301 lines
9.7 KiB
Go
301 lines
9.7 KiB
Go
package libgm
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import (
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"bytes"
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"crypto/sha256"
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"encoding/base64"
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"fmt"
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"strings"
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"google.golang.org/protobuf/proto"
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"go.mau.fi/mautrix-gmessages/libgm/events"
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"go.mau.fi/mautrix-gmessages/libgm/gmproto"
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)
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type IncomingRPCMessage struct {
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*gmproto.IncomingRPCMessage
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IsOld bool
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Pair *gmproto.RPCPairData
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Gaia *gmproto.RPCGaiaData
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Message *gmproto.RPCMessageData
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DecryptedData []byte
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DecryptedMessage proto.Message
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}
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var responseType = map[gmproto.ActionType]proto.Message{
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gmproto.ActionType_IS_BUGLE_DEFAULT: &gmproto.IsBugleDefaultResponse{},
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gmproto.ActionType_GET_UPDATES: &gmproto.UpdateEvents{},
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gmproto.ActionType_LIST_CONVERSATIONS: &gmproto.ListConversationsResponse{},
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gmproto.ActionType_NOTIFY_DITTO_ACTIVITY: &gmproto.NotifyDittoActivityResponse{},
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gmproto.ActionType_GET_CONVERSATION_TYPE: &gmproto.GetConversationTypeResponse{},
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gmproto.ActionType_GET_CONVERSATION: &gmproto.GetConversationResponse{},
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gmproto.ActionType_LIST_MESSAGES: &gmproto.ListMessagesResponse{},
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gmproto.ActionType_SEND_MESSAGE: &gmproto.SendMessageResponse{},
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gmproto.ActionType_SEND_REACTION: &gmproto.SendReactionResponse{},
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gmproto.ActionType_DELETE_MESSAGE: &gmproto.DeleteMessageResponse{},
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gmproto.ActionType_GET_PARTICIPANTS_THUMBNAIL: &gmproto.GetThumbnailResponse{},
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gmproto.ActionType_GET_CONTACTS_THUMBNAIL: &gmproto.GetThumbnailResponse{},
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gmproto.ActionType_LIST_CONTACTS: &gmproto.ListContactsResponse{},
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gmproto.ActionType_LIST_TOP_CONTACTS: &gmproto.ListTopContactsResponse{},
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gmproto.ActionType_GET_OR_CREATE_CONVERSATION: &gmproto.GetOrCreateConversationResponse{},
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gmproto.ActionType_UPDATE_CONVERSATION: &gmproto.UpdateConversationResponse{},
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}
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func (c *Client) decryptInternalMessage(data *gmproto.IncomingRPCMessage) (*IncomingRPCMessage, error) {
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msg := &IncomingRPCMessage{
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IncomingRPCMessage: data,
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}
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switch data.BugleRoute {
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case gmproto.BugleRoute_PairEvent:
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msg.Pair = &gmproto.RPCPairData{}
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err := proto.Unmarshal(data.GetMessageData(), msg.Pair)
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if err != nil {
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c.Logger.Trace().
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Str("data", base64.StdEncoding.EncodeToString(msg.GetMessageData())).
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Msg("Errored pair event content")
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return nil, fmt.Errorf("failed to decode pair event: %w", err)
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}
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case gmproto.BugleRoute_GaiaEvent:
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msg.Gaia = &gmproto.RPCGaiaData{}
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err := proto.Unmarshal(data.GetMessageData(), msg.Gaia)
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if err != nil {
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c.Logger.Trace().
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Str("data", base64.StdEncoding.EncodeToString(msg.GetMessageData())).
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Msg("Errored gaia event content")
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return nil, fmt.Errorf("failed to decode gaia event: %w", err)
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}
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case gmproto.BugleRoute_DataEvent:
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msg.Message = &gmproto.RPCMessageData{}
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err := proto.Unmarshal(data.GetMessageData(), msg.Message)
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if err != nil {
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c.Logger.Trace().
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Str("data", base64.StdEncoding.EncodeToString(msg.GetMessageData())).
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Msg("Errored data event content")
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return nil, fmt.Errorf("failed to decode data event: %w", err)
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}
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responseStruct, ok := responseType[msg.Message.GetAction()]
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if ok {
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msg.DecryptedMessage = responseStruct.ProtoReflect().New().Interface()
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}
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if msg.Message.EncryptedData != nil {
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msg.DecryptedData, err = c.AuthData.RequestCrypto.Decrypt(msg.Message.EncryptedData)
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if err != nil {
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return nil, fmt.Errorf("failed to decrypt data event: %w", err)
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}
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if msg.DecryptedMessage != nil {
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err = proto.Unmarshal(msg.DecryptedData, msg.DecryptedMessage)
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if err != nil {
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c.Logger.Trace().
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Str("data", base64.StdEncoding.EncodeToString(msg.DecryptedData)).
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Msg("Errored decrypted data event content")
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return nil, fmt.Errorf("failed to decode decrypted data event: %w", err)
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}
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}
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} else if msg.Message.EncryptedData2 != nil {
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msg.DecryptedData, err = c.AuthData.RequestCrypto.Decrypt(msg.Message.EncryptedData2)
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if err != nil {
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return nil, fmt.Errorf("failed to decrypt field 2 in data event: %w", err)
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}
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var ed2c gmproto.EncryptedData2Container
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err = proto.Unmarshal(msg.DecryptedData, &ed2c)
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if err != nil {
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c.Logger.Trace().
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Str("data", base64.StdEncoding.EncodeToString(msg.DecryptedData)).
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Msg("Errored decrypted data event content")
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return nil, fmt.Errorf("failed to decode decrypted field 2 data event: %w", err)
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}
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// Hacky hack to have User.handleAccountChange do the right-ish thing on startup
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if strings.ContainsRune(ed2c.GetAccountChange().GetAccount(), '@') {
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c.triggerEvent(&events.AccountChange{
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AccountChangeOrSomethingEvent: ed2c.GetAccountChange(),
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IsFake: true,
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})
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}
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}
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default:
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return nil, fmt.Errorf("unknown bugle route %d", data.BugleRoute)
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}
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return msg, nil
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}
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func (c *Client) deduplicateHash(id string, hash [32]byte) bool {
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const recentUpdatesLen = len(c.recentUpdates)
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for i := c.recentUpdatesPtr + recentUpdatesLen - 1; i >= c.recentUpdatesPtr; i-- {
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if c.recentUpdates[i%recentUpdatesLen].id == id {
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if c.recentUpdates[i%recentUpdatesLen].hash == hash {
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return true
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} else {
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break
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}
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}
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}
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c.recentUpdates[c.recentUpdatesPtr] = updateDedupItem{id: id, hash: hash}
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c.recentUpdatesPtr = (c.recentUpdatesPtr + 1) % recentUpdatesLen
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return false
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}
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func (c *Client) logContent(res *IncomingRPCMessage, thingID string, contentHash []byte) {
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if c.Logger.Trace().Enabled() && (res.DecryptedData != nil || res.DecryptedMessage != nil) {
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evt := c.Logger.Trace().Bool("is_old", res.IsOld)
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if res.DecryptedMessage != nil {
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evt.Str("proto_name", string(res.DecryptedMessage.ProtoReflect().Descriptor().FullName()))
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}
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if res.DecryptedData != nil {
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evt.Str("data", base64.StdEncoding.EncodeToString(res.DecryptedData))
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if contentHash != nil {
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evt.Str("thing_id", thingID)
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evt.Hex("data_hash", contentHash)
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}
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} else {
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evt.Str("data", "<null>")
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}
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evt.Msg("Got event")
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}
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}
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func (c *Client) deduplicateUpdate(id string, msg *IncomingRPCMessage) bool {
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if msg.DecryptedData != nil {
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contentHash := sha256.Sum256(msg.DecryptedData)
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if c.deduplicateHash(id, contentHash) {
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c.Logger.Trace().
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Str("thing_id", id).
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Hex("data_hash", contentHash[:]).
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Bool("is_old", msg.IsOld).
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Msg("Ignoring duplicate update")
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return true
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}
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c.logContent(msg, id, contentHash[:])
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}
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return false
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}
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func (c *Client) HandleRPCMsg(rawMsg *gmproto.IncomingRPCMessage) {
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msg, err := c.decryptInternalMessage(rawMsg)
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if err != nil {
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c.Logger.Err(err).Str("message_id", rawMsg.ResponseID).Msg("Failed to decode incoming RPC message")
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c.sessionHandler.queueMessageAck(rawMsg.ResponseID)
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return
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}
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c.sessionHandler.queueMessageAck(msg.ResponseID)
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if c.sessionHandler.receiveResponse(msg) {
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return
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}
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logEvt := c.Logger.Debug().
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Str("message_id", msg.ResponseID).
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Stringer("bugle_route", msg.BugleRoute)
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if msg.Message != nil {
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logEvt.Stringer("message_action", msg.Message.Action)
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}
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logEvt.Msg("Received message")
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switch msg.BugleRoute {
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case gmproto.BugleRoute_PairEvent:
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c.handlePairingEvent(msg)
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case gmproto.BugleRoute_GaiaEvent:
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c.handleGaiaPairingEvent(msg)
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case gmproto.BugleRoute_DataEvent:
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if c.skipCount > 0 {
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c.skipCount--
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msg.IsOld = true
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}
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c.handleUpdatesEvent(msg)
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}
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}
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type WrappedMessage struct {
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*gmproto.Message
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IsOld bool
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Data []byte
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}
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var hackyLoggedOutBytes = []byte{0x72, 0x00}
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func (c *Client) handleUpdatesEvent(msg *IncomingRPCMessage) {
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switch msg.Message.Action {
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case gmproto.ActionType_GET_UPDATES:
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if msg.DecryptedData == nil && bytes.Equal(msg.Message.UnencryptedData, hackyLoggedOutBytes) {
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c.triggerEvent(&events.GaiaLoggedOut{})
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return
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}
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if !msg.IsOld {
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c.bumpNextDataReceiveCheck(DefaultBugleDefaultCheckInterval)
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}
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data, ok := msg.DecryptedMessage.(*gmproto.UpdateEvents)
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if !ok {
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c.Logger.Error().
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Type("data_type", msg.DecryptedMessage).
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Bool("is_old", msg.IsOld).
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Msg("Unexpected data type in GET_UPDATES event")
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return
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}
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switch evt := data.Event.(type) {
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case *gmproto.UpdateEvents_UserAlertEvent:
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c.logContent(msg, "", nil)
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if msg.IsOld {
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return
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}
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c.triggerEvent(evt.UserAlertEvent)
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case *gmproto.UpdateEvents_SettingsEvent:
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c.Logger.Debug().
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Str("data", base64.StdEncoding.EncodeToString(msg.DecryptedData)).
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Bool("is_old", msg.IsOld).
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Msg("Got settings event")
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c.triggerEvent(evt.SettingsEvent)
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case *gmproto.UpdateEvents_ConversationEvent:
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for _, part := range evt.ConversationEvent.GetData() {
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if c.deduplicateUpdate(part.GetConversationID(), msg) {
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return
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} else if msg.IsOld {
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c.Logger.Debug().Str("conv_id", part.ConversationID).Msg("Ignoring old conversation event")
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continue
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}
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c.triggerEvent(part)
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}
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case *gmproto.UpdateEvents_MessageEvent:
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for _, part := range evt.MessageEvent.GetData() {
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if c.deduplicateUpdate(part.GetMessageID(), msg) {
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return
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}
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c.triggerEvent(&WrappedMessage{
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Message: part,
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IsOld: msg.IsOld,
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Data: msg.DecryptedData,
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})
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}
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case *gmproto.UpdateEvents_TypingEvent:
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c.logContent(msg, "", nil)
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if msg.IsOld {
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return
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}
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c.triggerEvent(evt.TypingEvent.GetData())
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case *gmproto.UpdateEvents_AccountChange:
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c.logContent(msg, "", nil)
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c.triggerEvent(&events.AccountChange{
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AccountChangeOrSomethingEvent: evt.AccountChange,
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})
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default:
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c.Logger.Warn().
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Str("evt_data", base64.StdEncoding.EncodeToString(msg.GetMessageData())).
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Str("decrypted_data", base64.StdEncoding.EncodeToString(msg.DecryptedData)).
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Msg("Got unknown event type")
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}
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default:
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c.Logger.Debug().
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Str("evt_data", base64.StdEncoding.EncodeToString(msg.GetMessageData())).
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Str("request_id", msg.Message.SessionID).
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Str("action_type", msg.Message.Action.String()).
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Bool("is_old", msg.IsOld).
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Msg("Got unexpected response")
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}
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}
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