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import * as Koa from 'koa';
import * as request from 'request-promise-native';
import summaly from 'summaly';
import fetchMeta from '../../misc/fetch-meta';
import Logger from '../../services/logger';
import config from '../../config';
import { query } from '../../prelude/url';
const logger = new Logger('url-preview');
module.exports = async (ctx: Koa.BaseContext) => {
const meta = await fetchMeta();
logger.info(meta.summalyProxy
? `(Proxy) Getting preview of ${ctx.query.url} ...`
: `Getting preview of ${ctx.query.url} ...`);
try {
const summary = meta.summalyProxy ? await request.get({
url: meta.summalyProxy,
qs: {
url: ctx.query.url
},
json: true
}) : await summaly(ctx.query.url, {
followRedirects: false
});
logger.succ(`Got preview of ${ctx.query.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 (e) {
logger.error(`Failed to get preview of ${ctx.query.url}: ${e}`);
ctx.status = 200;
ctx.set('Cache-Control', 'max-age=86400, immutable');
ctx.body = '{}';
}
};
function wrap(url?: string): string | null {
return url != null
? url.match(/^https?:\/\//)
? `${config.url}/proxy/preview.jpg?${query({
url,
preview: '1'
})}`
: url
: null;
}
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