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(express.json());
  31 server.use(express.urlencoded({ extended: false }));
  32 server.use("/static", express.static(path.resolve("./dist")));
  33
  34 const robotstxt = `User-Agent: *
  35 Disallow: /login
  36 Disallow: /settings
  37 Disallow: /create_community
  38 Disallow: /create_post
  39 Disallow: /create_private_message
  40 Disallow: /inbox
  41 Disallow: /setup
  42 Disallow: /admin
  43 Disallow: /password_change
  44 Disallow: /search/
  45 `;
  46
  47 server.get("/robots.txt", async (_req, res) => {
  48   res.setHeader("content-type", "text/plain; charset=utf-8");
  49   res.send(robotstxt);
  50 });
  51
  52 server.get("/css/themes/:name", async (req, res) => {
  53   res.contentType("text/css");
  54   const theme = req.params.name;
  55   if (!theme.endsWith(".css")) {
  56     res.send("Theme must be a css file");
  57   }
  58
  59   const customTheme = path.resolve(`./${extraThemesFolder}/${theme}`);
  60   if (fs.existsSync(customTheme)) {
  61     res.sendFile(customTheme);
  62   } else {
  63     const internalTheme = path.resolve(`./dist/assets/css/themes/${theme}`);
  64     res.sendFile(internalTheme);
  65   }
  66 });
  67
  68 function buildThemeList(): string[] {
  69   let themes = [
  70     "litera",
  71     "materia",
  72     "minty",
  73     "solar",
  74     "united",
  75     "cyborg",
  76     "darkly",
  77     "journal",
  78     "sketchy",
  79     "vaporwave",
  80     "vaporwave-dark",
  81     "i386",
  82     "litely",
  83     "nord",
  84   ];
  85   if (fs.existsSync(extraThemesFolder)) {
  86     let dirThemes = fs.readdirSync(extraThemesFolder);
  87     let cssThemes = dirThemes
  88       .filter(d => d.endsWith(".css"))
  89       .map(d => d.replace(".css", ""));
  90     themes.push(...cssThemes);
  91   }
  92   return themes;
  93 }
  94
  95 server.get("/css/themelist", async (_req, res) => {
  96   res.type("json");
  97   res.send(JSON.stringify(buildThemeList()));
  98 });
  99
 100 // server.use(cookieParser());
 101 server.get("/*", async (req, res) => {
 102   try {
 103     const activeRoute = routes.find(route => matchPath(req.path, route)) || {};
 104     const context = {} as any;
 105     let auth: string = IsomorphicCookie.load("jwt", req);
 106
 107     let getSiteForm: GetSite = {};
 108     setOptionalAuth(getSiteForm, auth);
 109
 110     let promises: Promise<any>[] = [];
 111
 112     let headers = setForwardedHeaders(req.headers);
 113
 114     let initialFetchReq: InitialFetchRequest = {
 115       client: new LemmyHttp(httpBaseInternal, headers),
 116       auth,
 117       path: req.path,
 118     };
 119
 120     // Get site data first
 121     // This bypasses errors, so that the client can hit the error on its own,
 122     // in order to remove the jwt on the browser. Necessary for wrong jwts
 123     let try_site: any = await initialFetchReq.client.getSite(getSiteForm);
 124     if (try_site.error == "not_logged_in") {
 125       console.error(
 126         "Incorrect JWT token, skipping auth so frontend can remove jwt cookie"
 127       );
 128       delete getSiteForm.auth;
 129       delete initialFetchReq.auth;
 130       try_site = await initialFetchReq.client.getSite(getSiteForm);
 131     }
 132     let site: GetSiteResponse = try_site;
 133     initializeSite(site);
 134
 135     if (activeRoute.fetchInitialData) {
 136       promises.push(...activeRoute.fetchInitialData(initialFetchReq));
 137     }
 138
 139     let routeData = await Promise.all(promises);
 140
 141     // Redirect to the 404 if there's an API error
 142     if (routeData[0] && routeData[0].error) {
 143       let errCode = routeData[0].error;
 144       console.error(errCode);
 145       if (errCode == "instance_is_private") {
 146         return res.redirect(`/signup`);
 147       } else {
 148         return res.send(`404: ${removeAuthParam(errCode)}`);
 149       }
 150     }
 151
 152     let isoData: IsoData = {
 153       path: req.path,
 154       site_res: site,
 155       routeData,
 156     };
 157
 158     const wrapper = (
 159       <StaticRouter location={req.url} context={isoData}>
 160         <App siteRes={isoData.site_res} />
 161       </StaticRouter>
 162     );
 163     if (context.url) {
 164       return res.redirect(context.url);
 165     }
 166
 167     const cspHtml = (
 168       <meta
 169         http-equiv="Content-Security-Policy"
 170         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'"
 171       />
 172     );
 173
 174     const root = renderToString(wrapper);
 175     const symbols = renderToString(SYMBOLS);
 176     const cspStr = process.env.LEMMY_EXTERNAL_HOST
 177       ? renderToString(cspHtml)
 178       : "";
 179     const helmet = Helmet.renderStatic();
 180
 181     const config: ILemmyConfig = { wsHost: process.env.LEMMY_WS_HOST };
 182
 183     res.send(`
 184            <!DOCTYPE html>
 185            <html ${helmet.htmlAttributes.toString()} lang="en">
 186            <head>
 187            <script>window.isoData = ${serialize(isoData)}</script>
 188            <script>window.lemmyConfig = ${serialize(config)}</script>
 189
 190            <!-- A remote debugging utility for mobile
 191            <script src="//cdn.jsdelivr.net/npm/eruda"></script>
 192            <script>eruda.init();</script>
 193            -->
 194
 195            ${helmet.title.toString()}
 196            ${helmet.meta.toString()}
 197
 198            <!-- Required meta tags -->
 199            <meta name="Description" content="Lemmy">
 200            <meta charset="utf-8">
 201            <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
 202
 203            <!-- Content Security Policy -->
 204            ${cspStr}
 205
 206            <!-- Web app manifest -->
 207            <link rel="manifest" href="/static/assets/manifest.webmanifest">
 208
 209            <!-- Styles -->
 210            <link rel="stylesheet" type="text/css" href="/static/styles/styles.css" />
 211
 212            <!-- Current theme and more -->
 213            ${helmet.link.toString()}
 214
 215            <!-- Icons -->
 216            ${symbols}
 217
 218            </head>
 219
 220            <body ${helmet.bodyAttributes.toString()}>
 221              <noscript>
 222                <div class="alert alert-danger rounded-0" role="alert">
 223                  <b>Javascript is disabled. Actions will not work.</b>
 224                </div>
 225              </noscript>
 226
 227              <div id='root'>${root}</div>
 228              <script defer src='/static/js/client.js'></script>
 229            </body>
 230          </html>
 231 `);
 232   } catch (err) {
 233     console.error(err);
 234     return res.send(`404: ${removeAuthParam(err)}`);
 235   }
 236 });
 237
 238 server.listen(Number(port), hostname, () => {
 239   console.log(`http://${hostname}:${port}`);
 240 });
 241
 242 function setForwardedHeaders(headers: IncomingHttpHeaders): {
 243   [key: string]: string;
 244 } {
 245   let out = {
 246     host: headers.host,
 247   };
 248   if (headers["x-real-ip"]) {
 249     out["x-real-ip"] = headers["x-real-ip"];
 250   }
 251   if (headers["x-forwarded-for"]) {
 252     out["x-forwarded-for"] = headers["x-forwarded-for"];
 253   }
 254
 255   return out;
 256 }
 257
 258 process.on("SIGINT", () => {
 259   console.info("Interrupted");
 260   process.exit(0);
 261 });
 262
 263 function removeAuthParam(err: any): string {
 264   return removeParam(err.toString(), "auth");
 265 }
 266
 267 function removeParam(url: string, parameter: string): string {
 268   return url
 269     .replace(new RegExp("[?&]" + parameter + "=[^&#]*(#.*)?$"), "$1")
 270     .replace(new RegExp("([?&])" + parameter + "=[^&]*&"), "$1");
 271 }