mirror of
https://github.com/matrix-org/dendrite
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0f09e9d196
This allows us to apply history visibility without having to recalculate it in the roomserver. Unblocks https://github.com/matrix-org/complement/pull/495, fix missing part of https://github.com/matrix-org/dendrite/issues/617
102 lines
3.4 KiB
Go
102 lines
3.4 KiB
Go
// Copyright 2022 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 routing
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import (
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"net/http"
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"github.com/matrix-org/gomatrixserverlib"
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"github.com/matrix-org/util"
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"github.com/sirupsen/logrus"
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"github.com/matrix-org/dendrite/clientapi/jsonerror"
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"github.com/matrix-org/dendrite/roomserver/api"
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"github.com/matrix-org/dendrite/setup/config"
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"github.com/matrix-org/dendrite/syncapi/internal"
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"github.com/matrix-org/dendrite/syncapi/storage"
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userapi "github.com/matrix-org/dendrite/userapi/api"
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)
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// GetEvent implements
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//
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// GET /_matrix/client/r0/rooms/{roomId}/event/{eventId}
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//
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// https://spec.matrix.org/v1.4/client-server-api/#get_matrixclientv3roomsroomideventeventid
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func GetEvent(
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req *http.Request,
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device *userapi.Device,
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roomID string,
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eventID string,
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cfg *config.SyncAPI,
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syncDB storage.Database,
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rsAPI api.SyncRoomserverAPI,
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) util.JSONResponse {
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ctx := req.Context()
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db, err := syncDB.NewDatabaseTransaction(ctx)
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logger := util.GetLogger(ctx).WithFields(logrus.Fields{
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"event_id": eventID,
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"room_id": roomID,
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})
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if err != nil {
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logger.WithError(err).Error("GetEvent: syncDB.NewDatabaseTransaction failed")
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return jsonerror.InternalServerError()
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}
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events, err := db.Events(ctx, []string{eventID})
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if err != nil {
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logger.WithError(err).Error("GetEvent: syncDB.Events failed")
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return jsonerror.InternalServerError()
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}
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// The requested event does not exist in our database
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if len(events) == 0 {
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logger.Debugf("GetEvent: requested event doesn't exist locally")
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return util.JSONResponse{
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Code: http.StatusNotFound,
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JSON: jsonerror.NotFound("The event was not found or you do not have permission to read this event"),
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}
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}
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// If the request is coming from an appservice, get the user from the request
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userID := device.UserID
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if asUserID := req.FormValue("user_id"); device.AppserviceID != "" && asUserID != "" {
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userID = asUserID
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}
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// Apply history visibility to determine if the user is allowed to view the event
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events, err = internal.ApplyHistoryVisibilityFilter(ctx, db, rsAPI, events, nil, userID, "event")
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if err != nil {
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logger.WithError(err).Error("GetEvent: internal.ApplyHistoryVisibilityFilter failed")
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return util.JSONResponse{
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Code: http.StatusInternalServerError,
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JSON: jsonerror.InternalServerError(),
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}
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}
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// We only ever expect there to be one event
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if len(events) != 1 {
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// 0 events -> not allowed to view event; > 1 events -> something that shouldn't happen
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logger.WithField("event_count", len(events)).Debug("GetEvent: can't return the requested event")
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return util.JSONResponse{
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Code: http.StatusNotFound,
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JSON: jsonerror.NotFound("The event was not found or you do not have permission to read this event"),
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}
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}
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return util.JSONResponse{
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Code: http.StatusOK,
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JSON: gomatrixserverlib.HeaderedToClientEvent(events[0], gomatrixserverlib.FormatAll),
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}
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}
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