Resolve #3376

src/server/api/endpoints/admin/update-meta.ts

@@ -139,6 +139,13 @@ export const meta = {
 			}
 		},
 
+		summalyProxy: {
+			validator: $.str.optional.nullable,
+			desc: {
+				'ja-JP': 'summalyプロキシURL'
+			}
+		},
+
 		enableTwitterIntegration: {
 			validator: $.bool.optional,
 			desc: {
@@ -300,6 +307,10 @@ export default define(meta, (ps) => new Promise(async (res, rej) => {
 		set.langs = ps.langs;
 	}
 
+	if (ps.summalyProxy !== undefined) {
+		set.summalyProxy = ps.summalyProxy;
+	}
+
 	if (ps.enableTwitterIntegration !== undefined) {
 		set.enableTwitterIntegration = ps.enableTwitterIntegration;
 	}

src/server/api/endpoints/meta.ts

@@ -107,6 +107,7 @@ export default define(meta, (ps, me) => new Promise(async (res, rej) => {
 		response.githubClientSecret = instance.githubClientSecret;
 		response.discordClientId = instance.discordClientId;
 		response.discordClientSecret = instance.discordClientSecret;
+		response.summalyProxy = instance.summalyProxy;
 	}
 
 	res(response);

src/server/web/url-preview.ts

@@ -2,11 +2,14 @@ import * as Koa from 'koa';
 import * as request from 'request-promise-native';
 import summaly from 'summaly';
 import config from '../../config';
+import fetchMeta from '../../misc/fetch-meta';
 
 module.exports = async (ctx: Koa.Context) => {
+	const meta = await fetchMeta();
+
 	try {
-		const summary = config.summalyProxy ? await request.get({
-			url: config.summalyProxy,
+		const summary = meta.summalyProxy ? await request.get({
+			url: meta.summalyProxy,
 			proxy: config.proxy,
 			qs: {
 				url: ctx.query.url