mautrix-whatsapp/custompuppet.go

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// mautrix-whatsapp - A Matrix-WhatsApp puppeting bridge.
// Copyright (C) 2021 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 (
"crypto/hmac"
"crypto/sha512"
"encoding/hex"
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"errors"
"fmt"
"time"
"maunium.net/go/mautrix"
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"maunium.net/go/mautrix/appservice"
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"maunium.net/go/mautrix/event"
"maunium.net/go/mautrix/id"
)
var (
ErrNoCustomMXID = errors.New("no custom mxid set")
ErrMismatchingMXID = errors.New("whoami result does not match custom mxid")
)
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func (puppet *Puppet) SwitchCustomMXID(accessToken string, mxid id.UserID) error {
prevCustomMXID := puppet.CustomMXID
if puppet.customIntent != nil {
puppet.stopSyncing()
}
puppet.CustomMXID = mxid
puppet.AccessToken = accessToken
err := puppet.StartCustomMXID(false)
if err != nil {
return err
}
if len(prevCustomMXID) > 0 {
delete(puppet.bridge.puppetsByCustomMXID, prevCustomMXID)
}
if len(puppet.CustomMXID) > 0 {
puppet.bridge.puppetsByCustomMXID[puppet.CustomMXID] = puppet
}
puppet.EnablePresence = puppet.bridge.Config.Bridge.DefaultBridgePresence
puppet.EnableReceipts = puppet.bridge.Config.Bridge.DefaultBridgeReceipts
puppet.bridge.AS.StateStore.MarkRegistered(puppet.CustomMXID)
puppet.Update()
// TODO leave rooms with default puppet
return nil
}
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func (puppet *Puppet) loginWithSharedSecret(mxid id.UserID) (string, error) {
_, homeserver, _ := mxid.Parse()
puppet.log.Debugfln("Logging into %s with shared secret", mxid)
mac := hmac.New(sha512.New, []byte(puppet.bridge.Config.Bridge.LoginSharedSecretMap[homeserver]))
mac.Write([]byte(mxid))
client, err := puppet.bridge.newDoublePuppetClient(mxid, "")
if err != nil {
return "", fmt.Errorf("failed to create mautrix client to log in: %v", err)
}
resp, err := client.Login(&mautrix.ReqLogin{
Type: mautrix.AuthTypePassword,
Identifier: mautrix.UserIdentifier{Type: mautrix.IdentifierTypeUser, User: string(mxid)},
Password: hex.EncodeToString(mac.Sum(nil)),
DeviceID: "WhatsApp bridge",
InitialDeviceDisplayName: "WhatsApp bridge",
})
if err != nil {
return "", err
}
return resp.AccessToken, nil
}
func (br *WABridge) newDoublePuppetClient(mxid id.UserID, accessToken string) (*mautrix.Client, error) {
_, homeserver, err := mxid.Parse()
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if err != nil {
return nil, err
}
homeserverURL, found := br.Config.Bridge.DoublePuppetServerMap[homeserver]
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if !found {
if homeserver == br.AS.HomeserverDomain {
homeserverURL = br.AS.HomeserverURL
} else if br.Config.Bridge.DoublePuppetAllowDiscovery {
resp, err := mautrix.DiscoverClientAPI(homeserver)
if err != nil {
return nil, fmt.Errorf("failed to find homeserver URL for %s: %v", homeserver, err)
}
homeserverURL = resp.Homeserver.BaseURL
br.Log.Debugfln("Discovered URL %s for %s to enable double puppeting for %s", homeserverURL, homeserver, mxid)
} else {
return nil, fmt.Errorf("double puppeting from %s is not allowed", homeserver)
}
}
client, err := mautrix.NewClient(homeserverURL, mxid, accessToken)
if err != nil {
return nil, err
}
client.Logger = br.AS.Log.Sub(mxid.String())
client.Client = br.AS.HTTPClient
client.DefaultHTTPRetries = br.AS.DefaultHTTPRetries
return client, nil
}
func (puppet *Puppet) newCustomIntent() (*appservice.IntentAPI, error) {
if len(puppet.CustomMXID) == 0 {
return nil, ErrNoCustomMXID
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}
client, err := puppet.bridge.newDoublePuppetClient(puppet.CustomMXID, puppet.AccessToken)
if err != nil {
return nil, err
}
client.Syncer = puppet
client.Store = puppet
ia := puppet.bridge.AS.NewIntentAPI("custom")
ia.Client = client
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ia.Localpart, _, _ = puppet.CustomMXID.Parse()
ia.UserID = puppet.CustomMXID
ia.IsCustomPuppet = true
return ia, nil
}
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func (puppet *Puppet) clearCustomMXID() {
puppet.CustomMXID = ""
puppet.AccessToken = ""
puppet.customIntent = nil
puppet.customUser = nil
}
func (puppet *Puppet) StartCustomMXID(reloginOnFail bool) error {
if len(puppet.CustomMXID) == 0 {
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puppet.clearCustomMXID()
return nil
}
intent, err := puppet.newCustomIntent()
if err != nil {
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puppet.clearCustomMXID()
return err
}
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resp, err := intent.Whoami()
if err != nil {
if !reloginOnFail || (errors.Is(err, mautrix.MUnknownToken) && !puppet.tryRelogin(err, "initializing double puppeting")) {
puppet.clearCustomMXID()
return err
}
intent.AccessToken = puppet.AccessToken
} else if resp.UserID != puppet.CustomMXID {
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puppet.clearCustomMXID()
return ErrMismatchingMXID
}
puppet.customIntent = intent
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puppet.customUser = puppet.bridge.GetUserByMXID(puppet.CustomMXID)
puppet.startSyncing()
return nil
}
func (puppet *Puppet) startSyncing() {
if !puppet.bridge.Config.Bridge.SyncWithCustomPuppets {
return
}
go func() {
puppet.log.Debugln("Starting syncing...")
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puppet.customIntent.SyncPresence = "offline"
err := puppet.customIntent.Sync()
if err != nil {
puppet.log.Errorln("Fatal error syncing:", err)
}
}()
}
func (puppet *Puppet) stopSyncing() {
if !puppet.bridge.Config.Bridge.SyncWithCustomPuppets {
return
}
puppet.customIntent.StopSync()
}
func (puppet *Puppet) ProcessResponse(resp *mautrix.RespSync, _ string) error {
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if !puppet.customUser.IsLoggedIn() {
puppet.log.Debugln("Skipping sync processing: custom user not connected to whatsapp")
return nil
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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)
if err != nil {
continue
}
switch evt.Type {
case event.EphemeralEventReceipt:
if puppet.EnableReceipts {
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go puppet.bridge.MatrixHandler.HandleReceipt(evt)
}
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case event.EphemeralEventTyping:
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go puppet.bridge.MatrixHandler.HandleTyping(evt)
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}
}
}
if puppet.EnablePresence {
for _, evt := range resp.Presence.Events {
if evt.Sender != puppet.CustomMXID {
continue
}
err := evt.Content.ParseRaw(evt.Type)
if err != nil {
continue
}
go puppet.bridge.HandlePresence(evt)
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}
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}
return nil
}
func (puppet *Puppet) tryRelogin(cause error, action string) bool {
if !puppet.bridge.Config.CanAutoDoublePuppet(puppet.CustomMXID) {
return false
}
puppet.log.Debugfln("Trying to relogin after '%v' while %s", cause, action)
accessToken, err := puppet.loginWithSharedSecret(puppet.CustomMXID)
if err != nil {
puppet.log.Errorfln("Failed to relogin after '%v' while %s: %v", cause, action, err)
return false
}
puppet.log.Infofln("Successfully relogined after '%v' while %s", cause, action)
puppet.AccessToken = accessToken
return true
}
func (puppet *Puppet) OnFailedSync(_ *mautrix.RespSync, err error) (time.Duration, error) {
puppet.log.Warnln("Sync error:", err)
if errors.Is(err, mautrix.MUnknownToken) {
if !puppet.tryRelogin(err, "syncing") {
return 0, err
}
puppet.customIntent.AccessToken = puppet.AccessToken
return 0, nil
}
return 10 * time.Second, nil
}
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func (puppet *Puppet) GetFilterJSON(_ id.UserID) *mautrix.Filter {
everything := []event.Type{{Type: "*"}}
return &mautrix.Filter{
Presence: mautrix.FilterPart{
Senders: []id.UserID{puppet.CustomMXID},
Types: []event.Type{event.EphemeralEventPresence},
},
AccountData: mautrix.FilterPart{NotTypes: everything},
Room: mautrix.RoomFilter{
Ephemeral: mautrix.FilterPart{Types: []event.Type{event.EphemeralEventTyping, event.EphemeralEventReceipt}},
IncludeLeave: false,
AccountData: mautrix.FilterPart{NotTypes: everything},
State: mautrix.FilterPart{NotTypes: everything},
Timeline: mautrix.FilterPart{NotTypes: everything},
},
}
}
func (puppet *Puppet) SaveFilterID(_ id.UserID, _ string) {}
func (puppet *Puppet) SaveNextBatch(_ id.UserID, nbt string) { puppet.NextBatch = nbt; puppet.Update() }
func (puppet *Puppet) SaveRoom(_ *mautrix.Room) {}
func (puppet *Puppet) LoadFilterID(_ id.UserID) string { return "" }
func (puppet *Puppet) LoadNextBatch(_ id.UserID) string { return puppet.NextBatch }
func (puppet *Puppet) LoadRoom(_ id.RoomID) *mautrix.Room { return nil }