226 lines
6.7 KiB
Go
226 lines
6.7 KiB
Go
// mautrix-discord - A Matrix-Discord puppeting bridge.
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// Copyright (C) 2024 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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"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/networkid"
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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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var (
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_ bridgev2.RemoteMessage = (*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) 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.Data), nil
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}
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func (m *DiscordMessage) GetID() networkid.MessageID {
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return networkid.MessageID(m.Data.ID)
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}
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func (m *DiscordMessage) GetSender() bridgev2.EventSender {
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return m.Client.makeEventSender(m.Data.Author)
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}
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func (d *DiscordClient) wrapDiscordMessage(evt *discordgo.MessageCreate) DiscordMessage {
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return DiscordMessage{
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DiscordEventMeta: &DiscordEventMeta{
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Type: bridgev2.RemoteEventMessage,
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PortalKey: networkid.PortalKey{
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ID: networkid.PortalID(evt.ChannelID),
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Receiver: d.UserLogin.ID,
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},
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},
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Data: evt.Message,
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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 networkid.MessageID(r.Reaction.MessageID)
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}
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func (r *DiscordReaction) GetRemovedEmojiID() networkid.EmojiID {
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return networkid.EmojiID(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, networkid.EmojiID(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: networkid.PortalID(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) handleDiscordEvent(rawEvt any) {
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if d.UserLogin == nil {
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// Our event handlers are able to assume that a UserLogin is available.
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// We respond to special events like READY outside of this function,
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// by virtue of methods like Session.Open only returning control flow
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// after RESUME or READY.
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log := zerolog.Ctx(context.TODO())
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log.Trace().Msg("Dropping Discord event received before UserLogin creation")
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return
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}
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if d.Session == nil || d.Session.State == nil || d.Session.State.User == nil {
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// Our event handlers are able to assume that we've fully connected to the
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// gateway.
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d.UserLogin.Log.Debug().Msg("Dropping Discord event received before READY or RESUMED")
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return
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}
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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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switch evt := rawEvt.(type) {
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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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wrappedEvt := d.wrapDiscordMessage(evt)
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d.UserLogin.Bridge.QueueRemoteEvent(d.UserLogin, &wrappedEvt)
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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.Event:
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// For presently unknown reasons sometimes discordgo won't unmarshal
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// events into their proper corresponding structs.
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if evt.Type == "PRESENCE_UPDATE" || evt.Type == "PASSIVE_UPDATE_V2" || evt.Type == "CONVERSATION_SUMMARY_UPDATE" {
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return
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}
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log.Debug().Str("event_type", evt.Type).Msg("Ignoring unknown Discord event")
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}
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}
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