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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;
}
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