1 import express from "express";
2 import { existsSync } from "fs";
3 import { readdir, readFile } from "fs/promises";
4 import { IncomingHttpHeaders } from "http";
5 import { Helmet } from "inferno-helmet";
6 import { matchPath, StaticRouter } from "inferno-router";
7 import { renderToString } from "inferno-server";
8 import IsomorphicCookie from "isomorphic-cookie";
9 import { GetSite, GetSiteResponse, LemmyHttp, Site } from "lemmy-js-client";
10 import path from "path";
11 import process from "process";
12 import sanitize from "sanitize-html";
13 import serialize from "serialize-javascript";
14 import sharp from "sharp";
15 import { App } from "../shared/components/app/app";
16 import { getHttpBase, getHttpBaseInternal } from "../shared/env";
21 } from "../shared/interfaces";
22 import { routes } from "../shared/routes";
29 } from "../shared/utils";
31 const server = express();
32 const [hostname, port] = process.env["LEMMY_UI_HOST"]
33 ? process.env["LEMMY_UI_HOST"].split(":")
34 : ["0.0.0.0", "1234"];
35 const extraThemesFolder =
36 process.env["LEMMY_UI_EXTRA_THEMES_FOLDER"] || "./extra_themes";
38 if (!process.env["LEMMY_UI_DISABLE_CSP"] && !process.env["LEMMY_UI_DEBUG"]) {
39 server.use(function (_req, res, next) {
41 "Content-Security-Policy",
42 `default-src 'self'; manifest-src *; 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 *; media-src *`
47 const customHtmlHeader = process.env["LEMMY_UI_CUSTOM_HTML_HEADER"] || "";
49 server.use(express.json());
50 server.use(express.urlencoded({ extended: false }));
51 server.use("/static", express.static(path.resolve("./dist")));
53 const robotstxt = `User-Agent: *
56 Disallow: /create_community
57 Disallow: /create_post
58 Disallow: /create_private_message
62 Disallow: /password_change
66 server.get("/service-worker.js", async (_req, res) => {
67 res.setHeader("Content-Type", "application/javascript");
68 res.sendFile(path.resolve("./dist/service-worker.js"));
71 server.get("/robots.txt", async (_req, res) => {
72 res.setHeader("content-type", "text/plain; charset=utf-8");
76 server.get("/css/themes/:name", async (req, res) => {
77 res.contentType("text/css");
78 const theme = req.params.name;
79 if (!theme.endsWith(".css")) {
81 res.send("Theme must be a css file");
84 const customTheme = path.resolve(`./${extraThemesFolder}/${theme}`);
85 if (existsSync(customTheme)) {
86 res.sendFile(customTheme);
88 const internalTheme = path.resolve(`./dist/assets/css/themes/${theme}`);
90 // If the theme doesn't exist, just send litely
91 if (existsSync(internalTheme)) {
92 res.sendFile(internalTheme);
94 res.sendFile(path.resolve("./dist/assets/css/themes/litely.css"));
99 async function buildThemeList(): Promise<string[]> {
100 const themes = ["darkly", "darkly-red", "litely", "litely-red"];
101 if (existsSync(extraThemesFolder)) {
102 const dirThemes = await readdir(extraThemesFolder);
103 const cssThemes = dirThemes
104 .filter(d => d.endsWith(".css"))
105 .map(d => d.replace(".css", ""));
106 themes.push(...cssThemes);
111 server.get("/css/themelist", async (_req, res) => {
113 res.send(JSON.stringify(await buildThemeList()));
116 // server.use(cookieParser());
117 server.get("/*", async (req, res) => {
119 const activeRoute = routes.find(route => matchPath(req.path, route));
120 let auth: string | undefined = IsomorphicCookie.load("jwt", req);
122 const getSiteForm: GetSite = { auth };
124 const headers = setForwardedHeaders(req.headers);
125 const client = new LemmyHttp(getHttpBaseInternal(), headers);
127 const { path, url, query } = req;
129 // Get site data first
130 // This bypasses errors, so that the client can hit the error on its own,
131 // in order to remove the jwt on the browser. Necessary for wrong jwts
132 let site: GetSiteResponse | undefined = undefined;
133 let routeData: any[] = [];
134 let errorPageData: ErrorPageData | undefined;
136 let try_site: any = await client.getSite(getSiteForm);
137 if (try_site.error == "not_logged_in") {
139 "Incorrect JWT token, skipping auth so frontend can remove jwt cookie"
141 getSiteForm.auth = undefined;
143 try_site = await client.getSite(getSiteForm);
146 if (!auth && isAuthPath(path)) {
147 res.redirect("/login");
152 initializeSite(site);
155 const initialFetchReq: InitialFetchRequest = {
163 if (activeRoute?.fetchInitialData) {
164 routeData = await Promise.all([
165 ...activeRoute.fetchInitialData(initialFetchReq),
170 errorPageData = getErrorPageData(error, site);
173 // Redirect to the 404 if there's an API error
174 if (routeData[0] && routeData[0].error) {
175 const error = routeData[0].error;
176 console.error(error);
177 if (error === "instance_is_private") {
178 return res.redirect(`/signup`);
180 errorPageData = getErrorPageData(error, site);
184 const isoData: IsoDataOptionalSite = {
192 <StaticRouter location={url} context={isoData}>
197 const root = renderToString(wrapper);
199 res.send(await createSsrHtml(root, isoData));
201 // If an error is caught here, the error page couldn't even be rendered
203 res.statusCode = 500;
205 process.env.NODE_ENV === "development" ? err.message : "Server error"
210 server.listen(Number(port), hostname, () => {
211 console.log(`http://${hostname}:${port}`);
214 function setForwardedHeaders(headers: IncomingHttpHeaders): {
215 [key: string]: string;
217 const out: { [key: string]: string } = {};
219 out.host = headers.host;
221 const realIp = headers["x-real-ip"];
223 out["x-real-ip"] = realIp as string;
225 const forwardedFor = headers["x-forwarded-for"];
227 out["x-forwarded-for"] = forwardedFor as string;
233 process.on("SIGINT", () => {
234 console.info("Interrupted");
238 const iconSizes = [72, 96, 128, 144, 152, 192, 384, 512];
239 const defaultLogoPathDirectory = path.join(
246 export async function generateManifestBase64(site: Site) {
248 process.env.NODE_ENV === "development"
249 ? "http://localhost:1236/"
251 ).replace(/\/$/g, "");
252 const icon = site.icon ? await fetchIconPng(site.icon) : null;
256 description: site.description ?? "A link aggregator for the fediverse",
259 display: "standalone",
261 background_color: "#222222",
262 theme_color: "#222222",
263 icons: await Promise.all(
264 iconSizes.map(async size => {
265 let src = await readFile(
266 path.join(defaultLogoPathDirectory, `icon-${size}x${size}.png`)
267 ).then(buf => buf.toString("base64"));
270 src = await sharp(icon)
274 .then(buf => buf.toString("base64"));
278 sizes: `${size}x${size}`,
280 src: `data:image/png;base64,${src}`,
281 purpose: "any maskable",
287 return Buffer.from(JSON.stringify(manifest)).toString("base64");
290 async function fetchIconPng(iconUrl: string) {
292 iconUrl.replace(/https?:\/\/[^\/]+/g, getHttpBaseInternal())
294 .then(res => res.blob())
295 .then(blob => blob.arrayBuffer());
298 function getErrorPageData(error: Error, site?: GetSiteResponse) {
299 const errorPageData: ErrorPageData = {};
302 errorPageData.error = error.message;
305 const adminMatrixIds = site?.admins
306 .map(({ person: { matrix_user_id } }) => matrix_user_id)
307 .filter(id => id) as string[] | undefined;
308 if (adminMatrixIds && adminMatrixIds.length > 0) {
309 errorPageData.adminMatrixIds = adminMatrixIds;
312 return errorPageData;
315 async function createSsrHtml(root: string, isoData: IsoDataOptionalSite) {
316 const site = isoData.site_res;
317 const appleTouchIcon = site?.site_view.site.icon
318 ? `data:image/png;base64,${sharp(
319 await fetchIconPng(site.site_view.site.icon)
327 background: "#222222",
331 .then(buf => buf.toString("base64"))}`
336 <script src="//cdn.jsdelivr.net/npm/eruda"></script>
337 <script>eruda.init();</script>
341 const erudaStr = process.env["LEMMY_UI_DEBUG"] ? renderToString(eruda) : "";
343 const helmet = Helmet.renderStatic();
345 const config: ILemmyConfig = { wsHost: process.env.LEMMY_UI_LEMMY_WS_HOST };
349 <html ${helmet.htmlAttributes.toString()}>
351 <script>window.isoData = ${sanitize(JSON.stringify(isoData))}</script>
352 <script>window.lemmyConfig = ${serialize(config)}</script>
354 <!-- A remote debugging utility for mobile -->
357 <!-- Custom injected script -->
360 ${helmet.title.toString()}
361 ${helmet.meta.toString()}
363 <!-- Required meta tags -->
364 <meta name="Description" content="Lemmy">
365 <meta charset="utf-8">
366 <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
371 href=${site?.site_view.site.icon ?? favIconUrl}
374 <!-- Web app manifest -->
379 href={${`data:application/manifest+json;base64,${await generateManifestBase64(
384 <link rel="apple-touch-icon" href=${appleTouchIcon} />
385 <link rel="apple-touch-startup-image" href=${appleTouchIcon} />
388 <link rel="stylesheet" type="text/css" href="/static/styles/styles.css" />
390 <!-- Current theme and more -->
391 ${helmet.link.toString()}
395 <body ${helmet.bodyAttributes.toString()}>
397 <div class="alert alert-danger rounded-0" role="alert">
398 <b>Javascript is disabled. Actions will not work.</b>
402 <div id='root'>${root}</div>
403 <script defer src='/static/js/client.js'></script>