Implement attachments for Discord -> Matrix

database/attachment.go

@@ -0,0 +1,70 @@
+package database
+
+import (
+	"database/sql"
+	"errors"
+
+	log "maunium.net/go/maulogger/v2"
+	"maunium.net/go/mautrix/id"
+)
+
+type Attachment struct {
+	db  *Database
+	log log.Logger
+
+	Channel PortalKey
+
+	DiscordMessageID    string
+	DiscordAttachmentID string
+	MatrixEventID       id.EventID
+}
+
+func (a *Attachment) Scan(row Scannable) *Attachment {
+	err := row.Scan(
+		&a.Channel.ChannelID, &a.Channel.Receiver,
+		&a.DiscordMessageID, &a.DiscordAttachmentID,
+		&a.MatrixEventID)
+
+	if err != nil {
+		if !errors.Is(err, sql.ErrNoRows) {
+			a.log.Errorln("Database scan failed:", err)
+		}
+
+		return nil
+	}
+
+	return a
+}
+
+func (a *Attachment) Insert() {
+	query := "INSERT INTO attachment" +
+		" (channel_id, receiver, discord_message_id, discord_attachment_id, " +
+		" matrix_event_id) VALUES ($1, $2, $3, $4, $5);"
+
+	_, err := a.db.Exec(
+		query,
+		a.Channel.ChannelID, a.Channel.Receiver,
+		a.DiscordMessageID, a.DiscordAttachmentID,
+		a.MatrixEventID,
+	)
+
+	if err != nil {
+		a.log.Warnfln("Failed to insert attachment for %s@%s: %v", a.Channel, a.DiscordMessageID, err)
+	}
+}
+
+func (a *Attachment) Delete() {
+	query := "DELETE FROM attachment WHERE" +
+		" channel_id=$1 AND receiver=$2 AND discord_attachment_id=$3 AND" +
+		" matrix_event_id=$4"
+
+	_, err := a.db.Exec(
+		query,
+		a.Channel.ChannelID, a.Channel.Receiver,
+		a.DiscordAttachmentID, a.MatrixEventID,
+	)
+
+	if err != nil {
+		a.log.Warnfln("Failed to delete attachment for %s@%s: %v", a.Channel, a.DiscordAttachmentID, err)
+	}
+}