dendrite/federationapi/routing/threepid.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 (
"context"
"encoding/json"
"errors"
"fmt"
"net/http"
"time"
appserviceAPI "github.com/matrix-org/dendrite/appservice/api"
"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/config"
roomserverAPI "github.com/matrix-org/dendrite/roomserver/api"
"github.com/matrix-org/gomatrixserverlib"
"github.com/matrix-org/util"
"github.com/sirupsen/logrus"
)
type invite struct {
MXID string `json:"mxid"`
RoomID string `json:"room_id"`
Sender string `json:"sender"`
Token string `json:"token"`
Signed gomatrixserverlib.MemberThirdPartyInviteSigned `json:"signed"`
}
type invites struct {
Medium string `json:"medium"`
Address string `json:"address"`
MXID string `json:"mxid"`
Invites []invite `json:"invites"`
}
var (
errNotLocalUser = errors.New("the user is not from this server")
errNotInRoom = errors.New("the server isn't currently in the room")
)
// CreateInvitesFrom3PIDInvites implements POST /_matrix/federation/v1/3pid/onbind
func CreateInvitesFrom3PIDInvites(
req *http.Request, queryAPI roomserverAPI.RoomserverQueryAPI,
asAPI appserviceAPI.AppServiceQueryAPI, cfg *config.Dendrite,
producer *producers.RoomserverProducer, federation *gomatrixserverlib.FederationClient,
accountDB *accounts.Database,
) util.JSONResponse {
var body invites
if reqErr := httputil.UnmarshalJSONRequest(req, &body); reqErr != nil {
return *reqErr
}
evs := []gomatrixserverlib.Event{}
for _, inv := range body.Invites {
event, err := createInviteFrom3PIDInvite(
req.Context(), queryAPI, asAPI, cfg, inv, federation, accountDB,
)
if err != nil {
return httputil.LogThenError(req, err)
}
if event != nil {
evs = append(evs, *event)
}
}
// Send all the events
if _, err := producer.SendEvents(req.Context(), evs, cfg.Matrix.ServerName, nil); err != nil {
return httputil.LogThenError(req, err)
}
return util.JSONResponse{
Code: http.StatusOK,
JSON: struct{}{},
}
}
// ExchangeThirdPartyInvite implements PUT /_matrix/federation/v1/exchange_third_party_invite/{roomID}
func ExchangeThirdPartyInvite(
httpReq *http.Request,
request *gomatrixserverlib.FederationRequest,
roomID string,
queryAPI roomserverAPI.RoomserverQueryAPI,
cfg *config.Dendrite,
federation *gomatrixserverlib.FederationClient,
producer *producers.RoomserverProducer,
) util.JSONResponse {
var builder gomatrixserverlib.EventBuilder
if err := json.Unmarshal(request.Content(), &builder); err != nil {
return util.JSONResponse{
Code: http.StatusBadRequest,
JSON: jsonerror.NotJSON("The request body could not be decoded into valid JSON. " + err.Error()),
}
}
// Check that the room ID is correct.
if builder.RoomID != roomID {
return util.JSONResponse{
Code: http.StatusBadRequest,
JSON: jsonerror.BadJSON("The room ID in the request path must match the room ID in the invite event JSON"),
}
}
// Check that the state key is correct.
_, targetDomain, err := gomatrixserverlib.SplitID('@', *builder.StateKey)
if err != nil {
return util.JSONResponse{
Code: http.StatusBadRequest,
JSON: jsonerror.BadJSON("The event's state key isn't a Matrix user ID"),
}
}
// Check that the target user is from the requesting homeserver.
if targetDomain != request.Origin() {
return util.JSONResponse{
Code: http.StatusBadRequest,
JSON: jsonerror.BadJSON("The event's state key doesn't have the same domain as the request's origin"),
}
}
// Auth and build the event from what the remote server sent us
event, err := buildMembershipEvent(httpReq.Context(), &builder, queryAPI, cfg)
if err == errNotInRoom {
return util.JSONResponse{
Code: http.StatusNotFound,
JSON: jsonerror.NotFound("Unknown room " + roomID),
}
} else if err != nil {
return httputil.LogThenError(httpReq, err)
}
// Ask the requesting server to sign the newly created event so we know it
// acknowledged it
signedEvent, err := federation.SendInvite(httpReq.Context(), request.Origin(), *event)
if err != nil {
return httputil.LogThenError(httpReq, err)
}
// Send the event to the roomserver
if _, err = producer.SendEvents(
httpReq.Context(), []gomatrixserverlib.Event{signedEvent.Event}, cfg.Matrix.ServerName, nil,
); err != nil {
return httputil.LogThenError(httpReq, err)
}
return util.JSONResponse{
Code: http.StatusOK,
JSON: struct{}{},
}
}
// createInviteFrom3PIDInvite processes an invite provided by the identity server
// and creates a m.room.member event (with "invite" membership) from it.
// Returns an error if there was a problem building the event or fetching the
// necessary data to do so.
func createInviteFrom3PIDInvite(
ctx context.Context, queryAPI roomserverAPI.RoomserverQueryAPI,
asAPI appserviceAPI.AppServiceQueryAPI, cfg *config.Dendrite,
inv invite, federation *gomatrixserverlib.FederationClient,
accountDB *accounts.Database,
) (*gomatrixserverlib.Event, error) {
_, server, err := gomatrixserverlib.SplitID('@', inv.MXID)
if err != nil {
return nil, err
}
if server != cfg.Matrix.ServerName {
return nil, errNotLocalUser
}
// Build the event
builder := &gomatrixserverlib.EventBuilder{
Type: "m.room.member",
Sender: inv.Sender,
RoomID: inv.RoomID,
StateKey: &inv.MXID,
}
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profile, err := appserviceAPI.RetrieveUserProfile(ctx, inv.MXID, asAPI, accountDB)
if err != nil {
return nil, err
}
content := gomatrixserverlib.MemberContent{
AvatarURL: profile.AvatarURL,
DisplayName: profile.DisplayName,
Membership: gomatrixserverlib.Invite,
ThirdPartyInvite: &gomatrixserverlib.MemberThirdPartyInvite{
Signed: inv.Signed,
},
}
if err = builder.SetContent(content); err != nil {
return nil, err
}
event, err := buildMembershipEvent(ctx, builder, queryAPI, cfg)
if err == errNotInRoom {
return nil, sendToRemoteServer(ctx, inv, federation, cfg, *builder)
}
if err != nil {
return nil, err
}
return event, nil
}
// buildMembershipEvent uses a builder for a m.room.member invite event derived
// from a third-party invite to auth and build the said event. Returns the said
// event.
// Returns errNotInRoom if the server is not in the room the invite is for.
// Returns an error if something failed during the process.
func buildMembershipEvent(
ctx context.Context,
builder *gomatrixserverlib.EventBuilder, queryAPI roomserverAPI.RoomserverQueryAPI,
cfg *config.Dendrite,
) (*gomatrixserverlib.Event, error) {
eventsNeeded, err := gomatrixserverlib.StateNeededForEventBuilder(builder)
if err != nil {
return nil, err
}
// Ask the roomserver for information about this room
queryReq := roomserverAPI.QueryLatestEventsAndStateRequest{
RoomID: builder.RoomID,
StateToFetch: eventsNeeded.Tuples(),
}
var queryRes roomserverAPI.QueryLatestEventsAndStateResponse
if err = queryAPI.QueryLatestEventsAndState(ctx, &queryReq, &queryRes); err != nil {
return nil, err
}
if !queryRes.RoomExists {
// Use federation to auth the event
return nil, errNotInRoom
}
// Auth the event locally
builder.Depth = queryRes.Depth
builder.PrevEvents = queryRes.LatestEvents
authEvents := gomatrixserverlib.NewAuthEvents(nil)
for i := range queryRes.StateEvents {
err = authEvents.AddEvent(&queryRes.StateEvents[i])
if err != nil {
return nil, err
}
}
if err = fillDisplayName(builder, authEvents); err != nil {
return nil, err
}
refs, err := eventsNeeded.AuthEventReferences(&authEvents)
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, time.Now(), cfg.Matrix.ServerName, cfg.Matrix.KeyID, cfg.Matrix.PrivateKey,
)
return &event, err
}
// sendToRemoteServer uses federation to send an invite provided by an identity
// server to a remote server in case the current server isn't in the room the
// invite is for.
// Returns an error if it couldn't get the server names to reach or if all of
// them responded with an error.
func sendToRemoteServer(
ctx context.Context, inv invite,
federation *gomatrixserverlib.FederationClient, _ *config.Dendrite,
builder gomatrixserverlib.EventBuilder,
) (err error) {
remoteServers := make([]gomatrixserverlib.ServerName, 2)
_, remoteServers[0], err = gomatrixserverlib.SplitID('@', inv.Sender)
if err != nil {
return
}
// Fallback to the room's server if the sender's domain is the same as
// the current server's
_, remoteServers[1], err = gomatrixserverlib.SplitID('!', inv.RoomID)
if err != nil {
return
}
for _, server := range remoteServers {
err = federation.ExchangeThirdPartyInvite(ctx, server, builder)
if err == nil {
return
}
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logrus.WithError(err).Warnf("failed to send 3PID invite via %s", server)
}
return errors.New("failed to send 3PID invite via any server")
}
// fillDisplayName looks in a list of auth events for a m.room.third_party_invite
// event with the state key matching a given m.room.member event's content's token.
// If such an event is found, fills the "display_name" attribute of the
// "third_party_invite" structure in the m.room.member event with the display_name
// from the m.room.third_party_invite event.
// Returns an error if there was a problem parsing the m.room.third_party_invite
// event's content or updating the m.room.member event's content.
// Returns nil if no m.room.third_party_invite with a matching token could be
// found. Returning an error isn't necessary in this case as the event will be
// rejected by gomatrixserverlib.
func fillDisplayName(
builder *gomatrixserverlib.EventBuilder, authEvents gomatrixserverlib.AuthEvents,
) error {
var content gomatrixserverlib.MemberContent
if err := json.Unmarshal(builder.Content, &content); err != nil {
return err
}
// Look for the m.room.third_party_invite event
thirdPartyInviteEvent, _ := authEvents.ThirdPartyInvite(content.ThirdPartyInvite.Signed.Token)
if thirdPartyInviteEvent == nil {
// If the third party invite event doesn't exist then we can't use it to set the display name.
return nil
}
var thirdPartyInviteContent gomatrixserverlib.ThirdPartyInviteContent
if err := json.Unmarshal(thirdPartyInviteEvent.Content(), &thirdPartyInviteContent); err != nil {
return err
}
// Use the m.room.third_party_invite event to fill the "displayname" and
// update the m.room.member event's content with it
content.ThirdPartyInvite.DisplayName = thirdPartyInviteContent.DisplayName
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return builder.SetContent(content)
}