73 lines
2.5 KiB
TypeScript
73 lines
2.5 KiB
TypeScript
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import { type Event, type Filter, findReplyTag } from '@/deps.ts';
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import { eventDateComparator, type PaginationParams } from '@/utils.ts';
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import { getFilters as getFiltersMixer } from './mixer.ts';
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/** Get a Nostr event by its ID. */
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const getEvent = async <K extends number = number>(id: string, kind?: K): Promise<Event<K> | undefined> => {
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const filter: Filter<K> = { ids: [id], limit: 1 };
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if (kind) filter.kinds = [kind];
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const [event] = await getFiltersMixer([filter], { limit: 1, timeout: 1000 });
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return event;
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};
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/** Get a Nostr `set_medatadata` event for a user's pubkey. */
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const getAuthor = async (pubkey: string, timeout = 1000): Promise<Event<0> | undefined> => {
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const [event] = await getFiltersMixer([{ authors: [pubkey], kinds: [0] }], { timeout });
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return event;
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};
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/** Get users the given pubkey follows. */
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const getFollows = async (pubkey: string): Promise<Event<3> | undefined> => {
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const [event] = await getFiltersMixer([{ authors: [pubkey], kinds: [3] }], { timeout: 5000 });
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return event;
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};
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/** Get events from people the user follows. */
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async function getFeed(event3: Event<3>, params: PaginationParams): Promise<Event<1>[]> {
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const authors = event3.tags
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.filter((tag) => tag[0] === 'p')
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.map((tag) => tag[1]);
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authors.push(event3.pubkey); // see own events in feed
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const filter: Filter = {
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authors,
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kinds: [1],
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...params,
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};
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const results = await getFiltersMixer([filter], { timeout: 5000 }) as Event<1>[];
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return results.sort(eventDateComparator);
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}
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/** Get a feed of all known text notes. */
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async function getPublicFeed(params: PaginationParams): Promise<Event<1>[]> {
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const results = await getFiltersMixer([{ kinds: [1], ...params }], { timeout: 5000 });
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return results.sort(eventDateComparator);
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}
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async function getAncestors(event: Event<1>, result = [] as Event<1>[]): Promise<Event<1>[]> {
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if (result.length < 100) {
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const replyTag = findReplyTag(event);
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const inReplyTo = replyTag ? replyTag[1] : undefined;
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if (inReplyTo) {
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const parentEvent = await getEvent(inReplyTo, 1);
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if (parentEvent) {
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result.push(parentEvent);
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return getAncestors(parentEvent, result);
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}
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}
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}
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return result.reverse();
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}
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function getDescendants(eventId: string): Promise<Event<1>[]> {
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return getFiltersMixer([{ kinds: [1], '#e': [eventId] }], { limit: 200, timeout: 2000 }) as Promise<Event<1>[]>;
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}
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export { getAncestors, getAuthor, getDescendants, getEvent, getFeed, getFollows, getPublicFeed };
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