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dendrite/clientapi/routing/createroom.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 (
"encoding/json"
"fmt"
"net/http"
"strings"
"time"
appserviceAPI "github.com/matrix-org/dendrite/appservice/api"
roomserverAPI "github.com/matrix-org/dendrite/roomserver/api"
"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"
"github.com/matrix-org/gomatrixserverlib"
"github.com/matrix-org/util"
log "github.com/sirupsen/logrus"
)
// https://matrix.org/docs/spec/client_server/r0.2.0.html#post-matrix-client-r0-createroom
type createRoomRequest struct {
Invite []string `json:"invite"`
Name string `json:"name"`
Visibility string `json:"visibility"`
Topic string `json:"topic"`
Preset string `json:"preset"`
CreationContent map[string]interface{} `json:"creation_content"`
InitialState []fledglingEvent `json:"initial_state"`
RoomAliasName string `json:"room_alias_name"`
GuestCanJoin bool `json:"guest_can_join"`
}
const (
presetPrivateChat = "private_chat"
presetTrustedPrivateChat = "trusted_private_chat"
presetPublicChat = "public_chat"
)
const (
historyVisibilityShared = "shared"
// TODO: These should be implemented once history visibility is implemented
// historyVisibilityWorldReadable = "world_readable"
// historyVisibilityInvited = "invited"
)
func (r createRoomRequest) Validate() *util.JSONResponse {
whitespace := "\t\n\x0b\x0c\r " // https://docs.python.org/2/library/string.html#string.whitespace
// https://github.com/matrix-org/synapse/blob/v0.19.2/synapse/handlers/room.py#L81
// Synapse doesn't check for ':' but we will else it will break parsers badly which split things into 2 segments.
if strings.ContainsAny(r.RoomAliasName, whitespace+":") {
return &util.JSONResponse{
Code: http.StatusBadRequest,
JSON: jsonerror.BadJSON("room_alias_name cannot contain whitespace or ':'"),
}
}
for _, userID := range r.Invite {
// TODO: We should put user ID parsing code into gomatrixserverlib and use that instead
// (see https://github.com/matrix-org/gomatrixserverlib/blob/3394e7c7003312043208aa73727d2256eea3d1f6/eventcontent.go#L347 )
// It should be a struct (with pointers into a single string to avoid copying) and
// we should update all refs to use UserID types rather than strings.
// https://github.com/matrix-org/synapse/blob/v0.19.2/synapse/types.py#L92
if _, _, err := gomatrixserverlib.SplitID('@', userID); err != nil {
return &util.JSONResponse{
Code: http.StatusBadRequest,
JSON: jsonerror.BadJSON("user id must be in the form @localpart:domain"),
}
}
}
switch r.Preset {
case presetPrivateChat, presetTrustedPrivateChat, presetPublicChat, "":
default:
return &util.JSONResponse{
Code: http.StatusBadRequest,
JSON: jsonerror.BadJSON("preset must be any of 'private_chat', 'trusted_private_chat', 'public_chat'"),
}
}
// Validate creation_content fields defined in the spec by marshalling the
// creation_content map into bytes and then unmarshalling the bytes into
// common.CreateContent.
creationContentBytes, err := json.Marshal(r.CreationContent)
if err != nil {
return &util.JSONResponse{
Code: http.StatusBadRequest,
JSON: jsonerror.BadJSON("malformed creation_content"),
}
}
var CreationContent gomatrixserverlib.CreateContent
err = json.Unmarshal(creationContentBytes, &CreationContent)
if err != nil {
return &util.JSONResponse{
Code: http.StatusBadRequest,
JSON: jsonerror.BadJSON("malformed creation_content"),
}
}
return nil
}
// https://matrix.org/docs/spec/client_server/r0.2.0.html#post-matrix-client-r0-createroom
type createRoomResponse struct {
RoomID string `json:"room_id"`
RoomAlias string `json:"room_alias,omitempty"` // in synapse not spec
}
// fledglingEvent is a helper representation of an event used when creating many events in succession.
type fledglingEvent struct {
Type string `json:"type"`
StateKey string `json:"state_key"`
Content interface{} `json:"content"`
}
// CreateRoom implements /createRoom
func CreateRoom(
req *http.Request, device *authtypes.Device,
cfg config.Dendrite, producer *producers.RoomserverProducer,
accountDB *accounts.Database, aliasAPI roomserverAPI.RoomserverAliasAPI,
asAPI appserviceAPI.AppServiceQueryAPI,
) util.JSONResponse {
// TODO (#267): Check room ID doesn't clash with an existing one, and we
// probably shouldn't be using pseudo-random strings, maybe GUIDs?
roomID := fmt.Sprintf("!%s:%s", util.RandomString(16), cfg.Matrix.ServerName)
return createRoom(req, device, cfg, roomID, producer, accountDB, aliasAPI, asAPI)
}
// createRoom implements /createRoom
// nolint: gocyclo
func createRoom(
req *http.Request, device *authtypes.Device,
cfg config.Dendrite, roomID string, producer *producers.RoomserverProducer,
accountDB *accounts.Database, aliasAPI roomserverAPI.RoomserverAliasAPI,
asAPI appserviceAPI.AppServiceQueryAPI,
) util.JSONResponse {
logger := util.GetLogger(req.Context())
userID := device.UserID
var r createRoomRequest
resErr := httputil.UnmarshalJSONRequest(req, &r)
if resErr != nil {
return *resErr
}
// TODO: apply rate-limit
if resErr = r.Validate(); resErr != nil {
return *resErr
}
evTime, err := httputil.ParseTSParam(req)
if err != nil {
return util.JSONResponse{
Code: http.StatusBadRequest,
JSON: jsonerror.InvalidArgumentValue(err.Error()),
}
}
// Clobber keys: creator, room_version
if r.CreationContent == nil {
r.CreationContent = make(map[string]interface{}, 2)
}
r.CreationContent["creator"] = userID
r.CreationContent["room_version"] = "1" // TODO: We set this to 1 before we support Room versioning
// TODO: visibility/presets/raw initial state
// TODO: Create room alias association
// Make sure this doesn't fall into an application service's namespace though!
logger.WithFields(log.Fields{
"userID": userID,
"roomID": roomID,
}).Info("Creating new room")
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profile, err := appserviceAPI.RetrieveUserProfile(req.Context(), userID, asAPI, accountDB)
if err != nil {
return httputil.LogThenError(req, err)
}
membershipContent := gomatrixserverlib.MemberContent{
Membership: gomatrixserverlib.Join,
DisplayName: profile.DisplayName,
AvatarURL: profile.AvatarURL,
}
var joinRules, historyVisibility string
switch r.Preset {
case presetPrivateChat:
joinRules = gomatrixserverlib.Invite
historyVisibility = historyVisibilityShared
case presetTrustedPrivateChat:
joinRules = gomatrixserverlib.Invite
historyVisibility = historyVisibilityShared
// TODO If trusted_private_chat, all invitees are given the same power level as the room creator.
case presetPublicChat:
joinRules = gomatrixserverlib.Public
historyVisibility = historyVisibilityShared
default:
// Default room rules, r.Preset was previously checked for valid values so
// only a request with no preset should end up here.
joinRules = gomatrixserverlib.Invite
historyVisibility = historyVisibilityShared
}
var builtEvents []gomatrixserverlib.Event
// send events into the room in order of:
// 1- m.room.create
// 2- room creator join member
// 3- m.room.power_levels
// 4- m.room.canonical_alias (opt) TODO
// 5- m.room.join_rules
// 6- m.room.history_visibility
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// 7- m.room.guest_access (opt)
// 8- other initial state items
// 9- m.room.name (opt)
// 10- m.room.topic (opt)
// 11- invite events (opt) - with is_direct flag if applicable TODO
// 12- 3pid invite events (opt) TODO
// 13- m.room.aliases event for HS (if alias specified) TODO
// This differs from Synapse slightly. Synapse would vary the ordering of 3-7
// depending on if those events were in "initial_state" or not. This made it
// harder to reason about, hence sticking to a strict static ordering.
// TODO: Synapse has txn/token ID on each event. Do we need to do this here?
eventsToMake := []fledglingEvent{
{"m.room.create", "", r.CreationContent},
{"m.room.member", userID, membershipContent},
{"m.room.power_levels", "", common.InitialPowerLevelsContent(userID)},
// TODO: m.room.canonical_alias
{"m.room.join_rules", "", gomatrixserverlib.JoinRuleContent{JoinRule: joinRules}},
{"m.room.history_visibility", "", common.HistoryVisibilityContent{HistoryVisibility: historyVisibility}},
}
if r.GuestCanJoin {
eventsToMake = append(eventsToMake, fledglingEvent{"m.room.guest_access", "", common.GuestAccessContent{GuestAccess: "can_join"}})
}
eventsToMake = append(eventsToMake, r.InitialState...)
if r.Name != "" {
eventsToMake = append(eventsToMake, fledglingEvent{"m.room.name", "", common.NameContent{Name: r.Name}})
}
if r.Topic != "" {
eventsToMake = append(eventsToMake, fledglingEvent{"m.room.topic", "", common.TopicContent{Topic: r.Topic}})
}
// TODO: invite events
// TODO: 3pid invite events
// TODO: m.room.aliases
authEvents := gomatrixserverlib.NewAuthEvents(nil)
for i, e := range eventsToMake {
depth := i + 1 // depth starts at 1
builder := gomatrixserverlib.EventBuilder{
Sender: userID,
RoomID: roomID,
Type: e.Type,
StateKey: &e.StateKey,
Depth: int64(depth),
}
err = builder.SetContent(e.Content)
if err != nil {
return httputil.LogThenError(req, err)
}
if i > 0 {
builder.PrevEvents = []gomatrixserverlib.EventReference{builtEvents[i-1].EventReference()}
}
var ev *gomatrixserverlib.Event
ev, err = buildEvent(&builder, &authEvents, cfg, evTime)
if err != nil {
return httputil.LogThenError(req, err)
}
if err = gomatrixserverlib.Allowed(*ev, &authEvents); err != nil {
return httputil.LogThenError(req, err)
}
// Add the event to the list of auth events
builtEvents = append(builtEvents, *ev)
err = authEvents.AddEvent(ev)
if err != nil {
return httputil.LogThenError(req, err)
}
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}
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// send events to the room server
_, err = producer.SendEvents(req.Context(), builtEvents, cfg.Matrix.ServerName, nil)
if err != nil {
return httputil.LogThenError(req, err)
}
// TODO(#269): Reserve room alias while we create the room. This stops us
// from creating the room but still failing due to the alias having already
// been taken.
var roomAlias string
if r.RoomAliasName != "" {
roomAlias = fmt.Sprintf("#%s:%s", r.RoomAliasName, cfg.Matrix.ServerName)
aliasReq := roomserverAPI.SetRoomAliasRequest{
Alias: roomAlias,
RoomID: roomID,
UserID: userID,
}
var aliasResp roomserverAPI.SetRoomAliasResponse
err = aliasAPI.SetRoomAlias(req.Context(), &aliasReq, &aliasResp)
if err != nil {
return httputil.LogThenError(req, err)
}
if aliasResp.AliasExists {
return util.MessageResponse(400, "Alias already exists")
}
}
response := createRoomResponse{
RoomID: roomID,
RoomAlias: roomAlias,
}
return util.JSONResponse{
Code: 200,
JSON: response,
}
}
// buildEvent fills out auth_events for the builder then builds the event
func buildEvent(
builder *gomatrixserverlib.EventBuilder,
provider gomatrixserverlib.AuthEventProvider,
cfg config.Dendrite,
evTime time.Time,
) (*gomatrixserverlib.Event, error) {
eventsNeeded, err := gomatrixserverlib.StateNeededForEventBuilder(builder)
if err != nil {
return nil, err
}
refs, err := eventsNeeded.AuthEventReferences(provider)
if err != nil {
return nil, err
}
builder.AuthEvents = refs
eventID := fmt.Sprintf("$%s:%s", util.RandomString(16), cfg.Matrix.ServerName)
event, err := builder.Build(eventID, evTime, cfg.Matrix.ServerName, cfg.Matrix.KeyID, cfg.Matrix.PrivateKey)
if err != nil {
return nil, fmt.Errorf("cannot build event %s : Builder failed to build. %s", builder.Type, err)
}
return &event, nil
}