Add support for deleting messages from discord

bridge/portal.go

@@ -32,8 +32,6 @@ type Portal struct {
 	bridge *Bridge
 	log    log.Logger
 
-	channel *discordgo.Channel
-
 	roomCreateLock sync.Mutex
 
 	discordMessages chan portalDiscordMessage
@@ -159,39 +157,22 @@ func (p *Portal) messageLoop() {
 }
 
 func (p *Portal) IsPrivateChat() bool {
-	if p.channel != nil {
-		return p.channel.Type == discordgo.ChannelTypeDM
-	}
-
-	return false
+	return p.Type == discordgo.ChannelTypeDM
 }
 
 func (p *Portal) MainIntent() *appservice.IntentAPI {
-	if p.IsPrivateChat() && p.channel != nil && len(p.channel.Recipients) == 1 {
-		return p.bridge.GetPuppetByID(p.channel.Recipients[0].ID).DefaultIntent()
+	if p.IsPrivateChat() && p.DMUser != "" {
+		return p.bridge.GetPuppetByID(p.DMUser).DefaultIntent()
 	}
 
 	return p.bridge.bot
 }
 
-func (p *Portal) getMessagePuppet(user *User, message *discordgo.Message) *Puppet {
-	p.log.Debugf("getMessagePuppet")
-	if message.Author.ID == user.ID {
-		return p.bridge.GetPuppetByID(user.ID)
-	}
-
-	puppet := p.bridge.GetPuppetByID(message.Author.ID)
-	puppet.SyncContact(user)
-
-	return puppet
-}
-
-func (p *Portal) getMessageIntent(user *User, message *discordgo.Message) *appservice.IntentAPI {
-	return p.getMessagePuppet(user, message).IntentFor(p)
-}
-
 func (p *Portal) createMatrixRoom(user *User, channel *discordgo.Channel) error {
-	p.channel = channel
+	p.Type = channel.Type
+	if p.Type == discordgo.ChannelTypeDM {
+		p.DMUser = channel.Recipients[0].ID
+	}
 
 	p.roomCreateLock.Lock()
 	defer p.roomCreateLock.Unlock()
@@ -288,7 +269,9 @@ func (p *Portal) handleDiscordMessages(msg portalDiscordMessage) {
 
 	switch msg.msg.(type) {
 	case *discordgo.MessageCreate:
-		p.handleDiscordMessage(msg.user, msg.msg.(*discordgo.MessageCreate).Message)
+		p.handleDiscordMessageCreate(msg.user, msg.msg.(*discordgo.MessageCreate).Message)
+	case *discordgo.MessageDelete:
+		p.handleDiscordMessageDelete(msg.user, msg.msg.(*discordgo.MessageDelete).Message)
 	case *discordgo.MessageReactionAdd:
 		p.handleDiscordReaction(msg.user, msg.msg.(*discordgo.MessageReactionAdd).MessageReaction, true)
 	case *discordgo.MessageReactionRemove:
@@ -318,7 +301,7 @@ func (p *Portal) markMessageHandled(msg *database.Message, discordID string, mxi
 	return msg
 }
 
-func (p *Portal) handleDiscordMessage(user *User, msg *discordgo.Message) {
+func (p *Portal) handleDiscordMessageCreate(user *User, msg *discordgo.Message) {
 	if user.ID == msg.Author.ID {
 		return
 	}
@@ -353,6 +336,37 @@ func (p *Portal) handleDiscordMessage(user *User, msg *discordgo.Message) {
 	p.markMessageHandled(nil, msg.ID, resp.EventID, msg.Author.ID, ts)
 }
 
+func (p *Portal) handleDiscordMessageDelete(user *User, msg *discordgo.Message) {
+	// The discord delete message object is pretty empty and doesn't include
+	// the author so we have to use the DMUser from the portal that was added
+	// at creation time if we're a DM. We'll might have similar issues when we
+	// add guild message support, but we'll cross that bridge when we get
+	// there.
+
+	// Find the message that we're working with.
+	existing := p.bridge.db.Message.GetByDiscordID(p.Key, msg.ID)
+	if existing == nil {
+		p.log.Debugfln("failed to find message", msg.ID)
+
+		return
+	}
+
+	var intent *appservice.IntentAPI
+
+	if p.Type == discordgo.ChannelTypeDM {
+		intent = p.bridge.GetPuppetByID(p.DMUser).IntentFor(p)
+	} else {
+		p.log.Errorfln("no guilds yet...")
+	}
+
+	_, err := intent.RedactEvent(p.MXID, existing.MatrixID)
+	if err != nil {
+		p.log.Warnfln("Failed to remove message %s: %v", existing.MatrixID, err)
+	}
+
+	existing.Delete()
+}
+
 func (p *Portal) syncParticipants(source *User, participants []*discordgo.User) {
 	for _, participant := range participants {
 		puppet := p.bridge.GetPuppetByID(participant.ID)

bridge/user.go

@@ -212,7 +212,8 @@ func (u *User) Connect() error {
 	u.User.Session.AddHandler(u.channelPinsUpdateHandler)
 	u.User.Session.AddHandler(u.channelUpdateHandler)
 
-	u.User.Session.AddHandler(u.messageHandler)
+	u.User.Session.AddHandler(u.messageCreateHandler)
+	u.User.Session.AddHandler(u.messageDeleteHandler)
 	u.User.Session.AddHandler(u.reactionAddHandler)
 	u.User.Session.AddHandler(u.reactionRemoveHandler)
 
@@ -249,6 +250,11 @@ func (u *User) channelCreateHandler(s *discordgo.Session, c *discordgo.ChannelCr
 
 	portal.Name = c.Name
 	portal.Topic = c.Topic
+	portal.Type = c.Type
+
+	if portal.Type == discordgo.ChannelTypeDM {
+		portal.DMUser = c.Recipients[0].ID
+	}
 
 	if c.Icon != "" {
 		u.log.Debugln("channel icon", c.Icon)
@@ -279,14 +285,32 @@ func (u *User) channelUpdateHandler(s *discordgo.Session, c *discordgo.ChannelUp
 	u.log.Debugln("channel update")
 }
 
-func (u *User) messageHandler(s *discordgo.Session, m *discordgo.MessageCreate) {
+func (u *User) messageCreateHandler(s *discordgo.Session, m *discordgo.MessageCreate) {
 	if m.GuildID != "" {
 		u.log.Debugln("ignoring message for guild")
 
 		return
 	}
 
-	key := database.NewPortalKey(m.ChannelID, u.User.ID)
+	key := database.NewPortalKey(m.ChannelID, u.ID)
+	portal := u.bridge.GetPortalByID(key)
+
+	msg := portalDiscordMessage{
+		msg:  m,
+		user: u,
+	}
+
+	portal.discordMessages <- msg
+}
+
+func (u *User) messageDeleteHandler(s *discordgo.Session, m *discordgo.MessageDelete) {
+	if m.GuildID != "" {
+		u.log.Debugln("ignoring message delete for guild message")
+
+		return
+	}
+
+	key := database.NewPortalKey(m.ChannelID, u.ID)
 	portal := u.bridge.GetPortalByID(key)
 
 	msg := portalDiscordMessage{

database/migrations/01-initial.sql

@@ -9,6 +9,9 @@ CREATE TABLE portal (
 	avatar     TEXT NOT NULL,
 	avatar_url TEXT,
 
+	type INT,
+	dmuser TEXT,
+
 	first_event_id TEXT,
 
 	PRIMARY KEY (channel_id, receiver)

database/portal.go

@@ -3,6 +3,8 @@ package database
 import (
 	"database/sql"
 
+	"github.com/bwmarrin/discordgo"
+
 	log "maunium.net/go/maulogger/v2"
 	"maunium.net/go/mautrix/id"
 )
@@ -20,7 +22,7 @@ type Portal struct {
 	Avatar    string
 	AvatarURL id.ContentURI
 
-	Type   int
+	Type   discordgo.ChannelType
 	DMUser string
 
 	FirstEventID id.EventID
@@ -28,8 +30,11 @@ type Portal struct {
 
 func (p *Portal) Scan(row Scannable) *Portal {
 	var mxid, avatarURL, firstEventID sql.NullString
+	var typ sql.NullInt32
+
+	err := row.Scan(&p.Key.ChannelID, &p.Key.Receiver, &mxid, &p.Name,
+		&p.Topic, &p.Avatar, &avatarURL, &typ, &p.DMUser, &firstEventID)
 
-	err := row.Scan(&p.Key.ChannelID, &p.Key.Receiver, &mxid, &p.Name, &p.Topic, &p.Avatar, &avatarURL, &firstEventID)
 	if err != nil {
 		if err != sql.ErrNoRows {
 			p.log.Errorln("Database scan failed:", err)
@@ -40,6 +45,7 @@ func (p *Portal) Scan(row Scannable) *Portal {
 
 	p.MXID = id.RoomID(mxid.String)
 	p.AvatarURL, _ = id.ParseContentURI(avatarURL.String)
+	p.Type = discordgo.ChannelType(typ.Int32)
 	p.FirstEventID = id.EventID(firstEventID.String)
 
 	return p
@@ -47,11 +53,13 @@ func (p *Portal) Scan(row Scannable) *Portal {
 
 func (p *Portal) Insert() {
 	query := "INSERT INTO portal" +
-		" (channel_id, receiver, mxid, name, topic, avatar, avatar_url, first_event_id)" +
-		" VALUES ($1, $2, $3, $4, $5, $6, $7, $8)"
+		" (channel_id, receiver, mxid, name, topic, avatar, avatar_url," +
+		" type, dmuser, first_event_id)" +
+		" VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10)"
 
 	_, err := p.db.Exec(query, p.Key.ChannelID, p.Key.Receiver, p.MXID,
-		p.Name, p.Topic, p.Avatar, p.AvatarURL.String(), p.FirstEventID.String())
+		p.Name, p.Topic, p.Avatar, p.AvatarURL.String(), p.Type, p.DMUser,
+		p.FirstEventID.String())
 
 	if err != nil {
 		p.log.Warnfln("Failed to insert %s: %v", p.Key, err)
@@ -60,12 +68,13 @@ func (p *Portal) Insert() {
 
 func (p *Portal) Update() {
 	query := "UPDATE portal SET" +
-		" mxid=$1, name=$2, topic=$3, avatar=$4, avatar_url=$5, first_event_id=$6" +
-		" WHERE channel_id=$7 AND receiver=$8"
+		" mxid=$1, name=$2, topic=$3, avatar=$4, avatar_url=$5, type=$6," +
+		" dmuser=$7, first_event_id=$8" +
+		" WHERE channel_id=$9 AND receiver=$10"
 
 	_, err := p.db.Exec(query, p.MXID, p.Name, p.Topic, p.Avatar,
-		p.AvatarURL.String(), p.FirstEventID.String(), p.Key.ChannelID,
-		p.Key.Receiver)
+		p.AvatarURL.String(), p.Type, p.DMUser, p.FirstEventID.String(),
+		p.Key.ChannelID, p.Key.Receiver)
 
 	if err != nil {
 		p.log.Warnfln("Failed to update %s: %v", p.Key, err)