lemmy-ui/src/server/index.tsx

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import express from "express";
import fs from "fs";
import { IncomingHttpHeaders } from "http";
import { Helmet } from "inferno-helmet";
import { matchPath, StaticRouter } from "inferno-router";
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import { renderToString } from "inferno-server";
import IsomorphicCookie from "isomorphic-cookie";
import { GetSite, GetSiteResponse, LemmyHttp } from "lemmy-js-client";
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import path from "path";
import process from "process";
import serialize from "serialize-javascript";
import { App } from "../shared/components/app/app";
import { httpBaseInternal } from "../shared/env";
import {
ILemmyConfig,
InitialFetchRequest,
IsoData,
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} from "../shared/interfaces";
import { routes } from "../shared/routes";
import { initializeSite } from "../shared/utils";
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const server = express();
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const [hostname, port] = process.env["LEMMY_UI_HOST"]
? process.env["LEMMY_UI_HOST"].split(":")
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: ["0.0.0.0", "1234"];
const extraThemesFolder =
process.env["LEMMY_UI_EXTRA_THEMES_FOLDER"] || "./extra_themes";
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if (!process.env["LEMMY_UI_DISABLE_CSP"] && !process.env["LEMMY_UI_DEBUG"]) {
server.use(function (_req, res, next) {
res.setHeader(
"Content-Security-Policy",
`default-src 'self'; connect-src *; img-src * data:; script-src 'self' 'unsafe-inline' 'unsafe-eval'; style-src 'self' 'unsafe-inline'; form-action 'self'; base-uri 'self'; frame-src *`
);
next();
});
}
const customHtmlHeader = process.env["LEMMY_UI_CUSTOM_HTML_HEADER"] || "";
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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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const robotstxt = `User-Agent: *
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Disallow: /login
Disallow: /settings
Disallow: /create_community
Disallow: /create_post
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Disallow: /create_private_message
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Disallow: /inbox
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Disallow: /setup
Disallow: /admin
Disallow: /password_change
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Disallow: /search/
`;
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server.get("/robots.txt", async (_req, res) => {
res.setHeader("content-type", "text/plain; charset=utf-8");
res.send(robotstxt);
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});
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server.get("/css/themes/:name", async (req, res) => {
res.contentType("text/css");
const theme = req.params.name;
if (!theme.endsWith(".css")) {
res.send("Theme must be a css file");
}
const customTheme = path.resolve(`./${extraThemesFolder}/${theme}`);
if (fs.existsSync(customTheme)) {
res.sendFile(customTheme);
} else {
const internalTheme = path.resolve(`./dist/assets/css/themes/${theme}`);
res.sendFile(internalTheme);
}
});
function buildThemeList(): string[] {
let themes = [
"litera",
"materia",
"minty",
"solar",
"united",
"cyborg",
"darkly",
"darkly-red",
"journal",
"sketchy",
"vaporwave",
"vaporwave-dark",
"i386",
"litely",
"litely-red",
"nord",
];
if (fs.existsSync(extraThemesFolder)) {
let dirThemes = fs.readdirSync(extraThemesFolder);
let cssThemes = dirThemes
.filter(d => d.endsWith(".css"))
.map(d => d.replace(".css", ""));
themes.push(...cssThemes);
}
return themes;
}
server.get("/css/themelist", async (_req, res) => {
res.type("json");
res.send(JSON.stringify(buildThemeList()));
});
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// server.use(cookieParser());
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server.get("/*", async (req, res) => {
try {
const activeRoute = routes.find(route => matchPath(req.path, route));
const context = {} as any;
let auth: string | undefined = IsomorphicCookie.load("jwt", req);
let getSiteForm: GetSite = { auth };
let promises: Promise<any>[] = [];
let headers = setForwardedHeaders(req.headers);
let initialFetchReq: InitialFetchRequest = {
client: new LemmyHttp(httpBaseInternal, headers),
auth,
path: req.path,
};
// Get site data first
// 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"
);
getSiteForm.auth = undefined;
initialFetchReq.auth = undefined;
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);
// Redirect to the 404 if there's an API error
if (routeData[0] && routeData[0].error) {
let errCode = routeData[0].error;
console.error(errCode);
if (errCode == "instance_is_private") {
return res.redirect(`/signup`);
} else {
return res.send(`404: ${removeAuthParam(errCode)}`);
}
}
let isoData: IsoData = {
path: req.path,
site_res: site,
routeData,
};
const wrapper = (
<StaticRouter location={req.url} context={isoData}>
<App />
</StaticRouter>
);
if (context.url) {
return res.redirect(context.url);
}
const eruda = (
<>
<script src="//cdn.jsdelivr.net/npm/eruda"></script>
<script>eruda.init();</script>
</>
);
const erudaStr = process.env["LEMMY_UI_DEBUG"] ? renderToString(eruda) : "";
const root = renderToString(wrapper);
const helmet = Helmet.renderStatic();
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const config: ILemmyConfig = { wsHost: process.env.LEMMY_UI_LEMMY_WS_HOST };
res.send(`
<!DOCTYPE html>
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<html ${helmet.htmlAttributes.toString()} lang="en">
<head>
<script>window.isoData = ${JSON.stringify(isoData)}</script>
<script>window.lemmyConfig = ${serialize(config)}</script>
<!-- A remote debugging utility for mobile -->
${erudaStr}
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<!-- Custom injected script -->
${customHtmlHeader}
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${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">
<!-- 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()}
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</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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`);
} catch (err) {
console.error(err);
return res.send(`404: ${removeAuthParam(err)}`);
}
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});
server.listen(Number(port), hostname, () => {
console.log(`http://${hostname}:${port}`);
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});
function setForwardedHeaders(headers: IncomingHttpHeaders): {
[key: string]: string;
} {
let out: { [key: string]: string } = {};
if (headers.host) {
out.host = headers.host;
}
let realIp = headers["x-real-ip"];
if (realIp) {
out["x-real-ip"] = realIp as string;
}
let forwardedFor = headers["x-forwarded-for"];
if (forwardedFor) {
out["x-forwarded-for"] = forwardedFor as string;
}
return out;
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}
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process.on("SIGINT", () => {
console.info("Interrupted");
process.exit(0);
});
function removeAuthParam(err: any): string {
return removeParam(err.toString(), "auth");
}
function removeParam(url: string, parameter: string): string {
return url
.replace(new RegExp("[?&]" + parameter + "=[^&#]*(#.*)?$"), "$1")
.replace(new RegExp("([?&])" + parameter + "=[^&]*&"), "$1");
}