69 lines
2.5 KiB
JavaScript
69 lines
2.5 KiB
JavaScript
import { URL } from "node:url";
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import { getJson, getResponse } from "../misc/fetch.js";
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import config from "../config/index.js";
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import { XMLParser } from "fast-xml-parser";
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export default async function(query) {
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const hostMetaUrl = queryToHostMetaUrl(query);
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const webFingerTemplate = await hostMetaToWebFingerTemplate(hostMetaUrl) ?? queryToWebFingerTemplate(query);
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const url = genWebFingerUrl(query, webFingerTemplate);
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return await getJson(url, "application/jrd+json, application/json");
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}
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async function hostMetaToWebFingerTemplate(url) {
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try {
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const res = await getResponse({
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url,
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method: "GET",
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headers: Object.assign({
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"User-Agent": config.userAgent,
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Accept: "application/xrd+xml"
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}, {}),
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timeout: 10000
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});
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const options = {
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ignoreAttributes: false,
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isArray: (_name, jpath)=>jpath === 'XRD.Link'
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};
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const parser = new XMLParser(options);
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const hostMeta = parser.parse(await res.text());
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const template = hostMeta['XRD']['Link'].filter((p)=>p['@_rel'] === 'lrdd')[0]['@_template'];
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return template.indexOf('{uri}') < 0 ? null : template;
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} catch {
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return null;
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}
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}
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function queryToWebFingerTemplate(query) {
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if (query.match(/^https?:\/\//)) {
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const u = new URL(query);
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return `${u.protocol}//${u.hostname}/.well-known/webfinger?resource={uri}`;
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}
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const m = query.match(/^([^@]+)@(.*)/);
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if (m) {
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const hostname = m[2];
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return `https://${hostname}/.well-known/webfinger?resource={uri}`;
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}
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throw new Error(`Invalid query (${query})`);
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}
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function queryToHostMetaUrl(query) {
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if (query.match(/^https?:\/\//)) {
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const u = new URL(query);
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return `${u.protocol}//${u.hostname}/.well-known/host-meta`;
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}
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const m = query.match(/^([^@]+)@(.*)/);
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if (m) {
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const hostname = m[2];
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return `https://${hostname}/.well-known/host-meta`;
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}
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throw new Error(`Invalid query (${query})`);
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}
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function genWebFingerUrl(query, webFingerTemplate) {
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if (webFingerTemplate.indexOf('{uri}') < 0) throw new Error(`Invalid webFingerUrl: ${webFingerTemplate}`);
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if (query.match(/^https?:\/\//)) {
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return webFingerTemplate.replace('{uri}', encodeURIComponent(query));
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}
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const m = query.match(/^([^@]+)@(.*)/);
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if (m) {
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return webFingerTemplate.replace('{uri}', encodeURIComponent(`acct:${query}`));
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}
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throw new Error(`Invalid query (${query})`);
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}
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