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       return res.redirect(`/404?err=${errCode}`);
  94     }
  95
  96     let isoData: IsoData = {
  97       path: req.path,
  98       site_res: site,
  99       routeData,
 100     };
 101
 102     const wrapper = (
 103       <StaticRouter location={req.url} context={isoData}>
 104         <App siteRes={isoData.site_res} />
 105       </StaticRouter>
 106     );
 107     if (context.url) {
 108       return res.redirect(context.url);
 109     }
 110
 111     const cspHtml = (
 112       <meta
 113         http-equiv="Content-Security-Policy"
 114         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'"
 115       />
 116     );
 117
 118     const root = renderToString(wrapper);
 119     const symbols = renderToString(SYMBOLS);
 120     const cspStr = process.env.LEMMY_EXTERNAL_HOST
 121       ? renderToString(cspHtml)
 122       : "";
 123     const helmet = Helmet.renderStatic();
 124
 125     const config: ILemmyConfig = { wsHost: process.env.LEMMY_WS_HOST };
 126
 127     res.send(`
 128            <!DOCTYPE html>
 129            <html ${helmet.htmlAttributes.toString()} lang="en">
 130            <head>
 131            <script>window.isoData = ${serialize(isoData)}</script>
 132            <script>window.lemmyConfig = ${serialize(config)}</script>
 133
 134            <!-- A remote debugging utility for mobile
 135            <script src="//cdn.jsdelivr.net/npm/eruda"></script>
 136            <script>eruda.init();</script>
 137            -->
 138
 139            ${helmet.title.toString()}
 140            ${helmet.meta.toString()}
 141
 142            <!-- Required meta tags -->
 143            <meta name="Description" content="Lemmy">
 144            <meta charset="utf-8">
 145            <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
 146
 147            <!-- Content Security Policy -->
 148            ${cspStr}
 149
 150            <!-- Web app manifest -->
 151            <link rel="manifest" href="/static/assets/manifest.webmanifest">
 152
 153            <!-- Styles -->
 154            <link rel="stylesheet" type="text/css" href="/static/styles/styles.css" />
 155
 156            <!-- Current theme and more -->
 157            ${helmet.link.toString()}
 158
 159            <!-- Icons -->
 160            ${symbols}
 161
 162            </head>
 163
 164            <body ${helmet.bodyAttributes.toString()}>
 165              <noscript>
 166                <div class="alert alert-danger rounded-0" role="alert">
 167                  <b>Javascript is disabled. Actions will not work.</b>
 168                </div>
 169              </noscript>
 170
 171              <div id='root'>${root}</div>
 172              <script defer src='/static/js/client.js'></script>
 173            </body>
 174          </html>
 175 `);
 176   } catch (err) {
 177     console.log(err);
 178   }
 179 });
 180
 181 server.listen(Number(port), hostname, () => {
 182   console.log(`http://${hostname}:${port}`);
 183 });
 184
 185 function setForwardedHeaders(headers: IncomingHttpHeaders): {
 186   [key: string]: string;
 187 } {
 188   let out = {
 189     host: headers.host,
 190   };
 191   if (headers["x-real-ip"]) {
 192     out["x-real-ip"] = headers["x-real-ip"];
 193   }
 194   if (headers["x-forwarded-for"]) {
 195     out["x-forwarded-for"] = headers["x-forwarded-for"];
 196   }
 197
 198   return out;
 199 }
 200
 201 process.on("SIGINT", () => {
 202   console.info("Interrupted");
 203   process.exit(0);
 204 });