src/server/index.tsx

   1 import express from "express";
   2 import fs from "fs";
   3 import { IncomingHttpHeaders } from "http";
   4 import { Helmet } from "inferno-helmet";
   5 import { matchPath, StaticRouter } from "inferno-router";
   6 import { renderToString } from "inferno-server";
   7 import IsomorphicCookie from "isomorphic-cookie";
   8 import { GetSite, GetSiteResponse, LemmyHttp } from "lemmy-js-client";
   9 import path from "path";
  10 import process from "process";
  11 import serialize from "serialize-javascript";
  12 import { App } from "../shared/components/app/app";
  13 import { SYMBOLS } from "../shared/components/common/symbols";
  14 import { httpBaseInternal } from "../shared/env";
  15 import {
  16   ILemmyConfig,
  17   InitialFetchRequest,
  18   IsoData,
  19 } from "../shared/interfaces";
  20 import { routes } from "../shared/routes";
  21 import { initializeSite, setOptionalAuth } from "../shared/utils";
  22
  23 const server = express();
  24 const [hostname, port] = process.env["LEMMY_UI_HOST"]
  25   ? process.env["LEMMY_UI_HOST"].split(":")
  26   : ["0.0.0.0", "1234"];
  27 const extraThemesFolder =
  28   process.env["LEMMY_UI_EXTRA_THEMES_FOLDER"] || "./extra_themes";
  29
  30 server.use(function (_req, res, next) {
  31   res.setHeader(
  32     "Content-Security-Policy",
  33     "default-src data: 'self'; connect-src * ws: wss:; frame-src *; img-src * data:; script-src 'self'; style-src 'self' 'unsafe-inline'; manifest-src 'self'"
  34   );
  35   next();
  36 });
  37 server.use(express.json());
  38 server.use(express.urlencoded({ extended: false }));
  39 server.use("/static", express.static(path.resolve("./dist")));
  40
  41 const robotstxt = `User-Agent: *
  42 Disallow: /login
  43 Disallow: /settings
  44 Disallow: /create_community
  45 Disallow: /create_post
  46 Disallow: /create_private_message
  47 Disallow: /inbox
  48 Disallow: /setup
  49 Disallow: /admin
  50 Disallow: /password_change
  51 Disallow: /search/
  52 `;
  53
  54 server.get("/robots.txt", async (_req, res) => {
  55   res.setHeader("content-type", "text/plain; charset=utf-8");
  56   res.send(robotstxt);
  57 });
  58
  59 server.get("/css/themes/:name", async (req, res) => {
  60   res.contentType("text/css");
  61   const theme = req.params.name;
  62   if (!theme.endsWith(".css")) {
  63     res.send("Theme must be a css file");
  64   }
  65
  66   const customTheme = path.resolve(`./${extraThemesFolder}/${theme}`);
  67   if (fs.existsSync(customTheme)) {
  68     res.sendFile(customTheme);
  69   } else {
  70     const internalTheme = path.resolve(`./dist/assets/css/themes/${theme}`);
  71     res.sendFile(internalTheme);
  72   }
  73 });
  74
  75 function buildThemeList(): string[] {
  76   let themes = [
  77     "litera",
  78     "materia",
  79     "minty",
  80     "solar",
  81     "united",
  82     "cyborg",
  83     "darkly",
  84     "journal",
  85     "sketchy",
  86     "vaporwave",
  87     "vaporwave-dark",
  88     "i386",
  89     "litely",
  90     "nord",
  91   ];
  92   if (fs.existsSync(extraThemesFolder)) {
  93     let dirThemes = fs.readdirSync(extraThemesFolder);
  94     let cssThemes = dirThemes
  95       .filter(d => d.endsWith(".css"))
  96       .map(d => d.replace(".css", ""));
  97     themes.push(...cssThemes);
  98   }
  99   return themes;
 100 }
 101
 102 server.get("/css/themelist", async (_req, res) => {
 103   res.type("json");
 104   res.send(JSON.stringify(buildThemeList()));
 105 });
 106
 107 // server.use(cookieParser());
 108 server.get("/*", async (req, res) => {
 109   try {
 110     const activeRoute = routes.find(route => matchPath(req.path, route)) || {};
 111     const context = {} as any;
 112     let auth: string = IsomorphicCookie.load("jwt", req);
 113
 114     let getSiteForm: GetSite = {};
 115     setOptionalAuth(getSiteForm, auth);
 116
 117     let promises: Promise<any>[] = [];
 118
 119     let headers = setForwardedHeaders(req.headers);
 120
 121     let initialFetchReq: InitialFetchRequest = {
 122       client: new LemmyHttp(httpBaseInternal, headers),
 123       auth,
 124       path: req.path,
 125     };
 126
 127     // Get site data first
 128     // This bypasses errors, so that the client can hit the error on its own,
 129     // in order to remove the jwt on the browser. Necessary for wrong jwts
 130     let try_site: any = await initialFetchReq.client.getSite(getSiteForm);
 131     if (try_site.error == "not_logged_in") {
 132       console.error(
 133         "Incorrect JWT token, skipping auth so frontend can remove jwt cookie"
 134       );
 135       delete getSiteForm.auth;
 136       delete initialFetchReq.auth;
 137       try_site = await initialFetchReq.client.getSite(getSiteForm);
 138     }
 139     let site: GetSiteResponse = try_site;
 140     initializeSite(site);
 141
 142     if (activeRoute.fetchInitialData) {
 143       promises.push(...activeRoute.fetchInitialData(initialFetchReq));
 144     }
 145
 146     let routeData = await Promise.all(promises);
 147
 148     // Redirect to the 404 if there's an API error
 149     if (routeData[0] && routeData[0].error) {
 150       let errCode = routeData[0].error;
 151       console.error(errCode);
 152       if (errCode == "instance_is_private") {
 153         return res.redirect(`/signup`);
 154       } else {
 155         return res.send(`404: ${removeAuthParam(errCode)}`);
 156       }
 157     }
 158
 159     let isoData: IsoData = {
 160       path: req.path,
 161       site_res: site,
 162       routeData,
 163     };
 164
 165     const wrapper = (
 166       <StaticRouter location={req.url} context={isoData}>
 167         <App siteRes={isoData.site_res} />
 168       </StaticRouter>
 169     );
 170     if (context.url) {
 171       return res.redirect(context.url);
 172     }
 173
 174     const root = renderToString(wrapper);
 175     const symbols = renderToString(SYMBOLS);
 176     const helmet = Helmet.renderStatic();
 177
 178     const config: ILemmyConfig = { wsHost: process.env.LEMMY_WS_HOST };
 179
 180     res.send(`
 181            <!DOCTYPE html>
 182            <html ${helmet.htmlAttributes.toString()} lang="en">
 183            <head>
 184            <script>window.isoData = ${serialize(isoData)}</script>
 185            <script>window.lemmyConfig = ${serialize(config)}</script>
 186
 187            <!-- A remote debugging utility for mobile
 188            <script src="//cdn.jsdelivr.net/npm/eruda"></script>
 189            <script>eruda.init();</script>
 190            -->
 191
 192            ${helmet.title.toString()}
 193            ${helmet.meta.toString()}
 194
 195            <!-- Required meta tags -->
 196            <meta name="Description" content="Lemmy">
 197            <meta charset="utf-8">
 198            <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
 199
 200            <!-- Web app manifest -->
 201            <link rel="manifest" href="/static/assets/manifest.webmanifest">
 202
 203            <!-- Styles -->
 204            <link rel="stylesheet" type="text/css" href="/static/styles/styles.css" />
 205
 206            <!-- Current theme and more -->
 207            ${helmet.link.toString()}
 208
 209            <!-- Icons -->
 210            ${symbols}
 211
 212            </head>
 213
 214            <body ${helmet.bodyAttributes.toString()}>
 215              <noscript>
 216                <div class="alert alert-danger rounded-0" role="alert">
 217                  <b>Javascript is disabled. Actions will not work.</b>
 218                </div>
 219              </noscript>
 220
 221              <div id='root'>${root}</div>
 222              <script defer src='/static/js/client.js'></script>
 223            </body>
 224          </html>
 225 `);
 226   } catch (err) {
 227     console.error(err);
 228     return res.send(`404: ${removeAuthParam(err)}`);
 229   }
 230 });
 231
 232 server.listen(Number(port), hostname, () => {
 233   console.log(`http://${hostname}:${port}`);
 234 });
 235
 236 function setForwardedHeaders(headers: IncomingHttpHeaders): {
 237   [key: string]: string;
 238 } {
 239   let out = {
 240     host: headers.host,
 241   };
 242   if (headers["x-real-ip"]) {
 243     out["x-real-ip"] = headers["x-real-ip"];
 244   }
 245   if (headers["x-forwarded-for"]) {
 246     out["x-forwarded-for"] = headers["x-forwarded-for"];
 247   }
 248
 249   return out;
 250 }
 251
 252 process.on("SIGINT", () => {
 253   console.info("Interrupted");
 254   process.exit(0);
 255 });
 256
 257 function removeAuthParam(err: any): string {
 258   return removeParam(err.toString(), "auth");
 259 }
 260
 261 function removeParam(url: string, parameter: string): string {
 262   return url
 263     .replace(new RegExp("[?&]" + parameter + "=[^&#]*(#.*)?$"), "$1")
 264     .replace(new RegExp("([?&])" + parameter + "=[^&]*&"), "$1");
 265 }