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package streams
import (
"context"
"crypto/sha256"
"encoding/base64"
"math"
"strconv"
"time"
"github.com/matrix-org/gomatrixserverlib"
"github.com/matrix-org/dendrite/syncapi/storage"
"github.com/matrix-org/dendrite/syncapi/synctypes"
"github.com/matrix-org/dendrite/syncapi/types"
)
type InviteStreamProvider struct {
DefaultStreamProvider
}
func (p *InviteStreamProvider) Setup(
ctx context.Context, snapshot storage.DatabaseTransaction,
) {
p.DefaultStreamProvider.Setup(ctx, snapshot)
p.latestMutex.Lock()
defer p.latestMutex.Unlock()
id, err := snapshot.MaxStreamPositionForInvites(ctx)
if err != nil {
panic(err)
}
p.latest = id
}
func (p *InviteStreamProvider) CompleteSync(
ctx context.Context,
snapshot storage.DatabaseTransaction,
req *types.SyncRequest,
) types.StreamPosition {
return p.IncrementalSync(ctx, snapshot, req, 0, p.LatestPosition(ctx))
}
func (p *InviteStreamProvider) IncrementalSync(
ctx context.Context,
snapshot storage.DatabaseTransaction,
req *types.SyncRequest,
from, to types.StreamPosition,
) types.StreamPosition {
r := types.Range{
From: from,
To: to,
}
invites, retiredInvites, maxID, err := snapshot.InviteEventsInRange(
ctx, req.Device.UserID, r,
)
if err != nil {
req.Log.WithError(err).Error("p.DB.InviteEventsInRange failed")
return from
}
for roomID, inviteEvent := range invites {
// skip ignored user events
if _, ok := req.IgnoredUsers.List[inviteEvent.Sender()]; ok {
continue
}
ir := types.NewInviteResponse(inviteEvent)
req.Response.Rooms.Invite[roomID] = ir
}
// When doing an initial sync, we don't want to add retired invites, as this
// can add rooms we were invited to, but already left.
if from == 0 {
return to
}
for roomID := range retiredInvites {
membership, _, err := snapshot.SelectMembershipForUser(ctx, roomID, req.Device.UserID, math.MaxInt64)
// Skip if the user is an existing member of the room.
// Otherwise, the NewLeaveResponse will eject the user from the room unintentionally
if membership == gomatrixserverlib.Join ||
err != nil {
continue
}
lr := types.NewLeaveResponse()
h := sha256.Sum256(append([]byte(roomID), []byte(strconv.FormatInt(int64(to), 10))...))
lr.Timeline.Events = append(lr.Timeline.Events, synctypes.ClientEvent{
// fake event ID which muxes in the to position
EventID: "$" + base64.RawURLEncoding.EncodeToString(h[:]),
OriginServerTS: gomatrixserverlib.AsTimestamp(time.Now()),
RoomID: roomID,
Sender: req.Device.UserID,
StateKey: &req.Device.UserID,
Type: "m.room.member",
Content: gomatrixserverlib.RawJSON(`{"membership":"leave"}`),
})
req.Response.Rooms.Leave[roomID] = lr
}
return maxID
}
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