130 lines
4.0 KiB
Go
130 lines
4.0 KiB
Go
// Copyright 2024 New Vector Ltd.
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// Copyright 2022 The Matrix.org Foundation C.I.C.
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//
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// SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
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// Please see LICENSE files in the repository root for full details.
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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/util"
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"github.com/sirupsen/logrus"
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"github.com/element-hq/dendrite/roomserver/api"
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"github.com/element-hq/dendrite/setup/config"
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"github.com/element-hq/dendrite/syncapi/internal"
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"github.com/element-hq/dendrite/syncapi/storage"
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"github.com/element-hq/dendrite/syncapi/synctypes"
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userapi "github.com/element-hq/dendrite/userapi/api"
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"github.com/matrix-org/gomatrixserverlib/spec"
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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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rawRoomID 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.NewDatabaseSnapshot(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": rawRoomID,
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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 util.JSONResponse{
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Code: http.StatusInternalServerError,
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JSON: spec.InternalServerError{},
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}
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}
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defer db.Rollback() // nolint: errcheck
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roomID, err := spec.NewRoomID(rawRoomID)
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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: spec.InvalidParam("invalid room ID"),
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}
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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 util.JSONResponse{
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Code: http.StatusInternalServerError,
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JSON: spec.InternalServerError{},
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}
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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: spec.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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rawUserID := device.UserID
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if asUserID := req.FormValue("user_id"); device.AppserviceID != "" && asUserID != "" {
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rawUserID = asUserID
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}
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userID, err := spec.NewUserID(rawUserID, true)
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if err != nil {
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util.GetLogger(req.Context()).WithError(err).Error("invalid device.UserID")
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return util.JSONResponse{
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Code: http.StatusInternalServerError,
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JSON: spec.Unknown("internal server error"),
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}
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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: spec.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: spec.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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clientEvent, err := synctypes.ToClientEvent(events[0], synctypes.FormatAll, func(roomID spec.RoomID, senderID spec.SenderID) (*spec.UserID, error) {
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return rsAPI.QueryUserIDForSender(ctx, roomID, senderID)
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})
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if err != nil {
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util.GetLogger(req.Context()).WithError(err).WithField("senderID", events[0].SenderID()).WithField("roomID", *roomID).Error("Failed converting to ClientEvent")
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return util.JSONResponse{
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Code: http.StatusInternalServerError,
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JSON: spec.Unknown("internal server error"),
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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: *clientEvent,
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}
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}
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