dendrite/clientapi/routing/joinroom.go

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// Copyright 2017 Vector Creations Ltd
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package routing
import (
"fmt"
"net/http"
"strings"
"time"
"github.com/matrix-org/dendrite/clientapi/auth/authtypes"
"github.com/matrix-org/dendrite/clientapi/auth/storage/accounts"
"github.com/matrix-org/dendrite/clientapi/httputil"
"github.com/matrix-org/dendrite/clientapi/jsonerror"
"github.com/matrix-org/dendrite/clientapi/producers"
"github.com/matrix-org/dendrite/common"
"github.com/matrix-org/dendrite/common/config"
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roomserverAPI "github.com/matrix-org/dendrite/roomserver/api"
"github.com/matrix-org/gomatrix"
"github.com/matrix-org/gomatrixserverlib"
"github.com/matrix-org/util"
)
// JoinRoomByIDOrAlias implements the "/join/{roomIDOrAlias}" API.
// https://matrix.org/docs/spec/client_server/r0.2.0.html#post-matrix-client-r0-join-roomidoralias
func JoinRoomByIDOrAlias(
req *http.Request,
device *authtypes.Device,
roomIDOrAlias string,
cfg config.Dendrite,
federation *gomatrixserverlib.FederationClient,
producer *producers.RoomserverProducer,
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queryAPI roomserverAPI.RoomserverQueryAPI,
aliasAPI roomserverAPI.RoomserverAliasAPI,
keyRing gomatrixserverlib.KeyRing,
accountDB *accounts.Database,
) util.JSONResponse {
var content map[string]interface{} // must be a JSON object
if resErr := httputil.UnmarshalJSONRequest(req, &content); resErr != nil {
return *resErr
}
evTime, err := httputil.ParseTSParam(req)
if err != nil {
return util.JSONResponse{
Code: http.StatusBadRequest,
JSON: jsonerror.InvalidArgumentValue(err.Error()),
}
}
localpart, _, err := gomatrixserverlib.SplitID('@', device.UserID)
if err != nil {
return httputil.LogThenError(req, err)
}
profile, err := accountDB.GetProfileByLocalpart(req.Context(), localpart)
if err != nil {
return httputil.LogThenError(req, err)
}
content["membership"] = "join"
content["displayname"] = profile.DisplayName
content["avatar_url"] = profile.AvatarURL
r := joinRoomReq{
req, evTime, content, device.UserID, cfg, federation, producer, queryAPI, aliasAPI, keyRing,
}
if strings.HasPrefix(roomIDOrAlias, "!") {
return r.joinRoomByID(roomIDOrAlias)
}
if strings.HasPrefix(roomIDOrAlias, "#") {
return r.joinRoomByAlias(roomIDOrAlias)
}
return util.JSONResponse{
Code: http.StatusBadRequest,
JSON: jsonerror.BadJSON(
fmt.Sprintf("Invalid first character '%s' for room ID or alias",
string([]rune(roomIDOrAlias)[0])), // Wrapping with []rune makes this call UTF-8 safe
),
}
}
type joinRoomReq struct {
req *http.Request
evTime time.Time
content map[string]interface{}
userID string
cfg config.Dendrite
federation *gomatrixserverlib.FederationClient
producer *producers.RoomserverProducer
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queryAPI roomserverAPI.RoomserverQueryAPI
aliasAPI roomserverAPI.RoomserverAliasAPI
keyRing gomatrixserverlib.KeyRing
}
// joinRoomByID joins a room by room ID
func (r joinRoomReq) joinRoomByID(roomID string) util.JSONResponse {
// A client should only join a room by room ID when it has an invite
// to the room. If the server is already in the room then we can
// lookup the invite and process the request as a normal state event.
// If the server is not in the room the we will need to look up the
// remote server the invite came from in order to request a join event
// from that server.
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queryReq := roomserverAPI.QueryInvitesForUserRequest{
RoomID: roomID, TargetUserID: r.userID,
}
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var queryRes roomserverAPI.QueryInvitesForUserResponse
if err := r.queryAPI.QueryInvitesForUser(r.req.Context(), &queryReq, &queryRes); err != nil {
return httputil.LogThenError(r.req, err)
}
servers := []gomatrixserverlib.ServerName{}
seenInInviterIDs := map[gomatrixserverlib.ServerName]bool{}
for _, userID := range queryRes.InviteSenderUserIDs {
_, domain, err := gomatrixserverlib.SplitID('@', userID)
if err != nil {
return httputil.LogThenError(r.req, err)
}
if !seenInInviterIDs[domain] {
servers = append(servers, domain)
seenInInviterIDs[domain] = true
}
}
// Also add the domain extracted from the roomID as a last resort to join
// in case the client is erroneously trying to join by ID without an invite
// or all previous attempts at domains extracted from the inviter IDs fail
// Note: It's no guarantee we'll succeed because a room isn't bound to the domain in its ID
_, domain, err := gomatrixserverlib.SplitID('!', roomID)
if err != nil {
return httputil.LogThenError(r.req, err)
}
if domain != r.cfg.Matrix.ServerName && !seenInInviterIDs[domain] {
servers = append(servers, domain)
}
return r.joinRoomUsingServers(roomID, servers)
}
// joinRoomByAlias joins a room using a room alias.
func (r joinRoomReq) joinRoomByAlias(roomAlias string) util.JSONResponse {
_, domain, err := gomatrixserverlib.SplitID('#', roomAlias)
if err != nil {
return util.JSONResponse{
Code: http.StatusBadRequest,
JSON: jsonerror.BadJSON("Room alias must be in the form '#localpart:domain'"),
}
}
if domain == r.cfg.Matrix.ServerName {
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queryReq := roomserverAPI.GetRoomIDForAliasRequest{Alias: roomAlias}
var queryRes roomserverAPI.GetRoomIDForAliasResponse
if err = r.aliasAPI.GetRoomIDForAlias(r.req.Context(), &queryReq, &queryRes); err != nil {
return httputil.LogThenError(r.req, err)
}
if len(queryRes.RoomID) > 0 {
return r.joinRoomUsingServers(queryRes.RoomID, []gomatrixserverlib.ServerName{r.cfg.Matrix.ServerName})
}
// If the response doesn't contain a non-empty string, return an error
return util.JSONResponse{
Code: http.StatusNotFound,
JSON: jsonerror.NotFound("Room alias " + roomAlias + " not found."),
}
}
// If the room isn't local, use federation to join
return r.joinRoomByRemoteAlias(domain, roomAlias)
}
func (r joinRoomReq) joinRoomByRemoteAlias(
domain gomatrixserverlib.ServerName, roomAlias string,
) util.JSONResponse {
resp, err := r.federation.LookupRoomAlias(r.req.Context(), domain, roomAlias)
if err != nil {
switch x := err.(type) {
case gomatrix.HTTPError:
if x.Code == http.StatusNotFound {
return util.JSONResponse{
Code: http.StatusNotFound,
JSON: jsonerror.NotFound("Room alias not found"),
}
}
}
return httputil.LogThenError(r.req, err)
}
return r.joinRoomUsingServers(resp.RoomID, resp.Servers)
}
func (r joinRoomReq) writeToBuilder(eb *gomatrixserverlib.EventBuilder, roomID string) error {
eb.Type = "m.room.member"
err := eb.SetContent(r.content)
if err != nil {
return err
}
err = eb.SetUnsigned(struct{}{})
if err != nil {
return err
}
eb.Sender = r.userID
eb.StateKey = &r.userID
eb.RoomID = roomID
eb.Redacts = ""
return nil
}
func (r joinRoomReq) joinRoomUsingServers(
roomID string, servers []gomatrixserverlib.ServerName,
) util.JSONResponse {
var eb gomatrixserverlib.EventBuilder
err := r.writeToBuilder(&eb, roomID)
if err != nil {
return httputil.LogThenError(r.req, err)
}
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var queryRes roomserverAPI.QueryLatestEventsAndStateResponse
event, err := common.BuildEvent(r.req.Context(), &eb, r.cfg, r.evTime, r.queryAPI, &queryRes)
if err == nil {
if _, err = r.producer.SendEvents(r.req.Context(), []gomatrixserverlib.Event{*event}, r.cfg.Matrix.ServerName, nil); err != nil {
return httputil.LogThenError(r.req, err)
}
return util.JSONResponse{
Code: http.StatusOK,
JSON: struct {
RoomID string `json:"room_id"`
}{roomID},
}
}
if err != common.ErrRoomNoExists {
return httputil.LogThenError(r.req, err)
}
if len(servers) == 0 {
return util.JSONResponse{
Code: http.StatusNotFound,
JSON: jsonerror.NotFound("No candidate servers found for room"),
}
}
var lastErr error
for _, server := range servers {
var response *util.JSONResponse
response, lastErr = r.joinRoomUsingServer(roomID, server)
if lastErr != nil {
// There was a problem talking to one of the servers.
util.GetLogger(r.req.Context()).WithError(lastErr).WithField("server", server).Warn("Failed to join room using server")
// Try the next server.
continue
}
return *response
}
// Every server we tried to join through resulted in an error.
// We return the error from the last server.
// TODO: Generate the correct HTTP status code for all different
// kinds of errors that could have happened.
// The possible errors include:
// 1) We can't connect to the remote servers.
// 2) None of the servers we could connect to think we are allowed
// to join the room.
// 3) The remote server returned something invalid.
// 4) We couldn't fetch the public keys needed to verify the
// signatures on the state events.
// 5) ...
return httputil.LogThenError(r.req, lastErr)
}
// joinRoomUsingServer tries to join a remote room using a given matrix server.
// If there was a failure communicating with the server or the response from the
// server was invalid this returns an error.
// Otherwise this returns a JSONResponse.
func (r joinRoomReq) joinRoomUsingServer(roomID string, server gomatrixserverlib.ServerName) (*util.JSONResponse, error) {
respMakeJoin, err := r.federation.MakeJoin(r.req.Context(), server, roomID, r.userID)
if err != nil {
// TODO: Check if the user was not allowed to join the room.
return nil, err
}
// Set all the fields to be what they should be, this should be a no-op
// but it's possible that the remote server returned us something "odd"
err = r.writeToBuilder(&respMakeJoin.JoinEvent, roomID)
if err != nil {
return nil, err
}
eventID := fmt.Sprintf("$%s:%s", util.RandomString(16), r.cfg.Matrix.ServerName)
event, err := respMakeJoin.JoinEvent.Build(
eventID, r.evTime, r.cfg.Matrix.ServerName, r.cfg.Matrix.KeyID, r.cfg.Matrix.PrivateKey,
)
if err != nil {
res := httputil.LogThenError(r.req, err)
return &res, nil
}
respSendJoin, err := r.federation.SendJoin(r.req.Context(), server, event)
if err != nil {
return nil, err
}
if err = respSendJoin.Check(r.req.Context(), r.keyRing, event); err != nil {
return nil, err
}
if err = r.producer.SendEventWithState(
r.req.Context(), gomatrixserverlib.RespState(respSendJoin), event,
); err != nil {
res := httputil.LogThenError(r.req, err)
return &res, nil
}
return &util.JSONResponse{
Code: http.StatusOK,
// TODO: Put the response struct somewhere common.
JSON: struct {
RoomID string `json:"room_id"`
}{roomID},
}, nil
}