WebFingerリクエストで Proxy, Keep-Alive などをサポート (#4658)

* no webfinger.js

* Fix: エラーメッセージがくどい

src/remote/resolve-user.ts

@@ -79,8 +79,8 @@ export default async (username: string, _host: string, option?: any, resync?: bo
 async function resolveSelf(acctLower: string) {
 	logger.info(`WebFinger for ${chalk.yellow(acctLower)}`);
 	const finger = await webFinger(acctLower).catch(e => {
-		logger.error(`Failed to WebFinger for ${chalk.yellow(acctLower)}: ${e.message} (${e.status})`);
-		throw e;
+		logger.error(`Failed to WebFinger for ${chalk.yellow(acctLower)}: ${ e.statusCode || e.message }`);
+		throw new Error(`Failed to WebFinger for ${acctLower}: ${ e.statusCode || e.message }`);
 	});
 	const self = finger.links.find(link => link.rel && link.rel.toLowerCase() === 'self');
 	if (!self) {

src/remote/webfinger.ts

@@ -1,6 +1,7 @@
-import { WebFinger } from 'webfinger.js';
-
-const webFinger = new WebFinger({ });
+import config from '../config';
+import * as request from 'request-promise-native';
+import { URL } from 'url';
+import { query as urlQuery } from '../prelude/url';
 
 type ILink = {
 	href: string;
@@ -12,12 +13,33 @@ type IWebFinger = {
 	subject: string;
 };
 
-export default async function resolve(query: any): Promise<IWebFinger> {
-	return await new Promise((res, rej) => webFinger.lookup(query, (error: Error | string, result: any) => {
-		if (error) {
-			return rej(error);
-		}
+export default async function(query: string): Promise<IWebFinger> {
+	const url = genUrl(query);
 
-		res(result.object);
-	})) as IWebFinger;
+	return await request({
+		url,
+		proxy: config.proxy,
+		timeout: 10 * 1000,
+		forever: true,
+		headers: {
+			'User-Agent': config.userAgent,
+			Accept: 'application/jrd+json, application/json'
+		},
+		json: true
+	});
+}
+
+function genUrl(query: string) {
+	if (query.match(/^https?:\/\//)) {
+		const u = new URL(query);
+		return `${u.protocol}//${u.hostname}/.well-known/webfinger?` + urlQuery({ resource: query });
+	}
+
+	const m = query.match(/^([^@]+)@(.*)/);
+	if (m) {
+		const hostname = m[2];
+		return `https://${hostname}/.well-known/webfinger?` + urlQuery({ resource: `acct:${query}` });
+	}
+
+	throw new Error(`Invalied query (${query})`);
 }