159 lines
4.1 KiB
TypeScript
159 lines
4.1 KiB
TypeScript
import * as secp from "@noble/secp256k1";
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import { bech32 } from "bech32";
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import { HexKey, TaggedRawEvent, u256 } from "Nostr";
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import EventKind from "Nostr/EventKind";
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export async function openFile(): Promise<File | undefined> {
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return new Promise((resolve, reject) => {
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let elm = document.createElement("input");
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elm.type = "file";
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elm.onchange = (e: Event) => {
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let elm = e.target as HTMLInputElement;
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if (elm.files) {
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resolve(elm.files[0]);
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} else {
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resolve(undefined);
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}
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};
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elm.click();
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});
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}
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/**
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* Parse bech32 ids
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* https://github.com/nostr-protocol/nips/blob/master/19.md
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* @param id bech32 id
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*/
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export function parseId(id: string) {
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const hrp = ["note", "npub", "nsec"];
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try {
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if (hrp.some(a => id.startsWith(a))) {
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return bech32ToHex(id);
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}
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} catch (e) { }
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return id;
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}
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export function bech32ToHex(str: string) {
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let nKey = bech32.decode(str);
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let buff = bech32.fromWords(nKey.words);
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return secp.utils.bytesToHex(Uint8Array.from(buff));
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}
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/**
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* Decode bech32 to string UTF-8
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* @param str bech32 encoded string
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* @returns
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*/
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export function bech32ToText(str: string) {
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let decoded = bech32.decode(str, 1000);
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let buf = bech32.fromWords(decoded.words);
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return new TextDecoder().decode(Uint8Array.from(buf));
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}
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/**
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* Convert hex note id to bech32 link url
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* @param hex
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* @returns
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*/
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export function eventLink(hex: u256) {
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return `/e/${hexToBech32("note", hex)}`;
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}
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/**
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* Convert hex to bech32
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* @param {string} hex
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*/
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export function hexToBech32(hrp: string, hex: string) {
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if (typeof hex !== "string" || hex.length === 0 || hex.length % 2 !== 0) {
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return "";
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}
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try {
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let buf = secp.utils.hexToBytes(hex);
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return bech32.encode(hrp, bech32.toWords(buf));
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} catch (e) {
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console.warn("Invalid hex", hex, e);
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return "";
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}
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}
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/**
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* Convert hex pubkey to bech32 link url
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* @param {string} hex
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* @returns
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*/
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export function profileLink(hex: HexKey) {
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return `/p/${hexToBech32("npub", hex)}`;
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}
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/**
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* Reaction types
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*/
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export const Reaction = {
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Positive: "+",
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Negative: "-"
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};
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/**
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* Return normalized reaction content
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* @param {string} content
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* @returns
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*/
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export function normalizeReaction(content: string) {
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switch (content) {
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case "": return Reaction.Positive;
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case "🤙": return Reaction.Positive;
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case "❤️": return Reaction.Positive;
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case "👍": return Reaction.Positive;
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case "💯": return Reaction.Positive;
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case "+": return Reaction.Positive;
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case "-": return Reaction.Negative;
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case "👎": return Reaction.Negative;
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}
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return content;
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}
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/**
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* Get reactions to a specific event (#e + kind filter)
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*/
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export function getReactions(notes: TaggedRawEvent[], id: u256, kind = EventKind.Reaction) {
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return notes?.filter(a => a.kind === kind && a.tags.some(a => a[0] === "e" && a[1] === id)) || [];
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}
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/**
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* Converts LNURL service to LN Address
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* @param lnurl
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* @returns
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*/
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export function extractLnAddress(lnurl: string) {
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// some clients incorrectly set this to LNURL service, patch this
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if (lnurl.toLowerCase().startsWith("lnurl")) {
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let url = bech32ToText(lnurl);
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if (url.startsWith("http")) {
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let parsedUri = new URL(url);
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// is lightning address
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if (parsedUri.pathname.startsWith("/.well-known/lnurlp/")) {
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let pathParts = parsedUri.pathname.split('/');
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let username = pathParts[pathParts.length - 1];
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return `${username}@${parsedUri.hostname}`;
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}
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}
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}
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return lnurl;
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}
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export function unixNow() {
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return Math.floor(new Date().getTime() / 1000);
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}
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/**
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* Simple debounce
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* @param timeout Time until falling edge
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* @param fn Callack to run on falling edge
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* @returns Cancel timeout function
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*/
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export function debounce(timeout: number, fn: () => void) {
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let t = setTimeout(fn, timeout);
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return () => clearTimeout(t);
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} |