lemmy-ui/src/server/index.tsx

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import serialize from "serialize-javascript";
import express from "express";
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 {
ILemmyConfig,
InitialFetchRequest,
IsoData,
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} from "../shared/interfaces";
import { routes } from "../shared/routes";
import IsomorphicCookie from "isomorphic-cookie";
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import { GetSite, GetSiteResponse, LemmyHttp } from "lemmy-js-client";
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import process from "process";
import { Helmet } from "inferno-helmet";
import { initializeSite } from "../shared/initialize";
import { httpUri } from "../shared/env";
import { IncomingHttpHeaders } from "http";
import { setOptionalAuth } from "../shared/utils";
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const server = express();
const port = 1234;
server.use(express.json());
server.use(express.urlencoded({ extended: false }));
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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;
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let auth: string = IsomorphicCookie.load("jwt", req);
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let getSiteForm: GetSite = {};
setOptionalAuth(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
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// This bypasses errors, so that the client can hit the error on its own,
// in order to remove the jwt on the browser. Necessary for wrong jwts
let try_site: any = await initialFetchReq.client.getSite(getSiteForm);
if (try_site.error == "not_logged_in") {
console.error(
"Incorrect JWT token, skipping auth so frontend can remove jwt cookie"
);
delete getSiteForm.auth;
delete initialFetchReq.auth;
try_site = await initialFetchReq.client.getSite(getSiteForm);
}
let site: GetSiteResponse = try_site;
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
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? site.my_user.local_user.lang == "browser"
? acceptLang
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: "en"
: acceptLang;
let isoData: IsoData = {
path: req.path,
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site_res: site,
routeData,
lang,
};
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const wrapper = (
<StaticRouter location={req.url} context={isoData}>
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<App siteRes={isoData.site_res} />
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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"
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content="default-src data: 'self'; connect-src * ws: wss:; frame-src *; img-src * data:; script-src 'self'; style-src 'self' 'unsafe-inline'; manifest-src 'self'"
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/>
);
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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();
const config: ILemmyConfig = { wsHost: process.env.LEMMY_WS_HOST };
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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>
<script>window.lemmyConfig = ${serialize(config)}</script>
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${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">
<!-- 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,
};
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if (headers["x-real-ip"]) {
out["x-real-ip"] = headers["x-real-ip"];
}
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if (headers["x-forwarded-for"]) {
out["x-forwarded-for"] = headers["x-forwarded-for"];
}
return out;
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}
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process.on("SIGINT", () => {
console.info("Interrupted");
process.exit(0);
});