mirror of
https://github.com/element-hq/element-web
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683 lines
23 KiB
TypeScript
683 lines
23 KiB
TypeScript
/*
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Copyright 2019 - 2021 The Matrix.org Foundation C.I.C.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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import {
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IResultRoomEvents,
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ISearchRequestBody,
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ISearchResponse,
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ISearchResult,
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ISearchResults,
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SearchOrderBy,
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} from "matrix-js-sdk/src/@types/search";
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import { IRoomEventFilter } from "matrix-js-sdk/src/filter";
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import { EventType } from "matrix-js-sdk/src/@types/event";
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import { SearchResult } from "matrix-js-sdk/src/models/search-result";
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import { MatrixClient } from "matrix-js-sdk/src/matrix";
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import { ISearchArgs } from "./indexing/BaseEventIndexManager";
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import EventIndexPeg from "./indexing/EventIndexPeg";
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import { isNotUndefined } from "./Typeguards";
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const SEARCH_LIMIT = 10;
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async function serverSideSearch(
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client: MatrixClient,
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term: string,
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roomId?: string,
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abortSignal?: AbortSignal,
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): Promise<{ response: ISearchResponse; query: ISearchRequestBody }> {
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const filter: IRoomEventFilter = {
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limit: SEARCH_LIMIT,
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};
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if (roomId !== undefined) filter.rooms = [roomId];
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const body: ISearchRequestBody = {
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search_categories: {
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room_events: {
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search_term: term,
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filter: filter,
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order_by: SearchOrderBy.Recent,
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event_context: {
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before_limit: 1,
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after_limit: 1,
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include_profile: true,
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},
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},
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},
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};
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const response = await client.search({ body: body }, abortSignal);
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return { response, query: body };
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}
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async function serverSideSearchProcess(
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client: MatrixClient,
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term: string,
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roomId?: string,
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abortSignal?: AbortSignal,
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): Promise<ISearchResults> {
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const result = await serverSideSearch(client, term, roomId, abortSignal);
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// The js-sdk method backPaginateRoomEventsSearch() uses _query internally
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// so we're reusing the concept here since we want to delegate the
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// pagination back to backPaginateRoomEventsSearch() in some cases.
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const searchResults: ISearchResults = {
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abortSignal,
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_query: result.query,
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results: [],
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highlights: [],
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};
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return client.processRoomEventsSearch(searchResults, result.response);
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}
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function compareEvents(a: ISearchResult, b: ISearchResult): number {
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const aEvent = a.result;
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const bEvent = b.result;
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if (aEvent.origin_server_ts > bEvent.origin_server_ts) return -1;
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if (aEvent.origin_server_ts < bEvent.origin_server_ts) return 1;
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return 0;
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}
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async function combinedSearch(
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client: MatrixClient,
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searchTerm: string,
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abortSignal?: AbortSignal,
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): Promise<ISearchResults> {
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// Create two promises, one for the local search, one for the
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// server-side search.
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const serverSidePromise = serverSideSearch(client, searchTerm, undefined, abortSignal);
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const localPromise = localSearch(searchTerm);
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// Wait for both promises to resolve.
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await Promise.all([serverSidePromise, localPromise]);
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// Get both search results.
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const localResult = await localPromise;
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const serverSideResult = await serverSidePromise;
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const serverQuery = serverSideResult.query;
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const serverResponse = serverSideResult.response;
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const localQuery = localResult.query;
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const localResponse = localResult.response;
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// Store our queries for later on so we can support pagination.
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//
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// We're reusing _query here again to not introduce separate code paths and
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// concepts for our different pagination methods. We're storing the
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// server-side next batch separately since the query is the json body of
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// the request and next_batch needs to be a query parameter.
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//
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// We can't put it in the final result that _processRoomEventsSearch()
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// returns since that one can be either a server-side one, a local one or a
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// fake one to fetch the remaining cached events. See the docs for
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// combineEvents() for an explanation why we need to cache events.
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const emptyResult: ISeshatSearchResults = {
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seshatQuery: localQuery,
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_query: serverQuery,
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serverSideNextBatch: serverResponse.search_categories.room_events.next_batch,
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cachedEvents: [],
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oldestEventFrom: "server",
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results: [],
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highlights: [],
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};
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// Combine our results.
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const combinedResult = combineResponses(emptyResult, localResponse, serverResponse.search_categories.room_events);
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// Let the client process the combined result.
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const response: ISearchResponse = {
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search_categories: {
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room_events: combinedResult,
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},
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};
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const result = client.processRoomEventsSearch(emptyResult, response);
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// Restore our encryption info so we can properly re-verify the events.
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restoreEncryptionInfo(result.results);
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return result;
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}
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async function localSearch(
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searchTerm: string,
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roomId?: string,
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processResult = true,
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): Promise<{ response: IResultRoomEvents; query: ISearchArgs }> {
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const eventIndex = EventIndexPeg.get();
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const searchArgs: ISearchArgs = {
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search_term: searchTerm,
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before_limit: 1,
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after_limit: 1,
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limit: SEARCH_LIMIT,
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order_by_recency: true,
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room_id: undefined,
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};
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if (roomId !== undefined) {
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searchArgs.room_id = roomId;
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}
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const localResult = await eventIndex!.search(searchArgs);
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if (!localResult) {
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throw new Error("Local search failed");
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}
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searchArgs.next_batch = localResult.next_batch;
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const result = {
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response: localResult,
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query: searchArgs,
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};
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return result;
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}
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export interface ISeshatSearchResults extends ISearchResults {
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seshatQuery?: ISearchArgs;
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cachedEvents?: ISearchResult[];
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oldestEventFrom?: "local" | "server";
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serverSideNextBatch?: string;
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}
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async function localSearchProcess(
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client: MatrixClient,
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searchTerm: string,
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roomId?: string,
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): Promise<ISeshatSearchResults> {
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const emptyResult = {
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results: [],
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highlights: [],
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} as ISeshatSearchResults;
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if (searchTerm === "") return emptyResult;
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const result = await localSearch(searchTerm, roomId);
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emptyResult.seshatQuery = result.query;
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const response: ISearchResponse = {
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search_categories: {
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room_events: result.response,
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},
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};
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const processedResult = client.processRoomEventsSearch(emptyResult, response);
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// Restore our encryption info so we can properly re-verify the events.
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restoreEncryptionInfo(processedResult.results);
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return processedResult;
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}
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async function localPagination(
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client: MatrixClient,
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searchResult: ISeshatSearchResults,
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): Promise<ISeshatSearchResults> {
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const eventIndex = EventIndexPeg.get();
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if (!searchResult.seshatQuery) {
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throw new Error("localSearchProcess must be called first");
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}
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const localResult = await eventIndex!.search(searchResult.seshatQuery);
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if (!localResult) {
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throw new Error("Local search pagination failed");
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}
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searchResult.seshatQuery.next_batch = localResult.next_batch;
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// We only need to restore the encryption state for the new results, so
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// remember how many of them we got.
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const newResultCount = localResult.results.length;
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const response = {
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search_categories: {
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room_events: localResult,
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},
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};
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const result = client.processRoomEventsSearch(searchResult, response);
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// Restore our encryption info so we can properly re-verify the events.
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const newSlice = result.results.slice(Math.max(result.results.length - newResultCount, 0));
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restoreEncryptionInfo(newSlice);
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searchResult.pendingRequest = undefined;
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return result;
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}
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function compareOldestEvents(firstResults: ISearchResult[], secondResults: ISearchResult[]): number {
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try {
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const oldestFirstEvent = firstResults[firstResults.length - 1].result;
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const oldestSecondEvent = secondResults[secondResults.length - 1].result;
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if (oldestFirstEvent.origin_server_ts <= oldestSecondEvent.origin_server_ts) {
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return -1;
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} else {
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return 1;
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}
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} catch {
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return 0;
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}
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}
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function combineEventSources(
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previousSearchResult: ISeshatSearchResults,
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response: IResultRoomEvents,
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a: ISearchResult[],
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b: ISearchResult[],
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): void {
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// Merge event sources and sort the events.
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const combinedEvents = a.concat(b).sort(compareEvents);
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// Put half of the events in the response, and cache the other half.
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response.results = combinedEvents.slice(0, SEARCH_LIMIT);
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previousSearchResult.cachedEvents = combinedEvents.slice(SEARCH_LIMIT);
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}
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/**
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* Combine the events from our event sources into a sorted result
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*
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* This method will first be called from the combinedSearch() method. In this
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* case we will fetch SEARCH_LIMIT events from the server and the local index.
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*
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* The method will put the SEARCH_LIMIT newest events from the server and the
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* local index in the results part of the response, the rest will be put in the
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* cachedEvents field of the previousSearchResult (in this case an empty search
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* result).
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*
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* Every subsequent call will be made from the combinedPagination() method, in
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* this case we will combine the cachedEvents and the next SEARCH_LIMIT events
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* from either the server or the local index.
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*
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* Since we have two event sources and we need to sort the results by date we
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* need keep on looking for the oldest event. We are implementing a variation of
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* a sliding window.
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*
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* The event sources are here represented as two sorted lists where the smallest
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* number represents the newest event. The two lists need to be merged in a way
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* that preserves the sorted property so they can be shown as one search result.
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* We first fetch SEARCH_LIMIT events from both sources.
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*
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* If we set SEARCH_LIMIT to 3:
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*
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* Server events [01, 02, 04, 06, 07, 08, 11, 13]
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* |01, 02, 04|
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* Local events [03, 05, 09, 10, 12, 14, 15, 16]
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* |03, 05, 09|
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*
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* We note that the oldest event is from the local index, and we combine the
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* results:
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*
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* Server window [01, 02, 04]
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* Local window [03, 05, 09]
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*
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* Combined events [01, 02, 03, 04, 05, 09]
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*
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* We split the combined result in the part that we want to present and a part
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* that will be cached.
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*
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* Presented events [01, 02, 03]
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* Cached events [04, 05, 09]
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*
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* We slide the window for the server since the oldest event is from the local
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* index.
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*
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* Server events [01, 02, 04, 06, 07, 08, 11, 13]
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* |06, 07, 08|
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* Local events [03, 05, 09, 10, 12, 14, 15, 16]
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* |XX, XX, XX|
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* Cached events [04, 05, 09]
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*
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* We note that the oldest event is from the server and we combine the new
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* server events with the cached ones.
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*
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* Cached events [04, 05, 09]
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* Server events [06, 07, 08]
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*
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* Combined events [04, 05, 06, 07, 08, 09]
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*
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* We split again.
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*
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* Presented events [04, 05, 06]
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* Cached events [07, 08, 09]
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*
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* We slide the local window, the oldest event is on the server.
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*
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* Server events [01, 02, 04, 06, 07, 08, 11, 13]
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* |XX, XX, XX|
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* Local events [03, 05, 09, 10, 12, 14, 15, 16]
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* |10, 12, 14|
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*
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* Cached events [07, 08, 09]
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* Local events [10, 12, 14]
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* Combined events [07, 08, 09, 10, 12, 14]
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*
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* Presented events [07, 08, 09]
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* Cached events [10, 12, 14]
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*
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* Next up we slide the server window again.
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*
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* Server events [01, 02, 04, 06, 07, 08, 11, 13]
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* |11, 13|
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* Local events [03, 05, 09, 10, 12, 14, 15, 16]
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* |XX, XX, XX|
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*
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* Cached events [10, 12, 14]
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* Server events [11, 13]
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* Combined events [10, 11, 12, 13, 14]
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*
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* Presented events [10, 11, 12]
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* Cached events [13, 14]
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*
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* We have one source exhausted, we fetch the rest of our events from the other
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* source and combine it with our cached events.
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*
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*
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* @param {object} previousSearchResult A search result from a previous search
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* call.
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* @param {object} localEvents An unprocessed search result from the event
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* index.
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* @param {object} serverEvents An unprocessed search result from the server.
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*
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* @return {object} A response object that combines the events from the
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* different event sources.
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*
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*/
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function combineEvents(
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previousSearchResult: ISeshatSearchResults,
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localEvents?: IResultRoomEvents,
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serverEvents?: IResultRoomEvents,
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): IResultRoomEvents {
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const response = {} as IResultRoomEvents;
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const cachedEvents = previousSearchResult.cachedEvents ?? [];
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let oldestEventFrom = previousSearchResult.oldestEventFrom;
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response.highlights = previousSearchResult.highlights;
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if (localEvents && serverEvents && serverEvents.results) {
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// This is a first search call, combine the events from the server and
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// the local index. Note where our oldest event came from, we shall
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// fetch the next batch of events from the other source.
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if (compareOldestEvents(localEvents.results, serverEvents.results) < 0) {
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oldestEventFrom = "local";
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}
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combineEventSources(previousSearchResult, response, localEvents.results, serverEvents.results);
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response.highlights = localEvents.highlights.concat(serverEvents.highlights);
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} else if (localEvents) {
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// This is a pagination call fetching more events from the local index,
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// meaning that our oldest event was on the server.
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// Change the source of the oldest event if our local event is older
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// than the cached one.
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if (compareOldestEvents(localEvents.results, cachedEvents) < 0) {
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oldestEventFrom = "local";
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}
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combineEventSources(previousSearchResult, response, localEvents.results, cachedEvents);
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} else if (serverEvents && serverEvents.results) {
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// This is a pagination call fetching more events from the server,
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// meaning that our oldest event was in the local index.
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// Change the source of the oldest event if our server event is older
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// than the cached one.
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if (compareOldestEvents(serverEvents.results, cachedEvents) < 0) {
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oldestEventFrom = "server";
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}
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combineEventSources(previousSearchResult, response, serverEvents.results, cachedEvents);
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} else {
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// This is a pagination call where we exhausted both of our event
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// sources, let's push the remaining cached events.
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response.results = cachedEvents;
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previousSearchResult.cachedEvents = [];
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}
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previousSearchResult.oldestEventFrom = oldestEventFrom;
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return response;
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}
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/**
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* Combine the local and server search responses
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*
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* @param {object} previousSearchResult A search result from a previous search
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* call.
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* @param {object} localEvents An unprocessed search result from the event
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* index.
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* @param {object} serverEvents An unprocessed search result from the server.
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*
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* @return {object} A response object that combines the events from the
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* different event sources.
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*/
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function combineResponses(
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previousSearchResult: ISeshatSearchResults,
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localEvents?: IResultRoomEvents,
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serverEvents?: IResultRoomEvents,
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): IResultRoomEvents {
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// Combine our events first.
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const response = combineEvents(previousSearchResult, localEvents, serverEvents);
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// Our first search will contain counts from both sources, subsequent
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// pagination requests will fetch responses only from one of the sources, so
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// reuse the first count when we're paginating.
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if (previousSearchResult.count) {
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response.count = previousSearchResult.count;
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} else {
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const localEventCount = localEvents?.count ?? 0;
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const serverEventCount = serverEvents?.count ?? 0;
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response.count = localEventCount + serverEventCount;
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}
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// Update our next batch tokens for the given search sources.
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if (localEvents && isNotUndefined(previousSearchResult.seshatQuery)) {
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previousSearchResult.seshatQuery.next_batch = localEvents.next_batch;
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}
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if (serverEvents) {
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previousSearchResult.serverSideNextBatch = serverEvents.next_batch;
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}
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// Set the response next batch token to one of the tokens from the sources,
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// this makes sure that if we exhaust one of the sources we continue with
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// the other one.
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if (previousSearchResult.seshatQuery?.next_batch) {
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response.next_batch = previousSearchResult.seshatQuery.next_batch;
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} else if (previousSearchResult.serverSideNextBatch) {
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response.next_batch = previousSearchResult.serverSideNextBatch;
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}
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// We collected all search results from the server as well as from Seshat,
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// we still have some events cached that we'll want to display on the next
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// pagination request.
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//
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// Provide a fake next batch token for that case.
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if (
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!response.next_batch &&
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isNotUndefined(previousSearchResult.cachedEvents) &&
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previousSearchResult.cachedEvents.length > 0
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) {
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response.next_batch = "cached";
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}
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return response;
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}
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interface IEncryptedSeshatEvent {
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curve25519Key?: string;
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ed25519Key?: string;
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algorithm?: string;
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forwardingCurve25519KeyChain?: string[];
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}
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function restoreEncryptionInfo(searchResultSlice: SearchResult[] = []): void {
|
|
for (const result of searchResultSlice) {
|
|
const timeline = result.context.getTimeline();
|
|
|
|
for (const mxEv of timeline) {
|
|
const ev = mxEv.event as IEncryptedSeshatEvent;
|
|
|
|
if (ev.curve25519Key) {
|
|
mxEv.makeEncrypted(
|
|
EventType.RoomMessageEncrypted,
|
|
{ algorithm: ev.algorithm },
|
|
ev.curve25519Key,
|
|
ev.ed25519Key!,
|
|
);
|
|
// @ts-ignore
|
|
mxEv.forwardingCurve25519KeyChain = ev.forwardingCurve25519KeyChain;
|
|
|
|
delete ev.curve25519Key;
|
|
delete ev.ed25519Key;
|
|
delete ev.algorithm;
|
|
delete ev.forwardingCurve25519KeyChain;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
async function combinedPagination(
|
|
client: MatrixClient,
|
|
searchResult: ISeshatSearchResults,
|
|
): Promise<ISeshatSearchResults> {
|
|
const eventIndex = EventIndexPeg.get();
|
|
|
|
const searchArgs = searchResult.seshatQuery;
|
|
const oldestEventFrom = searchResult.oldestEventFrom;
|
|
|
|
let localResult: IResultRoomEvents | undefined;
|
|
let serverSideResult: ISearchResponse | undefined;
|
|
|
|
// Fetch events from the local index if we have a token for it and if it's
|
|
// the local indexes turn or the server has exhausted its results.
|
|
if (searchArgs?.next_batch && (!searchResult.serverSideNextBatch || oldestEventFrom === "server")) {
|
|
localResult = await eventIndex!.search(searchArgs);
|
|
}
|
|
|
|
// Fetch events from the server if we have a token for it and if it's the
|
|
// local indexes turn or the local index has exhausted its results.
|
|
if (searchResult.serverSideNextBatch && (oldestEventFrom === "local" || !searchArgs?.next_batch)) {
|
|
const body = { body: searchResult._query!, next_batch: searchResult.serverSideNextBatch };
|
|
serverSideResult = await client.search(body);
|
|
}
|
|
|
|
const serverEvents: IResultRoomEvents | undefined = serverSideResult?.search_categories.room_events;
|
|
|
|
// Combine our events.
|
|
const combinedResult = combineResponses(searchResult, localResult, serverEvents);
|
|
|
|
const response = {
|
|
search_categories: {
|
|
room_events: combinedResult,
|
|
},
|
|
};
|
|
|
|
const oldResultCount = searchResult.results ? searchResult.results.length : 0;
|
|
|
|
// Let the client process the combined result.
|
|
const result = client.processRoomEventsSearch(searchResult, response);
|
|
|
|
// Restore our encryption info so we can properly re-verify the events.
|
|
const newResultCount = result.results.length - oldResultCount;
|
|
const newSlice = result.results.slice(Math.max(result.results.length - newResultCount, 0));
|
|
restoreEncryptionInfo(newSlice);
|
|
|
|
searchResult.pendingRequest = undefined;
|
|
|
|
return result;
|
|
}
|
|
|
|
function eventIndexSearch(
|
|
client: MatrixClient,
|
|
term: string,
|
|
roomId?: string,
|
|
abortSignal?: AbortSignal,
|
|
): Promise<ISearchResults> {
|
|
let searchPromise: Promise<ISearchResults>;
|
|
|
|
if (roomId !== undefined) {
|
|
if (client.isRoomEncrypted(roomId)) {
|
|
// The search is for a single encrypted room, use our local
|
|
// search method.
|
|
searchPromise = localSearchProcess(client, term, roomId);
|
|
} else {
|
|
// The search is for a single non-encrypted room, use the
|
|
// server-side search.
|
|
searchPromise = serverSideSearchProcess(client, term, roomId, abortSignal);
|
|
}
|
|
} else {
|
|
// Search across all rooms, combine a server side search and a
|
|
// local search.
|
|
searchPromise = combinedSearch(client, term, abortSignal);
|
|
}
|
|
|
|
return searchPromise;
|
|
}
|
|
|
|
function eventIndexSearchPagination(
|
|
client: MatrixClient,
|
|
searchResult: ISeshatSearchResults,
|
|
): Promise<ISeshatSearchResults> {
|
|
const seshatQuery = searchResult.seshatQuery;
|
|
const serverQuery = searchResult._query;
|
|
|
|
if (!seshatQuery) {
|
|
// This is a search in a non-encrypted room. Do the normal server-side
|
|
// pagination.
|
|
return client.backPaginateRoomEventsSearch(searchResult);
|
|
} else if (!serverQuery) {
|
|
// This is a search in a encrypted room. Do a local pagination.
|
|
const promise = localPagination(client, searchResult);
|
|
searchResult.pendingRequest = promise;
|
|
|
|
return promise;
|
|
} else {
|
|
// We have both queries around, this is a search across all rooms so a
|
|
// combined pagination needs to be done.
|
|
const promise = combinedPagination(client, searchResult);
|
|
searchResult.pendingRequest = promise;
|
|
|
|
return promise;
|
|
}
|
|
}
|
|
|
|
export function searchPagination(client: MatrixClient, searchResult: ISearchResults): Promise<ISearchResults> {
|
|
const eventIndex = EventIndexPeg.get();
|
|
|
|
if (searchResult.pendingRequest) return searchResult.pendingRequest;
|
|
|
|
if (eventIndex === null) return client.backPaginateRoomEventsSearch(searchResult);
|
|
else return eventIndexSearchPagination(client, searchResult);
|
|
}
|
|
|
|
export default function eventSearch(
|
|
client: MatrixClient,
|
|
term: string,
|
|
roomId?: string,
|
|
abortSignal?: AbortSignal,
|
|
): Promise<ISearchResults> {
|
|
const eventIndex = EventIndexPeg.get();
|
|
|
|
if (eventIndex === null) {
|
|
return serverSideSearchProcess(client, term, roomId, abortSignal);
|
|
} else {
|
|
return eventIndexSearch(client, term, roomId, abortSignal);
|
|
}
|
|
}
|