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65 lines
2.3 KiB
TypeScript
65 lines
2.3 KiB
TypeScript
import {Event} from 'nostr-tools';
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import {zeroLeadingBitsCount} from './utils/crypto';
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export const isEvent = <T>(evt?: T): evt is T => evt !== undefined;
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export const isMention = ([tag, , , marker]: string[]) => tag === 'e' && marker === 'mention';
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export const isPTag = ([tag]: string[]) => tag === 'p';
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export const hasEventTag = (tag: string[]) => tag[0] === 'e';
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export const isNotNonceTag = ([tag]: string[]) => tag !== 'nonce';
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/**
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* validate proof-of-work of a nostr event per nip-13.
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* the validation always requires difficulty commitment in the nonce tag.
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*
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* @param {EventObj} evt event to validate
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* TODO: @param {number} targetDifficulty target proof-of-work difficulty
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*/
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export const validatePow = (evt: Event) => {
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const tag = evt.tags.find(tag => tag[0] === 'nonce');
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if (!tag) {
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return false;
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}
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const difficultyCommitment = Number(tag[2]);
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if (!difficultyCommitment || Number.isNaN(difficultyCommitment)) {
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return false;
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}
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return zeroLeadingBitsCount(evt.id) >= difficultyCommitment;
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}
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export const sortByCreatedAt = (evt1: Event, evt2: Event) => {
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if (evt1.created_at === evt2.created_at) {
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// console.log('TODO: OMG exactly at the same time, figure out how to sort then', evt1, evt2);
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}
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return evt1.created_at > evt2.created_at ? -1 : 1;
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};
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export const sortEventCreatedAt = (created_at: number) => (
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{created_at: a}: Event,
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{created_at: b}: Event,
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) => (
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Math.abs(a - created_at) < Math.abs(b - created_at) ? -1 : 1
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);
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const isReply = ([tag, , , marker]: string[]) => tag === 'e' && marker !== 'mention';
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/**
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* find reply-to ID according to nip-10, find marked reply or root tag or
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* fallback to positional (last) e tag or return null
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* @param {event} evt
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* @returns replyToID | null
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*/
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export const getReplyTo = (evt: Event): string | null => {
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const eventTags = evt.tags.filter(isReply);
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const withReplyMarker = eventTags.filter(([, , , marker]) => marker === 'reply');
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if (withReplyMarker.length === 1) {
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return withReplyMarker[0][1];
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}
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const withRootMarker = eventTags.filter(([, , , marker]) => marker === 'root');
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if (withReplyMarker.length === 0 && withRootMarker.length === 1) {
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return withRootMarker[0][1];
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}
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// fallback to deprecated positional 'e' tags (nip-10)
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const lastTag = eventTags.at(-1);
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return lastTag ? lastTag[1] : null;
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};
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