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import * as bodyParser from 'body-parser';
import { blue, yellow } from 'colors';
import * as cookieParser from 'cookie-parser';
import * as cors from "cors";
import * as express from 'express';
import * as session from 'express-session';
import * as expressValidator from 'express-validator';
import * as fs from 'fs';
import { Server as HttpServer } from "http";
import { createServer, Server as HttpsServer } from "https";
import * as passport from 'passport';
import * as request from 'request';
import * as webpack from 'webpack';
import * as wdm from 'webpack-dev-middleware';
import * as whm from 'webpack-hot-middleware';
import * as zlib from 'zlib';
import { publicDirectory } from '.';
import { logPort } from './ActionUtilities';
import { SSL } from './apis/google/CredentialsLoader';
import { getForgot, getLogin, getLogout, getReset, getSignup, postForgot, postLogin, postReset, postSignup } from './authentication/AuthenticationManager';
import { Database } from './database';
import RouteManager from './RouteManager';
import RouteSubscriber from './RouteSubscriber';
import { WebSocket } from './websocket';
import expressFlash = require('express-flash');
import flash = require('connect-flash');
const MongoStore = require('connect-mongo')(session);
const config = require('../../webpack.config');
const compiler = webpack(config);
/* RouteSetter is a wrapper around the server that prevents the server
from being exposed. */
export type RouteSetter = (server: RouteManager) => void;
export let disconnect: Function;
export let resolvedPorts: { server: number, socket: number } = { server: 1050, socket: 4321 };
export let resolvedServerUrl: string;
export default async function InitializeServer(routeSetter: RouteSetter) {
const isRelease = determineEnvironment();
const app = buildWithMiddleware(express());
// route table managed by express. routes are tested sequentially against each of these map rules. when a match is found, the handler is called to process the request
app.get(new RegExp(/^\/+$/), (req, res) => res.redirect(req.user ? "/home" : "/login")); // target urls that consist of one or more '/'s with nothing in between
app.use(express.static(publicDirectory, { setHeaders: res => res.setHeader("Access-Control-Allow-Origin", "*") })); //all urls that start with dash's public directory: /files/ (e.g., /files/images, /files/audio, etc)
app.use(cors({ origin: (_origin: any, callback: any) => callback(null, true) }));
app.use(wdm(compiler, { publicPath: config.output.publicPath }));
app.use(whm(compiler));
registerAuthenticationRoutes(app); // this adds routes to authenticate a user (login, etc)
registerCorsProxy(app); // this adds a /corsProxy/ route to allow clients to get to urls that would otherwise be blocked by cors policies
isRelease && !SSL.Loaded && SSL.exit();
routeSetter(new RouteManager(app, isRelease)); // this sets up all the regular supervised routes (things like /home, download/upload api's, pdf, search, session, etc)
registerEmbeddedBrowseRelativePathHandler(app); // this allows renered web pages which internally have relative paths to find their content
let server: HttpServer | HttpsServer;
isRelease && process.env.serverPort && (resolvedPorts.server = Number(process.env.serverPort));
await new Promise<void>(resolve => server = isRelease ?
createServer(SSL.Credentials, app).listen(resolvedPorts.server, resolve) :
app.listen(resolvedPorts.server, resolve)
);
logPort("server", resolvedPorts.server);
resolvedServerUrl = `${isRelease && process.env.serverName ? `https://${process.env.serverName}.com` : "http://localhost"}:${resolvedPorts.server}`;
// initialize the web socket (bidirectional communication: if a user changes
// a field on one client, that change must be broadcast to all other clients)
await WebSocket.initialize(isRelease, app);
disconnect = async () => new Promise<Error>(resolve => server.close(resolve));
return isRelease;
}
const week = 7 * 24 * 60 * 60 * 1000;
const secret = "64d6866242d3b5a5503c675b32c9605e4e90478e9b77bcf2bc";
function buildWithMiddleware(server: express.Express) {
[
cookieParser(),
session({
secret,
resave: true,
cookie: { maxAge: week },
saveUninitialized: true,
store: process.env.DB === "MEM" ? new session.MemoryStore() : new MongoStore({ url: Database.url })
}),
flash(),
expressFlash(),
bodyParser.json({ limit: "10mb" }),
bodyParser.urlencoded({ extended: true }),
expressValidator(),
passport.initialize(),
passport.session(),
(req: express.Request, res: express.Response, next: express.NextFunction) => {
res.locals.user = req.user;
if (req.method == 'GET') {
const period = 30000;
res.set('Cache-control', `public, max-age=${period}`)
} else {
// for the other requests set strict no caching parameters
res.set('Cache-control', `no-store`)
}
next();
}
].forEach(next => server.use(next));
return server;
}
/* Determine if the enviroment is dev mode or release mode. */
function determineEnvironment() {
const isRelease = process.env.RELEASE === "true";
const color = isRelease ? blue : yellow;
const label = isRelease ? "release" : "development";
console.log(`\nrunning server in ${color(label)} mode`);
// swilkins: I don't think we need to read from ClientUtils.RELEASE anymore. Should be able to invoke process.env.RELEASE
// on the client side, thanks to dotenv in webpack.config.js
let clientUtils = fs.readFileSync("./src/client/util/ClientUtils.ts.temp", "utf8");
clientUtils = `//AUTO-GENERATED FILE: DO NOT EDIT\n${clientUtils.replace('"mode"', String(isRelease))}`;
fs.writeFileSync("./src/client/util/ClientUtils.ts", clientUtils, "utf8");
return isRelease;
}
function registerAuthenticationRoutes(server: express.Express) {
server.get("/signup", getSignup);
server.post("/signup", postSignup);
server.get("/login", getLogin);
server.post("/login", postLogin);
server.get("/logout", getLogout);
server.get("/forgotPassword", getForgot);
server.post("/forgotPassword", postForgot);
const reset = new RouteSubscriber("resetPassword").add("token").build;
server.get(reset, getReset);
server.post(reset, postReset);
}
function registerCorsProxy(server: express.Express) {
server.use("/corsProxy", async (req, res) => {
const referer = req.headers.referer ? decodeURIComponent(req.headers.referer) : "";
let requrlraw = decodeURIComponent(req.url.substring(1));
const qsplit = requrlraw.split("?q=");
const newqsplit = requrlraw.split("&q=");
if (qsplit.length > 1 && newqsplit.length > 1) {
const lastq = newqsplit[newqsplit.length - 1];
requrlraw = qsplit[0] + "?q=" + lastq.split("&")[0] + "&" + qsplit[1].split("&")[1];
}
const requrl = requrlraw.startsWith("/") ? referer + requrlraw : requrlraw;
// cors weirdness here...
// if the referer is a cors page and the cors() route (I think) redirected to /corsProxy/<path> and the requested url path was relative,
// then we redirect again to the cors referer and just add the relative path.
if (!requrl.startsWith("http") && req.originalUrl.startsWith("/corsProxy") && referer?.includes("corsProxy")) {
res.redirect(referer + (referer.endsWith("/") ? "" : "/") + requrl);
} else {
proxyServe(req, requrl, res);
}
});
}
function proxyServe(req: any, requrl: string, response: any) {
const htmlBodyMemoryStream = new (require('memorystream'))();
req.headers.cookie = "";
req.pipe(request(requrl))
.on("error", (e: any) => console.log(`Malformed CORS url: ${requrl}`, e))
.on("end", () => {
var rewrittenHtmlBody: any = undefined;
req.pipe(request(requrl))
.on("response", (res: any) => {
const headers = Object.keys(res.headers);
const headerCharRegex = /[^\t\x20-\x7e\x80-\xff]/;
headers.forEach(headerName => {
const header = res.headers[headerName];
if (Array.isArray(header)) {
res.headers[headerName] = header.filter(h => !headerCharRegex.test(h));
} else if (headerCharRegex.test(header || "")) {
delete res.headers[headerName];
}
if (headerName === "content-encoding" && header.includes("gzip")) {
try {
const replacer = (match: any, href: string, offset: any, string: any) => {
return `href="${resolvedServerUrl + "/corsProxy/http" + href}"`;
};
const zipToStringDecoder = new (require('string_decoder').StringDecoder)('utf8');
// const htmlText = zipToStringDecoder.write(zlib.gunzipSync(htmlBodyMemoryStream.read()).toString('utf8')
// .replace('<head>', '<head> <style>[id ^= "google"] { display: none; } </style>')
// .replace(/href="http([^"]*)"/g, replacer)
// .replace(/target="_blank"/g, ""));
// rewrittenHtmlBody = zlib.gzipSync(htmlText);
const bodyStream = htmlBodyMemoryStream.read();
if (bodyStream) {
const htmlText = zipToStringDecoder.write(zlib.gunzipSync(bodyStream).toString('utf8')
.replace('<head>', '<head> <style>[id ^= "google"] { display: none; } </style>')
// .replace(/href="http([^"]*)"/g, replacer)
.replace(/target="_blank"/g, ""));
rewrittenHtmlBody = zlib.gzipSync(htmlText);
} else {
console.log("EMPTY body: href");
}
} catch (e) { console.log(e); }
}
});
})
.on('data', (e: any) => {
rewrittenHtmlBody && response.send(rewrittenHtmlBody);
rewrittenHtmlBody = undefined;
})
.pipe(response);
})
.pipe(htmlBodyMemoryStream);
}
function registerEmbeddedBrowseRelativePathHandler(server: express.Express) {
server.use("*", (req, res) => {
const relativeUrl = req.originalUrl;
if (!req.user) res.redirect("/home"); // When no user is logged in, we interpret a relative URL as being a reference to something they don't have access to and redirect to /home
else if (!res.headersSent && req.headers.referer?.includes("corsProxy")) { // a request for something by a proxied referrer means it must be a relative reference. So construct a proxied absolute reference here.
const proxiedRefererUrl = decodeURIComponent(req.headers.referer); // (e.g., http://localhost:<port>/corsProxy/https://en.wikipedia.org/wiki/Engelbart)
const dashServerUrl = proxiedRefererUrl.match(/.*corsProxy\//)![0]; // the dash server url (e.g.: http://localhost:<port>/corsProxy/ )
const actualReferUrl = proxiedRefererUrl.replace(dashServerUrl, ""); // the url of the referer without the proxy (e.g., : http:s//en.wikipedia.org/wiki/Engelbart)
const absoluteTargetBaseUrl = actualReferUrl.match(/http[s]?:\/\/[^\/]*/)![0]; // the base of the original url (e.g., https://en.wikipedia.org)
const redirectedProxiedUrl = dashServerUrl + encodeURIComponent(absoluteTargetBaseUrl + relativeUrl); // the new proxied full url (e..g, http://localhost:<port>/corsProxy/https://en.wikipedia.org/<somethingelse>)
res.redirect(redirectedProxiedUrl);
} else if (relativeUrl.startsWith("/search") && !req.headers.referer?.includes("corsProxy")) { // detect search query and use default search engine
res.redirect(req.headers.referer + "corsProxy/" + encodeURIComponent("http://www.google.com" + relativeUrl));
} else {
res.end();
}
});
}
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