enigma-bbs/core/servers/content/web.js

260 lines
6.5 KiB
JavaScript

/* jslint node: true */
'use strict';
// ENiGMA½
const Log = require('../../logger.js').log;
const ServerModule = require('../../server_module.js').ServerModule;
const Config = require('../../config.js').config;
// deps
const http = require('http');
const https = require('https');
const _ = require('lodash');
const fs = require('graceful-fs');
const paths = require('path');
const mimeTypes = require('mime-types');
const ModuleInfo = exports.moduleInfo = {
name : 'Web',
desc : 'Web Server',
author : 'NuSkooler',
packageName : 'codes.l33t.enigma.web.server',
};
class Route {
constructor(route) {
Object.assign(this, route);
if(this.method) {
this.method = this.method.toUpperCase();
}
try {
this.pathRegExp = new RegExp(this.path);
} catch(e) {
Log.debug( { route : route }, 'Invalid regular expression for route path' );
}
}
isValid() {
return (
this.pathRegExp instanceof RegExp &&
( -1 !== [ 'GET', 'HEAD', 'POST', 'PUT', 'DELETE', 'CONNECT', 'OPTIONS', 'TRACE', ].indexOf(this.method) ) ||
!_.isFunction(this.handler)
);
}
matchesRequest(req) {
return req.method === this.method && this.pathRegExp.test(req.url);
}
getRouteKey() { return `${this.method}:${this.path}`; }
}
exports.getModule = class WebServerModule extends ServerModule {
constructor() {
super();
this.enableHttp = Config.contentServers.web.http.enabled || false;
this.enableHttps = Config.contentServers.web.https.enabled || false;
this.routes = {};
if(this.isEnabled() && Config.contentServers.web.staticRoot) {
this.addRoute({
method : 'GET',
path : '/static/.*$',
handler : this.routeStaticFile.bind(this),
});
}
}
buildUrl(pathAndQuery) {
//
// Create a URL such as
// https://l33t.codes:44512/ + |pathAndQuery|
//
// Prefer HTTPS over HTTP. Be explicit about the port
// only if non-standard. Allow users to override full prefix in config.
//
if(_.isString(Config.contentServers.web.overrideUrlPrefix)) {
return `${Config.contentServers.web.overrideUrlPrefix}${pathAndQuery}`;
}
let schema;
let port;
if(Config.contentServers.web.https.enabled) {
schema = 'https://';
port = (443 === Config.contentServers.web.https.port) ?
'' :
`:${Config.contentServers.web.https.port}`;
} else {
schema = 'http://';
port = (80 === Config.contentServers.web.http.port) ?
'' :
`:${Config.contentServers.web.http.port}`;
}
return `${schema}${Config.contentServers.web.domain}${port}${pathAndQuery}`;
}
isEnabled() {
return this.enableHttp || this.enableHttps;
}
createServer() {
if(this.enableHttp) {
this.httpServer = http.createServer( (req, resp) => this.routeRequest(req, resp) );
}
if(this.enableHttps) {
const options = {
cert : fs.readFileSync(Config.contentServers.web.https.certPem),
key : fs.readFileSync(Config.contentServers.web.https.keyPem),
};
// additional options
Object.assign(options, Config.contentServers.web.https.options || {} );
this.httpsServer = https.createServer(options, (req, resp) => this.routeRequest(req, resp) );
}
}
listen() {
let ok = true;
[ 'http', 'https' ].forEach(service => {
const name = `${service}Server`;
if(this[name]) {
const port = parseInt(Config.contentServers.web[service].port);
if(isNaN(port)) {
ok = false;
return Log.warn( { port : Config.contentServers.web[service].port, server : ModuleInfo.name }, `Invalid port (${service})` );
}
return this[name].listen(port);
}
});
return ok;
}
addRoute(route) {
route = new Route(route);
if(!route.isValid()) {
Log.warn( { route : route }, 'Cannot add route: missing or invalid required members' );
return false;
}
const routeKey = route.getRouteKey();
if(routeKey in this.routes) {
Log.warn( { route : route, routeKey : routeKey }, 'Cannot add route: duplicate method/path combination exists' );
return false;
}
this.routes[routeKey] = route;
return true;
}
routeRequest(req, resp) {
const route = _.find(this.routes, r => r.matchesRequest(req) );
if(!route && '/' === req.url) {
return this.routeIndex(req, resp);
}
return route ? route.handler(req, resp) : this.accessDenied(resp);
}
respondWithError(resp, code, bodyText, title) {
const customErrorPage = paths.join(Config.contentServers.web.staticRoot, `${code}.html`);
fs.readFile(customErrorPage, 'utf8', (err, data) => {
resp.writeHead(code, { 'Content-Type' : 'text/html' } );
if(err) {
return resp.end(`<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>${title}</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body>
<article>
<h2>${bodyText}</h2>
</article>
</body>
</html>`
);
}
return resp.end(data);
});
}
accessDenied(resp) {
return this.respondWithError(resp, 401, 'Access denied.', 'Access Denied');
}
fileNotFound(resp) {
return this.respondWithError(resp, 404, 'File not found.', 'File Not Found');
}
routeIndex(req, resp) {
const filePath = paths.join(Config.contentServers.web.staticRoot, 'index.html');
return this.returnStaticPage(filePath, resp);
}
routeStaticFile(req, resp) {
const fileName = req.url.substr(req.url.indexOf('/', 1));
const filePath = paths.join(Config.contentServers.web.staticRoot, fileName);
return this.returnStaticPage(filePath, resp);
}
returnStaticPage(filePath, resp) {
const self = this;
fs.stat(filePath, (err, stats) => {
if(err) {
return self.fileNotFound(resp);
}
const headers = {
'Content-Type' : mimeTypes.contentType(paths.basename(filePath)) || mimeTypes.contentType('.bin'),
'Content-Length' : stats.size,
};
const readStream = fs.createReadStream(filePath);
resp.writeHead(200, headers);
return readStream.pipe(resp);
});
}
routeTemplateFilePage(templatePath, preprocessCallback, resp) {
const self = this;
fs.readFile(templatePath, 'utf8', (err, templateData) => {
if(err) {
return self.fileNotFound(resp);
}
preprocessCallback(templateData, (err, finalPage, contentType) => {
if(err || !finalPage) {
return self.respondWithError(resp, 500, 'Internal Server Error.', 'Internal Server Error');
}
const headers = {
'Content-Type' : contentType || mimeTypes.contentType('.html'),
'Content-Length' : finalPage.length,
};
resp.writeHead(200, headers);
return resp.end(finalPage);
});
});
}
};