mirror of
https://github.com/LemmyNet/lemmy-ui.git
synced 2024-12-11 13:31:27 +00:00
280 lines
8 KiB
TypeScript
280 lines
8 KiB
TypeScript
import { None, Option } from "@sniptt/monads";
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import { serialize as serializeO } from "class-transformer";
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import express from "express";
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import fs from "fs";
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import { IncomingHttpHeaders } from "http";
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import { Helmet } from "inferno-helmet";
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import { matchPath, StaticRouter } from "inferno-router";
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import { renderToString } from "inferno-server";
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import IsomorphicCookie from "isomorphic-cookie";
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import { GetSite, GetSiteResponse, LemmyHttp, toOption } from "lemmy-js-client";
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import path from "path";
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import process from "process";
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import serialize from "serialize-javascript";
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import { App } from "../shared/components/app/app";
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import { SYMBOLS } from "../shared/components/common/symbols";
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import { httpBaseInternal } from "../shared/env";
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import {
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ILemmyConfig,
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InitialFetchRequest,
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IsoData,
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} from "../shared/interfaces";
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import { routes } from "../shared/routes";
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import { initializeSite } from "../shared/utils";
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const server = express();
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const [hostname, port] = process.env["LEMMY_UI_HOST"]
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? process.env["LEMMY_UI_HOST"].split(":")
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: ["0.0.0.0", "1234"];
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const extraThemesFolder =
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process.env["LEMMY_UI_EXTRA_THEMES_FOLDER"] || "./extra_themes";
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if (!process.env["LEMMY_UI_DISABLE_CSP"] && !process.env["LEMMY_UI_DEBUG"]) {
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server.use(function (_req, res, next) {
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res.setHeader(
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"Content-Security-Policy",
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`default-src 'none'; connect-src *; img-src * data:; script-src 'self' 'unsafe-inline' 'unsafe-eval'; style-src 'self' 'unsafe-inline'; form-action 'self'; base-uri 'self'`
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);
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next();
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});
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}
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const customHtmlHeader = process.env["LEMMY_UI_CUSTOM_HTML_HEADER"] || "";
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server.use(express.json());
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server.use(express.urlencoded({ extended: false }));
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server.use("/static", express.static(path.resolve("./dist")));
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const robotstxt = `User-Agent: *
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Disallow: /login
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Disallow: /settings
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Disallow: /create_community
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Disallow: /create_post
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Disallow: /create_private_message
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Disallow: /inbox
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Disallow: /setup
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Disallow: /admin
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Disallow: /password_change
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Disallow: /search/
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`;
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server.get("/robots.txt", async (_req, res) => {
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res.setHeader("content-type", "text/plain; charset=utf-8");
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res.send(robotstxt);
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});
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server.get("/css/themes/:name", async (req, res) => {
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res.contentType("text/css");
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const theme = req.params.name;
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if (!theme.endsWith(".css")) {
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res.send("Theme must be a css file");
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}
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const customTheme = path.resolve(`./${extraThemesFolder}/${theme}`);
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if (fs.existsSync(customTheme)) {
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res.sendFile(customTheme);
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} else {
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const internalTheme = path.resolve(`./dist/assets/css/themes/${theme}`);
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res.sendFile(internalTheme);
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}
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});
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function buildThemeList(): string[] {
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let themes = [
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"litera",
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"materia",
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"minty",
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"solar",
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"united",
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"cyborg",
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"darkly",
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"darkly-red",
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"journal",
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"sketchy",
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"vaporwave",
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"vaporwave-dark",
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"i386",
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"litely",
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"litely-red",
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"nord",
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];
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if (fs.existsSync(extraThemesFolder)) {
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let dirThemes = fs.readdirSync(extraThemesFolder);
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let cssThemes = dirThemes
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.filter(d => d.endsWith(".css"))
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.map(d => d.replace(".css", ""));
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themes.push(...cssThemes);
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}
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return themes;
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}
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server.get("/css/themelist", async (_req, res) => {
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res.type("json");
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res.send(JSON.stringify(buildThemeList()));
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});
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// server.use(cookieParser());
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server.get("/*", async (req, res) => {
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try {
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const activeRoute = routes.find(route => matchPath(req.path, route)) || {};
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const context = {} as any;
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let auth: Option<string> = toOption(IsomorphicCookie.load("jwt", req));
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let getSiteForm = new GetSite({ auth });
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let promises: Promise<any>[] = [];
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let headers = setForwardedHeaders(req.headers);
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let initialFetchReq: InitialFetchRequest = {
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client: new LemmyHttp(httpBaseInternal, headers),
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auth,
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path: req.path,
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};
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// Get site data first
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// This bypasses errors, so that the client can hit the error on its own,
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// in order to remove the jwt on the browser. Necessary for wrong jwts
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let try_site: any = await initialFetchReq.client.getSite(getSiteForm);
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if (try_site.error == "not_logged_in") {
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console.error(
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"Incorrect JWT token, skipping auth so frontend can remove jwt cookie"
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);
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getSiteForm.auth = None;
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initialFetchReq.auth = None;
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try_site = await initialFetchReq.client.getSite(getSiteForm);
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}
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let site: GetSiteResponse = try_site;
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initializeSite(site);
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if (activeRoute.fetchInitialData) {
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promises.push(...activeRoute.fetchInitialData(initialFetchReq));
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}
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let routeData = await Promise.all(promises);
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// Redirect to the 404 if there's an API error
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if (routeData[0] && routeData[0].error) {
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let errCode = routeData[0].error;
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console.error(errCode);
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if (errCode == "instance_is_private") {
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return res.redirect(`/signup`);
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} else {
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return res.send(`404: ${removeAuthParam(errCode)}`);
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}
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}
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let isoData: IsoData = {
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path: req.path,
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site_res: site,
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routeData,
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};
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const wrapper = (
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<StaticRouter location={req.url} context={isoData}>
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<App />
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</StaticRouter>
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);
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if (context.url) {
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return res.redirect(context.url);
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}
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const eruda = (
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<>
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<script src="//cdn.jsdelivr.net/npm/eruda"></script>
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<script>eruda.init();</script>
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</>
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);
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const erudaStr = process.env["LEMMY_UI_DEBUG"] ? renderToString(eruda) : "";
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const root = renderToString(wrapper);
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const symbols = renderToString(SYMBOLS);
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const helmet = Helmet.renderStatic();
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const config: ILemmyConfig = { wsHost: process.env.LEMMY_UI_LEMMY_WS_HOST };
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res.send(`
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<!DOCTYPE html>
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<html ${helmet.htmlAttributes.toString()} lang="en">
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<head>
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<script>window.isoData = ${serializeO(isoData)}</script>
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<script>window.lemmyConfig = ${serialize(config)}</script>
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<!-- A remote debugging utility for mobile -->
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${erudaStr}
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<!-- Custom injected script -->
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${customHtmlHeader}
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${helmet.title.toString()}
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${helmet.meta.toString()}
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<!-- Required meta tags -->
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<meta name="Description" content="Lemmy">
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
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<!-- Web app manifest -->
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<link rel="manifest" href="/static/assets/manifest.webmanifest">
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<!-- Styles -->
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<link rel="stylesheet" type="text/css" href="/static/styles/styles.css" />
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<!-- Current theme and more -->
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${helmet.link.toString()}
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<!-- Icons -->
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${symbols}
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</head>
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<body ${helmet.bodyAttributes.toString()}>
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<noscript>
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<div class="alert alert-danger rounded-0" role="alert">
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<b>Javascript is disabled. Actions will not work.</b>
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</div>
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</noscript>
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<div id='root'>${root}</div>
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<script defer src='/static/js/client.js'></script>
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</body>
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</html>
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`);
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} catch (err) {
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console.error(err);
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return res.send(`404: ${removeAuthParam(err)}`);
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}
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});
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server.listen(Number(port), hostname, () => {
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console.log(`http://${hostname}:${port}`);
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});
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function setForwardedHeaders(headers: IncomingHttpHeaders): {
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[key: string]: string;
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} {
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let out = {
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host: headers.host,
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};
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if (headers["x-real-ip"]) {
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out["x-real-ip"] = headers["x-real-ip"];
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}
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if (headers["x-forwarded-for"]) {
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out["x-forwarded-for"] = headers["x-forwarded-for"];
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}
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return out;
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}
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process.on("SIGINT", () => {
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console.info("Interrupted");
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process.exit(0);
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});
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function removeAuthParam(err: any): string {
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return removeParam(err.toString(), "auth");
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}
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function removeParam(url: string, parameter: string): string {
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return url
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.replace(new RegExp("[?&]" + parameter + "=[^&#]*(#.*)?$"), "$1")
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.replace(new RegExp("([?&])" + parameter + "=[^&]*&"), "$1");
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}
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