107 lines
3.3 KiB
Go
107 lines
3.3 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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"slices"
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"strconv"
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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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var (
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_ bridgev2.BackfillingNetworkAPI = (*DiscordClient)(nil)
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)
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func (dc *DiscordClient) FetchMessages(ctx context.Context, fetchParams bridgev2.FetchMessagesParams) (*bridgev2.FetchMessagesResponse, error) {
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if !dc.IsLoggedIn() {
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return nil, bridgev2.ErrNotLoggedIn
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}
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channelID := string(fetchParams.Portal.ID)
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log := zerolog.Ctx(ctx).With().
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Str("channel_id", channelID).
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Int("desired_count", fetchParams.Count).
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Bool("forward", fetchParams.Forward).Logger()
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var beforeID string
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var afterID string
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if fetchParams.AnchorMessage != nil {
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anchorID := string(fetchParams.AnchorMessage.ID)
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if fetchParams.Forward {
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afterID = anchorID
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} else {
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beforeID = anchorID
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}
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}
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// ChannelMessages returns messages ordered from newest to oldest.
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count := min(fetchParams.Count, 100)
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log.Debug().Msg("Fetching channel history for backfill")
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msgs, err := dc.Session.ChannelMessages(channelID, count, beforeID, afterID, "")
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if err != nil {
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return nil, err
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}
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converted := make([]*bridgev2.BackfillMessage, 0, len(msgs))
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for _, msg := range msgs {
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streamOrder, _ := strconv.ParseInt(msg.ID, 10, 64)
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ts, _ := discordgo.SnowflakeTimestamp(msg.ID)
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// FIXME(skip): Backfill reactions.
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sender := dc.makeEventSender(msg.Author)
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// Use the ghost's intent, falling back to the bridge's.
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ghost, err := dc.connector.Bridge.GetGhostByID(ctx, sender.Sender)
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if err != nil {
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log.Err(err).Msg("Failed to look up ghost while converting backfilled message")
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}
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var intent bridgev2.MatrixAPI
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if ghost == nil {
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intent = fetchParams.Portal.Bridge.Bot
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} else {
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intent = ghost.Intent
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}
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converted = append(converted, &bridgev2.BackfillMessage{
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ID: networkid.MessageID(msg.ID),
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ConvertedMessage: dc.connector.MsgConv.ToMatrix(ctx, fetchParams.Portal, intent, dc.UserLogin, msg),
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Sender: sender,
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Timestamp: ts,
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StreamOrder: streamOrder,
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})
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}
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// FetchMessagesResponse expects messages to always be ordered from oldest to newest.
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slices.Reverse(converted)
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log.Debug().Int("converted_count", len(converted)).Msg("Finished fetching and converting, returning backfill response")
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return &bridgev2.FetchMessagesResponse{
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Messages: converted,
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Forward: fetchParams.Forward,
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// This might not actually be true if the channel's total number of messages is itself a multiple
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// of `count`, but that's probably okay.
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HasMore: len(msgs) == count,
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}, nil
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}
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