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 { NODE_ENV } = process.env as Record<string, string>;
32 const server = express();
33 const [hostname, port] = process.env["LEMMY_UI_HOST"]
34 ? process.env["LEMMY_UI_HOST"].split(":")
35 : ["0.0.0.0", "1234"];
36 const extraThemesFolder =
37 process.env["LEMMY_UI_EXTRA_THEMES_FOLDER"] || "./extra_themes";
39 if (!process.env["LEMMY_UI_DISABLE_CSP"] && !process.env["LEMMY_UI_DEBUG"]) {
40 server.use(function (_req, res, next) {
42 "Content-Security-Policy",
43 `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 *`
48 const customHtmlHeader = process.env["LEMMY_UI_CUSTOM_HTML_HEADER"] || "";
50 server.use(express.json());
51 server.use(express.urlencoded({ extended: false }));
52 server.use("/static", express.static(path.resolve("./dist")));
54 const robotstxt = `User-Agent: *
57 Disallow: /create_community
58 Disallow: /create_post
59 Disallow: /create_private_message
63 Disallow: /password_change
67 server.get("/service-worker.js", async (_req, res) => {
68 res.setHeader("Content-Type", "application/javascript");
69 res.sendFile(path.resolve("./dist/service-worker.js"));
72 server.get("/robots.txt", async (_req, res) => {
73 res.setHeader("content-type", "text/plain; charset=utf-8");
77 server.get("/css/themes/:name", async (req, res) => {
78 res.contentType("text/css");
79 const theme = req.params.name;
80 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 promises: Promise<any>[] = [];
126 const headers = setForwardedHeaders(req.headers);
127 const client = new LemmyHttp(getHttpBaseInternal(), headers);
129 const { path, url, query } = req;
131 // Get site data first
132 // This bypasses errors, so that the client can hit the error on its own,
133 // in order to remove the jwt on the browser. Necessary for wrong jwts
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");
149 const site: GetSiteResponse = try_site;
150 initializeSite(site);
152 const initialFetchReq: InitialFetchRequest = {
160 if (activeRoute?.fetchInitialData) {
161 promises.push(...activeRoute.fetchInitialData(initialFetchReq));
164 let routeData = await Promise.all(promises);
165 // let routeData = [{ error: "I am an error, hear me roar!" } as any];
167 // Redirect to the 404 if there's an API error
168 if (routeData[0] && routeData[0].error) {
169 const error = routeData[0].error;
170 console.error(error);
171 if (error === "instance_is_private") {
172 return res.redirect(`/signup`);
174 const errorPageData: ErrorPageData = { type: "error" };
176 // Exact error should only be seen in a development environment. Users
177 // in production will get a more generic message.
178 if (NODE_ENV === "development") {
179 errorPageData.error = error;
182 const adminMatrixIds = site.admins
183 .map(({ person: { matrix_user_id } }) => matrix_user_id)
184 .filter(id => id) as string[];
185 if (adminMatrixIds.length > 0) {
186 errorPageData.adminMatrixIds = adminMatrixIds;
189 routeData = [errorPageData];
193 console.log(routeData);
195 const isoData: IsoData = {
202 <StaticRouter location={url} context={isoData}>
209 <script src="//cdn.jsdelivr.net/npm/eruda"></script>
210 <script>eruda.init();</script>
214 const erudaStr = process.env["LEMMY_UI_DEBUG"] ? renderToString(eruda) : "";
215 const root = renderToString(wrapper);
216 const helmet = Helmet.renderStatic();
218 const config: ILemmyConfig = { wsHost: process.env.LEMMY_UI_LEMMY_WS_HOST };
220 const appleTouchIcon = site.site_view.site.icon
221 ? `data:image/png;base64,${sharp(
222 await fetchIconPng(site.site_view.site.icon)
230 background: "#222222",
234 .then(buf => buf.toString("base64"))}`
239 <html ${helmet.htmlAttributes.toString()} lang="en">
241 <script>window.isoData = ${JSON.stringify(isoData)}</script>
242 <script>window.lemmyConfig = ${serialize(config)}</script>
244 <!-- A remote debugging utility for mobile -->
247 <!-- Custom injected script -->
250 ${helmet.title.toString()}
251 ${helmet.meta.toString()}
253 <!-- Required meta tags -->
254 <meta name="Description" content="Lemmy">
255 <meta charset="utf-8">
256 <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
261 href=${site.site_view.site.icon ?? favIconUrl}
264 <!-- Web app manifest -->
265 <link rel="manifest" href="data:application/manifest+json;base64,${await generateManifestBase64(
268 <link rel="apple-touch-icon" href=${appleTouchIcon} />
269 <link rel="apple-touch-startup-image" href=${appleTouchIcon} />
272 <link rel="stylesheet" type="text/css" href="/static/styles/styles.css" />
274 <!-- Current theme and more -->
275 ${helmet.link.toString()}
279 <body ${helmet.bodyAttributes.toString()}>
281 <div class="alert alert-danger rounded-0" role="alert">
282 <b>Javascript is disabled. Actions will not work.</b>
286 <div id='root'>${root}</div>
287 <script defer src='/static/js/client.js'></script>
293 res.statusCode = 500;
294 return res.send(NODE_ENV === "development" ? err.message : "Server error");
298 server.listen(Number(port), hostname, () => {
299 console.log(`http://${hostname}:${port}`);
302 function setForwardedHeaders(headers: IncomingHttpHeaders): {
303 [key: string]: string;
305 let out: { [key: string]: string } = {};
307 out.host = headers.host;
309 let realIp = headers["x-real-ip"];
311 out["x-real-ip"] = realIp as string;
313 let forwardedFor = headers["x-forwarded-for"];
315 out["x-forwarded-for"] = forwardedFor as string;
321 process.on("SIGINT", () => {
322 console.info("Interrupted");
326 const iconSizes = [72, 96, 128, 144, 152, 192, 384, 512];
327 const defaultLogoPathDirectory = path.join(
334 export async function generateManifestBase64(site: Site) {
336 process.env.NODE_ENV === "development"
337 ? "http://localhost:1236/"
339 ).replace(/\/$/g, "");
340 const icon = site.icon ? await fetchIconPng(site.icon) : null;
344 description: site.description ?? "A link aggregator for the fediverse",
347 display: "standalone",
349 background_color: "#222222",
350 theme_color: "#222222",
351 icons: await Promise.all(
352 iconSizes.map(async size => {
353 let src = await readFile(
354 path.join(defaultLogoPathDirectory, `icon-${size}x${size}.png`)
355 ).then(buf => buf.toString("base64"));
358 src = await sharp(icon)
362 .then(buf => buf.toString("base64"));
366 sizes: `${size}x${size}`,
368 src: `data:image/png;base64,${src}`,
369 purpose: "any maskable",
375 return Buffer.from(JSON.stringify(manifest)).toString("base64");
378 async function fetchIconPng(iconUrl: string) {
380 iconUrl.replace(/https?:\/\/localhost:\d+/g, getHttpBaseInternal())
382 .then(res => res.blob())
383 .then(blob => blob.arrayBuffer());