src/server/index.tsx

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