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hotomoe/src/server/web/url-preview.ts

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import * as Koa from 'koa';
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import * as request from 'request-promise-native';
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import summaly from 'summaly';
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import fetchMeta from '../../misc/fetch-meta';
import Logger from '../../services/logger';
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const logger = new Logger('url-preview');
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module.exports = async (ctx: Koa.BaseContext) => {
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const meta = await fetchMeta();
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logger.info(meta.summalyProxy
? `(Proxy) Getting preview of ${ctx.query.url} ...`
: `Getting preview of ${ctx.query.url} ...`);
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try {
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const summary = meta.summalyProxy ? await request.get({
url: meta.summalyProxy,
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qs: {
url: ctx.query.url
},
json: true
}) : await summaly(ctx.query.url, {
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followRedirects: false
});
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logger.succ(`Got preview of ${ctx.query.url}: ${summary.title}`);
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summary.icon = wrap(summary.icon);
summary.thumbnail = wrap(summary.thumbnail);
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// Cache 7days
ctx.set('Cache-Control', 'max-age=604800, immutable');
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ctx.body = summary;
} catch (e) {
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logger.error(`Failed to get preview of ${ctx.query.url}: ${e}`);
ctx.status = 200;
ctx.set('Cache-Control', 'max-age=86400, immutable');
ctx.body = '{}';
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}
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};
function wrap(url: string): string {
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return url != null
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? url.match(/^https?:\/\//)
? `https://images.weserv.nl/?url=${encodeURIComponent(url.replace(/^http:\/\//, '').replace(/^https:\/\//, 'ssl:'))}&w=200&h=200`
: url
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: null;
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}