import Koa from 'koa'; import summaly from 'summaly'; import { fetchMeta } from '@/misc/fetch-meta.js'; import Logger from '@/services/logger.js'; import config from '@/config/index.js'; import { query } from '@/prelude/url.js'; import { getJson } from '@/misc/fetch.js'; const logger = new Logger('url-preview'); export const urlPreviewHandler = async (ctx: Koa.Context) => { const url = ctx.query.url; if (typeof url !== 'string') { ctx.status = 400; return; } const lang = ctx.query.lang; if (Array.isArray(lang)) { ctx.status = 400; return; } const meta = await fetchMeta(); logger.info(meta.summalyProxy ? `(Proxy) Getting preview of ${url}@${lang} ...` : `Getting preview of ${url}@${lang} ...`); try { const summary = meta.summalyProxy ? await getJson(`${meta.summalyProxy}?${query({ url: url, lang: lang ?? 'ja-JP', })}`) : await summaly.default(url, { followRedirects: false, lang: lang ?? 'ja-JP', }); logger.succ(`Got preview of ${url}: ${summary.title}`); summary.icon = wrap(summary.icon); summary.thumbnail = wrap(summary.thumbnail); // Cache 7days ctx.set('Cache-Control', 'max-age=604800, immutable'); ctx.body = summary; } catch (err) { logger.warn(`Failed to get preview of ${url}: ${err}`); ctx.status = 200; ctx.set('Cache-Control', 'max-age=86400, immutable'); ctx.body = '{}'; } }; function wrap(url?: string): string | null { return url != null ? url.match(/^https?:\/\//) ? `${config.url}/proxy/preview.webp?${query({ url, preview: '1', })}` : url : null; }