lemmy-ui/src/server/index.tsx

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import serialize from 'serialize-javascript';
import express from 'express';
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import { StaticRouter } from 'inferno-router';
import { renderToString } from 'inferno-server';
import { matchPath } from 'inferno-router';
import path from 'path';
import { App } from '../shared/components/app';
import { InitialFetchRequest, IsoData } from '../shared/interfaces';
import { routes } from '../shared/routes';
import IsomorphicCookie from 'isomorphic-cookie';
import { setAuth } from '../shared/utils';
import { GetSiteForm, LemmyHttp } from 'lemmy-js-client';
import process from 'process';
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import { Helmet } from 'inferno-helmet';
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import { initializeSite } from '../shared/initialize';
import { httpUri } from '../shared/env';
import { IncomingHttpHeaders } from 'http';
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const server = express();
const port = 1234;
server.use(express.json());
server.use(express.urlencoded({ extended: false }));
server.use('/static', express.static(path.resolve('./dist')));
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// server.use(cookieParser());
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server.get('/*', async (req, res) => {
const activeRoute = routes.find(route => matchPath(req.path, route)) || {};
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const context = {} as any;
let auth: string = IsomorphicCookie.load('jwt', req);
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let getSiteForm: GetSiteForm = {};
setAuth(getSiteForm, auth);
let promises: Promise<any>[] = [];
let headers = setForwardedHeaders(req.headers);
let initialFetchReq: InitialFetchRequest = {
client: new LemmyHttp(httpUri, headers),
auth,
path: req.path,
};
// Get site data first
let site = await initialFetchReq.client.getSite(getSiteForm);
initializeSite(site);
if (activeRoute.fetchInitialData) {
promises.push(...activeRoute.fetchInitialData(initialFetchReq));
}
let routeData = await Promise.all(promises);
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// Redirect to the 404 if there's an API error
if (routeData[0] && routeData[0].error) {
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let errCode = routeData[0].error;
return res.redirect(`/404?err=${errCode}`);
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}
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let acceptLang = req.headers['accept-language']
? req.headers['accept-language'].split(',')[0]
: 'en';
let lang = !!site.my_user
? site.my_user.lang == 'browser'
? acceptLang
: 'en'
: acceptLang;
let isoData: IsoData = {
path: req.path,
site,
routeData,
lang,
};
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const wrapper = (
<StaticRouter location={req.url} context={isoData}>
<App site={isoData.site} />
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</StaticRouter>
);
if (context.url) {
return res.redirect(context.url);
}
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const cspHtml = (
<meta
http-equiv="Content-Security-Policy"
content="default-src 'none'; connect-src 'self'; frame-src *; img-src *; script-src 'self' 'unsafe-inline'; style-src 'self' 'unsafe-inline'"
/>
);
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const root = renderToString(wrapper);
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const cspStr = process.env.LEMMY_EXTERNAL_HOST ? renderToString(cspHtml) : '';
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const helmet = Helmet.renderStatic();
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res.send(`
<!DOCTYPE html>
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<html ${helmet.htmlAttributes.toString()} lang="en">
<head>
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<script>window.isoData = ${serialize(isoData)}</script>
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${helmet.title.toString()}
${helmet.meta.toString()}
<!-- Required meta tags -->
<meta name="Description" content="Lemmy">
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<!-- Content Security Policy -->
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${cspStr}
<!-- Web app manifest -->
<link rel="manifest" href="/static/assets/manifest.webmanifest">
<!-- Icons -->
<link rel="shortcut icon" type="image/svg+xml" href="/static/assets/icons/favicon.svg" />
<link rel="apple-touch-icon" href="/static/assets/icons/apple-touch-icon.png" />
<!-- Styles -->
<link rel="stylesheet" type="text/css" href="/static/styles/styles.css" />
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<!-- Current theme and more -->
${helmet.link.toString()}
</head>
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<body ${helmet.bodyAttributes.toString()}>
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<noscript>
<div class="alert alert-danger rounded-0" role="alert">
<b>Javascript is disabled. Actions will not work.</b>
</div>
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</noscript>
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<div id='root'>${root}</div>
<script defer src='/static/js/client.js'></script>
</body>
</html>
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`);
});
server.listen(port, () => {
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console.log(`http://localhost:${port}`);
});
function setForwardedHeaders(
headers: IncomingHttpHeaders
): { [key: string]: string } {
let out = {
host: headers.host,
};
if (headers['x-real-ip']) {
out['x-real-ip'] = headers['x-real-ip'];
}
if (headers['x-forwarded-for']) {
out['x-forwarded-for'] = headers['x-forwarded-for'];
}
return out;
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}
process.on('SIGINT', () => {
console.info('Interrupted');
process.exit(0);
});