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";
26 } from "../shared/services/HttpService";
33 } from "../shared/utils";
35 const server = express();
36 const [hostname, port] = process.env["LEMMY_UI_HOST"]
37 ? process.env["LEMMY_UI_HOST"].split(":")
38 : ["0.0.0.0", "1234"];
39 const extraThemesFolder =
40 process.env["LEMMY_UI_EXTRA_THEMES_FOLDER"] || "./extra_themes";
42 if (!process.env["LEMMY_UI_DISABLE_CSP"] && !process.env["LEMMY_UI_DEBUG"]) {
43 server.use(function (_req, res, next) {
45 "Content-Security-Policy",
46 `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 *`
51 const customHtmlHeader = process.env["LEMMY_UI_CUSTOM_HTML_HEADER"] || "";
53 server.use(express.json());
54 server.use(express.urlencoded({ extended: false }));
55 server.use("/static", express.static(path.resolve("./dist")));
57 const robotstxt = `User-Agent: *
60 Disallow: /create_community
61 Disallow: /create_post
62 Disallow: /create_private_message
66 Disallow: /password_change
70 server.get("/service-worker.js", async (_req, res) => {
71 res.setHeader("Content-Type", "application/javascript");
74 `./dist/service-worker${
75 process.env.NODE_ENV === "development" ? "-development" : ""
81 server.get("/robots.txt", async (_req, res) => {
82 res.setHeader("content-type", "text/plain; charset=utf-8");
86 server.get("/css/themes/:name", async (req, res) => {
87 res.contentType("text/css");
88 const theme = req.params.name;
89 if (!theme.endsWith(".css")) {
91 res.send("Theme must be a css file");
94 const customTheme = path.resolve(`./${extraThemesFolder}/${theme}`);
95 if (existsSync(customTheme)) {
96 res.sendFile(customTheme);
98 const internalTheme = path.resolve(`./dist/assets/css/themes/${theme}`);
100 // If the theme doesn't exist, just send litely
101 if (existsSync(internalTheme)) {
102 res.sendFile(internalTheme);
104 res.sendFile(path.resolve("./dist/assets/css/themes/litely.css"));
109 async function buildThemeList(): Promise<string[]> {
110 const themes = ["darkly", "darkly-red", "litely", "litely-red"];
111 if (existsSync(extraThemesFolder)) {
112 const dirThemes = await readdir(extraThemesFolder);
113 const cssThemes = dirThemes
114 .filter(d => d.endsWith(".css"))
115 .map(d => d.replace(".css", ""));
116 themes.push(...cssThemes);
121 server.get("/css/themelist", async (_req, res) => {
123 res.send(JSON.stringify(await buildThemeList()));
126 // server.use(cookieParser());
127 server.get("/*", async (req, res) => {
129 const activeRoute = routes.find(route => matchPath(req.path, route));
130 let auth: string | undefined = IsomorphicCookie.load("jwt", req);
132 const getSiteForm: GetSite = { auth };
134 const headers = setForwardedHeaders(req.headers);
135 const client = wrapClient(new LemmyHttp(getHttpBaseInternal(), headers));
137 const { path, url, query } = req;
139 // Get site data first
140 // This bypasses errors, so that the client can hit the error on its own,
141 // in order to remove the jwt on the browser. Necessary for wrong jwts
142 let site: GetSiteResponse | undefined = undefined;
143 let routeData: Record<string, RequestState<any>> = {};
144 let errorPageData: ErrorPageData | undefined = undefined;
145 let try_site = await client.getSite(getSiteForm);
146 if (try_site.state === "failed" && try_site.msg == "not_logged_in") {
148 "Incorrect JWT token, skipping auth so frontend can remove jwt cookie"
150 getSiteForm.auth = undefined;
152 try_site = await client.getSite(getSiteForm);
155 if (!auth && isAuthPath(path)) {
156 return res.redirect("/login");
159 if (try_site.state === "success") {
160 site = try_site.data;
161 initializeSite(site);
163 if (path != "/setup" && !site.site_view.local_site.site_setup) {
164 return res.redirect("/setup");
168 const initialFetchReq: InitialFetchRequest = {
176 if (activeRoute?.fetchInitialData) {
177 const routeDataKeysAndVals = await Promise.all(
178 Object.entries(activeRoute.fetchInitialData(initialFetchReq)).map(
179 async ([key, val]) => [key, await val]
183 routeData = routeDataKeysAndVals.reduce((acc, [key, val]) => {
190 } else if (try_site.state === "failed") {
191 errorPageData = getErrorPageData(new Error(try_site.msg), site);
194 const error = Object.values(routeData).find(
195 res => res.state === "failed"
196 ) as FailedRequestState | undefined;
198 // Redirect to the 404 if there's an API error
200 console.error(error.msg);
201 if (error.msg === "instance_is_private") {
202 return res.redirect(`/signup`);
204 errorPageData = getErrorPageData(new Error(error.msg), site);
208 const isoData: IsoDataOptionalSite = {
216 <StaticRouter location={url} context={isoData}>
221 const root = renderToString(wrapper);
223 res.send(await createSsrHtml(root, isoData));
225 // If an error is caught here, the error page couldn't even be rendered
227 res.statusCode = 500;
229 process.env.NODE_ENV === "development" ? err.message : "Server error"
234 server.listen(Number(port), hostname, () => {
235 console.log(`http://${hostname}:${port}`);
238 function setForwardedHeaders(headers: IncomingHttpHeaders): {
239 [key: string]: string;
241 const out: { [key: string]: string } = {};
243 out.host = headers.host;
245 const realIp = headers["x-real-ip"];
247 out["x-real-ip"] = realIp as string;
249 const forwardedFor = headers["x-forwarded-for"];
251 out["x-forwarded-for"] = forwardedFor as string;
257 process.on("SIGINT", () => {
258 console.info("Interrupted");
262 const iconSizes = [72, 96, 144, 192, 512];
263 const defaultLogoPathDirectory = path.join(
270 export async function generateManifestBase64({
274 local_site: { community_creation_admin_only },
276 }: GetSiteResponse) {
277 const url = getHttpBaseExternal();
279 const icon = site.icon ? await fetchIconPng(site.icon) : null;
283 description: site.description ?? "A link aggregator for the fediverse",
286 display: "standalone",
288 background_color: "#222222",
289 theme_color: "#222222",
290 icons: await Promise.all(
291 iconSizes.map(async size => {
292 let src = await readFile(
293 path.join(defaultLogoPathDirectory, `icon-${size}x${size}.png`)
294 ).then(buf => buf.toString("base64"));
297 src = await sharp(icon)
301 .then(buf => buf.toString("base64"));
305 sizes: `${size}x${size}`,
307 src: `data:image/png;base64,${src}`,
308 purpose: "any maskable",
315 short_name: "Search",
316 description: "Perform a search.",
322 short_name: "Communities",
323 description: "Browse communities",
332 short_name: "Create Post",
333 description: "Create a post.",
339 my_user?.local_user_view.person.admin || !community_creation_admin_only
342 name: "Create Community",
343 url: "/create_community",
344 short_name: "Create Community",
345 description: "Create a community",
350 related_applications: [
353 url: "https://f-droid.org/packages/com.jerboa/",
359 return Buffer.from(JSON.stringify(manifest)).toString("base64");
362 async function fetchIconPng(iconUrl: string) {
363 return await fetch(iconUrl)
364 .then(res => res.blob())
365 .then(blob => blob.arrayBuffer());
368 function getErrorPageData(error: Error, site?: GetSiteResponse) {
369 const errorPageData: ErrorPageData = {};
372 errorPageData.error = error.message;
375 const adminMatrixIds = site?.admins
376 .map(({ person: { matrix_user_id } }) => matrix_user_id)
377 .filter(id => id) as string[] | undefined;
378 if (adminMatrixIds && adminMatrixIds.length > 0) {
379 errorPageData.adminMatrixIds = adminMatrixIds;
382 return errorPageData;
385 async function createSsrHtml(root: string, isoData: IsoDataOptionalSite) {
386 const site = isoData.site_res;
387 const appleTouchIcon = site?.site_view.site.icon
388 ? `data:image/png;base64,${sharp(
389 await fetchIconPng(site.site_view.site.icon)
397 background: "#222222",
401 .then(buf => buf.toString("base64"))}`
405 process.env["LEMMY_UI_DEBUG"] === "true"
408 <script src="//cdn.jsdelivr.net/npm/eruda"></script>
409 <script>eruda.init();</script>
414 const helmet = Helmet.renderStatic();
416 const config: ILemmyConfig = { wsHost: process.env.LEMMY_UI_LEMMY_WS_HOST };
420 <html ${helmet.htmlAttributes.toString()}>
422 <script>window.isoData = ${serialize(isoData)}</script>
423 <script>window.lemmyConfig = ${serialize(config)}</script>
425 <!-- A remote debugging utility for mobile -->
428 <!-- Custom injected script -->
431 ${helmet.title.toString()}
432 ${helmet.meta.toString()}
434 <!-- Required meta tags -->
435 <meta name="Description" content="Lemmy">
436 <meta charset="utf-8">
437 <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
442 href=${site?.site_view.site.icon ?? favIconUrl}
445 <!-- Web app manifest -->
450 href=${`data:application/manifest+json;base64,${await generateManifestBase64(
455 <link rel="apple-touch-icon" href=${appleTouchIcon} />
456 <link rel="apple-touch-startup-image" href=${appleTouchIcon} />
459 <link rel="stylesheet" type="text/css" href="/static/styles/styles.css" />
461 <!-- Current theme and more -->
462 ${helmet.link.toString()}
466 <body ${helmet.bodyAttributes.toString()}>
468 <div class="alert alert-danger rounded-0" role="alert">
469 <b>Javascript is disabled. Actions will not work.</b>
473 <div id='root'>${root}</div>
474 <script defer src='/static/js/client.js'></script>