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