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 } 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 { getHttpBaseExternal, getHttpBaseInternal } from "../shared/env";
20 } from "../shared/interfaces";
21 import { routes } from "../shared/routes";
22 import { RequestState, wrapClient } from "../shared/services/HttpService";
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");
70 `./dist/service-worker${
71 process.env.NODE_ENV === "development" ? "-development" : ""
77 server.get("/robots.txt", async (_req, res) => {
78 res.setHeader("content-type", "text/plain; charset=utf-8");
82 server.get("/css/themes/:name", async (req, res) => {
83 res.contentType("text/css");
84 const theme = req.params.name;
85 if (!theme.endsWith(".css")) {
87 res.send("Theme must be a css file");
90 const customTheme = path.resolve(`./${extraThemesFolder}/${theme}`);
91 if (existsSync(customTheme)) {
92 res.sendFile(customTheme);
94 const internalTheme = path.resolve(`./dist/assets/css/themes/${theme}`);
96 // If the theme doesn't exist, just send litely
97 if (existsSync(internalTheme)) {
98 res.sendFile(internalTheme);
100 res.sendFile(path.resolve("./dist/assets/css/themes/litely.css"));
105 async function buildThemeList(): Promise<string[]> {
106 const themes = ["darkly", "darkly-red", "litely", "litely-red"];
107 if (existsSync(extraThemesFolder)) {
108 const dirThemes = await readdir(extraThemesFolder);
109 const cssThemes = dirThemes
110 .filter(d => d.endsWith(".css"))
111 .map(d => d.replace(".css", ""));
112 themes.push(...cssThemes);
117 server.get("/css/themelist", async (_req, res) => {
119 res.send(JSON.stringify(await buildThemeList()));
122 // server.use(cookieParser());
123 server.get("/*", async (req, res) => {
125 const activeRoute = routes.find(route => matchPath(req.path, route));
126 let auth: string | undefined = IsomorphicCookie.load("jwt", req);
128 const getSiteForm: GetSite = { auth };
130 const headers = setForwardedHeaders(req.headers);
131 const client = wrapClient(new LemmyHttp(getHttpBaseInternal(), headers));
133 const { path, url, query } = req;
135 // Get site data first
136 // This bypasses errors, so that the client can hit the error on its own,
137 // in order to remove the jwt on the browser. Necessary for wrong jwts
138 let site: GetSiteResponse | undefined = undefined;
139 const routeData: RequestState<any>[] = [];
140 let errorPageData: ErrorPageData | undefined = undefined;
141 let try_site = await client.getSite(getSiteForm);
142 if (try_site.state === "failed" && try_site.msg == "not_logged_in") {
144 "Incorrect JWT token, skipping auth so frontend can remove jwt cookie"
146 getSiteForm.auth = undefined;
148 try_site = await client.getSite(getSiteForm);
151 if (!auth && isAuthPath(path)) {
152 return res.redirect("/login");
155 if (try_site.state === "success") {
156 site = try_site.data;
157 initializeSite(site);
159 if (path != "/setup" && !site.site_view.local_site.site_setup) {
160 return res.redirect("/setup");
164 const initialFetchReq: InitialFetchRequest = {
172 if (activeRoute?.fetchInitialData) {
174 ...(await Promise.all([
175 ...activeRoute.fetchInitialData(initialFetchReq),
180 } else if (try_site.state === "failed") {
181 errorPageData = getErrorPageData(new Error(try_site.msg), site);
184 // Redirect to the 404 if there's an API error
185 if (routeData[0] && routeData[0].state === "failed") {
186 const error = routeData[0].msg;
187 console.error(error);
188 if (error === "instance_is_private") {
189 return res.redirect(`/signup`);
191 errorPageData = getErrorPageData(new Error(error), site);
195 const isoData: IsoDataOptionalSite = {
203 <StaticRouter location={url} context={isoData}>
208 const root = renderToString(wrapper);
210 res.send(await createSsrHtml(root, isoData));
212 // If an error is caught here, the error page couldn't even be rendered
214 res.statusCode = 500;
216 process.env.NODE_ENV === "development" ? err.message : "Server error"
221 server.listen(Number(port), hostname, () => {
222 console.log(`http://${hostname}:${port}`);
225 function setForwardedHeaders(headers: IncomingHttpHeaders): {
226 [key: string]: string;
228 const out: { [key: string]: string } = {};
230 out.host = headers.host;
232 const realIp = headers["x-real-ip"];
234 out["x-real-ip"] = realIp as string;
236 const forwardedFor = headers["x-forwarded-for"];
238 out["x-forwarded-for"] = forwardedFor as string;
244 process.on("SIGINT", () => {
245 console.info("Interrupted");
249 const iconSizes = [72, 96, 144, 192, 512];
250 const defaultLogoPathDirectory = path.join(
257 export async function generateManifestBase64({
261 local_site: { community_creation_admin_only },
263 }: GetSiteResponse) {
264 const url = getHttpBaseExternal();
266 const icon = site.icon ? await fetchIconPng(site.icon) : null;
270 description: site.description ?? "A link aggregator for the fediverse",
273 display: "standalone",
275 background_color: "#222222",
276 theme_color: "#222222",
277 icons: await Promise.all(
278 iconSizes.map(async size => {
279 let src = await readFile(
280 path.join(defaultLogoPathDirectory, `icon-${size}x${size}.png`)
281 ).then(buf => buf.toString("base64"));
284 src = await sharp(icon)
288 .then(buf => buf.toString("base64"));
292 sizes: `${size}x${size}`,
294 src: `data:image/png;base64,${src}`,
295 purpose: "any maskable",
302 short_name: "Search",
303 description: "Perform a search.",
309 short_name: "Communities",
310 description: "Browse communities",
319 short_name: "Create Post",
320 description: "Create a post.",
326 my_user?.local_user_view.person.admin || !community_creation_admin_only
329 name: "Create Community",
330 url: "/create_community",
331 short_name: "Create Community",
332 description: "Create a community",
337 related_applications: [
340 url: "https://f-droid.org/packages/com.jerboa/",
346 return Buffer.from(JSON.stringify(manifest)).toString("base64");
349 async function fetchIconPng(iconUrl: string) {
350 return await fetch(iconUrl)
351 .then(res => res.blob())
352 .then(blob => blob.arrayBuffer());
355 function getErrorPageData(error: Error, site?: GetSiteResponse) {
356 const errorPageData: ErrorPageData = {};
359 errorPageData.error = error.message;
362 const adminMatrixIds = site?.admins
363 .map(({ person: { matrix_user_id } }) => matrix_user_id)
364 .filter(id => id) as string[] | undefined;
365 if (adminMatrixIds && adminMatrixIds.length > 0) {
366 errorPageData.adminMatrixIds = adminMatrixIds;
369 return errorPageData;
372 async function createSsrHtml(root: string, isoData: IsoDataOptionalSite) {
373 const site = isoData.site_res;
374 const appleTouchIcon = site?.site_view.site.icon
375 ? `data:image/png;base64,${sharp(
376 await fetchIconPng(site.site_view.site.icon)
384 background: "#222222",
388 .then(buf => buf.toString("base64"))}`
392 process.env["LEMMY_UI_DEBUG"] === "true"
395 <script src="//cdn.jsdelivr.net/npm/eruda"></script>
396 <script>eruda.init();</script>
401 const helmet = Helmet.renderStatic();
403 const config: ILemmyConfig = { wsHost: process.env.LEMMY_UI_LEMMY_WS_HOST };
407 <html ${helmet.htmlAttributes.toString()}>
409 <script>window.isoData = ${serialize(isoData)}</script>
410 <script>window.lemmyConfig = ${serialize(config)}</script>
412 <!-- A remote debugging utility for mobile -->
415 <!-- Custom injected script -->
418 ${helmet.title.toString()}
419 ${helmet.meta.toString()}
421 <!-- Required meta tags -->
422 <meta name="Description" content="Lemmy">
423 <meta charset="utf-8">
424 <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
429 href=${site?.site_view.site.icon ?? favIconUrl}
432 <!-- Web app manifest -->
437 href=${`data:application/manifest+json;base64,${await generateManifestBase64(
442 <link rel="apple-touch-icon" href=${appleTouchIcon} />
443 <link rel="apple-touch-startup-image" href=${appleTouchIcon} />
446 <link rel="stylesheet" type="text/css" href="/static/styles/styles.css" />
448 <!-- Current theme and more -->
449 ${helmet.link.toString()}
453 <body ${helmet.bodyAttributes.toString()}>
455 <div class="alert alert-danger rounded-0" role="alert">
456 <b>Javascript is disabled. Actions will not work.</b>
460 <div id='root'>${root}</div>
461 <script defer src='/static/js/client.js'></script>