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// Copyright 2024 New Vector Ltd.
// Copyright 2017 Vector Creations Ltd
//
// SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
// Please see LICENSE files in the repository root for full details.
package internal
import (
"context"
"database/sql"
"errors"
"fmt"
"time"
asAPI "github.com/element-hq/dendrite/appservice/api"
"github.com/element-hq/dendrite/internal/eventutil"
"github.com/element-hq/dendrite/roomserver/api"
"github.com/element-hq/dendrite/roomserver/internal/helpers"
"github.com/element-hq/dendrite/roomserver/types"
"github.com/matrix-org/gomatrixserverlib"
"github.com/matrix-org/gomatrixserverlib/spec"
"github.com/tidwall/gjson"
"github.com/tidwall/sjson"
)
// SetRoomAlias implements alias.RoomserverInternalAPI
func (r *RoomserverInternalAPI) SetRoomAlias(
ctx context.Context,
senderID spec.SenderID,
roomID spec.RoomID,
alias string,
) (aliasAlreadyUsed bool, err error) {
// Check if the alias isn't already referring to a room
existingRoomID, err := r.DB.GetRoomIDForAlias(ctx, alias)
if err != nil {
return false, err
}
if len(existingRoomID) > 0 {
// If the alias already exists, stop the process
return true, nil
}
// Save the new alias
if err := r.DB.SetRoomAlias(ctx, alias, roomID.String(), string(senderID)); err != nil {
return false, err
}
return false, nil
}
// GetRoomIDForAlias implements alias.RoomserverInternalAPI
func (r *RoomserverInternalAPI) GetRoomIDForAlias(
ctx context.Context,
request *api.GetRoomIDForAliasRequest,
response *api.GetRoomIDForAliasResponse,
) error {
// Look up the room ID in the database
roomID, err := r.DB.GetRoomIDForAlias(ctx, request.Alias)
if err == nil && roomID != "" {
response.RoomID = roomID
return nil
}
// Check appservice on err, but only if the appservice API is
// wired in and no room ID was found.
if r.asAPI != nil && request.IncludeAppservices && roomID == "" {
// No room found locally, try our application services by making a call to
// the appservice component
aliasReq := &asAPI.RoomAliasExistsRequest{
Alias: request.Alias,
}
aliasRes := &asAPI.RoomAliasExistsResponse{}
if err = r.asAPI.RoomAliasExists(ctx, aliasReq, aliasRes); err != nil {
return err
}
if aliasRes.AliasExists {
roomID, err = r.DB.GetRoomIDForAlias(ctx, request.Alias)
if err != nil {
return err
}
response.RoomID = roomID
return nil
}
}
return err
}
// GetAliasesForRoomID implements alias.RoomserverInternalAPI
func (r *RoomserverInternalAPI) GetAliasesForRoomID(
ctx context.Context,
request *api.GetAliasesForRoomIDRequest,
response *api.GetAliasesForRoomIDResponse,
) error {
// Look up the aliases in the database for the given RoomID
aliases, err := r.DB.GetAliasesForRoomID(ctx, request.RoomID)
if err != nil {
return err
}
response.Aliases = aliases
return nil
}
// nolint:gocyclo
// RemoveRoomAlias implements alias.RoomserverInternalAPI
// nolint: gocyclo
func (r *RoomserverInternalAPI) RemoveRoomAlias(ctx context.Context, senderID spec.SenderID, alias string) (aliasFound bool, aliasRemoved bool, err error) {
roomID, err := r.DB.GetRoomIDForAlias(ctx, alias)
if err != nil {
return false, false, fmt.Errorf("r.DB.GetRoomIDForAlias: %w", err)
}
if roomID == "" {
return false, false, nil
}
validRoomID, err := spec.NewRoomID(roomID)
if err != nil {
return true, false, err
}
sender, err := r.QueryUserIDForSender(ctx, *validRoomID, senderID)
if err != nil || sender == nil {
return true, false, fmt.Errorf("r.QueryUserIDForSender: %w", err)
}
virtualHost := sender.Domain()
creatorID, err := r.DB.GetCreatorIDForAlias(ctx, alias)
if err != nil {
return true, false, fmt.Errorf("r.DB.GetCreatorIDForAlias: %w", err)
}
if spec.SenderID(creatorID) != senderID {
var plEvent *types.HeaderedEvent
var pls *gomatrixserverlib.PowerLevelContent
plEvent, err = r.DB.GetStateEvent(ctx, roomID, spec.MRoomPowerLevels, "")
if err != nil {
return true, false, fmt.Errorf("r.DB.GetStateEvent: %w", err)
}
pls, err = plEvent.PowerLevels()
if err != nil {
return true, false, fmt.Errorf("plEvent.PowerLevels: %w", err)
}
if pls.UserLevel(senderID) < pls.EventLevel(spec.MRoomCanonicalAlias, true) {
return true, false, nil
}
}
ev, err := r.DB.GetStateEvent(ctx, roomID, spec.MRoomCanonicalAlias, "")
if err != nil && err != sql.ErrNoRows {
return true, false, err
} else if ev != nil {
stateAlias := gjson.GetBytes(ev.Content(), "alias").Str
// the alias to remove is currently set as the canonical alias, remove it
if stateAlias == alias {
res, err := sjson.DeleteBytes(ev.Content(), "alias")
if err != nil {
return true, false, err
}
canonicalSenderID := ev.SenderID()
canonicalSender, err := r.QueryUserIDForSender(ctx, *validRoomID, canonicalSenderID)
if err != nil || canonicalSender == nil {
return true, false, err
}
validRoomID, err := spec.NewRoomID(roomID)
if err != nil {
return true, false, err
}
identity, err := r.SigningIdentityFor(ctx, *validRoomID, *canonicalSender)
if err != nil {
return true, false, err
}
proto := &gomatrixserverlib.ProtoEvent{
SenderID: string(canonicalSenderID),
RoomID: ev.RoomID().String(),
Type: ev.Type(),
StateKey: ev.StateKey(),
Content: res,
}
eventsNeeded, err := gomatrixserverlib.StateNeededForProtoEvent(proto)
if err != nil {
return true, false, fmt.Errorf("gomatrixserverlib.StateNeededForEventBuilder: %w", err)
}
if len(eventsNeeded.Tuples()) == 0 {
return true, false, errors.New("expecting state tuples for event builder, got none")
}
stateRes := &api.QueryLatestEventsAndStateResponse{}
if err = helpers.QueryLatestEventsAndState(ctx, r.DB, r, &api.QueryLatestEventsAndStateRequest{RoomID: roomID, StateToFetch: eventsNeeded.Tuples()}, stateRes); err != nil {
return true, false, err
}
newEvent, err := eventutil.BuildEvent(ctx, proto, &identity, time.Now(), &eventsNeeded, stateRes)
if err != nil {
return true, false, err
}
err = api.SendEvents(ctx, r, api.KindNew, []*types.HeaderedEvent{newEvent}, virtualHost, r.ServerName, r.ServerName, nil, false)
if err != nil {
return true, false, err
}
}
}
// Remove the alias from the database
if err := r.DB.RemoveRoomAlias(ctx, alias); err != nil {
return true, false, err
}
return true, true, nil
}
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