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 serialize from "serialize-javascript";
13 import sharp from "sharp";
14 import { App } from "../shared/components/app/app";
15 import { getHttpBase, getHttpBaseInternal } from "../shared/env";
20 } from "../shared/interfaces";
21 import { routes } from "../shared/routes";
28 } from "../shared/utils";
30 const server = express();
31 const [hostname, port] = process.env["LEMMY_UI_HOST"]
32 ? process.env["LEMMY_UI_HOST"].split(":")
33 : ["0.0.0.0", "1234"];
34 const extraThemesFolder =
35 process.env["LEMMY_UI_EXTRA_THEMES_FOLDER"] || "./extra_themes";
37 if (!process.env["LEMMY_UI_DISABLE_CSP"] && !process.env["LEMMY_UI_DEBUG"]) {
38 server.use(function (_req, res, next) {
40 "Content-Security-Policy",
41 `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 *`
46 const customHtmlHeader = process.env["LEMMY_UI_CUSTOM_HTML_HEADER"] || "";
48 server.use(express.json());
49 server.use(express.urlencoded({ extended: false }));
50 server.use("/static", express.static(path.resolve("./dist")));
52 const robotstxt = `User-Agent: *
55 Disallow: /create_community
56 Disallow: /create_post
57 Disallow: /create_private_message
61 Disallow: /password_change
65 server.get("/service-worker.js", async (_req, res) => {
66 res.setHeader("Content-Type", "application/javascript");
67 res.sendFile(path.resolve("./dist/service-worker.js"));
70 server.get("/robots.txt", async (_req, res) => {
71 res.setHeader("content-type", "text/plain; charset=utf-8");
75 server.get("/css/themes/:name", async (req, res) => {
76 res.contentType("text/css");
77 const theme = req.params.name;
78 if (!theme.endsWith(".css")) {
80 res.send("Theme must be a css file");
83 const customTheme = path.resolve(`./${extraThemesFolder}/${theme}`);
84 if (existsSync(customTheme)) {
85 res.sendFile(customTheme);
87 const internalTheme = path.resolve(`./dist/assets/css/themes/${theme}`);
89 // If the theme doesn't exist, just send litely
90 if (existsSync(internalTheme)) {
91 res.sendFile(internalTheme);
93 res.sendFile(path.resolve("./dist/assets/css/themes/litely.css"));
98 async function buildThemeList(): Promise<string[]> {
99 const themes = ["darkly", "darkly-red", "litely", "litely-red"];
100 if (existsSync(extraThemesFolder)) {
101 const dirThemes = await readdir(extraThemesFolder);
102 const cssThemes = dirThemes
103 .filter(d => d.endsWith(".css"))
104 .map(d => d.replace(".css", ""));
105 themes.push(...cssThemes);
110 server.get("/css/themelist", async (_req, res) => {
112 res.send(JSON.stringify(await buildThemeList()));
115 // server.use(cookieParser());
116 server.get("/*", async (req, res) => {
118 const activeRoute = routes.find(route => matchPath(req.path, route));
119 let auth: string | undefined = IsomorphicCookie.load("jwt", req);
121 const getSiteForm: GetSite = { auth };
123 const headers = setForwardedHeaders(req.headers);
124 const client = new LemmyHttp(getHttpBaseInternal(), headers);
126 const { path, url, query } = req;
128 // Get site data first
129 // This bypasses errors, so that the client can hit the error on its own,
130 // in order to remove the jwt on the browser. Necessary for wrong jwts
131 let site: GetSiteResponse | undefined = undefined;
132 let routeData: any[] = [];
134 let try_site: any = await client.getSite(getSiteForm);
135 if (try_site.error == "not_logged_in") {
137 "Incorrect JWT token, skipping auth so frontend can remove jwt cookie"
139 getSiteForm.auth = undefined;
141 try_site = await client.getSite(getSiteForm);
144 if (!auth && isAuthPath(path)) {
145 res.redirect("/login");
150 initializeSite(site);
153 const initialFetchReq: InitialFetchRequest = {
161 if (activeRoute?.fetchInitialData) {
162 routeData = await Promise.all([
163 ...activeRoute.fetchInitialData(initialFetchReq),
168 routeData = getErrorRouteData(error, site);
171 // Redirect to the 404 if there's an API error
172 if (routeData[0] && routeData[0].error) {
173 const error = routeData[0].error;
174 console.error(error);
175 if (error === "instance_is_private") {
176 return res.redirect(`/signup`);
178 routeData = getErrorRouteData(error, site);
182 const isoData: IsoDataOptionalSite = {
185 routeData: getErrorRouteData("lel", site),
189 <StaticRouter location={url} context={isoData}>
194 const root = renderToString(wrapper);
196 res.send(await createSsrHtml(root, isoData));
198 // If an error is caught here, the error page couldn't even be rendered
200 res.statusCode = 500;
202 process.env.NODE_ENV === "development" ? err.message : "Server error"
207 server.listen(Number(port), hostname, () => {
208 console.log(`http://${hostname}:${port}`);
211 function setForwardedHeaders(headers: IncomingHttpHeaders): {
212 [key: string]: string;
214 let out: { [key: string]: string } = {};
216 out.host = headers.host;
218 let realIp = headers["x-real-ip"];
220 out["x-real-ip"] = realIp as string;
222 let forwardedFor = headers["x-forwarded-for"];
224 out["x-forwarded-for"] = forwardedFor as string;
230 process.on("SIGINT", () => {
231 console.info("Interrupted");
235 const iconSizes = [72, 96, 128, 144, 152, 192, 384, 512];
236 const defaultLogoPathDirectory = path.join(
243 export async function generateManifestBase64(site: Site) {
245 process.env.NODE_ENV === "development"
246 ? "http://localhost:1236/"
248 ).replace(/\/$/g, "");
249 const icon = site.icon ? await fetchIconPng(site.icon) : null;
253 description: site.description ?? "A link aggregator for the fediverse",
256 display: "standalone",
258 background_color: "#222222",
259 theme_color: "#222222",
260 icons: await Promise.all(
261 iconSizes.map(async size => {
262 let src = await readFile(
263 path.join(defaultLogoPathDirectory, `icon-${size}x${size}.png`)
264 ).then(buf => buf.toString("base64"));
267 src = await sharp(icon)
271 .then(buf => buf.toString("base64"));
275 sizes: `${size}x${size}`,
277 src: `data:image/png;base64,${src}`,
278 purpose: "any maskable",
284 return Buffer.from(JSON.stringify(manifest)).toString("base64");
287 async function fetchIconPng(iconUrl: string) {
289 iconUrl.replace(/https?:\/\/localhost:\d+/g, getHttpBaseInternal())
291 .then(res => res.blob())
292 .then(blob => blob.arrayBuffer());
295 function getErrorRouteData(error: string, site?: GetSiteResponse) {
296 const errorPageData: ErrorPageData = { type: "error" };
298 console.log(`Error: ${process.env.NODE_ENV}`);
300 // Exact error should only be seen in a development environment. Users
301 // in production will get a more generic message.
302 if (process.env.NODE_ENV === "development") {
303 errorPageData.error = error;
306 const adminMatrixIds = site?.admins
307 .map(({ person: { matrix_user_id } }) => matrix_user_id)
308 .filter(id => id) as string[] | undefined;
309 if (adminMatrixIds && adminMatrixIds.length > 0) {
310 errorPageData.adminMatrixIds = adminMatrixIds;
313 return [errorPageData];
316 async function createSsrHtml(root: string, isoData: IsoDataOptionalSite) {
317 const site = isoData.site_res;
318 const appleTouchIcon = site?.site_view.site.icon
319 ? `data:image/png;base64,${sharp(
320 await fetchIconPng(site.site_view.site.icon)
328 background: "#222222",
332 .then(buf => buf.toString("base64"))}`
337 <script src="//cdn.jsdelivr.net/npm/eruda"></script>
338 <script>eruda.init();</script>
342 const erudaStr = process.env["LEMMY_UI_DEBUG"] ? renderToString(eruda) : "";
344 const helmet = Helmet.renderStatic();
346 const config: ILemmyConfig = { wsHost: process.env.LEMMY_UI_LEMMY_WS_HOST };
350 <html ${helmet.htmlAttributes.toString()} lang="en">
352 <script>window.isoData = ${JSON.stringify(isoData)}</script>
353 <script>window.lemmyConfig = ${serialize(config)}</script>
355 <!-- A remote debugging utility for mobile -->
358 <!-- Custom injected script -->
361 ${helmet.title.toString()}
362 ${helmet.meta.toString()}
364 <!-- Required meta tags -->
365 <meta name="Description" content="Lemmy">
366 <meta charset="utf-8">
367 <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
372 href=${site?.site_view.site.icon ?? favIconUrl}
375 <!-- Web app manifest -->
380 href={${`data:application/manifest+json;base64,${await generateManifestBase64(
385 <link rel="apple-touch-icon" href=${appleTouchIcon} />
386 <link rel="apple-touch-startup-image" href=${appleTouchIcon} />
389 <link rel="stylesheet" type="text/css" href="/static/styles/styles.css" />
391 <!-- Current theme and more -->
392 ${helmet.link.toString()}
396 <body ${helmet.bodyAttributes.toString()}>
398 <div class="alert alert-danger rounded-0" role="alert">
399 <b>Javascript is disabled. Actions will not work.</b>
403 <div id='root'>${root}</div>
404 <script defer src='/static/js/client.js'></script>