90 lines
3.3 KiB
TypeScript
90 lines
3.3 KiB
TypeScript
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/*
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Copyright 2023 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 { MatrixEvent, Room } from "matrix-js-sdk/src/matrix";
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import { useEffect, useState } from "react";
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import { PillType } from "../components/views/elements/Pill";
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import { MatrixClientPeg } from "../MatrixClientPeg";
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import { PermalinkParts } from "../utils/permalinks/PermalinkConstructor";
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/**
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* Tries to find the initial event.
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* If the event should not be looked up or there is no target room it returns null.
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* Otherwise it tries to get the event from the target room.
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*
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* @param shouldLookUpEvent - whether the parmalink event should be looked up
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* @param Room | null targetRoom - target room of the permalink
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* @param parseResult - permalink parse result
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* @returns The event if found or null if it should not be looked up or was not found.
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*/
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const determineInitialEvent = (
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shouldLookUpEvent: boolean,
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targetRoom: Room | null,
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parseResult: PermalinkParts | null,
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): MatrixEvent | null => {
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if (!shouldLookUpEvent || !targetRoom || !parseResult?.eventId) return null;
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return targetRoom.findEventById(parseResult.eventId) || null;
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};
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/**
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* Hook to get a permalink target event
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*
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* @param type - Permalink type
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* @param parseResult - Permalink parse result
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* @param targetRoom - Target room of the permalink {@link ./usePermalinkTargetRoom.ts}
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* @returns The permalink event if it targets an event and it can be loaded.
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* Else null.
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*/
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export const usePermalinkEvent = (
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type: PillType | null,
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parseResult: PermalinkParts | null,
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targetRoom: Room | null,
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): MatrixEvent | null => {
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// Event permalinks require to know the event.
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// If it cannot be initially determined, it will be looked up later by a memo hook.
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const shouldLookUpEvent =
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!!type &&
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!!parseResult?.roomIdOrAlias &&
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!!parseResult?.eventId &&
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[PillType.EventInSameRoom, PillType.EventInOtherRoom].includes(type);
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const eventId = parseResult?.eventId;
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const eventInRoom = determineInitialEvent(shouldLookUpEvent, targetRoom, parseResult);
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const [event, setEvent] = useState<MatrixEvent | null>(eventInRoom);
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useEffect(() => {
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if (!shouldLookUpEvent || !eventId || event || !parseResult?.roomIdOrAlias || !parseResult.eventId) {
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// nothing to do here
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return;
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}
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const fetchRoomEvent = async (): Promise<void> => {
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try {
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const eventData = await MatrixClientPeg.get().fetchRoomEvent(
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parseResult.roomIdOrAlias,
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parseResult.eventId,
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);
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setEvent(new MatrixEvent(eventData));
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} catch {}
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};
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fetchRoomEvent();
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}, [event, eventId, parseResult?.eventId, parseResult?.roomIdOrAlias, shouldLookUpEvent]);
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return event;
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};
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