mirror of
https://github.com/matrix-org/dendrite
synced 2024-11-14 22:01:13 +01:00
360 lines
12 KiB
Go
360 lines
12 KiB
Go
// Copyright 2020 The Matrix.org Foundation C.I.C.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package perform
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import (
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"context"
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"errors"
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"fmt"
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"strings"
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"time"
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fsAPI "github.com/matrix-org/dendrite/federationsender/api"
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"github.com/matrix-org/dendrite/internal/eventutil"
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"github.com/matrix-org/dendrite/roomserver/api"
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rsAPI "github.com/matrix-org/dendrite/roomserver/api"
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"github.com/matrix-org/dendrite/roomserver/internal/helpers"
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"github.com/matrix-org/dendrite/roomserver/internal/input"
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"github.com/matrix-org/dendrite/roomserver/storage"
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"github.com/matrix-org/dendrite/setup/config"
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"github.com/matrix-org/gomatrixserverlib"
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"github.com/sirupsen/logrus"
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)
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type Joiner struct {
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ServerName gomatrixserverlib.ServerName
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Cfg *config.RoomServer
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FSAPI fsAPI.FederationSenderInternalAPI
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RSAPI rsAPI.RoomserverInternalAPI
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DB storage.Database
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Inputer *input.Inputer
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}
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// PerformJoin handles joining matrix rooms, including over federation by talking to the federationsender.
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func (r *Joiner) PerformJoin(
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ctx context.Context,
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req *api.PerformJoinRequest,
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res *api.PerformJoinResponse,
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) {
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roomID, joinedVia, err := r.performJoin(ctx, req)
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if err != nil {
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perr, ok := err.(*api.PerformError)
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if ok {
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res.Error = perr
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} else {
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res.Error = &api.PerformError{
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Msg: err.Error(),
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}
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}
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}
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res.RoomID = roomID
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res.JoinedVia = joinedVia
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}
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func (r *Joiner) performJoin(
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ctx context.Context,
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req *api.PerformJoinRequest,
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) (string, gomatrixserverlib.ServerName, error) {
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_, domain, err := gomatrixserverlib.SplitID('@', req.UserID)
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if err != nil {
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return "", "", &api.PerformError{
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Code: api.PerformErrorBadRequest,
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Msg: fmt.Sprintf("Supplied user ID %q in incorrect format", req.UserID),
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}
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}
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if domain != r.Cfg.Matrix.ServerName {
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return "", "", &api.PerformError{
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Code: api.PerformErrorBadRequest,
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Msg: fmt.Sprintf("User %q does not belong to this homeserver", req.UserID),
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}
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}
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if strings.HasPrefix(req.RoomIDOrAlias, "!") {
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return r.performJoinRoomByID(ctx, req)
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}
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if strings.HasPrefix(req.RoomIDOrAlias, "#") {
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return r.performJoinRoomByAlias(ctx, req)
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}
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return "", "", &api.PerformError{
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Code: api.PerformErrorBadRequest,
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Msg: fmt.Sprintf("Room ID or alias %q is invalid", req.RoomIDOrAlias),
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}
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}
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func (r *Joiner) performJoinRoomByAlias(
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ctx context.Context,
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req *api.PerformJoinRequest,
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) (string, gomatrixserverlib.ServerName, error) {
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// Get the domain part of the room alias.
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_, domain, err := gomatrixserverlib.SplitID('#', req.RoomIDOrAlias)
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if err != nil {
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return "", "", fmt.Errorf("Alias %q is not in the correct format", req.RoomIDOrAlias)
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}
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req.ServerNames = append(req.ServerNames, domain)
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// Check if this alias matches our own server configuration. If it
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// doesn't then we'll need to try a federated join.
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var roomID string
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if domain != r.Cfg.Matrix.ServerName {
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// The alias isn't owned by us, so we will need to try joining using
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// a remote server.
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dirReq := fsAPI.PerformDirectoryLookupRequest{
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RoomAlias: req.RoomIDOrAlias, // the room alias to lookup
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ServerName: domain, // the server to ask
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}
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dirRes := fsAPI.PerformDirectoryLookupResponse{}
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err = r.FSAPI.PerformDirectoryLookup(ctx, &dirReq, &dirRes)
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if err != nil {
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logrus.WithError(err).Errorf("error looking up alias %q", req.RoomIDOrAlias)
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return "", "", fmt.Errorf("Looking up alias %q over federation failed: %w", req.RoomIDOrAlias, err)
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}
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roomID = dirRes.RoomID
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req.ServerNames = append(req.ServerNames, dirRes.ServerNames...)
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} else {
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var getRoomReq = rsAPI.GetRoomIDForAliasRequest{
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Alias: req.RoomIDOrAlias,
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IncludeAppservices: true,
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}
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var getRoomRes = rsAPI.GetRoomIDForAliasResponse{}
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// Otherwise, look up if we know this room alias locally.
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err = r.RSAPI.GetRoomIDForAlias(ctx, &getRoomReq, &getRoomRes)
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if err != nil {
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return "", "", fmt.Errorf("Lookup room alias %q failed: %w", req.RoomIDOrAlias, err)
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}
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roomID = getRoomRes.RoomID
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}
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// If the room ID is empty then we failed to look up the alias.
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if roomID == "" {
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return "", "", fmt.Errorf("Alias %q not found", req.RoomIDOrAlias)
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}
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// If we do, then pluck out the room ID and continue the join.
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req.RoomIDOrAlias = roomID
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return r.performJoinRoomByID(ctx, req)
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}
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// TODO: Break this function up a bit
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func (r *Joiner) performJoinRoomByID(
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ctx context.Context,
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req *api.PerformJoinRequest,
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) (string, gomatrixserverlib.ServerName, error) {
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// The original client request ?server_name=... may include this HS so filter that out so we
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// don't attempt to make_join with ourselves
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for i := 0; i < len(req.ServerNames); i++ {
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if req.ServerNames[i] == r.Cfg.Matrix.ServerName {
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// delete this entry
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req.ServerNames = append(req.ServerNames[:i], req.ServerNames[i+1:]...)
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i--
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}
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}
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// Get the domain part of the room ID.
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_, domain, err := gomatrixserverlib.SplitID('!', req.RoomIDOrAlias)
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if err != nil {
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return "", "", &api.PerformError{
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Code: api.PerformErrorBadRequest,
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Msg: fmt.Sprintf("Room ID %q is invalid: %s", req.RoomIDOrAlias, err),
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}
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}
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// If the server name in the room ID isn't ours then it's a
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// possible candidate for finding the room via federation. Add
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// it to the list of servers to try.
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if domain != r.Cfg.Matrix.ServerName {
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req.ServerNames = append(req.ServerNames, domain)
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}
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// Prepare the template for the join event.
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userID := req.UserID
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eb := gomatrixserverlib.EventBuilder{
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Type: gomatrixserverlib.MRoomMember,
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Sender: userID,
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StateKey: &userID,
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RoomID: req.RoomIDOrAlias,
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Redacts: "",
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}
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if err = eb.SetUnsigned(struct{}{}); err != nil {
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return "", "", fmt.Errorf("eb.SetUnsigned: %w", err)
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}
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// It is possible for the request to include some "content" for the
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// event. We'll always overwrite the "membership" key, but the rest,
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// like "display_name" or "avatar_url", will be kept if supplied.
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if req.Content == nil {
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req.Content = map[string]interface{}{}
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}
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req.Content["membership"] = gomatrixserverlib.Join
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if err = eb.SetContent(req.Content); err != nil {
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return "", "", fmt.Errorf("eb.SetContent: %w", err)
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}
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// Force a federated join if we aren't in the room and we've been
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// given some server names to try joining by.
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serverInRoom, _ := helpers.IsServerCurrentlyInRoom(ctx, r.DB, r.ServerName, req.RoomIDOrAlias)
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forceFederatedJoin := len(req.ServerNames) > 0 && !serverInRoom
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// Force a federated join if we're dealing with a pending invite
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// and we aren't in the room.
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isInvitePending, inviteSender, _, err := helpers.IsInvitePending(ctx, r.DB, req.RoomIDOrAlias, req.UserID)
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if err == nil && isInvitePending {
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_, inviterDomain, ierr := gomatrixserverlib.SplitID('@', inviteSender)
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if ierr != nil {
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return "", "", fmt.Errorf("gomatrixserverlib.SplitID: %w", err)
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}
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// If we were invited by someone from another server then we can
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// assume they are in the room so we can join via them.
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if inviterDomain != r.Cfg.Matrix.ServerName {
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req.ServerNames = append(req.ServerNames, inviterDomain)
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forceFederatedJoin = true
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}
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}
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// If we should do a forced federated join then do that.
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var joinedVia gomatrixserverlib.ServerName
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if forceFederatedJoin {
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joinedVia, err = r.performFederatedJoinRoomByID(ctx, req)
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return req.RoomIDOrAlias, joinedVia, err
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}
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// Try to construct an actual join event from the template.
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// If this succeeds then it is a sign that the room already exists
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// locally on the homeserver.
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// TODO: Check what happens if the room exists on the server
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// but everyone has since left. I suspect it does the wrong thing.
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event, buildRes, err := buildEvent(ctx, r.DB, r.Cfg.Matrix, &eb)
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switch err {
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case nil:
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// The room join is local. Send the new join event into the
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// roomserver. First of all check that the user isn't already
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// a member of the room.
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alreadyJoined := false
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for _, se := range buildRes.StateEvents {
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if !se.StateKeyEquals(userID) {
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continue
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}
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if membership, merr := se.Membership(); merr == nil {
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alreadyJoined = (membership == gomatrixserverlib.Join)
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break
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}
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}
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// If we haven't already joined the room then send an event
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// into the room changing our membership status.
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if !alreadyJoined {
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inputReq := api.InputRoomEventsRequest{
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InputRoomEvents: []api.InputRoomEvent{
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{
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Kind: api.KindNew,
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Event: event.Headered(buildRes.RoomVersion),
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AuthEventIDs: event.AuthEventIDs(),
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SendAsServer: string(r.Cfg.Matrix.ServerName),
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},
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},
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}
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inputRes := api.InputRoomEventsResponse{}
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r.Inputer.InputRoomEvents(ctx, &inputReq, &inputRes)
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if err = inputRes.Err(); err != nil {
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return "", "", &api.PerformError{
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Code: api.PerformErrorNotAllowed,
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Msg: fmt.Sprintf("InputRoomEvents auth failed: %s", err),
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}
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}
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}
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case eventutil.ErrRoomNoExists:
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// The room doesn't exist locally. If the room ID looks like it should
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// be ours then this probably means that we've nuked our database at
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// some point.
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if domain == r.Cfg.Matrix.ServerName {
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// If there are no more server names to try then give up here.
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// Otherwise we'll try a federated join as normal, since it's quite
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// possible that the room still exists on other servers.
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if len(req.ServerNames) == 0 {
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return "", "", &api.PerformError{
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Code: api.PerformErrorNoRoom,
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Msg: fmt.Sprintf("Room ID %q does not exist", req.RoomIDOrAlias),
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}
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}
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}
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// Perform a federated room join.
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joinedVia, err = r.performFederatedJoinRoomByID(ctx, req)
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return req.RoomIDOrAlias, joinedVia, err
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default:
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// Something else went wrong.
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return "", "", fmt.Errorf("Error joining local room: %q", err)
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}
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// By this point, if req.RoomIDOrAlias contained an alias, then
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// it will have been overwritten with a room ID by performJoinRoomByAlias.
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// We should now include this in the response so that the CS API can
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// return the right room ID.
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return req.RoomIDOrAlias, r.Cfg.Matrix.ServerName, nil
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}
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func (r *Joiner) performFederatedJoinRoomByID(
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ctx context.Context,
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req *api.PerformJoinRequest,
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) (gomatrixserverlib.ServerName, error) {
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// Try joining by all of the supplied server names.
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fedReq := fsAPI.PerformJoinRequest{
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RoomID: req.RoomIDOrAlias, // the room ID to try and join
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UserID: req.UserID, // the user ID joining the room
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ServerNames: req.ServerNames, // the server to try joining with
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Content: req.Content, // the membership event content
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}
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fedRes := fsAPI.PerformJoinResponse{}
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r.FSAPI.PerformJoin(ctx, &fedReq, &fedRes)
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if fedRes.LastError != nil {
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return "", &api.PerformError{
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Code: api.PerformErrRemote,
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Msg: fedRes.LastError.Message,
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RemoteCode: fedRes.LastError.Code,
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}
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}
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return fedRes.JoinedVia, nil
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}
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func buildEvent(
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ctx context.Context, db storage.Database, cfg *config.Global, builder *gomatrixserverlib.EventBuilder,
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) (*gomatrixserverlib.HeaderedEvent, *api.QueryLatestEventsAndStateResponse, error) {
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eventsNeeded, err := gomatrixserverlib.StateNeededForEventBuilder(builder)
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if err != nil {
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return nil, nil, fmt.Errorf("gomatrixserverlib.StateNeededForEventBuilder: %w", err)
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}
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if len(eventsNeeded.Tuples()) == 0 {
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return nil, nil, errors.New("expecting state tuples for event builder, got none")
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}
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var queryRes api.QueryLatestEventsAndStateResponse
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err = helpers.QueryLatestEventsAndState(ctx, db, &api.QueryLatestEventsAndStateRequest{
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RoomID: builder.RoomID,
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StateToFetch: eventsNeeded.Tuples(),
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}, &queryRes)
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if err != nil {
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return nil, nil, fmt.Errorf("QueryLatestEventsAndState: %w", err)
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}
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ev, err := eventutil.BuildEvent(ctx, builder, cfg, time.Now(), &eventsNeeded, &queryRes)
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if err != nil {
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return nil, nil, err
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}
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return ev, &queryRes, nil
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}
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