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   const activeRoute = routes.find(route => matchPath(req.path, route)) || {};
  52   const context = {} as any;
  53   let auth: string = IsomorphicCookie.load("jwt", req);
  54
  55   let getSiteForm: GetSite = {};
  56   setOptionalAuth(getSiteForm, auth);
  57
  58   let promises: Promise<any>[] = [];
  59
  60   let headers = setForwardedHeaders(req.headers);
  61
  62   let initialFetchReq: InitialFetchRequest = {
  63     client: new LemmyHttp(httpBaseInternal, headers),
  64     auth,
  65     path: req.path,
  66   };
  67
  68   // Get site data first
  69   // This bypasses errors, so that the client can hit the error on its own,
  70   // in order to remove the jwt on the browser. Necessary for wrong jwts
  71   let try_site: any = await initialFetchReq.client.getSite(getSiteForm);
  72   if (try_site.error == "not_logged_in") {
  73     console.error(
  74       "Incorrect JWT token, skipping auth so frontend can remove jwt cookie"
  75     );
  76     delete getSiteForm.auth;
  77     delete initialFetchReq.auth;
  78     try_site = await initialFetchReq.client.getSite(getSiteForm);
  79   }
  80   let site: GetSiteResponse = try_site;
  81   initializeSite(site);
  82
  83   if (activeRoute.fetchInitialData) {
  84     promises.push(...activeRoute.fetchInitialData(initialFetchReq));
  85   }
  86
  87   let routeData = await Promise.all(promises);
  88
  89   // Redirect to the 404 if there's an API error
  90   if (routeData[0] && routeData[0].error) {
  91     let errCode = routeData[0].error;
  92     return res.redirect(`/404?err=${errCode}`);
  93   }
  94
  95   let isoData: IsoData = {
  96     path: req.path,
  97     site_res: site,
  98     routeData,
  99   };
 100
 101   const wrapper = (
 102     <StaticRouter location={req.url} context={isoData}>
 103       <App siteRes={isoData.site_res} />
 104     </StaticRouter>
 105   );
 106   if (context.url) {
 107     return res.redirect(context.url);
 108   }
 109
 110   const cspHtml = (
 111     <meta
 112       http-equiv="Content-Security-Policy"
 113       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'"
 114     />
 115   );
 116
 117   const root = renderToString(wrapper);
 118   const symbols = renderToString(SYMBOLS);
 119   const cspStr = process.env.LEMMY_EXTERNAL_HOST ? renderToString(cspHtml) : "";
 120   const helmet = Helmet.renderStatic();
 121
 122   const config: ILemmyConfig = { wsHost: process.env.LEMMY_WS_HOST };
 123
 124   res.send(`
 125            <!DOCTYPE html>
 126            <html ${helmet.htmlAttributes.toString()} lang="en">
 127            <head>
 128            <script>window.isoData = ${serialize(isoData)}</script>
 129            <script>window.lemmyConfig = ${serialize(config)}</script>
 130
 131            <!-- A remote debugging utility for mobile
 132            <script src="//cdn.jsdelivr.net/npm/eruda"></script>
 133            <script>eruda.init();</script>
 134            -->
 135
 136            ${helmet.title.toString()}
 137            ${helmet.meta.toString()}
 138
 139            <!-- Required meta tags -->
 140            <meta name="Description" content="Lemmy">
 141            <meta charset="utf-8">
 142            <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
 143
 144            <!-- Content Security Policy -->
 145            ${cspStr}
 146
 147            <!-- Web app manifest -->
 148            <link rel="manifest" href="/static/assets/manifest.webmanifest">
 149
 150            <!-- Styles -->
 151            <link rel="stylesheet" type="text/css" href="/static/styles/styles.css" />
 152
 153            <!-- Current theme and more -->
 154            ${helmet.link.toString()}
 155
 156            <!-- Icons -->
 157            ${symbols}
 158
 159            </head>
 160
 161            <body ${helmet.bodyAttributes.toString()}>
 162              <noscript>
 163                <div class="alert alert-danger rounded-0" role="alert">
 164                  <b>Javascript is disabled. Actions will not work.</b>
 165                </div>
 166              </noscript>
 167
 168              <div id='root'>${root}</div>
 169              <script defer src='/static/js/client.js'></script>
 170            </body>
 171          </html>
 172 `);
 173 });
 174
 175 server.listen(Number(port), hostname, () => {
 176   console.log(`http://${hostname}:${port}`);
 177 });
 178
 179 function setForwardedHeaders(headers: IncomingHttpHeaders): {
 180   [key: string]: string;
 181 } {
 182   let out = {
 183     host: headers.host,
 184   };
 185   if (headers["x-real-ip"]) {
 186     out["x-real-ip"] = headers["x-real-ip"];
 187   }
 188   if (headers["x-forwarded-for"]) {
 189     out["x-forwarded-for"] = headers["x-forwarded-for"];
 190   }
 191
 192   return out;
 193 }
 194
 195 process.on("SIGINT", () => {
 196   console.info("Interrupted");
 197   process.exit(0);
 198 });