334 lines
11 KiB
Go
334 lines
11 KiB
Go
// Copyright 2017 Vector Creations Ltd
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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 routing
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import (
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"fmt"
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"net/http"
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"strings"
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"time"
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"github.com/matrix-org/dendrite/clientapi/auth/authtypes"
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"github.com/matrix-org/dendrite/clientapi/auth/storage/accounts"
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"github.com/matrix-org/dendrite/clientapi/httputil"
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"github.com/matrix-org/dendrite/clientapi/jsonerror"
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"github.com/matrix-org/dendrite/clientapi/producers"
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"github.com/matrix-org/dendrite/common"
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"github.com/matrix-org/dendrite/common/config"
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roomserverAPI "github.com/matrix-org/dendrite/roomserver/api"
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"github.com/matrix-org/gomatrix"
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"github.com/matrix-org/gomatrixserverlib"
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"github.com/matrix-org/util"
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)
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// JoinRoomByIDOrAlias implements the "/join/{roomIDOrAlias}" API.
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// https://matrix.org/docs/spec/client_server/r0.2.0.html#post-matrix-client-r0-join-roomidoralias
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func JoinRoomByIDOrAlias(
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req *http.Request,
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device *authtypes.Device,
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roomIDOrAlias string,
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cfg config.Dendrite,
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federation *gomatrixserverlib.FederationClient,
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producer *producers.RoomserverProducer,
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queryAPI roomserverAPI.RoomserverQueryAPI,
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aliasAPI roomserverAPI.RoomserverAliasAPI,
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keyRing gomatrixserverlib.KeyRing,
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accountDB *accounts.Database,
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) util.JSONResponse {
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var content map[string]interface{} // must be a JSON object
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if resErr := httputil.UnmarshalJSONRequest(req, &content); resErr != nil {
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return *resErr
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}
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evTime, err := httputil.ParseTSParam(req)
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if err != nil {
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return util.JSONResponse{
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Code: http.StatusBadRequest,
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JSON: jsonerror.InvalidArgumentValue(err.Error()),
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}
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}
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localpart, _, err := gomatrixserverlib.SplitID('@', device.UserID)
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if err != nil {
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return httputil.LogThenError(req, err)
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}
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profile, err := accountDB.GetProfileByLocalpart(req.Context(), localpart)
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if err != nil {
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return httputil.LogThenError(req, err)
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}
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content["membership"] = "join"
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content["displayname"] = profile.DisplayName
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content["avatar_url"] = profile.AvatarURL
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r := joinRoomReq{
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req, evTime, content, device.UserID, cfg, federation, producer, queryAPI, aliasAPI, keyRing,
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}
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if strings.HasPrefix(roomIDOrAlias, "!") {
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return r.joinRoomByID(roomIDOrAlias)
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}
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if strings.HasPrefix(roomIDOrAlias, "#") {
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return r.joinRoomByAlias(roomIDOrAlias)
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}
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return util.JSONResponse{
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Code: http.StatusBadRequest,
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JSON: jsonerror.BadJSON("Invalid first character for room ID or alias"),
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}
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}
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type joinRoomReq struct {
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req *http.Request
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evTime time.Time
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content map[string]interface{}
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userID string
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cfg config.Dendrite
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federation *gomatrixserverlib.FederationClient
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producer *producers.RoomserverProducer
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queryAPI roomserverAPI.RoomserverQueryAPI
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aliasAPI roomserverAPI.RoomserverAliasAPI
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keyRing gomatrixserverlib.KeyRing
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}
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// joinRoomByID joins a room by room ID
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func (r joinRoomReq) joinRoomByID(roomID string) util.JSONResponse {
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// A client should only join a room by room ID when it has an invite
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// to the room. If the server is already in the room then we can
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// lookup the invite and process the request as a normal state event.
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// If the server is not in the room the we will need to look up the
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// remote server the invite came from in order to request a join event
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// from that server.
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queryReq := roomserverAPI.QueryInvitesForUserRequest{
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RoomID: roomID, TargetUserID: r.userID,
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}
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var queryRes roomserverAPI.QueryInvitesForUserResponse
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if err := r.queryAPI.QueryInvitesForUser(r.req.Context(), &queryReq, &queryRes); err != nil {
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return httputil.LogThenError(r.req, err)
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}
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servers := []gomatrixserverlib.ServerName{}
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seenInInviterIDs := map[gomatrixserverlib.ServerName]bool{}
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for _, userID := range queryRes.InviteSenderUserIDs {
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_, domain, err := gomatrixserverlib.SplitID('@', userID)
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if err != nil {
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return httputil.LogThenError(r.req, err)
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}
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if !seenInInviterIDs[domain] {
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servers = append(servers, domain)
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seenInInviterIDs[domain] = true
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}
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}
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// Also add the domain extracted from the roomID as a last resort to join
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// in case the client is erroneously trying to join by ID without an invite
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// or all previous attempts at domains extracted from the inviter IDs fail
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// Note: It's no guarantee we'll succeed because a room isn't bound to the domain in its ID
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_, domain, err := gomatrixserverlib.SplitID('!', roomID)
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if err != nil {
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return httputil.LogThenError(r.req, err)
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}
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if domain != r.cfg.Matrix.ServerName && !seenInInviterIDs[domain] {
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servers = append(servers, domain)
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}
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return r.joinRoomUsingServers(roomID, servers)
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}
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// joinRoomByAlias joins a room using a room alias.
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func (r joinRoomReq) joinRoomByAlias(roomAlias string) util.JSONResponse {
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_, domain, err := gomatrixserverlib.SplitID('#', roomAlias)
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if err != nil {
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return util.JSONResponse{
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Code: http.StatusBadRequest,
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JSON: jsonerror.BadJSON("Room alias must be in the form '#localpart:domain'"),
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}
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}
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if domain == r.cfg.Matrix.ServerName {
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queryReq := roomserverAPI.GetRoomIDForAliasRequest{Alias: roomAlias}
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var queryRes roomserverAPI.GetRoomIDForAliasResponse
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if err = r.aliasAPI.GetRoomIDForAlias(r.req.Context(), &queryReq, &queryRes); err != nil {
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return httputil.LogThenError(r.req, err)
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}
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if len(queryRes.RoomID) > 0 {
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return r.joinRoomUsingServers(queryRes.RoomID, []gomatrixserverlib.ServerName{r.cfg.Matrix.ServerName})
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}
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// If the response doesn't contain a non-empty string, return an error
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return util.JSONResponse{
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Code: http.StatusNotFound,
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JSON: jsonerror.NotFound("Room alias " + roomAlias + " not found."),
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}
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}
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// If the room isn't local, use federation to join
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return r.joinRoomByRemoteAlias(domain, roomAlias)
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}
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func (r joinRoomReq) joinRoomByRemoteAlias(
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domain gomatrixserverlib.ServerName, roomAlias string,
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) util.JSONResponse {
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resp, err := r.federation.LookupRoomAlias(r.req.Context(), domain, roomAlias)
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if err != nil {
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switch x := err.(type) {
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case gomatrix.HTTPError:
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if x.Code == http.StatusNotFound {
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return util.JSONResponse{
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Code: http.StatusNotFound,
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JSON: jsonerror.NotFound("Room alias not found"),
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}
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}
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}
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return httputil.LogThenError(r.req, err)
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}
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return r.joinRoomUsingServers(resp.RoomID, resp.Servers)
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}
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func (r joinRoomReq) writeToBuilder(eb *gomatrixserverlib.EventBuilder, roomID string) error {
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eb.Type = "m.room.member"
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err := eb.SetContent(r.content)
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if err != nil {
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return err
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}
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err = eb.SetUnsigned(struct{}{})
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if err != nil {
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return err
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}
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eb.Sender = r.userID
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eb.StateKey = &r.userID
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eb.RoomID = roomID
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eb.Redacts = ""
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return nil
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}
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func (r joinRoomReq) joinRoomUsingServers(
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roomID string, servers []gomatrixserverlib.ServerName,
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) util.JSONResponse {
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var eb gomatrixserverlib.EventBuilder
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err := r.writeToBuilder(&eb, roomID)
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if err != nil {
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return httputil.LogThenError(r.req, err)
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}
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var queryRes roomserverAPI.QueryLatestEventsAndStateResponse
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event, err := common.BuildEvent(r.req.Context(), &eb, r.cfg, r.evTime, r.queryAPI, &queryRes)
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if err == nil {
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if _, err = r.producer.SendEvents(r.req.Context(), []gomatrixserverlib.Event{*event}, r.cfg.Matrix.ServerName, nil); err != nil {
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return httputil.LogThenError(r.req, err)
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}
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return util.JSONResponse{
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Code: http.StatusOK,
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JSON: struct {
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RoomID string `json:"room_id"`
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}{roomID},
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}
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}
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if err != common.ErrRoomNoExists {
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return httputil.LogThenError(r.req, err)
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}
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if len(servers) == 0 {
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return util.JSONResponse{
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Code: http.StatusNotFound,
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JSON: jsonerror.NotFound("No candidate servers found for room"),
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}
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}
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var lastErr error
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for _, server := range servers {
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var response *util.JSONResponse
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response, lastErr = r.joinRoomUsingServer(roomID, server)
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if lastErr != nil {
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// There was a problem talking to one of the servers.
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util.GetLogger(r.req.Context()).WithError(lastErr).WithField("server", server).Warn("Failed to join room using server")
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// Try the next server.
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continue
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}
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return *response
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}
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// Every server we tried to join through resulted in an error.
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// We return the error from the last server.
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// TODO: Generate the correct HTTP status code for all different
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// kinds of errors that could have happened.
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// The possible errors include:
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// 1) We can't connect to the remote servers.
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// 2) None of the servers we could connect to think we are allowed
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// to join the room.
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// 3) The remote server returned something invalid.
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// 4) We couldn't fetch the public keys needed to verify the
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// signatures on the state events.
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// 5) ...
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return httputil.LogThenError(r.req, lastErr)
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}
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// joinRoomUsingServer tries to join a remote room using a given matrix server.
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// If there was a failure communicating with the server or the response from the
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// server was invalid this returns an error.
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// Otherwise this returns a JSONResponse.
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func (r joinRoomReq) joinRoomUsingServer(roomID string, server gomatrixserverlib.ServerName) (*util.JSONResponse, error) {
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respMakeJoin, err := r.federation.MakeJoin(r.req.Context(), server, roomID, r.userID)
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if err != nil {
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// TODO: Check if the user was not allowed to join the room.
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return nil, err
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}
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// Set all the fields to be what they should be, this should be a no-op
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// but it's possible that the remote server returned us something "odd"
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err = r.writeToBuilder(&respMakeJoin.JoinEvent, roomID)
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if err != nil {
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return nil, err
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}
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eventID := fmt.Sprintf("$%s:%s", util.RandomString(16), r.cfg.Matrix.ServerName)
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event, err := respMakeJoin.JoinEvent.Build(
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eventID, r.evTime, r.cfg.Matrix.ServerName, r.cfg.Matrix.KeyID, r.cfg.Matrix.PrivateKey,
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)
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if err != nil {
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res := httputil.LogThenError(r.req, err)
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return &res, nil
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}
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respSendJoin, err := r.federation.SendJoin(r.req.Context(), server, event)
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if err != nil {
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return nil, err
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}
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if err = respSendJoin.Check(r.req.Context(), r.keyRing, event); err != nil {
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return nil, err
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}
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if err = r.producer.SendEventWithState(
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r.req.Context(), gomatrixserverlib.RespState(respSendJoin), event,
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); err != nil {
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res := httputil.LogThenError(r.req, err)
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return &res, nil
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}
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return &util.JSONResponse{
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Code: http.StatusOK,
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// TODO: Put the response struct somewhere common.
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JSON: struct {
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RoomID string `json:"room_id"`
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}{roomID},
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}, nil
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}
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