Typescript migration

* app.js
* main.js
* router.js

server/app.ts

@@ -0,0 +1,67 @@
+import _ from "lodash"
+import auth, {BasicAuthCheckerCallback} from "http-auth"
+import bodyParser from "body-parser"
+import compress from "compression"
+import express, {Express, NextFunction, Request, Response} from "express"
+import fs from "graceful-fs"
+
+const config = require('./config').config
+
+const app: Express = express();
+
+const router = express.Router();
+
+// urls beneath /internal are protected
+const internalAuth = auth.basic(
+    {
+        realm: 'Knotenformular - Intern'
+    },
+    function (username: string, password: string, callback: BasicAuthCheckerCallback): void {
+        callback(
+            config.server.internal.active &&
+            username === config.server.internal.user &&
+            password === config.server.internal.password
+        );
+    }
+);
+router.use('/internal', auth.connect(internalAuth));
+
+router.use(bodyParser.json());
+router.use(bodyParser.urlencoded({ extended: true }));
+
+const adminDir = __dirname + '/../admin';
+const clientDir = __dirname + '/../client';
+const templateDir = __dirname + '/templates';
+
+const jsTemplateFiles = [
+    '/config.js'
+];
+
+router.use(compress());
+
+function serveTemplate (mimeType: string, req: Request, res: Response, next: NextFunction): void {
+    return fs.readFile(templateDir + '/' + req.path + '.template', 'utf8', function (err, body) {
+        if (err) {
+            return next(err);
+        }
+
+        res.writeHead(200, { 'Content-Type': mimeType });
+        res.end(_.template(body)({ config: config.client }));
+
+        return null; // to suppress warning
+    });
+}
+
+router.use(function (req: Request, res: Response, next: NextFunction): void {
+    if (jsTemplateFiles.indexOf(req.path) >= 0) {
+        return serveTemplate('application/javascript', req, res, next);
+    }
+    return next();
+});
+
+router.use('/internal/admin', express.static(adminDir + '/'));
+router.use('/', express.static(clientDir + '/'));
+
+app.use(config.server.rootPath, router);
+
+export default app;