries
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return client, nil
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}
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///////////////////////////////////////////////////////////////////////////////
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// mautrix.Syncer implementation
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///////////////////////////////////////////////////////////////////////////////
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func (p *Puppet) GetFilterJSON(_ id.UserID) *mautrix.Filter {
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everything := []event.Type{{Type: "*"}}
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return &mautrix.Filter{
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Presence: mautrix.FilterPart{
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Senders: []id.UserID{p.CustomMXID},
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Types: []event.Type{event.EphemeralEventPresence},
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},
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AccountData: mautrix.FilterPart{NotTypes: everything},
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Room: mautrix.RoomFilter{
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Ephemeral: mautrix.FilterPart{Types: []event.Type{event.EphemeralEventTyping, event.EphemeralEventReceipt}},
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IncludeLeave: false,
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AccountData: mautrix.FilterPart{NotTypes: everything},
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State: mautrix.FilterPart{NotTypes: everything},
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Timeline: mautrix.FilterPart{NotTypes: everything},
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},
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}
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}
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func (p *Puppet) OnFailedSync(_ *mautrix.RespSync, err error) (time.Duration, error) {
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p.log.Warnln("Sync error:", err)
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if errors.Is(err, mautrix.MUnknownToken) {
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if !p.tryRelogin(err, "syncing") {
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return 0, err
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}
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p.customIntent.AccessToken = p.AccessToken
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return 0, nil
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}
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return 10 * time.Second, nil
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}
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func (p *Puppet) ProcessResponse(resp *mautrix.RespSync, _ string) error {
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if !p.customUser.LoggedIn() {
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p.log.Debugln("Skipping sync processing: custom user not connected to discord")
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return nil
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}
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// for roomID, events := range resp.Rooms.Join {
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// for _, evt := range events.Ephemeral.Events {
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// evt.RoomID = roomID
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// err := evt.Content.ParseRaw(evt.Type)
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// if err != nil {
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// continue
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// }
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// switch evt.Type {
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// case event.EphemeralEventReceipt:
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// if p.EnableReceipts {
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// go p.bridge.matrixHandler.HandleReceipt(evt)
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// }
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// case event.EphemeralEventTyping:
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// go p.bridge.matrixHandler.HandleTyping(evt)
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// }
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// }
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// }
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// if p.EnablePresence {
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// for _, evt := range resp.Presence.Events {
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// if evt.Sender != p.CustomMXID {
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// continue
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// }
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// err := evt.Content.ParseRaw(evt.Type)
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// if err != nil {
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// continue
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// }
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// go p.bridge.matrixHandler.HandlePresence(evt)
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// }
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// }
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return nil
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}
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///////////////////////////////////////////////////////////////////////////////
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// mautrix.Storer implementation
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///////////////////////////////////////////////////////////////////////////////
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func (p *Puppet) SaveFilterID(_ id.UserID, _ string) {
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}
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func (p *Puppet) SaveNextBatch(_ id.UserID, nbt string) {
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p.NextBatch = nbt
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p.Update()
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}
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func (p *Puppet) SaveRoom(_ *mautrix.Room) {
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}
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func (p *Puppet) LoadFilterID(_ id.UserID) string {
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return ""
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}
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func (p *Puppet) LoadNextBatch(_ id.UserID) string {
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return p.NextBatch
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}
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func (p *Puppet) LoadRoom(_ id.RoomID) *mautrix.Room {
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return nil
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}
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///////////////////////////////////////////////////////////////////////////////
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// additional puppet api
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///////////////////////////////////////////////////////////////////////////////
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func (p *Puppet) clearCustomMXID() {
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p.CustomMXID = ""
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p.AccessToken = ""
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p.customIntent = nil
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p.customUser = nil
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}
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func (p *Puppet) newCustomIntent() (*appservice.IntentAPI, error) {
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if p.CustomMXID == "" {
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return nil, ErrNoCustomMXID
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}
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client, err := p.bridge.newDoublePuppetClient(p.CustomMXID, p.AccessToken)
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if err != nil {
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return nil, err
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}
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client.Syncer = p
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client.Store = p
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ia := p.bridge.as.NewIntentAPI("custom")
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ia.Client = client
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ia.Localpart, _, _ = p.CustomMXID.Parse()
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ia.UserID = p.CustomMXID
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ia.IsCustomPuppet = true
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return ia, nil
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}
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func (p *Puppet) StartCustomMXID(reloginOnFail bool) error {
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if p.CustomMXID == "" {
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p.clearCustomMXID()
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return nil
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}
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intent, err := p.newCustomIntent()
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if err != nil {
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p.clearCustomMXID()
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return err
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}
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resp, err := intent.Whoami()
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if err != nil {
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if !reloginOnFail || (errors.Is(err, mautrix.MUnknownToken) && !p.tryRelogin(err, "initializing double puppeting")) {
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p.clearCustomMXID()
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return err
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}
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intent.AccessToken = p.AccessToken
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} else if resp.UserID != p.CustomMXID {
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p.clearCustomMXID()
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return ErrMismatchingMXID
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}
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p.customIntent = intent
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p.customUser = p.bridge.GetUserByMXID(p.CustomMXID)
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p.startSyncing()
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return nil
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}
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func (p *Puppet) tryRelogin(cause error, action string) bool {
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if !p.bridge.Config.CanAutoDoublePuppet(p.CustomMXID) {
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return false
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}
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p.log.Debugfln("Trying to relogin after '%v' while %s", cause, action)
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accessToken, err := p.loginWithSharedSecret(p.CustomMXID)
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if err != nil {
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p.log.Errorfln("Failed to relogin after '%v' while %s: %v", cause, action, err)
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return false
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}
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p.log.Infofln("Successfully relogined after '%v' while %s", cause, action)
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p.AccessToken = accessToken
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return true
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}
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func (p *Puppet) startSyncing() {
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if !p.bridge.Config.Bridge.SyncWithCustomPuppets {
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return
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}
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go func() {
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p.log.Debugln("Starting syncing...")
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p.customIntent.SyncPresence = "offline"
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err := p.customIntent.Sync()
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if err != nil {
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p.log.Errorln("Fatal error syncing:", err)
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}
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}()
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}
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func (p *Puppet) stopSyncing() {
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if !p.bridge.Config.Bridge.SyncWithCustomPuppets {
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return
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}
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p.customIntent.StopSync()
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}
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func (p *Puppet) loginWithSharedSecret(mxid id.UserID) (string, error) {
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_, homeserver, _ := mxid.Parse()
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p.log.Debugfln("Logging into %s with shared secret", mxid)
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mac := hmac.New(sha512.New, []byte(p.bridge.Config.Bridge.LoginSharedSecretMap[homeserver]))
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mac.Write([]byte(mxid))
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client, err := p.bridge.newDoublePuppetClient(mxid, "")
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if err != nil {
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return "", fmt.Errorf("failed to create mautrix client to log in: %v", err)
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}
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resp, err := client.Login(&mautrix.ReqLogin{
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Type: mautrix.AuthTypePassword,
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Identifier: mautrix.UserIdentifier{Type: mautrix.IdentifierTypeUser, User: string(mxid)},
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Password: hex.EncodeToString(mac.Sum(nil)),
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DeviceID: "Discord Bridge",
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InitialDeviceDisplayName: "Discord Bridge",
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})
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if err != nil {
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return "", err
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}
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return resp.AccessToken, nil
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}
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func (p *Puppet) SwitchCustomMXID(accessToken string, mxid id.UserID) error {
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prevCustomMXID := p.CustomMXID
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if p.customIntent != nil {
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p.stopSyncing()
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}
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p.CustomMXID = mxid
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p.AccessToken = accessToken
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err := p.StartCustomMXID(false)
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if err != nil {
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return err
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}
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if prevCustomMXID != "" {
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delete(p.bridge.puppetsByCustomMXID, prevCustomMXID)
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}
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if p.CustomMXID != "" {
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p.bridge.puppetsByCustomMXID[p.CustomMXID] = p
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}
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p.EnablePresence = p.bridge.Config.Bridge.DefaultBridgePresence
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p.EnableReceipts = p.bridge.Config.Bridge.DefaultBridgeReceipts
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p.bridge.as.StateStore.MarkRegistered(p.CustomMXID)
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p.Update()
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// TODO leave rooms with default puppet
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return nil
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}
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