d36528400d
Due to how discordgo dispatches events, this would be extraneously logged for every event received.
341 lines
10 KiB
Go
341 lines
10 KiB
Go
// mautrix-discord - A Matrix-Discord puppeting bridge.
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// Copyright (C) 2026 Tulir Asokan
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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package connector
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import (
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"context"
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"fmt"
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"runtime/debug"
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"slices"
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"strconv"
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"time"
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"github.com/bwmarrin/discordgo"
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"github.com/rs/zerolog"
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"maunium.net/go/mautrix/bridgev2"
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"maunium.net/go/mautrix/bridgev2/database"
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"maunium.net/go/mautrix/bridgev2/networkid"
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"maunium.net/go/mautrix/bridgev2/simplevent"
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"maunium.net/go/mautrix/bridgev2/status"
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"go.mau.fi/mautrix-discord/pkg/discordid"
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)
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type DiscordEventMeta struct {
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Type bridgev2.RemoteEventType
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PortalKey networkid.PortalKey
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LogContext func(c zerolog.Context) zerolog.Context
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}
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func (em *DiscordEventMeta) AddLogContext(c zerolog.Context) zerolog.Context {
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if em.LogContext == nil {
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return c
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}
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c = em.LogContext(c)
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return c
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}
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func (em *DiscordEventMeta) GetType() bridgev2.RemoteEventType {
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return em.Type
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}
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func (em *DiscordEventMeta) GetPortalKey() networkid.PortalKey {
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return em.PortalKey
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}
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type DiscordMessage struct {
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*DiscordEventMeta
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Data *discordgo.Message
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Client *DiscordClient
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}
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func (m *DiscordMessage) ConvertEdit(ctx context.Context, portal *bridgev2.Portal, intent bridgev2.MatrixAPI, existing []*database.Message) (*bridgev2.ConvertedEdit, error) {
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log := zerolog.Ctx(ctx).With().
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Str("action", "convert discord edit").Logger()
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ctx = log.WithContext(ctx)
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// FIXME don't redundantly reupload attachments
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convertedEdit := m.Client.connector.MsgConv.ToMatrix(
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ctx,
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portal,
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intent,
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m.Client.UserLogin,
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m.Client.Session,
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m.Data,
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)
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// TODO this is really gross and relies on how we assign incrementing numeric
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// part ids. to return a semantically correct `ConvertedEdit` we should ditch
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// this system
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slices.SortStableFunc(existing, func(a *database.Message, b *database.Message) int {
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ai, _ := strconv.Atoi(string(a.PartID))
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bi, _ := strconv.Atoi(string(b.PartID))
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return ai - bi
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})
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if len(convertedEdit.Parts) != len(existing) {
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// FIXME support # of parts changing; triggerable by removing individual
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// attachments, etc.
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//
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// at the very least we can make this better by handling attachments,
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// which are always(?) at the end
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log.Warn().Int("n_parts_existing", len(existing)).Int("n_parts_after_edit", len(convertedEdit.Parts)).
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Msg("Ignoring message edit that changed number of parts")
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return nil, bridgev2.ErrIgnoringRemoteEvent
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}
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parts := make([]*bridgev2.ConvertedEditPart, 0, len(existing))
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for pi, part := range convertedEdit.Parts {
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parts = append(parts, part.ToEditPart(existing[pi]))
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}
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return &bridgev2.ConvertedEdit{
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ModifiedParts: parts,
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}, nil
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}
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var (
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_ bridgev2.RemoteMessage = (*DiscordMessage)(nil)
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_ bridgev2.RemoteMessageWithTransactionID = (*DiscordMessage)(nil)
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_ bridgev2.RemoteEdit = (*DiscordMessage)(nil)
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_ bridgev2.RemoteMessageRemove = (*DiscordMessage)(nil)
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)
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func (m *DiscordMessage) GetTargetMessage() networkid.MessageID {
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return discordid.MakeMessageID(m.Data.ID)
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}
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func (m *DiscordMessage) GetTransactionID() networkid.TransactionID {
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if m.Data.Nonce == "" {
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return ""
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}
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return networkid.TransactionID(m.Data.Nonce)
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}
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func (m *DiscordMessage) ConvertMessage(ctx context.Context, portal *bridgev2.Portal, intent bridgev2.MatrixAPI) (*bridgev2.ConvertedMessage, error) {
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return m.Client.connector.MsgConv.ToMatrix(ctx, portal, intent, m.Client.UserLogin, m.Client.Session, m.Data), nil
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}
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func (m *DiscordMessage) GetID() networkid.MessageID {
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return discordid.MakeMessageID(m.Data.ID)
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}
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func (m *DiscordMessage) GetSender() bridgev2.EventSender {
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if m.Data.Author == nil {
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// Message deletions don't have a sender associated with them.
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return bridgev2.EventSender{}
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}
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return m.Client.makeEventSender(m.Data.Author)
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}
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func (d *DiscordClient) wrapDiscordMessage(msg *discordgo.Message, typ bridgev2.RemoteEventType) DiscordMessage {
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return DiscordMessage{
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DiscordEventMeta: &DiscordEventMeta{
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Type: typ,
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PortalKey: networkid.PortalKey{
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ID: discordid.MakePortalID(msg.ChannelID),
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Receiver: d.UserLogin.ID,
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},
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},
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Data: msg,
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Client: d,
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}
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}
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type DiscordReaction struct {
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*DiscordEventMeta
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Reaction *discordgo.MessageReaction
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Client *DiscordClient
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}
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func (r *DiscordReaction) GetSender() bridgev2.EventSender {
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return r.Client.makeEventSenderWithID(r.Reaction.UserID)
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}
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func (r *DiscordReaction) GetTargetMessage() networkid.MessageID {
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return discordid.MakeMessageID(r.Reaction.MessageID)
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}
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func (r *DiscordReaction) GetRemovedEmojiID() networkid.EmojiID {
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return discordid.MakeEmojiID(r.Reaction.Emoji.Name)
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}
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var (
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_ bridgev2.RemoteReaction = (*DiscordReaction)(nil)
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_ bridgev2.RemoteReactionRemove = (*DiscordReaction)(nil)
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_ bridgev2.RemoteReactionWithExtraContent = (*DiscordReaction)(nil)
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)
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func (r *DiscordReaction) GetReactionEmoji() (string, networkid.EmojiID) {
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// name is either a grapheme cluster consisting of a Unicode emoji, or the
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// name of a custom emoji.
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name := r.Reaction.Emoji.Name
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return name, discordid.MakeEmojiID(name)
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}
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func (r *DiscordReaction) GetReactionExtraContent() map[string]any {
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extra := make(map[string]any)
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reaction := r.Reaction
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emoji := reaction.Emoji
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if emoji.ID != "" {
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// The emoji is a custom emoji.
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extra["fi.mau.discord.reaction"] = map[string]any{
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"id": emoji.ID,
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"name": emoji.Name,
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// FIXME Handle custom emoji.
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// "mxc": reaction,
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}
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wrappedShortcode := fmt.Sprintf(":%s:", reaction.Emoji.Name)
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extra["com.beeper.reaction.shortcode"] = wrappedShortcode
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}
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return extra
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}
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func (d *DiscordClient) wrapDiscordReaction(reaction *discordgo.MessageReaction, beingAdded bool) DiscordReaction {
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evtType := bridgev2.RemoteEventReaction
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if !beingAdded {
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evtType = bridgev2.RemoteEventReactionRemove
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}
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return DiscordReaction{
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DiscordEventMeta: &DiscordEventMeta{
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Type: evtType,
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PortalKey: networkid.PortalKey{
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ID: discordid.MakePortalID(reaction.ChannelID),
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Receiver: d.UserLogin.ID,
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},
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},
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Reaction: reaction,
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Client: d,
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}
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}
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func (d *DiscordClient) handleDiscordTyping(ctx context.Context, typing *discordgo.TypingStart) {
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if typing.UserID == d.Session.State.User.ID {
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return
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}
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log := zerolog.Ctx(ctx)
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portalKey := networkid.PortalKey{
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ID: discordid.MakePortalID(typing.ChannelID),
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Receiver: d.UserLogin.ID,
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}
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portal, err := d.connector.Bridge.GetExistingPortalByKey(ctx, portalKey)
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if err != nil {
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log.Err(err).Msg("Failed to query for existing portal")
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return
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}
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if portal == nil || portal.MXID == "" {
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return
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}
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// Make sure we have this user's info in case we haven't seen them at all yet.
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_ = d.userCache.Resolve(ctx, typing.UserID)
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d.UserLogin.Bridge.QueueRemoteEvent(d.UserLogin, &simplevent.Typing{
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EventMeta: simplevent.EventMeta{
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Type: bridgev2.RemoteEventTyping,
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PortalKey: portalKey,
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Sender: d.makeEventSenderWithID(typing.UserID),
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},
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Timeout: 12 * time.Second,
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Type: bridgev2.TypingTypeText,
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})
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}
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func (d *DiscordClient) handleDiscordEvent(rawEvt any) {
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defer func() {
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err := recover()
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if err != nil {
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d.UserLogin.Log.Error().
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Bytes(zerolog.ErrorStackFieldName, debug.Stack()).
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Any(zerolog.ErrorFieldName, err).
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Msg("Panic in Discord event handler")
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}
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}()
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log := d.UserLogin.Log.With().Str("action", "handle discord event").
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Type("event_type", rawEvt).
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Logger()
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ctx := log.WithContext(d.UserLogin.Bridge.BackgroundCtx)
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// NOTE: discordgo seemingly dispatches both the proper unmarshalled type
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// (e.g. `*discordgo.TypingStart`) _as well as_ a "raw" *discordgo.Event
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// (e.g. `*discordgo.Event` with `Type` of `TYPING_START`) for every gateway
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// event
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switch evt := rawEvt.(type) {
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case *discordgo.Ready:
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log.Info().Msg("Received READY dispatch from discordgo")
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d.userCache.UpdateWithReady(evt)
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d.UserLogin.BridgeState.Send(status.BridgeState{
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StateEvent: status.StateConnected,
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})
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case *discordgo.TypingStart:
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d.handleDiscordTyping(ctx, evt)
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case *discordgo.Resumed:
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log.Info().Msg("Received RESUMED dispatch from discordgo")
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d.UserLogin.BridgeState.Send(status.BridgeState{
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StateEvent: status.StateConnected,
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})
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case *discordgo.MessageCreate:
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if evt.Author == nil {
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log.Trace().Int("message_type", int(evt.Message.Type)).
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Str("guild_id", evt.GuildID).
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Str("message_id", evt.ID).
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Str("channel_id", evt.ChannelID).
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Msg("Dropping message that lacks an author")
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return
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}
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d.userCache.UpdateWithMessage(evt.Message)
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wrappedEvt := d.wrapDiscordMessage(evt.Message, bridgev2.RemoteEventMessage)
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d.UserLogin.Bridge.QueueRemoteEvent(d.UserLogin, &wrappedEvt)
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case *discordgo.MessageUpdate:
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wrappedEvt := d.wrapDiscordMessage(evt.Message, bridgev2.RemoteEventEdit)
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d.UserLogin.Bridge.QueueRemoteEvent(d.UserLogin, &wrappedEvt)
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case *discordgo.UserUpdate:
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d.userCache.UpdateWithUserUpdate(evt)
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case *discordgo.MessageDelete:
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wrappedEvt := d.wrapDiscordMessage(evt.Message, bridgev2.RemoteEventMessageRemove)
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d.UserLogin.Bridge.QueueRemoteEvent(d.UserLogin, &wrappedEvt)
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// TODO *discordgo.MessageDeleteBulk
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case *discordgo.MessageReactionAdd:
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wrappedEvt := d.wrapDiscordReaction(evt.MessageReaction, true)
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d.UserLogin.Bridge.QueueRemoteEvent(d.UserLogin, &wrappedEvt)
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case *discordgo.MessageReactionRemove:
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wrappedEvt := d.wrapDiscordReaction(evt.MessageReaction, false)
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d.UserLogin.Bridge.QueueRemoteEvent(d.UserLogin, &wrappedEvt)
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// TODO case *discordgo.MessageReactionRemoveAll:
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// TODO case *discordgo.MessageReactionRemoveEmoji: (needs impl. in discordgo)
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case *discordgo.PresenceUpdate:
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return
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case *discordgo.GuildDelete:
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if evt.Unavailable {
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log.Warn().Str("guild_id", evt.ID).Msg("Guild became unavailable")
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// For now, leave the portals alone if the guild only went away due to an outage.
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return
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}
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d.deleteGuildPortalSpace(ctx, evt.ID)
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}
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}
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